1. The cutting and welding integrated equipment for the large-diameter stainless steel pipes is characterized by comprising two bottom plates (22), wherein a workbench (10) is fixedly arranged on one bottom plate (22) and both the two bottom plates (22), and a cutter (11) and a welding head (12) are arranged on the workbench (10); the upper end surfaces of the two bottom plates (22) are fixedly provided with hoisting tables (1), the upper ends of the two hoisting tables (1) are fixedly provided with mounting frames (13), the mounting frames (13) are respectively provided with a clamping mechanism, and the positions, corresponding to the clamping mechanisms, of the two bottom plates (22) are respectively and fixedly provided with vertical racks (4);

the clamping mechanism comprises a motor (3) and a rotary clamping tooth, the motor (3) is fixedly arranged on the mounting rack (13), the rotary clamping tooth comprises a transmission shaft (9), one end of the transmission shaft (9) is rotatably connected with the mounting rack (13), and the other end of the transmission shaft is fixedly provided with a main bevel gear (19) and is rotatably arranged in a clamping shell (18); the transmission shaft (9) is hollow and has a structure with a plurality of through grooves on the outer wall; a multi-edge pin block (16) is arranged in the transmission shaft (9) in a sliding mode, and the pin block (16) is connected with the mounting rack (13) through a spring (15); a third gear (14) is clamped in the pin block (16) in the initial state; the third gear (14) is meshed with the rack (4); a second limiting sleeve (14-1) is rotatably arranged on the side wall of the third gear (14), and the second limiting sleeve (14-1) is fixedly connected with the mounting rack (13) through a second limiting support (14-2); a push ring (16-1) is fixedly arranged at one end, far away from the spring (15), of the pin block (16), a second gear (5) is sleeved on the outer side of a transmission shaft (9) on the left side of the push ring (16-1), and the second gear (5) is meshed with a first gear (8) fixedly arranged on the motor (3); a first limiting sleeve (5-1) is rotatably arranged on the side wall of the second gear (5), the first limiting sleeve (5-1) is fixedly connected with the mounting frame (13) through a first limiting support (5-2), a traction sleeve (17) is arranged in the second gear (5) in a sliding mode, a traction circular plate (17-1) is arranged on the end face, close to the spring (15), of the traction sleeve (17), and the left end of the traction circular plate (17-1) is in contact with the right side face of the push ring (16-1); a plurality of traction columns (21) are symmetrically and fixedly arranged on the inner wall of the left end of the traction sleeve (17); the traction column (21) is connected with spiral sliding grooves (6-1) symmetrically formed in the first sleeve (6) in a clamping mode, the first sleeve (6) is fixedly arranged at the right end of the clamping shell (18), a plurality of secondary bevel gears (20) are arranged in the clamping shell (18) in a rotating mode through the second sleeve (20), the secondary bevel gears (20) are evenly distributed on the inner wall of the clamping shell (18) in an equal angle mode, the inner wall of each secondary bevel gear (20) is connected with a threaded column (7) in a threaded mode, and the threaded columns (7) are connected with the clamping shell (18) in a sliding mode.

2. The large-caliber stainless steel pipe cutting and welding integrated equipment as claimed in claim 1, wherein the equipment comprises: the surface of the workbench (10) is provided with an arc-shaped groove.

3. The large-caliber stainless steel pipe cutting and welding integrated equipment as claimed in claim 1, wherein the equipment comprises: the clamping shell (18) is a double-layer shell.

4. The large-caliber stainless steel pipe cutting and welding integrated equipment as claimed in claim 1, wherein the equipment comprises: the number of the spiral chutes (6-1) and the plurality of the traction columns (21) are multiple.

5. The integrated cutting and welding equipment for the large-caliber stainless steel pipes as claimed in claim 1, wherein the top end of the threaded column (7) in contact with the pipes is in the shape of a convex circular arc.

6. The large-caliber stainless steel pipe cutting and welding integrated equipment according to claim 1, wherein two bottom plates (22) are fixedly connected with a workbench (10), and the left side and the right side of the workbench (10) are in sliding connection with a sliding column (10-2-1) through positioning sliding chutes (10-1-1).

7. The integrated cutting and welding equipment for the large-caliber stainless steel pipes as claimed in claim 6, wherein the workbench (10) is divided into a left part and a right part which are connected in a sliding manner, and a lubricant is coated between the positioning chute (10-1-1) and the sliding column (10-2-1).

8. The cutting and welding integrated equipment for the large-caliber stainless steel pipes as claimed in claim 1, wherein the thread on the threaded column 7 is a triangular thread, wherein the number of teeth of the main bevel gear (19) is n1, the number of teeth of the secondary bevel gear (20) is n2, and the thread pitch of the threaded column (7) is λ; the third gear has a reference circle radius of:

r＝λ·n1/(2π×n2)。

Background

With the development of economy, the demand on the pipe is higher and higher in the national infrastructure; however, the existing positioning clamp is used for clamping the pipe from the outside basically, and the traditional clamp clamps the pipe through the clamping claws or the two clamping plates, so that the size of the clamp is large and the cost is high in order to cater to the pipes with different sizes.

Based on the technical scheme, the invention designs the large-caliber stainless steel pipe cutting and welding integrated equipment to solve the problems.

Disclosure of Invention

The invention aims to provide integrated equipment for cutting and welding large-caliber stainless steel pipes, which aims to solve the problem that the requirements for the pipes are higher and higher in the national infrastructure along with the development of economy in the background technology; however, the existing positioning clamp is used for clamping the pipe from the outside basically, and the traditional clamp clamps the pipe through the clamping claws or the two clamping plates, so that the size of the clamp is larger and the cost is high in order to cater to the pipes with different sizes.

In order to achieve the purpose, the invention provides the following technical scheme:

a cutting and welding integrated device for large-diameter stainless steel pipes comprises two bottom plates which are symmetrically arranged, wherein a roller is arranged on one of the two bottom plates, a workbench is fixedly arranged on each of the two bottom plates, and a cutter and a welding head are arranged on each workbench; the lifting device is characterized in that the upper end surfaces of the two bottom plates are fixedly provided with a lifting platform, the upper ends of the two lifting platforms are fixedly provided with a mounting frame, the mounting frame is provided with a clamping mechanism, and vertical racks are fixedly arranged on the two bottom plates at positions corresponding to the clamping mechanisms respectively;

the clamping mechanism comprises a motor and rotary clamping teeth, the motor is fixedly arranged on the mounting frame, the rotary clamping teeth comprise transmission shafts, one ends of the transmission shafts are rotatably connected with the mounting frame, and the other ends of the transmission shafts are fixedly provided with main bevel gears and are rotatably arranged in the clamping shell; the transmission shaft is hollow and has a structure with a plurality of through grooves on the outer wall; a multi-edge pin block is arranged in the transmission shaft in a sliding manner and is connected with the mounting rack through a spring; a third gear is clamped and connected with the pin block in an initial state; the third gear is meshed with the rack; a second limiting sleeve is rotatably arranged on the side wall of the third gear and is fixedly connected with the mounting frame through a second limiting support; a push ring is fixedly arranged at one end of the pin block, which is far away from the spring, a second gear is sleeved outside a transmission shaft on the left side of the push ring, and the second gear is meshed with a first gear fixedly arranged on the motor; a first limiting sleeve is rotatably arranged on the side wall of the second gear, the first limiting sleeve is fixedly connected with the mounting frame through a first limiting support, a traction sleeve is arranged in the second gear in a sliding mode, a traction circular plate is arranged on the end face, close to the spring, of the traction sleeve, and the left end of the traction circular plate is in contact with the right side face of the push ring; a plurality of traction columns are symmetrically and fixedly arranged on the inner wall of the left end of the traction sleeve; the traction column is clamped with sliding grooves symmetrically formed in a first sleeve, the first sleeve is fixedly arranged at the right end of the clamping shell, a plurality of secondary bevel gears are rotatably arranged in the clamping shell through a second sleeve, the secondary bevel gears are uniformly distributed on the inner wall of the clamping shell at equal angles, the inner wall of each secondary bevel gear is in threaded connection with a threaded column, and the threaded columns are in sliding connection with the clamping shell;

the thread on the threaded column is a triangular thread; (the triangular thread has self-locking property, namely the thread column can not cause radial displacement relative to the clamping shell due to end extrusion stress, thereby ensuring the stability of clamping).

The number of the main bevel gears is n1, the number of the secondary bevel gears is n2, and the thread pitch of the thread column is lambda; the third gear has a reference circle radius of: r ═ λ · n1/(2 π × n 2); (in fact, the axial rising height of the clamping shell is the same as (coaxial) the axial rising height of the third gear, taking one rotation of the third gear as an example, the axial rising height is 2 pi r, the radial displacement of the single threaded column relative to the axial is lambda.n 1/n2, when 2 pi r is lambda.n 1/n2, the axial rising can be ensured, but the distance between the lowest point of the rotation circle of the threaded column around the axial and the workbench is constant, so that the cutting and welding device can process the workpiece without adjustment.)

Two bottom plate fixedly connected with workstation, the workstation left and right sides is through location spout and traveller sliding connection.

In order to solve the problems that the prior positioning clamp for cutting and welding the pipe is basically used for clamping the pipe from the outside, and the traditional clamp clamps the pipe through the clamping claws or two clamping plates, so that the size of the clamp is larger and the cost is high in order to cater to the pipes with different sizes.

When the pipe clamping device is used, firstly, the workbench is stretched, a pipe to be processed is placed on the workbench, the positions of the clamps are adjusted (two ends of a steel pipe are sleeved on the telescopic heads of the two clamps), then, the cutter or the welding head is fixed to a proper position, the two hoisting tables are started simultaneously, the hoisting tables push the mounting frame fixedly connected with the hoisting tables to move upwards, the threaded columns are stretched along the radial direction of the clamping shell in the upward movement process of the mounting frame, and therefore the pipe clamping and lifting effects are achieved, and the specific movement process is as follows:

because the third gear is meshed with the rack, when the clamping mechanism moves upwards, the rack fixedly connected on the bottom plate can enable the third gear to rotate, because the third gear is connected with the pin block in a sliding manner, the pin block can drive the pin block to rotate, the pin block can drive the transmission shaft clamped with the pin block to rotate, because one end of the transmission shaft is connected with the mounting frame in a rotating manner, and the other end of the transmission shaft is fixedly connected with the main bevel gear, the transmission shaft can drive the main bevel gear to rotate synchronously, the main bevel gear can drive four secondary bevel gears meshed with the main bevel gear to rotate, the secondary bevel gears are connected with the second sleeve fixed on the clamping shell in a rotating manner, because the secondary bevel gears are in threaded connection with the threaded columns, the threaded columns can move outwards relative to the clamping shell, and then the pipe is clamped (in the process that the clamp rises, simultaneously, the four threaded columns can move relative to the clamping shell, wherein the threaded columns which vertically upwards push the inner wall of the pipe while rising along with the clamp, until the four threaded columns clamp the pipe, not only the clamping and lifting of the pipe are completed, but also the centering of the pipe is completed). When tubular product presss from both sides tight back, during cutting or welding, if need tubular product to rotate, only need open both sides motor simultaneously, can drive tubular product and rotate under the interference of handle rack and third gear, specific process is as follows:

the motor starts to rotate, the motor can drive the first gear to rotate (shown in figures three and five), the first gear drives the second gear which is meshed with the first gear to rotate, the second gear can drive the traction sleeve which is connected with the second gear in a sliding way to rotate, the traction sleeve can drive the traction column which is fixedly connected with the inner wall of the traction sleeve to rotate, the traction column is clamped with the first sleeve through the sliding groove, the traction column can move along the sliding groove to drive the traction sleeve to move, the traction circular plate at one end of the traction sleeve, which is close to the spring, is in contact with the surface of the push ring, the traction circular plate can drive the push ring to move, the push ring can drive the bayonet lock to move due to the fixed connection of the push ring and the pin block, the bayonet lock is disconnected with the third gear, the rotation of the third gear cannot influence the rotation of the transmission shaft any more (the rotation of the transmission shaft cannot occur under the action of the third gear and the rack due to the determined height before), the traction sleeve can move towards one end close to the pipe, and is finally connected with the second sleeve in a clamped mode, the gear can drive the second sleeve to rotate synchronously through the traction sleeve, the second sleeve and the clamping shell are fixedly connected, the clamping shell can also rotate synchronously along with the second sleeve, and then the pipe is driven to rotate, so that the processing of the steel pipe by the prop or the welding head can be completed conveniently. (when the workpiece is disassembled, the process and the workpiece are lifted up in a reciprocal process, briefly stated that the motor rotates reversely, the pin block is pulled back under the action of the spring so as to drive the linking sleeve to move leftwards along the spiral chute, the pin block is clamped in the third gear again to complete rotation synchronization, after the linking column reaches the initial position, the motor stops moving, and the workpiece can be completely returned to the initial position only by reducing the height of the hoisting platform.)

In the lifting process, the transmission shaft is clamped with the third gear through the pin block, so that the transmission shaft and the third gear synchronously rotate, the second gear and the motor are not moved, after the lifting process is finished, the pin block in the transmission shaft slides relative to the third gear along with the rotation of the motor, and after the pin block is completely separated from the third gear and the traction column is contacted with the bottom of the sliding groove, the transmission shaft and the second gear rotate relative to the third gear at the same angular speed; namely, the third gear only rotates in the ascending, moving and descending processes, and the transmission shaft rotates in the ascending process and the motor rotating process; the difference lies in that in the rising process, the transmission shaft rotates relative to the clamping shell, after the motor rotates, the transmission shaft does not rotate, and after the pin block is separated from being clamped with the third gear, the transmission shaft and the clamping shell rotate synchronously.

According to the invention, two ends of the pipe are sleeved outside the left and right symmetrical clamps, so that the clamps drive the pipe to lift, clamp and rotate, so that a worker can conveniently cut or weld the pipe, and the pipe with different calibers can be clamped, lifted and rotated. The clamp adopts an internal clamping mode, so a large amount of materials are saved, the clamp is provided with a telescopic device which can clamp pipes with different calibers, the clamping of the large-caliber pipe is not limited by the maximum caliber of the clamp any more, the workpiece is automatically lifted in the clamping process, and the rotary processing of the workpiece, which is required by welding and cutting, cannot be influenced; the pipe clamping and lifting device can clamp and lift a pipe synchronously and can automatically center, so that the labor intensity of workers is reduced, and the working efficiency is improved.

As a further scheme of the invention, the surface of the workbench is provided with an arc-shaped groove, so that the axis of the pipe can be parallel to the axis of the arc-shaped groove and can also be parallel to the axis of the clamping shell, and the pipe can be centered and clamped conveniently.

As a further aspect of the present invention, the clamping housing is a double-layer housing, and when the clamp is rotated, the threaded stud and the clamping housing have a certain interaction, so as to prevent the clamping housing from being damaged rapidly due to long-term use, and the double-layer housing can improve the durability of the clamp.

As a further scheme of the invention, the plurality of spiral chutes and the plurality of traction columns can reduce the stress of a single traction column, slow down the fatigue damage process of the traction column, and better improve the stability and the firmness of the traction sleeve during rotation, thereby prolonging the service life of the clamp.

As a further scheme of the invention, the top end of the threaded column, which is in contact with the pipe, is in a convex arc shape, the contact surface of the threaded column and the pipe is increased, and the surface is subjected to rough treatment, so that the friction force between the threaded column and the pipe is increased when the clamp works, the clamp can provide higher rotating speed for processing work, and the stability of the clamp during working is further ensured.

As a further scheme of the invention, the workbench is divided into a left part and a right part which are connected in a sliding manner, and a lubricant is coated between the positioning sliding chute and the sliding column, so that the workbench is more smoothly stretched, the noise is reduced, and the workbench can be prevented from being oxidized and corroded.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, two ends of the pipe are sleeved outside the left and right symmetrical clamps, so that the clamps drive the pipe to lift, clamp and rotate, so that a worker can conveniently cut or weld the pipe, and the pipe with different calibers can be clamped, lifted and rotated. Because the clamp adopts an internal clamping mode, a large amount of materials are saved, and the clamp is provided with a telescopic device which can clamp pipes with different calibers, and the clamping of the pipes with large calibers is not limited by the maximum calibers of the clamp any more. The workpiece is automatically lifted in the clamping process, and the rotating machining of the workpiece, which is required by welding and cutting, cannot be influenced; the pipe clamping and lifting device can clamp and lift a pipe synchronously and can automatically center, so that the labor intensity of workers is reduced, and the working efficiency is improved.

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the general construction of the front view of the present invention;

FIG. 2 is a cross-sectional view of an oblique view of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2 according to the present invention;

FIG. 4 is a cross-sectional view of a front view of the present invention;

FIG. 5 is a cross-sectional view of a portion of an elevation of the clamp of the present invention;

FIG. 6 is a quarter sectional view of a clamp of the present invention;

FIG. 7 is an enlarged view of B of FIG. 6 according to the present invention;

FIG. 8 is an enlarged view of C in FIG. 6 according to the present invention;

FIG. 9 is an enlarged view of D in FIG. 6 according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1-hoisting platform, 2-roller, 3-motor, 4-rack, 5-second gear, 5-1 first limiting sleeve, 5-2 first limiting support, 6-first sleeve, 6-1-spiral chute, 6-2-square groove, 7-threaded column, 8-first gear, 9-transmission shaft, 10-workbench, 10-1-chute, 10-2-1-sliding column, 11-cutter, 12-welding head, 13-mounting rack, 14-third gear, 14-1 second limiting sleeve, 14-2 second limiting support, 15-spring, 16-pin block, 16-1-push ring, 17-traction sleeve, 17-1-traction circular plate, 18-clamping shell, 19-main bevel gear, 20-secondary bevel gear, 20-1-second sleeve, 21-traction column and 22-bottom plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, the present invention provides a technical solution: a large-diameter stainless steel pipe cutting and welding integrated device comprises two bottom plates 22 which are symmetrically arranged, wherein a roller 2 is arranged on one bottom plate 22, a workbench 10 is fixedly arranged on each of the two bottom plates 22, and a cutter 11 and a welding head 12 are arranged on each workbench 10; the lifting device is characterized in that the upper end surfaces of the two bottom plates 22 are fixedly provided with lifting platforms 1, the upper ends of the two lifting platforms 1 are fixedly provided with mounting frames 13, the mounting frames 13 are provided with clamping mechanisms, and vertical racks 4 are fixedly arranged on the two bottom plates 22 at positions corresponding to the clamping mechanisms respectively;

the clamping mechanism comprises a motor 3 and rotary clamping teeth, the motor 3 is fixedly arranged on the mounting frame 13, the rotary clamping teeth comprise a transmission shaft 9, one end of the transmission shaft 9 is rotatably connected with the mounting frame 13, and the other end of the transmission shaft is fixedly provided with a main bevel gear 19 and is rotatably arranged in a clamping shell 18; the transmission shaft 9 is hollow and has a structure with a plurality of through grooves on the outer wall; a multi-edge pin block 16 is arranged in the transmission shaft 9 in a sliding mode, and the pin block 16 is connected with the mounting frame 13 through a spring 15; the pin block 16 is clamped with a third gear 14 in an initial state; the third gear 14 is meshed with the rack 4; a second limiting sleeve 14-1 is rotatably arranged on the side wall of the third gear 14, and the second limiting sleeve 14-1 is fixedly connected with the mounting frame 13 through a second limiting bracket 14-2; a push ring 16-1 is fixedly arranged at one end of the pin block 16 far away from the spring 15, a second gear 5 is sleeved outside a transmission shaft 9 on the left side of the push ring 16-1, and the second gear 5 is meshed with a first gear 8 fixedly arranged on the motor 3; a first limiting sleeve 5-1 is rotatably arranged on the side wall of the second gear 5, the first limiting sleeve 5-1 is fixedly connected with the mounting frame 13 through a first limiting support 5-2, a traction sleeve 17 is slidably arranged in the second gear 5, a traction circular plate 17-1 is arranged on the end face, close to the spring 15, of the traction sleeve 17, and the left end of the traction circular plate 17-1 is in contact with the right side face of the push ring 16-1; a plurality of traction columns 21 are symmetrically and fixedly arranged on the inner wall of the left end of the traction sleeve 17; the traction column 21 is clamped with sliding grooves symmetrically formed in the first sleeve 6, the first sleeve 6 is fixedly arranged at the right end of the clamping shell 18, a plurality of secondary bevel gears 20 are rotatably arranged in the clamping shell 18 through second sleeves 20, the secondary bevel gears 20 are uniformly distributed on the inner wall of the clamping shell 18 at equal angles, the inner wall of each secondary bevel gear 20 is in threaded connection with a threaded column 7, and the threaded column 7 is in sliding connection with the clamping shell 18;

the thread on the threaded column 7 is a triangular thread; the triangular thread has a self-locking property, i.e. the threaded stud is not displaced radially relative to the clamping housing 18 by the end compressive stress, so that the clamping stability is ensured.

The tooth number of the main bevel gear (19) is n1, the tooth number of the secondary bevel gear 20 is n2, and the thread pitch of the thread column is lambda; the pitch circle radius of the third gear 14 is: r ═ λ · n1/2 π × n 2; (in fact, the axial elevation of the clamping housing 18 is the same and coaxial as the axial elevation of the third gear 14, taking one revolution of the third gear 14 as an example, the axial elevation is 2 pi r, the radial displacement of the single threaded column 7 relative to the axial line is lambda-n 1/n2, and when 2 pi r is lambda-n 1/n2, the axial elevation can be ensured, but the distance between the lowest point of the circle of rotation of the threaded column 7 about the axial line and the worktable is constant, so that the cutting and welding device can process the workpiece without adjustment.)

The two bottom plates 22 are fixedly connected with a workbench 10, and the left side and the right side of the workbench 10 are in sliding connection with sliding columns 10-2-1 through positioning sliding grooves 10-1-1.

In order to solve the problems that the prior positioning clamp for cutting and welding the pipe is basically used for clamping the pipe from the outside, and the traditional clamp clamps the pipe through the clamping claws or two clamping plates, so that the size of the clamp is larger and the cost is high in order to cater to the pipes with different sizes.

When the pipe clamping device is used, firstly, the workbench 10 is stretched, a pipe to be processed is placed on the workbench 10, the position of the clamp is adjusted, two ends of a steel pipe are sleeved on the telescopic heads of the two clamps, then the cutter or the welding head 12 is fixed to a proper position, the two hoisting tables 1 are started simultaneously, the hoisting tables 1 push the mounting frames 13 fixedly connected with the hoisting tables to move upwards, the threaded columns 7 are opened along the radial direction of the clamping shell 18 in the upward movement process of the mounting frames 13, and therefore the pipe clamping and lifting effects are achieved, and the specific movement process is as follows:

because the third gear 14 is meshed with the rack 4, when the clamping mechanism moves upwards, the rack 4 fixedly connected to the bottom plate 22 can enable the third gear 14 to rotate, because the third gear 14 is slidably connected with the pin block 16, the pin block 16 can be driven to rotate by the rotation of the third gear 14, the transmission shaft 9 clamped with the pin block 16 can be driven to rotate by the pin block 16, because one end of the transmission shaft 9 is rotatably connected with the mounting frame 13 and the other end is fixedly connected with the main bevel gear 19, the transmission shaft 9 can drive the main bevel gear 19 to synchronously rotate, the main bevel gear 19 can drive the four secondary bevel gears 20 meshed with the main bevel gears to rotate, the secondary bevel gears 20 are rotatably connected with the second sleeve 20 fixed on the clamping shell 18, because the secondary bevel gears 20 are in threaded connection with the threaded column, the secondary bevel gears 20 can enable the threaded column 7 to move outwards relative to the clamping shell 18 by the rotation of the secondary bevel gears 20, and further in the process of lifting of the clamping pipe clamp, meanwhile, the four threaded columns 7 move relative to the clamping shell 18, wherein the threaded columns 7 which are vertically upward can lift along with the clamp and push the inner wall of the pipe upwards at the same time until the four threaded columns 7 clamp the pipe, so that not only is the clamping and lifting of the pipe completed, but also the centering of the pipe is completed. When tubular product presss from both sides tight back, during cutting or welding, if need tubular product to rotate, only need open both sides motor 3 simultaneously, can drive tubular product and rotate under handle rack 4 and third gear 14's interference, specific process is as follows:

when the motor 3 starts to rotate, the motor 3 drives the first gear 8 to rotate as shown in figures three and five, the first gear 8 rotates to drive the second gear 5 which is meshed with the first gear to rotate, the second gear 5 rotates to drive the traction sleeve 17 which is connected with the second gear in a sliding way to rotate, the traction sleeve 17 rotates to drive the traction column 21 which is fixedly connected with the inner wall of the traction column to rotate, the traction column 21 is clamped with the first sleeve 6 through a sliding groove, the traction column 21 rotates to move along the sliding groove and further drive the traction sleeve 17 to move, because the traction circular plate 17-1 at one end of the traction sleeve 17 close to the spring 15 is in surface contact with the push ring 16-1, the push ring 17-1 drives the push ring 16-1 to move, because the push ring 16-1 is fixedly connected with the pin block 16, the push ring 16-1 drives the bayonet lock to move, further the bayonet lock is disconnected with the third gear 14, and the rotation of the third gear 14 does not influence the height determination before the rotation of the third gear transmission shaft 9, so transmission shaft 9 can not take place to rotate under the effect of third gear 14 and rack 4, and it can remove to the one end that is close to tubular product to lead sleeve 17, finally with second sleeve 20 joint, the gear can drive second sleeve 20 synchronous rotation through leading sleeve 17, because second sleeve 20 is fixed connection with pressing from both sides tight shell 18, press from both sides tight shell 18 and also can follow second sleeve 20 synchronous rotation, and then drive the tubular product and rotate to be convenient for accomplish stage property or the processing of soldered connection 12 to the steel pipe. (when the workpiece is disassembled, the process and the workpiece are lifted in a mutually reverse process, briefly stated in the following, the motor 3 rotates reversely, the pin block 16 is pulled back under the action of the spring 15, so that the traction sleeve is driven to move leftwards along the spiral chute, the pin block 16 is clamped into the third gear 14 again to complete rotation synchronization, when the traction column 21 reaches the initial position, the motor 3 stops moving, and the workpiece can be completely returned to the initial position only by reducing the height of the lifting platform 1.)

In the ascending process, the transmission shaft 9 is contacted with the third gear clamp 14 through the pin block 16, so the transmission shaft 9 and the third gear 14 rotate synchronously, the second gear 5 and the motor 3 do not move, after the ascending process is finished, the pin block of the transmission shaft 9 slides relative to the third gear 14 along with the rotation of the motor 3, and after the pin block is completely separated from the third gear 14 and the connecting column 21 is contacted with the bottom of the chute, the transmission shaft 9 and the second gear 5 rotate relative to the third gear 14 at the same angular speed; that is, the third gear 14 only rotates during the ascending, descending and ascending processes, and the transmission shaft 9 rotates during the ascending process and the rotation process of the motor 3; the difference is that during the lifting process, the transmission shaft 9 rotates relative to the clamping shell 18, after the motor 3 rotates, the transmission shaft does not rotate, and after the pin block 16 is disengaged from the third gear 14, the transmission shaft 9 and the clamping shell 18 rotate synchronously.

According to the invention, two ends of the pipe are sleeved outside the left and right symmetrical clamps, so that the clamps drive the pipe to lift, clamp and rotate, so that a worker can conveniently cut or weld the pipe, and the pipe with different calibers can be clamped, lifted and rotated. Because the clamp adopts an internal clamping mode, a large amount of materials are saved, and the clamp is provided with a telescopic device which can clamp pipes with different calibers, and the clamping of the pipes with large calibers is not limited by the maximum calibers of the clamp any more. The pipe clamping and lifting device can clamp and lift a pipe synchronously and can automatically center, so that the labor intensity of workers is reduced, and the working efficiency is improved.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.