1. The utility model provides an anchor slab hole rough machining device with shockproof function is convenient for location centre gripping, a serial communication port, including equipment shell (1) and positioning mechanism (6), the inside lower wall of equipment shell (1) is provided with band conveyer (2), and has placed anchor slab body (3) in the upper end of band conveyer (2), the left and right sides of band conveyer (2) is connected with upset feed mechanism (4), be fixed with diaphragm (5) in the middle of the inside of equipment shell (1), and the lower extreme of diaphragm (5) is provided with positioning mechanism (6), positioning mechanism (6) include midblock (601), second cylinder (602), second electro-magnet (603), straight-bar (604), locating splint (605), third electro-magnet (606) and distance sensor (607), and install second cylinder (602) in the upper end of midblock (601), the midblock (601) all around from last to having set gradually second electro-magnet (603) and straight-bar (604) And the outside of the straight rod (604) is connected with a positioning clamp plate (605), one side of the positioning clamp plate (605), which is close to the middle block (601), is provided with a third electromagnet (606), and the upper end of the positioning clamp plate (605) is provided with a distance sensor (607) in a penetrating way.

2. The anchor plate hole rough machining device with the shockproof function and the convenient positioning and clamping function is characterized in that moving assemblies (7) are mounted on the left side and the right side of the inner upper wall of the equipment shell (1), an electric push rod (8) is connected to the lower end of each moving assembly (7), one side, close to the central axis of the equipment shell (1), of each electric push rod (8) is connected with a clamping assembly (10) through a connecting assembly (9), a lifting assembly (11) is arranged in the middle of the upper wall of the equipment shell (1), a threaded sleeve assembly (12) is connected to the outer portion of each lifting assembly (11), a drill bit (13) is connected to the lower end of each lifting assembly (11), and distance buffering assemblies (14) are arranged on the left side and the right side of each drill bit (13).

3. The rough machining device for the anchor plate hole with the shockproof function and the convenience for positioning and clamping is characterized in that the overturning and feeding mechanism (4) comprises a support frame (401), a first motor (402), a rotating rod (403), a first air cylinder (404), a dragging plate (405) and a first electromagnet (406), the first motor (402) is installed on one side of the support frame (401), the rotating rod (403) is connected to the other side of the support frame (401), the first air cylinder (404) is connected to the outer portion of the rotating rod (403), the dragging plate (405) is connected to the lower end of the first air cylinder (404), and the first electromagnet (406) is arranged in the direction, close to the central axis of the dragging plate (405), of the first air cylinder (404).

4. An anchor plate hole rough machining device with an anti-vibration function and convenient positioning and clamping functions as claimed in claim 2, wherein the moving assembly (7) comprises an electric sliding rail (701), a third air cylinder (702) and a mounting frame (703), the third air cylinder (702) is mounted at the lower end of the electric sliding rail (701), and the mounting frame (703) is arranged at the lower end of the third air cylinder (702).

5. The anchor plate hole rough machining device with the shockproof function and the convenience for positioning and clamping as claimed in claim 2, wherein the connecting assembly (9) comprises a movable block (901), a connecting buckle (902), a positioning rod (903), a fixture block (904) and a permanent magnet (905), the connecting buckle (902) is connected to the right side of the movable block (901), the positioning rod (903) is fixed to the outside of the movable block (901), the fixture block (904) is arranged on the outside of the positioning rod (903), and the permanent magnet (905) is embedded in the outside of the fixture block (904).

6. An anchor plate hole roughing device with shock absorbing function for facilitating positioning and clamping according to claim 2 characterized in that said clamping assembly (10) comprises a soft metal sheet (1001) and a rubber pad (1002), and a rubber pad (1002) is attached to one side of the soft metal sheet (1001).

7. An anchor plate hole rough machining device with an anti-vibration function and convenient positioning and clamping functions as claimed in claim 2, wherein the lifting assembly (11) comprises a connecting plate (1101), a second motor (1102), second guide rods (1103) and a threaded rod (1104), the second motor (1102) is installed at the upper end of the connecting plate (1101), the second guide rods (1103) are arranged on the left side and the right side of the connecting plate (1101), and the threaded rod (1104) is connected to the lower end of the connecting plate (1101).

8. An anchor plate hole rough machining device with an anti-vibration function and convenient positioning and clamping functions as claimed in claim 2, wherein the threaded sleeve assembly (12) comprises a half-threaded sleeve (1201), a third guide rod (1202), a first spring (1203) and a connecting block (1204), the third guide rod (1202) is connected to one side of the half-threaded sleeve (1201), the first spring (1203) is arranged outside the third guide rod (1202), and one end of the first spring (1203) is connected with the connecting block (1204).

9. An anchor plate hole rough machining device with an anti-vibration function and convenient positioning and clamping functions as claimed in claim 2, wherein the distance buffering assembly (14) comprises a sleeve rod (1401), a second spring (1402), a telescopic rod (1403) and a contact sensor (1404), the second spring (1402) is arranged inside the sleeve rod (1401), the telescopic rod (1403) is connected to the lower end of the second spring (1402), and the contact sensor (1404) is installed at the lower end of the telescopic rod (1403).

10. An anchor plate hole rough machining device with an anti-vibration function and convenient positioning and clamping functions as claimed in claim 9, wherein the telescopic rod (1403) is in an elastic structure with the sleeve rod (1401) through a second spring (1402), and the telescopic rod (1403) is connected with the contact sensor (1404) in an embedded mode.

Background

The anchor plate comprises a plate body and a mounting hole formed in the middle of the plate body, the plate body is of a flat plate structure, the shape of the plate body is a diamond shape, and the anchor plate hole is drilled by drilling equipment when rough machining is carried out on most equipment needing to be used, so that the anchor plate is drilled on the plate body.

The existing anchor plate hole rough machining device is mostly adjusted and positioned according to the manual work when being clamped, errors easily occur, and the anchor plate is in a staggered state when being conveyed, so that the equipment is not convenient to feed, and the machining of the equipment is influenced.

Therefore, the anchor plate hole rough machining device with the shockproof function and convenient for positioning and clamping needs to be designed aiming at the problems.

Disclosure of Invention

The invention aims to provide an anchor plate hole rough machining device with a shockproof function and convenience for positioning and clamping, and aims to solve the problems that most anchor plate hole rough machining devices in the background technology are adjusted and positioned manually during clamping, errors are prone to occurring, the anchor plates are in a staggered state during conveying, equipment is not convenient to feed, and equipment machining is affected.

In order to achieve the purpose, the invention provides the following technical scheme: an anchor plate hole rough machining device with a shockproof function and convenient positioning and clamping comprises an equipment shell and a positioning mechanism, wherein a belt conveyor is arranged on the inner lower wall of the equipment shell, and the upper end of the belt conveyor is provided with an anchor plate body, the left side and the right side of the belt conveyor are connected with a turnover feeding mechanism, the middle inside the equipment shell is fixed with a transverse plate, and the lower end of the transverse plate is provided with a positioning mechanism which comprises a middle block, a second cylinder, a second electromagnet, a straight rod, a positioning clamping plate, a third electromagnet and a distance sensor, and the upper end of the middle block is provided with a second cylinder, the periphery of the middle block is sequentially provided with a second electromagnet and a straight rod from top to bottom, and the external connection of straight-bar has the location splint, the third electro-magnet is installed to the one side that the location splint is close to the midblock, and the upper end of location splint runs through and installs distance sensor.

Preferably, the removal subassembly is installed to the inside upper wall left and right sides of equipment shell, and the lower extreme of removing the subassembly is connected with electric putter, one side that electric putter is close to equipment shell axis is connected with the centre gripping subassembly through coupling assembling, be provided with lifting unit in the middle of the upper wall of equipment shell, and lifting unit's external connection has the thread bush subassembly, lifting unit's lower extreme is connected with the drill bit, and the left and right sides of drill bit is provided with distance buffering subassembly.

Preferably, upset feed mechanism includes strut, first motor, dwang, first cylinder, planker and first electro-magnet, and installs first motor in one side of strut, the opposite side of strut is connected with the dwang, and the external connection of dwang has first cylinder, the lower extreme of first cylinder is connected with the planker, and the direction that first cylinder is close to the planker axis is provided with first electro-magnet.

Preferably, the moving assembly comprises an electric sliding rail, a third cylinder and a mounting frame, the third cylinder is mounted at the lower end of the electric sliding rail, and the mounting frame is arranged at the lower end of the third cylinder.

Preferably, coupling assembling includes movable block, connector link, locating lever, fixture block and permanent magnet, and the right side of movable block is connected with the connector link, the outside of movable block is fixed with the locating lever, and the outside of locating lever is provided with the fixture block, inlay in the outside of fixture block has the permanent magnet.

Preferably, the clamping assembly comprises a soft metal sheet and a rubber pad, and the rubber pad is connected to one side of the soft metal sheet.

Preferably, the lifting assembly comprises a connecting plate, a second motor, a second guide rod and a threaded rod, the second motor is installed at the upper end of the connecting plate, the second guide rod is arranged on the left side and the right side of the connecting plate, and the threaded rod is connected to the lower end of the connecting plate.

Preferably, the threaded sleeve assembly comprises a half threaded sleeve, a third guide rod, a first spring and a connecting block, one side of the half threaded sleeve is connected with the third guide rod, the first spring is arranged outside the third guide rod, and one end of the first spring is connected with the connecting block.

Preferably, the distance buffering assembly comprises a loop bar, a second spring, a telescopic rod and a contact sensor, the second spring is arranged inside the loop bar, the lower end of the second spring is connected with the telescopic rod, and the contact sensor is installed at the lower end of the telescopic rod.

Preferably, the telescopic rod forms an elastic structure with the loop bar through the second spring, and the telescopic rod is connected with the contact sensor in an embedded mode.

Compared with the prior art, the invention has the beneficial effects that: this equipment can carry out automatic positioning to the anchor slab, and equipment also can increase the stability of anchor slab simultaneously, reduces the anchor slab and adds the vibrations man-hour, and the electric putter is convenient for change to equipment, makes the electric putter of the different specifications of equipment demand use more, and equipment can make the drill bit constant voltage push down, prevents the too big damage drill bit of pressure, and the position of drill bit can be fixed a position to equipment to can slow down the speed that the drill bit descends, prevent that the drill bit from colliding with the anchor slab fast and damaging.

1. The positioning clamping plates are moved to clamp the anchor plate body through the heteropolar magnetism generated by the second electromagnet and the third electromagnet, the distance between each positioning clamping plate and the second cylinder can be detected through the distance sensor, the size of the anchor plate body can be calculated, and equipment can be conveniently machined.

2. The electric push rod can drive the clamping component to wrap the edge of the anchor plate body as much as possible through the connecting component, so that the clamping component can stably clamp the anchor plate body, the vibration of the anchor plate body can be reduced when the equipment drills, the equipment has a vibration prevention function, and the equipment can be accurately and stably processed.

3. The mounting frame is convenient for mounting and dismounting the electric push rod, and meanwhile, the permanent magnet can adsorb the front end of the electric push rod, so that the fixture block can clamp the front end of the electric push rod, the electric push rod and the connecting assembly are convenient to mount and dismount, the fixture block can be adjusted in a sliding mode at any position on the positioning rod, and the connecting assembly can be connected with electric push rods with different sizes.

4. When the drill bit is driven to press down, when the pressure borne by the drill bit is too high, the threaded rod rotates and can be dislocated with the half-thread sleeve, so that the half-thread sleeve contracts, the threaded rod can continuously rotate and cannot continuously pressurize the drill bit, the pressing pressure of the drill bit is constant, and the drill bit is prevented from being damaged due to the too high pressure.

5. The position of the contact sensor is lower than that of the drill bit, so that the drill bit can contact the anchor plate body in advance than the drill bit when descending, the rotating speed of the second motor can be controlled, and the damage caused by strong collision between the drill bit and the anchor plate body due to overlarge rotating speed of the second motor is prevented.

Drawings

FIG. 1 is a schematic front view of an anchor plate hole rough machining device with a shock-proof function and convenient positioning and clamping;

FIG. 2 is an enlarged schematic structural view of the anchor plate hole rough machining device with the shockproof function and the positioning and clamping convenience in the position A in FIG. 1;

FIG. 3 is an enlarged schematic structural view at B in FIG. 1 of the anchor plate hole rough machining device with the shockproof function and the positioning and clamping convenience of the invention;

FIG. 4 is an enlarged structural diagram of a cross section of a positioning mechanism of the anchor plate hole rough machining device with the shockproof function and the convenience in positioning and clamping;

FIG. 5 is an enlarged top view of the connecting assembly of the anchor plate hole roughing device with shock-absorbing function for facilitating positioning and clamping according to the present invention;

FIG. 6 is a schematic perspective view of a distance buffering assembly of the anchor plate hole rough machining device with shock-proof function and convenient positioning and clamping.

In the figure: 1. an equipment housing; 2. a belt conveyor; 3. an anchor plate body; 4. a material loading mechanism is turned over; 401. a support frame; 402. a first motor; 403. rotating the rod; 404. a first cylinder; 405. a carriage; 406. a first electromagnet; 5. a transverse plate; 6. a positioning mechanism; 601. a middle block; 602. a third cylinder; 603. a second electromagnet; 604. a straight rod; 605. positioning the clamping plate; 606. a third electromagnet; 607. a distance sensor; 7. a moving assembly; 701. an electric slide rail; 702. a second cylinder; 703. a mounting frame; 8. an electric push rod; 9. a connecting assembly; 901. a movable block; 902. a connecting buckle; 903. positioning a rod; 904. a clamping block; 905. a permanent magnet; 10. a clamping assembly; 1001. a soft metal sheet; 1002. a rubber pad; 11. a lifting assembly; 1101. a connecting plate; 1102. a second motor; 1103. a second guide bar; 1104. a threaded rod; 12. a threaded sleeve assembly; 1201. a half thread bush; 1202. a third guide bar; 1203. a first spring; 1204. connecting blocks; 13. a drill bit; 14. a distance buffering assembly; 1401. a loop bar; 1402. a second spring; 1403. a telescopic rod; 1404. a touch sensor.

Detailed Description

As shown in fig. 1 to 6, the present invention provides a technical solution: a rough machining device for an anchor plate hole with a shockproof function and convenience for positioning and clamping comprises an equipment shell 1 and a positioning mechanism 6, wherein a belt conveyor 2 is arranged on the lower wall inside the equipment shell 1, an anchor plate body 3 is placed at the upper end of the belt conveyor 2, the left side and the right side of the belt conveyor 2 are connected with an overturning feeding mechanism 4, a transverse plate 5 is fixed in the middle inside the equipment shell 1, the lower end of the transverse plate 5 is provided with the positioning mechanism 6, the positioning mechanism 6 comprises a middle block 601, a second cylinder 602, a second electromagnet 603, a straight rod 604, a positioning clamping plate 605, a third electromagnet 606 and a distance sensor 607, the second cylinder 602 is installed at the upper end of the middle block 601, the second electromagnet 603 and the straight rod 604 are sequentially arranged on the periphery of the middle block 601 from top to bottom, the positioning clamping plate 605 is connected with the outside of the straight rod 604, the third electromagnet 606 is installed on one side, close to the middle block 601, of the positioning clamping plate 605, a distance sensor 607 penetrates through the upper end of the positioning clamp plate 605, moving assemblies 7 are mounted on the left side and the right side of the inner upper wall of the equipment shell 1, the lower end of each moving assembly 7 is connected with an electric push rod 8, one side, close to the central axis of the equipment shell 1, of each electric push rod 8 is connected with a clamping assembly 10 through a connecting assembly 9, a lifting assembly 11 is arranged in the middle of the upper wall of the equipment shell 1, a threaded sleeve assembly 12 is connected to the outer part of the lifting assembly 11, a drill bit 13 is connected to the lower end of the lifting assembly 11, and distance buffering assemblies 14 are arranged on the left side and the right side of the drill bit 13;

the operation is as follows, the equipment shell 1 is the main structure of the equipment and mainly supports and protects the equipment, the belt conveyor 2 can convey the anchor plate body 3, the overturning feeding mechanism 4 can move the anchor plate body 3 to a processing position for processing, the transverse plate 5 mainly has the effect of supporting the positioning mechanism 6, heteropolar magnetism is generated through the second electromagnet 603 and the third electromagnet 606, so that the positioning clamp plate 605 moves to clamp the anchor plate body 3, the distance between each positioning clamp plate 605 and the second cylinder 602 can be detected through the distance sensor 607, so that the size of the anchor plate body 3 can be calculated, the equipment can be conveniently processed, meanwhile, the second electromagnet 603 and the third electromagnet 606 can adjust magnetic force according to the distance between the middle block 601 and the positioning clamp plate 605, so that the positioning clamp plate 605 drives the anchor plate body 3 to move, and the central axis of the anchor plate body 3 can coincide with the central axis of the middle block 601, thereby fix a position anchor slab body 3, electric putter 8 can drive centre gripping subassembly 10 through coupling assembling 9 and wrap up as far as the edge of anchor slab body 3, thereby can make centre gripping subassembly 10 can carry out stable centre gripping to anchor slab body 3, make equipment can reduce the vibrations of anchor slab body 3 when drilling, thereby make equipment have shockproof function, make equipment can accurate stable processing, removal subassembly 7 and the cooperation of electric putter 8 can make the work piece carry out all around movement, coupling assembling 9 can be connected centre gripping subassembly 10 and electric putter 8, lifting unit 11 and the cooperation of thread bush subassembly 12 can control drill bit 13 and go up and down, distance buffering subassembly 14 has the protection effect to drill bit 13.

As shown in fig. 1, the turnover feeding mechanism 4 includes a supporting frame 401, a first motor 402, a rotating rod 403, a first air cylinder 404, a carriage 405 and a first electromagnet 406, the first motor 402 is installed on one side of the supporting frame 401, the rotating rod 403 is connected to the other side of the supporting frame 401, the first air cylinder 404 is connected to the outside of the rotating rod 403, the carriage 405 is connected to the lower end of the first air cylinder 404, and the first electromagnet 406 is installed in the first air cylinder 404 in the direction close to the central axis of the carriage 405;

the rotating rod 403 is driven to rotate by the first motor 402, so that the carriage 405 faces downwards, the first cylinder 404 drives the carriage 405 to contact with the anchor plate body 3 and then to be adsorbed by the first electromagnet 406, then the first cylinder 404 rises back, and the rotating rod 403 continues to rotate to turn over the anchor plate body 3.

As shown in fig. 1, the moving assembly 7 includes a motor-driven sliding rail 701, a third cylinder 702 and a mounting bracket 703, the third cylinder 702 is installed at the lower end of the motor-driven sliding rail 701, and the mounting bracket 703 is installed at the lower end of the third cylinder 702;

the third cylinder 702 drives the mounting rack 703 to ascend and descend, the height of the clamping component 10 can be controlled, and the electric slide rail 701 can drive the third cylinder 702 to move back and forth, so that the front position and the rear position of the clamping component 10 are controlled.

As shown in fig. 5, the connection assembly 9 includes a movable block 901, a connection buckle 902, a positioning rod 903, a fixture block 904 and a permanent magnet 905, the connection buckle 902 is connected to the right side of the movable block 901, the positioning rod 903 is fixed outside the movable block 901, the fixture block 904 is arranged outside the positioning rod 903, and the permanent magnet 905 is embedded outside the fixture block 904;

permanent magnet 905 can adsorb electric putter 8's front end to make fixture block 904 carry out the joint to electric putter 8's front end, thereby make be convenient for install and dismantle between electric putter 8 and the coupling assembling 9, fixture block 904 can slide the regulation in the optional position on locating lever 903, thereby can make coupling assembling 9 connect not equidimension electric putter 8, buckle for swing joint be convenient for soft sheetmetal 1001 between movable block 901 and the connector link 902.

As shown in fig. 5, the clamping assembly 10 includes a soft metal sheet 1001 and a rubber pad 1002, and the rubber pad 1002 is attached to one side of the soft metal sheet 1001;

the soft metal sheet 1001 and the rubber pad 1002 can wrap and clamp the anchor plate body 3, thereby fixing the anchor plate body 3.

As shown in fig. 1, the lifting assembly 11 includes a connection plate 1101, a second motor 1102, second guide rods 1103 and a threaded rod 1104, the second motor 1102 is installed at the upper end of the connection plate 1101, the second guide rods 1103 are installed at the left and right sides of the connection plate 1101, and the threaded rod 1104 is connected to the lower end of the connection plate 1101;

the second motor 1102 is opened to drive the threaded rod 1104 to rotate, the drill bit 13 descends to work through threaded connection between the threaded rod 1104 and the threaded sleeve assembly 12, and the second motor 1102 can be limited to ascend and descend by the aid of a sliding structure formed by the connecting plate 1101 between the second guide rod 1103 and the equipment shell 1.

As shown in fig. 2, the threaded sleeve assembly 12 includes a half-threaded sleeve 1201, a third guide rod 1202, a first spring 1203 and a connecting block 1204, the third guide rod 1202 is connected to one side of the half-threaded sleeve 1201, the first spring 1203 is arranged outside the third guide rod 1202, and one end of the first spring 1203 is connected with the connecting block 1204;

when the pressure born by the drill bit 13 is too large, the threaded rod 1104 rotates and can be dislocated with the half thread sleeve 1201, so that the half thread sleeve 1201 contracts, the threaded rod 1104 can continuously rotate and simultaneously can not continuously pressurize the drill bit 13, the pressure for pressing down the drill bit 13 is constant, the drill bit 13 is prevented from being damaged due to the too large pressure, the half thread sleeve 1201 can automatically reset by the aid of an elastic telescopic structure formed by the half thread sleeve 1201 through the third guide rod 1202 and the first spring 1203 and the connecting block 1204, and the continuous operation of equipment is facilitated.

As shown in fig. 3, the distance buffering assembly 14 comprises a sleeve rod 1401, a second spring 1402, an expansion link 1403 and a contact sensor 1404, wherein the second spring 1402 is arranged inside the sleeve rod 1401, the expansion link 1403 is connected to the lower end of the second spring 1402, the contact sensor 1404 is installed on the lower end of the expansion link 1403, the expansion link 1403 forms an elastic structure with the sleeve rod 1401 through the second spring 1402, and the expansion link 1403 is connected with the contact sensor 1404 in an embedded manner;

when the contact sensor 1404 is in contact with the anchor plate body 3, the second motor 1102 can reduce the rotating speed, so that the drill bit 13 slowly descends, and the telescopic link 1403 can enable the telescopic link 1403 not to influence the descending of the drill bit 13 through the telescopic structure formed between the second spring 1402 and the sleeve rod 1401.

The working principle is as follows: firstly, the electric push rod 8 is installed and fixed through the installation frame 703, then the head of the electric push rod 8 is inserted into the connecting assembly 9, the permanent magnet 905 can adsorb the front end of the electric push rod 8, so that the fixture block 904 can clamp the front end of the electric push rod 8, so that the electric push rod 8 is connected with the connecting assembly 9, the anchor plate body 3 is conveyed through the belt conveyor 2, then the middle block 601 is driven to descend to a specified position through the second cylinder 602, heteropolar magnetism is generated through the second electromagnet 603 and the third electromagnet 606, so that the positioning clamp plate 605 moves to clamp the anchor plate body 3, the distance between each positioning clamp plate 605 and the second cylinder 602 can be detected through the distance sensor 607, the size of the anchor plate body 3 can be calculated, the equipment processing is convenient, and meanwhile, the magnetic force can be adjusted according to the distance between the middle block 601 and the positioning clamp plate 605 through the second electromagnet 603 and the third electromagnet 606, the positioning clamp plate 605 drives the anchor plate body 3 to move, the central axis of the anchor plate body 3 can coincide with the central axis of the middle block 601, then the positioning mechanism 6 is lifted back, the belt conveyor 2 continues to convey the anchor plate body 3, then the first motor 402 drives the rotating rod 403 to rotate, the dragging plate 405 is downward, then the first cylinder 404 drives the dragging plate 405 to contact with the anchor plate body 3 and then be adsorbed by the first electromagnet 406, then the first cylinder 404 is lifted back, the rotating rod 403 continues to rotate to turn the anchor plate body 3 to the upper surface, the second cylinder 702 drives the mounting rack 703 to lift, so that the clamping assembly 10 and the anchor plate body 3 are at the same height, the electric push rod 8 works, so that the soft metal sheet 1001 and the rubber pad 1002 wrap and clamp the anchor plate body 3, the movable block 901 is movably connected with the connecting buckle 902 to facilitate the bending of the soft metal sheet 1001, the position of the anchor plate body 3 can be adjusted by adjusting the extension length of the electric push rods 8 at the two ends and the electric slide rail 701, then the second motor 1102 is turned on to drive the threaded rod 1104 to rotate, the drill bit 13 is lowered to work through the threaded connection between the threaded rod 1104 and the threaded sleeve assembly 12, when the contact sensor 1404 is in contact with the anchor plate body 3, the second motor 1102 can reduce the rotating speed to slowly lower the drill bit 13, the telescopic link 1403 can ensure that the telescopic link 1403 does not influence the descending of the drill bit 13 through the telescopic structure formed between the second spring 1402 and the sleeve rod 1401, rotation of the threaded shaft 1104, when subjected to excessive pressure by the drill bit 13, will misalign with the half-shell 1201, allowing the half-shell 1201 to contract, so that the drill bit 13 is not further pressurized while the threaded rod 1104 continues to rotate, and the pressure for pressing down the drill bit 13 is constant, thereby preventing the drill bit 13 from being damaged by excessive pressure.