1. A clamp for a scraping and impact combined rock breaking test mainly comprises a clamp main body (1), a bearing (10), an inner hexagon bolt (11), PDC teeth (12) and a hobbing clamp (13); the fixture main body (1) consists of a clamp handle (2), a PDC tooth mounting groove (3), a hobbing fixture mounting groove (4), a bearing mounting hole (5), a countersunk head threaded hole (6), an adjusting cushion block (7) and a bolt (9); the hobbing clamp (13) consists of a hobbing clamp matrix (14), a clamping sleeve (17), hard alloy teeth (16), a threaded rod (18) and an adjusting nut (15); the clamping sleeve (17) consists of a hexagonal chuck (21) and a hard alloy tooth clamping hole (22); the hobbing clamp matrix (14) consists of a hobbing clamp mounting hole (19) and a threaded through hole (20); the clamping sleeve (17) consists of a hexagonal chuck (21) and a hard alloy tooth clamping hole (22); threaded rod (18) the face of cylinder of hobbing clamp (13) both sides and bearing (10) interference fit install in hobbing clamp mounting groove (4) on anchor clamps main part (1), hexagon socket head cap screw (11) through with the countersunk head screw hole (6) screw-thread fit of PDC tooth mounting groove (3) both sides wall, with PDC tooth (12) installation fix in PDC tooth mounting groove (3) on anchor clamps main part (1).

2. The clamp for the scraping and impact combined rock breaking test as claimed in claim 1, wherein: the angle cushion block (7) is arranged between the PDC teeth (12) and the bottom of the PDC tooth mounting groove (5) through a bolt (9), and meanwhile, adjusting nuts (15) are arranged on two sides of a hobbing clamp matrix (14) on the threaded rod (18) to realize that the angle and displacement parameters of rock acted by the teeth are adjustable; the cylindrical external thread at the bottom of the clamping sleeve (17) is in threaded fit connection with the threaded hole at the bottom of the clamping sleeve mounting hole (19), the outer surface of the middle cone of the clamping sleeve (17) is in molded fit with the surface of the conical hole of the clamping sleeve mounting hole (19), the hexagonal chuck (21) at the top of the clamping sleeve (17) is rotated, and the axial distance of the clamping sleeve (17) in the clamping sleeve mounting hole (19) can be adjusted.

3. The clamp for the scraping and impact combined rock breaking test as claimed in claim 1, wherein: the hard alloy teeth (16) are clamped by the clamping sleeve (17) and uniformly arranged on the cylindrical surface of the hobbing clamp matrix (14), the hobbing clamp matrix (14) rotates to drive the hard alloy teeth (16) to rotate to act on rocks, and the rotary impact effect of the hard alloy teeth (16) on the rocks is realized.

Background

China is a country with large energy demand, but oil and gas resources depend on imports in a large amount, the external dependence is high, in order to guarantee the energy safety of China, the exploration and development strength of the oil and gas resources of China must be increased, and one of the important factors restricting the oil and gas development is the rock breaking efficiency of a drill bit. In order to improve the oil and gas exploitation efficiency and reduce the drilling cost, researchers are constantly researching and developing composite drill bits with higher rock breaking efficiency, wherein the rock breaking mechanism and the structural design of the composite drill bits combining the PDC teeth and the hard alloy teeth are hot points of research.

The research of researchers mainly stays in the aspect of single rock breaking action mechanism of PDC tooth scraping and cutting or hard alloy tooth impact, and lacks the research on the rock breaking mechanism of scraping and cutting and impact combined action, so that a clamp for scraping and cutting and impact combined rock breaking test is urgently needed to develop a corresponding combined rock breaking test, and a theoretical basis is provided for the rock breaking mechanism and structural parameter design of a scraping and cutting and impact combined rock breaking drill bit.

The clamp for the scraping and impact combined rock breaking experiment can realize multi-parameter adjustability, meet the requirements of various test parameters, realize the reutilization of the clamp and reduce the test cost; adopt detachable tooth centre gripping mode simultaneously, realize trading tooth convenient and fast, reduce experimental preparation time, improved test efficiency.

Disclosure of Invention

The purpose of the invention is as follows: the clamp for the scraping and impact combined rock breaking test is adjustable in multiple parameters and convenient and quick in tooth replacement.

The invention adopts the following technical scheme:

the invention relates to a clamp for a scraping and impact combined rock breaking test, which mainly comprises a clamp main body, a bearing, an inner hexagon bolt, PDC teeth and a hobbing clamp.

The fixture main body comprises a clamp handle, a PDC tooth mounting groove, a hobbing fixture mounting groove, a bearing mounting hole, a countersunk head threaded hole, an angle cushion block and a bolt. The whole clamp body is in a cuboid shape, and the top of the clamp body is a cylindrical clamp handle; the front end of the clamp main body is provided with a PDC tooth installation groove, countersunk head threaded holes formed in two side walls of the PDC tooth installation groove are matched with the hexagon socket head cap bolts, the PDC teeth are fixed in the PDC tooth installation groove, threaded holes are formed in the bottom of the PDC tooth installation groove, and the threaded holes are matched and connected with the bolts to fix the angle cushion block between the PDC teeth and the bottom surface of the PDC tooth installation groove; the rear end of the clamp main body is provided with a hobbing clamp mounting groove, and two side walls of the hobbing clamp mounting groove are provided with bearing holes.

The hobbing clamp comprises a hobbing clamp matrix, six clamping sleeves, six hard alloy teeth, a threaded rod and two adjusting nuts.

The two ends of the threaded rod are cylinders, the middle of the threaded rod is provided with a section of cylindrical external thread, and cylindrical surfaces at the two ends of the threaded rod are connected with bearing inner holes on the two sides of the hobbing fixture mounting groove in an interference fit mode.

The hobbing clamp matrix is integrally cylindrical, and a threaded through hole is formed in the direction vertical to the end face by taking the center of the end face of the hobbing clamp matrix as the center; six clamping sleeve mounting holes which are uniformly spaced are formed in the cylindrical surface of the hobbing clamp matrix, the hole surface is a conical surface, and cylindrical threaded holes are formed in the bottoms of the clamping sleeve mounting holes. The cylindrical external thread in the middle of the threaded rod is matched and connected with the threaded through hole in the hobbing clamp matrix, and two adjusting nuts are respectively arranged on two sides of the hobbing clamp matrix on the threaded rod.

The clamping sleeve consists of a hexagonal chuck and a hard alloy tooth clamping hole; the center inside the clamping sleeve is provided with a hard alloy tooth clamping hole, the bottom of the clamping sleeve is provided with a cylindrical external thread which is matched and connected with a threaded hole at the bottom of a clamping sleeve mounting hole on the circumference of the hobbing clamp body; the middle part of the clamping sleeve is a cone with the inner diameter of the cylindrical external thread at the bottom as the initial diameter and the outer diameter gradually increased, and the outer surface of the cone is matched with the inner conical hole surface of the mounting hole of the clamping sleeve; the hexagonal chuck of clamping sleeve top for six cylinders, and start from the hexagonal chuck terminal surface at clamping sleeve top, along the axial with the vertical even interval cutting of hexagonal chuck and cone for six parts, until cylinder external screw thread initiating department.

The invention has the advantages that:

1: the tooth replacement is convenient to disassemble, and the tooth replacement efficiency is high;

2: multiple parameters are adjustable, the same clamp can be repeatedly used, and the test cost is reduced;

3: the design of the circumferential surface rotary clamping structure of the hard alloy teeth realizes the rotary impact on rocks, and has the advantages of short action time, high frequency and high test efficiency.

Drawings

FIG. 1 is an overall schematic view of the clamp for the scraping and impact combined rock breaking test;

FIG. 2 is a schematic view of the clamp body;

FIG. 3 is a schematic view of the angle block;

FIG. 4 is a schematic view of the hobbing fixture;

FIG. 5 is a schematic view of the hobbing fixture carcass;

FIG. 6 is a schematic view of the clamping sleeve;

in the figure: 1. a clamp body; 2. a clamp handle; 3, mounting a PDC tooth groove; 4. a hobbing clamp mounting groove; 5. a bearing mounting hole; 6. countersunk threaded holes; 7. an angle cushion block; 8 through holes; 9. a bolt; 10. a bearing; 11. a hexagon socket head cap screw; 12, PDC teeth; 13. a hobbing clamp; 14 hobbing a clamp carcass; 15. adjusting the nut; 16. hard alloy teeth; 17. a clamping sleeve; 18. a threaded rod; 19. a clamping sleeve mounting hole; 20. a threaded through hole; 21. a hexagonal chuck; 22. a hard alloy tooth clamping hole;

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in fig. 1, the clamp for the scraping and impact combined rock breaking test mainly comprises a clamp main body 1, a bearing 10, an inner hexagon bolt 11, PDC teeth 12 and a hobbing clamp 13.

As shown in fig. 2 and 3, the jig main body 1 is composed of a clamp holder 2, a PDC tooth mounting groove 3, a hobbing jig mounting groove 4, two bearing mounting holes 5, two countersunk head threaded holes 6, an angle cushion block 7, and a bolt 9. Countersunk head threaded holes 6 formed in two side walls of the PDC tooth mounting groove 4 are matched with the inner hexagon bolts 11, and the PDC teeth 12 are fixed in the PDC tooth mounting groove 3 by rotationally adjusting the inner hexagon bolts 11; the angle cushion block 7 is fixedly arranged at the bottom of the PDC tooth mounting groove 5 through the through hole 8 by the bolt 9, different angle cushion blocks 7 can be replaced, and the rock scraping angle of the PDC tooth 12 is adjusted; bearing mounting holes 5 are formed in two side walls of the clamp body 1 and used for mounting a bearing 10 and supporting and rotating the hobbing clamp 13.

As shown in fig. 4, the hobbing clamp 13 consists of a hobbing clamp carcass 14, six clamping sleeves 17, hard alloy teeth 16, a threaded rod 18 and an adjusting nut 15; the two ends of the threaded rod 18 are cylindrical surfaces of the threaded rod 18 and are matched and connected with the bearing inner hole of the bearing 10, so that the hobbing clamp 13 is installed in the hobbing clamp installation groove 4; the cylindrical external thread in the middle of the threaded rod 18 is matched and connected with the threaded through hole 20 on the hobbing clamp matrix 14, two adjusting nuts 15 are respectively arranged on two sides of the hobbing clamp matrix 14 on the threaded rod 18, the axial position of the hobbing clamp matrix 14 on the threaded rod 18 is adjusted by rotating the two adjusting nuts 15, and then the left and right positions of the hobbing clamp 13 in the hobbing clamp mounting groove 4 are adjusted.

As shown in fig. 5, the hobbing clamp carcass 14 consists of six clamping sleeve mounting holes 19 and a threaded through hole 20; six clamping sleeve mounting holes 19 are formed in the circumferential outer side of the hobbing clamp matrix 14 at equal intervals, the bottom of each clamping sleeve mounting hole is a cylindrical threaded hole, and the hole surface of each clamping sleeve mounting hole 19 is a conical surface; a threaded through hole 20 is formed along the direction vertical to the end face by taking the center of the end face circle of the hobbing clamp matrix 14 as the center.

As shown in fig. 6, the clamping sleeve 17 is composed of a hexagonal chuck 21 and a cemented carbide tooth clamping hole 22. The bottom of the clamping sleeve 17 is provided with a cylindrical external thread which is matched and connected with a threaded hole at the bottom of the clamping sleeve mounting hole 19, the middle part of the clamping sleeve 17 is a cone which takes the inner diameter of the cylindrical external thread at the bottom as an initial diameter and gradually increases the outer diameter, and the outer surface of the cone is matched with the molded surface of the hole surface of the conical hole of the clamping sleeve mounting hole 19; the top of the clamping sleeve 17 has certain contractibility in the radial direction, the axial depth of the clamping sleeve 17 in the clamping sleeve mounting hole 19 is rotationally adjusted by clamping the hexagonal chuck 21 at the top of the clamping sleeve 17, and the aperture of the hard alloy tooth clamping hole 22 is reduced due to the mutual matching and extrusion of the conical hole surface of the clamping sleeve mounting hole 19 and the conical outer surface profile of the clamping sleeve 17, so that the hard alloy tooth 16 is clamped.