CN111266903A

CN111266903A - Clamp apparatus

Info

Publication number: CN111266903A
Application number: CN202010243164.2A
Authority: CN
Inventors: 张涛; 葛建伟; 高兆春; 殷伟
Original assignee: Zhejiang Headman Intelligent Equipment Co ltd
Current assignee: Zhejiang Headman Intelligent Equipment Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-06-12

Abstract

The invention provides a clamp, and belongs to the technical field of clamps. The clamping fixture solves the problem that a part is easy to deform when a thin-wall annular part is clamped. The clamping assembly is provided with a first clamping part which is cylindrical and has elasticity, a second clamping part which is cylindrical and has elasticity, the clamping part is positioned on the inner side of the first clamping part and is provided with an annular installation channel between the first clamping part and the second clamping part, the first clamping part and the second clamping part are in conical surface contact with the base, and the first clamping part and the clamping part can be close to each other through the conical surface contact when the connecting plate slides along the direction of the central axis. The processing method has the advantages of high processing precision, difficult deformation of parts, simple structure, low cost and the like.

Description

Clamp apparatus

Technical Field

The invention belongs to the technical field of clamps, and relates to a clamp.

Background

When a hole or a groove is machined on the end face of the thin-wall annular part, the structural strength of the thin-wall annular part is weak, so that the thin-wall annular part is not suitable for being clamped by a conventional main shaft clamp. At present, a common clamping method is to realize clamping by a surface-to-surface contact method, such as a numerical control lathe clamp disclosed in the patent application No. 201410441910.3, which comprises a clamp seat, a main body, a collet chuck, a pull ring, a support seat, a conical sleeve, a positioning cylinder seat, a pull rod head, a clamping block and a positioning cylinder, wherein the clamp seat is fixed on a main shaft, the front end of the main body is fixedly connected with the clamp seat, the support seat is positioned in the main body, the front end of the support seat is fixed on the clamp seat, the positioning cylinder seat is fixed on the rear end surface of the support seat, the positioning cylinder is fixed on the rear end surface of the support seat, an annular groove is arranged on the inner wall of the rear end of the main body, the conical sleeve is arranged in the annular groove, the inner wall of the conical sleeve is a conical surface, the collet chuck is arranged in the main body and positioned between the main body and the support seat, the outer wall of the rear end, the pull ring is fixed on the pull rod head, the pull ring is fixedly connected with the spring chuck, and the pull rod head is connected with a clamping oil cylinder of the lathe through the pull rod. When the pull ring moves, the spring chuck is driven to retract inwards in a conical surface matching mode, so that the spring chuck is clamped on the outer peripheral surface of the annular part to prevent the annular part from deforming.

However, in the actual production process, it is found that, because the wall thickness of the thin-walled annular part is very thin, when the collet chuck is used to clamp the annular part on the outer peripheral surface of the part, the part is easily deformed due to the clamping force applied to one side of the part because the inner side of the part is not supported, so that the verticality between the end surface to be machined of the part and the clamping surface is poor, and thus the machined end surface of the part cannot be kept perpendicular to the feeding direction of the tool, and the machining precision is poor.

In addition to this method, there is a jig for clamping an annular part by pressing against an inner peripheral surface thereof, for example, a machine tool jig for machining a thin-walled workpiece of a rotating body disclosed in application No. 200710134795.5, but this method may also cause deformation of the part due to a single-sided force.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a clamp which solves the problem that a thin-wall annular part is easy to deform when clamped.

The purpose of the invention can be realized by the following technical scheme:

anchor clamps, including the base, the centre gripping subassembly that forms the linkage relation along the central axis direction slip in the base is provided with the connecting plate and forms the linkage relation with the connecting plate, is equipped with on the centre gripping subassembly to be the tube-shape and have elastic clamping part one, its characterized in that, the centre gripping subassembly on still be equipped with and be the tube-shape and have elastic clamping part two, the clamping part is located clamping part one inboard and is equipped with annular installation passageway between the two, clamping part one and clamping part two all with form conical surface contact between the base, pass through when the connecting plate slides along the central axis direction conical surface contact enable clamping part one and clamping part be close to each other.

The fixture is mainly used when the end face of a thin-wall annular part is machined, the base is fixed on a main shaft of a numerical control lathe, the direction of the central line of the base and the axial direction of the main shaft are in the same direction, therefore, the sliding direction of the connecting plate and the axial direction of the main shaft can be ensured to be in the same direction, and a self-contained oil cylinder piston rod in the main shaft of the numerical control lathe is fixed with the connecting plate. A worker places a thin-wall annular part in an annular mounting channel between the first clamping part and the second clamping part, then controls an oil cylinder in a main shaft of the numerically controlled lathe to work, a piston rod of the oil cylinder pulls the connecting plate in the direction away from the cavity, and the clamping assembly is linked with the connecting plate to enable the first clamping part to contract inwards under the action of the conical surface and the second clamping part to expand outwards under the action of the conical surface, namely the first clamping part and the second clamping part are close to each other. Thus, the clamping part I is clamped on the outer peripheral surface of the thin-wall annular part, and the clamping part II is clamped on the inner peripheral surface of the thin-wall annular part, so that the inner and outer clamping is realized simultaneously.

Through the arrangement of the first clamping part and the second clamping part, the inner and outer clamping of the thin-wall annular part is formed, so that the condition of unilateral stress cannot occur at the thin wall of the thin-wall annular part, namely, the balance is formed by the inner and outer clamping, the thin-wall annular part cannot deform during clamping, the end face of the thin-wall annular part can be ensured to keep good verticality with the clamping face after clamping, and the processing precision and the product quality are ensured. In the clamp, the clamping action of the clamping component is formed along with the linkage of the connecting plate, and the connecting plate is directly driven by the existing oil cylinder in the main shaft of the numerical control lathe without being driven by other driving sources or modes, so that the structure is simpler and the cost is lower. In addition, the mutual approaching of the first clamping part and the second clamping part can be realized simultaneously only through one-time action of the oil cylinder, and the clamping efficiency is well improved.

In the above-mentioned clamp, the first clamping portion includes a plurality of first clamping flaps, the second clamping portion includes a plurality of second clamping flaps, an outer side wall of each first clamping flap is in conical surface contact with the base, and an inner side wall of each second clamping flap is in conical surface contact with the base.

When the first clamping assembly moves along with the sliding of the connecting plate, the first clamping flaps are clamped inwards under the action of the conical surface, and the second clamping flaps are tensioned outwards under the action of the conical surface, so that the inner and outer clamping of the thin-wall annular part is formed to prevent the deformation of the thin-wall annular part.

In the above-mentioned clamp, the base includes that one end is equipped with the pedestal of cavity and locates the direction subassembly in the cavity, and the centre gripping subassembly is located the cavity, and each card lamella one cooperatees with cavity oral area inner wall, and the direction subassembly is located each two inboard sides of card lamella and can make each card lamella both ends outwards rise when the connecting plate slides.

When the connecting plate slides, one end part of each clamping flap is clamped inwards under the action of the inner wall of the opening part of the concave cavity, and the two end parts of each clamping flap are tensioned outwards under the action of the guide assembly. By means of the arrangement of the inner wall of the opening of the concave cavity and the guide assembly, the actions of the first clamping valve and the second clamping valve when the connecting plate slides can not interfere with each other, and the reliability of clamping the inner part and the outer part of the thin-wall annular part to prevent the thin-wall annular part from deforming is ensured.

In the clamp, each clamping flap II is fixed on the bottom wall of the concave cavity, the guide assembly comprises a positioning rod fixed at the center of the bottom wall of the concave cavity and a guide core sleeved outside the positioning rod, the guide core is in conical surface contact with each clamping flap II, a spring is sleeved on the positioning rod, a blocking part extending into the concave cavity is arranged on the connecting plate, and the guide core abuts against the blocking part under the elastic action of the spring.

In the initial state, the guide core abuts against the stopper and cannot move. When the connecting plate moves, the blocking piece is separated from the guide core, so that the blocking piece loses the blocking effect on the guide core, and the guide core also moves in the same direction as the connecting plate under the elastic force of the spring, so that the guide core can automatically and outwards tension the end parts of the clamping flaps II on the inner peripheral surface of the thin-wall annular part under the action of the conical surface; when the connecting plate returns, the blocking piece pushes against the guide core to overcome the elasticity of the spring to return synchronously.

By the arrangement mode, a linkage relation is formed between the guide core and the connecting plate, the outward tensioning of the two end parts of each clamping flap can be synchronously realized when each clamping flap is inwards clamped under the action of the inner wall of the opening part of the concave cavity, and the deformation of the thin-wall annular part is prevented when the thin-wall annular part is clamped.

In the clamp, as another technical scheme, each clamping flap II is fixed on the bottom wall of the concave cavity, the guide assembly comprises a guide core and a plurality of pull rods which penetrate through the bottom wall of the concave cavity and fix the guide core and the connecting plate, and the guide core is in conical surface contact with each clamping flap II.

In the above-mentioned clamp, the clamping petal comprises an arc-shaped sheet body II and an arc-shaped block body II fixedly connected with the two end parts of the arc-shaped sheet body, the clamping component comprises an annular support block II fixed on the bottom wall of the concave cavity, each arc-shaped sheet body II is fixedly connected on the annular support block II along the circumferential direction, and the guide core is in clearance fit with the annular support block II.

The second clamping flaps and the annular support block are combined into a structure similar to an elastic chuck, so that the second clamping flaps can be conveniently fixed in the concave cavity, and meanwhile, the second arc-shaped blocks can be outwards tensioned on the inner peripheral wall of the thin-wall annular part by means of elasticity when the guide core moves.

In the above-mentioned clamp, the clamping flap comprises a first arc-shaped sheet body and a first arc-shaped block body fixedly connected to one end of the first arc-shaped sheet body, the clamping assembly further comprises a first annular supporting block slidably arranged in the concave cavity, each first arc-shaped sheet body is fixedly connected to the first annular block body along the circumferential direction, and the connecting plate is fixed to the first annular supporting block body through a plurality of fasteners penetrating through the bottom wall of the concave cavity.

The first clamping clacks and the first annular support blocks are combined into a structure similar to an elastic chuck, the first annular support blocks and the connecting plate are fixed together through the first fastening pieces, and when the connecting plate slides, the first annular support blocks can drive the first clamping clacks to move, so that the first arc-shaped blocks are inwards contracted and clamped on the outer peripheral wall of the thin-wall annular part under the action of the inner wall of the opening of the cavity.

In the above-mentioned clamp, the clamping part two outsides be equipped with annular locating piece, link firmly a plurality of fasteners two on the diapire of cavity, the locating piece is fixed on each fastener two, the locating piece has the annular flange towards the terminal surface border of cavity oral area, annular flange tip is located between each arc block one and each arc block two.

When the thin-wall annular part is placed in the installation channel, the thin-wall annular part can abut against the end face of the annular flange, and the thin-wall annular part is just positioned between the first arc-shaped block and the second arc-shaped block, so that the first clamping part and the second clamping part can accurately clamp the thin-wall annular part to prevent the deformation caused by unilateral stress.

In the above-mentioned clamp, the annular support block is located between the positioning block and the bottom wall of the cavity, the fastener II comprises a fixing sleeve penetrating through the annular support block I and a fastening screw II sequentially penetrating through the positioning block and the fixing sleeve and in threaded connection with the bottom wall of the cavity, and two ends of the fixing sleeve are respectively abutted against the positioning block and the bottom wall of the cavity.

The first annular supporting block is arranged between the positioning block and the bottom wall of the cavity, so that the whole structure is more compact, and the size of the whole clamp cannot be increased. The second fastening piece comprises a first fixing sleeve and a second fastening screw, the first fixing sleeve penetrates through the annular supporting block, the second fastening screw penetrates through the positioning block and the first fixing sleeve in sequence and is in threaded connection with the bottom wall of the cavity, the first elastic clamp head moves normally due to the cooperation of the first fixing sleeve and the annular supporting block, and meanwhile, the positioning block is fixed normally in the cavity due to the cooperation of the second fastening screw and the first fixing sleeve.

In the above-mentioned clamp, the inner side of each arc block body is provided with an arc convex strip I, and the outer side of each arc block body II is provided with an arc convex strip II.

Each arc-shaped convex strip I can be attached to the outer peripheral surface of the thin-wall annular part, and each arc-shaped convex strip II can be attached to the inner peripheral surface of the thin-wall annular part, so that the clamping effect is further improved. Particularly, when the length of the thin-wall annular part along the base is short, the first convex strips and the second convex strips can be respectively attached to the whole outer peripheral wall and the inner peripheral wall of the thin-wall annular part, and the part is ensured to be less prone to deformation during clamping.

Compared with the prior art, the clamp has the following advantages:

1. through the action of the first clamping part and the second clamping part, the inner and outer clamping of the thin-wall annular part is formed, a good supporting effect is achieved, the deformation of the thin-wall annular part during clamping due to unilateral stress is avoided, and the processing precision and the product quality are ensured;

2. the inward contraction of each clamping flap I and the outward tension of each clamping flap II can be simultaneously realized through one-time action of the oil cylinder in the main shaft of the numerically controlled lathe, the clamping efficiency is well improved, and the driving is not needed by other driving sources or modes, so that the structure is simpler, and the cost is lower;

3. the arrangement of the positioning blocks enables the clamp to accurately clamp the thin-wall annular parts, and machining precision is guaranteed.

Drawings

FIG. 1 is a schematic perspective view of the fixture and the thin-walled annular part.

FIG. 2 is a sectional view of a first embodiment of the present clip (when a thin-walled annular part is attached).

Fig. 3 is a partially enlarged view of fig. 2.

Fig. 4 is a schematic perspective view of a first elastic clamp head in the clamp.

Fig. 5 is a partially exploded perspective view of the second collet of the present chuck.

In the figure, 1, a base; 1a, a seat body; 1a1, cavity; 1a2, annular lug; 1b, a seat board; 2. a connecting plate; 3. a first clamping part; 3a, clamping the first valve; 3a1, a first arc-shaped sheet body; 3a2, an arc block I; 3a21, a first convex strip; 4. a second clamping part; 4a, a second clamping flap; 4a1 and a second arc-shaped sheet body; 4a2 and a second arc block; 4a3, clamping block; 4a31 and a convex strip II; 5. installing a channel; 6. positioning a rod; 7. a guide core; 8. a spring; 9. a blocking member; 9a, a guide sleeve; 9b, a positioning screw; 10. a second annular supporting block; 11. a first annular supporting block; 12. a first fastener; 12a, a sliding sleeve; 12b, fastening a screw I; 13. positioning blocks; 13a, an annular flange; 14. a second fastener; 14a, a fixing sleeve; 14b, a second fastening screw; 15. a set screw; 16. mounting screws; 17. thin-walled annular parts.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 and 2, the fixture includes a base 1, the base 1 includes a base body 1a and a seat plate 1b, the base body 1a is in a cylindrical block shape, an end face of the base body 1a is provided with an installation cavity, and a connection plate 2 is arranged in the installation cavity along the central axis direction of the base body 1a, i.e. axially sliding. The outer peripheral wall of the seat body 1a is provided with an annular lug 1a2, the seat plate 1b is connected to one end face of the seat body 1a provided with a mounting cavity, the seat plate 1b and the seat body 1a are fixed through a fixing screw 15 penetrating through the annular lug 1a2 and penetrating into the seat plate 1b, and the connection of the seat plate 1b ensures that the connecting plate 2 can only slide in the mounting cavity and can not be separated from the mounting cavity. The seat plate 1b is annular, when in use, the seat plate 1b is fixed on a main shaft of a numerical control lathe, and an oil cylinder piston rod arranged in the main shaft of the numerical control lathe is fixed with the connecting plate 2 through a central hole of the seat plate 1 b.

As shown in fig. 1, 2 and 3, a concave cavity 1a1 is provided on the other end surface of the seat body 1a, a clamping component is provided in the concave cavity 1a1, and the clamping component and the connecting plate 2 form a linkage relationship. Be equipped with clamping part one 3 on the centre gripping subassembly, be equipped with clamping part two 4 on the clamping subassembly, clamping part one 3 all is the tube-shape and has elasticity with clamping part two 4, and clamping part two 4 is located the inboard of clamping part one 3 and is equipped with annular installation passageway 5 between the two, and clamping part one 3 and clamping part two 4 all form conical surface contact with the base between, pass through when connecting plate 2 slides along the central axis direction conical surface contact enable clamping part one 3 and clamping part two 4 be close to each other.

As shown in fig. 2, 3 and 4, the first clamping portion 3 includes a plurality of first clamping flaps 3a, and the outer side wall of each first clamping flap 3a is in conical contact with the base 1. Each clip flap 3a comprises an arc-shaped sheet body 3a1 and an arc-shaped block body 3a2 fixedly connected to the end of the arc-shaped sheet body 3a1, each clip assembly comprises an annular support block 11 arranged in the cavity 1a1 in a sliding mode, each arc-shaped sheet body 3a1 is fixedly connected to the end face, facing the opening of the cavity 1a1, of the annular support block 11 along the circumferential direction, the connecting plate 2 and the annular support block 11 are fixed through a plurality of fasteners 12 penetrating through the bottom wall of the cavity 1a1, and the outer side wall of each arc-shaped block body 3a2 is in conical surface contact with the inner wall of the opening of the cavity 1a 1. Specifically, each clip flap 3a and the annular support block 11 are of an integral structure, that is, a structure identical to an elastic chuck is combined, when the connecting plate 2 moves, each clip flap 3a can be driven to move by the annular support block 11, and then each arc-shaped block body 3a2 contracts inwards under the action of the conical surface. The inner side of each arc block body 3a2 is provided with an arc convex strip 3a 21.

In the embodiment shown in fig. 2, each fastening member 12 includes a sliding sleeve 12a penetrating through the bottom wall of the cavity 1a1 and a fastening screw 12b sequentially penetrating through the annular support block 11 and the sliding sleeve 12a and screwed into the connecting plate 2, and both ends of the sliding sleeve 12a respectively abut against the connecting plate 2 and the annular support block 11. The annular support piece 11 abuts against the end of the sliding sleeve 12a, so that a gap is formed between the annular support piece 11 and the bottom wall of the cavity 1a1, and the annular support piece 11 can smoothly slide towards the direction close to the installation cavity.

As shown in fig. 2, 3 and 5, the second clamping portion 4 includes a plurality of second clamping flaps 4a, and the inner side walls of the second clamping flaps 4a are in conical contact with the base 1. The base 1 further comprises a guide assembly arranged in the cavity 1a1, and the guide assembly is located on the inner side of each clamping flap 4a and can enable the end part of each clamping flap 4a to be tensioned outwards when the connecting plate 2 slides. Specifically, each second clip flap 4a comprises a second arc-shaped sheet body 4a1 and a second arc-shaped block body 4a2 fixedly connected to the end of the second arc-shaped sheet body 4a1, the clamping assembly comprises a second annular support block 10 fixed to the bottom wall of the cavity 1a1 through a plurality of mounting screws 16, the second annular support block 10 is located on the inner side of the first annular support block 11, and each second arc-shaped sheet body 4a1 is fixedly connected to the end face, facing the opening of the cavity 1a1, of the second annular support block 10 in the circumferential direction. Each second clip 4 further comprises a second clamping block 4a3 fixedly connected to the outer side of each second arc-shaped block 4a2, and the outer side of each clamping block 4a3 is provided with a second arc-shaped convex strip 4a 31.

As shown in FIG. 2, the guiding assembly comprises a positioning rod 6 fixed at the center of the bottom wall of the cavity 1a1 and a guiding core 7 sleeved outside the positioning rod 6, wherein the guiding core 7 is in conical surface contact with each arc-shaped block body two 4a 2. The positioning rod 6 is sleeved with a spring 8, the connecting plate 2 is provided with a blocking piece 9 extending into the cavity 1a1, and the guide core 7 is abutted against the blocking piece 9 under the action of the elastic force of the spring 8. Each clamping flap II 4a and the annular support block II 10 are of an integral structure, namely, a structure the same as an elastic chuck is formed, and when the connecting plate 2 slides, the guide core 7 moves along with the connecting plate 2, so that each arc-shaped block body II 4a2 is outwards tensioned under the action of the conical surface.

As shown in fig. 1 and 2, a mounting hole is further formed in the center of the bottom wall of the cavity 1a1, and one end of the positioning rod 6 is screwed into the mounting hole. The guide core 7 is cylindrical and blocky, a matching hole is formed in the center of one end face of the guide core 7, the positioning rod 6 is provided with a head, the positioning rod 6 penetrates through the guide core 7 from the matching hole, and the other end of the guide core 7 and the center hole of the second annular support block 10 form clearance fit. The spring 8 is sleeved on the positioning rod 6 in the matching hole, and two ends of the spring 8 are respectively abutted against the head and the bottom surface of the matching hole. The number of the blocking pieces 9 is several, and each blocking piece 9 is columnar and distributed along the circumferential direction. In particular, each blocking element 9 comprises a guide sleeve 9a passing through the bottom wall of cavity 1a1 and a set screw 9b passing through guide sleeve 9a and into connecting plate 2, guide sleeve 9a being axially fixed between set screw 9b and connecting plate 2.

As shown in fig. 2 and 3, an annular positioning block 13 is arranged outside the second clamping portion 4, a plurality of second fasteners 14 are fixedly connected to the bottom wall of the cavity 1a1, and the positioning block 13 is fixed to each fastener. The edge of one end face of positioning block 13 facing the mouth of cavity 1a1 has an annular flange 13a, and annular flange 13a is located between each arc-shaped block 3a2 and each clamping block 4a 3. The positioning block 13 is located inside the first clamping portion 3, and the annular support block 11 is located between the positioning block 13 and the bottom wall of the cavity 1a 1. The second fastening piece 14 comprises a fixing sleeve 14a penetrating through the annular support block I11 and a second fastening screw 14b sequentially penetrating through the positioning block 13 and the fixing sleeve 14a and screwed in the bottom wall of the cavity 1a1, and two ends of the fixing sleeve 14a respectively abut against the positioning block 13 and the bottom wall of the cavity 1a 1.

The clamp is mainly used when the thin-wall annular part 17 is machined, a worker places the thin-wall annular part 17 in the installation channel 5 between the first clamping part 3 and the second clamping part 4, and the thin-wall annular part 17 abuts against the end face of the annular flange 13 a. Then, an oil cylinder arranged in a main shaft of the numerically controlled lathe is controlled to work, a piston rod of the oil cylinder pulls the connecting plate 2 to a direction far away from the cavity 1a1, the connecting plate 2 drives the annular support blocks 11 to move synchronously through the fasteners 12, and the arc-shaped block bodies 3a2 on the clamping flaps 3a gradually contract inwards in the moving process through the conical surface effect between the arc-shaped block bodies and the mouth part of the cavity 1a1, so that the convex strips 3a21 are tightly pressed against the outer peripheral surface of the thin-wall annular part 17.

When the connecting plate 2 moves, the blocking piece 9 on the connecting plate 2 is separated from the guide core 7, so that the blocking effect on the guide core 7 is lost, and the guide core 7 also moves in the same direction as the connecting plate 2 under the action of the elastic force of the spring 8. Thus, the guide core 7 forces the arc blocks 4a2 to expand outward gradually by the tapered surface, so that the ribs 4a31 are pressed against the inner peripheral surface of the thin-walled annular component 17. The clamping part I3 is clamped on the outer peripheral surface of the thin-wall annular part 17, and the clamping part II 4 is tightly propped against the inner peripheral surface of the thin-wall annular part 17, so that the inner and outer clamping of the thin-wall annular part 17 is formed, the condition of unilateral stress on the thin wall of the thin-wall annular part 17 cannot occur, namely, the balance is formed by the inner and outer clamping, the thin-wall annular part 17 cannot deform during clamping, the end surface of the thin-wall annular part 17 can keep good verticality with the clamping surface after clamping, and the processing precision and the product quality are guaranteed.

In the clamp, each clamping flap 3a is fixed with the connecting plate 23 through the annular support block 11, the guide core 7 and the connecting plate 2 form a linkage relation, the connecting plate 2 is directly driven by the existing oil cylinder in the spindle of the numerically controlled lathe, and the clamp is not required to be driven by other driving sources or modes, so that the structure is simpler and the cost is lower. In addition, the inward contraction of the first clamping flaps 3a and the outward tensioning of the second clamping flaps 4a can be realized simultaneously through one-time action of the oil cylinder, and the clamping efficiency is well improved.

Example two

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the guiding assembly comprises a guiding core 7 and a plurality of pull rods penetrating through the bottom wall of the cavity 1a1 to fix the guiding core 7 and the connecting plate 2, and the guiding core 7 is in conical contact with each clamping flap 4 a.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. Anchor clamps, including base (1), the centre gripping subassembly that is equipped with on the centre gripping subassembly and is the tube-shape and has elastic clamping part one (3) and forms the linkage relation with connecting plate (2) along the central axis direction slip in base (1), clamping subassembly on still be equipped with and be the tube-shape and have elastic clamping part two (4), clamping part two (4) are located clamping part one (3) inboard and are equipped with annular installation passageway (5) between the two, clamping part one (3) and clamping part two (4) all with base (1) between form conical surface contact, pass through when connecting plate (2) slide along the central axis direction conical surface contact can make clamping part one (3) and clamping part two (4) be close to each other.

2. The clamp of claim 1, wherein the first clamping portion (3) comprises a plurality of first clamping flaps (3a), the second clamping portion (4) comprises a plurality of second clamping flaps (4a), the outer side wall of each first clamping flap (3a) is in conical contact with the base, and the inner side wall of each second clamping flap (4a) is in conical contact with the base.

3. The clamp of claim 2, wherein the base comprises a seat body having a cavity (1a1) at one end and a guide member disposed in the cavity (1a1), the clamping member is disposed in the cavity (1a1), each of the first clamping flaps (3a) is engaged with an inner wall of the opening of the cavity (1a1), and the guide member is disposed inside each of the second clamping flaps (4a) and is capable of tensioning an end portion of each of the second clamping flaps (4a) outwardly when the connecting plate (2) slides.

4. The clamp according to claim 3, characterized in that each second clip flap (4a) is fixed on the bottom wall of the cavity (1a1), the guiding assembly comprises a positioning rod (6) fixed at the center of the bottom wall of the cavity (1a1) and a guiding core (7) sleeved outside the positioning rod (6), the guiding core (7) is in conical contact with each second clip flap (4a), the positioning rod (6) is sleeved with a spring (8), the connecting plate (2) is provided with a blocking part extending into the cavity (1a1), and the guiding core (7) abuts against the blocking part under the elastic force of the spring (8).

5. The clamp according to claim 3, characterized in that each of the two flaps (4a) is fixed to the bottom wall of the cavity (1a1), the guiding assembly comprising a guiding core (7) and a plurality of tie rods passing through the bottom wall of the cavity (1a1) to fix the guiding core (7) to the connecting plate (2), the guiding core (7) being in conical contact with each of the two flaps (4 a).

6. The clamp of claim 2, 3, 4 or 5, wherein the second clamping flap (4a) comprises a second arc-shaped sheet body (4a1) and a second arc-shaped block body (4a2) fixedly connected to the end of the second arc-shaped sheet body (4a1), the clamping assembly comprises a second annular support block (10) fixedly arranged on the bottom wall of the cavity (1a1), each second arc-shaped sheet body (4a1) is fixedly connected to the second annular support block (10) along the circumferential direction, and the guide core (7) is in clearance fit with the second annular support block (10).

7. The clamp of claim 6, wherein the first clamping flap (3a) comprises a first arc-shaped sheet body (3a1) and a first arc-shaped sheet body (3a2) fixedly connected to the end of the first arc-shaped sheet body (3a1), the clamping assembly further comprises a first annular support block (11) slidably arranged in the cavity (1a1), each first arc-shaped sheet body (3a1) is fixedly connected to the first annular support block (11) along the circumferential direction, and the connecting plate (2) and the first annular support block (11) are fixed through a plurality of first fasteners (12) penetrating through the bottom wall of the cavity (1a 1).

8. The clamp according to claim 7, characterized in that an annular positioning block (13) is arranged outside the second clamping portion (4), a plurality of second fasteners (14) are fixedly connected to the bottom wall of the cavity (1a1), the positioning block (13) is fixed on each second fastener (14), an annular flange (13a) is arranged on one end face edge of the positioning block (13) facing the mouth of the cavity (1a1), and the end part of the annular flange (13a) is positioned between each first arc-shaped block (3a2) and each second arc-shaped block (4a 2).

9. The clamp according to claim 8, characterized in that the first annular support (11) is located between the positioning block (13) and the bottom wall of the cavity (1a1), and the second fastening member (14) comprises a second fastening screw (14b) passing through the second annular support (11) and a second fastening sleeve (14a) passing through the first annular support (11) and the positioning block (13) and the second fastening screw (14a) and threaded into the bottom wall of the cavity (1a1), wherein two ends of the second fastening screw (14a) respectively abut against the positioning block (13) and the bottom wall of the cavity (1a 1).

10. The jig of claim 6 wherein each of the arcuate blocks (3a2) is provided with an arcuate rib (3a21) on the inside and an arcuate rib (4a31) on the outside of each of the arcuate blocks (4a 2).