CN111468751A

CN111468751A - Tensioning clamp

Info

Publication number: CN111468751A
Application number: CN202010241427.6A
Authority: CN
Inventors: 李永泉
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2020-07-31

Abstract

The invention discloses a tensioning clamp, which comprises: the push plate is connected with the pull rod and moves along with the pull rod; the push plate is provided with an axial through hole arranged along the axial direction of the push plate and a radial through hole arranged along the radial direction of the push plate and penetrating through the axial through hole; the connecting seat is connected with an outer shell sleeved on the periphery of the push plate; a tensioning shaft penetrating through the axial through hole is connected between the connecting seat and the outer shell, and one end of the tensioning shaft penetrating through the outer shell is connected with a hook pressing plate; the inside of straining shaft is equipped with the spiral guide way, is equipped with the uide pin that runs through in the spiral guide way in the radial through-hole of push pedal. Because the guide pin is simultaneously positioned in the radial through hole and the spiral guide groove of the push plate, the lower shell of the push plate drives the guide pin to do linear motion under the action of the pull rod, and the guide pin drives the tensioning shaft to rotate around the axis of the guide pin so as to enable the hook pressing plate on the tensioning shaft to rotate, so that the workpiece is quickly clamped on the clamp, and the clamping and positioning efficiency of the workpiece can be effectively improved.

Description

Tensioning clamp

Technical Field

The invention relates to the technical field of machine tool clamps, in particular to a tensioning clamp.

Background

In the machining process of automobile parts (such as hubs), the radial positioning precision of a clamped workpiece on a clamp and the clamping reliability of the clamp on the clamped workpiece are very important to the machining precision of the clamped workpiece.

The existing lathe fixture can not ensure that the axis of a clamped workpiece is collinear with the axis of a machine tool machining shaft, and the lathe fixture has the problem of infirm workpiece clamping.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the machine tool clamp in the prior art is difficult to clamp a workpiece accurately and quickly, thereby providing a tensioning clamp.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a tensioning clamp comprising:

the connecting seat is provided with a mounting through hole which is arranged along the radial direction of the connecting seat;

the pull rod is movably arranged in the mounting through hole along the radial direction of the connecting seat;

the push plate is connected with the pull rod and moves along with the pull rod; the push plate is provided with a plurality of axial through holes arranged along the axial direction of the push plate, and the push plate is also provided with a plurality of radial through holes arranged along the radial direction of the push plate and penetrating through the axial through holes;

one end of the outer shell is connected with the connecting seat and sleeved on the periphery of the push plate, and a positioning sleeve for positioning and mounting a workpiece is arranged at one end of the outer shell, which is opposite to the connecting seat;

one end of the tensioning shaft penetrates through an axial through hole of the push plate and is connected with the connecting seat, the other end of the tensioning shaft penetrates through the outer shell and is connected with a hook pressing plate, and a clamping space for clamping a workpiece is formed between the hook pressing plate and the outer shell;

a spiral guide groove is formed in the tensioning shaft, a guide pin is arranged in the spiral guide groove, and at least one end of the guide pin extends out of an opening of the spiral guide groove and extends into a radial through hole of the push plate; in the process that the pull rod pushes the push plate to move, the guide pin moves along with the push plate and drives the tightening shaft to rotate around the axis of the tightening shaft through the spiral guide groove, so that the hook pressing plate rotates inwards to press the workpiece or rotates outwards to loosen the workpiece.

Furthermore, the end part of one end of the tensioning shaft, which is connected with the connecting seat, is also provided with a mounting hole, and elastic glue is arranged in the mounting hole; one end of the elastic rubber is connected to the hole bottom of the mounting hole, and the other end of the elastic rubber extends out of the mounting hole and is connected to the connecting seat.

Further, the width of the groove opening at each part of the spiral guide groove is matched with the diameter of the guide pin.

Furthermore, the spiral guide groove is a guide through groove with openings on two opposite sides, and the guide pin penetrates through the spiral guide groove and two ends of the guide pin respectively extend out of the openings on the two sides of the spiral guide groove and extend into the radial through hole of the push plate.

Furthermore, the axial through holes and the tensioning shafts are all multiple and are arranged along the circumferential direction of the push plate at even intervals.

Furthermore, a stepped hole is formed in the middle of the push plate, the outer edge of the end portion of one end, extending into the outer shell, of the pull rod is matched with the inner edge of the portion with the small hole diameter of the stepped hole, the end portion, extending into the outer shell, of the pull rod is connected with a check ring, and the outer edge of the check ring is matched with the inner edge of the portion with the large hole diameter of the stepped hole and blocks the radial through hole in the push plate.

Furthermore, the connecting seat is connected with a guide rod which is arranged in the same radial direction as the tensioning shaft and penetrates through the push plate.

Furthermore, the outer edge of the push plate is abutted against the inner wall of the outer shell, and a limiting step structure which is abutted against the upper surface of the push plate in a limiting manner so as to prevent the stroke of the push plate from being too large is arranged on the inner wall of the outer shell.

Furthermore, the hook pressing plate is a cam connected to one end part of the tensioning shaft extending out of the shell; when the convex part of the cam rotates towards the center line direction of the positioning sleeve, the convex part of the cam is matched with the outer shell to clamp the workpiece.

Further, the shell body is installed the tip of the one end of position sleeve is equipped with a plurality of positioning groove, the periphery of position sleeve be equipped with a plurality ofly with positioning groove one-to-one complex installation otic placode, the centre of position sleeve is equipped with the confession the work piece is above that the central locating hole of location installation.

The technical scheme of the invention has the following advantages:

1. the tensioning clamp provided by the invention has the advantages that in the process of installing and clamping a workpiece on the clamp, the workpiece is firstly installed on the positioning sleeve, then the pull rod is pushed towards the positioning sleeve, the pull rod drives the push plate and the guide pin limited in the radial through hole of the push plate to move towards the positioning sleeve, and the guide pin is simultaneously positioned in the radial through hole and the spiral guide groove of the tensioning shaft, so that the guide pin can move along the guide direction of the spiral guide groove in the movement process, the tensioning shaft is driven to rotate around the axial direction of the tensioning shaft, and the hook pressing plate fixed on the tensioning shaft rotates along with the tensioning shaft to press the workpiece positioned on the positioning sleeve tightly, so that the positioning and clamping of the workpiece are realized; the process that the clamp loosens the workpiece can be realized only by pulling the pull rod outwards. According to the tensioning clamp, the spiral guide groove is formed in the tensioning shaft, so that the linear motion of the pull rod can be converted into the rotary motion of the tensioning shaft, the workpiece can be quickly clamped after being loaded conveniently, and the clamping and positioning efficiency of the workpiece is effectively improved; and the workpiece unloading operation is more convenient.

2. According to the tensioning clamp provided by the invention, the elastic rubber is arranged between the connecting seat and the tensioning shaft, so that the buffering effect can be achieved, the adhesive force of direct contact between the connecting seat and the tensioning shaft can be reduced by the elastic rubber, and the tensioning shaft can be ensured to rotate smoothly.

3. According to the tensioning clamp provided by the invention, the width of the notch at each position of the spiral guide groove is matched with the diameter of the guide pin, so that the stability of the guide pin driving the tensioning shaft to rotate can be improved.

4. According to the tensioning clamp provided by the invention, the openings are formed in the two opposite sides of the spiral guide groove, and the two ends of the guide pin respectively extend out of the openings of the spiral guide groove and extend into the radial through holes of the push plate, so that the transmission stability can be improved.

5. According to the tensioning clamp provided by the invention, the axial through holes and the tensioning shafts are uniformly arranged along the circumferential direction of the push plate at intervals, and the hook pressure plates on the axial through holes and the tensioning shafts can be respectively driven to rotate by the tensioning shafts, so that the clamping of some foreign workpieces is realized in a matching manner.

6. According to the tensioning clamp provided by the invention, the retainer ring embedded in the step hole of the push plate can play a role in connecting the push plate and the pull rod, and the outer edge of the retainer ring blocks the radial through hole in the push plate, so that the guide pin can be prevented from being separated from the radial through hole, and the stability of the guide pin mounting structure is improved.

7. According to the tensioning clamp provided by the invention, the guide rod on the push plate plays a role in guiding the movement direction of the push plate, so that the stability of the push plate in linear movement along with the pull rod can be ensured, and the phenomenon that the rotation of the tensioning shaft is blocked due to the deviation of the movement direction of the push plate is avoided.

8. According to the tensioning clamp provided by the invention, the limit step structure on the inner wall of the outer shell can prevent the situation that the stroke of the push plate is too large, the situation that the guide pin moves to the limit position of the spiral guide groove and then continuously drives the tensioning shaft to move is avoided, and the clamping plate on the tensioning shaft can stably clamp a workpiece.

9. The tensioning clamp provided by the invention adopts the hook pressing plate with the cam structure, can clamp and release a workpiece through rotation, has a simple structure, and is convenient for the workpiece to be quickly assembled and disassembled on the clamp.

10. According to the tensioning clamp provided by the invention, the positioning groove on the end part of the outer shell body and the lug plates arranged on the periphery of the positioning sleeve are arranged, so that the positioning sleeve is conveniently and stably fixed on the outer shell body, and the positioning precision of a workpiece positioned on the positioning sleeve is ensured.

Drawings

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

FIG. 1 is a schematic view of the first side of the tensioning clamp of the present invention;

FIG. 2 is a schematic structural view of the second side of the tightening clamp in an embodiment of the present invention, showing the mounting structure of the positioning sleeve on the outer shell;

FIG. 3 is a schematic view of a half-section of a tensioning clamp according to an embodiment of the present invention;

FIG. 4 is a schematic view of the internal structure of the tensioning clamp of the present invention, wherein the outer shell is hidden to show the internal structure thereof;

FIG. 5 is a schematic view showing the installation structure of the guide pin in the spiral guide groove of the tension shaft according to the embodiment of the present invention;

fig. 6 is a schematic diagram of the installation structure of the pull rod, the retainer ring and the guide pin on the push plate in the embodiment of the invention, wherein the retainer ring moves upwards for a certain distance to show the stepped hole on the push plate.

Description of reference numerals: 1. a connecting seat; 2. a pull rod; 3. pushing the plate; 31. an axial through hole; 32. a radial through hole; 33. a stepped bore; 4. an outer housing; 41. a limiting step structure; 42. a positioning groove; 5. a positioning sleeve; 51. mounting an ear plate; 7. tensioning the shaft; 71. a spiral guide groove; 72. mounting holes; 8. hooking and pressing the plate; 9. a guide pin; 10. elastic glue; 11. a retainer ring; 12. a guide bar; 13. installing a groove; 14. a bearing; 15. and (7) a cover plate.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

A tightening clamp as shown in fig. 1-6, comprising a connecting base 1, a pull rod 2, an outer shell 4, a push plate 3 and a tightening shaft 7. Wherein, connecting seat 1 is used for and lathe fixed connection, has along its radial installation through-hole of seting up in the middle of connecting seat 1. The outer shell 4 is arranged on one side surface of the connecting seat 1 and covers the peripheries of the push plate 3 and the tensioning shaft 7, and one end of the outer shell 4, which is opposite to the connecting seat 1, is provided with a positioning sleeve 5 for positioning and installing a workpiece on the positioning sleeve. The pull rod 2 is movably installed in the installation through hole along the radial direction of the connecting seat 1, one end of the pull rod extends into the outer shell 4, and the other end of the pull rod is located outside the outer shell 4. The push plate 3 is connected on the pull rod 2 and is positioned in the outer shell 4, the push plate 3 is provided with a plurality of axial through holes 31 which are arranged along the axial direction of the push plate 3, and the push plate 3 is also provided with a plurality of radial through holes 32 which are arranged along the radial direction of the push plate and penetrate through the axial through holes 31. The axial through hole 31 that the one end of straining shaft 7 runs through push pedal 3 connects in connecting seat 1, the other end passes shell body 4 and is connected with colludes clamp plate 8, colludes and is formed with the centre gripping space that is used for centre gripping work piece between clamp plate 8 and the shell body 4. The interior of the tensioning shaft 7 is provided with a spiral guide groove 71, a guide pin 9 is arranged in the spiral guide groove 71, and at least one end of the guide pin 9 extends out of the opening of the spiral guide groove 71 and extends into the radial through hole 32 of the push plate 3. During the process that the pull rod 2 pushes the push plate 3 to move, the guide pin 9 moves along with the push plate 3 and drives the tightening shaft 7 to rotate around the axis thereof through the spiral guide groove 71 so as to enable the pressure hooking plate 8 to rotate inwards to press a workpiece positioned on the positioning sleeve 5 or rotate outwards to loosen the workpiece positioned on the positioning sleeve 5.

According to the tensioning clamp, in the process of installing and clamping a workpiece on the clamp, the workpiece is firstly installed on the positioning sleeve 5, then the pull rod 2 is pushed towards the direction of the positioning sleeve 5, the pull rod 2 drives the push plate 3 and the guide pin 9 limited in the radial through hole 32 of the push plate 3 to move towards the direction of the positioning sleeve 5 together, as the guide pin 9 is simultaneously positioned in the radial through hole 32 and the spiral guide groove 71 of the tensioning shaft 7, the guide pin 9 can move along the guide direction of the spiral guide groove 71 in the movement process, so that the tensioning shaft 7 is driven to rotate around the axial direction of the tensioning shaft, and the hook pressing plate 8 fixed on the tensioning shaft 7 rotates inwards along with the tensioning shaft 7 to press the workpiece positioned on the positioning sleeve 5, so that the positioning and clamping of the workpiece are realized; the process that the clamp loosens the workpiece can be realized only by pulling the pull rod 2 outwards. According to the tensioning clamp, the spiral guide groove 71 is formed in the tensioning shaft 7, so that the linear motion of the pull rod 2 can be converted into the rotary motion of the tensioning shaft 7, the workpiece can be quickly clamped after being loaded conveniently, and the clamping and positioning efficiency of the workpiece is effectively improved; and the workpiece unloading operation is more convenient.

In this embodiment, a mounting groove 13 is formed in the connecting base 1, one end of the tightening shaft 7 connected to the connecting base 1 extends into the mounting groove 13 and is rotatably connected to the connecting base 1 through a bearing 14, and a cover plate 15 sleeved on the periphery of the tightening shaft 7 is further covered on an opening of the mounting groove 13. The end part of one end of the tensioning shaft 7 connected with the connecting seat 1 is also provided with a mounting hole 72, the mounting hole 72 is arranged along the radial direction of the tensioning shaft 7, and the opening of the mounting hole 72 is arranged opposite to the bottom of the mounting groove 13.

In one embodiment of the present embodiment, the elastic glue 10 is accommodated in the mounting hole 72, and one end of the elastic glue 10 extends into the bottom of the mounting hole 72, and the other end of the elastic glue 10 extends out of the mounting hole 72 and abuts against the bottom of the mounting groove 13. The setting of the elastic rubber 10 between the mounting groove 13 and the tensioning shaft 7 on the connecting base 1 can play the role of buffering on the one hand, and on the other hand, the elastic rubber 10 can reduce the adhesive force of the direct contact of the connecting base 1 and the tensioning shaft 7, so that the tensioning shaft 7 can be ensured to rotate smoothly.

In another embodiment of this embodiment, a torsion spring is installed in the installation hole 72, one end of the torsion spring is connected to the bottom of the installation hole 72, and the other end of the torsion spring is connected to the bottom of the installation groove 13. When the tightening shaft 7 rotates under the action of the guide pin 9 so that the hook pressing plate 8 on the tightening shaft compresses the workpiece on the positioning sleeve 5, the torsion spring accumulates elastic potential energy along with the rotation of the tightening shaft 7, when the clamp needs to loosen the workpiece, the external force acting on the tightening shaft 2 disappears, the tightening shaft 7 and the push plate 3 can be rapidly reset under the action of the elastic restoring force of the torsion spring, the compression on the workpiece can be rapidly released as long as the external force acting on the tightening shaft 2 disappears, and the workpiece unloading efficiency is improved.

In this embodiment, the width of the slot at each position of the spiral guide groove 71 is matched with the diameter of the guide pin 9, so as to improve the stability of the guide pin 9 driving the tightening shaft 7 to rotate. In the axial direction of the tightening shaft 7, an angle of 90 degrees is formed between groove bodies at both ends of the spiral guide groove 71.

In the present embodiment, in the radial direction of the tightening shaft 7, the spiral guide groove 71 is a guide through groove having openings on opposite sides, and the guide pin 9 penetrates through the spiral guide groove 71, and has two ends respectively protruding from the openings on the two sides of the spiral guide groove 71 and protruding into the radial through hole 32 of the push plate 3. Because both ends of the guide pin 9 respectively extend into the radial through holes 32 of the push plate 3, the transmission stability of the guide pin 9 can be improved. In other embodiments, the spiral guide groove 71 may be a one-way open groove having an opening on one side in the radial direction of the tightening shaft 7, and one end of the guide pin 9 extends into the opening of the one-way open groove and the other end extends into the radial through hole 32 of the push plate 3.

In this embodiment, push pedal 3 is the disc type, and axial through hole 31 on the push pedal 3 has four along the even interval arrangement in circumference of push pedal 3, all rotates on every axial through hole 31 to be connected with a tensioning axle 7, and the tip that stretches out shell body 4 of every tensioning axle 7 all is connected with colludes clamp plate 8. Four spiral guide grooves 71 in the four tensioning shafts 7 are symmetrically arranged around the central axis of the push plate 3, namely the spiral guide groove 71 on one tensioning shaft 7 can be overlapped with the spiral guide grooves 71 on the other three tensioning shafts 7 after rotating for 90 degrees, 180 degrees and 270 degrees around the central axis of the push plate 3. The four tensioning shafts 7 respectively drive the hook pressing plates 8 on the tensioning shafts to rotate, and the hook pressing plates are matched together to clamp different workpieces. In other embodiments, the number of the tensioning shafts 7 can also be three, five or more, and can be specifically selected according to actual needs and the shape adaptability of the workpiece.

In this embodiment, a stepped hole 33 is formed in the middle of the push plate 3, the outer edge of the end of the pull rod 2 extending into the outer shell 4 is matched with the inner edge of the part with the small aperture of the stepped hole 33, the end of the pull rod 2 extending into the outer shell 4 is connected with a retaining ring 11, and the outer edge of the retaining ring 11 is matched with the inner edge of the part with the large aperture of the stepped hole 33 and blocks the radial through hole 32 on the push plate 3. The retainer ring 11 embedded in the stepped hole 33 of the push plate 3 can not only play a role of connecting the push plate 3 and the pull rod 2, but also the outer edge of the retainer ring 11 blocks the radial through hole 32 on the push plate 3, so that the guide pin 9 can be prevented from being separated from the radial through hole 32, and the stability of the installation structure of the guide pin 9 is improved.

In this embodiment, the connecting base 1 is connected with two guide rods 12 which are arranged in the same radial direction as the tensioning shaft 7 and penetrate through the push plate 3, and the two guide rods 12 are arranged away from each other. The arrangement of the two guide rods 12 plays a role in guiding the motion direction of the push plate 3, so that the stability of the push plate 3 in linear motion along with the pull rod 2 can be ensured, and the phenomenon that the rotation of the tensioning shaft 7 is blocked due to the deviation of the motion direction of the push plate 3 is avoided. Of course, the number of the guide bars 12 may also be one, three or more.

In this embodiment, the outer edge of the push plate 3 abuts against the inner wall of the outer shell 4, and the inner wall of the outer shell 4 can block the opening of the radial through hole 32 in the push plate 3, so as to prevent the guide pin 9 in the radial through hole 32 from coming out. The inner wall of the outer shell 4 is provided with the limiting step structure 41 which is in limiting and abutting contact with the upper surface of the push plate 3, the arrangement of the limiting step structure 41 on the inner wall of the outer shell 4 can prevent the push plate 3 from having an overlarge stroke, the guide pin 9 is prevented from continuously driving the tensioning shaft 7 to move after moving to the limit position of the spiral guide groove 71, and the clamping plate 8 on the tensioning shaft 7 can be ensured to stably clamp a workpiece.

In the present embodiment, the hook pressing plate 8 is specifically a cam connected to one end of the tightening shaft 7 extending out of the outer shell 4; when the convex portion of the cam is rotated toward the center line direction of the positioning sleeve 5, the convex portion of the cam and the outer case 4 cooperate to clamp the workpiece. The hook pressing plate 8 with the cam structure can clamp and release the workpiece through rotation of the tensioning shaft 7, and is simple in structure and convenient to quickly disassemble and assemble the workpiece on the clamp.

In this embodiment, the end of the outer shell 4 at which the positioning sleeve 5 is mounted is provided with four positioning grooves 42, the periphery of the positioning sleeve 5 is provided with four mounting lugs 51 which are matched with the positioning grooves 42 one by one, and the middle of the positioning sleeve 5 is provided with a central positioning hole for positioning and mounting a workpiece thereon. The positioning groove 42 on the end part of the outer shell 4 and the lug plate 51 arranged on the periphery of the positioning sleeve 5 are arranged, so that the positioning sleeve 5 is conveniently and stably fixed on the outer shell 4, and the positioning precision of a workpiece positioned behind the positioning sleeve 5 is ensured.

In summary, according to the tensioning clamp provided by the embodiment of the invention, the positioning sleeve 5 is arranged on the outer shell 4 of the clamp for positioning and mounting the workpiece thereon, so that the positioning accuracy of the workpiece on the clamp can be improved; the spiral guide groove 71 is arranged in the tensioning shaft 7 arranged on the push plate 3, the guide pin 9 is arranged in the radial through hole 32 of the push plate 3, the guide pin 9 penetrates through the spiral guide groove 71 along the radial direction of the tensioning shaft 7, because the guide pin 9 is simultaneously positioned in the radial through hole 32 and the spiral guide groove 71, in the process that the pull rod 2 drives the push plate 3 and the guide pin 9 to move towards the positioning sleeve 5, the guide pin 9 can move along the guide direction of the spiral guide groove 71, so that the tensioning shaft 7 is driven to rotate around the axial direction of the tensioning shaft, the hook pressing plate 8 fixed on the tensioning shaft 7 rotates inwards along with the tensioning shaft 7 to press a workpiece positioned on the positioning sleeve 5, the rapid clamping after the workpiece is loaded is conveniently realized, and the clamping and positioning efficiency of the workpiece is effectively improved; and the workpiece unloading operation is more convenient.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A tensioning clamp, comprising:

the connecting seat (1) is provided with a mounting through hole which is arranged along the radial direction of the connecting seat;

the pull rod (2) is movably arranged in the mounting through hole along the radial direction of the connecting seat (1);

the push plate (3) is connected to the pull rod (2) and moves along with the pull rod (2); the push plate (3) is provided with a plurality of axial through holes (31) arranged along the axial direction of the push plate, and the push plate (3) is also provided with a plurality of radial through holes (32) arranged along the radial direction of the push plate and penetrating through the axial through holes (31);

one end of the outer shell (4) is connected to the connecting seat (1) and sleeved on the periphery of the push plate (3), and a positioning sleeve (5) for positioning and mounting a workpiece is arranged at one end, opposite to the connecting seat (1), of the outer shell (4);

one end of the tensioning shaft (7) penetrates through an axial through hole (31) of the push plate (3) and is connected to the connecting seat (1), the other end of the tensioning shaft penetrates through the outer shell (4) and is connected with a hook pressing plate (8), and a clamping space for clamping a workpiece is formed between the hook pressing plate (8) and the outer shell (4);

a spiral guide groove (71) is formed in the tensioning shaft (7), a guide pin (9) is arranged in the spiral guide groove (71), and at least one end of the guide pin (9) extends out of an opening of the spiral guide groove (71) and extends into a radial through hole (32) of the push plate (3); pull rod (2) promote the in-process that push pedal (3) moved, uide pin (9) are followed push pedal (3) motion is passed through spiral guide way (71) drive tensioning shaft (7) rotate so that around self axis collude clamp plate (8) internal rotation in order to compress tightly the work piece or outwards rotate in order to loosen the work piece.

2. The tightening clamp as claimed in claim 1, characterized in that the end of the tightening shaft (7) connected with the connecting base (1) is further provided with a mounting hole (72), and the mounting hole (72) is internally provided with an elastic rubber (10); one end of the elastic rubber (10) is connected to the bottom of the mounting hole (72), and the other end of the elastic rubber extends out of the mounting hole (72) and is connected to the connecting seat (1).

3. The tensioning clamp according to claim 1, characterized in that the width of the slot at the location of the helical guide groove (71) is adapted to the diameter of the guide pin (9).

4. The tightening clamp as claimed in claim 1, characterized in that the helical guide groove (71) is a guide through groove provided with openings on opposite sides, and the guide pin (9) extends through the helical guide groove (71) and has two ends respectively protruding from the openings on the two sides of the helical guide groove (71) and protruding into the radial through hole (32) of the push plate (3).

5. The tightening clamp as claimed in claim 1, characterized in that the axial through-holes (31) and the tightening shaft (7) are provided in plurality and are arranged at regular intervals in the circumferential direction of the push plate (3).

6. The tightening clamp as claimed in claim 1, characterized in that the push plate (3) is provided with a stepped hole (33) in the middle, the outer edge of the end of the pull rod (2) extending into the outer shell (4) is matched with the inner edge of the part with small aperture of the stepped hole (33), the end of the pull rod (2) extending into the outer shell (4) is connected with a retainer ring (11), and the outer edge of the retainer ring (11) is matched with the inner edge of the part with large aperture of the stepped hole (33) and blocks the radial through hole (32) on the push plate (3).

7. The tightening clamp as claimed in claim 1, characterized in that a guide rod (12) which is arranged in the same radial direction as the tightening shaft (7) and which penetrates the push plate (3) is connected to the connecting base (1).

8. The tightening clamp as claimed in claim 1, characterized in that the outer edge of the push plate (3) abuts against the inner wall of the outer housing (4), and the inner wall of the outer housing (4) is provided with a stop step structure (41) which abuts against the upper surface of the push plate (3) in order to prevent the push plate (3) from being over-stroked.

9. The tightening clamp as claimed in claim 1, characterized in that the hooking plate (8) is a cam connected to the end of the tightening shaft (7) that projects outside the outer shell (4); when the convex part of the cam rotates towards the central line direction of the positioning sleeve (5), the convex part of the cam is matched with the outer shell (4) to clamp the workpiece.

10. The tightening clamp as claimed in claim 1, characterized in that the end of the outer shell (4) at which the locating sleeve (5) is mounted is provided with a plurality of locating grooves (42), the periphery of the locating sleeve (5) is provided with a plurality of mounting lugs (51) which are matched with the locating grooves (42) one by one, and the middle of the locating sleeve (5) is provided with a central locating hole for locating and mounting the workpiece thereon.