CN111730385B

CN111730385B - Clamping mechanism

Info

Publication number: CN111730385B
Application number: CN202010633451.4A
Authority: CN
Inventors: 朱婷婷; 曹震宇; 曹云; 何晓琳
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2021-06-08
Anticipated expiration: 2040-07-02
Also published as: CN111730385A

Abstract

The invention discloses a clamping mechanism which comprises a shell, wherein a first connecting rod is arranged at one corner in the shell, a fixing pin is arranged at one end of the first connecting rod, one end of the fixing pin is fixedly arranged on the inner wall of one side of the shell, the other end of the fixing pin is connected with one end of the first connecting rod, the connecting point is an A point, the other end of the first connecting rod is rotatably connected with one end of a second connecting rod, the connecting point is a B point, when the second connecting rod and the third connecting rod reach a linear state, the third connecting rod is in contact with a second fine adjustment bolt, a dead point or a non-return point is reached at the moment, an; the connecting rod can reach a dead fixed point self-locking state at a specific position after being in a locking state, and has the characteristic of non-return; the mechanism is suitable for the state of clamping the workpiece after the air source is suddenly lost, the safety of a machine tool, a cutter, the workpiece and personnel is protected, and the mechanism has the characteristics of small occupied space and short required power stroke, so that the mechanism can be more easily arranged in a working table surface and a clamp group.

Description

Clamping mechanism

Technical Field

The invention relates to the field of clamp equipment, in particular to a clamping mechanism.

Background

At present, the industrial automatic pressing device mostly utilizes an air cylinder as a power source to press a workpiece, and the damage and the service life of the air cylinder are reduced due to the influence of severe factors such as dust, solid, liquid and high-temperature cutting and chip removal existing in most working environments after foreign matters enter between a piston rod and a sealing ring which are not protected; most of the existing integral pressing device structures do not achieve the function of large-amplitude swing pressing within a short stroke range, so that the existing working pressing devices are large in whole size, cannot be flexibly distributed in a limited working table, and cannot continuously press after an air source is lost; the current market compaction device has no self-adjusting function; and more working time of the staff is occupied in the actual adjusting and debugging process.

In order to overcome the defects of the existing industrial pressing device, the design of the mechanism can overcome the defects, the modernized industrial level is improved, the energy consumption is reduced, and the layout rate of the limited working table is improved.

Disclosure of Invention

The invention aims to provide a clamping mechanism to solve the problems that the existing industrial automatic pressing device mostly uses an air cylinder as a power source to press a workpiece, and the damage and the service life of the air cylinder are reduced due to the fact that foreign matters enter between a piston rod and a sealing ring which are not protected because of the influence of severe factors such as dust, solid, liquid and high-temperature cutting and chip removal existing in most working environments; most of the existing integral pressing device structures do not achieve the function of large-amplitude swing pressing within a short stroke range, so that the existing working pressing devices are large in whole size, cannot be flexibly distributed in a limited working table, and cannot continuously press after an air source is lost; the current market compaction device has no self-adjusting function; the problem of occupying more working time of staff in the actual adjusting and debugging process.

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

the clamping mechanism comprises a shell, a first connecting rod is arranged at one corner inside the shell, a fixing pin is arranged at one end of the first connecting rod, one end of the fixing pin is fixedly arranged on the inner wall of one side of the shell, the other end of the fixing pin is connected with one end of the first connecting rod, the connecting point is a point A, the other end of the first connecting rod is rotatably connected with one end of the second connecting rod, the connecting point is a point B, a special-shaped pin is arranged in the middle of the second connecting rod, a cylinder body is arranged at the bottom of the shell, a backing plate is arranged between the cylinder body and the shell, two ends of the backing plate are fixedly connected with the shell and the cylinder body respectively, a first fine adjustment bolt is arranged on the shell on one side of the first connecting rod, one end of the first fine adjustment bolt extends into the shell and is in threaded connection with the side wall of the shell, a second fine adjustment bolt is arranged on the shell on one side of the third connecting rod, and one end of the second fine adjustment bolt;

the inside of dysmorphism round pin is provided with T type groove, the inside of cylinder body is provided with the cylinder piston rod, the top of cylinder piston rod is provided with T type connection journal stirrup, T type connection journal stirrup sets up the inside in T type groove on the dysmorphism round pin, the other end of connecting rod two is rotated with the one end of connecting rod three and is connected, and the tie point is the C point, one side of connecting rod three is provided with the pivot, the outside that the both sides lateral wall that the casing was passed at the both ends of pivot stretches out the casing, the fixed bush that is provided with in the pivot, fixed mounting has the actuating lever on the lateral wall of bush, the one end of actuating lever is rotated with the one end of connecting rod three and is connected, the spout has been seted up respectively.

As a further scheme of the invention: the through hole is seted up to the one end of connecting rod one, and the one end setting of fixed pin is in the inside of through hole, and the fixed pin rotates with the through hole and is connected for connecting rod one can rotate along the fixed pin, cooperates with connecting rod two.

As a further scheme of the invention: the both ends of stretching out the pivot in the casing outside are provided with square pole respectively, all overlap on two square poles and are equipped with the compressing tightly pole, and when the pivot rotated, the rotation that realizes compressing tightly the pole was accomplished and is compressed tightly the work.

As a further scheme of the invention: the contact surfaces of the two sliding grooves and the two ends of the special-shaped pin are smooth surfaces, the width dimension of the two sliding grooves is larger than the diameter dimension of the special-shaped pin, the design can meet the requirement that the multi-link mechanism has micro horizontal displacement of the connecting point of the special-shaped pin and the connecting rod in the motion, and the connecting point of the special-shaped pin and the connecting rod in the fine adjustment process generates a small amount of horizontal displacement, so that the piston rod of the air cylinder only needs to keep linear reciprocating motion, and is not influenced by lateral force, the special-shaped pin can slide in the sliding grooves conveniently, and the three connecting rod adjusting.

As a further scheme of the invention: the middle part of the second connecting rod is provided with a through hole, two ends of the special-shaped pin penetrate through the inside of the through hole in the second connecting rod, and the special-shaped pin is rotatably connected with the through hole in the second connecting rod, so that the second connecting rod can rotate along the special-shaped pin, the adjusting effect of the second connecting rod is realized, the position design of the connecting point of the second connecting rod and the special-shaped pin is combined with the arrangement layout design of the whole multiple connecting rods, and the push-pull process of the second connecting rod, which can be completed by external power in the motion direction close to a straight line.

As a further scheme of the invention: and the point A, the point B and the point C are in a regular triangle state, and the pressing rod is in a pressing and fixing state and cannot rotate.

The use method of the clamping mechanism specifically comprises the following steps:

the method comprises the following steps: the piston rod of the air cylinder and the connecting rod II in the mechanism with the T-shaped connecting shaft lug thereof push the special-shaped pin to drive the special-shaped pin to move downwards to drive the connecting rod II in the multi-connecting-rod mechanism to move upwards, the structural connection mode of the connecting rod II, the connecting rod I, the connecting rod III and the driving rod meets the requirement that the center of a pin shaft of the special-shaped pin moves in a state approximate to a true line, the whole connecting rod mechanism is in unfolding motion, in the later stage of the motion, the connecting rod I is in contact with the fine adjustment bolt I, the T-shaped connecting shaft lug and the special-shaped pin move slightly in the later stage, the air cylinder continues to push upwards to promote all pushing force of the air cylinder to be transferred to the driving rod because a sliding chute is larger than the design value of the diameter of the special-shaped pin and already contains displacement size calculation, at the moment, the rotating force borne by the driving rod begins, the connecting rod III is in contact with the fine adjustment bolt II, a dead point or a non-return point is reached, the air cylinder cannot be pushed upwards, and the pressing work is finished;

step two: here, adjusting two trim bolts to position A, B, C at three points in different orientations can result: three-point straight line state with non-return characteristic; the point B is in a triangular state on the AC connecting line and has no non-return characteristic; the triangle state can obtain the fixed locking state of no air supply when B point is in the below of AC line, and the cylinder no longer plays a role, also can adjust the terminal point angle that compresses tightly the pole when adjusting two fine setting bolts, plays the effect of direct adjustment point that compresses tightly.

The invention has the beneficial effects that:

in the invention, a cylinder piston rod and a connecting rod II in a multi-connecting-rod mechanism driven by a T-shaped connecting shaft lug push a special-shaped pin to move upwards, the structural connection mode of the connecting rod II, the connecting rod I, the connecting rod III and a driving rod meets the requirement that the center of a pin shaft of the special-shaped pin moves in a state similar to a true line, the whole connecting rod mechanism is in unfolding motion, in the later stage of the motion, because the connecting rod I is in contact with a fine adjustment bolt I, the T-shaped connecting shaft lug and the special-shaped pin move slightly in the later stage, because a sliding groove is larger than the designed value of the diameter of the special-shaped pin and contains the calculation of the size of the displacement, the cylinder continues to push upwards to promote the driving force of the cylinder to be completely transferred to the driving rod, at the moment, the rotating force borne by the driving rod begins to form a linear state along with the speed of the connecting rod II and the, the connecting rod III is in contact with the fine adjustment bolt II, a dead point or a non-return point is reached, the air cylinder cannot be pushed upwards, and the pressing work is finished; the connecting rod can reach a dead fixed point self-locking state at a specific position after being in a locking state, and has the characteristic of non-return; the device can be adapted to the state that the workpiece is still clamped after the air source is suddenly lost, and the safety of a machine tool, a cutter, the workpiece and personnel is protected;

in the present invention, two trimming bolts are adjusted to make A, B, C three points in different directions, so that: three-point straight line state with non-return characteristic; the point B is in a triangular state on the AC connecting line and has no non-return characteristic; when the point B is positioned below the AC connecting line, a fixed locking state without an air source can be obtained in a triangular state, the cylinder does not work any more, the terminal angle of the compression rod can be adjusted when the two fine adjustment bolts are adjusted, and the effect of directly adjusting the compression point is achieved;

when the air cylinder in the conventional industrial clamp is pulled back by 25.6mm, the opening angle of the pressing rod is 105 degrees, the energy can be directly saved by applying a short stroke in an actual environment, and compared with the existing working pressing device, the energy is saved by more than 40%;

and a protection cylinder: because the mechanism is of a closed structure, the mechanism can effectively protect the internal mechanism and key components of the cylinder, so that the cylinder is always in an ideal working environment, the service life of the cylinder is greatly prolonged until the theoretical service life is reached, and the mechanism is suitable for severe working environments such as high temperature, dust, solid liquid splashing and the like;

and the volume is small: the mechanism has the characteristics of small occupied space and short required power stroke, so that the mechanism can be more easily arranged in a working table and a clamp group.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of the clamping mechanism of the present invention;

FIG. 2 is a schematic view of the internal structure of the housing of the present invention;

FIG. 3 is a schematic view of the structure of the piston rod of the cylinder according to the present invention;

FIG. 4 is a schematic view of the present invention in a compressed and fixed state;

FIG. 5 is a schematic view of the structure of the chute of the present invention;

fig. 6 is a schematic structural view of a second trimming bolt of the present invention.

In the figure: 1. a housing; 2. a cylinder piston rod; 3. t-shaped connecting shaft lugs; 4. a shaped pin; 5. a first connecting rod; 6. a second connecting rod; 7. a third connecting rod; 8. a drive rod; 9. a bushing; 10. a hold down bar; 11. a fixing pin; 12. fine adjustment of a first bolt; 13. a second fine-tuning bolt; 14. a rotating shaft; 15. a cylinder body; 16. a base plate; 17. a chute; 18. a square rod.

Detailed Description

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

As shown in fig. 1 to 6, the clamping mechanism includes a housing 1, a first connecting rod 5 is disposed at one corner of the interior of the housing 1, a fixing pin 11 is disposed at one end of the first connecting rod 5, one end of the fixing pin 11 is fixedly disposed on an inner wall of one side of the housing 1, the other end of the fixing pin 11 is connected with one end of the first connecting rod 5, a connection point is a point a, the other end of the first connecting rod 5 is rotatably connected with one end of a second connecting rod 6, the connection point is a point B, a special-shaped pin 4 is disposed at the middle position of the second connecting rod 6, a cylinder body 15 is disposed at the bottom of the housing 1, a backing plate 16 is disposed between the cylinder body 15 and the housing 1, two ends of the backing plate 16 are respectively fixedly connected with the housing 1 and the cylinder body 15, a first fine adjustment bolt 12 is disposed on the housing 1 at one side of the first connecting rod 5, one end of the first fine, one end of the second fine tuning bolt 13 extends into the shell 1 and is in threaded connection with the side wall of the shell 1.

The special-shaped pin 4 is internally provided with a T-shaped groove, the cylinder body 15 is internally provided with a cylinder piston rod 2, the top end of the cylinder piston rod 2 is provided with a T-shaped connecting shaft lug 3, the T-shaped connecting shaft lug 3 is arranged inside the T-shaped groove on the special-shaped pin 4, the other end of the connecting rod II 6 is rotatably connected with one end of the connecting rod III 7, the connecting point is a point C, one side of the connecting rod III 7 is provided with a rotating shaft 14, two ends of the rotating shaft 14 penetrate through the side walls of two sides of the shell 1 and extend out of the shell 1, the rotating shaft 14 is fixedly provided with a lining 9, the outer side wall of the lining 9 is fixedly provided with a driving rod 8, one end of the driving rod 8 is rotatably connected with one end of the connecting rod III 7, the inner walls of two sides of the shell 1 at two ends of the special-shaped pin 4 are respectively provided with a sliding groove 17, two ends of the special-shaped pin 4 are respectively arranged inside the two sliding, because the structural connection mode of the connecting rod two 6, the connecting rod one 5, the connecting rod three 7 and the driving rod 8 meets the requirement that the center of a pin shaft of the special-shaped pin 4 moves in a state similar to a true line, the whole connecting rod mechanism is in unfolding motion, in the later stage of the motion, because the connecting rod one 5 is in contact with the fine adjustment bolt one 12, the T-shaped connecting shaft lug 3 and the special-shaped pin 4 in the later stage of the motion have micro displacement, because the sliding groove 17 is larger than the designed value of the diameter of the special-shaped pin 4 and already contains displacement dimension calculation, the air cylinder continues to push up to promote the driving force of the air cylinder to be completely transferred to the driving rod 8, the rotating force applied to the driving rod 8 starts to increase in a force value mode along with the slow linear state of the connecting rod two 6 and the connecting rod three 7 until the theoretical infinite, when the connecting rod two 6 and the connecting rod three 7 reach the linear state, the, the air cylinder cannot be pushed upwards, and the pressing work is finished; the connecting rod can reach a dead fixed point (self-locking state) at a specific position after being in a locking state, and has the characteristic of non-return; the device can be adapted to the state that the workpiece is still clamped after the air source is suddenly lost, and the safety of a machine tool, a cutter, the workpiece and personnel is protected; here, adjusting two trim bolts to position A, B, C at three points in different orientations can result: three-point straight line state with non-return characteristic; the point B is in a triangular state on the AC connecting line and has no non-return characteristic; the triangle state can obtain the fixed locking state of no air supply when B point is in the below of AC line, and the cylinder no longer plays a role, also can adjust the terminal point angle that compresses tightly pole 10 when adjusting two fine setting bolts, plays the effect of direct adjustment point that compresses tightly.

A through hole is formed in one end of the first connecting rod 5, one end of the fixing pin 11 is arranged inside the through hole, and the fixing pin 11 is connected with the through hole in a rotating mode, so that the first connecting rod 5 can rotate along the fixing pin 11 and is matched with the second connecting rod 6.

The both ends of the pivot 14 that stretch out the casing 1 outside are provided with square pole 18 respectively, all overlap on two square poles 18 and be equipped with compressing tightly pole 10, and when pivot 14 rotated, the rotation that realizes compressing tightly pole 10 accomplished and compressed tightly the work.

The contact surfaces of the two sliding grooves 17 and the two ends of the special-shaped pin 4 are smooth surfaces, the width size of the two sliding grooves 17 is larger than the diameter size of the special-shaped pin 4, the design can meet the requirement that the connecting point of the special-shaped pin 4 and the connecting rod two 6 in the movement of the multi-link mechanism has micro horizontal displacement, and the connecting point of the special-shaped pin 4 and the connecting rod two 6 generates a small amount of horizontal displacement in the fine adjustment process, so that the piston rod 2 of the air cylinder only needs to keep linear reciprocating motion, and is not influenced by lateral force, the special-shaped pin 4 can slide in the sliding grooves 17 conveniently, and the three connecting.

The through hole is arranged in the middle of the second connecting rod 6, the two ends of the special-shaped pin 4 penetrate through the through hole in the second connecting rod 6, the special-shaped pin 4 is rotatably connected with the through hole in the second connecting rod 6, the second connecting rod 6 can rotate along the special-shaped pin 4, the adjusting effect of the second connecting rod 6 is achieved, the position of the connecting point of the second connecting rod 6 and the special-shaped pin 4 is designed, the arrangement layout design of the whole multiple connecting rods is combined, and the pushing and pulling process of the second connecting rod 6, which can be completed by external power in the motion direction close to a straight line, can be basically met.

The points B, C and C are in the regular triangle state, and the pressing rod 10 is in the pressing and fixing state and cannot rotate.

the method comprises the following steps: the cylinder piston rod 2 and the connecting rod with the T-shaped connecting shaft lug 3 push the special-shaped pin 4 to drive the connecting rod two 6 in the multi-connecting-rod mechanism to move upwards, the structural connection mode of the connecting rod two 6, the connecting rod one 5, the connecting rod three 7 and the driving rod 8 meets the requirement that the pin shaft center of the special-shaped pin 4 moves in a state similar to a true line, the whole connecting rod mechanism is in unfolding motion, in the later stage of the motion, because the connecting rod one 5 is in contact with the fine adjustment bolt one 12, the T-shaped connecting shaft lug 3 and the special-shaped pin 4 move slightly in the later stage, because the sliding groove 17 is larger than the designed value of the diameter of the special-shaped pin 4 and already contains displacement size calculation, the cylinder continues to push upwards, the pushing force of the cylinder is all transferred to the driving rod 8, at the moment, the rotating force borne by the driving rod 8 begins to gradually increase in a force value mode along with the, when the second connecting rod 6 and the third connecting rod 7 reach a linear state, the third connecting rod 7 is in contact with the second fine adjustment bolt 13, a dead point or a non-return point is reached, the air cylinder cannot push upwards, and the pressing work is finished;

step two: here, adjusting two trim bolts to position A, B, C at three points in different orientations can result: three-point straight line state with non-return characteristic; the point B is in a triangular state on the AC connecting line and has no non-return characteristic; the triangle state can obtain the fixed locking state of no air supply when B point is in the below of AC line, and the cylinder no longer plays a role, also can adjust the terminal point angle that compresses tightly pole 10 when adjusting two fine setting bolts, plays the effect of direct adjustment point that compresses tightly.

The working principle of the invention is as follows: when the invention is used, the air cylinder piston rod 2 and the T-shaped connecting shaft lug 3 thereof push the special-shaped pin 4 to drive the connecting rod two 6 in the multi-connecting-rod mechanism to move upwards, the structural connection mode of the connecting rod two 6, the connecting rod one 5, the connecting rod three 7 and the driving rod 8 meets the requirement that the center of the pin shaft of the special-shaped pin 4 moves in a state similar to a true line, the whole connecting rod mechanism is in unfolding motion, in the later stage of the motion, because the connecting rod one 5 is contacted with the fine adjustment bolt one 12, the T-shaped connecting shaft lug 3 and the special-shaped pin 4 move slightly in the later stage of the motion, because the chute 17 is larger than the designed value of the diameter of the special-shaped pin 4 and already contains the calculation of the size of the displacement, the air cylinder continues to push upwards to promote the pushing force of the air cylinder to be completely transferred to the driving rod 8, and at the moment, the rotating force borne, until the theoretical infinity, when the second connecting rod 6 and the third connecting rod 7 reach a linear state, the third connecting rod 7 is contacted with the second fine adjustment bolt 13, and at the moment, a dead point or a non-return point is reached, the air cylinder cannot be pushed upwards, and the pressing work is finished; the connecting rod can reach a dead fixed point (self-locking state) at a specific position after being in a locking state, and has the characteristic of non-return; the device can be adapted to the state that the workpiece is still clamped after the air source is suddenly lost, and the safety of a machine tool, a cutter, the workpiece and personnel is protected;

here, adjusting two trim bolts to position A, B, C at three points in different orientations can result: three-point straight line state with non-return characteristic; the point B is in a triangular state on the AC connecting line and has no non-return characteristic; the triangle state can obtain the fixed locking state of no air supply when B point is in the below of AC line, and the cylinder no longer plays a role, also can adjust the terminal point angle that compresses tightly pole 10 when adjusting two fine setting bolts, plays the effect of direct adjustment point that compresses tightly.

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

And (4) limitation of objects.

Claims

1. The clamping mechanism comprises a shell (1) and is characterized in that a first connecting rod (5) is arranged at one corner inside the shell (1), a fixing pin (11) is arranged at one end of the first connecting rod (5), one end of the fixing pin (11) is fixedly arranged on the inner wall of one side of the shell (1), the other end of the fixing pin (11) is connected with one end of the first connecting rod (5), the connecting point is an A point, the other end of the first connecting rod (5) is rotatably connected with one end of a second connecting rod (6), the connecting point is a B point, a special-shaped pin (4) is arranged in the middle of the second connecting rod (6), a cylinder body (15) is arranged at the bottom of the shell (1), a base plate (16) is arranged between the cylinder body (15) and the shell (1), two ends of the base plate (16) are respectively fixedly connected with the shell (1) and the cylinder body (15), a first fine-tuning bolt, one end of the first fine tuning bolt (12) extends into the shell (1) and is in threaded connection with the side wall of the shell (1), a second fine tuning bolt (13) is arranged on the shell (1) on one side of the third connecting rod (7), and one end of the second fine tuning bolt (13) extends into the shell (1) and is in threaded connection with the side wall of the shell (1);

the special-shaped pin is characterized in that a T-shaped groove is formed in the special-shaped pin (4), a cylinder piston rod (2) is arranged in the cylinder body (15), a T-shaped connecting shaft lug (3) is arranged at the top end of the cylinder piston rod (2), the T-shaped connecting shaft lug (3) is arranged in the T-shaped groove in the special-shaped pin (4), the other end of a second connecting rod (6) is rotatably connected with one end of a third connecting rod (7), the connecting point is a C point, a rotating shaft (14) is arranged on one side of the third connecting rod (7), two ends of the rotating shaft (14) penetrate through the side walls of the two sides of the shell (1) and extend out of the shell (1), a lining (9) is fixedly arranged on the rotating shaft (14), a driving rod (8) is fixedly arranged on the outer side wall of the lining (9), one end of the driving rod (8) is rotatably connected with one end of the third connecting rod (7, two ends of the special-shaped pin (4) are respectively arranged in the two sliding grooves (17).

2. The clamping mechanism as claimed in claim 1, characterized in that one end of the first connecting rod (5) is provided with a through hole, one end of the fixing pin (11) is arranged inside the through hole, and the fixing pin (11) is rotatably connected with the through hole.

3. The clamping mechanism according to claim 1, characterized in that the two ends of the rotating shaft (14) extending out of the housing (1) are respectively provided with a square rod (18), and the two square rods (18) are respectively sleeved with a pressing rod (10).

4. The clamping mechanism according to claim 1, characterized in that the contact surfaces of the two sliding grooves (17) and the two ends of the special-shaped pin (4) are smooth surfaces, and the width dimension of the two sliding grooves (17) is larger than the diameter dimension of the special-shaped pin (4).

5. The clamping mechanism as recited in claim 1, characterized in that a through hole is formed in the middle of the second connecting rod (6), two ends of the special-shaped pin (4) penetrate through the through hole of the second connecting rod (6), and the special-shaped pin (4) is rotatably connected with the through hole of the second connecting rod (6).

6. The clamping mechanism according to claim 1, wherein the points A, B and C are in a regular triangle state, and the pressing rod (10) is in a pressing fixed state and cannot rotate.

7. The clamping mechanism as recited in any of claims 1-6, characterised in that the method of use of the clamping mechanism comprises in particular the steps of:

the method comprises the following steps: the air cylinder piston rod (2) and the connecting rod two (6) in the mechanism with the multi-connecting rod driven by the T-shaped connecting shaft lug (3) to drive the special-shaped pin (4) to move upwards, due to the structural connection mode of the connecting rod two (6), the connecting rod one (5), the connecting rod three (7) and the driving rod (8), the requirement that the pin shaft center of the special-shaped pin (4) moves in a state similar to a true line is met, the whole connecting rod mechanism is in unfolding motion, in the later stage of the motion, due to the contact of the connecting rod one (5) and the fine adjustment bolt one (12), the T-shaped connecting shaft lug (3) and the special-shaped pin (4) in the later stage of the motion have micro displacement, due to the fact that the sliding chute (17) is larger than the diameter value of the special-shaped pin (4), the displacement size calculation is included, the air cylinder continues to push upwards, the driving force of the air cylinder is all transferred to the driving rod (8), and at the moment, the rotating force borne by the driving rod (8 The mode is increased until the theoretical infinity, when the connecting rod II (6) and the connecting rod III (7) reach a linear state, the connecting rod III (7) is contacted with the fine adjustment bolt II (13), a dead point or a non-return point is reached, the air cylinder cannot be pushed upwards, and the pressing work is finished;

step two: here, adjusting two trim bolts to position A, B, C at three points in different orientations can result: three-point straight line state with non-return characteristic; the point B is in a triangular state on the AC connecting line and has no non-return characteristic; when the point B is positioned below the AC connecting line, the triangular state can obtain a fixed locking state without an air source, the air cylinder does not work any more, the terminal angle of the compression rod (10) can be adjusted when two fine adjustment bolts are adjusted, and the effect of directly adjusting the compression point is achieved.