Square film equibiaxial stretching device

Abstract

The application relates to a square film equi-stretching mechanism, which comprises a body, a driving column, a clamping device, a force transmission mechanism and a driving mechanism; one end of the driving column is connected with the clamping device and placed in a first straight groove of the body, the other end of the driving column is connected with a long-hole through hole on the force transmission mechanism and the driving mechanism, a rotating handle on the driving mechanism is rotated, the driving mechanism drives the force transmission mechanism and the clamping device to synchronously slide along the first straight groove; the technical scheme of the application clamps the square film in eight directions, realizes synchronous stretching in the eight directions through two screw holes synchronous push rods, the clamping is reliable, the stretching process is stable, the shape distortion amplitude is small, the structure is simple, and the operation is easy.

Description

Technical Field

[0001] This invention relates to the field of stretching device technology, and specifically to a square membrane equal-ratio stretching device. Background Technology

[0002] In a certain optical experiment, a square flexible transparent film needs to be placed in the device, and the film needs to be stretched synchronously to increase the usable area of ​​the film while maintaining its square shape.

[0003] In the prior art, patent CN102879269A discloses a multi-functional multi-axial loading tensile machine, which consists of a loading platform and multiple tensile mechanisms. Each tensile mechanism includes a connecting seat, an electric cylinder, a support seat, a sensor, and a fixture. The loading platform is provided with an arc-shaped keyway guide rail, and the connecting seat is located on the arc-shaped keyway guide rail and can rotate along the arc-shaped keyway guide rail. The tensile mechanism is fixed on the loading platform, and the support seat is connected to the connecting seat on the tensile mechanism. The support seat is provided with an electric cylinder, which is connected to one end of the sensor. The other end of the sensor is connected to the fixture. The electric cylinder drives the fixture to stretch the sample, and the sensor can record the tensile force in real time. It can perform constant speed tensile or proportional tensile according to actual needs.

[0004] The stretching machine is large and complex. When performing proportional stretching, the speed of the electric cylinders in all directions must be adjusted to be consistent. Moreover, the stretching machine can stretch the film from a maximum of four directions, resulting in a large degree of shape distortion. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of existing stretching machines, such as large size, complex structure and large shape distortion during stretching, so as to provide a square film equal-ratio stretching device.

[0006] A square membrane proportional stretching mechanism includes: a body, a drive column, a clamping device, a force transmission mechanism, and a drive mechanism;

[0007] The upper surface of the main body has a square membrane placement area in the middle. Eight first straight grooves are evenly distributed around the area. Each of the eight first straight grooves has a strip hole. Each of the eight strip holes has a drive post. One end of each of the eight drive posts is fixedly connected to a clamping device. The clamping device slides in the first straight groove. The bottom of the main body has a wide groove extending from one end of the main body to the other end in the middle. The wide groove has two parallel semi-circular grooves. The bottom of the main body also has two parallel semi-circular grooves on two sides in the direction perpendicular to the wide groove.

[0008] The force transmission mechanism includes a straight guide rod, a straight-hole synchronous push rod, a first bushing, and a first bushing pressure block. Two straight-hole synchronous push rods are provided, and they are parallel to each other. Each of the two straight-hole synchronous push rods has a strip-shaped through hole. The two straight-hole synchronous push rods are connected by two straight guide rods, and both ends of each straight guide rod pass through the corresponding straight-hole synchronous push rod and are fixedly connected to the first bushing. Two first bushing pressure blocks are provided, and each of the two first bushing pressure blocks has two semi-circular grooves that mate with the first bushing. The two first bushing pressure blocks are respectively fixedly connected to both ends at the wide groove position at the bottom of the body. The upper surface of the first bushing fits into the semi-circular groove at the wide groove position at the bottom of the body.

[0009] The drive mechanism includes a second bushing, a second bushing pressure block, a spiral hole synchronous push rod, a bidirectional screw, and a right-hand spiral hole synchronous push rod. Two bidirectional screws are provided and are parallel to each other. Each of the two spiral hole synchronous push rods has a strip-shaped through hole. The two spiral hole synchronous push rods are threaded to both ends of the two bidirectional screws. The two bidirectional screws pass through the two spiral hole synchronous push rods and are fixedly connected to the second bushing. One end of each bidirectional screw extends to the outside of the second bushing as a rotating handle. Two second bushing pressure blocks are provided, and each second bushing pressure block has two semi-circular grooves that mate with the second bushing. The two second bushing pressure blocks are fixedly connected to both sides of the bottom of the body in a direction perpendicular to the wide groove. The upper surface of the second bushing fits into the semi-circular grooves on both sides of the bottom of the body in a direction perpendicular to the wide groove.

[0010] The other ends of the four drive columns pass through the strip-shaped through holes of the synchronous push rod and extend into the strip-shaped through holes on the spiral synchronous push rod. The other ends of two drive columns extend directly into the strip-shaped through holes on the spiral synchronous push rod, and the other ends of the other two drive columns pass through the strip-shaped through holes of the synchronous push rod.

[0011] Furthermore, the body has a square structure, and the eight first straight slots include four long straight slots and four short straight slots, wherein the four long straight slots and four short straight slots are arranged alternately, the four long straight slots are arranged in the direction of the diagonal of the body, and the four short straight slots are arranged in the direction perpendicular to the four sides of the body.

[0012] The clamping device includes a long clamping device and a short clamping device, wherein the long clamping device is placed in a long straight groove and the short clamping device is placed in a short straight groove.

[0013] Furthermore, the long clamping device includes a long clamping plate and a long slider. The long clamping plate is connected to the long slider through a cylindrical pin. The long clamping plate rotates around the cylindrical pin and cooperates with the long slider to complete the clamping action.

[0014] The short clamping device includes a short clamping plate and a short slider. The short clamping plate is connected to the short slider through a cylindrical pin. The short clamping plate rotates around the cylindrical pin and cooperates with the short slider to complete the clamping action.

[0015] Furthermore, the long clamping plate, the long slider, the short clamping plate, and the short slider are all provided with anti-slip teeth. The anti-slip teeth on the long clamping plate and the anti-slip teeth on the long slider cooperate with each other, and the anti-slip teeth on the short clamping plate and the anti-slip teeth on the short slider cooperate with each other.

[0016] Furthermore, the long clamping plate, the long slider, the short clamping plate, and the short slider are all provided with threaded holes.

[0017] Furthermore, the mechanism also includes a cover with eight second straight grooves. The cover is fixed to the upper surface of the body, and the positions of the second straight grooves correspond to the positions of the first straight grooves.

[0018] Furthermore, the clamping device is fixed to the drive column by countersunk screws.

[0019] Furthermore, the two rotary handles are located on the same side.

[0020] Furthermore, the eight drive posts are respectively designated as the first drive post, the second drive post, the third drive post, the fourth drive post, the fifth drive post, the sixth drive post, the seventh drive post, and the eighth drive post. The other ends of the first drive post, the third drive post, the sixth drive post, and the eighth drive post pass through the strip-shaped through hole of the synchronous push rod and extend into the strip-shaped through hole on the spiral synchronous push rod. The other ends of the fourth drive post and the fifth drive post extend directly into the strip-shaped through hole on the spiral synchronous push rod. The other ends of the second drive post and the seventh drive post pass through the strip-shaped through hole of the synchronous push rod.

[0021] The technical solution of this invention clamps the square membrane in eight directions and achieves synchronous stretching in eight directions through two threaded hole synchronous push rods. The clamping is reliable, the stretching process is stable, and the shape distortion is small. The structure is simple and easy to operate. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is an exploded view of the present invention;

[0024] Figure 2 This is a secondary exploded view of the present invention;

[0025] Figure 3 This is a schematic diagram of the invention after installation;

[0026] Figure 4 This is a schematic diagram illustrating the operation of the present invention;

[0027] Figure 5 This is a top view of the present invention;

[0028] Figure 6 This is a cross-sectional view of the drive mechanism;

[0029] Figure 7 This is a cross-sectional view of the force transmission mechanism;

[0030] Figure 8 This is a schematic diagram of the clamping device and the drive column;

[0031] Figure 9 This is a cross-sectional view of the clamping device and the drive column;

[0032] Figure 10 This is a schematic diagram showing the clamping device placed between the main body and the cover;

[0033] Figure 11 This is a schematic diagram of the clamping device for clamping the membrane;

[0034] Explanation of reference numerals in the attached figures:

[0035] 1-Cap; 2-Long clip; 3-Long slider;

[0036] 4-Short clip; 5-Short slider; 6-Main body;

[0037] 7-Drive column; 7a-First drive column; 7b-Second drive column;

[0038] 7c - Third drive column; 7d - Fourth drive column; 7e - Fifth drive column;

[0039] 7f - Sixth drive column; 7g - Seventh drive column; 7h - Eighth drive column;

[0040] 8-Straight guide rod; 9-Straight hole synchronous push rod; 10-1-First bushing;

[0041] 10-2-Second bushing; 11-1-First bushing clamping block; 11-2-Second bushing clamping block;

[0042] 12-Left-hand threaded synchronous push rod; 13-Double-acting screw; 14-Right-hand threaded synchronous push rod;

[0043] 15-Screw A; 16-Cylindrical pin; 17-Counterhead screw;

[0044] 18-Screw B; 0-Membrane; Detailed Implementation

[0045] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] Please see Figures 1 to 11 A square membrane proportional stretching mechanism includes: a body 6, a drive column 7, a clamping device, a force transmission mechanism and a drive mechanism.

[0050] The upper surface of the body 6 has a square membrane placement area in the middle. Eight first straight grooves are evenly distributed around the area. Each of the eight first straight grooves has a strip hole. Each of the eight strip holes has a drive post 7. One end of each of the eight drive posts 7 is fixedly connected to a clamping device. The clamping device slides in the first straight groove a. The bottom of the body 6 has a wide groove extending from one end of the body 6 to the other end in the middle. The wide groove has two parallel semi-circular grooves. The bottom of the body 6 also has two parallel semi-circular grooves on two sides in the direction perpendicular to the wide groove.

[0051] The force transmission mechanism includes a straight guide rod 8, a straight hole synchronous push rod 9, a first bushing 10-1, and a first bushing pressure block 11-1. Two straight hole synchronous push rods 9 are provided, and they are parallel to each other. Each straight hole synchronous push rod 9 has a strip-shaped through hole. The two straight hole synchronous push rods 9 are connected by two straight guide rods 8, and both ends of the two straight guide rods 8 pass through the corresponding straight hole synchronous push rod 9 and are fixedly connected to the first bushing 10-1. Two first bushing pressure blocks 11-1 are provided, and each first bushing pressure block 11-1 has two semi-circular grooves that mate with the first bushing 10-1. The two first bushing pressure blocks 11-1 are respectively fixedly connected to both ends at the wide groove position at the bottom of the body 6. The upper surface of the first bushing 10-1 fits against the semi-circular groove at the wide groove position at the bottom of the body 6.

[0052] The drive mechanism includes a second bushing 10-2, a second bushing pressure block 11-2, a spiral-hole synchronous push rod 12, a double-ended screw 13, and a right-hand spiral-hole synchronous push rod 14. Two double-ended screws 13 are provided and are parallel to each other. Each of the two spiral-hole synchronous push rods 12 has a strip-shaped through hole. The two spiral-hole synchronous push rods 12 are threaded to both ends of the two double-ended screws 13, and the two double-ended screws 13 pass through the two spiral-hole synchronous push rods 12 and are fixedly connected to the second bushing 10-2. One end of the rod 13 extends to the outside of the second bushing 10-2 as a rotating handle. There are two second bushing pressure blocks 11-2, and each of the two second bushing pressure blocks 11-2 has two semi-circular grooves that cooperate with the second bushing 10-2. The two second bushing pressure blocks 11-2 are fixed to the bottom of the body 6 in the direction of horizontal perpendicularity to the wide groove. The upper surface of the second bushing 10-2 fits into the semi-circular grooves on both sides of the bottom of the body 6 in the direction of horizontal perpendicularity to the wide groove.

[0053] The other ends of the four drive pins 7 pass through the strip-shaped through holes of the synchronous push rod 9 and extend into the strip-shaped through holes on the spiral synchronous push rod 12. The other ends of two drive pins 7 extend directly into the strip-shaped through holes on the spiral synchronous push rod 12, and the other ends of the other two drive pins 7 pass through the strip-shaped through holes of the synchronous push rod 9.

[0054] The body 6 has a square structure, and the eight first straight slots include four long straight slots and four short straight slots. The four long straight slots and four short straight slots are arranged alternately. The four long straight slots are arranged in the direction of the diagonal of the body, and the four short straight slots are arranged in the direction perpendicular to the four sides of the body 6.

[0055] The clamping device includes a long clamping device and a short clamping device, wherein the long clamping device is placed in a long straight groove and the short clamping device is placed in a short straight groove.

[0056] The long clamping device includes a long clamping plate 2 and a long slider 3. The long clamping plate 2 is connected to the long slider 3 through a cylindrical pin 16. The long clamping plate 2 rotates around the cylindrical pin 16 and cooperates with the long slider 3 to complete the clamping action.

[0057] The short clamping device includes a short clamping piece 4 and a short slider 5. The short clamping piece 4 is connected to the short slider 5 through a cylindrical pin 16. The short clamping piece 4 rotates around the cylindrical pin 16 and cooperates with the short slider 5 to complete the clamping action.

[0058] The long clamp 2, long slider 3, short clamp 4, and short slider 5 are all provided with anti-slip teeth. The anti-slip teeth on the long clamp 2 and the anti-slip teeth on the long slider 3 cooperate with each other, and the anti-slip teeth on the short clamp 4 and the anti-slip teeth on the short slider 5 cooperate with each other.

[0059] The long clamping piece 2, the long slider 3, the short clamping piece 4, and the short slider 5 are all provided with threaded holes.

[0060] The mechanism also includes a cover 1, which has eight second straight grooves. The cover 1 is fixed to the upper surface of the body 6 by screws A15, and the positions of the second straight grooves correspond to the positions of the first straight grooves.

[0061] The clamping device is fixed to the drive column 7 by countersunk screws 17.

[0062] The two rotary handles are located on the same side.

[0063] The eight drive posts 7 are respectively designated as the first drive post 7a, the second drive post 7b, the third drive post 7c, the fourth drive post 7d, the fifth drive post 7e, the sixth drive post 7f, the seventh drive post 7g, and the eighth drive post 7h. The other ends of the first drive post 7a, the third drive post 7c, the sixth drive post 7f, and the eighth drive post 7h pass through the strip-shaped through hole of the synchronous push rod 9 and extend into the strip-shaped through hole on the spiral synchronous push rod 12. The other ends of the fourth drive post 7d and the fifth drive post 7e extend directly into the strip-shaped through hole on the spiral synchronous push rod 12. The other ends of the second drive post 7b and the seventh drive post 7g pass through the strip-shaped through hole of the synchronous push rod 9.

[0064] Installation process: First, assemble the short clamping device and the long clamping device. Connect the short clamping piece 4 to the short slider 5 through the cylindrical pin 16 so that the short clamping piece 4 can rotate relative to the short slider 5. Fix the drive column 7 below the short slider 5 through the countersunk screw 17. The long clamping device is assembled in the same way.

[0065] The short clamping device and the long clamping device are assembled and placed into the short straight groove and the long straight groove of the main body 6 respectively. Then, the second straight groove on the cover 1 is aligned with the first straight groove and fixed with screw A15 to form a closed channel. The clamping device can move back and forth in the closed channel, but cannot move up and down.

[0066] Two straight-hole synchronous push rods 9 are fitted onto two straight guide rods 8. The two ends of the straight guide rods 8 are respectively fitted into the first bushings 10-1. The strip-shaped through holes on the two straight-hole synchronous push rods 9 are aligned with the three drive posts 7 and fitted in, one corresponding to 7a, 7b, and 7c, and the other corresponding to 7f, 7g, and 7h. The entire assembly is pressed onto the two ends of the wide groove at the bottom of the main body 2 by the two first bushing pressure blocks 11-1 and fixed by screws B18.

[0067] Two bidirectional screws 13 are screwed into the left-hand screw hole synchronous push rod 12 and the right-hand screw hole synchronous push rod 14 from both sides. The two bidirectional screws 13 are fitted into the bushings 10 at both ends. One end of the two bidirectional screws 13 passes through the bushing 10 as a rotating handle. The strip-shaped through holes on the left-hand screw hole synchronous push rod 12 and the right-hand screw hole synchronous push rod 14 are aligned with the three drive posts 7 and fitted in. One corresponds to 7a, 7d, and 7f, and the other corresponds to 7c, 7e, and 7h. The entire assembly is pressed onto the two sides of the bottom of the main body (2) in a direction that is horizontal and perpendicular to the wide groove through the two second bushing pressure blocks 11-2, and fixed by screws B18.

[0068] Working principle: The rotating handle extending from the rotating bidirectional screw 13 can drive the left-hand screw hole synchronous push rod 12 and the right-hand screw hole synchronous push rod 14 to move outward synchronously through the thread, thereby driving the two sets of drive columns (7a, 7d, 7f) and (7c, 7e, 7h) in the strip-shaped through hole and the clamping device to move outward synchronously along their respective first straight grooves of the main body 2.

[0069] When the above six drive columns move, since 7a, 7b, and 7c are in one strip-shaped through hole, and 7f, 7g, and 7h are in another strip-shaped through hole, 7a and 7c push the straight hole synchronous push rod 9 to move outward, forcing 7b to move together; similarly, 7g moves together with 7f and 7h; therefore, the eight drive columns 7 and the corresponding clamping devices move outward synchronously, and the three adjacent drive columns 7 are in a straight line, maintaining a square outline.

[0070] By simultaneously rotating the rotating handles extending from the two bidirectional screws 13 counterclockwise, the eight clamping devices are brought closer together and the clamping plates are opened. The membrane 0 is placed in the center, and the eight edge parts are placed on the anti-slip teeth of the slider head. The clamping plates are pressed and fixed with screws. By simultaneously rotating the rotating handles extending from the two bidirectional screws 13 clockwise, the clamping devices can be driven to stretch the membrane proportionally.

[0071] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A square membrane proportional stretching mechanism, characterized in that, include: Body (6), drive column (7), clamping device, force transmission mechanism and drive mechanism; The upper surface of the body (6) has a square membrane placement area in the middle. Eight first straight grooves are evenly distributed around the area. Each of the eight first straight grooves has a strip hole. Each of the eight strip holes has a drive post (7). One end of each of the eight drive posts (7) is fixedly connected to a clamping device. The clamping device slides in the first straight groove. The bottom of the body (6) has a wide groove extending from one end of the body (6) to the other end in the middle. The wide groove has two parallel semi-circular grooves. The bottom of the body (6) also has two parallel semi-circular grooves on two sides in the direction perpendicular to the wide groove. The force transmission mechanism includes a straight guide rod (8), a straight hole synchronous push rod (9), a first bushing (10-1), and a first bushing pressure block (11-1); there are two straight hole synchronous push rods (9), and they are parallel to each other. Both straight hole synchronous push rods (9) are provided with strip-shaped through holes. The two straight hole synchronous push rods (9) are connected by two straight guide rods (8), and both ends of the two straight guide rods (8) pass through the corresponding straight hole synchronous push rods (9) and are fixedly connected to the first bushing (10-1); there are two first bushing pressure blocks (11-1), and both first bushing pressure blocks (11-1) are provided with two semi-circular grooves that cooperate with the first bushing (10-1). The two first bushing pressure blocks (11-1) are respectively fixedly connected to the two ends of the wide groove position at the bottom of the body (6). The upper surface of the first bushing (10-1) is in contact with the semi-circular groove at the wide groove position at the bottom of the body (6); The drive mechanism includes a second bushing (10-2), a second bushing pressure block (11-2), a spiral-hole synchronous push rod (12), a double-ended screw (13), and a right-hand spiral-hole synchronous push rod (14). Two double-ended screws (13) are provided and are parallel to each other. Each of the two spiral-hole synchronous push rods (12) has a strip-shaped through hole. The two spiral-hole synchronous push rods (12) are threaded to both ends of the two double-ended screws (13), and the two double-ended screws (13) pass through the two spiral-hole synchronous push rods (12) and are fixedly connected to the second bushing (10-2). One end of the bidirectional screw (13) extends to the outside of the second bushing (10-2) as a rotating handle. There are two second bushing pressure blocks (11-2), and each of the two second bushing pressure blocks (11-2) has two semi-circular grooves that cooperate with the second bushing (10-2). The two second bushing pressure blocks (11-2) are fixed to the bottom of the body (6) in the direction of horizontal perpendicularity to the wide groove. The upper surface of the second bushing (10-2) fits into the semi-circular grooves on both sides of the bottom of the body (6) in the direction of horizontal perpendicularity to the wide groove. The other ends of the four drive pins (7) pass through the strip-shaped through hole of the synchronous push rod (9) and extend into the strip-shaped through hole on the spiral hole synchronous push rod (12). The other ends of two drive pins (7) extend directly into the strip-shaped through hole on the spiral hole synchronous push rod (12). The other ends of the other two drive pins (7) pass through the strip-shaped through hole of the synchronous push rod (9).

2. The mechanism according to claim 1, characterized in that, The body (6) is a square structure. The eight first straight slots include four long straight slots and four short straight slots. The four long straight slots and four short straight slots are arranged alternately. The four long straight slots are arranged in the direction of the diagonal of the body, and the four short straight slots are arranged in the direction perpendicular to the four sides of the body (6). The clamping device includes a long clamping device and a short clamping device, wherein the long clamping device is placed in a long straight groove and the short clamping device is placed in a short straight groove.

3. The mechanism according to claim 2, characterized in that, The long clamping device includes a long clamping plate (2) and a long slider (3). The long clamping plate (2) is connected to the long slider (3) through a cylindrical pin (16). The long clamping plate (2) rotates around the cylindrical pin (16) and cooperates with the long slider (3) to complete the clamping action. The short clamping device includes a short clamping piece (4) and a short slider (5). The short clamping piece (4) is connected to the short slider (5) through a cylindrical pin (16). The short clamping piece (4) rotates around the cylindrical pin (16) and cooperates with the short slider (5) to complete the clamping action.

4. The mechanism according to claim 3, characterized in that, The long clamp (2), long slider (3), short clamp (4) and short slider (5) are all provided with anti-slip teeth. The anti-slip teeth on the long clamp (2) and the anti-slip teeth on the long slider (3) cooperate with each other, and the anti-slip teeth on the short clamp (4) and the anti-slip teeth on the short slider (5) cooperate with each other.

5. The mechanism according to claim 4, characterized in that, The long clamping plate (2), the long slider (3), the short clamping plate (4), and the short slider (5) are all provided with threaded holes.

6. The mechanism according to claim 1, characterized in that, The mechanism also includes a cover (1) with eight second straight grooves. The cover (1) is fixed to the upper surface of the body (6), and the positions of the second straight grooves correspond to the positions of the first straight grooves.

7. The mechanism according to claim 1, characterized in that, The clamping device is fixed to the drive column (7) by countersunk screws (17).

8. The mechanism according to claim 1, characterized in that, The two rotary handles are located on the same side.

9. The mechanism according to claim 1, characterized in that, The eight drive posts (7) are respectively designated as the first drive post (7a), the second drive post (7b), the third drive post (7c), the fourth drive post (7d), the fifth drive post (7e), the sixth drive post (7f), the seventh drive post (7g), and the eighth drive post (7h). The other ends of the first drive post (7a), the third drive post (7c), the sixth drive post (7f), and the eighth drive post (7h) pass through the strip-shaped through hole of the synchronous push rod (9) and extend into the strip-shaped through hole on the spiral hole synchronous push rod (12). The other ends of the fourth drive post (7d) and the fifth drive post (7e) extend directly into the strip-shaped through hole on the spiral hole synchronous push rod (12). The other ends of the second drive post (7b) and the seventh drive post (7g) pass through the strip-shaped through hole of the synchronous push rod (9).

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