Rotary machining jig for circular upper cover

Abstract

The utility model relates to the field of clamp especially relates to the rotary processing clamp of circular upper cover, including the first bottom plate, the upper end of first bottom plate is connected with second electric cylinder, the utility model discloses utilize the clamping mechanism to the upper cover body clamping fixed, open drive mechanism makes the rotary plate rotate to the appropriate angle, makes the upper cover body be located the appropriate angle, opens the first electric cylinder and makes the upper cover body move to the appropriate position, opens the second electric cylinder and makes the second bottom plate be close to the first bottom plate, utilizes another rotary moving assembly on the second bottom plate to the upper cover body clamping, two rotary moving assemblies synchronous movement, realize the stable rotation of the upper cover body, when blanking, first, release another rotary moving assembly on the second bottom plate to the upper cover body's clamping, move to the right with the second bottom plate, open the first electric cylinder and make the upper cover body move to the loading place, open the guide mechanism and make the guide mechanism move down, and the upper cover body can right blanking, and loading and unloading are relatively convenient.

Description

Technical Field

[0001] This utility model belongs to the field of fixtures, specifically relating to a rotary machining fixture for a circular top cover. Background Technology

[0002] Round top covers are a common type of part, widely used in various equipment and containers. In order to perform efficient multi-faceted machining of round top covers, such as drilling, milling and turning, rotary machining fixtures are usually required.

[0003] Existing rotary machining fixtures mainly fall into two categories: manual rotary fixtures and automatic rotary fixtures. Manual rotary fixtures are simple to operate and have low costs, but their processing efficiency is relatively low and it is difficult to guarantee high precision. Automatic rotary fixtures, on the other hand, can achieve continuous rotation, have high processing efficiency and stable precision, but their structure is complex and their cost is high. Existing rotary machining fixtures are not convenient for quickly and stably clamping and rotating circular top covers, and it is difficult to quickly load and unload circular top covers, which needs further improvement.

[0004] Therefore, a rotary machining fixture for circular top covers is proposed. Existing rotary machining fixtures are inconvenient for quickly and stably clamping and rotating circular top covers, making it difficult to quickly load and unload circular top covers. Utility Model Content

[0005] To overcome the problem that existing rotary machining fixtures are inconvenient for quickly and stably clamping and rotating circular covers, and difficult to quickly load and unload circular covers, a rotary machining fixture for circular covers is proposed.

[0006] The technical solution of this utility model is as follows: a rotary processing fixture for a circular top cover, including a first base plate; a second electric cylinder is fixedly connected to the upper end of the first base plate, and a second base plate is fixedly connected to the right end of the second electric cylinder; a rotary moving component is provided at the upper end of both the first base plate and the second base plate, the two rotary moving components are arranged symmetrically to each other, and a guide mechanism is provided at the upper end of the second base plate.

[0007] The rotating moving assembly includes a support block, a drive mechanism, a rotating plate, a first guide rail, a bracket, and a clamping mechanism. The support block is fixed to the upper end of the first base plate. The drive mechanism is located at the end of the support block away from the second electric cylinder. The rotating plate is mounted on the drive mechanism. The first guide rail is fixed to the side end of the rotating plate. The bracket is fixed to the upper end of the first guide rail. The first electric cylinder is fixed to the bracket. A push block is fixed to the output shaft of the first electric cylinder. An upper clamping block is fixed to the lower end of the push block. The upper clamping block is slidably mounted on the side wall of the first guide rail. The clamping mechanism is located on the upper clamping block and clamps the upper cover body inside the clamping mechanism.

[0008] Preferably, in use, the first electric cylinder is activated to move the push block and the upper clamping block to the loading position. Then, the drive mechanism is activated to rotate the rotating plate, placing the upper cover body in the clamping mechanism and clamping and fixing it. The drive mechanism is then activated to rotate the rotating plate to a suitable angle, positioning the upper cover body at the appropriate angle. The first electric cylinder is then activated to move the upper cover body to the appropriate position. The second electric cylinder is activated to move the second base plate closer to the first base plate, using another rotating moving component on the second base plate to clamp the upper cover body. The two rotating moving components move synchronously to achieve stable rotation of the upper cover body. During unloading, the clamping of the upper cover body by the other rotating moving component on the second base plate is released, and the second base plate is moved to the right. The first electric cylinder is activated to move the upper cover body to the loading position. The guide mechanism is activated to move downward, allowing the upper cover body to be unloaded to the right. This makes unloading and loading more convenient and solves the problem that existing rotary processing fixtures are inconvenient for quickly and stably clamping and rotating circular upper covers, making it difficult to quickly unload and load circular upper covers.

[0009] Preferably, the clamping mechanism includes a fourth electric cylinder, an upper pressure block, a fifth electric cylinder, and a lower pressure block. The upper end of the upper clamping block is fixedly connected to the fourth electric cylinder, and the lower end of the upper clamping block has a first groove. The upper pressure block is slidably arranged on both sides of the inner wall of the first groove. The lower end of the output shaft of the fourth electric cylinder passes through the upper clamping block and is fixedly connected to the upper end of the upper pressure block. The lower end of the upper clamping block is fixedly connected to the lower clamping block. The lower clamping block is L-shaped. The lower end of the lower clamping block is fixedly connected to the fifth electric cylinder. The upper end of the lower clamping block has a second groove, which corresponds to the first groove. The lower pressure block is slidably arranged on both sides of the inner wall of the second groove. The upper end of the output shaft of the fifth electric cylinder passes through the lower clamping block and is fixedly connected to the lower end of the lower pressure block. The upper and lower clamping blocks are fixedly connected to an arc-shaped block at their close ends. The upper end of the arc-shaped block has evenly distributed graduated grooves.

[0010] Preferably, the drive mechanism includes a U-shaped block, a geared motor, a gear ring, a rotating shaft, and a gear; the upper part of the support block away from the second electric cylinder is fixedly connected to the U-shaped block, the side end of the U-shaped block is fixedly connected to the geared motor, the output shaft of the geared motor passes through the wall of the U-shaped block and is fixedly connected to the gear ring, the right end of the U-shaped block is rotatably mounted through the shaft, the left side wall of the shaft is fixedly connected to the gear, the right end of the shaft is fixedly connected to the left end of the rotating plate, and the gear ring and the gear mesh with each other.

[0011] Preferably, the sidewalls of the top cover body and the curved surfaces of the two curved blocks at their closest points are fitted together.

[0012] Preferably, the guiding mechanism includes a third electric cylinder, a second guide rail, a fixing block, and a guide rod; the upper end of the second base plate is fixedly connected to the third electric cylinder and the guide rod, the upper end of the output shaft of the third electric cylinder is fixedly connected to the second guide rail, the side end of the second guide rail is fixedly connected to the fixing block, and the inner wall of the fixing block and the side wall of the guide rod are in contact.

[0013] Preferably, the support block at the upper end of the second base plate and the end of the second guide rail that are close to each other are in contact with each other. The second guide rail and the first guide rail have the same structure. The length of the second guide rail is less than the length of the first guide rail. The length of the first guide rail in the rotating moving assembly at the upper end of the second base plate is less than the length of the first guide rail in the rotating moving assembly at the upper end of the first base plate.

[0014] Preferably, the lower ends of the first base plate and the second base plate are flush. The right end of the first base plate has two limiting holes, which are symmetrical about the second electric cylinder. The left end of the second base plate has two limiting posts fixedly connected to it, which are slidably disposed on the inner wall of the limiting holes.

[0015] The beneficial effects of this utility model are as follows: By activating the first electric cylinder, the push block drives the upper clamping block to move to the loading position. Then, the drive mechanism is activated to rotate the rotating plate, placing the upper cover body in the clamping mechanism and clamping and fixing it. Then, the drive mechanism is activated to rotate the rotating plate to a suitable angle, so that the upper cover body is at a suitable angle. Then, the first electric cylinder is activated to move the upper cover body to a suitable position. The second electric cylinder is activated to move the second base plate closer to the first base plate. The upper cover body is clamped by another rotating moving component on the second base plate. The two rotating moving components move synchronously to achieve stable rotation of the upper cover body. When unloading, the clamping of the upper cover body by the other rotating moving component on the second base plate is released first, and the second base plate is moved to the right. The first electric cylinder is activated to move the upper cover body to the loading position. The guide mechanism is activated to move downward, and the upper cover body can be unloaded to the right. The loading and unloading are more convenient, solving the problem that existing rotary processing jigs are inconvenient for quick and stable clamping and rotation of circular upper covers, and difficult to quickly load and unload circular upper covers. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of the rotary machining fixture for the circular top cover of this utility model.

[0017] Figure 2 The diagram shown is a three-dimensional structural schematic of the rotary moving component of the rotary machining fixture for the circular top cover of this utility model.

[0018] Figure 3 The diagram shown is a three-dimensional structural schematic of the gears in the rotary machining fixture for the circular top cover of this utility model.

[0019] Figure 4 The diagram shows a three-dimensional disassembled structure of the first and second base plates of the rotary machining fixture for the circular top cover of this utility model.

[0020] Figure 5The diagram shown is a three-dimensional structural schematic of the upper clamping block of the rotary machining fixture for the circular top cover of this utility model.

[0021] Figure 6 The diagram shown is a three-dimensional structural schematic of the lower clamping block of the rotary machining fixture for the circular top cover of this utility model.

[0022] Figure 7 The diagram shown is a three-dimensional structural schematic of the guide mechanism of the rotary machining fixture for the circular top cover of this utility model.

[0023] The labels in the attached diagram are as follows: 1. First base plate; 2. Rotary moving assembly; 201. Support block; 202. U-shaped block; 203. Gear motor; 204. Gear ring; 205. Rotating shaft; 206. Gear; 207. Rotating plate; 208. First guide rail; 209. Bracket; 210. First electric cylinder; 211. Push block; 212. Upper clamping block; 3. Second electric cylinder; 4. Second base plate; 5. Guide mechanism; 501. Third electric cylinder; 502. Second guide rail; 503. Fixing block; 504. Guide rod; 6. Upper cover body; 7. Limiting hole; 8. Limiting post; 9. Fourth electric cylinder; 10. First groove; 11. Upper pressure block; 12. Arc-shaped block; 13. Scale groove; 14. Lower clamping block; 15. Second groove; 16. Fifth electric cylinder; 17. Lower pressure block. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Please see Figures 1-7 This utility model provides an embodiment: a rotary processing fixture for a circular top cover, including a first base plate 1; a second electric cylinder 3 is fixedly connected to the upper end of the first base plate 1, and a second base plate 4 is fixedly connected to the right end of the second electric cylinder 3; a rotary moving component 2 is provided at the upper end of both the first base plate 1 and the second base plate 4, and the two rotary moving components 2 are arranged symmetrically to each other; a guide mechanism 5 is provided at the upper end of the second base plate 4.

[0026] The rotating moving assembly 2 includes a support block 201, a drive mechanism, a rotating plate 207, a first guide rail 208, a bracket 209, and a clamping mechanism. The support block 201 is fixedly connected to the upper end of the first base plate 1. The end of the support block 201 away from the second electric cylinder 3 is provided with a drive mechanism. The rotating plate 207 is provided on the drive mechanism. The first guide rail 208 is fixedly connected to the side end of the rotating plate 207. The bracket 209 is fixedly connected to the upper end of the first guide rail 208. The first electric cylinder 210 is fixedly connected to the bracket 209. The push block 211 is fixedly connected to the output shaft of the first electric cylinder 210. The upper clamping block 212 is slidably disposed on the side wall of the first guide rail 208. The clamping mechanism is provided on the upper clamping block 212, and the upper cover body 6 is clamped in the clamping mechanism.

[0027] In use, firstly, the first electric cylinder 210 is activated, causing the push block 211 to move the upper clamping block 212 to the loading position. Then, the drive mechanism is activated, causing the rotating plate 207 to rotate, placing the upper cover body 6 into the clamping mechanism and clamping and fixing it. Then, the drive mechanism is activated, causing the rotating plate 207 to rotate to a suitable angle, so that the upper cover body 6 is at a suitable angle. Then, the first electric cylinder 210 is activated, causing the upper cover body 6 to move to a suitable position. The second electric cylinder 3 is activated, causing the second base plate 4 to move closer to the first base plate 1. The other rotating moving component 2 on the second base plate 4 is used to clamp the upper cover body 6. The two rotating moving components 2 move synchronously to achieve stable rotation of the upper cover body 6. When unloading, first release the clamping of the other rotating moving component 2 on the second base plate 4 from the upper cover body 6, move the second base plate 4 to the right, activate the first electric cylinder 210, causing the upper cover body 6 to move to the loading position, activate the guide mechanism 5, causing the guide mechanism 5 to move downward, and the upper cover body 6 can be unloaded to the right, making loading and unloading more convenient.

[0028] Please see Figure 1 As shown in the figure, in this embodiment, the clamping mechanism includes a fourth electric cylinder 9, an upper pressure block 11, a fifth electric cylinder 16, and a lower pressure block 17. The upper end of the upper clamping block 212 is fixedly connected to the fourth electric cylinder 9, and the lower end of the upper clamping block 212 is provided with a first groove 10. The upper pressure block 11 is slidably provided on both sides of the inner wall of the first groove 10. The lower end of the output shaft of the fourth electric cylinder 9 passes through the upper clamping block 212 and is fixedly connected to the upper end of the upper pressure block 11. The lower end of the upper clamping block 212 is fixedly connected to the lower clamping block 14, which is L-shaped. The lower end of the lower clamping block 14 is fixedly connected to the fifth electric cylinder 16, and the upper end of the lower clamping block 14 is provided with a second groove 15, which corresponds to the first groove 10. The two sides of the inner wall of the second groove 17 are slidably connected to the fifth electric cylinder 16. A lower pressure block 17 is provided for side sliding. The upper end of the output shaft of the fifth electric cylinder 16 passes through the lower clamping block 14 and is fixed to the lower end of the lower pressure block 17. An arc-shaped block 12 is fixed to the end of the upper clamping block 212 and the lower clamping block 14 that are close to each other. The upper end of the arc-shaped block 12 is provided with evenly distributed scale grooves 13. The upper cover body 6 is placed at the end of the upper clamping block 212 and the lower clamping block 14 that are close to each other. Then, the fourth electric cylinder 9 is turned on to make the upper pressure block 11 move downward, and the fifth electric cylinder 16 is turned on to make the lower pressure block 17 move upward. The lower pressure block 17 and the upper pressure block 11 can be used to press and fix the upper cover body 6. By observing the scale grooves 13, it is convenient to adjust the position that needs to be processed on the upper cover body 6.

[0029] Please see Figures 1-3In this embodiment, the driving mechanism includes a U-shaped block 202, a reduction motor 203, a gear ring 204, a rotating shaft 205, and a gear 206. The upper part of the support block 201 away from the second electric cylinder 3 is fixedly connected to the U-shaped block 202. The reduction motor 203 is fixedly connected to the side end of the U-shaped block 202. The output shaft of the reduction motor 203 passes through the wall of the U-shaped block 202 and is fixedly connected to the gear ring 204. The right end of the U-shaped block 202 is rotatably mounted through the rotating shaft 205. The gear 206 is fixedly connected to the left side wall of the rotating shaft 205. The right end of the rotating shaft 205 is fixedly connected to the left end of the rotating plate 207. The gear ring 204 and the gear 206 mesh with each other. When it is necessary to change the angle of the upper cover body 6, the reduction motor 203 is turned on to make the gear ring 204 rotate. The gear ring 204 drives the gear 206 to rotate. The gear 206 drives the rotating plate 207 to rotate, which can quickly adjust the angle of the upper cover body 6.

[0030] Please see Figure 1 and Figure 5 In this embodiment, the sidewall of the upper cover body 6 and the arc surfaces of the two arc blocks 12 that are close to each other fit together, which is conducive to the stable placement of the upper cover body 6.

[0031] Please see Figure 1 and Figure 7 In this embodiment, the guiding mechanism 5 includes a third electric cylinder 501, a second guide rail 502, a fixing block 503, and a guide rod 504. The upper end of the second base plate 4 is fixedly connected to the third electric cylinder 501 and the guide rod 504. The upper end of the output shaft of the third electric cylinder 501 is fixedly connected to the second guide rail 502. The side end of the second guide rail 502 is fixedly connected to the fixing block 503. The inner wall of the fixing block 503 and the side wall of the guide rod 504 are in contact. When it is necessary to load or unload the upper cover body 6, the third electric cylinder 501 is activated to make the second guide rail 502 move downward. In this way, when the upper cover body 6 is pushed by the rotating moving component 2, it is convenient to unload to the right.

[0032] Please see Figure 1 , Figure 2 and Figure 7 In this embodiment, the support block 201 at the upper end of the second base plate 4 and the second guide rail 502 are close to each other at their respective ends. The second guide rail 502 and the first guide rail 208 have the same structure. The length of the second guide rail 502 is less than the length of the first guide rail 208. The length of the first guide rail 208 in the upper rotating and moving assembly 2 of the second base plate 4 is less than the length of the first guide rail 208 in the upper rotating and moving assembly 2 of the first base plate 1. The second guide rail 502 can slide stably along the side end of the support block 201 at the upper end of the second base plate 4. The setting of the guide mechanism 5 facilitates the unloading of the upper cover body 6.

[0033] Please see Figure 1 and Figure 4In this embodiment, the lower end of the first base plate 1 and the lower end of the second base plate 4 are flush. The right end of the first base plate 1 has two limiting holes 7, which are symmetrical about the second electric cylinder 3. The left end of the second base plate 4 is fixed with two limiting posts 8, which are slidably disposed on the inner wall of the limiting holes 7, which facilitates the stable movement of the second base plate 4.

[0034] Working principle: First, the first electric cylinder 210 is turned on, causing the push block 211 to move the upper clamping block 212 to the feeding position. Then, the drive mechanism is turned on, causing the rotating plate 207 to rotate. Specifically, the reduction motor 203 is turned on, causing the gear ring 204 to rotate. The gear ring 204 drives the gear 206 to rotate, and the gear 206 drives the rotating plate 207 to rotate, thereby adjusting the angle of the upper cover body 6.

[0035] The upper cover body 6 is placed in the clamping mechanism and clamped and fixed by the clamping mechanism. Specifically, the upper cover body 6 is placed at one end of the upper clamping block 212 and the lower clamping block 14 that are close to each other. Then, the fourth electric cylinder 9 is turned on to make the upper pressing block 11 move downward and the fifth electric cylinder 16 is turned on to make the lower pressing block 17 move upward. The lower pressing block 17 and the upper pressing block 11 are used to press and fix the upper cover body 6.

[0036] Next, the drive mechanism is activated to rotate the rotating plate 207 to a suitable angle, so that the upper cover body 6 is at a suitable angle. Then, the first electric cylinder 210 is activated to move the upper cover body 6 to a suitable position. The second electric cylinder 3 is activated to move the second base plate 4 closer to the first base plate 1. The upper cover body 6 is clamped by another rotating moving component 2 on the second base plate 4. The two rotating moving components 2 move synchronously to achieve stable rotation of the upper cover body 6.

[0037] After the upper cover body 6 is processed, when unloading, first release the clamping of the upper cover body 6 by another rotating moving component 2 on the second base plate 4, and move the second base plate 4 to the right.

[0038] The first electric cylinder 210 is activated, causing the upper cover body 6 to move to the feeding position;

[0039] The guide mechanism 5 is activated, causing it to move downwards. Specifically, the third electric cylinder 501 is activated, causing the second guide rail 502 to move downwards. This facilitates the material being fed to the right after the upper cover body 6 is pushed.

[0040] When in use, the position on the upper cover body 6 that needs to be processed can be easily adjusted by observing the scale groove 13.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A rotary machining fixture for a circular top cover, comprising a first base plate (1); characterized in that: The upper end of the first base plate (1) is fixedly connected to the second electric cylinder (3), and the right end of the second electric cylinder (3) is fixedly connected to the second base plate (4). The upper ends of the first base plate (1) and the second base plate (4) are both provided with a rotating moving component (2). The two rotating moving components (2) are arranged symmetrically to each other. The upper end of the second base plate (4) is provided with a guide mechanism (5). The rotating moving assembly (2) includes a support block (201), a drive mechanism, a rotating plate (207), a first guide rail (208), a bracket (209), and a clamping mechanism; the support block (201) is fixedly connected to the upper end of the first base plate (1), and a drive mechanism is provided at the end of the support block (201) away from the second electric cylinder (3). A rotating plate (207) is provided on the drive mechanism, and a first guide rail (208) is fixedly connected to the side end of the rotating plate (207). A bracket (209) is fixed to the upper end of the guide rail (208), a first electric cylinder (210) is fixed to the bracket (209), a push block (211) is fixed to the output shaft of the first electric cylinder (210), an upper clamping block (212) is fixed to the lower end of the push block (211), the upper clamping block (212) is slidably disposed on the side wall of the first guide rail (208), and a clamping mechanism is provided on the upper clamping block (212), and the upper cover body (6) is clamped in the clamping mechanism.

2. The rotary machining fixture for a circular top cover according to claim 1, characterized in that: The clamping mechanism includes a fourth electric cylinder (9), an upper pressure block (11), a fifth electric cylinder (16), and a lower pressure block (17). The upper end of the upper clamping block (212) is fixedly connected to the fourth electric cylinder (9), and the lower end of the upper clamping block (212) is provided with a first groove (10). The upper pressure block (11) is slidably provided on both sides of the inner wall of the first groove (10). The lower end of the output shaft of the fourth electric cylinder (9) passes through the upper clamping block (212) and is fixedly connected to the upper end of the upper pressure block (11). The lower end of the upper clamping block (212) is fixedly connected to a lower clamping block (14). The lower clamping block (14) is L-shaped. The lower end of the fifth electric cylinder (16) is fixedly connected to the lower end of the lower clamping block (14). The upper end of the lower clamping block (14) is provided with a second groove (15). The second groove (15) corresponds to the first groove (10). The two sides of the inner wall of the second groove (15) are provided with lower pressing blocks (17). The upper end of the output shaft of the fifth electric cylinder (16) passes through the lower clamping block (14) and is fixedly connected to the lower end of the lower pressing block (17). The upper clamping block (212) and the lower clamping block (14) are close to each other and are jointly fixedly connected with an arc-shaped block (12). The upper end of the arc-shaped block (12) is provided with evenly distributed scale grooves (13).

3. The rotary machining fixture for a circular top cover according to claim 1, characterized in that: The drive mechanism includes a U-shaped block (202), a geared motor (203), a gear ring (204), a rotating shaft (205), and a gear (206). The upper part of the support block (201) away from the second electric cylinder (3) is fixedly connected to the U-shaped block (202). The side end of the U-shaped block (202) is fixedly connected to the geared motor (203). The output shaft of the geared motor (203) passes through the wall of the U-shaped block (202) and is fixedly connected to the gear ring (204). The right end of the U-shaped block (202) is rotatably mounted with the rotating shaft (205). The left side of the rotating shaft (205) is fixedly connected to the gear (206). The right end of the rotating shaft (205) is fixedly connected to the left end of the rotating plate (207). The gear ring (204) and the gear (206) mesh with each other.

4. The rotary machining fixture for a circular top cover according to claim 2, characterized in that: The sidewalls of the upper cover body (6) and the curved surfaces of the two arc-shaped blocks (12) at their closest points are fitted together.

5. The rotary machining fixture for a circular top cover according to claim 1, characterized in that: The guiding mechanism (5) includes a third electric cylinder (501), a second guide rail (502), a fixing block (503), and a guide rod (504); the upper end of the second base plate (4) is fixedly connected to the third electric cylinder (501) and the guide rod (504), the upper end of the output shaft of the third electric cylinder (501) is fixedly connected to the second guide rail (502), the side end of the second guide rail (502) is fixedly connected to the fixing block (503), and the inner wall of the fixing block (503) and the side wall of the guide rod (504) are in contact.

6. The rotary machining fixture for a circular top cover according to claim 5, characterized in that: The support block (201) at the upper end of the second base plate (4) and the second guide rail (502) are close to each other at one end. The second guide rail (502) and the first guide rail (208) are of the same structure. The length of the second guide rail (502) is less than the length of the first guide rail (208). The length of the first guide rail (208) in the upper rotating moving assembly (2) of the second base plate (4) is less than the length of the first guide rail (208) in the upper rotating moving assembly (2) of the first base plate (1).

7. The rotary machining fixture for a circular top cover according to claim 1, characterized in that: The lower end of the first base plate (1) is flush with the lower end of the second base plate (4). Two limiting holes (7) are opened on the right end of the first base plate (1). The two limiting holes (7) are symmetrical about the second electric cylinder (3). Two limiting posts (8) are fixed to the left end of the second base plate (4). The limiting posts (8) are slidably disposed on the inner wall of the limiting holes (7).

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