Anesthetic shaking device

Abstract

The invention relates to the technical field of shaking devices, and discloses an anesthetic medicine shaking device which comprises a fixing frame, a motor is arranged in the fixing frame, a reciprocating rotating mechanism is arranged on an output shaft of the motor, a placing frame is arranged on the reciprocating rotating mechanism, a test tube is placed in the placing frame, a stirring mechanism is arranged in the test tube, and the stirring mechanism is arranged in the placing frame. When the motor rotates, the reciprocating rotating mechanism and the placing frame drive the test tube to reciprocate on the same straight line, and the anesthetic in the test tube is driven to shake left and right, so that the motor rotates to drive the reciprocating rotating mechanism to enable the placing frame and the test tube in the placing frame to reciprocate on the same straight line; the anesthetic can be shaken left and right, the stirring mechanism arranged in the test tube can rotate along with linkage of related parts, the anesthetic in the test tube is stirred and mixed, the two movement modes are combined, the anesthetic can be more fully promoted to be shaken up and mixed, and it is ensured that medicine components are evenly distributed.

Description

Technical Field

[0001] The invention relates to the technical field of shaking devices, in particular to a device for shaking anesthetic drugs. Background Art

[0002] During the preparation, storage or pre-use of anesthetic drugs, it is often necessary to shake the anesthetic drugs to ensure that the drug ingredients are fully mixed and evenly, and to ensure the stability and consistency of its efficacy. The traditional shaking method often relies on manual shaking, which has many problems. On the one hand, manual shaking is difficult to ensure the consistency of shaking force, frequency and amplitude, which can easily lead to uneven shaking effects when different batches or different personnel operate, thus affecting the quality of anesthetic drugs. On the other hand, manual operation is inefficient, especially when a large number of test tube samples need to be processed, which will consume a lot of manpower and time costs.

[0003] With the development of technology, some drug-shaking devices have appeared on the market. However, these devices generally have the problem of single function. Some devices can only achieve shaking movement in a single direction and cannot fully mix the drugs in an all-round way, resulting in insufficient drug shaking. Moreover, during the shaking process, the test tubes containing anesthetic drugs are not fixed firmly enough, and the test tubes are prone to shaking, shifting or even falling off, which not only affects the shaking effect, but also may cause safety hazards such as drug leakage and test tube damage, thereby affecting the normal development of medical work and the safety of the medical environment.

[0004] In addition, some existing devices do not fully consider the compatibility with test tubes of different specifications and the stability of the coordinated work between the various components in their designs, which may lead to problems such as component wear and frequent failures during actual use, reducing the service life and reliability of the device. In summary, there is an urgent need for an anesthetic drug shaking device that can efficiently, stably and fully shake the anesthetic drug, while ensuring that the test tube is firmly placed during the shaking process and that the various components of the device work well together. Summary of the invention

[0005] The purpose of the present invention is to provide an anesthetic drug shaking device to solve the problems raised in the above background technology.

[0006] Technical Solution The present invention provides the following technical solution: an anesthetic drug shaking device, comprising a fixed frame, a motor is arranged in the fixed frame, a reciprocating rotating mechanism is arranged on the output shaft of the motor, a placing frame is arranged on the reciprocating rotating mechanism, a test tube is placed in the placing frame, a stirring mechanism is arranged in the test tube, when the motor rotates, the reciprocating rotating mechanism and the placing frame drive the test tube to reciprocate on the same straight line, drive the anesthetic drug in the test tube to shake left and right, and when the stirring mechanism rotates, the anesthetic drug in the test tube is stirred and mixed.

[0007] Preferably, a telescopic cylinder and a fixed plate are respectively provided in the fixed frame, and a movable plate is fixedly installed on the output shaft of the telescopic cylinder. The movable plate is located above the test tube, and the fixed plate is movably connected to the reciprocating rotating mechanism to ensure that the placement frame always moves left and right within the same linear plane above the fixed plate.

[0008] Preferably, the reciprocating motion mechanism includes a rotating disk, which is fixedly mounted on the output shaft end of the motor, and a second pin is fixedly mounted on the rotating disk, a first pin is fixedly mounted below the placement frame, and a connecting column is movably mounted on the outer sides of the first pin and the second pin.

[0009] Preferably, a first sliding through groove is formed through the fixing plate, and the lower end of the placement frame is located in the first sliding through groove.

[0010] Preferably, a rotating column is movably installed inside the cover plate, a stirring rod is fixedly installed on the outside of the rotating column, the stirring rod is located inside the test tube, and the edge of the stirring rod is in sliding contact with the inner wall of the test tube, and a first rotating gear is fixedly installed on the top of the rotating column.

[0011] Preferably, a gear groove is formed through the interior of the movable plate, and the first rotating gear is located in the gear groove and meshedly connected with a tooth block of the gear groove.

[0012] Preferably, a fixing column, a limit block and a contact block are respectively fixedly installed on the inner wall of the fixed frame, the bottom end of the fixing column is fixedly connected to the limit block, the fixing column passes through the two ends of the movable plate, and the inner wall of the fixed frame is penetrated by a second sliding through groove matching the movable plate, the limit block is located below the movable plate, a contact rod is fixedly installed below the end of the movable plate, the bottom end of the contact rod is in contact with the contact block, and the contact block is connected to the motor through a wire.

[0013] Preferably, a clamping mechanism is provided on the placement frame, and the clamping mechanism includes a clamping plate, a pushing rod, a hinge seat and a clamping rod. The hinge seat is fixedly installed on the placement frame, one end of the clamping rod is movably connected to the hinge seat, and the other end is movably connected to the clamping plate. The clamping plate is in contact with the outer wall of the test tube, and the pushing rod is located on the outside of the clamping rod. When the pushing rod moves upward, the angle between the clamping rod and the placement frame will be changed through the hinge seat, so that the clamping plate is close to the test tube and clamps and fixes the test tube.

[0014] Preferably, a placement slot matching the test tube is provided in the placement frame, a movable block is provided in the placement slot, a first rack column is fixedly mounted on the bottom end of the movable block, and the first rack column extends downward into an inner cavity provided in the placement frame.

[0015] Preferably, a second rotating gear is movably installed in the inner cavity of the placement frame, a second rack column is fixedly installed at the end of the push rod, the first rack column and the second rack column are respectively located on both sides of the second rotating gear, and the first rack column and the second rack column are rotationally symmetrically distributed about the center of the second rotating gear, a fixing rod is fixedly installed in the inner cavity of the placement frame, the fixing rod passes through the push rod, and a sliding through hole matching the push rod is opened through the inner wall of the placement frame.

[0016] Beneficial Effects Compared with the prior art, the present invention provides an anesthetic drug shaking device, which has the following beneficial effects: 1. The anesthetic drug shaking device drives the reciprocating rotating mechanism through the rotation of the motor to make the placement frame and the test tube therein reciprocate in the same straight line, so as to achieve the left and right shaking of the anesthetic drug. The stirring mechanism set in the test tube will rotate with the linkage of related parts to stir and mix the anesthetic drug in the test tube. The combination of the two movement modes can more fully promote the shaking and mixing of the anesthetic drug and ensure the uniform distribution of the drug components.

[0017] 2. The reciprocating motion mechanism of the anesthetic drug shaking device is cleverly coordinated with the rotating disk, pins, connections and other parts, so that the placement frame can move back and forth strictly along the same straight line on the fixed plate, thereby driving the test tube to move left and right regularly and stably, which helps to shake the anesthetic drug more evenly.

[0018] 3. The clamping mechanism provided on the placement frame of the anesthetic drug shaking device can automatically clamp and fix the test tube when the test tube is squeezed by the downward movement of the movable plate by means of the linkage of the movable block, the rack column, the rotating gear and other components after the test tube is placed in place. This effectively prevents the test tube from escaping from the placement frame during the left and right movement, ensures that the test tube is in a stable state during the entire anesthetic drug shaking operation, and ensures that the shaking operation proceeds smoothly.

[0019] 4. The movable plate of the anesthetic drug shaking device can move up and down in the fixed frame through the telescopic cylinder, and the gear groove inside it is meshed and connected with the first rotating gear at the top of the stirring column in the test tube. When the placement frame drives the test tube to move left and right, this structural design can ensure that the first rotating gear can be driven to rotate when the test tube moves, thereby prompting the stirring column to rotate to stir the drug, realizing effective linkage between different components and ensuring the coordinated work of the entire shaking device.

[0020] 5. The anesthetic drug shaking device has fixed columns, limit blocks, contact blocks and other components on the inner wall of the fixed frame. The fixed columns can ensure the stability of the moving direction of the movable plate. The limit blocks and contact blocks cooperate with the movable plate and its auxiliary components to achieve effective control of the operating state of the entire device, ensuring that each component can cooperate accurately during operation, maintaining the stable operation of the device, and thereby ensuring the continuous and stable implementation of the anesthetic drug shaking work.

[0021] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a front view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention without the fixed frame; Figure 3 This is the first perspective of the test tube shaking work of the present invention; Figure 4 The second perspective of the test tube shaking work of the present invention; Figure 5 It is a cross-sectional view of a test tube of the present invention; Figure 6 It is a schematic diagram of the movable plate of the present invention; Figure 7 This is a working principle diagram of the placement frame moving left and right of the present invention; Figure 8 It is a diagram of the connection between the placement frame and the test tube of the present invention; Fig. 9 A cross-sectional view of the frame for placing the present invention; Fig.10It is a partial cross-sectional enlarged view of the placement frame of the present invention.

[0024] Description of reference numerals: In the figure: 1. fixed frame; 2. motor; 3. telescopic cylinder; 4. movable plate; 5. placement frame; 6. test tube; 7. clamping mechanism; 8. fixed plate; 9. fixed column; 10. limit block; 11. contact rod; 12. contact block; 13. wire; 14. rotating disk; 15. connecting column; 16. first pin column; 17. cover plate; 18. rotating column; 19. stirring rod; 20. first rotating gear; 21. gear slot; 22. second pin column; 23. clamping plate; 24. pushing rod; 25. placement slot; 26. movable block; 27. first rack column; 28. second rotating gear; 29. ​​second rack column; 30. fixed rod; 31. sliding through hole; 32. hinge seat; 33. clamping rod. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example: See also Figure 1-Figure 7 The present invention provides a technical solution: an anesthetic drug shaking device, comprising a fixed frame 1, a motor 2 is arranged in the fixed frame 1, a reciprocating rotating mechanism is arranged on the output shaft of the motor 2, a placing frame 5 is movably installed on the reciprocating rotating mechanism, a test tube 6 is placed in the placing frame 5, and a stirring mechanism is arranged in the test tube 6. When the motor 2 rotates, the reciprocating rotating mechanism and the placing frame 5 drive the test tube 6 to reciprocate on the same straight line, so as to drive the anesthetic drug in the test tube 6 to shake left and right, and when the stirring mechanism rotates, the anesthetic drug in the test tube 6 is stirred and mixed.

[0027] In this embodiment, the fixed frame 1 is provided with a telescopic cylinder 3 and a fixed plate 8, respectively. The output shaft of the telescopic cylinder 3 is fixedly mounted with a movable plate 4, which is located above the test tube 6. The fixed plate 8 is movably connected to the reciprocating rotating mechanism to ensure that the placement frame 5 always moves left and right within the same straight line plane above the fixed plate 8. In this embodiment, the reciprocating motion mechanism includes a rotating disk 14, which is fixedly mounted on the output shaft end of the motor 2. A second pin 22 is fixedly mounted on the rotating disk 14, and the second pin 22 is arranged away from the center of the rotating disk 14. A first pin 16 is fixedly mounted below the placement frame 5, and a connecting column 15 is movably mounted on the outer sides of the first pin 16 and the second pin 22.

[0028] In this embodiment, a first sliding groove is formed through the fixing plate 8 , and the lower end of the placement frame 5 is located in the first sliding groove.

[0029] When the motor 2 rotates, it will drive the rotating disk 14 to rotate. When the rotating disk 14 rotates, it will drive the second pin 22 to rotate together. When the second pin 22 rotates, it will drive the connecting column 15 to rotate, and the other end of the connecting column 15 is movably connected to the first pin 16. The first pin shaft 16 is fixedly installed at the bottom end of the placement frame 5, and the bottom end of the placement frame 5 is located in the first sliding groove. In this way, when the connecting rod 5 rotates, it will drive the placement frame 5 to reciprocate on the fixed plate 8, and the placement frame 5 reciprocates on the same straight line on the fixed plate 8, which can drive the test tube 6 to shake back and forth left and right, thereby promoting uniform shaking of the anesthetic drugs.

[0030] In this embodiment, a rotating column 18 is movably installed inside the cover plate 17, a stirring rod 19 is fixedly installed on the outside of the rotating column 18, the stirring rod 19 is located inside the test tube 6, and the edge of the stirring rod 19 is in sliding contact with the inner wall of the test tube 6, and a first rotating gear 20 is fixedly installed on the top of the rotating column 18.

[0031] When the rotating column 18 rotates, the stirring rod 19 can be driven to stir the anesthetic drug in the test tube 6 , thereby further promoting further mixing of the anesthetic drug inside the test tube 6 .

[0032] In this embodiment, a gear groove 21 is formed through the interior of the movable plate 4 . The first rotating gear 20 is located in the gear groove 21 and meshes with the tooth block of the gear groove 21 .

[0033] The placement frame 6 moves left and right on the fixed plate 8, and at the same time drives the test tube 6 to move left and right, and a cover plate 17 is arranged above the test tube 6 in the movable plate 4, and the cover plate 17 is fixed to the outer wall of the test tube 6 by threads, so that the rotating column 18 in the cover plate 17 will rotate in the movable plate 4 through the first rotating gear 20, thereby promoting the rotation of the rotating column 18, and when the rotating column 18 rotates, it will drive the stirring rod 19 to stir the anesthetic drug in the test tube 6.

[0034] In this embodiment, the inner wall of the fixed frame 1 is respectively fixedly installed with a fixed column 9, a limit block 10 and a contact block 12, the bottom end of the fixed column 9 is fixedly connected to the limit block 10, the fixed column 9 passes through the two ends of the movable plate 4, and the inner wall of the fixed frame 1 is penetrated by a second sliding groove matching the movable plate 4, the limit block 10 is located below the movable plate 4, and a contact rod 11 is fixedly installed below the end of the movable plate 4, the bottom end of the contact rod 11 is in contact with the contact block 12, and the contact block 12 is connected to the motor 2 through a wire 13.

[0035] The telescopic cylinder 3 will drive the movable plate 4 to move up and down in the fixed frame 1, and the fixed column 9 will ensure that the moving direction of the movable plate 4 remains stable, while making the gear groove 21 and the first rotating gear 20 engage with each other, ensuring that the test tube 6 can drive the first rotating gear 20 to rotate through the gear groove 21 when moving.

[0036] See also Figure 8-Figure 10 The present invention provides a technical solution: in this embodiment, a clamping mechanism 7 is provided on the placement frame 5, and the clamping mechanism 7 includes a clamping plate 23, a pushing rod 24, a hinge seat 32 and a clamping rod 33. The hinge seat 32 is fixedly installed on the placement frame 5, one end of the clamping rod 33 is movably connected to the hinge seat 32, and the other end is movably connected to the clamping plate 23. The clamping plate 23 contacts the outer wall of the test tube 6, and the pushing rod 24 is located on the outside of the clamping rod 33. When the pushing rod 24 moves upward, the angle between the clamping rod 33 and the placement frame 5 will be changed through the hinge seat 32, so that the clamping plate 23 is close to the test tube 6 and the test tube 6 is clamped and fixed.

[0037] In this embodiment, a placement groove 25 matching the test tube 6 is opened in the placement frame 5, and a movable block 26 is arranged in the placement groove 25. A first rack column 27 is fixedly installed at the bottom end of the movable block 26, and the first rack column 27 extends downward into the inner cavity set in the placement frame 5.

[0038] In this embodiment, a second rotating gear 28 is movably installed in the inner cavity of the placement frame 5, a second rack column 29 is fixedly installed at the end of the push rod 24, the first rack column 27 and the second rack column 29 are respectively located on both sides of the second rotating gear 28, and the first rack column 27 and the second rack column 29 are rotationally symmetrically distributed about the center of the second rotating gear 28, a fixing rod 30 is fixedly installed in the inner cavity of the placement frame 5, the fixing rod 30 passes through the push rod 24, and a sliding through hole 31 matching the push rod 24 is opened through the inner wall of the placement frame 5.

[0039] When the test tube 6 is placed in the placement groove 25, the test tube 6 will drive the test tube 6 to squeeze the movable block 26 downward during the downward movement of the movable plate 4. When the movable plate 26 moves downward, it will drive the first rack column 27 to move downward together. When the first rack column 27 moves downward, it will drive the second rack column 29 to move upward through the second rotating gear 28. At the same time, when the second rack column 29 moves upward, it will drive the push rod 24 to move upward. When the push rod 24 moves upward, it will drive the clamping rod 33 to rotate around the hinge seat 32, and drive the clamping plate 23 to clamp and fix the test tube 6, ensuring that the test tube 6 can remain stable during the left and right movement, preventing the test tube 6 from escaping from the placement frame 5 during the movement, and further ensuring that the test tube 6 remains stable during the shaking of the anesthetic drug.

[0040] The working principle of this embodiment is as follows: when the motor 2 rotates, it will drive the rotating disk 14 to rotate. When the rotating disk 14 rotates, it will drive the second pin 22 to rotate together. When the second pin 22 rotates, it will drive the connecting column 15 to rotate, and the other end of the connecting column 15 is movably connected to the first pin 16. The first pin shaft 16 is fixedly installed at the bottom end of the placement frame 5, and the bottom end of the placement frame 5 is located in the first sliding groove. In this way, when the connecting rod 5 rotates, it will drive the placement frame 5 to reciprocate on the fixed plate 8, and the placement frame 5 reciprocates on the same straight line on the fixed plate 8, which can drive the test tube 6 to shake back and forth left and right, thereby promoting uniform shaking of the anesthetic drug.

[0041] The placement frame 6 moves left and right on the fixed plate 8, and at the same time drives the test tube 6 to move left and right, and a cover plate 17 is arranged above the test tube 6 in the movable plate 4, and the cover plate 17 is fixed to the outer wall of the test tube 6 by threads, so that the rotating column 18 in the cover plate 17 will rotate in the movable plate 4 through the first rotating gear 20, thereby promoting the rotation of the rotating column 18, and when the rotating column 18 rotates, it will drive the stirring rod 19 to stir the anesthetic drug in the test tube 6.

[0042] When the movable plate 4 moves downward, the test tube 6 will be driven to squeeze the movable block 26 downward. When the movable plate 26 moves downward, it will drive the first rack column 27 to move downward together. When the first rack column 27 moves downward, it will drive the second rack column 29 to move upward through the second rotating gear 28. At the same time, when the second rack column 29 moves upward, it will drive the push rod 24 to move upward. When the push rod 24 moves upward, it will drive the clamping rod 33 to rotate around the hinge seat 32, and drive the clamping plate 23 to clamp and fix the test tube 6, ensuring that the test tube 6 can remain stable during the left and right movement, preventing the test tube 6 from escaping from the placement frame 5 during the movement, and further ensuring that the test tube 6 remains stable during the shaking of the anesthetic drug.

[0043] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An anesthetic drug shaking device, comprising a fixing frame (1), characterized in that: The fixed frame (1) is provided with a motor (2), the output shaft of the motor (2) is provided with a reciprocating mechanism, the reciprocating mechanism is provided with a placement frame (5), a test tube (6) is placed in the placement frame (5), and the test tube (6) is provided with a stirring mechanism. When the motor (2) rotates, the reciprocating mechanism and the placement frame (5) drive the test tube (6) to reciprocate on the same straight line, thereby driving the anesthetic drug in the test tube (6) to shake left and right. When the stirring mechanism rotates, the anesthetic drug in the test tube (6) is stirred and mixed.

2. The anesthetic drug shaking device according to claim 1, characterized in that: The fixed frame (1) is provided with a telescopic cylinder (3) and a fixed plate (8), respectively. The output shaft of the telescopic cylinder (3) is fixedly mounted with a movable plate (4), the movable plate (4) is located above the test tube (6), and the fixed plate (8) is movably connected to the reciprocating rotating mechanism to ensure that the placement frame (5) is always kept above the fixed plate (8) and moves left and right within the same linear plane.

3. The anesthetic drug shaking device according to claim 2, characterized in that: The reciprocating mechanism comprises a rotating disk (14), the rotating disk (14) being fixedly mounted on the output shaft end of the motor (2), a second pin (22) being fixedly mounted on the rotating disk (14), a first pin (16) being fixedly mounted below the placement frame (5), and a connecting column (15) being movably mounted on the outer sides of the first pin (16) and the second pin (22).

4. The anesthetic drug shaking device according to claim 3, characterized in that: A first sliding groove is formed through the fixing plate (8), and the lower end of the placement frame (5) is located in the first sliding groove.

5. The anesthetic drug shaking device according to claim 4, characterized in that: It also comprises a cover plate (17), wherein a rotating column (18) is movably installed inside the cover plate (17), a stirring rod (19) is fixedly installed outside the rotating column (18), the stirring rod (19) is located inside the test tube (6), and the edge of the stirring rod (19) is in sliding contact with the inner wall of the test tube (6), and a first rotating gear (20) is fixedly installed at the top end of the rotating column (18).

6. The anesthetic drug shaking device according to claim 5, characterized in that: A gear groove (21) is formed through the interior of the movable plate (4), and the first rotating gear (20) is located in the gear groove (21) and meshes with a tooth block of the gear groove (21).

7. The anesthetic drug shaking device according to claim 6, characterized in that: The inner wall of the fixed frame (1) is respectively fixedly mounted with a fixed column (9), a limit block (10) and a contact block (12); the bottom end of the fixed column (9) is fixedly connected to the limit block (10); the fixed column (9) passes through both ends of the movable plate (4); and a second sliding through groove matching the movable plate (4) is penetrated through the inner wall of the fixed frame (1); the limit block (10) is located below the movable plate (4); a contact rod (11) is fixedly mounted below the end of the movable plate (4); the bottom end of the contact rod (11) contacts the contact block (12); and the contact block (12) is connected to the motor (2) via a wire (13).

8. The anesthetic drug shaking device according to claim 1, characterized in that: The placement frame (5) is provided with a clamping mechanism (7), the clamping mechanism (7) comprising a clamping plate (23), a pushing rod (24), a hinge seat (32) and a clamping rod (33), the hinge seat (32) being fixedly mounted on the placement frame (5), one end of the clamping rod (33) being movably connected to the hinge seat (32), and the other end being movably connected to the clamping plate (23), the clamping plate (23) being in contact with the outer wall of the test tube (6), the pushing rod (24) being located on the outer side of the clamping rod (33), and when the pushing rod (24) moves upward, the angle between the clamping rod (33) and the placement frame (5) is changed through the hinge seat (32), so that the clamping plate (23) is close to the test tube (6), and the test tube (6) is clamped and fixed.

9. The anesthetic drug shaking device according to claim 8, characterized in that: The placement frame (5) is provided with a placement groove (25) matching the test tube (6), and a movable block (26) is provided in the placement groove (25). A first rack column (27) is fixedly mounted at the bottom end of the movable block (26), and the first rack column (27) extends downward into an inner cavity provided in the placement frame (5).

10. The anesthetic drug shaking device according to claim 9, characterized in that: A second rotating gear (28) is movably installed in the inner cavity of the placement frame (5), a second rack column (29) is fixedly installed at the end of the push rod (24), the first rack column (27) and the second rack column (29) are respectively located on both sides of the second rotating gear (28), and the first rack column (27) and the second rack column (29) are rotationally symmetrically distributed about the center of the second rotating gear (28), a fixing rod (30) is fixedly installed in the inner cavity of the placement frame (5), the fixing rod (30) passes through the push rod (24), and a sliding through hole (31) matching the push rod (24) is opened through the inner wall of the placement frame (5).

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