Plastic tensile testing device based on intelligent sensor

Abstract

The invention relates to the technical field of plastic tensile testing, in particular to a plastic tensile testing device based on an intelligent sensor, which comprises an equipment frame, positioning frames are fixedly connected to two ends of the equipment frame, a motor frame is fixedly connected to one end of each positioning frame, and a turnover motor is arranged in each motor frame. One end of the overturning motor is fixedly connected with a rotating roller, an overturning frame is arranged in the equipment frame, a control panel is arranged on the side face of the overturning frame, the top end of the overturning frame is fixedly connected with a first detection frame, and the bottom end of the overturning frame is fixedly connected with a second detection frame. According to the equipment, continuous and efficient feeding and discharging plastic tensile test operation based on the intelligent sensor is carried out, in the actual use process, the tensile test operation from a detection sliding base in the first detection frame to the two ends is adaptively carried out, and more accurate tensile test data can be obtained at a sensor body in the center of the interior of an electric sliding rail.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic tensile testing, and specifically to a plastic tensile testing device based on intelligent sensors. Background Technique

[0002] The plastic tensile property test is an important experimental method for evaluating the mechanical properties of plastic materials under tensile loads, and plays a key role in multiple fields such as plastic R & D, quality control, and application selection. From the perspective of the test principle, the plastic tensile property test is based on mechanical principles such as Hooke's law. By applying an axial tensile force to a plastic specimen, it causes deformation, and at the same time, synchronously measures the force and the corresponding deformation data to analyze the behavior of the material during the tensile process. The tensile property test has strict requirements for the shape and size of the specimen. Common specimen shapes include dumbbell-shaped and rectangular. Different plastic products and test standards have clear regulations on the specific dimensions of the specimen, which can ensure the comparability and accuracy of the test results. During the test, first, a plastic specimen that meets the standards needs to be prepared, and its appearance is inspected to ensure a flat surface and no defects. When the stress reaches a certain value, the specimen enters the yield stage, where the stress remains basically unchanged while the strain increases sharply, and obvious yield phenomena appear on the surface. After passing the yield point, the specimen enters the strengthening stage. To continue deforming the specimen, the tensile force needs to be continuously increased. At this time, the internal structure of the material changes and the strength increases. With the continuation of the tensile process, necking phenomena will occur at a certain part of the specimen, where the cross-sectional area rapidly decreases and the load-bearing capacity drops, and finally the specimen is broken.

[0003] For example, the patent document with the publication number CN 119043874 B discloses a fluoroplastic tensile strength testing device, which relates to the technical field of tensile strength testing; and the present invention includes a testing machine main body. A clamping mechanism for cooperation is provided inside the testing machine main body, and a receiving sink is opened at the lower end of the testing machine main body. A supporting mechanism for cooperation is provided in the receiving sink, and a fixing mechanism for cooperation with the supporting mechanism is provided on the testing machine main body. A stabilizing mechanism for cooperation with the testing machine main body is provided inside the supporting mechanism; the setting and use of the clamping mechanism can drive the first side rod and the second side rod to rotate synchronously, thereby driving the clamping outer frame and the clamping ring frame to rotate synchronously, and further facilitating the position conversion of the clamping outer frame and the clamping ring frame, so that the sheet-shaped fluoroplastic parts to be tested and the tubular fluoroplastic parts to be tested can be conveniently fixed according to the test requirements. Compared with the traditional device that can only fix a single sheet-shaped fluoroplastic part to be tested, the present application effectively improves the practicability and functionality of the testing device.

[0004] However, during the actual use of this structure, due to the limitations of its own structure, it can often only perform simple fixed installation of plastic materials during tensile testing, and then cooperate with intelligent sensors to monitor data during tensile testing. As a result, the device needs to perform the loading and unloading operations of plastic materials one by one, and thus cannot perform rapid loading and unloading operations of plastic materials, affecting the daily plastic tensile testing efficiency and unable to complete the testing operations continuously and efficiently. At the same time, the device also cannot perform an overall sealing test operation for adaptation, so it cannot ensure the anti-interference ability of the overall device testing, cannot achieve a more efficient plastic tensile testing operation based on intelligent sensors, and cannot meet the daily use requirements. Therefore, it is urgent to design a plastic tensile testing device based on intelligent sensors to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a plastic tensile testing device based on intelligent sensors to solve the problems presented in the above background technology. During the actual use of the existing structure, due to the limitations of its own structure, it can often only perform simple fixed installation of plastic materials during tensile testing, and then cooperate with intelligent sensors to monitor data during tensile testing. As a result, the device needs to perform the loading and unloading operations of plastic materials one by one, and thus cannot perform rapid loading and unloading operations of plastic materials, affecting the daily plastic tensile testing efficiency and unable to complete the testing operations continuously and efficiently. At the same time, the device also cannot perform an overall sealing test operation for adaptation, so it cannot ensure the anti-interference ability of the overall device testing, cannot achieve a more efficient plastic tensile testing operation based on intelligent sensors, and cannot meet the daily use requirements.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A plastic tensile testing device based on intelligent sensors, including an equipment frame. Both ends of the equipment frame are fixedly connected with positioning frames. One end of the positioning frame is fixedly connected with a motor frame. A turning motor is arranged inside the motor frame. One end of the turning motor is fixedly connected with a rotating roller. An overturning frame is arranged inside the equipment frame. A control panel is arranged on the side of the overturning frame. A first detection frame is fixedly connected to the top end of the overturning frame. A second detection frame is fixedly connected to the bottom end of the overturning frame. An electric slide rail is arranged between the first detection frame and the second detection frame. A sensor body is arranged vertically at the center inside the electric slide rail. The other end of the positioning frame is fixedly connected with a suction frame; A docking seat. The upper and lower ends of the equipment frame are fixedly connected with docking seats. One end of the docking seat is fixedly connected with a storage seat. One end of the storage seat is fixedly connected with a gas control pump. A top ventilation frame is fixedly connected to the side of the upper storage seat. One end of the top ventilation frame is fixedly connected with a gas control pipe frame. A lifting airbag is arranged on the inner wall of the gas control pipe frame.

[0007] Preferably, a lower ventilation frame is fixedly connected to the side of the storage base at the bottom. A support base is fixedly connected to the bottom end of the lower ventilation frame. The upper ventilation frame and the lower ventilation frame are adapted to each other.

[0008] Preferably, an upper arc-shaped cover is fixedly connected to one end of the lifting airbag at the top, and a lower arc-shaped cover is fixedly connected to one end of the lifting airbag at the bottom. Observation mirrors are arranged on both sides of the upper arc-shaped cover and the lower arc-shaped cover. First sealing strips are arranged on the edges of the upper arc-shaped cover and the lower arc-shaped cover.

[0009] Preferably, a storage groove is arranged inside the storage base. A telescopic airbag is arranged inside the storage groove. An inflation valve seat is arranged at one end of the telescopic airbag, and a pulling seat is arranged at the other end of the telescopic airbag.

[0010] Preferably, a fan frame is fixedly connected to one end of the air suction frame. A fan body is arranged inside the fan frame. An air suction ring grille is arranged on the edge of the fan body.

[0011] Preferably, the other end of the air suction frame is movably connected to a movable extraction seat, and a filter element is arranged at one end of the movable extraction seat.

[0012] Preferably, limiting side frames are fixedly connected to both sides of the first detection frame and the second detection frame. Limiting sliding grooves are formed in the inner walls of the limiting side frames. Detection sliding seats are movably connected to both ends of the first detection frame and the second detection frame. Mounting screw holes are formed at one end of the detection sliding seats, and connecting seats are arranged at the other ends of the detection sliding seats.

[0013] Preferably, a rotating groove is formed in the center of the inside of the flipping frame, and second sealing strips are arranged on both sides of the flipping frame.

[0014] Preferably, positioning seats are fixedly connected to both ends of the rotating roller, and positioning side grooves are formed on both sides of the positioning seats.

[0015] Preferably, a positioning hole is formed in the inside of the positioning frame, and electric push rods are arranged on both sides of the positioning frame. Positioning top blocks are movably connected to both sides of the inner wall of the positioning hole through the electric push rods.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The plastic tensile testing device based on intelligent sensors enables the device to perform continuous and efficient loading and unloading operations for plastic tensile testing based on intelligent sensors. During actual use, it adaptively performs tensile testing operations on the detection slide inside the first detection rack towards both ends, so that more accurate tensile test data can be obtained at the sensor body in the center of the electric slide rail. At the same time, when the plastic raw materials inside the first detection rack complete the tensile test, the flipping motor inside the motor rack can be adaptively started, and it rotates through the rotating roller at one end at the rotating groove in the center of the device rack to perform the replacement and adjustment operation of the fractured plastic raw materials, enabling the device to achieve efficient plastic tensile testing based on the sensor body, reflecting the practicality of the device design.

[0017] The plastic tensile testing device based on intelligent sensors further improves the overall usage effect of the device. During daily use, the upper and lower lifting air bags drive the upper arc cover or the lower arc cover at their respective ends to perform adaptive telescopic adjustment operations, covering and protecting the upper and lower positions of the first detection rack and the second detection rack to prevent the internal plastic tensile testing from being affected by the outside world. At the same time, the fan body inside the blower rack at one end of the suction rack can be adaptively started, and then, in cooperation with the filter element at one end of the movable extraction seat, the plastic waste chips are inhaled and collected to ensure a safer and more reliable enclosed plastic tensile testing operation for the device, reflecting the comprehensiveness of the device design. Description of the Drawings

[0018] Figure 1 is a three-dimensional schematic diagram of the structure of the present invention; Figure 2 is an overall schematic diagram of the flipping rack structure of the present invention; Figure 3 is an overall schematic diagram of the flipping motor structure of the present invention; Figure 4 is an overall schematic diagram of the positioning rack structure of the present invention; Figure 5 is an overall schematic diagram of the storage seat structure of the present invention; Figure 6 is an overall schematic diagram of the control air pipe rack structure of the present invention; Figure 7 is an overall schematic diagram of the upper arc cover structure of the present invention; Figure 8 is a partial view schematic diagram of the suction rack structure of the present invention; Figure 9 of the present invention Figure 1 is an enlarged schematic diagram of the structure at A in; Figure 10 of the present invention Figure 2 is an enlarged schematic diagram of the structure at B in.

[0019] In the figure: 1. Equipment rack; 2. Positioning rack; 3. Motor rack; 4. Tipping motor; 5. Rotating roller; 6. Tipping rack; 7. Control panel; 8. First detection rack; 9. Second detection rack; 10. Electric slide rail; 11. Sensor body; 12. Air suction rack; 13. Docking seat; 14. Storage seat; 15. Air control pump; 16. Upper ventilation rack; 17. Air control pipe rack; 18. Lifting airbag; 19. Lower ventilation rack; 20. Support base; 21. Upper arc cover; 22. Lower arc cover; 23. Observation mirror; 24. First sealing strip; 25. Storage groove; 26. Telescopic airbag; 27. Inflation valve seat; 28. Pulling seat; 29. Fan rack; 30. Fan body; 31. Air suction ring grille; 32. Movable extraction seat; 33. Filter element; 34. Limit side rack; 35. Limit sliding groove; 36. Detection sliding seat; 37. Mounting screw hole; 38. Connecting seat; 39. Rotating groove; 40. Second sealing strip; 41. Positioning seat; 42. Positioning side groove; 43. Positioning hole; 44. Electric push rod; 45. Positioning top block. Detailed implementation manner

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figures 1 - 10 , an embodiment provided by the present invention: A plastic tensile testing device based on an intelligent sensor, comprising a device frame 1. Both ends of the device frame 1 are fixedly connected with positioning frames 2. One end of the positioning frame 2 is fixedly connected with a motor frame 3. Inside the motor frame 3, there is a flipping motor 4. One end of the flipping motor 4 is fixedly connected with a rotating roller 5. Inside the device frame 1, there is a flipping frame 6. On the side of the flipping frame 6, there is a control panel 7. At the top of the flipping frame 6, there is a first detection frame 8 fixedly connected. At the bottom of the flipping frame 6, there is a second detection frame 9 fixedly connected. Between the first detection frame 8 and the second detection frame 9, there is an electric slide rail 10. Inside the center of the electric slide rail 10, there is a sensor body 11 arranged vertically. The other end of the positioning frame 2 is fixedly connected with a suction frame 12. One end of the suction frame 12 is fixedly connected with a fan frame 29. Inside the fan frame 29, there is a fan body 30. At the edge of the fan body 30, there is a suction ring grille 31. The other end of the suction frame 12 is movably connected with a movable extraction seat 32. At one end of the movable extraction seat 32, there is a filter element 33. On both sides of the first detection frame 8 and the second detection frame 9, there are limit side frames 34 fixedly connected. Inside the inner wall of the limit side frame 34, there are limit chutes 35 opened. At both ends of the first detection frame 8 and the second detection frame 9, there are detection slide seats 36 movably connected. At one end of the detection slide seat 36, there is an installation screw hole 37 opened. At the other end of the detection slide seat 36, there is a connecting seat 38. Inside the center of the flipping frame 6, there is a rotating groove 39 opened. On both sides of the flipping frame 6, there are second sealing strips 40. At both ends of the rotating roller 5, there are positioning seats 41 fixedly connected. On both sides of the positioning seat 41, there are positioning side grooves 42 opened. Inside the positioning frame 2, there is a positioning hole 43 opened. On both sides of the positioning frame 2, there are electric push rods 44. On both sides of the inner wall of the positioning hole 43, there are positioning top blocks 45 movably connected through the electric push rods 44. Start the flipping motor 4 inside the motor frame 3, and make it rotate through the rotating roller 5 at one end at the rotating groove 39 in the center of the device frame 1, quickly realizing the flipping operation of the whole flipping frame 6. During the flipping process, the electric push rods 44 at both ends of the positioning frame 2 can be adaptively started, so that through the positioning top blocks 45 at the positioning hole 43, the flipping positioning operation is carried out at the positioning side grooves 42 of the positioning seats 41 at both ends of the rotating roller 5, which also makes the first detection frame 8 and the second detection frame 9 perform the up-and-down transposition operation.

[0022] Docking base 13, docking bases 13 are fixedly connected to the upper and lower ends of the equipment rack 1. One end of the docking base 13 is fixedly connected to a storage base 14. One end of the storage base 14 is fixedly connected to an air control pump 15. The side of the top storage base 14 is fixedly connected to an upper ventilation frame 16. One end of the upper ventilation frame 16 is fixedly connected to an air control pipe frame 17. An air lifting bladder 18 is arranged on the inner wall of the air control pipe frame 17. The side of the bottom storage base 14 is fixedly connected to a lower ventilation frame 19. The bottom end of the lower ventilation frame 19 is fixedly connected to a support base 20. The upper ventilation frame 16 and the lower ventilation frame 19 are adapted to each other. One end of the top air lifting bladder 18 is fixedly connected to an upper arc cover 21. One end of the bottom air lifting bladder 18 is fixedly connected to a lower arc cover 22. Observation mirrors 23 are arranged on both sides of the upper arc cover 21 and the lower arc cover 22. First sealing strips 24 are arranged on the edges of the upper arc cover 21 and the lower arc cover 22. A storage groove 25 is arranged inside the storage base 14. A telescopic air bladder 26 is arranged inside the storage groove 25. An inflation valve seat 27 is arranged at one end of the telescopic air bladder 26. A pulling seat 28 is arranged at the other end of the telescopic air bladder 26. Start the air control pump 15 at one end of the storage base 14, and cooperate with the upper ventilation frame 16 on the side of the storage base 14 to perform the adaptation inflation and deflation operations at the upper and lower air control pipe frames 17, so that the upper and lower air lifting bladders 18 drive the upper arc cover 21 or the lower arc cover 22 at their respective ends to perform the adaptation telescopic adjustment operation, and perform the covering and protection operation on the upper and lower positions of the first detection frame 8 and the second detection frame 9, avoiding the influence of the external environment on the internal plastic tensile test. The observation mirrors 23 on both sides of the upper arc cover 21 and the lower arc cover 22 perform daily internal observation operations.

[0023] Working principle: When in use, the user first installs the two end clamps for fixed installation of plastic tensile testing to be used at the detection slide seats 36 inside both ends of the first detection frame 8, and then places the plastic raw material for tensile testing on the clamps. At this time, by controlling the electric slide rail 10 on the inner bottom wall of the first detection frame 8, the movement adjustment of the two end detection slide seats 36 carrying the clamps can be realized, and the stable fixing operation of the plastic material between the two end clamps can be achieved. After that, the storage seats 14 and the air control pump machines 15 located at both ends can be started as appropriate. The air control pump machine 15 performs the air charging and discharging operation inside the storage seat 14, controls the telescopic operation of the telescopic airbag 26 inside the storage groove 25, and the pulling seat 28 at its other end can be abutted against the connecting seat 38 of the detection slide seat 36, and the tensile testing operation of the detection slide seat 36 inside the first detection frame 8 towards both ends can be performed as appropriate. And the limiting side frames 34 on both sides of the first detection frame 8 cooperate with the limiting sliding grooves 35 on the inner wall to perform the limiting sliding of the detection slide seat 36, ensuring the tensile stability of the plastic raw material, so that more accurate tensile test data can be obtained at the sensor body 11 at the center inside the electric slide rail 10. At the same time, in daily use, when the plastic raw material inside the first detection frame 8 has completed the tensile test, the flipping motor 4 inside the motor frame 3 can be started as appropriate, and it rotates through the rotating roller 5 at one end at the rotating groove 39 at the center inside the equipment frame 1, quickly realizing the overall tumbling operation of the flipping frame 6. During the tumbling process, the electric push rods 44 at both ends of the positioning frame 2 can be started as appropriate, and they perform the flipping positioning operation at the positioning side grooves 42 of the positioning seats 41 at both ends of the rotating roller 5 through the positioning top blocks 45 at the positioning holes 43, which also makes the first detection frame 8 and the second detection frame 9 perform the up-and-down transposition operation. Then, the plastic material inside the second detection frame 9 is subjected to the tensile test, and the first detection frame 8 is located at the bottom of the equipment frame 1 to perform the replacement and adjustment operation of the tested and broken plastic raw material, so that the equipment realizes efficient plastic tensile testing based on the sensor body 11. During the daily use process, when the first detection frame 8 and the second detection frame 9 at the upper and lower ends of the flipping frame 6 are flipped up and down for use, the staff can start the air control pump machine 15 at one end of the storage seat 14 as appropriate, cooperate with the upper ventilation frame 16 on the side of the storage seat 14, and perform the appropriate air charging and discharging operation at the upper and lower air control pipe frames 17, which also makes the upper and lower lifting airbags 18 drive the upper arc cover 21 or the lower arc cover 22 at their respective ends to perform the appropriate telescopic adjustment operation, and perform the covering and protection operation of the upper and lower positions of the first detection frame 8 and the second detection frame 9, avoiding the influence of the internal plastic tensile test by the outside world. The observation mirrors 23 on both sides of the upper arc cover 21 and the lower arc cover 22 perform the daily internal observation operation, and the first sealing strips 24 at their edges can be docked at the second sealing strips 40 at the side edges of the equipment frame 1 as appropriate to perform the edge sealing operation. At the same time, when the plastic tensile test is carried out inside the first detection frame 8 or the second detection frame 9, the fan body 30 inside the fan frame 29 at one end of the air suction frame 12 can be started as appropriate,It performs an air suction operation at the air suction ring grille 31, and then cooperates with the filter element 33 at one end of the movable extraction seat 32 to perform the inhalation and collection operation of plastic waste chips, ensuring a more safe and reliable closed plastic stretching test operation for the equipment. The above is the entire working principle of the present invention.

[0024] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A plastic tensile testing device based on an intelligent sensor, comprising a device frame (1), characterized in that: The two ends of the equipment frame (1) are fixedly connected to positioning frames (2), one end of the positioning frame (2) is fixedly connected to a motor frame (3), a flip motor (4) is arranged inside the motor frame (3), one end of the flip motor (4) is fixedly connected to a rotating roller (5), a flip frame (6) is arranged inside the equipment frame (1), a control panel (7) is arranged on the side of the flip frame (6), a first detection frame (8) is fixedly connected to the top of the flip frame (6), a second detection frame (9) is fixedly connected to the bottom of the flip frame (6), an electric slide rail (10) is arranged between the first detection frame (8) and the second detection frame (9), a sensor body (11) is arranged above and below the inner center of the electric slide rail (10), and the other end of the positioning frame (2) is fixedly connected to a suction frame (12); A docking seat (13), the upper and lower ends of the equipment frame (1) are fixedly connected to the docking seat (13), one end of the docking seat (13) is fixedly connected to a storage seat (14), one end of the storage seat (14) is fixedly connected to an air control pump (15), the top of the storage seat (14) is fixedly connected to an upper ventilation frame (16) on the side, one end of the upper ventilation frame (16) is fixedly connected to an air control pipe frame (17), and the inner wall of the air control pipe frame (17) is provided with a lifting air bag (18).

2. A plastic tensile testing device based on an intelligent sensor according to claim 1, characterized in that: A lower ventilation frame (19) is fixedly connected to the side of the storage seat (14) at the bottom, and a support base (20) is fixedly connected to the bottom end of the lower ventilation frame (19), and the upper ventilation frame (16) and the lower ventilation frame (19) are adapted to each other.

3. The plastic tensile testing device based on an intelligent sensor according to claim 1, characterized in that: One end of the lifting airbag (18) at the top is fixedly connected to an upper arc-shaped cover (21), and one end of the lifting airbag (18) at the bottom is fixedly connected to a lower arc-shaped cover (22). Observation mirrors (23) are provided on both sides of the upper arc-shaped cover (21) and the lower arc-shaped cover (22), and first sealing strips (24) are provided on the edges of the upper arc-shaped cover (21) and the lower arc-shaped cover (22).

4. The plastic tensile testing device based on an intelligent sensor according to claim 1, characterized in that: A storage groove (25) is provided inside the storage seat (14), a telescopic airbag (26) is provided inside the storage groove (25), an inflation valve seat (27) is provided at one end of the telescopic airbag (26), and a pulling seat (28) is provided at the other end of the telescopic airbag (26).

5. The plastic tensile testing device based on intelligent sensor according to claim 1, characterized in that: One end of the air suction frame (12) is fixedly connected to a fan frame (29), a fan body (30) is arranged inside the fan frame (29), and an air suction ring grille (31) is arranged on the edge of the fan body (30).

6. The plastic tensile testing device based on an intelligent sensor according to claim 1, characterized in that: The other end of the air suction frame (12) is movably connected to a movable extraction seat (32), and a filter element (33) is provided at one end of the movable extraction seat (32).

7. The plastic tensile testing device based on intelligent sensor according to claim 1, characterized in that: The first detection frame (8) and the second detection frame (9) are fixedly connected to the limiting side frames (34) on both sides, and the inner wall of the limiting side frames (34) is provided with a limiting sliding groove (35). The first detection frame (8) and the second detection frame (9) are movably connected to the two ends of the detection slide seat (36), one end of the detection slide seat (36) is provided with a mounting screw hole (37), and the other end of the detection slide seat (36) is provided with a connecting seat (38).

8. The plastic tensile testing device based on intelligent sensor according to claim 1, characterized in that: A rotation groove (39) is provided at the inner center of the turning frame (6), and second sealing strips (40) are provided on both sides of the turning frame (6).

9. The plastic tensile testing device based on intelligent sensor according to claim 1, characterized in that: The two ends of the rotating roller (5) are fixedly connected to positioning seats (41), and positioning side grooves (42) are formed on both sides of the positioning seat (41).

10. The plastic tensile testing device based on intelligent sensor according to claim 1, characterized in that: A positioning hole (43) is provided inside the positioning frame (2), electric push rods (44) are provided on both sides of the positioning frame (2), and positioning top blocks (45) are movably connected to both sides of the inner wall of the positioning hole (43) via the electric push rods (44).

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