Blood sampling device

Abstract

The application relates to the technical field of auxiliary instruments, in particular to a blood sampling device facilitating blood sampling. The application comprises an operation table and a side fixing box, one end of the top of the operation table is fixed with the side fixing box, an auxiliary positioning mechanism is assembled between the operation table and the side fixing box, the auxiliary positioning mechanism comprises a power assembly and a guide assembly, the inside of the side fixing box is assembled with the power assembly, the power assembly is used for providing a power source for the auxiliary positioning mechanism, the inside of the power assembly is assembled with the guide assembly, and the guide assembly is used for providing power guidance for the auxiliary positioning mechanism. Through the structural design of the auxiliary positioning mechanism and the adjusting mechanism, the device can conveniently position the arm of a patient, prevent the patient from keeping an arm in a state for a long time to cause arm numbness, can be used as a hemostasis device in the later period, and the flexibility of the device is improved.

Description

Technical Field

[0001] This invention relates to the field of assistive device technology, and more particularly to a blood collection device that facilitates blood collection. Background Technology

[0002] In the medical field, healthcare professionals collect clinical physiological and pathological parameters of the human body through various testing methods. This process is crucial because these parameters provide detailed information about the patient's health condition, aiding in disease diagnosis. First, healthcare professionals collect the patient's medical history, including symptoms, past medical history, and family medical history. This information helps doctors make an initial assessment of potential problems. Second, as needed, healthcare professionals collect samples such as blood, urine, stool, and tissues using various testing methods. These samples are sent to laboratories for testing to obtain more accurate and objective physiological and pathological parameters.

[0003] Through laboratory testing, medical professionals can obtain information such as the levels of metabolites, enzymes, hormones, and other substances in a patient's body, as well as information on cell morphology and tissue structure. This information reflects the patient's physiological state and pathological changes, and is of great significance for disease diagnosis and treatment. Besides laboratory testing, the medical field has many other testing methods, such as imaging examinations, endoscopy, and electrocardiograms. These methods help medical professionals gain a more comprehensive understanding of the patient's condition, identify potential problems, and evaluate treatment effectiveness.

[0004] The proficiency of blood collection techniques directly affects the quality of blood and the health of blood donors. To facilitate blood collection, blood collection devices, such as arm supports, are often used during the process. However, existing blood collection devices lack arm positioning. Because the arm has to maintain one position, it is easy to cause arm tension and numbness, resulting in discomfort in the arm after blood collection. Therefore, we propose a blood collection device that facilitates blood collection. Summary of the Invention

[0005] The purpose of this invention is to provide a convenient blood collection device to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A convenient blood collection device includes an operating table and a side fixing box. The side fixing box is fixed to one end of the top of the operating table. An auxiliary positioning mechanism is assembled between the operating table and the side fixing box. The auxiliary positioning mechanism includes a power component and a guide component. The power component is assembled inside the side fixing box. The power component is used to provide a power source for the auxiliary positioning mechanism. The guide component is assembled inside the power component. The guide component is used to provide power guidance for the auxiliary positioning mechanism.

[0008] Preferably, the power assembly includes a servo motor, a transverse worm gear, a worm wheel, a support shaft, a guide gear, a mounting guide rod, and a pin. A servo motor is fixed to one side of the interior of the side mounting box. The output end of the servo motor is fixed to the transverse worm gear. The outer side of the transverse worm gear is meshed with a worm wheel. Two support shafts are rotatably connected to both ends of one side of the interior of the side mounting box via bearings. One of the support shafts is fixed to the inner side of the worm wheel. A guide gear is fixed to one end of each support shaft. The two guide gears are meshed together. A pin is mounted on one side of each guide gear, and a mounting guide rod is rotatably connected to the outer side of each pin.

[0009] Preferably, the guide assembly includes a mounting rod, an auxiliary connecting rod, a vertical moving rod, a mounting column, a force-applying roller, and a mating moving seat. The tops of the two mounting guide rods are rotatably connected to a mounting rod via pins. An auxiliary connecting rod is fixed to one side of the mounting rod. A vertical groove corresponding to the position of the auxiliary connecting rod is opened on one side of the side fixing box. The vertical groove is slidably connected to the auxiliary connecting rod. A vertical moving rod is fixed to the bottom of the auxiliary connecting rod. A mounting column is fixed to the bottom of the vertical moving rod. A force-applying roller is rotatably connected to one end of the mounting column via a pin. A mating moving seat is fitted to the bottom of the force-applying roller. The mating moving seat is slidably connected to the operating table.

[0010] Preferably, one side of the mating movable seat is provided with an acute-angled bevel, which is in close contact with the force-applying roller. An arc-shaped support is fixed on the other side of the mating movable seat. An L-shaped bearing rod is fixed on the top of the operating table at a position corresponding to the mating movable seat, and an arc-shaped support is also fixed at one end of the L-shaped bearing rod.

[0011] Preferably, the inner side of each arc-shaped support is bonded with a medical protective pad.

[0012] Preferably, both sides of the movable seat are fixed with a fixed cylinder, and one end of the inner side of the fixed cylinder is fixed with a return spring. The return spring is in clearance fit with the inner side of the fixed cylinder, and one end of the return spring is fixed with a sliding rod. The sliding rod is slidably connected to the inner side of the fixed cylinder, and one end of the sliding rod is fixed to the side fixed box.

[0013] Preferably, an adjustment mechanism is assembled between the guide gear and the pin shaft, the adjustment mechanism being used to adjust the position of the guide rod.

[0014] Preferably, the adjusting mechanism includes a force guide wheel, an auxiliary strip groove, a threaded rod, a force-applying rotating rod, and a displacement T-block. A force guide wheel is fixed to one side of each force guide wheel, and an auxiliary strip groove is formed on one side of each force guide wheel. A threaded rod is rotatably connected to both ends of the inner side of each auxiliary strip groove, and a displacement T-block is threadedly connected to the outer side of each threaded rod. The displacement T-block is slidably connected to the auxiliary strip groove and fixed to a pin. A force-applying rotating rod is rotatably connected to one side of each force guide wheel, and one end of the force-applying rotating rod is fixed to the threaded rod.

[0015] Preferably, a torque sensor is fixed to the outer side of one of the support shafts, and a microcontroller is fixed to one side of the side mounting box. The microcontroller is electrically connected to the torque sensor and the servo motor via wires.

[0016] Preferably, the top of the operating table is provided with a limiting displacement groove corresponding to the position of the mating movable seat. The limiting displacement groove is slidably connected to the mating movable seat. Anti-detachment moving protrusions are fixed on both sides of the mating movable seat. Side movable grooves corresponding to the positions of the anti-detachment moving protrusions are provided on both sides inside the limiting displacement groove. The anti-detachment moving protrusions are slidably connected to the side movable grooves.

[0017] It is clear without a doubt that the technical solution described above in this application can solve the technical problem that this application aims to address.

[0018] Meanwhile, through the above technical solutions, the present invention has at least the following beneficial effects:

[0019] The present invention, through the structural design of the auxiliary positioning mechanism and the adjustment mechanism, makes it easy to position the patient's arm, preventing the patient's arm from being numb due to prolonged exertion in one position. At the same time, it can also be used as a hemostatic device in the later stage, which improves the flexibility of the device. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2This is a schematic diagram of the connection structure between the operating table and the side fixing box of the present invention;

[0023] Figure 3 This is a cross-sectional structural diagram of the side fixing box of the present invention;

[0024] Figure 4 This is a schematic diagram of the connection structure between the support shaft and the guiding gear of the present invention;

[0025] Figure 5 This is a schematic diagram of the connection structure between the mounting column and the force-applying roller of the present invention;

[0026] Figure 6 This is a cross-sectional structural diagram of the force-guiding wheel of the present invention;

[0027] Figure 7 This is a cross-sectional structural diagram of the operating table of the present invention.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] In the diagram: 1. Operating console; 2. Side mounting box; 3. Servo motor; 4. Horizontal worm gear; 5. Worm wheel; 6. Support shaft; 7. Guide gear; 8. Mounting guide rod; 9. Pin shaft; 10. Mounting top rod; 11. Auxiliary connecting rod; 12. Vertical moving rod; 13. Mounting column; 14. Force-applying roller; 15. Matching moving seat; 16. Acute-angled bevel; 17. Arc-shaped support; 18. L-shaped bearing rod; 19. Medical protective pad; 20. Guide wheel; 21. Auxiliary strip groove; 22. Threaded rod; 23. Force-applying rotating rod; 24. Displacement T-block; 25. Limiting displacement groove; 26. Anti-detachment moving protrusion; 27. Side movable groove; 28. Torque sensor; 29. ​​Microcontroller; 30. Fixing cylinder; 31. Return spring; 32. Matching sliding rod. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] Example 1

[0032] Reference Figure 1-7 A convenient blood collection device includes an operating table 1 and a side fixing box 2. The side fixing box 2 is fixed to one end of the top of the operating table 1. An auxiliary positioning mechanism is installed between the operating table 1 and the side fixing box 2. The auxiliary positioning mechanism includes a power component and a guide component. The power component is installed inside the side fixing box 2. The power component is used to provide a power source for the auxiliary positioning mechanism. The guide component is installed inside the power component. The guide component is used to provide power guidance for the auxiliary positioning mechanism.

[0033] The power assembly includes a servo motor 3, a transverse worm gear 4, a worm wheel 5, a support shaft 6, a guide gear 7, a guide rod 8, and a pin 9. The servo motor 3 is fixed to one side of the side mounting box 2. The output end of the servo motor 3 is fixed to the transverse worm gear 4, and the outer side of the transverse worm gear 4 is meshed with the worm wheel 5. Both ends of one side of the side mounting box 2 are rotatably connected to two support shafts 6 via bearings. One support shaft 6 is fixed to the inner side of the worm wheel 5. A guide gear 7 is fixed to one end of each support shaft 6, and the two guide gears 7 are meshed together. A pin 9 is mounted on one side of each guide gear 7, and a guide rod 8 is rotatably connected to the outer side of each pin 9. When the servo motor 3 is started, the output end of the servo motor 3 drives the transverse worm gear 4 to mesh with the worm wheel 5, thereby causing the support shaft 6 to drive the guide gear 7 to rotate, achieving rotation of the two guide gears 7 in opposite directions.

[0034] The guiding assembly includes a mounting rod 10, an auxiliary connecting rod 11, a vertical moving rod 12, a mounting post 13, a force-applying roller 14, and a mating moving seat 15. The tops of two mounting guide rods 8 are rotatably connected to a mounting rod 10 via pins. An auxiliary connecting rod 11 is fixed to one side of the mounting rod 10. A vertical groove corresponding to the position of the auxiliary connecting rod 11 is opened on one side of the side fixing box 2. The vertical groove is slidably connected to the auxiliary connecting rod 11. A vertical moving rod 12 is fixed to the bottom of the auxiliary connecting rod 11. A mounting post 13 is fixed to the bottom of the vertical moving rod 12. One end of the mounting post 13 is rotatably connected to a force-applying roller 14 via a pin. The bottom of the wheel 14 is equipped with a mating movable seat 15, which is slidably connected to the operating table 1. The mounting guide rod 8 is rotatably connected to the mounting top rod 10, the mounting top rod 10 is fixed to the auxiliary connecting rod 11, and the auxiliary connecting rod 11 is slidably connected to the vertical groove. The auxiliary connecting rod 11 is fixed to the vertical moving rod 12. When the mounting top rod 10 moves downward, the auxiliary connecting rod 11 can drive the vertical moving rod 12 to move downward, so that the vertical moving rod 12 pushes the mounting column 13, causing the force-applying roller 14 to roll along the outside of the acute-angled inclined plane 16, thereby causing the mating movable seat 15 to move along the inside of the limiting displacement groove 25.

[0035] An acute-angled bevel 16 is provided on one side of the movable base 15, which is in close contact with the force-applying roller 14. An arc-shaped support 17 is fixed on the other side of the movable base 15. An L-shaped support rod 18 is fixed on the top of the operating table 1 at a position corresponding to the movable base 15. An arc-shaped support 17 is also fixed at one end of the L-shaped support rod 18. The acute-angled bevel 16 facilitates the movement of the movable base 15 when the force-applying roller 14 moves downward.

[0036] Medical protective pads 19 are glued to the inner side of the arc-shaped support 17. The medical protective pads 19 can protect the patient's arm. At the same time, hemostatic pads can also be glued to the inner side of the arc-shaped support 17 during later use, so that the device can be used as a hemostatic device for patients to perform pressure hemostasis.

[0037] Both sides of the movable seat 15 are fixed with a fixed cylinder 30. One end of the inner side of the fixed cylinder 30 is fixed with a return spring 31. The return spring 31 is in clearance fit with the inner side of the fixed cylinder 30. One end of the return spring 31 is fixed with a sliding rod 32. The sliding rod 32 is slidably connected to the inner side of the fixed cylinder 30. One end of the sliding rod 32 is fixed to the side fixed box 2. When the movable seat 15 moves along the inner side of the limiting displacement groove 25, the return spring 31 is stretched or compressed by the sliding rod 32, so that the movable seat 15 can be moved and reset when it is not pushed by the force roller 14.

[0038] A torque sensor 28 is fixed to the outside of one of the support shafts 6, and a microcontroller 29 is fixed to one side of the side mounting box 2. The microcontroller 29 is electrically connected to the torque sensor 28 and the servo motor 3 through wires. The setup of the torque sensor 28 and the microcontroller 29 facilitates the control of the output torque of the servo motor 3.

[0039] The top of the operating table 1 is provided with a limiting displacement groove 25 corresponding to the position of the mating movable seat 15. The limiting displacement groove 25 is slidably connected to the mating movable seat 15. Both sides of the mating movable seat 15 are fixed with anti-detachment moving protrusions 26. Both sides of the inside of the limiting displacement groove 25 are provided with side movable grooves 27 corresponding to the position of the anti-detachment moving protrusions 26. The anti-detachment moving protrusions 26 are slidably connected to the side movable grooves 27. When the mating movable seat 15 moves along the inner side of the limiting displacement groove 25, the anti-detachment moving protrusions 26 can move along the inner side of the side movable grooves 27, providing guidance and limiting function for the mating movable seat 15.

[0040] Example 2

[0041] Further optimizations to Example 1, specifically, such as... Figure 6 As shown, an adjustment mechanism is assembled between the guide gear 7 and the pin shaft 9. The adjustment mechanism is used to adjust the position of the guide rod 8.

[0042] The adjustment mechanism includes a force guide wheel 20, an auxiliary strip groove 21, a threaded rod 22, a force-applying rotating rod 23, and a displacement T-block 24. A force guide wheel 20 is fixed to one side of each force guide gear 7. An auxiliary strip groove 21 is provided on one side of each force guide wheel 20. A threaded rod 22 is rotatably connected to both ends of the inner side of the auxiliary strip groove 21. A displacement T-block 24 is threadedly connected to the outer side of each threaded rod 22. The displacement T-block 24 is slidably connected to the auxiliary strip groove 21 and fixed to the pin shaft 9. A force-applying rotating rod 23 is rotatably connected to one side of each force guide wheel 20. One end of the force-applying rotating rod 23 is fixed to the threaded rod 22. When the position of the force guide rod 8 needs to be adjusted, the force-applying rotating rod 23 is rotated, causing the threaded rod 22 to rotate. This causes the displacement T-block 24 to drive the pin shaft 9 to move along the inner side of the auxiliary strip groove 21, thereby adjusting the movement range of the force guide rod 8.

[0043] In summary:

[0044] This invention addresses the technical problem that existing blood collection devices lack arm positioning, causing the arm to remain in one position, which can lead to tension and numbness, resulting in discomfort after blood collection. The invention employs the technical solutions described in the above embodiments. Furthermore, the implementation process of the above technical solutions is as follows:

[0045] All electrical components in this device are existing technologies, and their models are only one of them. Any electrical component that can achieve the purpose of this device can be used. Connect all electrical components in the device to their compatible power supply through wires. In addition, a suitable controller should be selected according to the actual situation to meet the control requirements. The specific connection and control sequence should refer to the working principle below, and the electrical connection between each electrical component should be completed in the order of operation. The detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and will not explain the electrical control.

[0046] During use, in the blood collection process, the patient places their arm between two L-shaped support rods 18. Then, the torque threshold of the torque sensor 28 is set via the microcontroller 29. Next, the servo motor 3 is activated. The output of the servo motor 3 drives the transverse worm gear 4 to mesh with the worm wheel 5, causing the worm wheel 5 to drive the support shaft 6 to rotate. This, in turn, causes the support shaft 6 to drive the guide gear 7 to rotate, resulting in the two guide gears 7 rotating in opposite directions. Because the guide rod 8 is rotatably connected to the pin shaft 9, and the guide rod 8 is rotatably connected to the top rod 10, and the top rod 10 is fixed to the auxiliary connecting rod 11, which is slidably connected to the vertical groove. Next, the auxiliary connecting rod 11 is fixed to the vertical moving rod 12, so that the auxiliary connecting rod 11 can drive the vertical moving rod 12 to move downward, so that the vertical moving rod 12 pushes the mounting column 13, so that the force-applying roller 14 rolls along the outside of the acute-angled inclined plane 16, and then the cooperating moving seat 15 moves along the inside of the limiting displacement groove 25, so that the cooperating moving seat 15 drives one of the arc-shaped supports 17 to move towards the L-shaped bearing rod 18 until the L-shaped bearing rod 18 contacts the patient's arm, thereby positioning the patient's arm. At this time, the patient's arm will not shake randomly, which makes it easier for medical staff to use blood collection injection to perform blood collection operations.

[0047] When the torque sensor 28 receives a torque that reaches the set threshold, the torque sensor 28 transmits the signal to the microcontroller 29. The microcontroller 29 processes the signal and sends a shutdown command to the servo motor 3, thereby preventing the L-shaped support rod 18 from making excessive contact with the patient's arm while positioning the patient's arm.

[0048] With the above-mentioned settings, this application will certainly solve the above-mentioned technical problems, and at the same time achieve the following technical effects:

[0049] The present invention, through the structural design of the auxiliary positioning mechanism and the adjustment mechanism, makes it easy to position the patient's arm, preventing the patient's arm from being numb due to prolonged exertion in one position. At the same time, it can also be used as a hemostatic device in the later stage, which improves the flexibility of the device.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A convenient blood collection device, characterized in that, The device includes an operating table (1) and a side fixing box (2). The side fixing box (2) is fixed to one end of the top of the operating table (1). An auxiliary positioning mechanism is assembled between the operating table (1) and the side fixing box (2). The auxiliary positioning mechanism includes a power component and a guide component. The power component is assembled inside the side fixing box (2). The power component is used to provide a power source for the auxiliary positioning mechanism. The guide component is assembled inside the power component. The guide component is used to provide power guidance for the auxiliary positioning mechanism. The power assembly includes a servo motor (3), a transverse worm (4), a worm wheel (5), a support shaft (6), a guide gear (7), a guide rod (8), and a pin (9). The servo motor (3) is fixed on one side inside the side fixing box (2). The output end of the servo motor (3) is fixed with the transverse worm (4). The outer side of the transverse worm (4) is meshed with the worm wheel (5). Both ends of one side of the side fixing box (2) are rotatably connected to two support shafts (6) through bearings. One of the support shafts (6) is fixed to the inner side of the worm wheel (5). One end of the support shaft (6) is fixed with a guide gear (7). The two guide gears (7) are meshed with each other. One side of the guide gear (7) is equipped with a pin (9). The outer side of the pin (9) is rotatably connected with a guide rod (8). The guide assembly includes a mounting rod (10), an auxiliary connecting rod (11), a vertical moving rod (12), a mounting column (13), a force-applying roller (14), and a mating moving seat (15). The tops of the two mounting guide rods (8) are rotatably connected to a mounting rod (10) by pins. An auxiliary connecting rod (11) is fixed on one side of the mounting rod (10). A vertical groove corresponding to the position of the auxiliary connecting rod (11) is opened on one side of the side fixing box (2). The vertical groove is slidably connected to the auxiliary connecting rod (11). A vertical moving rod (12) is fixed at the bottom of the auxiliary connecting rod (11). A mounting column (13) is fixed at the bottom of the vertical moving rod (12). A force-applying roller (14) is rotatably connected to one end of the mounting column (13) by pins. A mating moving seat (15) is fitted at the bottom of the force-applying roller (14). The mating moving seat (15) is slidably connected to the operating table (1). One side of the mating movable seat (15) is provided with an acute angled slope (16), which is in close contact with the force-applying roller (14). The other side of the mating movable seat (15) is fixed with an arc-shaped support (17). The top of the operating table (1) and the position corresponding to the mating movable seat (15) are fixed with an L-shaped bearing rod (18), and one end of the L-shaped bearing rod (18) is also fixed with an arc-shaped support (17).

2. The convenient blood collection device according to claim 1, characterized in that, The inner side of each of the arc-shaped supports (17) is bonded with a medical protective pad (19).

3. The convenient blood collection device according to claim 1, characterized in that, Both sides of the movable seat (15) are fixed with a fixed cylinder (30). One end of the inner side of the fixed cylinder (30) is fixed with a return spring (31). The return spring (31) is in clearance fit with the inner side of the fixed cylinder (30). One end of the return spring (31) is fixed with a sliding rod (32). The sliding rod (32) is slidably connected to the inner side of the fixed cylinder (30). One end of the sliding rod (32) is fixed to the side fixed box (2).

4. The convenient blood collection device according to claim 1, characterized in that, An adjustment mechanism is assembled between the guide gear (7) and the pin (9), and the adjustment mechanism is used to adjust the position of the guide rod (8).

5. The convenient blood collection device according to claim 4, characterized in that, The adjustment mechanism includes a force guide wheel (20), an auxiliary strip groove (21), a threaded rod (22), a force application rod (23), and a displacement T-block (24). The force guide gear (7) is fixed with a force guide wheel (20) on one side. The force guide wheel (20) is provided with an auxiliary strip groove (21) on one side. A threaded rod (22) is rotatably connected to both ends of the inner side of the auxiliary strip groove (21). A displacement T-block (24) is threadedly connected to the outer side of the threaded rod (22). The displacement T-block (24) is slidably connected to the auxiliary strip groove (21). The displacement T-block (24) is fixed to the pin shaft (9). A force application rod (23) is rotatably connected to one side of the force guide wheel (20). One end of the force application rod (23) is fixed to the threaded rod (22).

6. The convenient blood collection device according to claim 1, characterized in that, A torque sensor (28) is fixed to the outside of one of the support shafts (6), and a microcontroller (29) is fixed to one side of the side fixing box (2). The microcontroller (29) is electrically connected to the torque sensor (28) and the servo motor (3) via wires.

7. The convenient blood collection device according to claim 1, characterized in that, The top of the operating table (1) is provided with a limiting displacement groove (25) corresponding to the position of the mating moving seat (15). The limiting displacement groove (25) is slidably connected to the mating moving seat (15). Both sides of the mating moving seat (15) are fixed with anti-detachment moving protrusions (26). Both sides of the inside of the limiting displacement groove (25) are provided with side movable grooves (27) corresponding to the position of the anti-detachment moving protrusions (26). The anti-detachment moving protrusions (26) are slidably connected to the side movable grooves (27).

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