A wearable disinfection drug mixing device
By designing a wearable disinfection drug mixing device including a sprayer body, agitator and a feeding mechanism, the problem that the existing sprayer requires manual operation and causes the drug liquid to contact the skin, and the automatic mixing and feeding of the drug liquid is realized, reducing health risks and improving convenience.
Patent Information
- Application Number
- CN202421474073.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-25
AI Technical Summary
The existing sprayers for agricultural spraying require manual tearing of the liquid bag and pouring it into the feed barrel during use, resulting in the liquid easily contacting the user's skin and affecting physical health.
A wearable disinfection drug mixing device is designed, including a sprayer body, a spray mechanism, agitator, a feeding mechanism and a puncture mechanism. Through these mechanisms, the stirring, dilution and discharge of the drug liquid can be automatically completed to avoid direct contact between the drug liquid and the user's skin.
Automatic mixing and discharging of the medicine liquid is realized, which avoids direct contact between the user and the medicine liquid, reduces the health risks of the medicine liquid to the user, and improves the convenience of use.
Smart Images

Figure CN222707430U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sprayers, and in particular to a wearable disinfectant drug mixing device. Background Art
[0002] Wearable disinfectant mixing devices are wearable disinfectant sprayers, devices used to spray disinfectants or antiseptics, typically for thorough disinfection and sterilization of surfaces, air, or specific areas. These sprayers are designed to quickly and effectively spray disinfectants evenly into the target area to ensure the complete elimination or neutralization of germs, viruses, and other pathogens. They are primarily used in industries such as agriculture, healthcare, and transportation.
[0003] Although existing agricultural sprayers can mix and dilute liquid medicine, they still require manual tearing of the liquid medicine bag during use, and then pouring the liquid medicine into the feed barrel of the sprayer, and then diluting and mixing the liquid medicine. This method makes it easy for the liquid medicine in the liquid medicine bag to come into direct contact with the user's skin. Since the liquid medicine is highly toxic, this will affect the user's health. Utility Model Content
[0004] The purpose of the utility model is to provide a wearable disinfection drug mixing device to solve the problem that although the existing sprayer used for agricultural spraying can mix and dilute the drug liquid, it still needs to manually tear the drug liquid bag when in use, and then pour the drug liquid into the feed barrel of the sprayer, and then dilute and mix the drug liquid. This method causes the drug liquid in the drug liquid bag to easily come into direct contact with the user's skin. Since the drug liquid is highly toxic, this will affect the user's health.
[0005] The utility model provides the following technical solutions: a wearable disinfection drug mixing device, comprising a sprayer body, a spray mechanism is provided on the outside of the sprayer body, a handle and a water inlet are fixedly connected to the top of the sprayer body, a feed barrel is fixedly connected to the top of the sprayer body, a feeding mechanism for feeding the medicine liquid is provided on the inside of the feed barrel, a stirring mechanism for stirring and mixing the medicine liquid is provided on the inside of the feed barrel, and a piercing mechanism for piercing the medicine liquid bag is also provided on the inside of the feed barrel.
[0006] As a preferred embodiment of the above technical solution, the unloading mechanism includes a through hole provided at the bottom of the feeding barrel, a groove provided at the top of the through hole, a baffle inserted in the inner side of the groove, a sliding rod fixedly connected to the bottom of the baffle, a limiting plate fixedly connected to the top of the limiting plate, and a first spring fixedly connected to the top of the limiting plate. During use, the user can pierce the medicine liquid bag in the feeding barrel through the stirring mechanism and the piercing mechanism, and stir and mix the medicine liquid in the medicine liquid bag. After that, the user can pull the crank handle, and the movement of the crank handle drives the screw to move. Since the screw is threadedly connected to the sleeve at this time, the sleeve will be driven by the screw to move, and the movement of the sleeve drives the stirring shaft to move. The movement of the stirring shaft will drive the baffle to move. The baffle movement squeezes the first spring and drives the sliding rod and the limiting plate to move. When the baffle moves to a certain position, the through hole will be opened. At this time, the solution in the feeding barrel will fall into the sprayer body through the through hole. After that, an appropriate amount of water can be added through the water inlet, and the disinfectant can be sprayed through the spray mechanism, thereby realizing the unloading of the medicine liquid.
[0007] As a preferred embodiment of the above technical solution, a sealing block is fixedly connected to the bottom of the baffle, the diameter of the sealing block is adapted to the aperture of the through hole, the grooves are distributed at the inner bottom of the feed barrel, the diameter of the baffle is adapted to the inner diameter of the groove, the height of the baffle is adapted to the depth of the groove, there are four sliding rods, four limit plates and four first springs, one end of the four sliding rods is fixedly connected to the bottom of the baffle, and the other end of the four passes through the feed barrel and is fixedly connected to the four limit plates, one end of the four first springs is respectively fixedly connected to the top of the four limit plates, and the other end of the four first springs is fixedly connected to the bottom of the feed barrel, and the four first springs are respectively distributed on the outside of the four sliding rods.
[0008] As a preferred embodiment of the above technical solution, the stirring mechanism includes a sealing groove opened at the top of the feed barrel, a sealing cover is inserted into the inner side of the sealing groove, the inner side of the sealing cover is threadedly connected to a screw, the top of the screw is fixedly connected to a crank, the bottom of the screw is threadedly connected to a sleeve, and the bottom of the sleeve is fixedly connected to a stirring shaft.
[0009] As a preferred embodiment of the above technical solution, a sealing ring is fixedly connected to the bottom of the sealing cover, the size of the sealing ring is adapted to the sealing groove, a through-hole is provided on the sealing cover, the screw is slidingly connected to the sealing cover through the through-hole, an internal thread is provided on the inner side of the sleeve, the specification of the internal thread is adapted to the screw, a spiral blade is fixedly connected to the outer side of the stirring shaft, and the end of the stirring shaft away from the sleeve is rotatably connected to the top of the baffle through the bearing seat.
[0010] As a preferred embodiment of the above technical solution, the piercing mechanism includes a filter plate fixedly connected to the outside of the stirring shaft and four second springs fixedly connected to the top of the sealing cover, the top of the filter plate is provided with four positioning grooves, the end of the second spring away from the sealing cover is fixedly connected to a pressure ring, the bottom of the pressure ring is fixedly connected to a connecting rod, the end of the connecting rod away from the pressure ring passes through the sealing cover and is fixedly connected to a ring plate, the bottom of the ring plate is fixedly connected with a number of thorns distributed at equal angles, and the bottom of the ring plate is fixedly connected with four positioning rods. When in use, the user can place the medicine liquid bag on the filter plate on the stirring shaft and add an appropriate amount of water, and then insert the sealing ring at the bottom of the sealing cover into the sealing groove of the feed barrel, and then press the pressure ring. The movement of the pressure ring drives the connecting rod to move and squeezes the second spring. The movement of the connecting rod drives the ring plate to move, and the movement of the ring plate drives the thorns and positioning rods to move. When the thorns move to a certain position, they will pierce the medicine liquid bag on the filter plate, thereby releasing the medicine in the medicine liquid bag, and the positioning rods move to a certain position and insert into the positioning groove on the filter plate. At this time, the filter plate and the stirring shaft will be positioned The rod is fixed, and then the user can rotate the screw on the sealing cover into the sleeve at the top of the stirring shaft with the cooperation of the perforation. At this time, the screw is connected to the stirring shaft, and then the user can turn the crank, and the rotation of the crank drives the screw to rotate, and the rotation of the screw drives the stirring shaft to rotate. The rotation of the stirring shaft can stir the liquid and water in the feed barrel, thereby diluting the liquid. Then the user can discharge the liquid in the feed barrel into the sprayer body through the discharge mechanism. When the liquid bag needs to be processed, the user can press the pressure ring again. At this time, the pressure ring will drive the connecting rod and the ring plate to move again. Similarly, the positioning rod will be inserted into the positioning groove. At this time, the filter plate is fixed again, and then the user can separate the screw from the sleeve, and then the sealing cover can be removed from the feed barrel. Then, the liquid bag can be taken out of the feed barrel through the clip, thereby achieving stirring and mixing of the liquid while piercing the liquid, thereby avoiding direct contact between the user and the liquid, thereby avoiding the impact of the liquid on the user, and also convenient for the user to process the liquid bag.
[0011] As a preferred embodiment of the above technical solution, the diameter of the filter plate is adapted to the inner diameter of the feed barrel, one end of the four second springs is fixedly connected to the top of the sealing cover, and the other ends of the four second springs are fixedly connected to the bottom of the pressure ring, the number of connecting rods is the same as that of the second springs, one end of the four connecting rods is fixedly connected to the bottom of the pressure ring, and the other ends of the four connecting rods pass through the sealing cover and are fixedly connected to the ring plate, the four connecting rods are respectively distributed on the inner sides of the four second springs, there are four positioning rods, the positions of the four positioning rods correspond to the four positioning grooves, and the diameters of the four positioning rods are adapted to the inner diameters of the four positioning grooves.
[0012] Compared with the prior art, the beneficial effects of the present invention are:
[0013] The utility model comprises a sprayer body, a spray mechanism, a stirring mechanism, a feeding mechanism and a piercing mechanism. When in use, the user can place a bag containing liquid medicine on a filter plate on the stirring shaft and add an appropriate amount of water. Then, the sealing ring at the bottom of the sealing cover is clamped into the sealing groove of the feeding barrel. Then, the pressing ring is pressed, and the movement of the pressing ring drives the movement of the connecting rod, and squeezes the second spring. The movement of the connecting rod drives the movement of the ring plate, and the movement of the ring plate drives the movement of the thorn nail and the positioning rod. When the thorn nail moves to a certain position, it will pierce the bag containing liquid medicine on the filter plate, thereby releasing the medicine in the liquid medicine bag. The liquid is released, and the positioning rod moves to a certain position and is inserted into the positioning groove on the filter plate. At this time, the filter plate and the stirring shaft will be fixed by the positioning rod. Then the user can rotate the screw on the sealing cover into the sleeve on the top of the stirring shaft with the cooperation of the perforation. At this time, the screw is connected to the stirring shaft. Then the user can turn the crank, and the rotation of the crank drives the screw to rotate, and the rotation of the screw drives the stirring shaft to rotate. The rotation of the stirring shaft can stir the liquid and water in the feed barrel, thereby diluting the liquid. When the mixing is completed, the user can pull the crank. The movement drives the screw to move. Since the screw is threadedly connected to the sleeve at this time, the sleeve will be driven by the screw to move, and the movement of the sleeve drives the stirring shaft to move. The movement of the stirring shaft drives the baffle to move. The baffle moves to squeeze the first spring and drives the slide bar and the limit plate to move. When the baffle moves to a certain position, it will open the through hole. At this time, the solution in the feed barrel will fall into the sprayer body through the through hole. After use, after adding an appropriate amount of water through the water inlet, the disinfectant can be sprayed through the spray mechanism. When the liquid medicine bag needs to be processed, the user can Press the pressure ring again, and the pressure ring will drive the connecting rod and the ring plate to move again. Similarly, the positioning rod will be inserted into the positioning groove, and the filter plate will be fixed again. Then the user can separate the screw from the sleeve, and then remove the sealing cover from the feed barrel. Then, the liquid medicine bag can be taken out from the feed barrel through the clip, which can achieve the purpose of stirring and mixing the liquid medicine while avoiding direct contact between the user and the liquid medicine, thereby avoiding the impact of the liquid medicine on the user, and also making it convenient for the user to handle the liquid medicine bag, thereby improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a first-person perspective diagram of a wearable disinfectant mixing device;
[0015] Figure 2 This is a schematic side cross-sectional view of a wearable disinfection drug mixing device;
[0016] Figure 3 This is an enlarged schematic diagram of the feed barrel structure in a wearable disinfectant mixing device;
[0017] Figure 4 A schematic side cross-sectional view of the feed barrel structure in a wearable disinfectant mixing device;
[0018] Figure 5for Figure 2 A schematic diagram of the structure at center A;
[0019] Figure 6 for Figure 2 A magnified schematic diagram of the structure at point B in the middle.
[0020] In the figure: 1. sprayer body; 2. spray mechanism; 3. feed barrel; 4. handle; 5. water inlet; 11. through hole; 12. groove; 13. baffle; 14. slide bar; 15. limit plate; 16. first spring; 21. filter plate; 22. second spring; 23. positioning groove; 24. pressure ring; 25. connecting rod; 26. ring plate; 27. spike; 28. positioning rod; 31. sealing groove; 32. sealing cover; 33. screw; 34. crank; 35. sleeve; 36. stirring shaft. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.
[0022] Example 1
[0023] like Figure 1-Figure 5As shown, the utility model provides a technical solution: a wearable disinfection drug mixing device, comprising a sprayer body 1, a spray mechanism 2 is provided on the outside of the sprayer body 1, a handle 4 and a water inlet 5 are fixedly connected to the top of the sprayer body 1, a feed barrel 3 is fixedly connected to the top of the sprayer body 1, a feeding mechanism for feeding the liquid medicine is provided on the inside of the feed barrel 3, a stirring mechanism for stirring and mixing the liquid medicine is provided on the inside of the feed barrel 3, a piercing mechanism for piercing the liquid medicine bag is also provided on the inside of the feed barrel 3, the stirring mechanism includes a sealing groove 31 opened on the top of the feed barrel 3, and the inner side of the sealing groove 31 is provided. A sealing cover 32 is inserted, and a screw 33 is threadedly connected to the inner side of the sealing cover 32. The top of the screw 33 is fixedly connected to a crank 34, and the bottom of the screw 33 is threadedly connected to a sleeve 35. The bottom of the sleeve 35 is fixedly connected to a stirring shaft 36. A sealing ring is fixedly connected to the bottom of the sealing cover 32, and the size of the sealing ring is adapted to the sealing groove 31. A perforation is provided on the sealing cover 32, and the screw 33 is slidably connected to the sealing cover 32 through the perforation. An internal thread is provided on the inner side of the sleeve 35, and the specification of the internal thread is adapted to the screw 33. A spiral blade is fixedly connected to the outer side of the stirring shaft 36, and the end of the stirring shaft 36 away from the sleeve 35 rotates through the bearing seat. The filter plate 21 is fixedly connected to the outside of the stirring shaft 36 and four second springs 22 are fixedly connected to the top of the sealing cover 32. Four positioning grooves 23 are provided on the top of the filter plate 21. The end of the second spring 22 away from the sealing cover 32 is fixedly connected to the pressure ring 24. The bottom of the pressure ring 24 is fixedly connected to the connecting rod 25. The end of the connecting rod 25 away from the pressure ring 24 passes through the sealing cover 32 and is fixedly connected to the ring plate 26. The bottom of the ring plate 26 is fixedly connected to a number of thorns 27 distributed at equal angles. The bottom of the ring plate 26 is fixedly connected to four positioning rods 28. The diameter of the filter plate 21 is the same as the inner side of the feed barrel 3. The diameters are adapted, one end of the four second springs 22 is fixedly connected to the top of the sealing cover 32, and the other ends of the four second springs 22 are fixedly connected to the bottom of the pressure ring 24, the number of connecting rods 25 is the same as that of the second springs 22, one end of the four connecting rods 25 is fixedly connected to the bottom of the pressure ring 24, and the other ends of the four connecting rods 25 pass through the sealing cover 32 and are fixedly connected to the ring plate 26, the four connecting rods 25 are respectively distributed on the inner sides of the four second springs 22, there are four positioning rods 28, the positions of the four positioning rods 28 correspond to the four positioning grooves 23, and the diameters of the four positioning rods 28 are adapted to the inner diameters of the four positioning grooves 23.
[0024] The user can then press the screw 33 on the sealing cover 32 into the sleeve 35 at the top of the stirring shaft 36, and then the screw 33 is rotated into the sleeve 35 at the top of the stirring shaft 36, and the screw 33 is connected to the stirring shaft 36, and then the user can turn the crank 34. The rotation of the crank 34 drives the screw 33 to rotate, and the rotation of the screw 33 drives the stirring shaft 36 to rotate. The rotation of the stirring shaft 36 can stir the liquid medicine and water in the feed barrel 3, thereby diluting the liquid medicine. After that, the user can discharge the liquid medicine in the feed barrel 3 into the sprayer body 1 through the discharge mechanism. When the liquid medicine bag needs to be processed, the user can press the pressure ring 24 again. At this time, the pressure ring 24 will drive the connecting rod 25 and the ring plate 26 to move again. Similarly, the positioning rod 28 will be inserted into the positioning groove 23. At this time, the filter plate 21 is fixed again. Then the user can separate the screw 33 from the sleeve 35, and then the sealing cover 32 can be removed from the feed barrel 3. After that, the liquid medicine bag can be taken out from the feed barrel 3 through the clip, thereby achieving stirring and mixing of the liquid medicine while piercing the liquid medicine, thereby avoiding direct contact between the user and the liquid medicine, thereby avoiding the influence of the liquid medicine on the user, and also facilitating the user to process the liquid medicine bag.
[0025] Example 2
[0026] like Figure 2 、 Figure 3 、 Figure 4 and Figure 6As shown, the utility model provides a technical solution: a wearable disinfection drug mixing device, comprising a sprayer body 1, a spray mechanism 2 is provided on the outside of the sprayer body 1, a handle 4 and a water inlet 5 are fixedly connected to the top of the sprayer body 1, a feeding barrel 3 is fixedly connected to the top of the sprayer body 1, a feeding mechanism for feeding the medicine liquid is provided on the inside of the feeding barrel 3, a stirring mechanism for stirring and mixing the medicine liquid is provided on the inside of the feeding barrel 3, a piercing mechanism for piercing the medicine liquid bag is also provided on the inside of the feeding barrel 3, the feeding mechanism comprises a through hole 11 provided at the bottom of the feeding barrel 3, a groove 12 is provided at the top of the through hole 11, a baffle 13 is inserted into the inside of the groove 12, a slide rod 14 is fixedly connected to the bottom of the baffle 13, and a limit plate 1 is fixedly connected to the bottom of the slide rod 14 5. The top of the limit plate 15 is fixedly connected with a first spring 16, and the bottom of the baffle 13 is fixedly connected with a sealing block. The diameter of the sealing block is adapted to the aperture of the through hole 11. The grooves 12 are distributed at the inner bottom of the feed barrel 3. The diameter of the baffle 13 is adapted to the inner diameter of the groove 12. The height of the baffle 13 is adapted to the depth of the groove 12. There are four slide bars 14, limit plates 15 and first springs 16. One end of the four slide bars 14 is fixedly connected to the bottom of the baffle 13, and the other end of the four passes through the feed barrel 3 and is fixedly connected to the four limit plates 15. One end of the four first springs 16 is respectively fixedly connected to the top of the four limit plates 15, and the other end of the four first springs 16 is fixedly connected to the bottom of the feed barrel 3. The four first springs 16 are respectively distributed on the outside of the four slide bars 14.
[0027] Through the above technical solution, when in use, the user can pierce the medicine bag in the feed barrel 3 through the stirring mechanism and the piercing mechanism, and stir and mix the medicine in the medicine bag, and then the user can pull the crank 34, and the movement of the crank 34 drives the screw 33 to move. Since the screw 33 is threadedly connected to the sleeve 35 at this time, the sleeve 35 will be driven by the screw 33 to move, and the movement of the sleeve 35 drives the stirring shaft 36 to move. The movement of the stirring shaft 36 will drive the baffle 13 to move, and the movement of the baffle 13 will squeeze the first spring 16 and drive the slide bar 14 and the limit plate 15 to move. When the baffle 13 moves to a certain position, it will open the through hole 11. At this time, the solution in the feed barrel 3 will fall into the sprayer body 1 through the through hole 11. After that, after adding an appropriate amount of water through the water inlet 5, the disinfectant can be sprayed through the spray mechanism 2, thereby realizing the discharge of the medicine.
[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.
Claims
1. A wearable disinfection drug mixing device, comprising a sprayer body (1), a spray mechanism (2) is arranged on the outside of the sprayer body (1), a handle (4) and a water inlet (5) are fixedly connected to the top of the sprayer body (1), and the device is characterized in that: A feed barrel (3) is fixedly connected to the top of the sprayer body (1), a feeding mechanism for feeding the medicine liquid is arranged on the inner side of the feed barrel (3), a stirring mechanism for stirring and mixing the medicine liquid is arranged on the inner side of the feed barrel (3), and a piercing mechanism for piercing the medicine liquid bag is also arranged on the inner side of the feed barrel (3).
2. A wearable disinfection drug mixing device according to claim 1, characterized in that: The unloading mechanism comprises a through hole (11) provided at the bottom of the feeding barrel (3), a groove (12) provided at the top of the through hole (11), a baffle (13) inserted into the inner side of the groove (12), a sliding rod (14) fixedly connected to the bottom of the baffle (13), a limiting plate (15) fixedly connected to the bottom of the sliding rod (14), and a first spring (16) fixedly connected to the top of the limiting plate (15).
3. A wearable disinfection drug mixing device according to claim 2, characterized in that: A sealing block is fixedly connected to the bottom of the baffle (13), and the diameter of the sealing block is adapted to the aperture of the through hole (11). The groove (12) is distributed at the inner bottom of the feed barrel (3). The diameter of the baffle (13) is adapted to the inner diameter of the groove (12). The height of the baffle (13) is adapted to the depth of the groove (12). There are four slide bars (14), limit plates (15) and first springs (16). One end of the four slide bars (14) is fixedly connected to the bottom of the baffle (13), and the other end of the four slide bars (14) passes through the feed barrel (3) and is fixedly connected to the four limit plates (15). One end of the four first springs (16) is respectively fixedly connected to the top of the four limit plates (15), and the other end of the four first springs (16) is fixedly connected to the bottom of the feed barrel (3). The four first springs (16) are respectively distributed on the outside of the four slide bars (14).
4. A wearable disinfection drug mixing device according to claim 1, characterized in that: The stirring mechanism comprises a sealing groove (31) opened at the top of the feed barrel (3), a sealing cover (32) is inserted into the inner side of the sealing groove (31), a screw (33) is threadedly connected to the inner side of the sealing cover (32), a crank (34) is fixedly connected to the top of the screw (33), a sleeve (35) is threadedly connected to the bottom of the screw (33), and a stirring shaft (36) is fixedly connected to the bottom of the sleeve (35).
5. A wearable disinfection drug mixing device according to claim 4, characterized in that: A sealing ring is fixedly connected to the bottom of the sealing cover (32), and the size of the sealing ring is matched with the sealing groove (31). A through hole is provided on the sealing cover (32), and the screw rod (33) is slidably connected to the sealing cover (32) through the through hole. An internal thread is provided on the inner side of the sleeve (35), and the specification of the internal thread is matched with the screw rod (33). A spiral blade is fixedly connected to the outer side of the stirring shaft (36), and the end of the stirring shaft (36) away from the sleeve (35) is rotatably connected to the top of the baffle (13) through a bearing seat.
6. A wearable disinfection drug mixing device according to claim 3, characterized in that: The piercing mechanism comprises a filter plate (21) fixedly connected to the outside of the stirring shaft (36) and four second springs (22) fixedly connected to the top of the sealing cover (32); four positioning grooves (23) are provided on the top of the filter plate (21); one end of the second spring (22) away from the sealing cover (32) is fixedly connected to a pressure ring (24); the bottom of the pressure ring (24) is fixedly connected to a connecting rod (25); one end of the connecting rod (25) away from the pressure ring (24) passes through the sealing cover (32) and is fixedly connected to a ring plate (26); the bottom of the ring plate (26) is fixedly connected to a plurality of piercing nails (27) distributed at equal angles; and the bottom of the ring plate (26) is fixedly connected to four positioning rods (28).
7. A wearable disinfection drug mixing device according to claim 6, characterized in that: The diameter of the filter plate (21) is matched with the inner diameter of the feed barrel (3), one end of the four second springs (22) is fixedly connected to the top of the sealing cover (32), and the other ends of the four second springs (22) are fixedly connected to the bottom of the pressure ring (24), the number of the connecting rods (25) is the same as that of the second springs (22), one end of the four connecting rods (25) is fixedly connected to the bottom of the pressure ring (24), and the other ends of the four connecting rods (25) pass through the sealing cover (32) and are fixedly connected to the ring plate (26), the four connecting rods (25) are respectively distributed on the inner sides of the four second springs (22), there are four positioning rods (28), the positions of the four positioning rods (28) correspond to the four positioning grooves (23), and the diameters of the four positioning rods (28) are matched with the inner diameters of the four positioning grooves (23).