Traditional Chinese medicine residue treatment equipment

Abstract

The utility model relates to traditional Chinese medicine residue treatment equipment which comprises a shell, the interior of the shell is divided into a working bin, a treatment bin and a heating bin through partition plates, a rotating rod is arranged in the working bin, one end of the rotating rod is coaxially and fixedly connected with a pressing plate, the other end of the rotating rod is coaxially provided with a threaded hole, a threaded rod is arranged in the threaded hole, and a motor is installed in the working bin. A magnetic ring plate is arranged in the working bin, a sliding groove is formed in the peripheral face of the rotating rod, a sliding rod is fixedly connected to the side wall of an inner hole of the magnetic ring plate, a net bin is arranged in the treatment bin, an opening is coaxially formed in the side wall of the side, facing the rotating rod, of the net bin, a net cover is arranged at the top of the net bin, a rotating shaft is coaxially and fixedly connected to the net bin, and a heating plate is arranged in the heating bin. The medicine residue drying device has the advantages that workers can conveniently spin-dry water in medicine residues and extrude the medicine residues into blocks, the medicine residues are heated through the heating plate, the medicine residues are dried to remove the water, follow-up transportation, storage and use are facilitated, the dead weight of the device can be reduced, and the workers can conveniently move the device.

Description

Technical Field

[0001] This utility model relates to the technical field of traditional Chinese medicine processing equipment, specifically to a device for processing traditional Chinese medicine residue. Background Technology

[0002] Traditional Chinese medicine factories generate a large amount of medicinal residue during production. The usual methods of disposal are stockpiling and incineration, which previously caused environmental pollution, and the high moisture content of the residue made it highly susceptible to spoilage and mold. To address these issues, some factories have experimented with reusing the residue. After processing, the residue can be used as external medicine, such as for hot compresses, or for edible fungi cultivation, poultry and livestock feed, organic fertilizer, and as fuel. However, the residue is typically bagged for transportation and storage, taking up considerable space and causing inconvenience.

[0003] To address these technical issues, the existing technology CN217616744U provides a traditional Chinese medicine residue processing device. This device uses the rotation of a mesh bin to create centrifugal force, which removes the moisture from the residue. The residue is then compressed into blocks by a pressure plate and heated by a heating plate to further dry it and remove moisture, facilitating subsequent transportation, storage, and use.

[0004] However, there may be some technical problems during its use. For example, when the device is in use, the motor and cylinder need to be turned on or off separately to drive the mesh bin to rotate, dry the water in the dregs, and move the pressure plate to squeeze the dregs into blocks. However, this may make the operation of the staff cumbersome and inconvenient to dry the water in the dregs and squeeze them into blocks. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a Chinese herbal medicine residue processing device that not only allows workers to easily remove moisture from the residue and compress it into blocks, but also heats it with a heating plate to dry it and remove moisture, facilitating subsequent transportation, storage, and use, but also reduces the weight of the device and makes it easier for workers to move it.

[0006] This utility model is achieved through the following technical solution: a device for treating Chinese herbal medicine residue, comprising a shell, the shell being divided into a working chamber, a processing chamber, and a heating chamber by a partition. A rotating rod is installed in the working chamber, one end of which extends laterally along the left-right direction of the shell, passing through the partition into the processing chamber. A pressure plate is coaxially fixed to one end of the rotating rod, and a threaded hole is coaxially formed at the other end of the rotating rod, within which a threaded rod is installed. A motor is installed in the working chamber, the output end of which is coaxially fixed to the end of the threaded rod furthest from the processing chamber. A magnetic ring plate, rotatably connected to the partition, is installed in the working chamber, and the rotating rod is located within the inner hole of the magnetic ring plate. The rotating rod is coaxial with the magnetic ring plate. A sliding groove extending laterally in the left-right direction is opened on the outer circumference of the rotating rod. A sliding rod extending into the sliding groove is fixed to the inner hole side wall of the magnetic ring plate. A mesh chamber is provided in the processing chamber. An opening adapted to the pressure plate is opened coaxially on the side wall of the mesh chamber facing the rotating rod. A mesh cover is provided on the top of the mesh chamber. The mesh cover is locked by a switching mechanism fixed to the top of the mesh chamber. A rotating shaft is fixed coaxially on the side wall of the mesh chamber away from the rotating rod. One end of the rotating shaft extends through the partition to the heating chamber in the direction away from the mesh chamber and is rotatably connected to the heating chamber. A heating plate fixed to the partition is provided in the heating chamber.

[0007] In use, this utility model features a housing that is divided into a working chamber, a processing chamber, and a heating chamber by a partition. A rotating rod is installed in the working chamber, with one end extending laterally through the partition into the processing chamber. A pressure plate is coaxially fixed to one end of the rotating rod, and a threaded hole is coaxially formed at the other end, housing a threaded rod. A motor is installed in the working chamber, with its output end coaxially fixed to the end of the threaded rod furthest from the processing chamber. A magnetic ring plate rotatably connected to the partition is also installed in the working chamber. The rotating rod is located within the inner hole of the magnetic ring plate and is coaxial with it. A sliding groove extending laterally in the left-right direction is formed on the outer circumference of the rotating rod. A pressure plate is fixed to the inner wall of the magnetic ring plate. The sliding rod extends towards the rotating rod into the chute. A mesh bin is installed inside the processing chamber. An opening, compatible with a pressure plate, is coaxially opened on the side wall of the mesh bin facing the rotating rod. A mesh cover is installed on the top of the mesh bin, locked by a switching mechanism fixed to the top of the mesh bin. A rotating shaft is coaxially fixed to the side wall of the mesh bin away from the rotating rod. One end of the rotating shaft extends away from the mesh bin, passes through a partition, and rotatably connects to the heating chamber. A heating plate, fixed to the partition, is installed inside the heating chamber. During operation, by controlling the switching mechanism, the mesh cover and mesh bin are no longer locked, allowing the mesh cover to be opened, dregs to be placed into the mesh bin, and then the mesh cover is closed again. Controlling the switching mechanism again allows the mesh cover and mesh bin to be switched on and off again. After the mechanism is locked, the motor is started, causing the motor output to drive the threaded rod to rotate within the threaded hole. At this time, the magnetic ring plate and the partition plate are attracted and fixed together. Due to the limiting effect of the sliding rod and the sliding groove, the rotating rod will not rotate on the partition plate under the drive of the threaded rod, but will move away from the motor under the drive of the threaded rod, causing the sliding rod to move within the sliding groove. This causes the pressure plate to move away from the motor within the opening and enter the mesh bin, thereby compressing the medicine residue in the mesh bin into blocks. Once the medicine residue in the mesh bin is compressed into blocks, the pressure plate can no longer move away from the motor, while the threaded rod continues to rotate under the drive of the motor output. At this point, the rotating rod will... Driven by a motor and a threaded rod, the magnetic ring plate rotates through a transmission between a sliding groove and a sliding rod, overcoming the adsorption and fixation between the magnetic ring plate and the partition plate. This causes the pressure plate to rotate, and the mesh bin rotates along with the pressure plate, causing the rotating shaft to rotate on the heating chamber. This process removes moisture from the dregs. Then, the heating plate is activated to heat and dry the lumpy dregs in the processing chamber. Finally, the lumpy dregs are removed from the mesh bin. This method not only allows workers to easily remove moisture from the dregs and compress them into lumps, but also dries them by heating, facilitating subsequent transportation, storage, and use. It also reduces the weight of the device, making it easier for workers to move.

[0008] Preferably, the processing chamber has a feed inlet at the top and a water outlet at the bottom. This design allows workers to easily add medicinal residue into the chamber and allows the water from the discarded residue to be discharged outside the processing chamber through the water outlet.

[0009] Preferably, a cover is provided inside the feed inlet, and a hinged hinge is provided on the top of the housing. The housing and the top of the cover are hinged together by the hinged hinge. A support plate is provided inside the processing chamber, fixed to the partition and located above the mesh chamber. The cover rests on the top of the support plate. By providing a cover inside the feed inlet, a hinged hinge on the top of the housing, and a support plate fixed to the partition and located above the mesh chamber, the cover rests on the top of the support plate. During use, the cover, hinged hinge, and support plate can seal the feed inlet, preventing water from the dregs from splashing out of the feed inlet during operation. By rotating the cover around the hinge on the housing, the cover detaches from the top of the support plate, thus opening the feed inlet and facilitating the feeding of dregs into the mesh chamber.

[0010] Preferably, the outlet of the treatment chamber is configured as an inverted conical opening. By configuring the outlet of the treatment chamber as an inverted conical opening, it is possible to facilitate the discharge of water from the thrown-out dregs to the outside of the treatment chamber.

[0011] Preferably, a support leg is fixedly connected to the bottom of the housing. By fixing the support leg to the bottom of the housing, it is convenient for workers to place the device.

[0012] Preferably, the switching mechanism includes a first fixing block fixed to the top of the mesh compartment and a second fixing block fixed to the top of the mesh cover. The first fixing block and the second fixing block are arranged opposite to each other. The second fixing block has an insertion hole, and the first fixing block has a slot corresponding to the insertion hole. A spring and a pin are provided on the side wall of the second fixing block away from the first fixing block. The pin passes through the spring and the insertion hole and extends into the slot. The two ends of the spring are fixedly connected to the side wall of the second fixing block away from the first fixing block and the pin, respectively. The switching mechanism includes a first fixing block fixed to the top of the mesh bin and a second fixing block fixed to the top of the mesh cover. The first fixing block and the second fixing block are arranged opposite each other. The second fixing block has an insertion hole, and the first fixing block has a slot corresponding to the insertion hole. A spring and a pin are arranged on the side wall of the second fixing block away from the first fixing block. The pin passes through the spring and the insertion hole and extends into the slot. The two ends of the spring are fixedly connected to the side wall of the second fixing block away from the first fixing block and the pin, respectively. When the device is in use, by controlling the pin to move away from the first fixing block, the end of the pin facing the first fixing block is dislodged from the slot and moves into the insertion hole, so that the mesh cover and the mesh bin are no longer locked by the switching mechanism, and the spring is stretched, thereby opening the mesh cover and making it convenient for the staff to put the dregs into the mesh bin.

[0013] The beneficial effects of this utility model are as follows: By setting up a shell, the shell is divided into a working chamber, a processing chamber, and a heating chamber by a partition. A rotating rod is set in the working chamber. One end of the rotating rod extends laterally along the left and right direction of the shell, passes through the partition, and enters the processing chamber. A pressure plate is coaxially fixed to one end of the rotating rod, and a threaded hole is opened coaxially at the other end of the rotating rod. A threaded rod is set in the threaded hole. A motor is installed in the working chamber. The output end of the motor is coaxially fixed to the end of the threaded rod away from the processing chamber. A magnetic ring plate is set in the working chamber and rotatably connected to the partition. The rotating rod is located in the inner hole of the magnetic ring plate and is coaxial with the magnetic ring plate. A sliding groove extending laterally along the left and right direction is opened on the outer circumference of the rotating rod. A pressure plate is fixed to the inner wall of the magnetic ring plate. The sliding rod extends towards the rotating rod into the chute. A mesh bin is installed inside the processing chamber. An opening, compatible with a pressure plate, is coaxially opened on the side wall of the mesh bin facing the rotating rod. A mesh cover is installed on the top of the mesh bin, locked by a switching mechanism fixed to the top of the mesh bin. A rotating shaft is coaxially fixed to the side wall of the mesh bin away from the rotating rod. One end of the rotating shaft extends away from the mesh bin, passes through a partition, and rotatably connects to the heating chamber. A heating plate, fixed to the partition, is installed inside the heating chamber. During operation, by controlling the switching mechanism, the mesh cover and mesh bin are no longer locked, allowing the mesh cover to be opened, dregs to be placed into the mesh bin, and then the mesh cover is closed again. Controlling the switching mechanism again allows the mesh cover and mesh bin to be switched on and off again. After the mechanism is locked, the motor is started, causing the motor output to drive the threaded rod to rotate within the threaded hole. At this time, the magnetic ring plate and the partition plate are attracted and fixed together. Due to the limiting effect of the sliding rod and the sliding groove, the rotating rod will not rotate on the partition plate under the drive of the threaded rod, but will move away from the motor under the drive of the threaded rod, causing the sliding rod to move within the sliding groove. This causes the pressure plate to move away from the motor within the opening and enter the mesh bin, thereby compressing the medicine residue in the mesh bin into blocks. Once the medicine residue in the mesh bin is compressed into blocks, the pressure plate can no longer move away from the motor, while the threaded rod continues to rotate under the drive of the motor output. At this point, the rotating rod will... Driven by a motor and a threaded rod, the magnetic ring plate rotates through a transmission between a sliding groove and a sliding rod, overcoming the adsorption and fixation between the magnetic ring plate and the partition plate. This causes the pressure plate to rotate, and the mesh bin rotates along with the pressure plate, causing the rotating shaft to rotate on the heating chamber. This process removes moisture from the dregs. Then, the heating plate is activated to heat and dry the lumpy dregs in the processing chamber. Finally, the lumpy dregs are removed from the mesh bin. This method not only allows workers to easily remove moisture from the dregs and compress them into lumps, but also dries them by heating, facilitating subsequent transportation, storage, and use. It also reduces the weight of the device, making it easier for workers to move. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2for Figure 1 Structural perspective view;

[0016] Figure 3 for Figure 2 Structural perspective view;

[0017] Figure 4 for Figure 3 Schematic diagram of part A in the middle;

[0018] Figure 5 for Figure 3 Schematic diagram of Part B in the middle section;

[0019] Figure 6 for Figure 3 Schematic diagram of part C

[0020] As shown in the figure:

[0021] 1. Working chamber, 2. Support leg, 3. Processing chamber, 4. Hinged joint, 5. Heating chamber, 6. Water outlet, 7. Motor, 8. Threaded rod, 9. Mesh cover, 10. Rotating rod, 11. Threaded hole, 12. Pressure plate, 13. Heating plate, 14. Mesh chamber, 15. Rotating shaft, 16. Partition plate, 17. Magnetic ring plate, 18. Feed inlet, 19. Shell cover, 20. Slide groove, 21. Slide rod, 22. Support plate, 23. Slot, 24. Opening, 25. First fixing block, 26. Second fixing block, 27. Pin, 28. Insertion hole, 29. Shell, 30. Spring. Detailed Implementation

[0022] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0023] like Figures 1-6The present invention discloses a traditional Chinese medicine residue treatment device, comprising a housing 29. The housing 29 is divided into a working chamber 1, a processing chamber 3, and a heating chamber 5 by a partition 16. A rotating rod 10 is installed in the working chamber 1. One end of the rotating rod 10 extends laterally along the left-right direction of the housing 29, passing through the partition 16 into the processing chamber 3. A pressure plate 12 is coaxially fixed to one end of the rotating rod 10. A threaded hole 11 is coaxially formed at the other end of the rotating rod 10, and a threaded rod 8 is installed within the threaded hole 11. A motor 7 is installed in the working chamber 1. The output end of the motor 7 is coaxially fixed to the end of the threaded rod 8 away from the processing chamber 3. A magnetic ring plate 17 is rotatably connected to the partition 16 in the working chamber 1. The rotating rod 10 is located in the inner hole of the magnetic ring plate 17 and is connected to the magnetic ring plate 17. The rotating rod 10 is coaxially arranged with a groove 20 extending laterally in the left-right direction on its outer circumferential surface. A sliding rod 21 extending towards the rotating rod 10 into the groove 20 is fixedly connected to the inner hole side wall of the magnetic ring plate 17. A mesh chamber 14 is provided in the processing chamber 3. An opening 24 adapted to the pressure plate 12 is coaxially opened on the side wall of the mesh chamber 14 facing the rotating rod 10. A mesh cover 9 is provided on the top of the mesh chamber 14. The mesh cover 9 is locked by a switch mechanism fixedly connected to the top of the mesh chamber 14. A rotating shaft 15 is coaxially fixedly connected to the side wall of the mesh chamber 14 away from the rotating rod 10. One end of the rotating shaft 15 extends away from the mesh chamber 14, passes through the partition 16 into the heating chamber 5, and is rotatably connected to the heating chamber 5. A heating plate 13 fixedly connected to the partition 16 is provided in the heating chamber 5.

[0024] By providing an inlet 18 at the top of the processing chamber 3 and an outlet 6 at the bottom, it is convenient for workers to put medicinal residue into the mesh bin 14 and for the water in the discarded medicinal residue to be discharged out of the processing chamber 3 through the outlet 6. A cover 19 is installed inside the inlet 18, and a hinge 4 is installed at the top of the housing 29. The housing 29 and the cover 19 are hinged together by the hinge 4. A support plate 22, fixed to the partition 16 and located above the mesh bin 14, is installed inside the processing chamber 3. The cover 19 presses against the top of the support plate 22. During use, the cover 19, the hinge 4, and the support plate 22 can seal the inlet 18 to prevent water in the discarded medicinal residue from splashing out. By rotating the cover 19 around the hinge 4 on the housing 29, the cover 19 is disengaged from the top of the support plate 22, thus opening the inlet 18 and facilitating the addition of medicinal residue into the mesh bin 14. By setting the outlet 6 of the treatment chamber 3 as an inverted cone shape, the water in the discarded dregs can be easily discharged to the outside of the treatment chamber 3 through the outlet 6. By fixing the support leg 2 to the bottom of the shell 29, the support leg 2 facilitates the placement of the device by the staff. The switching mechanism includes a first fixing block 25 fixed to the top of the mesh compartment 14 and a second fixing block 26 fixed to the top of the mesh cover 9. The first fixing block 25 and the second fixing block 26 are arranged opposite to each other. The second fixing block 26 has an insertion hole 28, and the first fixing block 25 has a slot 23 corresponding to the insertion hole 28. A spring 30 and a pin 27 are arranged on the side wall of the second fixing block 26 away from the first fixing block 25. The pin 27 passes through the spring 30 and the insertion hole 28 and extends into the slot 23. The two ends of the spring 30 are fixedly connected to the side wall of the second fixing block 26 away from the first fixing block 25 and the pin 27, respectively. When the device is in use, by controlling the pin 27 to move away from the first fixing block 25, the end of the pin 27 facing the first fixing block 25 is dislodged from the slot 23 and moves into the insertion hole 28, so that the mesh cover 9 and the mesh compartment 14 are no longer locked by the switching mechanism, and the spring 30 is stretched, thereby opening the mesh cover 9, making it convenient for the staff to put the medicine residue into the mesh compartment 14.

[0025] Combined with appendix Figure 1-6The method of using this utility model is as follows: First, the support leg 2 is needed to place the device. Then, by rotating the cover 19 around the hinge 4 on the housing 29, the cover 19 is disengaged from the top of the support plate 22, thereby opening the feed port 18. The pin 27 is then moved away from the first fixed block 25, causing the end of the pin 27 facing the first fixed block 25 to disengage from the slot 23 and move into the insertion hole 28. This prevents the mesh cover 9 and the mesh chamber 14 from being locked by the switching mechanism, and stretches the spring 30, thereby rotating and opening the mesh cover 9, allowing the dregs to be placed into the mesh chamber 14. Finally, the mesh cover 9 is rotated back to its initial position. Positioning the pin 27 so that the end facing the first fixing block 25 is driven by the spring 30 to re-enter the slot 23 from the insertion hole 28, thereby closing the mesh cover 9. Then, by controlling the shell cover 19 to return to the initial position around the hinge 4, the shell cover 19 contacts the top of the support plate 22, thereby closing the feed port 18 again. Then, the motor 7 is started, so that the output end of the motor 7 drives the threaded rod 8 to rotate in the threaded hole 11. At this time, the magnetic ring plate 17 and the partition plate 16 are attracted and fixed together. The rotating rod 10 is limited by the sliding rod 21 and the sliding groove 20 and will not move on the partition plate 16 under the drive of the threaded rod 8. Instead of rotating, the screw rod 8 will move away from the motor 7 under the drive of the screw rod 8, and the slide rod 21 will move within the slide groove 20, causing the pressure plate 12 to also move away from the motor 7 within the opening 24 and enter the mesh bin 14, thereby compressing the medicine residue in the mesh bin 14 into blocks. After the medicine residue in the mesh bin 14 is compressed into blocks, the pressure plate 12 can no longer move away from the motor 7, while the screw rod 8 continues to rotate under the drive of the output end of the motor 7. At this time, the rotating rod 10 will rotate under the drive of the motor 7 and the screw rod 8, and through the transmission between the slide groove 20 and the slide rod 21, the magnetic ring plate 17 will overcome the resistance to the motor 7. The adsorption and fixation between the partitions 16 cause the partitions 16 to rotate, thereby driving the pressure plate 12 to rotate. The mesh bin 14, along with the rotation of the pressure plate 12, causes the rotating shaft 15 to rotate on the heating chamber 5, thereby removing the moisture from the dregs. Then, the heating plate 13 is activated to heat and dry the blocky dregs in the processing chamber 3. Finally, the blocky dregs are taken out from the mesh bin 14. This not only makes it convenient for workers to remove the moisture from the dregs and squeeze them into blocks, but also allows the dregs to be dried and dehydrated by heating with the heating plate 13, facilitating subsequent transportation, storage and use. It also reduces the weight of the device, making it easier for workers to move the device.

[0026] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A device for treating Chinese herbal medicine residue, comprising a shell (29), wherein the shell (29) is divided into a working chamber (1), a processing chamber (3), and a heating chamber (5) by a partition (16), characterized in that: A rotating rod (10) is provided inside the working chamber (1). One end of the rotating rod (10) extends laterally along the left and right direction of the shell (29), passes through the partition (16), and enters the processing chamber (3). A pressure plate (12) is coaxially fixed to one end of the rotating rod (10). A threaded hole (11) is coaxially opened at the other end of the rotating rod (10). A threaded rod (8) is provided inside the threaded hole (11). A motor (7) is installed inside the working chamber (1). The output end of the motor (7) is coaxially fixed to the end of the threaded rod (8) away from the processing chamber (3). A magnetic ring plate (17) is provided inside the working chamber (1) and rotatably connected to the partition (16). The rotating rod (10) is located in the inner hole of the magnetic ring plate (17) and is coaxial with the magnetic ring plate (17). A sliding groove (2) extending laterally along the left and right direction is opened on the outer circumferential surface of the rotating rod (10). 0), the inner hole sidewall of the magnetic ring plate (17) is fixedly connected to a slide rod (21) extending toward the rotating rod (10) into the slide groove (20), the processing chamber (3) is provided with a mesh chamber (14), the mesh chamber (14) is coaxially opened on the side wall facing the rotating rod (10) with an opening (24) adapted to the pressure plate (12), the top of the mesh chamber (14) is provided with a mesh cover (9), the mesh cover (9) is locked by a switch mechanism fixedly connected to the top of the mesh chamber (14), the side wall of the mesh chamber (14) away from the rotating rod (10) is coaxially fixedly connected to a rotating shaft (15), one end of the rotating shaft (15) extends toward the direction away from the mesh chamber (14) through the partition (16) into the heating chamber (5) and is rotatably connected to the heating chamber (5), the heating chamber (5) is provided with a heating plate (13) fixedly connected to the partition (16).

2. The traditional Chinese medicine residue treatment equipment according to claim 1, characterized in that: The processing chamber (3) has a feed inlet (18) at the top and a water outlet (6) at the bottom.

3. The equipment for treating Chinese herbal medicine residue according to claim 2, characterized in that: The feed inlet (18) is provided with a cover (19), and the top of the housing (29) is provided with a hinge (4). The top of the housing (29) and the cover (19) are hinged together by the hinge (4). The processing chamber (3) is provided with a support plate (22) which is fixed to the partition (16) and located above the mesh chamber (14). The cover (19) is pressed on the top of the support plate (22).

4. The equipment for treating Chinese herbal medicine residue according to claim 1, characterized in that: The outlet (6) of the treatment chamber (3) is configured as an inverted cone-shaped outlet.

5. The traditional Chinese medicine residue treatment equipment according to claim 4, characterized in that: The bottom of the housing (29) is fixed with a support leg (2).

6. The traditional Chinese medicine residue treatment equipment according to claim 4, characterized in that: The switching mechanism includes a first fixing block (25) fixed on the top of the mesh compartment (14) and a second fixing block (26) fixed on the top of the mesh cover (9). The first fixing block (25) and the second fixing block (26) are arranged opposite to each other. The second fixing block (26) has a socket (28) and the first fixing block (25) has a slot (23) corresponding to the socket (28). A spring (30) and a pin (27) are provided on the side wall of the second fixing block (26) away from the first fixing block (25). The pin (27) passes through the spring (30) and the socket (28) and extends into the slot (23). The two ends of the spring (30) are fixedly connected to the side wall of the second fixing block (26) away from the first fixing block (25) and the pin (27), respectively.

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