Feed distribution assembly for breeding cage

Abstract

The utility model relates to a feed distribution assembly for a breeding cage. The feed distribution assembly comprises a feed supply device, at least one feeding device and at least one group of feed distribution devices, the feeding device comprises a storage hopper and at least one discharge pipe; the feeding device comprises a moving mechanism and a first material distributing mechanism, the first material distributing mechanism is arranged on the moving mechanism, the first material distributing mechanism comprises a first material distributing hopper and a first blocking plate, and the first blocking plate is rotatably arranged at a discharging opening of the first material distributing hopper; the material distributing device comprises a sliding platform and a second material distributing mechanism, the second material distributing mechanism comprises a bearing frame, a second material distributing hopper, a second blocking plate and a linear driving assembly, the second material distributing hopper and the linear driving assembly are both arranged on the bearing frame, and the second blocking plate is connected to the linear driving assembly. Fodder is conveyed to the distributing devices through the feeding device, and then the distributing devices distribute the fodder to the breeding cages. Therefore, automatic feeding is achieved, manual participation is not needed, and the labor intensity of workers can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of animal breeding, in particular to a breeding cage feed distribution assembly. Background Art

[0002] Mice and rats are important experimental animals, and have a wide range of use value in many fields, such as life science exploration, disease treatment program demonstration, new drug development, infectious disease research, medical teaching and experiments, etc. Mice and rats used in modern biomedical research must be kept in a comfortable, stress-free and controlled barrier environment.

[0003] At present, in the process of raising mice, it is necessary to feed the feed to each breeding cage manually for the mice to eat. For large-scale breeding of mice, due to the large number of breeding cages, manual feeding of feed is not only inefficient, but also brings a heavy burden to the staff and increases the labor intensity. Utility Model Content

[0004] Based on the above description, the utility model provides a feed distribution assembly for a breeding cage, aiming to solve the problem that the existing artificial feeding of feed in breeding cages is time-consuming and labor-intensive.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A breeding cage feed distribution assembly, comprising:

[0007] A feeding device, comprising a storage hopper and at least one discharge pipe, wherein at least one discharge pipe is connected to a discharge port of the storage hopper;

[0008] At least one feeding device is arranged opposite to the feeding device, the feeding device comprises a moving mechanism and a first material dividing mechanism, the first material dividing mechanism is arranged on the moving mechanism, the moving mechanism is used to drive the first material dividing mechanism to move along a first direction, the first material dividing mechanism comprises a first material dividing hopper and a first blocking plate, the first blocking plate is rotatably arranged at the discharge port of the first material dividing hopper;

[0009] At least one group of material distribution devices is arranged opposite to the feeding device, the material distribution device includes a sliding platform and a second material distribution mechanism, the second material distribution mechanism is arranged on the sliding platform, the sliding platform is used to drive the second material distribution mechanism to move along the second direction, the second material distribution mechanism includes a supporting frame, a second material distribution hopper, a second sealing plate and a linear drive assembly, the second material distribution hopper and the linear drive assembly are both arranged on the supporting frame, the second sealing plate is arranged opposite to the discharge port of the second material distribution hopper, the second sealing plate is connected to the linear drive assembly, and the linear drive assembly is used to drive the second sealing plate to open or close the discharge port of the second material distribution hopper.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the feeding device includes a material control box, at least one rotating wheel and at least one first driving motor, the material control box is arranged between the storage hopper and at least one discharge pipe, the material control box is connected to the storage hopper, the material control box has at least one silo, the discharge pipe is connected to the silo, the rotating wheel is rotatably arranged in the silo, a plurality of troughs are opened on the rotating wheel, and the plurality of troughs are arranged at intervals along the circumference of the rotating wheel, and the output end of the first driving motor extends into the silo and is connected to the rotating wheel.

[0012] Furthermore, the feeding device includes a photoelectric sensor, and the photoelectric sensor is arranged on the storage hopper or the material control box.

[0013] Furthermore, the moving mechanism includes a back plate, a first driving assembly, a first sliding assembly and a connecting frame, the first driving assembly and the first sliding assembly are arranged on the back plate in parallel with each other, and the connecting frame is respectively connected to the first driving assembly and the first sliding assembly.

[0014] Furthermore, the first material distributing mechanism comprises a connecting seat and a weighing sensor, the connecting seat is arranged on a side of the first material distributing hopper close to the connecting frame, and the weighing sensor is respectively connected to the connecting frame and the connecting seat.

[0015] Furthermore, the first material distribution mechanism includes a main control module, and the weighing sensor is electrically connected to the main control module.

[0016] Furthermore, the first material distribution mechanism includes a limit plate, the limit plate is arranged on the first material distribution hopper, and the limit plate is arranged opposite to the first blocking plate.

[0017] Furthermore, the sliding platform includes a truss and a second driving assembly, and the second driving assembly is arranged on the truss.

[0018] Furthermore, the second material distribution mechanism includes at least one pair of second sliding assemblies, each pair of the second sliding assemblies is axisymmetric about the central axis of the linear drive assembly, and the linear drive assembly is connected to each of the second sliding assemblies.

[0019] Furthermore, the second material distribution mechanism includes two third sliding assemblies, the two third sliding assemblies are symmetrically arranged, and the third sliding assemblies include a side plate and a plurality of rollers, and all the rollers are rotatably arranged on the side plate.

[0020] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0021] (1) The present application uses a feeding device to transport feed to each distribution device, and then the distribution device distributes the feed to each breeding cage, thereby realizing automatic feeding without manual intervention, which can reduce the labor intensity of the staff.

[0022] (2) The photoelectric sensor of the present application plays the role of in-place detection, which facilitates the first feed hopper to align with the discharge pipe and prevents the feed from being scattered on the ground.

[0023] (3) The limiting plate of the present application serves to limit the first blocking plate, thereby preventing the first blocking plate from over-rotating and preventing the first blocking plate from colliding with the first material distribution hopper. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a general assembly diagram of a breeding cage feed distribution assembly provided in an embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the feeding device in the embodiment of the utility model;

[0026] Figure 3 It is a cross-sectional view of the feeding device in the embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the feeding device in the embodiment of the utility model;

[0028] Figure 5 for Figure 4 A partial enlarged view of the middle part;

[0029] Figure 6 for Figure 4 A partial enlarged view of point B in the middle;

[0030] Figure 7 This is a schematic diagram of the structure of the material distribution device in the embodiment of the utility model;

[0031] Figure 8 This is a schematic diagram of the structure of the sliding platform in the embodiment of the utility model;

[0032] Fig. 9 It is a structural schematic diagram of the second material distributing mechanism in an embodiment of the utility model.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 10. Feeding device; 11. Storage hopper; 12. Discharge pipe; 13. Material control box; 131. Material bin; 14. Rotating wheel; 141. Material trough; 15. First driving motor; 16. Photoelectric sensor;

[0035] 20. Feeding device; 21. Moving mechanism; 211. Back plate; 212. First driving assembly; 2121. Second driving motor; 2122. Transmission unit; 2123. Connecting unit; 213. First sliding assembly; 214. Connecting frame; 22. First material distributing mechanism; 221. First material distributing hopper; 222. First blocking plate; 223. Connecting seat; 224. Weighing sensor; 225. Main control module; 226. Limiting plate;

[0036] 30. Material distribution device; 31. Sliding platform; 311. Truss; 312. Second driving assembly; 32. Second material distribution mechanism; 321. Carrying frame; 322. Second material distribution hopper; 323. Second blocking plate; 324. Linear driving assembly; 3241. Third driving motor; 3242. Screw rod; 3243. Nut seat; 325. Second sliding assembly; 326. Third sliding assembly; 3261. Side plate; 3262. Roller. DETAILED DESCRIPTION

[0037] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0040] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0041] Refer to the attached Figures 1 to 9 As shown, the utility model provides a technical solution: a breeding cage feed distribution assembly, comprising a feeding device 10, at least one feeding device 20 and at least one group of feeding devices 30; the feeding device 10 comprises a storage hopper 11 and at least one discharge pipe 12, at least one discharge pipe 12 is connected to the discharge port of the storage hopper 11; at least one feeding device 20 is arranged opposite to the feeding device 10, the feeding device 20 comprises a moving mechanism 21 and a first dividing mechanism 22, the first dividing mechanism 22 is arranged on the moving mechanism 21, the moving mechanism 21 is used to drive the first dividing mechanism 22 to move along a first direction, the first dividing mechanism 22 comprises a first dividing hopper 221 and a first blocking plate 222, the first blocking plate 222 is rotatably arranged at the discharge port of the first dividing hopper 221; to The least-component material distribution device 30 is arranged opposite to the feeding device 20, and the material distribution device 30 includes a sliding platform 31 and a second material distribution mechanism 32. The second material distribution mechanism 32 is arranged on the sliding platform 31, and the sliding platform 31 is used to drive the second material distribution mechanism 32 to move along the second direction. The second material distribution mechanism 32 includes a supporting frame 321, a second material distribution hopper 322, a second sealing plate 323 and a linear drive assembly 324. The second material distribution hopper 322 and the linear drive assembly 324 are both arranged on the supporting frame 321, and the second sealing plate 323 is arranged opposite to the discharge port of the second material distribution hopper 322. The second sealing plate 323 is connected to the linear drive assembly 324, and the linear drive assembly 324 is used to drive the second sealing plate 323 to open or close the discharge port of the second material distribution hopper 322.

[0042] Exemplarily, the discharge pipe 12 may be square or circular, etc. The number of each group of discharging devices 30 may be two or more. A swivel seat may be provided on the inclined surface of the first discharging hopper 221 located at the discharge port, a rotating shaft may be provided on the first sealing plate 222, the rotating shaft may be rotatably connected to the swivel seat, and a torsion spring may be provided between the rotating shaft and the swivel seat. The linear drive assembly 324 may be an electric push rod, an electric cylinder, a cylinder or a hydraulic cylinder, etc. Alternatively, the linear drive assembly 324 may include a third drive motor 3241, a screw rod 3242 or a nut seat 3243, etc., one end of the screw rod 3242 is connected to the output end of the third drive motor 3241, the nut seat 3243 is threadedly matched with the screw rod 3242, and the second sealing plate 323 is connected to the nut seat 3243.

[0043] According to this embodiment, the moving mechanism 21 moves the first sub-hopper 221 to correspond to the discharge pipe 12. Then pour the feed into the storage hopper 11, so that the feed falls into the first sub-hopper 221 through the discharge pipe 12. When the first sub-hopper 221 is full of feed, the moving mechanism 21 moves the first sub-hopper 221 to the corresponding distribution device 30. The sliding platform 31 moves the second sub-hopper 322 to the first sub-hopper 221, and at the same time, the second sub-hopper 322 pushes the first blocking plate 222 to rotate, and the first blocking plate 222 opens the discharge port of the first sub-hopper 221. When the second sub-hopper 322 corresponds to the discharge port of the first sub-hopper 221, the second sub-hopper 322 stops moving to receive the feed. When the second sub-hopper 322 is full, the sliding platform 31 moves the second sub-hopper 322 to each breeding cage, and makes the discharge port of the second sub-hopper 322 correspond to the feed bin 131 of the breeding cage. Subsequently, the linear drive assembly 324 drives the second blocking plate 323 to move, so that the second blocking plate 323 opens the discharge port of the second feed hopper 322, thereby feeding the feed bin 131 of the breeding cage.

[0044] Refer to the attached Figures 1 to 3 As shown, in some embodiments, the feeding device 10 includes a material control box 13, at least one rotating wheel 14 and at least one first driving motor 15. The material control box 13 is arranged between the storage hopper 11 and at least one discharge pipe 12. The material control box 13 is connected to the storage hopper 11. The material control box 13 has at least one material bin 131. The discharge pipe 12 is connected to the material bin 131. The rotating wheel 14 is rotatably arranged in the material bin 131. A plurality of material troughs 141 are opened on the rotating wheel 14. The plurality of material troughs 141 are arranged at intervals along the circumference of the rotating wheel 14. The output end of the first driving motor 15 extends into the material bin 131 and is connected to the rotating wheel 14.

[0045] Exemplarily, when there are two or more discharge pipes 12 , silos 131 , rotating wheels 14 and first drive motors 15 , the discharge pipes 12 , rotating wheels 14 and first drive motors 15 correspond to the silos 131 one by one.

[0046] According to this embodiment, the feed is stored in the storage hopper 11 in advance. When feeding is required, the first drive motor 15 drives the wheel 14 to rotate, and the feed falls into the discharge pipe 12 through the feed trough 141, and then falls into the first sub-hopper 221 from the discharge pipe 12. In this way, automated operation can be achieved and the labor intensity of the staff can be reduced.

[0047] Refer to the attached Figures 1 to 3 As shown, in some embodiments, the feeding device 10 includes a photoelectric sensor 16 , and the photoelectric sensor 16 is disposed on the storage hopper 11 or the material control box 13 .

[0048] According to this embodiment, the photoelectric sensor 16 plays a role in detecting the position, which facilitates the first sub-hopper 221 to align with the discharge pipe 12 and prevents the feed from being scattered on the ground.

[0049] See attached Figure 1 and 4 As shown in Figures 5 and 6, in some embodiments, the moving mechanism 21 includes a back plate 211, a first driving assembly 212, a first sliding assembly 213 and a connecting frame 214. The first driving assembly 212 and the first sliding assembly 213 are arranged on the back plate 211 in parallel with each other, and the connecting frame 214 is connected to the first driving assembly 212 and the first sliding assembly 213 respectively.

[0050] Exemplarily, the first driving assembly 212 may include a second driving motor 2121, two transmission parts 2122 and a connecting part 2123, wherein one transmission part 2122 is sleeved on the output end of the second driving motor 2121, the two transmission parts 2122 are spaced apart along the first direction, the two transmission parts 2122 are connected by the connecting part 2123, and the connecting frame 214 is connected to the connecting part 2123. The transmission part 2122 may be a synchronous wheel or a gear, etc., and the connecting part 2123 may be a synchronous toothed belt or a chain, etc.; when the transmission part 2122 is a synchronous wheel, the connecting part 2123 is a synchronous toothed belt; when the transmission part 2122 is a gear, the connecting part 2123 is a chain. Alternatively, the first drive assembly 212 may include a third drive motor 3241, a screw rod 3242 or a nut seat 3243, etc., one end of the screw rod 3242 is connected to the output end of the third drive motor 3241, the nut seat 3243 is threadedly matched with the screw rod 3242, and the connecting frame 214 is connected to the nut seat 3243. The first sliding assembly 213 may include a guide rail and a slider, the slider is slidably matched with the guide rail, and the connecting frame 214 is connected to the slider. Alternatively, the first sliding assembly 213 may include an optical axis and a linear bearing, the linear bearing is slidably matched with the optical axis, and the connecting frame 214 is connected to the linear bearing.

[0051] According to this embodiment, the first driving assembly 212 drives the connecting frame 214 to move along the first direction via the first sliding assembly 213 , so that the first material distribution hopper 221 can be transported to each material distribution device 30 .

[0052] See attached Figure 5 As shown, in some embodiments, the first material distribution mechanism 22 includes a connecting seat 223 and a weighing sensor 224. The connecting seat 223 is arranged on a side of the first material distribution hopper 221 close to the connecting frame 214, and the weighing sensor 224 is respectively connected to the connecting frame 214 and the connecting seat 223.

[0053] According to this embodiment, the weighing sensor 224 measures the weight of the first sub-hopper 221. When the first sub-hopper 221 is charged, it can be monitored whether the first sub-hopper 221 is full of feed. When the first sub-hopper 221 is discharged, it can be monitored whether the first sub-hopper 221 has completed discharging.

[0054] Refer to the attached Figure 5 As shown, in some embodiments, the first material distribution mechanism 22 includes a main control module 225 , and the weighing sensor 224 is electrically connected to the main control module 225 .

[0055] Exemplarily, the main control module 225 may be a single chip microcomputer of the stm32 series or the like.

[0056] According to this embodiment, the main control module 225 is mainly used to receive the electrical signal sent back by the weighing sensor 224, calculate the first material distribution hopper 221, and feed back the first material distribution hopper 221 to the master control device to facilitate the next step.

[0057] Refer to the attached Figure 5 As shown, in some embodiments, the first material distribution mechanism 22 includes a limit plate 226 , which is disposed on the first material distribution hopper 221 , and the limit plate 226 is disposed opposite to the first blocking plate 222 .

[0058] According to this embodiment, when the first blocking plate 222 is opened, the limiting plate 226 limits the first blocking plate 222 to avoid excessive rotation of the first blocking plate 222 and to prevent the first blocking plate 222 from colliding with the first sub-hopper 221 .

[0059] Refer to the attached Figure 1 and 7 As shown, in some embodiments, the sliding platform 31 includes a truss 311 and a second driving assembly 312 , and the second driving assembly 312 is disposed on the truss 311 .

[0060] For example, the second driving assembly 312 may have the same structure as the first driving assembly 212 .

[0061] According to this embodiment, the second driving assembly 312 drives the second material distribution mechanism 32 to move to each breeding cage, so that the second material distribution mechanism 32 feeds each breeding cage.

[0062] Refer to the attached Figures 7 to 9 As shown, in some embodiments, the second material dividing mechanism 32 includes at least one pair of second sliding assemblies 325 , each pair of second sliding assemblies 325 is axially symmetrical about the central axis of the linear drive assembly 324 , and the linear drive assembly 324 is connected to each second sliding assembly 325 .

[0063] Exemplarily, the second sliding assembly 325 may include a guide rail and a slider, and the slider and the guide rail are slidably matched. Alternatively, the second sliding assembly 325 may include an optical axis and a linear bearing, and the linear bearing and the optical axis are slidably matched.

[0064] According to this embodiment, the second sliding assembly 325 can keep the second blocking plate 323 moving linearly, thereby ensuring the stability of the second blocking plate 323 and preventing the feed from leaking out.

[0065] Refer to the attached Figures 8-9 As shown, in some embodiments, the second material dividing mechanism 32 includes two third sliding assemblies 326 , which are symmetrically arranged. The third sliding assembly 326 includes a side plate 3261 and a plurality of rollers 3262 , and all the rollers 3262 are rotatably arranged on the side plate 3261 .

[0066] According to this embodiment, the support frame 321 can maintain linear movement, thereby ensuring the stability of the support frame 321.

[0067] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A breeding cage feed distribution assembly, characterized in that: include: A feeding device (10) comprises a storage hopper (11) and at least one discharge pipe (12), wherein at least one discharge pipe (12) is connected to a discharge port of the storage hopper (11); At least one feeding device (20) is arranged opposite to the feeding device (10), the feeding device (20) comprising a moving mechanism (21) and a first material dividing mechanism (22), the first material dividing mechanism (22) being arranged on the moving mechanism (21), the moving mechanism (21) being used to drive the first material dividing mechanism (22) to move along a first direction, the first material dividing mechanism (22) comprising a first material dividing hopper (221) and a first blocking plate (222), the first blocking plate (222) being rotatably arranged at a discharge port of the first material dividing hopper (221); At least one group of material distribution devices (30) is arranged opposite to the feeding device (20), the material distribution device (30) comprises a sliding platform (31) and a second material distribution mechanism (32), the second material distribution mechanism (32) is arranged on the sliding platform (31), the sliding platform (31) is used to drive the second material distribution mechanism (32) to move along a second direction, the second material distribution mechanism (32) comprises a carrier frame (321), a second material distribution hopper (322), a second blocking plate (323) and a linear The driving assembly (324), the second material distribution hopper (322) and the linear driving assembly (324) are all arranged on the supporting frame (321), the second sealing plate (323) is arranged opposite to the discharge port of the second material distribution hopper (322), the second sealing plate (323) is connected to the linear driving assembly (324), and the linear driving assembly (324) is used to drive the second sealing plate (323) to open or close the discharge port of the second material distribution hopper (322).

2. The breeding cage feed distribution assembly according to claim 1, characterized in that: The feeding device (10) comprises a material control box (13), at least one rotating wheel (14) and at least one first driving motor (15); the material control box (13) is arranged between the storage hopper (11) and at least one discharge pipe (12); the material control box (13) is connected to the storage hopper (11); the material control box (13) has at least one material bin (131); the discharge pipe (12) is connected to the material bin (131); the rotating wheel (14) is rotatably arranged in the material bin (131); a plurality of material troughs (141) are provided on the rotating wheel (14); the plurality of material troughs (141) are arranged at intervals along the circumference of the rotating wheel (14); the output end of the first driving motor (15) extends into the material bin (131) and is connected to the rotating wheel (14).

3. The breeding cage feed distribution assembly according to claim 2, characterized in that: The feeding device (10) comprises a photoelectric sensor (16), and the photoelectric sensor (16) is arranged on the storage hopper (11) or the material control box (13).

4. The breeding cage feed distribution assembly according to claim 1, characterized in that: The moving mechanism (21) comprises a back plate (211), a first driving assembly (212), a first sliding assembly (213) and a connecting frame (214); the first driving assembly (212) and the first sliding assembly (213) are arranged on the back plate (211) in parallel with each other; and the connecting frame (214) is respectively connected to the first driving assembly (212) and the first sliding assembly (213).

5. The breeding cage feed distribution assembly according to claim 4, characterized in that: The first material distribution mechanism (22) comprises a connecting seat (223) and a weighing sensor (224); the connecting seat (223) is arranged on a side of the first material distribution hopper (221) close to the connecting frame (214); and the weighing sensor (224) is respectively connected to the connecting frame (214) and the connecting seat (223).

6. The breeding cage feed distribution assembly according to claim 5, characterized in that: The first material distribution mechanism (22) comprises a main control module (225), and the weighing sensor (224) is electrically connected to the main control module (225).

7. The breeding cage feed distribution assembly according to claim 6, characterized in that: The first material distribution mechanism (22) comprises a limit plate (226), the limit plate (226) is arranged on the first material distribution hopper (221), and the limit plate (226) is arranged opposite to the first blocking plate (222).

8. The breeding cage feed distribution assembly according to any one of claims 1 to 7, characterized in that: The sliding platform (31) comprises a truss (311) and a second driving assembly (312), wherein the second driving assembly (312) is arranged on the truss (311).

9. The breeding cage feed distribution assembly according to claim 8, characterized in that: The second material distribution mechanism (32) includes at least one pair of second sliding assemblies (325), each pair of the second sliding assemblies (325) is symmetrical about the central axis of the linear drive assembly (324), and the linear drive assembly (324) is connected to each of the second sliding assemblies (325).

10. The breeding cage feed distribution assembly according to claim 9, characterized in that: The second material distribution mechanism (32) comprises two third sliding assemblies (326), the two third sliding assemblies (326) are symmetrically arranged, the third sliding assemblies (326) comprise a side plate (3261) and a plurality of rollers (3262), and all the rollers (3262) are rotatably arranged on the side plate (3261).

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