Cleaning device for saggar and saggar conveying equipment

Abstract

The utility model provides a sagger cleaning device and sagger conveying equipment. The cleaning device for the saggar comprises a protective cover, an ultrasonic machine and a dust suction cover, a through cavity is formed in the protective cover, and an outer circulation conveying line penetrates through the through cavity and is used for conveying the saggar; the ultrasonic machine is arranged on the shield, and the ultrasonic transmitting end of the ultrasonic machine is located in the through cavity; the dust hood is located at the bottom of the outer circulation conveying line, the dust collection end of the dust hood communicates with the through cavity, and a dust collection outlet is formed in the end, away from the protective cover, of the dust hood. When the sagger passes through the through cavity, materials on the outer side of the sagger are removed and collected through cooperation of the ultrasonic machine and the dust suction hood, the cleaning mode that a brush or an air knife type cleaning mechanism is adopted in the prior art is omitted, foreign matter brought to the outer side of the sagger by the cleaning mechanism is avoided, and the problem that the foreign matter is introduced in the cleaning process is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion battery positive electrode material manufacturing equipment, and in particular to a sagger cleaning device and sagger transmission equipment. Background Art

[0002] Nowadays, ternary materials generally use high-temperature sintering method for precursor and lithium salt reaction. Due to the particularity of high-temperature sintering, it is necessary to use a high-temperature resistant sagger carrier for loading and then entering the furnace for high-temperature sintering reaction. During the sintering process of the material, the sagger is used as a recycling device, which circulates on the external circulation conveyor line. In each process before and after sintering, the positive electrode material powder inside the sagger will escape and adhere to the outside of the sagger. If the attached material is not cleaned in time, it will be re-sintered in the furnace, and the process of unloading the sagger out of the furnace will be transferred to the normal production line material, polluting the product; and the circulation of the sagger is mainly achieved by the friction between the external circulation conveyor line. The friction between the two generates metal dust foreign matter. In addition, the operation process of the external circulation conveyor line itself will also generate metal dust foreign matter. These metal foreign matter is attached to the sagger. As the sagger circulates on the external circulation conveyor line, it will be mixed into the positive electrode material, causing the metal foreign matter to exceed the standard, and ultimately affecting the safety performance of the battery.

[0003] To this end, the Chinese patent with patent number CN 216026915 U proposes a device for cleaning the outside of the sagger, which uses the bristle surface of the first brush member and the bristle surface of the second brush member to clean the outside of the sagger, and at the same time cooperates with the magnetic suction effect of the magnetic brush group to adsorb and clean the metal magnetic foreign matter at the bottom of the sagger, so as to reduce the material attached to the outside of the sagger and prevent the metal magnetic foreign matter from entering the normal material of the production line.

[0004] The technical solution of the above patent can effectively clean the materials outside the sagger and prevent metal magnetic foreign matter from mixing into the materials on the production line. However, the technical solution also has the following problems:

[0005] When a cleaning mechanism with a brush or air knife cleans the outside of the sagger, this type of cleaning method with medium contact can easily cause the bristles or other foreign matter in the cleaning mechanism to adhere to the outside of the sagger, which can easily cause the risk of introducing foreign matter generated by the cleaning mechanism into normal materials. Utility Model Content

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a sagger cleaning device and sagger transmission equipment that can remove and collect materials on the outside of the sagger by cooperating with an ultrasonic machine and a dust hood, thereby eliminating the cleaning method of the prior art using a brush or air knife type cleaning mechanism, and avoiding the risk of the cleaning mechanism generating foreign matter on the outside of the sagger.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A cleaning device for saggers comprises a protective cover, an ultrasonic machine and a dust hood, wherein the protective cover is formed with a through cavity, an external circulation conveying line is passed through the through cavity, and the external circulation conveying line is used to convey the saggers; the ultrasonic machine is arranged on the protective cover, and an ultrasonic transmitting end of the ultrasonic machine is located in the through cavity; the dust hood is located at the bottom of the external circulation conveying line, a dust collecting end of the dust hood is communicated with the through cavity, and a dust collecting outlet is formed at one end of the dust hood away from the protective cover.

[0009] In one embodiment, the ultrasonic machine includes an ultrasonic generator and an ultrasonic transducer, the ultrasonic transducer is arranged on the outside of the protective cover, the ultrasonic generator is arranged on the protective cover, and the output end of the ultrasonic generator is connected to the through cavity, and the ultrasonic generator is electrically connected to the ultrasonic transducer.

[0010] In one of the embodiments, the dust hood includes a hood body and a negative pressure fan, the inner cavity of the hood body is connected to the through cavity, the negative pressure fan is arranged on the hood body, and the negative pressure fan is arranged adjacent to the dust collection outlet.

[0011] In one embodiment, the cover body is an inverted trapezoidal structure; and / or the shield is provided with an observation window.

[0012] In one embodiment, the cleaning device for the sagger also includes a lifting mechanism, which includes a bracket and a lifting assembly, the bracket is fixedly connected to the bottom of the external circulation conveyor line, the bracket is provided with the dust hood and the lifting assembly, the lifting assembly is passed through the external circulation conveyor line, and the top end of the lifting assembly is movably supported on the bottom of the sagger, and the lifting assembly raises or lowers the height of the sagger to enable the sagger to detach from or enter the external circulation conveyor line.

[0013] In one of the embodiments, the sagger cleaning device further comprises an infrared sensor, and the infrared sensor is disposed on the outer circulation conveying line, and the infrared sensor is disposed corresponding to the lifting assembly.

[0014] In one embodiment, the lifting assembly includes two bases and two telescopic cylinders, each of the bases is inserted into the external circulation conveyor line, and each of the bases is fixed to the top of the bracket, and the two bases are respectively located on both sides of the sagger, the two bases and the two telescopic cylinders are arranged in a one-to-one correspondence, each of the telescopic cylinders is arranged at the corresponding base, and the side walls of each telescopic cylinder are provided with clamping members, the two clamping members are arranged flush with each other, and the two clamping members are both located at the bottom of the sagger, so that the two clamping members are used to clamp the sagger together.

[0015] In one embodiment, each of the telescopic cylinders is provided with a telescopic guide column; and / or the clamping member is a clamping cylinder.

[0016] A sagger transmission device comprises an external circulation conveying line and a sagger cleaning device as described in any one of the above embodiments, wherein the external circulation conveying line is arranged through the through cavity to transport the sagger.

[0017] In one embodiment, the external circulation conveyor line includes a frame, a driving motor, a chain, multiple transmission gear sets and multiple conveying wheel sets. The frame is penetrated through the through cavity, the protective cover is arranged at the bottom of the frame, the power output end of the driving motor is connected to one of the transmission gear sets, and the multiple conveying wheel sets are rotatably connected to the frame. Each of the conveying wheel sets is provided with at least one transmission gear set, and the chain is respectively mounted on the transmission gear sets corresponding to the multiple conveying wheel sets.

[0018] Compared with the prior art, the present invention has the following advantages, including but not limited to:

[0019] 1. Through the cooperation of ultrasonic machine and dust hood, the materials on the outside of the sagger are cleared and collected, eliminating the cleaning method of brush or air knife cleaning mechanism in the prior art, avoiding the cleaning mechanism from bringing foreign matter to the outside of the sagger, and preventing the problem of foreign matter being introduced during the cleaning process;

[0020] 2. No human intervention during the entire operation, reducing human resource investment and alleviating the workload of operators;

[0021] 3. Compared with the cleaning mechanism in the prior art, the operation of the sagger cleaning device of the present application is simpler and easier to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the structure of a cleaning device for saggers in one embodiment;

[0024] Figure 2 It is a structural schematic diagram of a cleaning device for sagger in another embodiment;

[0025] Figure 3 for Figure 1 A schematic diagram of the structure of the lifting assembly in the sagger cleaning device shown;

[0026] Figure 4 for Figure 1 A schematic diagram of the structure of a dust hood in a sagger cleaning device is shown;

[0027] Figure 5 It is a structural schematic diagram of the telescopic cylinder;

[0028] Figure 6 This is a physical picture of the protective cover and the external circulation conveyor line;

[0029] Figure 7 Another physical picture of the protective cover and the external circulation conveyor line;

[0030] Figure 8 This is a physical picture of the frame and conveying wheel set in the external circulation conveyor line;

[0031] Description of reference numerals:

[0032] A cleaning device 10 for a sagger, an external circulation conveyor line 20, a frame 21, a driving motor 22, a chain 23, a transmission gear set 24, a conveying wheel set 25, and a sagger 30; a protective cover 100, an observation window 110, and a through cavity 101; an ultrasonic machine 200, an ultrasonic generator 210, and an ultrasonic transducer 220; a dust hood 300, a hood body 310, and a negative pressure fan 320; a lifting mechanism 400, a bracket 410, an anchor bolt 412, a lifting assembly 420, a base 422, a telescopic cylinder 424, a telescopic guide column 424a, an air inlet 4241, an air outlet 4242, a first piston cavity 4243, a second piston cavity 4244, a clamping member 426, and an air guide pipe 428. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure 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 disclosure more thoroughly and comprehensively understood.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0037] See also Figures 1 to 4 , which is a sagger cleaning device 10 according to an embodiment of the present disclosure, comprising a protective cover 100, an ultrasonic machine 200 and a dust hood 300, wherein the protective cover 100 is formed with a through cavity 101, and an external circulation conveying line 20 is arranged through the through cavity 101, and the external circulation conveying line 20 is used to convey the sagger 30; the ultrasonic machine 200 is arranged on the protective cover 100, and an ultrasonic transmitting end of the ultrasonic machine 200 is located in the through cavity 101; the dust hood 300 is located at the bottom of the external circulation conveying line 20, and a dust collecting end of the dust hood 300 is communicated with the through cavity 101, and a dust collecting outlet 301 is formed at one end of the dust hood 300 away from the protective cover 100.

[0038] In the present embodiment, the protective cover 100 is formed with a through cavity 101, and the external circulation conveying line 20 is arranged through the through cavity 101. When the external circulation conveying line 20 is used to convey the sagger 30, the sagger 30 will pass through the protective cover 100. When the sagger 30 passes through the through cavity 101, the residual material on the outside of the sagger 30 is removed by the ultrasonic vibration of the ultrasonic machine 200. Since the dust collection end of the dust hood 300 is connected to the through cavity 101, the dust hood 300 collects the material removed from the outside of the sagger 30, and then discharges the collected material through the dust collection outlet 301. It should be pointed out that the ultrasonic transmitting end of the ultrasonic machine emits ultrasonic waves, and the material is removed from the outside of the sagger 30 by the vibration of the ultrasonic wave.

[0039] In the present embodiment, the materials on the outside of the sagger 30 are cleared and collected by the cooperation of the ultrasonic machine 200 and the dust hood 300, thereby eliminating the cleaning method of the prior art using a brush or air knife type cleaning mechanism, avoiding the cleaning mechanism from bringing foreign matter to the outside of the sagger 30, and preventing the problem of foreign matter being introduced during the cleaning process; there is no manual participation in the entire operation, reducing the investment in human resources and alleviating the workload of the operator; compared with the cleaning mechanism in the prior art, the sagger cleaning device 10 of the present application is simpler to operate and easier to use.

[0040] In one embodiment, see Figure 1The ultrasonic machine 200 includes an ultrasonic generator 210 and an ultrasonic transducer 220. The ultrasonic transducer 220 is disposed on the outside of the shield 100. The ultrasonic generator 210 is disposed on the shield 100, and the output end of the ultrasonic generator 210 is communicated with the through cavity 101. The ultrasonic generator 210 is electrically connected to the ultrasonic transducer 220. In this way, the ultrasonic generator 210 and the ultrasonic transducer 220 work simultaneously to remove the materials outside the sagger 30. By setting the ICP value of the ultrasonic transducer 220 and adjusting the amplitude, a better cleaning effect can be achieved according to the material adhesion condition outside the sagger 30.

[0041] In one embodiment, see Figure 4 The dust hood 300 includes a hood body 310 and a negative pressure fan 320. The inner cavity of the hood body 310 is connected to the through cavity 101. The negative pressure fan 320 is disposed in the hood body 310 and is disposed adjacent to the dust collecting outlet 301. In this embodiment, the negative pressure fan 320 collects the materials removed from the outside of the sagger 30 into the hood body 310.

[0042] In one embodiment, see Figure 4 The cover body 310 is an inverted trapezoidal structure, so as to better receive the materials dropped after the outside of the sagger 30 is cleaned.

[0043] In one embodiment, see Figure 2 The protective cover 100 is provided with an observation window 110. In this way, it is convenient to observe the progress of the cleaning work of the sagger 30 in the protective cover 100.

[0044] In one embodiment, see Figure 2The sagger cleaning device 10 also includes a lifting mechanism 400, which includes a bracket 410 and a lifting assembly 420. The bracket 410 is fixedly connected to the bottom of the outer circulation conveyor line 20. The bracket 410 is provided with the dust hood 300 and the lifting assembly 420. The lifting assembly 420 is penetrated by the outer circulation conveyor line 20, and the top end of the lifting assembly 420 is movably supported on the bottom of the sagger 30. The lifting assembly 420 raises or lowers the height of the sagger 30 to make the sagger 30 separate from or enter the outer circulation conveyor line 20. In the present embodiment, the lifting mechanism 400 includes a bracket 410 and a lifting assembly 420, and the dust hood 300 and the lifting assembly 420 are installed by the bracket 410, wherein the lifting assembly 420 is arranged in the outer circulation conveying line 20, and the top end of the lifting assembly 420 is movably supported at the bottom of the sagger 30; it can be understood that when the material outside the sagger 30 is cleaned, since the top end of the lifting assembly 420 is movably supported at the bottom of the sagger 30, the height of the sagger 30 is raised by the lifting assembly 420, and the sagger 30 is separated from the outer circulation conveying line 20. At this time, the outer side of the sagger 30 can be cleaned, and the outer circulation conveying line 20 is also convenient for the outer circulation conveying line 20 to transport the cleaned sagger 30, avoiding interference between the cleaning and conveying work of multiple saggers 30, and improving work efficiency; when the sagger 30 completes the cleaning operation, the height of the sagger 30 is lowered by the lifting assembly 420, so that the sagger 30 enters the outer circulation conveying line 20, and the cleaned sagger 30 is transported by the outer circulation conveying line 20.

[0045] In one embodiment, the sagger cleaning device further comprises an infrared sensor, which is arranged on the outer circulation conveying line, and the infrared sensor is arranged corresponding to the lifting assembly. Thus, the sagger is conveyed to the through cavity by the infrared sensor, the lifting assembly is used to raise the height of the sagger, and then the ultrasonic machine is used to clean the sagger.

[0046] In one embodiment, see Figure 3 and Figure 5The lifting assembly 420 includes two bases 422 and two telescopic cylinders 424, each of the bases 422 is penetrated by the outer circulation conveying line 20, and each of the bases 422 is fixed to the top of the bracket 410, and the two bases 422 are respectively located on both sides of the sagger 30, the two bases 422 and the two telescopic cylinders 424 are arranged in a one-to-one correspondence, each of the telescopic cylinders 424 is arranged at the corresponding base 422, and the side walls of each of the telescopic cylinders 424 are provided with clamping members 426, the two clamping members 426 are arranged in a corresponding flush manner, and the two clamping members 426 are both located at the bottom of the sagger 30, so that the two clamping members 426 are used to clamp the sagger 30 together. In this embodiment, since the side walls of each telescopic cylinder 424 are provided with a clamping member 426 , the two clamping members 426 clamp the sagger 30 together. Through the telescopic movement of the two telescopic cylinders 424 , the two clamping members 426 clamp the sagger 30 to separate from or enter the external circulation conveyor line 20 .

[0047] For further information, see Figure 3 and Figure 5 The lifting assembly 420 also includes four air guide tubes 428. Each telescopic cylinder 424 is respectively formed with an air inlet 4241 and an air outlet 4242. A first piston chamber 4243 and a second piston chamber 4244 are respectively formed on both sides of the piston of each telescopic cylinder 424. The air inlet 4241 of each telescopic cylinder 424 is connected to the corresponding first piston chamber 4243 through one of the air guide tubes 428, and the air outlet 4242 of each telescopic cylinder 424 is connected to the corresponding second piston chamber 4244 through another air guide tube 428.

[0048] In one embodiment, see Figure 2 The bottom end of the bracket 410 is provided with an anchor bolt 412. In this way, the bracket 410 can be firmly installed and fixed on the ground.

[0049] In one embodiment, see Figure 3 A telescopic guide post 424a is provided in each of the telescopic cylinders 424. In this way, the telescopic guide post 424a is used to provide a guiding effect for the telescopic movement of the telescopic cylinder 424.

[0050] In one embodiment, the clamping member is a clamping cylinder.

[0051] The present disclosure further provides a sagger transmission device, comprising an external circulation conveying line and a sagger cleaning device as described in any of the above embodiments, wherein the external circulation conveying line passes through the through cavity to transport the sagger.

[0052] In one embodiment, see Figures 1 to 8, the outer circulation conveyor line 20 includes a frame 21, a driving motor 22, a chain 23, a plurality of transmission gear sets 24 and a plurality of conveying wheel sets 25, the frame 21 is arranged in the through cavity 101, the shield 100 is arranged at the bottom of the frame 21, the power output end of the driving motor 22 is connected to one of the transmission gear sets 24, and the plurality of conveying wheel sets 25 are all rotatably connected to the frame 21, each of the conveying wheel sets 25 is provided with at least one transmission gear set 24, and the chain 23 is respectively sleeved on the transmission gear sets 24 corresponding to the plurality of conveying wheel sets 25. In the present embodiment, the driving motor 22 drives the transmission gear set 24 to rotate, and since the chain 23 is respectively sleeved on the transmission gear sets 24 corresponding to the plurality of conveying wheel sets 25, the plurality of conveying wheel sets 25 are all rotatably connected to the frame 21, and the sagger 30 is transported through the plurality of conveying wheel sets 25.

[0053] Compared with the prior art, the present invention has the following advantages, including but not limited to:

[0054] 1. The materials on the outside of the sagger 30 are cleaned and collected by the cooperation of the ultrasonic machine 200 and the dust hood 300, eliminating the cleaning method of the prior art using a brush or air knife cleaning mechanism, avoiding the cleaning mechanism from bringing foreign matter to the outside of the sagger 30, and preventing the problem of foreign matter being introduced during the cleaning process;

[0055] 2. No human intervention during the entire operation, reducing human resource investment and alleviating the workload of operators;

[0056] 3. Compared with the cleaning mechanism in the prior art, the operation of the sagger cleaning device 10 of the present application is simpler and easier to use.

[0057] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A cleaning device for sagger, characterized in that: include: A protective cover (100), wherein the protective cover (100) is formed with a through cavity (101), an external circulation conveying line (20) is arranged through the through cavity (101), and the external circulation conveying line (20) is used to convey the sagger (30); An ultrasonic machine (200) is arranged on the protective cover (100), and an ultrasonic wave transmitting end of the ultrasonic machine (200) is located in the through cavity (101); A dust collection hood (300) is located at the bottom of the external circulation conveying line (20); a dust collection end of the dust collection hood (300) is in communication with the through cavity (101); and a dust collection outlet (301) is formed at one end of the dust collection hood (300) away from the protective cover (100).

2. The cleaning device for sagger according to claim 1, characterized in that: The ultrasonic machine (200) comprises an ultrasonic generator (210) and an ultrasonic transducer (220); the ultrasonic transducer (220) is arranged outside the protective cover (100); the ultrasonic generator (210) is arranged on the protective cover (100); an output end of the ultrasonic generator (210) is in communication with the through cavity (101); and the ultrasonic generator (210) is electrically connected to the ultrasonic transducer (220).

3. The cleaning device for sagger according to claim 1, characterized in that: The dust collection hood (300) comprises a hood body (310) and a negative pressure fan (320); the inner cavity of the hood body (310) is in communication with the through cavity (101); the negative pressure fan (320) is disposed on the hood body (310), and the negative pressure fan (320) is disposed adjacent to the dust collection outlet (301).

4. The cleaning device for sagger according to claim 3, characterized in that: The cover body (310) is an inverted trapezoidal structure; and / or the protective cover (100) is provided with an observation window (110).

5. The cleaning device for sagger according to claim 1, characterized in that: The invention also comprises a lifting mechanism (400), wherein the lifting mechanism (400) comprises a bracket (410) and a lifting assembly (420), wherein the bracket (410) is fixedly connected to the bottom of the outer circulation conveying line (20), and the bracket (410) is provided with the dust hood (300) and the lifting assembly (420), wherein the lifting assembly (420) is passed through the outer circulation conveying line (20), and the top end of the lifting assembly (420) is movably supported on the bottom of the sagger (30), and the lifting assembly (420) raises or lowers the height of the sagger (30) so as to enable the sagger (30) to leave or enter the outer circulation conveying line (20).

6. The cleaning device for sagger according to claim 5, characterized in that: It also includes an infrared sensor, which is arranged on the outer circulation conveying line (20), and the infrared sensor is arranged corresponding to the lifting component (420).

7. The cleaning device for sagger according to claim 5, characterized in that: The lifting assembly (420) comprises two bases (422) and two telescopic cylinders (424), each of the bases (422) being inserted through the outer circulation conveying line (20), and each of the bases (422) being fixed to the top of the bracket (410), and the two bases (422) being respectively located on both sides of the sagger (30), the two bases (422) being arranged in one-to-one correspondence with the two telescopic cylinders (424), and each of the telescopic cylinders (424) being arranged on the corresponding base (422), and the side walls of each of the telescopic cylinders (424) being provided with a clamping member (426), the two clamping members (426) being arranged in a corresponding flush relationship, and the two clamping members (426) being located at the bottom of the sagger (30), so that the two clamping members (426) are used to clamp the sagger (30) together.

8. The cleaning device for sagger according to claim 7, characterized in that: Each of the telescopic cylinders (424) is provided with a telescopic guide column (424a); and / or the clamping member (426) is a clamping cylinder.

9. A sagger transmission device, characterized in that: It comprises an external circulation conveying line (20) and the sagger cleaning device according to any one of claims 1 to 8, wherein the external circulation conveying line (20) is arranged through the through cavity (101) to convey the sagger (30).

10. The sagger conveying device according to claim 9, characterized in that: The outer circulation conveyor line (20) comprises a frame (21), a driving motor (22), a chain (23), a plurality of transmission gear sets (24) and a plurality of conveying wheel sets (25); the frame (21) is arranged in the through cavity (101); the shield (100) is arranged at the bottom of the frame (21); the power output end of the driving motor (22) is connected to one of the transmission gear sets (24); the plurality of conveying wheel sets (25) are all rotatably connected to the frame (21); each of the conveying wheel sets (25) is provided with at least one transmission gear set (24); and the chain (23) is respectively sleeved on the transmission gear sets (24) corresponding to the plurality of conveying wheel sets (25).

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