Diaphragm paper briquetting device

Abstract

The utility model provides a diaphragm paper briquetting device. The diaphragm paper briquetting device comprises a material box, a pressing rod, a first pressing plate, a feeding pipe, a discharging pipe, a water spraying pipe, a water inlet pipe and a water outlet pipe, the material box is further provided with a via hole, the pressing rod movably penetrates through the via hole and is partially located in the material box, and the first pressing plate is connected to the pressing rod and is located in the material box; the discharging pipe is provided with a cooling cavity and a forming cavity, and the water inlet pipe and the water outlet pipe are communicated with the cooling cavity. During briquetting, water is injected into the material box through the water spraying pipe, so that the humidity of diaphragm paper fragments is guaranteed, the diaphragm paper is conveniently extruded and formed, and the briquetting effect is good. Furthermore, the cooling cavity is formed in the discharging pipe, heat in the forming cavity can be effectively conducted, the situation that the diaphragm paper adheres to the inner wall of the forming cavity to cause machine blocking is avoided, the situation that the diaphragm paper is heated and burnt due to the too high temperature is also avoided, and safety is high.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery separator paper recycling, and particularly to a separator paper briquetting device. Background Art

[0002] With the rising oil prices and the rapid development of electric vehicles in recent years, new energy vehicles in China have been vigorously developed and will maintain a long-term development trend. Especially with the large investment in lithium batteries in the new energy field, there will be problems in the recycling of waste lithium batteries in the later stage. Currently, the recycling process for lithium batteries still uses crushing, drying, sorting, and screening. Among them, the separator paper generated during sorting is still a major problem. The separator paper has a low density, a low ignition point, takes up space, and is prone to causing the accumulation of warehouse materials, posing a relatively high safety risk.

[0003] In terms of treatment, due to the high impurity content of the separator paper, which contains various substances such as copper, aluminum, valuable metals, and graphite, it cannot be recycled. The current treatment process only involves burning it in an incinerator. The existing treatment method has low efficiency, occupies a large space, burns quickly, and the temperature in the furnace is uncontrollable, with extremely high risks. Therefore, it is considered to reduce the volume of the separator paper, that is, to briquette the separator paper to achieve the effect of volume reduction by briquetting.

[0004] Existing briquetting machines, such as a biomass fuel briquetting machine disclosed in a Chinese patent with the application number CN200920257918.9, are provided with a water inlet pipe and a water outlet pipe to reduce the working temperature during the briquetting and forming of the briquetting machine, ensuring the temperature range during the briquetting and forming of the material. However, its technical field belongs to the field of biomass fuel briquetting and forming, and it cannot be directly applied to the briquetting and forming of battery separator paper. Moreover, the effect of only setting a water inlet pipe and a water outlet pipe to reduce the temperature during briquetting is not good.

[0005] Therefore, a separator paper briquetting device with good briquetting effect and effectively reducing the temperature during briquetting and forming is needed. Summary of the Utility Model

[0006] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a separator paper briquetting device with good briquetting effect and effectively reducing the temperature during briquetting and forming.

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

[0008] A diaphragm paper briquetting device comprises a material box, a pressure rod, a first pressure plate, a feed pipe, a discharge pipe, a water spray pipe, a water inlet pipe and a water outlet pipe; the feed pipe, the discharge pipe and the water spray pipe are all connected to the interior of the material box; the material box is provided with a through hole, the pressure rod is movably arranged through the through hole and is partially located in the material box, the first pressure plate is connected to the pressure rod and is located in the material box, and at least a part of the first pressure plate is arranged corresponding to the discharge pipe; the discharge pipe is provided with a cooling cavity and a forming cavity, the cooling cavity is opened along the circumference of the tube wall of the discharge pipe, the forming cavity is located in the discharge pipe, and the water inlet pipe and the water outlet pipe are respectively connected to the cooling cavity.

[0009] In one embodiment, the molding cavity is conical in shape, and the aperture of the upper end of the molding cavity is smaller than the aperture of the lower end of the molding cavity.

[0010] In one embodiment, the first pressing plate is provided with an arc-shaped protrusion, and the arc-shaped protrusion is arranged opposite to the discharge pipe.

[0011] In one embodiment, the diameter of the arc-shaped protrusion is smaller than the aperture of the forming cavity.

[0012] In one embodiment, there are multiple discharge pipes, and the multiple discharge pipes are arranged side by side.

[0013] In one embodiment, the diaphragm paper briquetting device further includes a storage box, wherein a support is provided in the storage box, and both ends of the support are respectively connected to the storage box and the material box, and the storage box is connected to the discharge pipe.

[0014] In one embodiment, the diaphragm paper pressing device also includes a cutting assembly, which includes a cutter and a first telescopic motor. The first telescopic motor is connected to the storage box, and the cutter is connected to the telescopic end of the first telescopic motor. The cutter is located on the side of the discharge pipe away from the material box.

[0015] In one embodiment, the diaphragm paper pressing device also includes a pre-pressing component, which includes a second pressing plate and a second telescopic motor. The second telescopic motor is connected to the storage box, the telescopic end portion of the second telescopic motor is located in the material box, and the second pressing plate is connected to the telescopic end of the second telescopic motor and is located in the material box.

[0016] In one embodiment, there are two pre-pressing assemblies, the two pre-pressing assemblies are arranged oppositely on both sides of the material box, and the two second pressing plates are arranged oppositely in the material box.

[0017] In one embodiment, the diaphragm paper briquetting device further includes a transmission assembly, which includes a driving motor, a driving wheel, a transmission belt and an eccentric wheel. The driving wheel is connected to the power output end of the driving motor, the eccentric wheel is connected to the pressing rod, and the transmission belt is sleeved on the driving wheel and the eccentric wheel.

[0018] Compared with the prior art, the present disclosure has at least the following advantages:

[0019] 1. For the above diaphragm paper briquetting device, the water spray pipe is internally communicated with the material box. When briquetting, water is injected into the material box through the water spray pipe, and the moisture infiltrates the diaphragm paper inside the material box to ensure the humidity of the diaphragm paper fragments, which is convenient for the diaphragm paper to be extruded into shape. The briquetting effect is good, and the volume of the diaphragm paper is effectively reduced.

[0020] 2. The blanking pipe is provided with a cooling cavity and a forming cavity. The cooling cavity is arranged along the circumferential direction of the blanking pipe, and the forming cavity is arranged at the center of the blanking pipe. The water inlet pipe and the water outlet pipe are respectively communicated with the cooling cavity. When briquetting, the diaphragm paper is pressed into the forming cavity to form a block. At the same time, the temperature in the forming cavity rises sharply. At this time, water is input into the cooling cavity through the water inlet pipe, which can effectively conduct heat to the temperature in the forming cavity, avoiding the diaphragm paper fragments sticking to the inner wall of the forming cavity due to excessive temperature during the briquetting process, resulting in machine jamming, and improving the forming efficiency; at the same time, avoiding the temperature in the blanking pipe being too high, causing the diaphragm paper to catch fire after forming, with high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of a diaphragm paper briquetting device according to an embodiment;

[0023] Figure 2 For Figure 1 Another schematic structural diagram of the diaphragm paper briquetting device shown;

[0024] Figure 3 For Figure 1 A schematic cross-sectional structural diagram of the diaphragm paper briquetting device shown;

[0025] Figure 4 For Figure 1 Another schematic cross-sectional structural diagram of the diaphragm paper briquetting device shown;

[0026] Figure 5 For Figure 1Another cross-sectional structural schematic diagram of the diaphragm paper pressing device shown.

[0027] Reference numerals: 10 - diaphragm paper pressing device; 100 - material box; 200 - pressing rod; 210 - first pressing plate; 110 - feeding pipe; 120 - discharging pipe; 130 - water spraying pipe; 140 - water inlet pipe; 150 - water outlet pipe; 101 - through hole; 1201 - cooling cavity; 1202 - forming cavity; 211 - arc-shaped protrusion; 300 - storage box; 310 - support column; 400 - cutting assembly; 410 - cutter; 420 - first telescopic motor; 500 - pre-pressing assembly; 510 - second pressing plate; 520 - second telescopic motor; 600 - transmission assembly; 610 - driving motor; 620 - driving wheel; 630 - conveyor belt; 640 - eccentric wheel. Detailed implementation manners

[0028] To facilitate the understanding of the present disclosure, the present disclosure will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present disclosure are shown 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, these embodiments are provided so that the understanding of the disclosure content of the present disclosure is more thorough and comprehensive.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate 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 embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present disclosure belongs. The terms used in the description of the present disclosure in this specification 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 of the related listed items.

[0031] To better understand the technical solutions and beneficial effects of the present disclosure, the following further details the present disclosure with specific embodiments:

[0032] As Figures 1 to 5As shown, the diaphragm paper briquetting device 10 of an embodiment includes a material box 100, a pressing rod 200, a first pressing plate 210, a feeding pipe 110, a discharging pipe 120, a water spraying pipe 130, a water inlet pipe 140 and a water outlet pipe 150; the feeding pipe 110, the discharging pipe 120 and the water spraying pipe 130 are all communicated with the interior of the material box 100; the feeding pipe 110 is used for conveying diaphragm paper fragments into the material box 100, the discharging pipe 120 is used for the briquetting and discharging of the diaphragm paper fragments, and the water spraying pipe 130 is used for spraying water into the material box 100 during briquetting; the material box 100 is further provided with a through hole 101, the pressing rod 200 is movably inserted through the through hole 101 and partially located inside the material box 100, the first pressing plate 210 is connected to the pressing rod 200 and located inside the material box 100, and at least a part of the first pressing plate 210 is correspondingly arranged with the discharging pipe 120; the pressing rod 200 and the first pressing plate 210 are used for extruding the diaphragm paper fragments into the discharging pipe 120, so that the diaphragm paper fragments are formed into blocks inside the discharging pipe 120; the discharging pipe 120 is provided with a cooling cavity 1201 and a forming cavity 1202, the cooling cavity 1201 is circumferentially arranged along the pipe wall of the discharging pipe 120, the forming cavity 1202 is located inside the discharging pipe 120, the water inlet pipe 140 and the water outlet pipe 150 are respectively communicated with the cooling cavity 1201, and the cooling cavity 1201 is used for reducing the sharply rising temperature inside the forming cavity 1202 during briquetting.

[0033] In this embodiment, after the waste battery diaphragm paper fragments enter the material box 100 from the feeding pipe 110, the water spraying pipe 130 sprays water into the material box 100, so that the moisture wets the diaphragm paper fragments inside the material box 100, ensuring that the humidity of the fragments is between 15% and 30%, which is convenient for the diaphragm paper fragments to be extruded and formed. Then the pressing rod 200 drives the first pressing plate 210 to extrude the diaphragm paper fragments into the forming cavity 1202 of the discharging pipe 120, and the diaphragm paper fragments are extruded into blocks inside the forming cavity 1202, reducing the volume of the diaphragm paper. At this time, the temperature inside the forming cavity 1202 rises sharply. Water is injected into the cooling cavity 1201 through the water inlet pipe 140, the moisture takes away the temperature inside the forming cavity 1202, and then is discharged from the water outlet pipe 150. The circulating inflow and outflow of water can effectively conduct heat on the temperature inside the forming cavity 1202 and reduce the temperature inside the forming pipe.

[0034] The above-mentioned diaphragm paper briquetting device 10 has a water spray pipe 130 communicating with the inside of the material box 100. When briquetting, water is injected into the material box 100 through the water spray pipe 130, and the moisture infiltrates the diaphragm paper inside the material box 100 to ensure the humidity of the diaphragm paper fragments, facilitating the extrusion and molding of the diaphragm paper, achieving good briquetting effect and effectively reducing the volume of the diaphragm paper. The blanking pipe 120 is provided with a cooling cavity 1201 and a forming cavity 1202. The cooling cavity 1201 is opened along the circumferential direction of the blanking pipe 120, and the forming cavity 1202 is opened at the center of the blanking pipe 120. The water inlet pipe 140 and the water outlet pipe 150 are respectively communicated with the cooling cavity 1201. When briquetting, the diaphragm paper is pressed into the forming cavity 1202 to form a block. At the same time, the temperature in the forming cavity 1202 rises sharply. At this time, water is input into the cooling cavity 1201 through the water inlet pipe 140, which can effectively conduct heat to the temperature in the forming cavity 1202, avoiding the diaphragm paper fragments sticking to the inner wall of the forming cavity 1202 due to excessive temperature during the briquetting process, causing machine jamming, and improving the forming efficiency; at the same time, avoiding the temperature in the blanking pipe 120 being too high and causing the heated combustion of the diaphragm paper after forming, with high safety.

[0035] As Figure 4 shown, in one of the embodiments, the forming cavity 1202 is conical, and the upper aperture of the forming cavity 1202 is smaller than the lower aperture of the forming cavity 1202. In this embodiment, the forming cavity 1202 is a conical cavity, and the diameter of the hole at the upper end of the cavity is smaller than that at the lower end, which is beneficial to reducing the friction between the diaphragm paper fragments and the inner wall of the forming cavity 1202 during the downward movement after being extruded, reducing the heat generated by the friction, slowing down the temperature rise in the forming cavity 1202, and at the same time making the forming process of the diaphragm paper smoother and improving the efficiency.

[0036] As Figure 3 and Figure 4 shown, in one of the embodiments, the first pressing plate 210 is provided with an arc-shaped protruding portion 211. The arc-shaped protruding portion 211 is arranged opposite to the blanking pipe 120, and the diameter of the arc-shaped protruding portion 211 is smaller than the aperture of the forming cavity 1202. In this embodiment, the arc-shaped protruding portion 211 is aligned with the hole at the upper end of the blanking pipe 120, and the diameter is smaller than the aperture of the upper end hole. Such a setting enables the arc-shaped protruding portion 211 to enter the forming cavity 1202, and can more smoothly press the diaphragm paper fragments into the forming cavity 1202, improving the briquetting efficiency of the diaphragm paper fragments.

[0037] As Figures 3 to 5 shown, in one of the embodiments, there are multiple blanking pipes 120, and the multiple blanking pipes 120 are arranged side by side. In this embodiment, there are three blanking pipes 120, and three blanking pipes 120 are simultaneously provided for the briquetting and forming of the diaphragm paper fragments to improve the briquetting efficiency. In other embodiments, according to the actual production requirements, different numbers of blanking pipes 120 can also be set.

[0038] As shown Figures 1 to 5 In one embodiment, the diaphragm paper briquetting device 10 further includes a storage box 300. A support column 310 is arranged in the storage box 300. Two ends of the support column 310 are respectively connected to the storage box 300 and the material box 100. The storage box 300 is communicated with the blanking pipe 120. In this embodiment, the storage box 300 is used to collect the diaphragm paper after briquetting in the blanking pipe 120. There are four support columns 310, which are respectively arranged at four diagonals of the storage box 300. Two ends of the support column 310 are respectively connected to the storage box 300 and the material box 100 to provide a supporting and fixing function.

[0039] As shown Figures 1 to 3 In one embodiment, the diaphragm paper briquetting device 10 further includes a cutting assembly 400. The cutting assembly 400 includes a cutter 410 and a first telescopic motor 420. The first telescopic motor 420 is connected to the storage box 300. The cutter 410 is connected to the telescopic end of the first telescopic motor 420. The cutter 410 is located on the side of the blanking pipe 120 away from the material box 100. In this embodiment, the cutter 410 is arranged at the blanking outlet of the blanking pipe 120. When the diaphragm paper fragments in the forming cavity 1202 are briquetted and leave the forming cavity 1202, at this time, driven by the first telescopic motor 420, the telescopic end of the first telescopic motor 420 drives the cutter 410 to cut the formed diaphragm paper, further dividing the diaphragm paper into pieces. The divided diaphragm paper falls into the storage box 300, which is convenient for subsequent collection.

[0040] As shown Figure 1 and Figure 3 In one embodiment, the diaphragm paper briquetting device 10 further includes a pre-pressing assembly 500. The pre-pressing assembly 500 includes a second pressing plate 510 and a second telescopic motor 520. The second telescopic motor 520 is connected to the storage box 300. A part of the telescopic end of the second telescopic motor 520 is located in the material box 100. The second pressing plate 510 is connected to the telescopic end of the second telescopic motor 520 and is located in the material box 100. In this embodiment, the second pressing plate 510 of the pre-pressing assembly 500 is located in the material box 100. Driven by the second telescopic motor 520, the telescopic end of the second telescopic motor 520 drives the second pressing plate 510 to preliminarily extrude the diaphragm paper fragments in the material box 100, keeping the diaphragm paper fragments in a compressed state, improving the density of the diaphragm paper briquette, and improving the volume reduction rate of the diaphragm paper fragments after being pressed.

[0041] As shown Figure 1 and Figure 3As shown, in one embodiment, there are two preloading components 500. The two preloading components 500 are oppositely arranged on both sides of the material box 100, and the two second pressing plates 510 are oppositely arranged inside the material box 100. In this embodiment, two preloading components 500 are provided for initially extruding the diaphragm paper fragments, and the two second pressing plates are oppositely arranged inside the material box 100. During extrusion, the two second pressing plates 510 move towards the first pressing plate 210 driven by the two second telescopic motors 520, pressing the diaphragm paper in the material box 100 tightly. Then, the second pressing plates 510 remain stationary, maintaining the state of pressing the diaphragm paper tightly. Then, the first pressing plate 210 presses down the diaphragm paper driven by the pressing rod 200, improving the compaction density of the diaphragm paper pressed into the forming cavity 1202 and increasing the volume reduction rate of the diaphragm paper fragments after being pressed.

[0042] As Figure 1 and Figure 2 As shown, in one embodiment, the diaphragm paper pressing block device 10 further includes a transmission component 600. The transmission component 600 includes a driving motor 610, a driving wheel 620, a transmission belt 630, and an eccentric wheel 640. The driving wheel 620 is connected to the power output end of the driving motor 610, the eccentric wheel 640 is connected to the pressing rod 200, and the transmission belt 630 is sleeved on the driving wheel 620 and the eccentric wheel 640. In this embodiment, by providing a transmission component 600 connected to the pressing rod 200, power for reciprocating linear motion is provided to the pressing rod 200, improving the working efficiency of the pressing rod 200.

[0043] Compared with the prior art, the present disclosure has at least the following advantages:

[0044] For the above-mentioned diaphragm paper pressing block device 10, the water spraying pipe 130 is communicated with the inside of the material box 100. During pressing, water is injected into the material box 100 through the water spraying pipe 130, and the moisture wets the diaphragm paper inside the material box 100 to ensure the humidity of the diaphragm paper fragments, facilitating the extrusion molding of the diaphragm paper. The pressing effect is good, and the volume of the diaphragm paper is effectively reduced. The blanking pipe 120 is provided with a cooling cavity 1201 and a forming cavity 1202. The cooling cavity 1201 is opened along the circumferential direction of the blanking pipe 120, and the forming cavity 1202 is opened at the center of the blanking pipe 120. The water inlet pipe 140 and the water outlet pipe 150 are respectively communicated with the cooling cavity 1201. During pressing, the diaphragm paper is pressed into the forming cavity 1202 to form a block. At the same time, the temperature in the forming cavity 1202 rises sharply. At this time, water is input into the cooling cavity 1201 through the water inlet pipe 140, which can effectively conduct heat to the temperature in the forming cavity 1202, avoiding the diaphragm paper fragments sticking to the inner wall of the forming cavity 1202 due to excessive temperature during the pressing process, resulting in machine jamming, and improving the forming efficiency; at the same time, avoiding the temperature in the blanking pipe 120 being too high, causing the diaphragm paper to catch fire after forming, with high safety.

[0045] The above-described embodiments merely represent several implementation manners of the present disclosure. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can still be made, and these all fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent shall be subject to the appended claims.

Claims

1. A diaphragm paper briquetting device, characterized in that, It includes a feed bin (100), a pressing rod (200), a first pressing plate (210), a feed pipe (110), a blanking pipe (120), a water spraying pipe (130), a water inlet pipe (140) and a water outlet pipe (150); The feed pipe (110), the blanking pipe (120) and the water spraying pipe (130) are all communicated with the interior of the feed bin (100); The feed bin (100) is provided with a through hole (101), the pressing rod (200) is movably inserted through the through hole (101) and partially located inside the feed bin (100), the first pressing plate (210) is connected to the pressing rod (200) and located inside the feed bin (100), and at least part of the first pressing plate (210) is arranged corresponding to the blanking pipe (120); The blanking pipe (120) is provided with a cooling cavity (1201) and a forming cavity (1202), the cooling cavity (1201) is circumferentially arranged along the pipe wall of the blanking pipe (120), the forming cavity (1202) is located inside the blanking pipe (120), and the water inlet pipe (140) and the water outlet pipe (150) are respectively communicated with the cooling cavity (1201).

2. The diaphragm paper briquetting device according to claim 1, characterized in that, The forming cavity (1202) is conical, and the aperture of the upper end of the forming cavity (1202) is smaller than the aperture of the lower end of the forming cavity (1202).

3. The diaphragm paper briquetting device according to claim 1, characterized in that, The first pressing plate (210) is provided with an arc-shaped convex part (211), and the arc-shaped convex part (211) is arranged opposite to the blanking pipe (120).

4. The diaphragm paper briquetting device according to claim 3, characterized in that, The diameter of the arc-shaped convex part (211) is smaller than the aperture of the forming cavity (1202).

5. The diaphragm paper briquetting device according to claim 1, characterized in that, There are multiple blanking pipes (120), and the multiple blanking pipes (120) are arranged side by side.

6. The diaphragm paper briquetting device according to claim 1, characterized in that, The diaphragm paper pressing block device further includes a storage box (300), a support column (310) is arranged inside the storage box (300), two ends of the support column (310) are respectively connected to the storage box (300) and the feed bin (100), and the storage box (300) is communicated with the blanking pipe (120).

7. The diaphragm paper briquetting device according to claim 6, characterized in that, The diaphragm paper pressing block device further includes a cutting component (400), the cutting component (400) includes a cutter (410) and a first telescopic motor (420), the first telescopic motor (420) is connected to the storage box (300), the cutter (410) is connected to the telescopic end of the first telescopic motor (420), and the cutter (410) is located on the side of the blanking pipe (120) away from the feed bin (100).

8. The diaphragm paper briquetting device according to claim 6, characterized in that, The diaphragm paper pressing block device further includes a pre-pressing component (500), the pre-pressing component (500) includes a second pressing plate (510) and a second telescopic motor (520), the second telescopic motor (520) is connected to the storage box (300), a part of the telescopic end of the second telescopic motor (520) is located inside the feed bin (100), and the second pressing plate (510) is connected to the telescopic end of the second telescopic motor (520) and located inside the feed bin (100).

9. The diaphragm paper briquetting device according to claim 8, wherein, There are two preloading components (500), and the two preloading components (500) are oppositely arranged on both sides of the material box (100), and the two second pressing plates (510) are oppositely arranged inside the material box (100).

10. The diaphragm paper briquetting device according to claim 1, characterized in that, The diaphragm paper pressing block device further includes a transmission component (600), and the transmission component (600) includes a driving motor (610), a driving wheel (620), a transmission belt (630) and an eccentric wheel (640). The driving wheel (620) is connected to the power output end of the driving motor (610), the eccentric wheel (640) is connected to the pressing rod (200), and the transmission belt (630) is sleeved on the driving wheel (620) and the eccentric wheel (640).

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