Filtering device for fermentation liquor extracted oil

Abstract

The utility model relates to the technical field of fermentation liquor, in particular to a filter device for fermentation liquor extracted oil, which comprises a mounting unit, a filter unit, a filter unit, a filter unit, a filter unit, a filter unit, a filter unit, a filter unit, a filter unit, a filter unit and a filter unit, the filter unit comprises a machine body, a lock catch, an end cover, a water injection pipe and a motor, the lock catch is arranged on the outer side of the machine body, and the end cover is arranged on the machine body; and the cleaning unit comprises a centrifugal barrel arranged on the inner wall of the machine body, a driving assembly arranged in the centrifugal barrel, a connecting assembly arranged on the driving assembly and a flow guide assembly arranged on the connecting assembly. The filtering device for the fermentation liquor extracted oil has the beneficial effects that solid particles accumulated on the inner wall of the filter cartridge can be cleaned and collected in a centralized manner by arranging the cleaning assembly in a solid-liquid separation process, so that the efficient solid-liquid separation efficiency is achieved, and the separation efficiency is improved by arranging the separation assembly. Liquid is allowed to be taken out while the centrifugal process is carried out, continuous operation can be realized, and the production efficiency and the sample processing capacity are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fermentation liquid, in particular to a filtering device for extracting oil from fermentation liquid. Background Art

[0002] Fermentation broth refers to the liquid produced in the process of biological fermentation, which contains fermentation products, metabolites, microorganisms and components of the culture medium. Microorganisms and other solid residues can be separated by centrifugation or filtration, and then the oil can be extracted using an appropriate extraction method (such as solvent extraction or dehydration extraction).

[0003] In the process of solid-liquid separation of fermentation broth, it is necessary to manually take out the separated liquid and clean the separated solid particles after each centrifugation process, which will increase the operation time and workload and reduce work efficiency. In addition, during the centrifugation process, solid particles will be adsorbed on the filter cartridge. The accumulation of solid particles will hinder the ability of the fermentation broth to pass through the filter cartridge, resulting in reduced solid-liquid separation efficiency and prolonged separation time. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the problems in the above or prior art that solid and liquid need to be manually removed after the centrifugation process, and that solid particles are adsorbed on the filter cartridge, resulting in reduced separation efficiency, the present utility model is proposed.

[0006] Therefore, the utility model aims to provide a filtering device for extracting oil from fermentation liquid.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: an installation unit, including a body, a lock arranged on the outside of the body, an end cover arranged on the body, a water injection pipe arranged on the end cover, and a motor arranged on the end cover; a cleaning unit, including a centrifugal cylinder arranged on the inner wall of the body, a driving assembly arranged in the centrifugal cylinder, a connecting assembly arranged on the driving assembly, a guide assembly arranged on the connecting assembly, and a receiving assembly arranged on the centrifugal cylinder; a separation unit, including a movable assembly arranged on the receiving assembly, a sealing assembly arranged on the movable assembly, a drainage assembly arranged at the bottom of the body, a lifting assembly arranged at the bottom of the body, and an extrusion assembly arranged at the bottom of the body and matched with the lifting assembly.

[0008] As a preferred solution of the filtering device for extracting oil from fermentation liquid described in the utility model, the driving assembly includes a rotating disk arranged on the inner side of the centrifugal cylinder, a driving rod arranged on the rotating disk, and a clamping groove arranged on the driving rod; the clamping groove cooperates with the output end of the motor.

[0009] As a preferred solution of the filtering device for extracting oil from fermentation liquid described in the utility model, the connecting assembly includes a filter cartridge arranged on the rotating disk, a limiting ring arranged on the outside of the filter cartridge, and an inclined panel arranged on the centrifugal cylinder; the limiting ring is rotatably connected to the inner side of the inclined panel.

[0010] As a preferred solution of the filtration device for extracting oil from fermentation liquid of the utility model, the guide assembly includes a guide plate arranged on the inclined plate, an inclined surface arranged on the inner side of the guide plate, and a scraper arranged on the guide plate.

[0011] As a preferred solution of the filtration device for extracting oil from fermentation liquid described in the utility model, the receiving assembly includes a receiving ring plate arranged on the inner side of the end cover, a drainage hole arranged on the inner wall of the centrifugal cylinder, and a storage cylinder arranged at the lower end of the centrifugal cylinder.

[0012] As a preferred solution of the filtering device for extracting oil from fermentation liquid of the utility model, the movable component includes an annular groove arranged in the storage cylinder, a lifting plate arranged in the annular groove, and a conical surface arranged on the lifting plate.

[0013] As a preferred solution of the filtering device for extracting oil from fermentation liquid of the utility model, the sealing component includes an elliptical groove arranged on the lifting plate and a blocking block arranged on the storage cylinder; the elliptical groove and the blocking block are matched.

[0014] As a preferred solution of the filtering device for extracting oil from fermentation liquid described in the utility model, the drainage assembly includes a drainage port at the bottom of the storage cylinder, a guide pipe arranged in the drainage port, a positioning ring groove arranged at the bottom of the storage cylinder, and a connecting rod arranged in the guide pipe; the upper end of the connecting rod is fixedly connected to the lifting plate.

[0015] As a preferred solution of the filtering device for extracting oil from fermentation liquid described in the utility model, the lifting component includes a triangular ring arranged on the outside of the guide pipe, a lifting groove arranged on the inner wall of the drain outlet, a displacement groove arranged on the inner wall of the lifting groove, and a driven plate arranged in the displacement groove.

[0016] As a preferred solution of the filtering device for extracting oil from fermentation liquid described in the utility model, the extrusion assembly includes a rotating groove arranged on the inner wall of the displacement groove, a rotating shaft arranged in the rotating groove, and an eccentric wheel arranged on the outer side of the rotating shaft; the eccentric wheel and the driven plate cooperate with each other.

[0017] The beneficial effects of the utility model are as follows: by setting up a cleaning component, solid particles accumulated on the inner wall of the filter cartridge can be cleaned and collected in a centralized manner during the solid-liquid separation process, thereby achieving efficient solid-liquid separation efficiency; by setting up a separation component, liquid can be taken out while the centrifugation process is in progress, continuous operation can be achieved, and production efficiency and sample processing capacity can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0019] Figure 1 This is a schematic diagram of the overall structure of the filtering device for extracting oil from fermentation liquid according to the utility model.

[0020] Figure 2 It is a cross-sectional schematic diagram of the utility model of the filtering device for extracting oil from fermentation liquid.

[0021] Figure 3 for Figure 2 Enlarged schematic diagram at point A in the middle.

[0022] Figure 4 It is a partial structural schematic diagram of the filtering device for extracting oil from fermentation liquid according to the utility model.

[0023] Figure 5 for Figure 2 Enlarged schematic diagram of point B in the middle.

[0024] Figure 6 for Figure 2 Enlarged schematic diagram at point C in the middle. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0029] Example 1

[0030] Reference Figures 1 to 3 , which is the first embodiment of the utility model, and provides a filtering device for extracting oil from fermentation liquid, which can achieve the effect of cleaning and collecting solid particles accumulated on the inner wall of the filter cylinder 203a during the solid-liquid separation process, including: the end cover 103 is fixedly connected to the upper end of the body 101 through multiple sets of lock buckles 102 arranged on the outer side thereof, a storage cylinder 205c is arranged at the bottom of the inner wall of the body 101, a centrifugal cylinder 201 is fixedly installed at the upper end of the storage cylinder 205c, a circular hole is opened at the bottom of the centrifugal cylinder 201, a rotating disk 202a is rotatably connected to the inner side of the circular hole, a driving rod 202b is arranged at the upper end of the rotating disk 202a, a clamping groove 202c is opened at the upper end of the driving rod 202b to adapt to the output end of the motor 105, so that the driving rod 202b is driven to rotate by the motor 105, and a filter cylinder 203a is arranged above the rotating disk 202a and located on the outer side of the driving rod 202b.

[0031] Furthermore, a circle of limiting ring 203b is provided on the outer side of the filter cartridge 203a near the upper end, and an inclined panel 203c is provided on the upper end of the centrifugal cartridge 201. The inner wall of the inclined panel 203c fits the outer wall of the filter cartridge 203a, and the limiting ring 203b is rotatably connected to the inner wall of the inclined panel 203c. The existence of the limiting ring 203b can prevent the filter cartridge 203a from moving, thereby ensuring that it is correctly aligned and connected to the inclined panel 203c, which helps to ensure the stability of the filter cartridge 203a during rotation.

[0032] Among them, three groups of guide plates 204a are evenly distributed on the outside of the inclined plate 203c. The guide plate 204a is in the shape of a "7". The lower part thereof fits the inner wall of the filter cartridge 203a and a scraper 204c is arranged on the inner side of the guide plate 204a. The outer wall of the scraper 204c also fits the inner wall of the filter cartridge 203a. The inner wall of the guide plate 204a is provided with an inclined surface 204b. The inclined surface 204b plays a guiding role. Under the action of the centrifugal force generated by the continuous rotation of the filter cartridge 203a, the scraped solid particles will be continuously pushed to the highest point of the inclined surface 204b, thereby escaping from the filter cartridge 203a. A receiving ring plate 205a is provided inside the guide plate 204a between the machine body 101 and the centrifugal cylinder 201, and the inner side of the receiving ring plate 205a is hollowed out, and the upper end of the receiving ring plate 205a is fixedly connected to the inner wall of the end cover 103, so that when the end cover 103 is fixedly connected to the machine body 101 through the lock buckle 102, the receiving ring plate 205a is stably placed on the outer side of the centrifugal cylinder 201, and at this time, the solid particles sliding down from the outer side of the inclined plate 203c will be collected by the receiving ring plate 205a, and wait for the fermentation liquid separation work to be completed, and then removed from the machine body 101 together with the end cover 103 for centralized treatment.

[0033] When in use, the fermentation liquid is injected into the body 101 through the water injection pipe 104 opened at the upper end of the end cover 103, and the fermentation liquid will enter the range of the filter cylinder 203a. Driven by the motor 105, the filter cylinder 203a will generate centrifugal force driven by the rotating disk 202a, and the fermentation liquid will splash outward under the action of the centrifugal force. The grid of the filter cylinder 203a does not allow the solid particles in the fermentation liquid to pass through, so they are blocked, and the liquid will pass through the filter cylinder 203a and hit the inner wall of the centrifugal cylinder 201, and through the bottom of the centrifugal cylinder 201, the filter cylinder 203a will be opened. The drainage hole 205b enters the storage cylinder 205c and waits for discharge. When the filter cylinder 203a is driven by the motor 105 to rotate counterclockwise, the solid particles adsorbed on the inner wall of the filter barrel will be scraped off by the scraper 204c and guided upward through the inclined surface 204b, thereby driving the cleaned solid particles to move upward, and then the upper end of the guide plate 204a is guided out and flows into the inclined panel 203c. Since the inclined panel 203c is in an inclined shape, the fixed particles will slide outward. Since the inclined panel 203c is in an inclined shape, the fixed particles will slide outward.

[0034] Example 2

[0035] Reference Figure 5, which is the second embodiment of the utility model. Different from the previous embodiment, this embodiment provides a cleaning unit 200 for a filter device for extracting oil from fermented liquid, which solves the problem that the separated liquid needs to be manually taken out after the centrifugation process, which increases the operation time and workload and reduces the work efficiency. The embodiment includes a drain port 303a at the bottom of the inner wall of the storage cylinder 205c and the body 101, and the drain holes 205b at the upper and lower ends are movably connected to the guide pipe 303b. The bottom of the inner wall of the storage cylinder 205c is opened near the outer side. There is a circle of annular grooves 301a, and a lifting plate 301b is movably connected up and down in the annular groove 301a. The upper surface of the lifting plate 301b presents a conical surface 301c, that is, it is a downward inclined surface 204b, which can guide the flow direction of the liquid. There are several elliptical grooves 302a starting from the upper surface of the lifting plate 301b, and several blocking blocks 302b are fixedly installed on the inner side of the annular groove 301a at the bottom of the storage cylinder 205c. It should be noted that the position, number and size of the blocking blocks 302b and the elliptical grooves 302a are adapted.

[0036] When in use, through the cooperation of the blocking block 302b and the elliptical groove 302a, the lifting plate 301b can divide the space of the storage tube 205c into two layers, upper and lower. When the blocking block 302b and the elliptical groove 302a overlap, there is no gap in the lifting plate 301b, and the area above the lifting plate 301b can be used to store water. When the blocking block 302b is separated from the elliptical groove 302a and a gap appears between the blocking block 302b and the lifting plate 301b, the liquid stored above the lifting plate 301b will flow into the elliptical groove 302a through the guidance of the conical surface 301c, and flow into the bottom of the lifting plate 301b, that is, the bottom of the storage tube 205c, and be discharged into the body 101 through the guide pipe 303b set at the bottom of the storage tube 205c.

[0037] Example 3

[0038] Reference Figures 5 and 6 , which is the third embodiment of the utility model. Different from the previous embodiment, this embodiment provides a filtering device for extracting oil from fermented liquid, which solves the problem that the existing device cannot discharge the separated liquid during the separation work. It includes the filtering device for extracting oil from fermented liquid in the above embodiment, including the lifting component 304, the triangular ring 304a outside the guide tube 303b, the lifting groove 304b on the inner wall of the drain outlet 303a, the displacement groove 304c on the inner wall of the lifting groove 304b, and the driven plate 304d in the displacement groove 304c. The extrusion component 305 includes a rotating groove 305a on the inner wall of the displacement groove 304c, a rotating shaft 305b in the rotating groove 305a, and an eccentric wheel 305c outside the rotating shaft 305b;

[0039] The eccentric wheel 305c and the driven plate 304d cooperate with each other.

[0040] Specifically, a lifting groove 304b is provided on the inner wall of the drain outlet 303a opened in the body 101. The lifting groove 304b is in a circular ring shape, and two groups of triangular rings 304a are connected to its inner wall for vertical up and down movement. The inner side of the triangular ring 304a is fixedly connected to the guide pipe 303b. The triangular ring 304a is in a semicircular ring shape and is respectively arranged on both sides of the lifting groove 304b, and its lower side is in a slope shape. Two groups of displacement grooves 304c are provided on the inner wall of the body 101 near the bottom. The displacement grooves 304c are symmetrically arranged, and the inner side of the displacement groove 304c is connected to the lifting groove 304b, and the outer side is connected to the rotating groove 305a. A driven plate 304d is horizontally slidably connected in the displacement groove 304c. The opposite surfaces of the driven plates 304d on both sides are inclined and matched with the inclined surfaces on the lower side of the triangular ring 304a. A rotating shaft 305b is arranged in the rotating groove 305a, and an eccentric wheel 305c is arranged on the outer side of the rotating shaft 305b. The eccentric wheel 305c rotates with the rotating shaft 305b as the center. The rotating shaft 305b is not arranged at the center of the eccentric wheel 305c, which will cause the eccentric wheel 305c to be displaced with the rotating shaft 305b as the center. The eccentric wheel 305c rotates around the rotating shaft 305b, and the rotation of the eccentric wheel 305c will cause the eccentric wheel 305c itself to be displaced, so that the eccentric wheel 305c has both rotational motion and mobile motion, realizing the compound motion of rotation and translation.

[0041] When in use, due to the gravity of the separation unit 300 itself, the triangular ring 304a will move downward, and will exert downward pressure on the driven plate 304d that is in contact with the lower inclined surface. Since the driven plate 304d can only move horizontally, this will cause the driven plates 304d on both sides to move outward at the same time. Since the outer side of the driven plate 304d is blocked by the eccentric wheel 305c, the driven plate 304d cannot move outward, and it is necessary to drive the eccentric wheel 305c to rotate by pushing the handle exposed on the outer side of the eccentric wheel 305c upward. Under the limitation of the rotating shaft 305b, the eccentric wheel 305c rotates 45 degrees clockwise with the rotating shaft 305b as the center, and the eccentric wheel 305c is displaced, and a gap appears at the position where the eccentric wheel 305c originally blocked the driven plate 304d, which allows the driven plate 304d to move outward at this time. The driven plate 304d moves until the outer side of the driven plate 304d contacts the eccentric wheel 305c again, and the driven plate 304d can no longer move. At this time, the triangular ring 304a can move downward, thereby driving the guide tube 303b to move downward. At the same time, the guide tube 303b drives the lifting plate 301b to move downward through the connecting rod 303d, so that the blocking block 302b is re-limited in the elliptical groove 302a, and the storage cylinder 205c stores water. Anyway, by shifting the eccentric wheel 305c downward, the driven plate 304d can be squeezed through the outer side of the eccentric wheel 305c, and the triangular ring 304a is simultaneously applied with the driven plates 304d on both sides with an upward thrust, so as to drive the guide tube 303b to move upward, and the lifting plate 301b is pushed upward through the connecting rod 303d to unlock the blocking block 302b, and the storage cylinder 205c can drain water.

[0042] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0043] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0044] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A filtering device for extracting oil from fermentation liquid, characterized in that: include, The installation unit (100) comprises a body (101), a lock buckle (102) arranged on the outside of the body (101), an end cover (103) arranged on the body (101), a water injection pipe (104) arranged on the end cover (103), and a motor (105) arranged on the end cover (103); A cleaning unit (200) comprises a centrifugal cylinder (201) arranged on the inner wall of the body (101), a driving assembly (202) arranged in the centrifugal cylinder (201), a connecting assembly (203) arranged on the driving assembly (202), a flow guiding assembly (204) arranged on the connecting assembly (203), and a receiving assembly (205) arranged on the centrifugal cylinder (201); The separation unit (300) comprises a movable component (301) arranged on the receiving component (205), a sealing component (302) arranged on the movable component (301), a drainage component (303) arranged at the bottom of the body (101), a lifting component (304) arranged at the bottom of the body (101), and an extrusion component (305) arranged at the bottom of the body (101) and cooperating with the lifting component (304).

2. The filtration device for extracting oil from fermented liquid according to claim 1, characterized in that: The driving assembly (202) comprises a rotating disk (202a) arranged inside the centrifugal cylinder (201), a driving rod (202b) arranged on the rotating disk (202a), and a clamping groove (202c) arranged on the driving rod (202b); The clamping groove (202c) matches with the output end of the motor (105).

3. The filtration device for extracting oil from fermented liquid according to claim 2, characterized in that: The connecting assembly (203) comprises a filter cartridge (203a) arranged on the rotating disk (202a), a limiting ring (203b) arranged on the outside of the filter cartridge (203a), and an inclined plate (203c) arranged on the centrifugal cartridge (201); The limiting ring (203b) is rotatably connected to the inner side of the inclined panel (203c).

4. The filtration device for extracting oil from fermented liquid according to claim 3, characterized in that: The flow guide assembly (204) comprises a guide plate (204a) arranged on the inclined plate (203c), an inclined surface (204b) arranged on the inner side of the guide plate (204a), and a scraper (204c) arranged on the guide plate (204a).

5. The filtration device for extracting oil from fermented liquid according to claim 4, characterized in that: The receiving assembly (205) comprises a receiving ring plate (205a) arranged on the inner side of the end cover (103), a drainage hole (205b) arranged on the inner wall of the centrifugal cylinder (201), and a storage cylinder (205c) arranged at the lower end of the centrifugal cylinder (201).

6. The filtering device for extracting oil from fermentation liquid according to claim 5, characterized in that: The movable component (301) comprises an annular groove (301a) disposed in the storage tube (205c), a lifting plate (301b) disposed in the annular groove (301a), and a conical surface (301c) disposed on the lifting plate (301b).

7. The filtration device for extracting oil from fermentation liquid according to claim 6, characterized in that: The sealing assembly (302) comprises an elliptical groove (302a) arranged on the lifting plate (301b), and a blocking block (302b) arranged on the storage cylinder (205c); The oval groove (302a) and the blocking block (302b) are matched with each other.

8. The filtration device for extracting oil from fermentation liquid according to claim 7, characterized in that: The drainage assembly (303) comprises a drainage port (303a) at the bottom of the storage tube (205c), a flow guide tube (303b) arranged in the drainage port (303a), a positioning ring groove (303c) arranged at the bottom of the storage tube (205c), and a connecting rod (303d) arranged in the flow guide tube (303b); The upper end of the connecting rod (303d) is fixedly connected to the lifting plate (301b).

9. The filtration device for extracting oil from fermentation liquid according to claim 8, characterized in that: The lifting assembly (304) comprises a triangular ring (304a) arranged on the outside of the guide pipe (303b), a lifting groove (304b) arranged on the inner wall of the drain outlet (303a), a displacement groove (304c) arranged on the inner wall of the lifting groove (304b), and a driven plate (304d) arranged in the displacement groove (304c).

10. The filtering device for extracting oil from fermentation liquid according to claim 9, characterized in that: The extrusion assembly (305) comprises a rotation groove (305a) arranged on the inner wall of the displacement groove (304c), a rotation shaft (305b) arranged in the rotation groove (305a), and an eccentric wheel (305c) arranged on the outer side of the rotation shaft (305b); The eccentric wheel (305c) and the driven plate (304d) cooperate with each other.

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