Reclaimed water recycling device with additional reverse osmosis structure

Abstract

The utility model relates to a reclaimed water recycling device with an additional reverse osmosis structure, which comprises a shell and a low-concentration water pipe arranged in the shell, the outer wall of the low-concentration water pipe is coated with a reverse osmosis membrane, a sleeve is rotatably arranged in the shell, a pressure regulating component is arranged on the shell, and the pressure regulating component is connected with the reverse osmosis membrane. One end of the shell is provided with a water inlet, the other end of the shell is provided with a pressure adjusting assembly, the pressure adjusting assembly is connected with the sleeve through a transmission structure, the other end of the shell is provided with a high-concentration water pipe, the high-concentration water pipe is provided with a discharge assembly, and the discharge assembly is connected with the transmission structure through a synchronous structure. The sleeve, the pressure regulating assembly, the transmission structure, the discharge assembly and the synchronous structure are matched with one another, so that the reverse osmosis membrane is cleaned, the pollution of the reverse osmosis membrane is reduced, the water passing amount is increased, and meanwhile, high-concentration sewage and impurities in the shell can be discharged, so that the pressure in the shell is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically a greywater reuse device with an additional reverse osmosis structure. Background Technology

[0002] Wastewater reuse systems are equipment used for wastewater treatment. They treat industrial wastewater to different levels using various physical, chemical, and biological methods to bring the water quality up to specific process requirements before reusing it in the process.

[0003] The wastewater treatment unit mainly treats the wastewater from the gasification and methanol units. In actual operation, the suspended solids (SS) in the effluent cannot consistently meet the Class A discharge standard. Therefore, the main focus of the modification is on the SS index of the effluent. Part of the effluent after wastewater treatment is then used for reclaimed water treatment.

[0004] The wastewater reuse system will include an RO (reverse osmosis) unit for the reuse of the generated freshwater. However, due to the high hardness and SiO2 content of the incoming water, the reuse system cannot operate stably and is not yet ready for delivery. The subsequent addition of an RO system is also unlikely to operate stably; therefore, the primary focus is on removing hardness and SiO2 from the wastewater. The existing lime-soda ash hardening treatment, flocculation, and inclined plate sedimentation tanks will be retained as needed.

[0005] However, various problems may occur during the use of RO devices, such as a sudden increase in conductivity, the appearance of white flocculent matter or floating matter in the finished water, membrane fouling, membrane element damage, and a decrease in permeate flow. Among these, membrane fouling is mainly caused by an inadequate pretreatment system or design problems in the reverse osmosis membrane system, which may lead to the deposition of pollutants in the feed water on the membrane surface, forming a fouling layer, reducing membrane flux and effluent water quality. Since the water flow rate into the RO device is generally constant, when the membrane flux decreases, the permeate flow rate of the RO device decreases, which causes the internal pressure to gradually increase. If the pressure of the RO device is not reduced or the water flow rate is not increased in time, it may cause damage to the RO device. Utility Model Content

[0006] The purpose of this invention is to provide a greywater recycling device with an additional reverse osmosis structure to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A greywater recycling device with an additional reverse osmosis structure includes an outer shell and a low-concentration water pipe disposed inside the outer shell. The outer wall of the low-concentration water pipe is covered with a reverse osmosis membrane, and the low-concentration water pipe is provided with multiple through holes. One end of the outer shell is provided with an inlet connected to a sedimentation tank.

[0009] The outer casing has a rotatable sleeve that is tightly fitted around the outside of the reverse osmosis membrane. When the sleeve rotates, it can clean the outer wall of the reverse osmosis membrane.

[0010] The outer shell is provided with a pressure regulating component, which is connected to the sleeve through a transmission structure. When the pressure inside the outer shell increases, the pressure regulating component will be activated, thereby causing the sleeve to rotate under the drive of the transmission structure.

[0011] A high-concentration water pipe is provided at the other end of the outer shell, and a discharge component is provided on the high-concentration water pipe. The discharge component is connected to the transmission structure through a synchronization structure. During the operation of the transmission structure, the synchronization structure will drive the discharge component to operate, so that the high-concentration wastewater inside the outer shell is discharged from the high-concentration water pipe.

[0012] As a further embodiment of this utility model:

[0013] The pressure regulating assembly includes a hollow tube disposed on the housing and a slide rod that slides with the hollow tube, the hollow tube connecting the housing to the outside;

[0014] A sealing element is provided at one end of the slide rod, and the sealing element is located inside the hollow tube.

[0015] As a further improvement of this utility model:

[0016] The size of the sealing element is the same as the inner diameter of the hollow tube, and a spring is installed inside the hollow tube;

[0017] The two ends of the spring abut against the inner wall of the seal and the end of the hollow tube away from the slide rod, respectively, and the spring is in a compressed state.

[0018] As a further improvement of this utility model:

[0019] The transmission structure includes a fixed frame disposed inside the housing and a first toothed plate that slides with the fixed frame, and a toothed ring is provided on the outer wall of the sleeve;

[0020] The other end of the slide bar is provided with a second toothed plate, which meshes with the toothed ring, and the second toothed plate is fixed to the first toothed plate by an L-shaped rod.

[0021] As a further improvement of this utility model:

[0022] The first toothed plate is provided with a T-shaped slider, and the fixed frame is provided with a T-shaped groove along its length. The T-shaped slider is located in the T-shaped groove and slides with each other.

[0023] As a further improvement of this utility model:

[0024] The sleeve sidewall is provided with multiple through grooves, which are evenly distributed along the circumference.

[0025] Each of the multiple channels is equipped with a scraper, and each of the multiple scrapers is in contact with the outer wall of the reverse osmosis membrane.

[0026] As a further improvement of this utility model:

[0027] The discharge assembly includes a valve mounted on the high-concentration water pipe, the valve having a valve shaft, and a first bevel gear at the end of the valve shaft.

[0028] As a further improvement of this utility model:

[0029] The synchronization structure includes a rotating rod rotatably mounted on the outer casing, with a second bevel gear and a gear respectively mounted at both ends of the rotating rod;

[0030] The second bevel gear meshes with the first bevel gear, and the gear meshes with the first tooth plate.

[0031] Compared with the prior art, the beneficial effects of this utility model are:

[0032] Wastewater in the sedimentation tank enters the outer shell through the inlet. The wastewater first passes through the sleeve and then is filtered by the reverse osmosis membrane before entering the low-concentration water pipe through multiple through-holes. After long-term use, a large amount of impurities will adhere to the outer wall of the reverse osmosis membrane, thereby reducing the water flow rate of the reverse osmosis membrane and increasing the pressure inside the shell. At this time, the pressure regulating component will operate under the action of pressure and drive the sleeve to rotate through the transmission structure. The rotating sleeve will clean the impurities on the outer wall of the reverse osmosis membrane. In addition, the transmission structure will also drive the discharge component on the high-concentration water pipe to operate through the synchronization structure. The operating discharge component will discharge the high-concentration wastewater and impurities inside the shell to reduce the pressure inside the shell.

[0033] This application utilizes a shell, inlet, low-concentration water pipe, through-hole, and reverse osmosis membrane to purify wastewater. Furthermore, through the cooperation of the sleeve, pressure regulating component, transmission structure, discharge component, and synchronization structure, the reverse osmosis membrane is cleaned, reducing membrane fouling and increasing water flow. At the same time, high-concentration wastewater and impurities inside the shell are discharged to reduce the pressure inside the shell. Attached Figure Description

[0034] Figure 1 A schematic diagram of the overall structure of a wastewater recycling device with an additional reverse osmosis structure, according to one embodiment.

[0035] Figure 2 A half-sectional schematic diagram of the overall structure of a wastewater recycling device with an additional reverse osmosis structure, according to one embodiment.

[0036] Figure 3 A cross-sectional view of the shell and hollow tube structure of a wastewater recycling device with an added reverse osmosis structure in one embodiment.

[0037] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0038] Figure 5 A cross-sectional view of the outer shell structure of a greywater recycling device with an added reverse osmosis structure in one embodiment.

[0039] Figure 6 for Figure 5 Enlarged view of section B in the middle.

[0040] Figure 7 A structurally exploded view of the pressure regulating component in one embodiment of a greywater recycling device with an additional reverse osmosis structure.

[0041] Figure 8 This is a partial transmission structure and synchronization structure breakdown diagram of a wastewater recycling device with an added reverse osmosis structure in one embodiment.

[0042] Figure 9 This is a schematic diagram of the overall structure of a wastewater recycling device with an added reverse osmosis structure from another perspective.

[0043] Figure 10 A split view of the low-concentration water pipe, reverse osmosis membrane, and sleeve structure in one embodiment of a greywater recycling device with an additional reverse osmosis structure.

[0044] Figure 11 A sleeve structure diagram of one embodiment of a greywater recycling device with an additional reverse osmosis structure.

[0045] Figure 12 for Figure 11 Enlarged view of point C.

[0046] In the diagram: 1. Outer shell; 101. Inlet; 2. Low-concentration water pipe; 201. Through hole; 3. Reverse osmosis membrane; 4. Sleeve; 401. Through groove; 4011. Scraper; 5. High-concentration water pipe; 6. Hollow pipe; 7. Slide rod; 701. Seal; 8. Spring; 9. Fixing bracket; 901. T-shaped slide groove; 10. Toothed plate No. 1; 1001. T-shaped slider; 11. Gear ring; 12. Toothed plate No. 2; 13. L-shaped rod; 14. Valve; 15. Valve shaft; 16. Bevel gear No. 1; 17. Rotating rod; 18. Bevel gear No. 2; 19. Gear. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] Furthermore, the elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0049] Please see Figures 1-12 In this embodiment of the present invention, a greywater recycling device with an additional reverse osmosis structure includes a shell 1 and a low-concentration water pipe 2 disposed inside the shell 1. The outer wall of the low-concentration water pipe 2 is covered with a reverse osmosis membrane 3. The low-concentration water pipe 2 is provided with a plurality of through holes 201. One end of the shell 1 is provided with an inlet 101 connected to a sedimentation tank.

[0050] The sleeve 4 is rotatably disposed inside the outer shell 1, and the sleeve 4 is tightly fitted on the outside of the reverse osmosis membrane 3. When the sleeve 4 rotates, it can clean the outer wall of the reverse osmosis membrane 3.

[0051] The outer shell 1 is provided with a pressure regulating component, which is connected to the sleeve 4 through a transmission structure. When the pressure inside the outer shell 1 increases, the pressure regulating component will be activated, thereby causing the sleeve 4 to rotate under the drive of the transmission structure.

[0052] A high-concentration water pipe 5 is provided at the other end of the outer shell 1. A discharge component is provided on the high-concentration water pipe 5. The discharge component is connected to the transmission structure through a synchronization structure. During the operation of the transmission structure, the synchronization structure will drive the discharge component to operate, so that the high-concentration sewage inside the outer shell 1 is discharged from the high-concentration water pipe 5.

[0053] In this scheme, the wastewater in the sedimentation tank enters the outer shell 1 through the inlet 101. The wastewater first passes through the sleeve 4 and then is filtered by the reverse osmosis membrane 3. After passing through multiple through holes 201, it enters the low-concentration water pipe 2 and is then discharged smoothly through the low-concentration water pipe 2. After long-term use, a large amount of impurities will adhere to the outer wall of the reverse osmosis membrane 3, thereby reducing the water flow of the reverse osmosis membrane 3 and increasing the pressure inside the outer shell 1. At this time, the pressure regulating component will operate under the action of pressure and drive the sleeve 4 to rotate through the transmission structure. The rotating sleeve 4 will clean the impurities on the outer wall of the reverse osmosis membrane 3. In addition, the transmission structure will also drive the discharge component on the high-concentration water pipe 5 to operate through the synchronization structure. The operating discharge component will discharge the high-concentration wastewater and impurities inside the outer shell 1 to reduce the pressure inside the outer shell 1.

[0054] In the process of removing suspended solids (SS) and reclaimed water for silica removal and hardening in the sedimentation tank, chemicals are added, generating a large amount of sludge. The removal mechanisms include:

[0055] Mechanism of suspended solids removal by coagulation, flocculation and sedimentation:

[0056] (1) The double-layer compressor should add electrolytes to the solution to increase the ion concentration in the solution, which will reduce the thickness of the diffusion layer. When two colloidal particles approach each other, the zeta potential decreases due to the reduced thickness of the diffusion layer, thus reducing the repulsive force between them and allowing the colloidal particles to aggregate rapidly.

[0057] (2) Adsorption charge neutralization mechanism: Adsorption charge neutralization refers to the strong adsorption effect of the particle surface on the part with opposite charge. Because this adsorption neutralizes part of its charge and reduces electrostatic repulsion, it is easy to approach and adsorb with other particles.

[0058] (3) Adsorption bridging principle: Adsorption bridging mainly refers to the mutual adsorption between polymers and colloidal particles, but the colloidal particles themselves do not come into direct contact, causing the colloidal particles to aggregate into large flocs.

[0059] (4) Mechanism of precipitate trapping: When metal salts or metal oxides and hydroxides are used as coagulants, and the dosage is large enough to rapidly form metal oxide or metal carbonate precipitates, the colloidal particles in the water can be trapped by these precipitates during their formation. When the precipitates are positively charged, the precipitation rate can be accelerated due to the presence of cations in the solution. In addition, the colloidal particles in the water themselves can serve as the nucleus for the formation of these metal hydroxide precipitates. Therefore, the optimal dosage of coagulant is inversely proportional to the concentration of the substance being removed, that is, the more colloidal particles there are, the less metal coagulant is required.

[0060] Commonly used coagulants are iron salt and aluminum salt coagulants, and commonly used flocculants are anionic or cationic high molecular weight polyacrylamide.

[0061] Silicon removal mechanism:

[0062] The mechanism of magnesium-based silica removal involves the adsorption of silica compounds on the surface of magnesium hydroxide-containing particles, forming insoluble magnesium silicate. To some extent, the coagulation of silica colloids and the formation of calcium silicate also occur. One explanation for the interaction between magnesium and silica is that magnesium oxide particles partially hydrate in water to form complex molecular structures of MgO and Mg(OH)₂. Mg(OH)₂ molecules partially dissociate and enter the solution, forming complex colloidal particles surrounded by positively charged OH⁻ ions. Silicate compounds existing in different forms in water can exchange ions with these magnesium oxide colloidal particles, forming insoluble magnesium silicate compounds.

[0063] Small amounts of silica compounds react with CaCO3 precipitated from lime treatment to form a precipitate.

[0064] As a further embodiment of this utility model, the pressure regulating component includes a hollow tube 6 disposed on the outer shell 1 and a slide rod 7 that slides with the hollow tube 6, the hollow tube 6 connecting the outer shell 1 to the outside.

[0065] One end of the slide rod 7 is provided with a sealing element 701, and the sealing element 701 is located inside the hollow tube 6;

[0066] The size of the sealing element 701 is the same as the inner diameter of the hollow tube 6, and a spring 8 is provided inside the hollow tube 6;

[0067] The two ends of the spring 8 abut against the inner wall of the seal 701 and the end of the hollow tube 6 away from the slide rod 7, respectively, and the spring 8 is in a compressed state.

[0068] In this embodiment, since the hollow tube 6 connects the outer shell 1 to the outside, and the slide rod 7 is slidably engaged with the hollow tube 6, and a sealing element 701 is provided at one end of the slide rod 7, the sealing element 701 is located inside the hollow tube 6, so when the pressure inside the outer shell 1 increases, the sealing element 701 will tend to move the slide rod 7 away from the outer shell 1; and because the spring 8 is present and in a compressed state, the sealing element 701 will interact with the spring 8. When the force exerted by the pressure on the sealing element 701 is greater than the elastic force of the spring 8, the sealing element 701 will move the slide rod 7 away from the outer shell 1, and the spring 8 will be further compressed;

[0069] When the pressure inside the outer casing 1 decreases, the spring 8 will perform a restoring action.

[0070] As a further embodiment of this utility model, the transmission structure includes a fixed frame 9 disposed inside the outer shell 1 and a first toothed plate 10 that slides with the fixed frame 9, and a toothed ring 11 is provided on the outer wall of the sleeve 4;

[0071] The other end of the slide bar 7 is provided with a second toothed plate 12, which meshes with the toothed ring 11, and the second toothed plate 12 is fixed to the first toothed plate 10 by an L-shaped rod 13.

[0072] In this embodiment, since the second toothed plate 12 fixed on the other end of the slide rod 7 and the toothed ring 11 fixed on the outer wall of the sleeve 4 mesh with each other, the second toothed plate 12 will also move with the slide rod 7 during the movement of the slide rod 7, and through the interaction with the toothed ring 11, it will drive the sleeve 4 to rotate.

[0073] Since the second toothed plate 12 is fixed to the first toothed plate 10 via the L-shaped rod 13, and the first toothed plate 10 and the fixed frame 9 fixed inside the outer shell 1 slide together, the first toothed plate 10 will also move along with the second toothed plate 12 during its movement.

[0074] As a further embodiment of this utility model, a T-shaped slider 1001 is provided on the first toothed plate 10, and a T-shaped groove 901 is provided on the fixing frame 9 along its length direction. The T-shaped slider 1001 is located in the T-shaped groove 901 and slides and cooperates with each other.

[0075] In this embodiment, since the T-shaped slider 1001 is located in the T-shaped groove 901 and slides with each other, the sliding engagement between the fixing frame 9 and the first toothed plate 10 is realized.

[0076] As a further embodiment of this utility model, the sleeve 4 has a plurality of through grooves 401 on its side wall, and the plurality of through grooves 401 are evenly distributed along the circumference.

[0077] Each of the multiple channels 401 is provided with a scraper 4011, and each of the multiple scrapers 4011 is in contact with the outer wall of the reverse osmosis membrane 3.

[0078] In this embodiment, since the sleeve 4 has multiple through grooves 401 on its side wall, and the multiple through grooves 401 are evenly distributed along the circumference, sewage can pass through the multiple through grooves 401 and then be filtered by the reverse osmosis membrane 3.

[0079] Furthermore, since multiple channels 401 are equipped with scrapers 4011, and these scrapers 4011 are in contact with the outer wall of the reverse osmosis membrane 3, during the rotation of the sleeve 4, the multiple scrapers 4011 will scrape the impurities on the outer wall of the reverse osmosis membrane 3.

[0080] As a further embodiment of this utility model, the discharge assembly includes a valve 14 disposed on the high-concentration water pipe 5, a valve shaft 15 disposed on the valve 14, and a first bevel gear 16 disposed at the end of the valve shaft 15.

[0081] In this embodiment, since the high-concentration water pipe 5 is connected to the outer shell 1 and a valve 14 is provided on the high-concentration water pipe 5, when the first bevel gear 16 drives the valve shaft 15 to rotate, the valve 14 will switch the high-concentration water pipe 5 from the closed state to the open state, thereby allowing the high-concentration sewage and impurities inside the outer shell 1 to be discharged, thereby reducing the pressure inside the outer shell 1.

[0082] As a further embodiment of this utility model, the synchronization structure includes a rotating rod 17 rotatably mounted on the outer casing 1, and a second bevel gear 18 and a gear 19 are respectively provided at both ends of the rotating rod 17.

[0083] The second bevel gear 18 and the first bevel gear 16 mesh with each other, and the gear 19 and the first tooth plate 10 mesh with each other.

[0084] In this embodiment, since the second bevel gear 18 and the first bevel gear 16 mesh with each other, and the gear 19 and the first gear plate 10 mesh with each other, and the second bevel gear 18 and the gear 19 are respectively located at both ends of the rotating rod 17, the first bevel gear 16 will rotate along with the first gear plate 10 as it moves.

[0085] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0086] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A greywater recycling device with an additional reverse osmosis structure, comprising a housing (1) and a low-concentration water pipe (2) disposed inside the housing (1), characterized in that, The outer wall of the low-concentration water pipe (2) is covered with a reverse osmosis membrane (3), and the low-concentration water pipe (2) is provided with multiple through holes (201). One end of the outer shell (1) is provided with an inlet (101) connected to the sedimentation tank. The outer shell (1) is rotatably provided with a sleeve (4), and the sleeve (4) is tightly fitted on the outside of the reverse osmosis membrane (3). When the sleeve (4) rotates, it can clean the outer wall of the reverse osmosis membrane (3). A pressure regulating component is provided on the outer shell (1). The pressure regulating component is connected to the sleeve (4) through a transmission structure. When the pressure inside the outer shell (1) increases, the pressure regulating component will operate, thereby causing the sleeve (4) to rotate under the drive of the transmission structure. A high-concentration water pipe (5) is provided at the other end of the outer shell (1). A discharge component is provided on the high-concentration water pipe (5). The discharge component is connected to the transmission structure through a synchronization structure. During the operation of the transmission structure, the synchronization structure will drive the discharge component to move, so that the high-concentration sewage inside the outer shell (1) is discharged from the high-concentration water pipe (5).

2. A greywater reuse device with an additional reverse osmosis structure according to claim 1, characterized in that, The pressure regulating assembly includes a hollow tube (6) disposed on the housing (1) and a slide rod (7) slidably engaged with the hollow tube (6), the hollow tube (6) connecting the housing (1) to the outside; One end of the slide rod (7) is provided with a sealing element (701), which is located inside the hollow tube (6).

3. A greywater reuse device with an additional reverse osmosis structure according to claim 2, characterized in that, The size of the sealing element (701) is the same as the inner diameter of the hollow tube (6), and a spring (8) is provided inside the hollow tube (6). The two ends of the spring (8) abut against the inner wall of the seal (701) and the hollow tube (6) away from the slide rod (7), respectively, and the spring (8) is in a compressed state.

4. A greywater reuse device with an additional reverse osmosis structure according to claim 2, characterized in that, The transmission structure includes a fixed frame (9) disposed inside the outer shell (1) and a first toothed plate (10) that slides with the fixed frame (9), and a toothed ring (11) is provided on the outer wall of the sleeve (4). The other end of the slide bar (7) is provided with a second toothed plate (12), which meshes with the toothed ring (11), and the second toothed plate (12) is fixed to the first toothed plate (10) by an L-shaped rod (13).

5. A greywater reuse device with an additional reverse osmosis structure according to claim 4, characterized in that, A T-shaped slider (1001) is provided on the first toothed plate (10), and a T-shaped groove (901) is provided on the fixing frame (9) along its length direction. The T-shaped slider (1001) is located in the T-shaped groove (901) and slides and cooperates with each other.

6. A greywater reuse device with an additional reverse osmosis structure according to claim 1, characterized in that, The sleeve (4) has multiple through grooves (401) on its side wall, and the multiple through grooves (401) are evenly distributed along the circumference; Each of the multiple channels (401) is provided with a scraper (4011), and each of the multiple scrapers (4011) is attached to the outer wall of the reverse osmosis membrane (3).

7. A greywater reuse device with an additional reverse osmosis structure according to claim 4, characterized in that, The discharge assembly includes a valve (14) disposed on the high-concentration water pipe (5), a valve shaft (15) disposed on the valve (14), and a first bevel gear (16) disposed at the end of the valve shaft (15).

8. A greywater reuse device with an additional reverse osmosis structure according to claim 7, characterized in that, The synchronization structure includes a rotating rod (17) rotatably mounted on the outer casing (1), and a second bevel gear (18) and a gear (19) are respectively mounted on both ends of the rotating rod (17). The second bevel gear (18) and the first bevel gear (16) mesh with each other, and the gear (19) and the first tooth plate (10) mesh with each other.

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