A double-effect concentrator for traditional Chinese medicine

Abstract

The application belongs to the technical field of concentrators, in particular to a double-effect concentrator for traditional Chinese medicines, which comprises a tank body, the upper lateral wall of the tank body is fixedly connected with a steam pipe, the top center of the tank body is rotationally connected with a rotating shaft, the bottom of the rotating shaft is fixedly connected with a cleaning frame, the top of the tank body is provided with a driving assembly, the driving assembly is used to drive the rotating shaft to rotate, the top of the tank body is provided with an air outlet, the air outlet is provided with a filtering assembly, the filtering assembly is fixedly connected with an air outlet pipe, and the top of the tank body is provided with a liquid supply assembly. Through the filtering assembly, the medicinal liquid components in the steam are adsorbed by the activated carbon after the steam enters the containing box, which is beneficial to improve the purity of the steam and avoid the pollution of the air outlet pipe.

Description

Technical Field

[0001] This invention belongs to the field of concentrator technology, specifically a dual-effect concentrator for traditional Chinese medicine. Background Technology

[0002] Traditional Chinese medicine (TCM) refers to natural medicines and their processed substitutes that are guided by TCM theory, have a unique theoretical system and application forms, and are used to prevent and treat diseases and have rehabilitation and health care effects. It mainly includes plant medicines, animal medicines, and mineral medicines.

[0003] In the preparation of traditional Chinese medicine preparations, the medicine is usually placed in a double-effect concentrator, and then high-temperature steam is pumped into the concentrator to evaporate the water in the medicine, thereby concentrating the medicine.

[0004] Currently, during the concentration of traditional Chinese medicine in a double-effect concentrator, some of the medicinal components diffuse with the steam and condense on the inner wall of the tank, making it inconvenient to clean. On the other hand, the medicinal components not only remain in the steam pipes, contaminating them, but also enter the next stage of the concentrator with the steam, affecting the medicines and reagents in the next stage of the concentrator.

[0005] Therefore, the present invention provides a dual-effect concentrator for traditional Chinese medicine. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a dual-effect concentrator for traditional Chinese medicine, comprising a tank body, a steam pipe fixedly connected to the upper side wall of the tank body, a rotating shaft rotatably connected to the top center of the tank body, a cleaning rack fixedly connected to the bottom of the rotating shaft, a driving assembly provided on the top of the tank body for driving the rotating shaft to rotate, an air outlet provided on the top of the tank body, a filter assembly provided at the air outlet, an air outlet pipe fixedly connected to the filter assembly, and a liquid supply assembly provided on the top of the tank body.

[0008] Preferably, the drive assembly includes a mounting frame, which is fixedly connected to the top of the tank body. A motor is fixedly connected to the mounting frame, and the rotation shaft of the motor passes through the top surface of the mounting frame and is fixedly connected to the rotation shaft.

[0009] Preferably, the filter assembly includes a filter box, which is fixedly connected to the top of the tank. A container is fixedly connected inside the filter box. The container is hollow and contains activated carbon.

[0010] Preferably, the liquid supply assembly includes a cylindrical cover, multiple through holes, and a flow channel one. The cylindrical cover is fixedly connected to the top of the tank and rotatably connected to the rotating shaft. The multiple through holes are opened through the upper side wall of the rotating shaft. The flow channel one is disposed inside the rotating shaft. The cleaning frame is provided with a flow channel two, which is connected to the flow channel one. Multiple nozzles are fixedly connected to the side wall of the cleaning frame at equal intervals. Each of the multiple nozzles is fixedly connected with a one-way valve. A striking element is disposed inside the flow channel two for striking the cleaning frame. A liquid supply component is disposed on one side of the cylindrical cover.

[0011] Preferably, the liquid supply component includes a water pump, which is fixedly connected to the top of the tank. A three-way valve is fixedly connected to the outlet end of the water pump. Water pipe one and water pipe two are fixedly connected to both sides of the three-way valve, respectively. The end of water pipe one away from the three-way valve is fixedly connected to the cylindrical cover, and the end of water pipe two away from the three-way valve is fixedly connected to the air outlet pipe.

[0012] Preferably, the striking element includes multiple support shafts, which are rotatably connected to the inner wall of the flow channel two. Four rotating plates are fixedly connected to each of the multiple support shafts, and striking blocks are fixedly connected to the ends of the four rotating plates by rubber strips.

[0013] Preferably, the top surface of the cleaning frame is provided with a groove, and a lifting block is slidably connected in the groove. A guide is provided at the top of the lifting block to press the lifting block downward, and a top support is provided at the bottom of the lifting block to elastically support the lifting block.

[0014] Preferably, the top support includes four mounting slots, which are formed at the corners of the groove. Each of the four mounting slots is slidably connected to a guide frame. The top of the guide frame passes through the top of the mounting slot and is fixedly connected to the bottom of the lifting block. A spring is sleeved on the lower part of the guide frame, and the bottom of the spring is fixedly connected to the bottom surface of the mounting slot.

[0015] Preferably, the guide includes two inclined grooves and two guide blocks. The two inclined grooves are formed on the top surface of the lifting block, and the two guide blocks are fixedly connected to both sides of the air outlet. The ends of the two guide blocks are provided with guide surfaces.

[0016] The beneficial effects of this invention are as follows:

[0017] The present invention discloses a dual-effect concentrator for traditional Chinese medicine. By setting up a filter component, after the steam enters the container, the medicinal liquid components in the steam are adsorbed by activated carbon, which helps to improve the purity of the steam and helps to prevent the exhaust pipe from being contaminated.

[0018] The present invention discloses a dual-effect concentrator for traditional Chinese medicine. By incorporating a liquid supply component, during the concentration process, the supply component delivers a portion of the filtered steam to a rotating shaft. This steam is then sprayed obliquely onto the inner wall of the tank via nozzles on a cleaning frame. On one hand, the high-temperature steam, combined with the cleaning frame, enhances the cleaning effect on the inner wall of the tank. On the other hand, the downward tilt of the nozzles causes the steam to also tilt downwards, effectively blowing the cleaned-off liquid downwards. This downward flow of the liquid into the tank reduces residue and waste. After concentration, when cleaning the inner wall of the tank is required, the supply component provides cleaning liquid to the rotating shaft. The cleaning liquid is then sprayed from the nozzles to clean the inner wall of the tank. Simultaneously, a one-way valve prevents liquid from entering the flow channel. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a first-view schematic diagram of the present invention;

[0021] Figure 2 This is a second-view schematic diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the tank body section in this invention;

[0023] Figure 4 This is a schematic diagram of the top structure of the tank in this invention;

[0024] Figure 5 This is a schematic diagram of the cleaning frame structure of the present invention;

[0025] Figure 6 This is a partial structural cross-section diagram of the cleaning frame of the present invention;

[0026] Figure 7 This is a partial structural diagram of the top of the tank of the present invention;

[0027] Figure 8 This is a schematic diagram of the filter box of the present invention.

[0028] Figure 9 This is a partial structural schematic diagram of the present invention.

[0029] In the diagram: 1. Tank body; 101. Vent; 2. Steam pipe; 3. Vent pipe; 4. Fixing frame; 5. Motor; 6. Rotating shaft; 7. Cleaning frame; 701. Groove; 8. Through hole; 9. Flow channel one; 10. Flow channel two; 11. Nozzle; 12. Cylindrical cover; 13. Water pump; 14. Three-way valve; 15. Water pipe one; 16. Water pipe two; 17. Filter box; 18. Container box; 19. Lifting block; 20. Mounting groove; 21. Guide frame; 22. Spring; 23. Inclined groove; 24. Guide block; 25. Support shaft; 26. Rotating plate; 27. Striking block. Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] Combination Figures 1 to 3 As shown in the figure, an embodiment of the present invention provides a dual-effect concentrator for traditional Chinese medicine, comprising a tank 1, a steam pipe 2 fixedly connected to the upper side wall of the tank 1, a rotating shaft 6 rotatably connected to the top center of the tank 1, a cleaning rack 7 fixedly connected to the bottom of the rotating shaft 6, a driving assembly provided on the top of the tank 1 for driving the rotating shaft 6 to rotate, an air outlet 101 provided on the top of the tank 1, a filter assembly provided at the air outlet 101, an air outlet pipe 3 fixedly connected to the filter assembly, and a liquid supply assembly provided on the top of the tank 1. During operation, the traditional Chinese medicine liquid to be concentrated is placed in the tank 1, with the liquid level below the height of the steam pipe 2. High-temperature steam is then supplied into the tank 1 through the steam pipe 2 to concentrate the traditional Chinese medicine liquid in the tank 1. During the concentration process, the water in the liquid evaporates, forming steam, which enters the filter assembly through the air outlet 101, facilitating the removal of medicinal components from the steam and preventing... The steam-free process prevents the liquid components from entering the exhaust pipe 3, thus avoiding contamination. The steam, after filtration, enters the exhaust pipe 3 and then the next stage tank 1. Simultaneously, during the liquid concentration process, the drive assembly is activated, rotating the rotating shaft 6 and the cleaning frame 7. The rotation of the cleaning frame 7 removes the liquid components from the inner wall of tank 1 and also agitates the liquid, improving the evaporation efficiency of the water and consequently increasing the concentration efficiency. After concentration, the tank 1 is cleaned. The drive assembly rotates the rotating shaft 6 and the cleaning frame 7, while the liquid supply assembly provides cleaning liquid to them. As the cleaning frame 7 rotates, the cleaning liquid is sprayed into the tank 1, working in conjunction with the cleaning frame 7 to clean the tank 1, thus improving the cleaning efficiency.

[0032] Combination Figure 2 and Figure 4As shown, the drive assembly includes a fixed frame 4, which is fixedly connected to the top of the tank 1. A motor 5 is fixedly connected to the fixed frame 4. The rotating shaft of the motor 5 passes through the top surface of the fixed frame 4 and is fixedly connected to the rotating shaft 6. When working, the motor 5 is started, so that the rotating shaft of the motor 5 can drive the rotating shaft 6 to rotate, thereby driving the cleaning frame 7 to rotate.

[0033] Combination Figure 7 and Figure 8 As shown, the filtration assembly includes a filter box 17, which is fixedly connected to the top of the tank 1. A container box 18 is fixedly connected inside the filter box 17. The container box 18 is hollow and contains activated carbon. During operation, after the steam enters the container box 18, the medicinal components in the steam are adsorbed by the activated carbon, which helps to improve the purity of the steam. The filtered steam enters the exhaust pipe 3 and then enters the next stage tank 1.

[0034] Combination Figure 4 , Figure 5 and Figure 6 As shown, the liquid supply assembly includes a cylindrical cover 12, multiple through holes 8, and a first flow channel 9. The cylindrical cover 12 is fixedly connected to the top of the tank 1 and is rotatably connected to the rotating shaft 6. The multiple through holes 8 are opened through the upper side wall of the rotating shaft 6. The first flow channel 9 is located inside the rotating shaft 6. A second flow channel 10 is opened inside the cleaning frame 7 and is connected to the first flow channel 9. Multiple nozzles 11 are evenly and equidistantly fixedly connected to the side wall of the cleaning frame 7. Each nozzle 11 is fixedly connected to a one-way valve. A striking element is provided inside the second flow channel 10 to strike the cleaning frame 7. A liquid supply component is provided on one side of the cylindrical cover 12. During operation, during the concentration of the liquid, the motor 5 drives the rotating shaft 6 and the cleaning frame 7 to rotate. The cleaning frame 7 cleans the liquid on the inner wall of the tank 1. During the rotation of the cleaning frame 7, the liquid supply component... The filtered steam is transported to the rotating shaft 6 and sprayed at an angle onto the inner wall of the tank 1 through the nozzle 11 of the cleaning frame 7. On the one hand, the high-temperature steam sprayed helps to enhance the cleaning effect of the medicine on the inner wall of the tank 1 in conjunction with the cleaning frame 7. On the other hand, since the nozzle 11 is tilted downward, the direction of the sprayed steam is also tilted downward, which helps to blow the medicine cleaned from the inner wall of the tank 1 downward, which helps to promote the medicine on the inner wall of the tank 1 to flow downward into the medicine in the tank 1, and helps to reduce the waste of medicine residue. After the medicine is concentrated, when it is necessary to clean the inner wall of the tank 1, the liquid supply device is controlled to supply cleaning liquid to the rotating shaft 6. The cleaning liquid is sprayed out from the nozzle 11 to clean the inner wall of the tank 1. At the same time, the one-way valve helps to prevent the medicine in the tank 1 from entering the flow channel 2 10.

[0035] Combination Figure 4 and Figure 6As shown, the liquid supply unit includes a water pump 13, which is fixedly connected to the top of the tank 1. A three-way valve 14 is fixedly connected to the outlet of the water pump 13. Water pipe 15 and water pipe 2 16 are fixedly connected to both sides of the three-way valve 14, respectively. The end of water pipe 15 away from the three-way valve 14 is fixedly connected to the cylindrical cover 12, and the end of water pipe 2 16 away from the three-way valve 14 is fixedly connected to the vent pipe 3. During operation, when high-temperature steam needs to be introduced into the rotating shaft 6 during the concentration of the liquid, the three-way valve 14 can be controlled to connect water pipe 15 and water pipe 2 16. After filtration by the filter box 17 and the container box 18, some of the high-temperature steam will sequentially pass through the second water pipe 16, the three-way valve 14, the first water pipe 15, the cylindrical cover 12, the rotating shaft 6, and the cleaning frame 7, and be sprayed from the nozzle 11 onto the inner wall of the tank 1. This helps to promote the cleaning of the liquid from the inner wall of the tank 1 and to flow to the lower part of the tank 1. During the cleaning process of the tank 1, the three-way valve 14 is controlled to connect the first water pipe 15 with the water pump 13, so that the water pump can pump in the cleaning liquid. The cleaning liquid is finally sprayed from the nozzle 11 onto the inner wall of the tank 1, which is beneficial to the cleaning of the tank 1.

[0036] Combination Figure 5 As shown, the striking component includes multiple support shafts 25, which are rotatably connected to the inner wall of the second flow channel 10. Four rotating plates 26 are fixedly connected to each of the support shafts 25, and striking blocks 27 are fixedly connected to the ends of the four rotating plates 26 via rubber strips. During operation, as steam passes through the second flow channel 10 and is ejected from the nozzle 11, the steam drives the rotating plates 26 to rotate around the support shafts 25, causing the striking blocks 27 to repeatedly strike the inner wall of the second flow channel 10. This causes the cleaning frame 7 to vibrate, which helps the liquid on the cleaning frame 7 to slide into the tank 1 during the concentration process, reducing residual liquid on the cleaning frame 7. Simultaneously, the vibration also helps to coordinate with the cleaning frame 7 in stirring the liquid in the tank 1, promoting the concentration efficiency of the liquid.

[0037] Combination Figure 5 and Figure 6As shown, a groove 701 is provided on the top surface of the cleaning frame 7. A lifting block 19 is slidably connected in the groove 701. A guide is provided on the top of the lifting block 19 to press the lifting block 19 downward. A supporting member is provided on the bottom of the lifting block 19 to elastically support the lifting block 19. During operation, the distance from the center of the groove 701 to the center of the rotating shaft 6 is the same as the distance from the air outlet 101 to the center of the rotating shaft 6. As the rotating shaft 6 drives the cleaning frame 7 to rotate, the supporting member elastically supports upward. The lifting block 19 contacts the inner top wall of the tank 1, which is beneficial for the lifting block 19 to work with the cleaning frame 7 to clean the liquid medicine on the inner top wall of the tank 1. When the lifting block 19 rotates and approaches the vent 101, the guide pushes the lifting block 19 down, causing the lifting block 19 to separate from the inner top wall of the tank 1. This helps to prevent the lifting block 19 from scraping the liquid medicine at the vent 101 into the vent 101, and helps to reduce the amount of liquid medicine entering the vent 101 and the container 18.

[0038] Combination Figure 6 and Figure 7 As shown, the top support includes four mounting slots 20, which are located at the corners of the groove 701. Each of the four mounting slots 20 is slidably connected to a guide frame 21. The top of the guide frame 21 passes through the top of the mounting slot 20 and is fixedly connected to the bottom of the lifting block 19. A spring 22 is sleeved on the lower part of the guide frame 21, and the bottom of the spring 22 is fixedly connected to the bottom surface of the mounting slot 20. During operation, the spring 22 pushes the guide frame 21 upward, causing the guide frame 21 to push the lifting block 19 upward to abut against the inner top wall of the tank 1.

[0039] Combination Figure 6 As shown, the guide includes two inclined grooves 23 and two guide blocks 24. The two inclined grooves 23 are opened on the top surface of the lifting block 19, and the two guide blocks 24 are fixedly connected to both sides of the air outlet 101. The ends of the two guide blocks 24 are provided with guide surfaces. During operation, when the cleaning frame 7 rotates and drives the lifting block 19 to approach the air outlet 101, the inclined grooves 23 contact the guide surfaces of the guide blocks 24, and the inclined grooves 23 are squeezed, causing the lifting block 19 to move downward and the lifting block 19 to disengage from the top inner wall of the tank 1.

[0040] Working principle: When concentrating traditional Chinese medicine liquid, the liquid to be concentrated is placed in tank 1, with the liquid level below the height of steam pipe 2. High-temperature steam is then supplied into tank 1 through steam pipe 2 to concentrate the traditional Chinese medicine liquid in tank 1. During the concentration process, the water in the liquid evaporates to form steam. The steam enters the container 18 through the vent 101. The medicinal components in the steam are adsorbed by activated carbon, which helps to improve the purity of the steam and prevents the vent pipe 3 from being contaminated. The filtered steam enters the vent pipe 3 and then enters the next stage tank 1.

[0041] During the concentration of the medicine solution, the motor 5 is started, which enables the rotating shaft of the motor 5 to drive the rotating shaft 6 to rotate, thereby driving the cleaning frame 7 to rotate. During the rotation of the cleaning frame 7, on the one hand, the medicine solution components on the inner wall of the tank 1 are removed, and on the other hand, the medicine solution is stirred during the rotation of the cleaning frame 7, which helps to improve the evaporation efficiency of water in the medicine solution, and thus helps to improve the concentration efficiency of the medicine solution.

[0042] During the concentration of the medicine, as the cleaning frame 7 rotates, the three-way valve 14 can be controlled to connect water pipe 15 and water pipe 2 16. After being filtered by the filter box 17 and the container box 18, some of the high-temperature steam will sequentially pass through water pipe 2 16, three-way valve 14, water pipe 15, cylindrical cover 12, rotating shaft 6 and cleaning frame 7 and be sprayed from nozzle 11 onto the inner wall of tank 1. On the one hand, the sprayed high-temperature steam helps to increase the cleaning effect of the medicine on the inner wall of tank 1 in conjunction with the cleaning frame 7. On the other hand, since the nozzle 11 is tilted downward, the direction of the sprayed steam is also tilted downward, which helps to blow the medicine cleaned from the inner wall of tank 1 downward. By promoting the downward flow of the medicine into the medicine in tank 1, it helps to reduce the waste of medicine residue.

[0043] During the concentration of the medicine, as the cleaning rack 7 rotates, when the lifting block 19 rotates close to the vent 101, the guide pushes the lifting block 19 downward, causing the lifting block 19 to detach from the top inner wall of the tank 1. This helps to prevent the lifting block 19 from scraping the medicine at the vent 101 into the vent 101, and helps to reduce the amount of medicine entering the vent 101 and the container 18.

[0044] After the drug solution is concentrated, during the cleaning process of tank 1, the drive component drives the rotating shaft 6 and the cleaning frame 7 to rotate. The liquid supply component provides cleaning liquid to the rotating shaft 6 and the cleaning frame 7. During the rotation of the cleaning frame 7, the cleaning liquid is sprayed into the tank 1, which, together with the cleaning frame 7, cleans the tank 1 and helps to improve the cleaning efficiency of the tank 1.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual-effect concentrator for traditional Chinese medicine, characterized in that: The utility model provides a steam cleaning device, including the tank body (1), the upper side wall of tank body (1) is fixedly connected with steam pipe (2), the top center of tank body (1) is rotatably connected with rotating shaft (6), the bottom of rotating shaft (6) is fixedly connected with cleaning frame (7), the top of tank body (1) is provided with drive assembly, drive assembly is used to drive rotating shaft (6) and carries out rotation, the top of tank body (1) is opened with gas outlet (101), the place of gas outlet (101) is provided with filter assembly, filter assembly is fixedly connected with gas outlet pipe (3) on, the top of tank body (1) is provided with liquid supply assembly, The top surface of cleaning frame (7) is opened with recess (701), the recess (701) is slidably connected with lifting block (19), the top of lifting block (19) is provided with guide piece, guide piece is used to press lifting block (19) downward, the bottom of lifting block (19) is provided with top holding piece, top holding piece is used to elastically hold lifting block (19), The top holding piece includes four mounting grooves (20), four mounting grooves (20) are opened in the corner of recess (701), four mounting grooves (20) are slidably connected with guide frame (21) in, the top of guide frame (21) penetrates the top of mounting groove (20) and is fixedly connected at the bottom of lifting block (19) after, the lower part of guide frame (21) is sleeved with spring (22), the bottom of spring (22) is fixedly connected on the bottom surface of mounting groove (20), The guide piece includes two guide blocks (24), two guide blocks (24) are fixedly connected on the both sides of gas outlet (101), and the end of two guide blocks (24) is provided with a guide surface. The guide piece also includes two inclined grooves (23), two inclined grooves (23) are opened on the top surface of lifting block (19).

2. The dual-effect concentrator for traditional Chinese medicine according to claim 1, characterized in that: The drive assembly includes fixed frame (4), fixed frame (4) is fixedly connected on the top of tank body (1), motor (5) is fixedly connected on fixed frame (4), and the rotating shaft of motor (5) penetrates the top surface of fixed frame (4) and is fixedly connected with rotating shaft (6) after.

3. The dual-effect concentrator for traditional Chinese medicine according to claim 2, characterized in that: The filter assembly includes filter box (17), filter box (17) is fixedly connected on the top of tank body (1), and holding box (18) is fixedly connected in filter box (17), holding box (18) is hollow, and activated carbon is contained in holding box (18).

4. The dual-effect concentrator for traditional Chinese medicine according to claim 3, characterized in that: The liquid supply assembly comprises a cylindrical cover (12), a plurality of through holes (8) and a flow channel I (9), the cylindrical cover (12) is fixedly connected to the top of the tank body (1), and the cylindrical cover (12) is rotatably connected with the rotating shaft (6), a plurality of through holes (8) are formed through the upper side wall of the rotating shaft (6), the flow channel I (9) is arranged in the rotating shaft (6), the cleaning frame (7) is provided with a flow channel II (10), the flow channel II (10) is communicated with the flow channel I (9), a plurality of spray heads (11) are fixedly connected to the side wall of the cleaning frame (7) at equal intervals, a one-way valve is fixedly connected in each of the plurality of spray heads (11), a knocking piece is arranged in the flow channel II (10), the knocking piece is used to knock the cleaning frame (7), and one side of the cylindrical cover (12) is provided with a liquid supply piece.

5. The dual-effect concentrator for traditional Chinese medicine according to claim 4, characterized in that: The liquid supply piece comprises a water pump (13), the water pump (13) is fixedly connected to the top of the tank body (1), a three-way valve (14) is fixedly connected to the water outlet end of the water pump (13), water pipes I (15) and water pipes II (16) are fixedly connected to the two sides of the three-way valve (14), respectively, one end of the water pipe I (15) away from the three-way valve (14) is fixedly connected with the cylindrical cover (12), and one end of the water pipe II (16) away from the three-way valve (14) is fixedly connected with the air outlet pipe (3).

6. The dual-effect concentrator for traditional Chinese medicine according to claim 5, characterized in that: The knocking piece comprises a plurality of support shafts (25), the plurality of support shafts (25) are rotatably connected to the inner wall of the flow channel II (10), four rotating plates (26) are fixedly connected to each of the plurality of support shafts (25), and knocking blocks (27) are fixedly connected to the end portions of the four rotating plates (26) through rubber strips.

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