A rare earth extraction VOC treatment device for rare earth hydrometallurgy

Abstract

The application discloses a rare earth extraction VOC treatment device for rare earth hydrometallurgy, and relates to the technical field of VOC treatment, which comprises a bottom plate, a support installed on the bottom plate, an air inlet cylinder fixedly connected to the support, and a treatment cylinder connected to the bottom of the air inlet cylinder; a filtering mechanism is arranged in the air inlet cylinder and used for filtering out liquid drops and solid particles contained in VOC; an adsorption mechanism is arranged in the treatment cylinder and used for adsorbing VOC; a separation mechanism is arranged in the treatment cylinder and used for separating and recycling the VOC adsorbed by the adsorption mechanism; a driving assembly is arranged at the bottom of the filtering mechanism and used for driving the filtering mechanism to shake off filter residues and simultaneously driving the separation mechanism to operate; the liquid drops and solid particles in the VOC are removed by the filtering mechanism, the subsequent adsorption effect is guaranteed, the automatic desorption and recycling of the VOC are realized by the linkage desorption mechanism, multiple cavities work alternately and the adsorption accessories need not be frequently replaced, and the efficiency and continuity of the VOC treatment are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of VOC treatment, in particular to a rare earth extraction VOC treatment device for rare earth hydrometallurgy. BACKGROUND

[0002] In the process of rare earth hydrometallurgy, the extraction process is the core link to realize the separation and purification of rare earth elements. Since rare earth extraction needs to be mixed, stirred, emulsified and subsequently separated by organic phase (containing extractant and diluent) and aqueous phase, under the action of turbulence, bubble breaking, interface disturbance and other physical effects, volatile organic compounds (VOC) in the organic phase will be volatilized to form waste gas. Such VOC mainly includes P204, P507 and other extractants and kerosene and other diluents, which not only have irritating odor and toxicity, but also have flammable and explosive risk. If directly discharged, it will cause air pollution and harm the health of operators, and does not meet the requirements of environmental protection regulations such as "Volatile Organic Compounds Unorganized Emission Control Standard" (GB 37822-2019).

[0003] The VOC waste gas generated by rare earth extraction often carries organic phase droplets, aqueous phase droplets and solid particles (such as rare earth ore slag that has not been completely dissolved, equipment wear debris, etc.), which will affect the subsequent VOC treatment efficiency. In the existing treatment technology, the adsorption method is widely used due to its simple operation and low cost, but the traditional adsorption device has the following limitations: first, the filter mechanism is easy to be blocked by droplets and particles, and needs to be frequently stopped for cleaning, affecting the continuity of treatment; second, the adsorption material needs to be replaced manually or desorbed offline after saturation, resulting in low equipment utilization and inability to realize real-time recovery of VOC; third, the filtration, adsorption and desorption systems run independently and need to be driven by multiple sets of power devices, which is high in energy consumption and low in integration, and is difficult to adapt to the working condition requirements of continuous production in rare earth extraction workshop. SUMMARY

[0004] The purpose of the present application is to provide a rare earth extraction VOC treatment device for rare earth hydrometallurgy to solve the problems raised in the background.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a rare earth extraction VOC treatment device for rare earth hydrometallurgy, comprising a bottom plate and a support mounted on the bottom plate, a gas inlet cylinder is fixedly connected to the support, and a treatment cylinder is connected to the bottom of the gas inlet cylinder;

[0006] A filter mechanism is arranged in the gas inlet cylinder, which is used to filter out liquid droplets and solid particles contained in VOC;

[0007] An adsorption mechanism is arranged in the treatment cylinder, which is used to adsorb VOC;

[0008] The processing cylinder is provided with a separation mechanism, which is used for separating and recycling VOC adsorbed by the adsorption mechanism.

[0009] The bottom of the filtering mechanism is provided with a driving assembly, which is used for driving the filtering mechanism to shake off filter residue and driving the separation mechanism to operate.

[0010] Preferably, the filtering mechanism comprises a rotating frame one rotatingly arranged in the air inlet cylinder, and a cylindrical filter screen fixedly connected to the rotating frame one; the upper and lower ends of the rotating frame one are sealingly attached to the inner wall of the air inlet cylinder, the bottom end of the air inlet cylinder is fixedly connected with an air outlet cylinder, and the air outlet cylinder is communicated with the inner cavity of the filter screen.

[0011] Preferably, the driving assembly comprises a shaft body arranged in the air outlet cylinder and rotationally connected with the air outlet cylinder, and the upper end of the shaft body is fixedly connected with the rotating frame one; a fan blade is fixedly connected to the upper end of the shaft body.

[0012] Preferably, the upper part of the air inlet cylinder is provided with a sealing cover, the sealing cover is connected with the air inlet cylinder through bolts on both sides and sealingly attached to the air inlet cylinder; the upper end of the rotating frame one is rotationally connected with a sealing ring, and the sealing ring is sealingly attached to the sealing cover.

[0013] Preferably, the adsorption mechanism comprises a rotating frame two located in the processing cylinder, a plurality of partition plates are fixedly connected to the bottom of the rotating frame two, and the plurality of partition plates are arranged in a circumferential array; a sealing plate one is fixedly connected to the bottom of the rotating frame two, and the sealing plate one is fixedly connected with the bottoms of the plurality of partition plates; an activated carbon plate is fixed between two adjacent partition plates, and the activated carbon plate is sealingly attached to the partition plates, the rotating frame two and the sealing plate one; an air inlet assembly is arranged on the upper part of the rotating frame two, and the air inlet assembly is used for injecting filtered VOC into a cavity composed of the activated carbon plate and two partition plates.

[0014] Preferably, the air inlet assembly comprises a sealing plate two rotationally connected with the rotating frame two, the sealing plate two is sealingly attached to the rotating frame two and the upper parts of the plurality of partition plates; a gas pipe one is fixedly connected to the sealing plate two, and the upper end of the gas pipe one is fixedly connected with the bottom of the air outlet cylinder.

[0015] Preferably, the detachment mechanism includes a collection bucket fixed to the bottom of the processing cylinder; the front of the processing cylinder has an exhaust port with the same shape and size as the activated carbon plate; the processing cylinder is sealed and fitted with the rotating frame two; the partition plate is spiral-shaped and one end of the partition plate is sealed and fitted with the inner wall of the processing cylinder; a cooling box is fixedly connected to the outer surface of the processing cylinder, and a water tank fixed to the bottom plate is provided behind the cooling box; the water tank and the cooling box are connected by two water pipes; a hot air blower is fixedly connected to the upper part of the water tank, and an air pipe two is fixedly connected to the air outlet of the hot air blower; the other end of the air pipe two is fixedly connected to the sealing plate two; a rotating assembly is provided on the rotating frame two, which is used to drive the rotating frame two to rotate when the rotating frame one rotates.

[0016] Preferably, the rotating assembly includes a pulley one fixed to the upper end of the rotating frame two; the bottom end of the shaft is fixedly connected to a pulley two, the diameter of the pulley two is smaller than that of the pulley one, and the pulley one drives the pulley two through a belt.

[0017] Preferably, the two parts of the sealing plate two that connect to the air pipe one and the air pipe two are the air intake part one and the air intake part two, respectively; the central angle corresponding to the air intake part one is equal to the central angle corresponding to the two adjacent partition plates; the central angle corresponding to the air intake part two is twice the central angle corresponding to the air intake part one; the areas of the sealing plate two on the left and right sides of the air intake part one are equal, and the central angle corresponding to a part of one of them is equal to the central angle corresponding to the air intake part one.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention removes droplets and solid particles from VOCs through a filtration mechanism, ensuring the subsequent adsorption effect. At the same time, it uses a linked desorption mechanism to achieve automatic desorption and recovery of VOCs. Multiple cavities work alternately without the need for frequent replacement of adsorption elements, ensuring the high efficiency and continuity of VOC treatment.

[0020] This invention allows the desorbed VOCs to be collected by liquefaction and reused in the extraction process, realizing resource recycling, reducing raw material waste, and the automatic operation design reduces labor costs, significantly saving the production cost of rare earth hydrometallurgy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the disassembled structure of the present invention;

[0024] Figure 4 This is a cross-sectional view of the filtration mechanism in this invention;

[0025] Figure 5 This is a schematic diagram of the disassembled structure of the filtration mechanism in this invention;

[0026] Figure 6 This is a schematic diagram of the disengagement mechanism in this invention;

[0027] Figure 7 This is a schematic diagram of the disassembly structure of the detachment mechanism in this invention;

[0028] Figure 8 This is a schematic diagram of the adsorption mechanism in this invention;

[0029] Figure 9 This is a schematic diagram of the VOC liquefaction and collection principle in this invention;

[0030] Figure 10 This is a schematic diagram of the cavity air intake principle in this invention.

[0031] In the attached diagram, the components represented by each number are as follows:

[0032] 1. Base plate; 2. Bracket; 3. Air inlet; 4. Processing cylinder; 5. Rotating frame one; 6. Filter screen; 7. Exhaust pipe; 8. Shaft; 9. Fan blade; 10. Sealing cover; 11. Sealing ring; 12. Rotating frame two; 13. Divider plate; 14. Sealing plate one; 15. Activated carbon plate; 16. Sealing plate two; 17. Air pipe one; 19. Collection bucket; 20. Cooling box; 21. Water tank; 22. Water pipe; 23. Hot air blower; 24. Air pipe two; 25. Pulley one; 26. Pulley two; 27. Belt; 28. Air inlet one; 29. ​​Air inlet two. Detailed Implementation

[0033] Please see Figures 1-10 The present invention provides a technical solution: a rare earth extraction VOC treatment device for rare earth hydrometallurgy, including a base plate 1 and a bracket 2 installed on the base plate 1, an air inlet cylinder 3 fixedly connected to the bracket 2, and a treatment cylinder 4 connected to the bottom of the air inlet cylinder 3.

[0034] The intake cylinder 3 is equipped with a filter mechanism, which is used to filter out droplets and solid particles contained in VOCs.

[0035] The treatment cylinder 4 is equipped with an adsorption mechanism, which is used to adsorb VOCs.

[0036] The processing cylinder 4 is equipped with a separation mechanism, which is used to separate and recover the VOCs adsorbed by the adsorption mechanism.

[0037] The bottom of the filtration mechanism is equipped with a drive component, which is used to drive the filtration mechanism to throw off the filter residue and drive the disengagement mechanism to run.

[0038] During operation, in the wet rare earth extraction process, due to the physical effects of violent mixing, stirring, bubble bursting and turbulence, the generated VOC waste gas will almost inevitably contain droplets of organic and aqueous phases, as well as solid particles from various sources. When the VOC is introduced into the air inlet 3, the droplets and solid particles in the VOC can be filtered out by the filtration mechanism to facilitate the subsequent adsorption of VOC.

[0039] During filtration, the drive component can be activated to drive the filter component to shake off droplets and solid particles attached to the surface of the filter component, thereby achieving the effect of automatic cleaning of the filter component and improving the filtration effect. At the same time, the drive component is driven to operate independently of the filter component.

[0040] The filtered VOCs are introduced into the treatment cylinder 4, where the adsorption mechanism can fully adsorb the VOCs. The adsorbed gas is then discharged after passing the test.

[0041] While the adsorption mechanism adsorbs VOCs, the desorption mechanism desorbs and liquefies the adsorbed VOCs, and collects the liquefied VOCs for recycling.

[0042] This device can adsorb VOCs and automatically desorb and collect them, achieving the effect of continuous VOC adsorption without frequent replacement of adsorption components. It can also recover VOCs, greatly saving the cost of rare earth extraction.

[0043] See Figures 4-5 As a further embodiment of the present invention, the filtering mechanism includes a rotating frame 5 rotatably disposed inside the air intake cylinder 3, and a cylindrical filter screen 6 is fixedly connected to the rotating frame 5; both the upper and lower ends of the rotating frame 5 are sealed and fitted to the inner wall of the air intake cylinder 3, and an exhaust pipe 7 is fixedly connected to the bottom end of the air intake cylinder 3, and the exhaust pipe 7 is connected to the inner cavity of the filter screen 6.

[0044] The drive assembly includes a shaft 8 disposed inside and rotatably connected to the exhaust pipe 7, the upper end of the shaft 8 being fixedly connected to the rotating frame 5; and a fan blade 9 being fixedly connected to the shaft 8.

[0045] During operation, when VOCs are introduced into the intake manifold 3, they pass through the filter screen 6 and enter the exhaust manifold 7. As the VOCs pass through the filter screen 6, the droplets and solid particles they contain are filtered out and adhere to the surface of the filter screen 6. When the VOCs enter the exhaust manifold 7, they drive the fan blades 9 to rotate. The rotation of the fan blades 9 drives the rotating frame 5 to rotate, which in turn drives the filter screen 6 to rotate. When the filter screen 6 rotates, the centrifugal force causes the droplets and solid particles adhering to its surface to be thrown off, thereby achieving the effect of automatically cleaning the filter screen 6. When the VOC flow rate is low and the fan blades 9 cannot be driven, an external motor can be connected to the upper part of the intake manifold 3 to assist the rotation of the rotating frame 5.

[0046] See Figures 4-5 As a further embodiment of the present invention, the upper part of the air intake cylinder 3 is provided with a sealing cover 10, the sealing cover 10 is connected to the air intake cylinder 3 by bolts on both sides and the sealing cover 10 is sealed and fitted with the air intake cylinder 3; the upper end of the rotating frame 5 is rotatably connected with a sealing ring 11, the sealing ring 11 is sealed and fitted with the sealing cover 10.

[0047] During operation, the filter residue on the surface of the filter screen 6 is directly thrown onto the inner wall of the air inlet cylinder 3 when the filter screen 6 rotates. Therefore, when the filter residue on the inner wall of the air inlet cylinder 3 increases, it needs to be cleaned. When it is necessary to clean the filter residue on the cylinder wall of the air inlet cylinder 3, the sealing cover 10 can be removed by unscrewing the bolts on the left and right sides, and then the cylinder wall of the air inlet cylinder 3 can be cleaned.

[0048] See Figures 6-8 , Figure 10 As a further embodiment of the present invention, the adsorption mechanism includes a rotating frame 12 located inside the processing cylinder 4. A plurality of partition plates 13 are fixedly connected to the bottom of the rotating frame 12, and the plurality of partition plates 13 are arranged in a circumferential array. A sealing plate 14 is fixedly connected to the bottom of the rotating frame 12, and the sealing plate 14 is fixedly connected to the bottom of the plurality of partition plates 13. An activated carbon plate 15 is fixed between two adjacent partition plates 13, and the activated carbon plate 15 is sealed and fitted with the partition plates 13, the rotating frame 12, and the sealing plate 14. An air intake assembly is provided on the upper part of the rotating frame 12, which is used to inject the filtered VOC into the cavity formed by the activated carbon plate 15 and the two partition plates 13.

[0049] The air intake assembly includes a sealing plate 16 that is rotatably connected to the rotating frame 12. The sealing plate 16 is sealed and fitted to the rotating frame 12 and the upper part of multiple partition plates 13. An air pipe 17 is fixedly connected to the sealing plate 16, and the upper end of the air pipe 17 is fixedly connected to the bottom of the exhaust pipe 7.

[0050] During operation, the VOCs filtered in the intake manifold 3 enter the exhaust manifold 7. The VOCs then enter the cavity consisting of two adjacent partition plates 13 and an activated carbon plate 15 connected to them along the air pipe 17. After entering the cavity, the VOCs pass through the activated carbon plate 15 and are discharged. As the VOCs pass through the activated carbon plate 15, they are completely absorbed by the activated carbon plate 15.

[0051] See Figures 6-10 As a further embodiment of the present invention, the detachment mechanism includes a collection bucket 19 fixed to the bottom of the processing cylinder 4; the front of the processing cylinder 4 is provided with an exhaust port of the same shape and size as the activated carbon plate 15; the processing cylinder 4 is sealed and fitted with the rotating frame 12; the partition plate 13 is spiral in shape and one end of the partition plate 13 is sealed and fitted with the inner wall of the processing cylinder 4; a cooling box 20 is fixedly connected to the outer surface of the processing cylinder 4, and a water tank 21 fixed to the bottom plate 1 is provided on the rear side of the cooling box 20; the water tank 21 and the cooling box 20 are connected by two water pipes 22; a hot air blower 23 is fixedly connected to the upper part of the water tank 21, and an air pipe 24 is fixedly connected to the air outlet of the hot air blower 23; the other end of the air pipe 24 is fixedly connected to the sealing plate 16; a rotating assembly is provided on the rotating frame 12, which is used to drive the rotating frame 12 to rotate when the rotating frame 5 rotates.

[0052] The rotating assembly includes a pulley 25 fixed to the upper end of the rotating frame 12; a pulley 26 is fixedly connected to the bottom end of the shaft 8, the diameter of the pulley 26 is smaller than that of the pulley 25 and the pulley 25 drives the pulley 26 through the belt 27.

[0053] The two parts of the sealing plate 216 that connect to the air pipe 17 and the air pipe 24 are the air intake 28 and the air intake 29, respectively. The central angle corresponding to the air intake 28 is equal to the central angle corresponding to the two adjacent partition plates 13. The central angle corresponding to the air intake 29 is twice the central angle corresponding to the air intake 28. The areas of the sealing plate 216 located on the left and right sides of the air intake 28 are equal, and the central angle corresponding to one of them is equal to the central angle corresponding to the air intake 28.

[0054] During operation, the shaft 8 rotates, driving the pulley 26 to rotate. The pulley 26 then drives the pulley 25 to rotate via the belt 27. The pulley 25 drives the rotating frame 12 to rotate, which in turn drives multiple partition plates 13 to rotate. Multiple cavities (composed of two adjacent partition plates 13 and activated carbon plates 15) pass through the air inlet 28 one by one. When the exhaust port at the top of the cavity coincides with the air inlet 28, VOCs are introduced into the cavity. Under the continuous rotation of the rotating frame 12, the multiple cavities sequentially receive and adsorb VOCs.

[0055] When the rotating frame 12 drives one of the cavities to detach from the air inlet 28 and seal with the sealing plate 16, the upper part of the cavity is sealed, and VOCs no longer enter the cavity. As the rotating frame 12 continues to rotate, the cavity begins to rotate to the position where it connects with the air inlet 29. At this time, the hot air generated by the hot air blower 23 is gradually injected into the cavity through the air pipe 24 and the air inlet 29. After entering the cavity, the hot air passes through the activated carbon plate 15. The activated carbon plate 15 is heated by the hot air, and the VOCs adsorbed on its surface begin to desorb and are carried out by the hot air and blown onto the inner wall of the treatment cylinder 4. Since the water tank 21 continuously circulates cold water to the cooling tank 20 through the water pipe 22, the cooling tank 20 can ensure that the inner wall of the treatment cylinder 4 is always at a low temperature. The high-temperature VOCs will condense and liquefy on the inner wall of the treatment cylinder 4 after they come into contact with the low-temperature inner wall of the treatment cylinder 4.

[0056] Since the separator 13 is spiral-shaped, as the rotating frame 12 drives the separator 13 to rotate, the outer end of the separator 13 will continuously scrape the VOC liquefied on the inner wall of the treatment cylinder 4 downward into the collection tank 19, thereby achieving the effect of automatic VOC collection.

[0057] Since the diameter of pulley 26 is smaller than that of pulley 25, the rotation speed of the rotating frame 12 driven by pulley 25 is lower. This allows the cavity to be connected to the air inlet 28 and air inlet 29 for a longer period of time, ensuring that each activated carbon plate 15 can adsorb for a certain period of time. Since the central angle of the air inlet 29 is larger than that of the air inlet 28, the cavity receives hot air for a longer period of time than it receives VOCs. This ensures that the hot air can fully desorb the VOCs adsorbed on the activated carbon.

Claims

1. A rare earth extraction VOC treatment device for rare earth hydrometallurgical processing, comprising a base plate (1) and a support (2) mounted on the base plate (1), characterized in that: An air inlet cylinder (3) is fixedly connected to the bracket (2), and a processing cylinder (4) is connected to the bottom of the air inlet cylinder (3). The air intake cylinder (3) is equipped with a filter mechanism, which is used to filter out droplets and solid particles contained in VOCs. The processing cylinder (4) is equipped with an adsorption mechanism, which is used to adsorb VOCs; The processing cylinder (4) is equipped with a detachment mechanism, which is used to detach and recover the VOCs adsorbed by the adsorption mechanism; The bottom of the filtration mechanism is equipped with a drive component, which is used to drive the filtration mechanism to throw off the filter residue and drive the disengagement mechanism to run. The filtration mechanism includes a rotating frame (5) rotatably disposed inside the air inlet cylinder (3), and a cylindrical filter screen (6) is fixedly connected to the rotating frame (5); the upper and lower ends of the rotating frame (5) are sealed and fitted to the inner wall of the air inlet cylinder (3), and an exhaust pipe (7) is fixedly connected to the bottom end of the air inlet cylinder (3), and the exhaust pipe (7) is connected to the inner cavity of the filter screen (6); The adsorption mechanism includes a rotating frame two (12) located inside the processing cylinder (4). The bottom of the rotating frame two (12) is fixedly connected to multiple partition plates (13), which are arranged in a circular array. The bottom of the rotating frame two (12) is fixedly connected to a sealing plate one (14), which is fixedly connected to the bottom of the multiple partition plates (13). An activated carbon plate (15) is fixed between two adjacent partition plates (13), and the activated carbon plate (15) is sealed and fitted with the partition plates (13), the rotating frame two (12), and the sealing plate one (14). An air intake assembly is provided on the upper part of the rotating frame two (12), which is used to inject the filtered VOC into the cavity formed by the activated carbon plate (15) and the two partition plates (13). The air intake assembly includes a sealing plate two (16) rotatably connected to the rotating frame two (12), the sealing plate two (16) is sealed and fitted to the upper part of the rotating frame two (12) and multiple partition plates (13); an air pipe one (17) is fixedly connected to the sealing plate two (16), and the upper end of the air pipe one (17) is fixedly connected to the bottom of the exhaust pipe (7). The detachment mechanism includes a collection bucket (19) fixed to the bottom of the processing cylinder (4); the front of the processing cylinder (4) has an exhaust port with the same shape and size as the activated carbon plate (15); the processing cylinder (4) is sealed and fitted with the rotating frame (12); the partition plate (13) is spiral in shape and one end of the partition plate (13) is sealed and fitted with the inner wall of the processing cylinder (4); a cooling box (20) is fixedly connected to the outer surface of the processing cylinder (4), and the rear side of the cooling box (20) is provided with a bottom plate ( 1) A fixed water tank (21) is connected to a cooling tank (20) by two water pipes (22); a hot air blower (23) is fixedly connected to the upper part of the water tank (21), and an air pipe (24) is fixedly connected to the air outlet of the hot air blower (23), and the other end of the air pipe (24) is fixedly connected to a sealing plate (16); a rotating assembly is provided on the rotating frame (12), and the rotating assembly is used to drive the rotating frame (12) to rotate when the rotating frame (5) rotates; The two parts of the sealing plate 2 (16) connected to the air pipe 1 (17) and the air pipe 2 (24) are the air inlet 1 (28) and the air inlet 2 (29), respectively; the central angle corresponding to the air inlet 1 (28) is equal to the central angle corresponding to the two adjacent partition plates (13); The central angle of the second air intake (29) is twice that of the central angle of the first air intake (28); the area of ​​the sealing plate (16) located on the left and right sides of the first air intake (28) is equal and the central angle of a part of it is equal to that of the first air intake (28).

2. The rare earth extraction VOC treatment device for rare earth hydrometallurgy according to claim 1, characterized in that: The drive assembly includes a shaft (8) disposed inside the exhaust pipe (7) and rotatably connected to the exhaust pipe (7), the upper end of the shaft (8) being fixedly connected to the rotating frame (5); and a fan blade (9) being fixedly connected to the shaft (8).

3. The rare earth extraction VOC treatment device for rare earth hydrometallurgy according to claim 1, characterized in that: The upper part of the air inlet cylinder (3) is provided with a sealing cover (10). The sealing cover (10) is connected to the air inlet cylinder (3) by bolts on both sides and the sealing cover (10) is sealed and fitted with the air inlet cylinder (3). The upper end of the rotating frame (5) is rotatably connected with a sealing ring (11), and the sealing ring (11) is sealed and fitted with the sealing cover (10).

4. The rare earth extraction VOC treatment device for rare earth hydrometallurgy according to claim 2, characterized in that: The rotating assembly includes a pulley 1 (25) fixed to the upper end of the rotating frame 2 (12); the bottom end of the shaft (8) is fixedly connected to a pulley 2 (26), the diameter of the pulley 2 (26) is smaller than that of the pulley 1 (25) and the pulley 1 (25) drives the pulley 2 (26) through the belt (27).

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