Chemical feeding device for heating system

Abstract

The utility model discloses a dosing device of heat supply system, including base, the heat supply pipeline of fixed connection in base upper end, the bottom plate of fixed connection in base lateral wall, the first motor of fixed connection in bottom plate upper end, the turntable of fixed connection in first motor output shaft upper end, at least two support blocks of fixed connection in turntable lateral wall, the first slot body of being passed through and being established in the upper end of support block and the filter mechanism of setting in the first slot body, the inlet cylinder is passed through and is fixedly connected with on the heat supply pipeline upper end, is equipped with the valve body on the inlet cylinder. The utility model has quick switching dosing mechanism, conveniently screens out or breaks up the big granule medicament in the medicament, can prevent the big granule medicament that sticks together in the medicament from not fully dissolving in water and adhering in the pipe inner wall.

Description

Technical Field

[0001] This utility model relates to the field of sedimentation tank cleaning technology, specifically to a chemical dosing device for a heating system. Background Technology

[0002] Chinese patent CN210663017U discloses a heating water anti-theft chemical dosing device, which includes a dosing tank installed on the water supply pipeline. The dosing tank has an exhaust port and a feeding trough at its upper end. The exhaust port is threaded and sealed. A manual switch is provided between the feeding trough and the dosing tank. This device, by adding a heating water anti-theft chemical dosing system to the heat exchange station unit, adds an odorant to the heating water in the primary and secondary networks, preventing users from stealing heating water at the end of the pipeline, preventing water loss in the pipeline, saving heating costs, and improving heating quality.

[0003] However, this patent only allows the odorant to be added to the water supply pipeline. When other agents need to be added, it is difficult to quickly switch the dosing mechanism. It is also inconvenient to screen out or crush large particles in the agent. It cannot prevent large particles in the agent from sticking to the inner wall of the pipe without being fully dissolved in water. Further improvements are needed. Utility Model Content

[0004] The purpose of this invention is to provide a dosing device for a heating system, which has the advantages of quick switching of the dosing mechanism and convenient screening or crushing of large particles in the agent, thus solving the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] The dosing device for the heating system includes a base, a heating pipe fixed to the upper end of the base, a base plate fixed to the side wall of the base, a first motor fixed to the upper end of the base plate, a turntable fixed to the upper end of the output shaft of the first motor, at least two support blocks fixed to the side wall of the turntable, a first groove opened through the upper end of the support blocks, and a filter mechanism disposed in the first groove. A feed cylinder is fixedly connected through the upper end of the heating pipe, and a valve body is provided on the feed cylinder.

[0007] A first bracket is fixedly connected to the side wall of the base plate, and a first air blowing mechanism is provided on the first bracket.

[0008] A first fixed cylinder is fixedly connected to the first support. A rotating frame is rotatably installed on the upper side wall of the first fixed cylinder via a bearing. At least two discharge hoppers are fixedly connected through the rotating frame. A second support is fixedly connected to the side wall of the base. A second fixed cylinder is fixedly connected to the second support. The upper end of the second fixed cylinder is in contact with the lower end of the discharge hopper, and the lower end of the second fixed cylinder is in contact with the upper end of the feed cylinder.

[0009] The side wall of the first fixed cylinder is provided with a drive mechanism for rotating the rotating frame;

[0010] The support block is equipped with a second air blowing mechanism that blows air onto the filter mechanism.

[0011] Preferably, the filtration mechanism includes a support ring fixed to the lower part of the inner wall of the first tank, a filter cylinder placed on the upper end of the support ring, a second tank extending through the upper end of the filter cylinder, a filter screen fixed to the inner wall of the second tank, and a vibrating rod fixed to the lower end of the filter screen. A storage battery is fixed to the lower end of the support block, and the storage battery and the vibrating rod are electrically connected. The side wall of the filter cylinder is in contact with the inner wall of the first tank.

[0012] It is worth noting that the filtration mechanism performs basic filtration of the medicine through the filter screen, which can intercept large particulate impurities in the medicine and prevent impurities from entering the heating system and affecting the heating efficiency. The vibrating rod vibrates under the power of the battery, which can effectively prevent the filter screen from being blocked by impurities and ensure continuous filtration. The filter cylinder is placed on the support ring and fits against the inner wall of the first tank, which not only achieves stable support but also reduces the possibility of medicine leaking out from the gaps. At the same time, it is convenient to remove the filter cylinder for cleaning or replacement.

[0013] Preferably, the filtration mechanism includes a hollow sphere rotatably mounted on the inner wall of the first tank, with at least two interconnected third tanks extending through the hollow sphere, and a gap existing between the side wall of the hollow sphere and the inner wall of the first tank.

[0014] It is worth noting that the hollow sphere can rotate within the first tank. When the reagent passes through the third tank, it will be dispersed due to the rotation of the hollow sphere. At the same time, the interconnected structure of different third tanks can form multiple flow filtrations for the reagent, reducing the accumulation of impurities. This structure does not require additional power to drive the filter components (it can rotate by the gravity of the reagent or by a turntable). The structure is simple and not easy to clog, making it suitable for filtering reagents containing various forms of impurities, thus improving the adaptability of filtration.

[0015] Preferably, the second air blowing mechanism includes a first flow channel opened in the support block, a gas supply fixed to the lower end of the support block, a second flow channel opened in the gas supply and an air injection pipe fixed to the gas supply inlet end. The first flow channel and the first tank are interconnected, the air injection pipe and the second flow channel are interconnected, and the second flow channel and the first flow channel are interconnected.

[0016] It is worth noting that the second air-blowing mechanism injects gas through an air injection pipe, which then flows through the second and first flow channels into the first tank, effectively cleaning impurities adhering to the surface of the filter mechanism. The gas acts directly on the filtration area, promptly removing fine impurities remaining in the filter and preventing long-term accumulation that could affect filtration efficiency. Furthermore, cleaning can be performed without disassembling the filter mechanism, extending the service life of the filter components.

[0017] Preferably, an annular groove is formed in the side wall of the support block, the annular groove is interconnected with the first flow channel, the center of the annular groove is coaxially arranged with the center of the first groove, and at least two fourth grooves are formed through the inner wall of the first groove, the fourth grooves are interconnected with the annular groove.

[0018] It is worth noting that the annular groove is interconnected with the first flow channel and is coaxial with the first tank. After the gas enters the annular groove, it can be evenly dispersed and then enter the first tank through multiple fourth tanks. This design allows the air to be blown from multiple directions of the filtration mechanism at the same time, which can realize the blowing of air onto the side wall of the hollow sphere, so that the particles adhering to the side wall of the hollow sphere can fall off quickly, and at the same time, it can also increase the rotation speed of the hollow sphere.

[0019] Preferably, the first air blowing mechanism includes an air pump fixed to the side wall of the first support and an air outlet pipe fixed to the air outlet end of the air pump.

[0020] It is worth noting that the gas generated by the air pump is blown out through the air outlet pipe. By holding the air outlet pipe, air can be blown into the first tank, which can easily blow down the particles adhering to the inner wall of the first tank.

[0021] Preferably, an exhaust hood is threaded onto the exhaust end of the exhaust pipe.

[0022] It is worth noting that the exhaust hood is threaded onto the exhaust pipe. Different exhaust hoods with different apertures and shapes can be replaced according to cleaning needs. When in use, the exhaust hood can be fitted to the first tank, so that the air force blows directly downward into the first tank, which is conducive to the particles in the first tank falling downward.

[0023] Preferably, the drive mechanism includes a bearing plate fixed to the side wall of the first fixed cylinder, a second motor fixed to the upper end of the bearing plate, a gear fixed to the upper end of the output shaft of the second motor, and a gear ring fixed to the lower end of the rotating frame, wherein the gear ring and the gear mesh with each other.

[0024] It is worth noting that the second motor drives the rotating frame to rotate through the meshing of gears and a gear ring. The transmission is stable and highly precise, and it can accurately control the rotation angle of the rotating frame to ensure that the discharge hopper accurately connects with the second fixed cylinder and the feed cylinder, thus avoiding drug leakage. At the same time, the motor drive can realize automated control, reduce manual operation, and improve the operating efficiency of the dosing device.

[0025] Preferably, a limiting post is fixed to the upper end of the turntable, the side wall of the limiting post is in contact with the inner wall of the first fixed cylinder, and the lower end of the first fixed cylinder is in contact with the upper end of the turntable.

[0026] It is worth noting that the side wall of the limiting post is in contact with the inner wall of the first fixed cylinder, and the lower end of the first fixed cylinder is in contact with the upper end of the turntable, which can limit the rotation of the turntable and prevent the turntable from deviating during rotation.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0028] 1. This utility model solves the problem of difficulty in quickly switching the dosing mechanism in the prior art by setting multiple discharge hoppers and driving mechanisms. Multiple discharge hoppers and filtering mechanisms can correspond to different agents. When it is necessary to change the agent, there is no need to disassemble the original parts. The target discharge hopper can be quickly connected to the feed cylinder of the heating pipeline by driving the rotating frame through the driving mechanism. This can ensure the independence of the dosing channels of different agents and can quickly complete the sealing connection when switching. It effectively solves the defects of traditional devices that can only add a single agent and have cumbersome switching operations.

[0029] 2. This utility model solves the problem of large particles in the medicine easily adhering to the pipeline by setting up a filtration mechanism, a first air blowing mechanism, and a second air blowing mechanism. The filtration mechanism can directly intercept or separate large particles of medicine. The filter screen with vibration function can intercept impurities and prevent clogging through vibration. The rotatable hollow ball can separate large particles by dispersing and guiding the flow, or it can crush large particles of medicine. The air blowing mechanism can clean the particles remaining on the filter components and the inner wall of the tank, avoiding the secondary mixing of impurities after accumulation. In addition, the air blowing mechanism can act on the rotating hollow ball, which is conducive to the rotation of the hollow ball, thereby making it easier to blow the particles off the hollow ball. Attached Figure Description

[0030] Figure 1 This is an isometric view of the overall structure of this utility model;

[0031] Figure 2 This is a three-dimensional structural diagram of the limiting post of this utility model;

[0032] Figure 3 This is a three-dimensional structural schematic diagram of the drive mechanism of this utility model;

[0033] Figure 4 This is a cross-sectional view of the first embodiment of the filtration mechanism of this utility model;

[0034] Figure 5 This is a cross-sectional view of the second embodiment of the filtration mechanism of this utility model;

[0035] Figure 6 This is a cross-sectional view of the second air blowing mechanism of this utility model;

[0036] Figure 7 This is a cross-sectional view of the fourth groove of this utility model.

[0037] Reference numerals: 1. Base; 2. Heating pipe; 3. First motor; 4. Turntable; 5. Support block; 6. First tank; 61. Bearing ring; 62. Filter cylinder; 63. Second tank; 64. Filter screen; 65. Vibrator; 66. Battery; 67. Hollow sphere; 68. Third tank; 69. First flow channel; 610. Gas supply; 611. Second flow channel; 612. Gas injection pipe; 613. Annular groove; 614. Fourth tank; 7. First support; 8. Air pump; 9. Gas outlet pipe; 10. Gas outlet hood; 11. First fixed cylinder; 12. Rotating frame; 13. Discharge hopper; 14. Second support; 15. Second fixed cylinder; 16. Feed cylinder; 17. Valve body; 18. Limiting post; 19. Bearing plate; 20. Second motor; 21. Gear; 22. Gear ring. Detailed Implementation

[0038] 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.

[0039] To address the challenges of rapid switching of dosing mechanisms and the inconvenience of screening out large chemical particles in existing heating system dosing devices, which prevent large, clumped chemical particles from adhering to the pipe walls due to incomplete water dissolution, the following technical solution is proposed. Please refer to [link / reference]. Figures 1-7 ;

[0040] The dosing device for the heating system includes a base 1, a heating pipe 2 fixed to the upper end of the base 1, a base plate fixed to the side wall of the base 1, a first motor 3 fixed to the upper end of the base plate, a turntable 4 fixed to the upper end of the output shaft of the first motor 3, at least two support blocks 5 fixed to the side wall of the turntable 4, a first trough 6 through the upper end of the support block 5, and a filter mechanism disposed in the first trough 6. A feed cylinder 16 is fixedly connected through the upper end of the heating pipe 2, and a valve body 17 is provided on the feed cylinder 16.

[0041] A first bracket 7 is fixedly connected to the side wall of the base plate, and a first air blowing mechanism is provided on the first bracket 7.

[0042] A first fixed cylinder 11 is fixedly connected to the first support 7. A rotating frame 12 is rotatably mounted on the upper side wall of the first fixed cylinder 11 via a bearing. At least two discharge hoppers 13 are fixedly connected through the rotating frame 12. A second support 14 is fixedly connected to the side wall of the base 1. A second fixed cylinder 15 is fixedly connected to the second support 14. The upper end of the second fixed cylinder 15 is in contact with the lower end of the discharge hopper 13, and the lower end of the second fixed cylinder 15 is in contact with the upper end of the feed cylinder 16.

[0043] The side wall of the first fixed cylinder 11 is provided with a drive mechanism for rotating the rotating frame 12;

[0044] The support block 5 is equipped with a second air blowing mechanism that blows air onto the filter mechanism.

[0045] Example 1: In this example, the specific filter mechanism includes a support ring 61 fixed to the lower part of the inner wall of the first tank 6, a filter cylinder 62 placed on the upper end of the support ring 61, a second tank 63 that passes through the upper end of the filter cylinder 62, a filter screen 64 fixed to the inner wall of the second tank 63, and a vibrating rod 65 fixed to the lower end of the filter screen 64. A storage battery 66 is fixed to the lower end of the support block 5. The storage battery 66 and the vibrating rod 65 are electrically connected. The side wall of the filter cylinder 62 is in contact with the inner wall of the first tank 6.

[0046] Example 2: In this example, the specific filter mechanism includes a hollow ball 67 rotatably mounted on the inner wall of the first tank 6. At least two interconnected third tanks 68 are provided through the hollow ball 67. There is a gap between the side wall of the hollow ball 67 and the inner wall of the first tank 6.

[0047] In this embodiment, specifically: the second air blowing mechanism includes a first flow channel 69 opened in the support block 5, a gas supply 610 fixed to the lower end of the support block 5, a second flow channel 611 opened in the gas supply 610, and an air injection pipe 612 fixed to the air inlet end of the gas supply 610. The first flow channel 69 and the first tank 6 are interconnected, the air injection pipe 612 and the second flow channel 611 are interconnected, and the second flow channel 611 and the first flow channel 69 are interconnected.

[0048] In this embodiment, specifically: an annular groove 613 is provided in the side wall of the support block 5, the annular groove 613 is interconnected with the first flow channel 69, the center of the annular groove 613 is coaxially arranged with the center of the first groove body 6, and at least two fourth groove bodies 614 are provided through the inner wall of the first groove body 6, the fourth groove bodies 614 are interconnected with the annular groove 613.

[0049] In this embodiment, specifically: the first air blowing mechanism includes an air pump 8 fixed to the side wall of the first bracket 7 and an air outlet pipe 9 fixed to the air outlet end of the air pump 8. The air outlet end of the air outlet pipe 9 can be threadedly installed to the air inlet end of the air injection pipe 612 to supply air to the second air blowing mechanism.

[0050] In this embodiment, specifically: an air hood 10 is threadedly installed on the air outlet end of the air outlet pipe 9.

[0051] In this embodiment, specifically: the driving mechanism includes a bearing plate 19 fixed to the side wall of the first fixed cylinder 11, a second motor 20 fixed to the upper end of the bearing plate 19, a gear 21 fixed to the upper end of the output shaft of the second motor 20, and a gear ring 22 fixed to the lower end of the rotating frame 12, wherein the gear ring 22 and the gear 21 mesh with each other.

[0052] In this embodiment, specifically: the upper end of the turntable 4 is fixedly connected to a limiting post 18, the side wall of the limiting post 18 is in contact with the inner wall of the first fixing cylinder 11, and the lower end of the first fixing cylinder 11 is in contact with the upper end of the turntable 4.

[0053] Working principle: First, the first motor 3 is turned on, and its output shaft drives the turntable 4 to rotate. The turntable 4 drives the support block 5 to rotate synchronously until the first trough 6 corresponds to the second fixed cylinder 15. At the same time, the drive mechanism is turned on, and the output shaft of the second motor 20 on the bearing plate 19 drives the gear 21 to rotate. The gear 21 meshes with the drive gear ring 22, and the gear ring 22 drives the rotating frame 12 to rotate on the first fixed cylinder 11, so that the discharge hopper 13 on the rotating frame 12 corresponds to the second fixed cylinder 15. At this time, the first trough 6, the discharge hopper 13, the second fixed cylinder 15 and the feed cylinder 16 form a continuous channel.

[0054] The agent is added from the discharge hopper 13. The agent will first fall into the second fixed cylinder 15, and then enter the first tank 6 through the second fixed cylinder 15. The agent is processed by the filtration mechanism in the first tank 6.

[0055] If the filtration mechanism is the filter cylinder 62 structure in Example 1, the medicine falls onto the upper end of the filter screen 64 through the second tank 63 and is filtered through the filter screen 64. The vibration of the vibrating rod 65 can accelerate the filtration. During this process, the storage battery 66 supplies power to the vibrating rod 65.

[0056] If the filtration mechanism is the hollow sphere 67 structure as in Example 2, the agent falls on the side wall of the hollow sphere 67 and will rotate due to the impact of gravity. When the agent passes through the third tank 68, the rotation of the hollow sphere 67 will break up some of the agglomerated agent, thereby preventing large particles of agent from falling directly into the heating pipe 2, which can improve the mixing effect of the agent and the water. The gap between the hollow sphere 67 and the inner wall of the first tank 6 can assist in screening.

[0057] During this period, the second blowing mechanism is activated. The gas input through the gas injection pipe 612 enters the first flow channel 69 through the second flow channel 611 in the gas supply 610, and then blows to the filter mechanism through the annular groove 613 and the fourth groove 614, which can prevent blockage around the hollow ball 67.

[0058] Meanwhile, the first air blowing mechanism on the first support 7 can work together. The gas generated by the air pump 8 of the first air blowing mechanism is blown out through the air outlet pipe 9. By holding the air outlet pipe 9, air can be blown into the first tank 6, which is convenient for blowing down the particles adhering to the inner wall of the first tank 6. The air outlet end of the air outlet pipe 9 can be threaded with an air outlet cover 10. Different aperture and shape of air outlet cover 10 can be replaced according to cleaning needs. When in use, the air outlet cover 10 is adapted to the first tank 6 so that the air force blows directly downward into the first tank 6, which is conducive to the particles in the first tank 6 falling down, thereby reducing the residue of the agent in the first tank 6.

[0059] The outlet end of the air outlet pipe 9 can be threaded onto the inlet end of the air injection pipe 612. The gas generated by the air pump 8 of the first blowing mechanism is delivered to the air injection pipe 612 through the air outlet pipe 9 to supply gas to the second blowing mechanism. The gas enters the second flow channel 611 through the air injection pipe 612, and then enters the first flow channel 69 through the second flow channel 611. Since the first flow channel 69 and the first tank 6 are interconnected, the gas is finally blown into the first tank 6, which can prevent blockage in the first tank 6.

[0060] The filtered medicine falls from the first tank 6 into the feed cylinder 16. The valve 17 on the feed cylinder 16 is opened, and the medicine finally enters the heating pipeline 2 through the feed cylinder 16.

[0061] The limiting post 18 fits against the inner wall of the first fixed cylinder 11, which can ensure that the position of the support block 5 is stable when the turntable 4 rotates. The first bracket 7 fixes the air pump 8 and the first fixed cylinder 11, and the second bracket 14 supports the second fixed cylinder 15. The first fixed cylinder 11 and the second fixed cylinder 15 ensure that the medicine is not easily scattered during the delivery process.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0063] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A chemical dosing device for a heating system, characterized in that: It includes a base (1), a heating pipe (2) fixed to the upper end of the base (1), a base plate fixed to the side wall of the base (1), a first motor (3) fixed to the upper end of the base plate, a turntable (4) fixed to the upper end of the output shaft of the first motor (3), at least two support blocks (5) fixed to the side wall of the turntable (4), a first groove (6) opened through the upper end of the support block (5), and a filter mechanism set in the first groove (6). The upper end of the heating pipe (2) is fixedly connected to a feed cylinder (16), and a valve body (17) is provided on the feed cylinder (16). A first bracket (7) is fixed to the side wall of the base plate, and a first air blowing mechanism is provided on the first bracket (7); A first fixed cylinder (11) is fixedly connected to the first support (7). A rotating frame (12) is rotatably installed on the upper side wall of the first fixed cylinder (11) via a bearing. At least two discharge hoppers (13) are fixedly connected through the rotating frame (12). A second support (14) is fixedly connected to the side wall of the base (1). A second fixed cylinder (15) is fixedly connected to the second support (14). The upper end of the second fixed cylinder (15) is in contact with the lower end of the discharge hopper (13), and the lower end of the second fixed cylinder (15) is in contact with the upper end of the feed cylinder (16). The side wall of the first fixed cylinder (11) is provided with a drive mechanism for rotating the rotating frame (12); The support block (5) is equipped with a second air blowing mechanism for blowing air onto the filter mechanism.

2. The dosing device for the heating system according to claim 1, characterized in that: The filtration mechanism includes a support ring (61) fixed to the lower part of the inner wall of the first tank (6), a filter cylinder (62) placed on the upper end of the support ring (61), a second tank (63) that passes through the upper end of the filter cylinder (62), a filter screen (64) fixed to the inner wall of the second tank (63), and a vibrating rod (65) fixed to the lower end of the filter screen (64). A storage battery (66) is fixed to the lower end of the support block (5). The storage battery (66) and the vibrating rod (65) are electrically connected. The side wall of the filter cylinder (62) is in contact with the inner wall of the first tank (6).

3. The dosing device for the heating system according to claim 1, characterized in that: The filtration mechanism includes a hollow ball (67) rotatably mounted on the inner wall of the first tank (6), and at least two interconnected third tanks (68) are provided through the hollow ball (67). There is a gap between the side wall of the hollow ball (67) and the inner wall of the first tank (6).

4. The dosing device for the heating system according to claim 1, characterized in that: The second air blowing mechanism includes a first flow channel (69) opened in the support block (5), a gas supply (610) fixed to the lower end of the support block (5), a second flow channel (611) opened in the gas supply (610), and an air injection pipe (612) fixed to the air inlet end of the gas supply (610). The first flow channel (69) and the first tank (6) are interconnected. The air injection pipe (612) and the second flow channel (611) are interconnected. The second flow channel (611) and the first flow channel (69) are interconnected.

5. The dosing device for the heating system according to claim 4, characterized in that: The side wall of the support block (5) is provided with an annular groove (613), which is connected to the first flow channel (69). The center of the annular groove (613) and the center of the first channel body (6) are coaxially arranged. At least two fourth channels (614) are provided through the inner wall of the first channel body (6), which are connected to the annular groove (613).

6. The dosing device for the heating system according to claim 1, characterized in that: The first air blowing mechanism includes an air pump (8) fixed to the side wall of the first support (7) and an air outlet pipe (9) fixed to the air outlet end of the air pump (8).

7. The dosing device for the heating system according to claim 1, characterized in that: An exhaust hood (10) is threaded onto the exhaust end of the exhaust pipe (9).

8. The dosing device for the heating system according to claim 1, characterized in that: The drive mechanism includes a bearing plate (19) fixed to the side wall of the first fixed cylinder (11), a second motor (20) fixed to the upper end of the bearing plate (19), a gear (21) fixed to the upper end of the output shaft of the second motor (20), and a gear ring (22) fixed to the lower end of the rotating frame (12). The gear ring (22) and the gear (21) mesh with each other.

9. The dosing device for the heating system according to claim 1, characterized in that: The upper end of the turntable (4) is fixedly connected to a limiting post (18), the side wall of the limiting post (18) is in contact with the inner wall of the first fixed cylinder (11), and the lower end of the first fixed cylinder (11) is in contact with the upper end of the turntable (4).

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