Water quality sampling device for a heating system

Abstract

The application discloses a water quality sampling device of a heating system and belongs to the technical field of sampling. The device comprises a pipe body installed between heating pipes, a driving pipe penetrating through the pipe body, a driving element connected to the outside of the driving pipe, a rotating plate fixedly connected to the inner end of the driving pipe, a first sampling pipe capable of rotating relative to the rotating plate and elastically returning and arranged in the rotating plate, the upper end of the first sampling pipe penetrating through the driving pipe, a plurality of first sampling holes and second sampling holes capable of being aligned one by one and equidistantly arranged on the rotating plate and the first sampling pipe, a semicircular plate arranged on one side of the rotating plate, a baffle arranged on the inner wall of the pipe body, a channel arranged in the semicircular plate, a second sampling pipe fixedly connected to the first sampling pipe and in communication with the first sampling pipe, the second sampling pipe being arranged in the channel, and third sampling holes and fourth sampling holes arranged on the lower side of the second sampling pipe and the semicircular plate. The device has the advantages that different flow rates, different radial positions and closed space sampling requirements can be met simultaneously under a single driving source.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sampling, and particularly relates to a water quality sampling device for a heating system. BACKGROUND

[0002] In the operation and maintenance of a heating system, water quality sampling and analysis is a key link to ensure the safe and stable operation of the system. Through the detection of water quality, the content of impurities, corrosive substances, microorganisms and other components in the water can be grasped in a timely manner, and targeted treatment measures can be taken to avoid problems such as pipe blockage and corrosion aggravation.

[0003] At present, the water quality sampling device for a heating system has many deficiencies in actual application. The existing device is difficult to achieve precise sampling of different radial positions in the pipeline at the same time under different flow rates of water flow. Since the flow rate of water flow affects the representativeness of the water sample, the water quality at different radial positions may also differ, which leads to the fact that the water sample obtained by the existing device often cannot fully reflect the real water quality condition in the heating system.

[0004] At the same time, for the sampling needs of a closed space, the existing device usually needs additional structures and operation steps to complete, which is complex and inefficient. In addition, in order to meet the sampling conditions of different flow rates, different radial positions and closed spaces, the sampling device in the prior art mostly needs multiple driving sources and control sources to control the actions of each component, which not only increases the overall structural complexity of the device, increases the manufacturing cost, but also easily leads to a decrease in sampling accuracy due to the coordination problem between multiple control sources, reduces the reliability and stability of the device.

[0005] Therefore, it has become a technical problem to be solved in the current field to develop a water quality sampling device for a heating system that can meet the sampling needs of different flow rates, different radial positions and closed spaces under a single driving source. SUMMARY

[0006] In view of the problems in the prior art, the present application provides a water quality sampling device for a heating system, which has the advantages of being able to meet the sampling needs of different flow rates, different radial positions and closed spaces under a single driving source, and solves the problems of the prior art.

[0007] The application is achieved as follows: a water quality sampling device of a heating system, comprising a pipe body installed between heating pipes, a driving pipe being provided through the pipe body, a driving member being connected to the outside of the driving pipe, a rotating plate being fixedly connected to the inner end of the driving pipe, a first sampling pipe being provided in the rotating plate and being capable of rotating relative to the rotating plate and being elastically reset, the upper end of the first sampling pipe penetrating the driving pipe, a plurality of first sampling holes and second sampling holes being provided on the rotating plate and the first sampling pipe respectively and being capable of being aligned one by one, a semicircular plate being provided on one side of the rotating plate, a baffle being provided on the inner wall of the pipe body, a channel being provided in the semicircular plate, a second sampling pipe being fixedly connected to the first sampling pipe and being in communication, the second sampling pipe being located in the channel, third sampling holes and fourth sampling holes being provided on the lower side of the second sampling pipe and the semicircular plate.

[0008] The arc-shaped edge of the baffle is provided with an arc-shaped slide, the end of the second sampling pipe is slidingly connected to the arc-shaped slide, and when the second sampling pipe touches the end of the arc-shaped slide, the first sampling pipe can be rotated to make the first sampling holes and the second sampling holes staggered.

[0009] As preferred, the edge of the rotating plate is attached with a first sealing layer, the first sealing layer can be attached to the inner wall of the pipe body, the arc-shaped edge of the semicircular plate is provided with a second sealing layer, and the second sealing layer can be attached to the arc-shaped surface of the baffle.

[0010] As preferred, the first sealing layer and the second sealing layer are both rubber airbag structures and are in communication with each other.

[0011] As preferred, the upper half of the rotating plate is provided with a through hole.

[0012] As preferred, the rotating plate is radially provided with a circular groove in communication with the driving pipe, the first sampling holes are provided on the rotating plate and are in communication with the circular groove, and the first sampling holes are inserted into the circular groove; the first sampling pipe is connected to the driving pipe through an elastic member.

[0013] As preferred, the channel is a rectangular channel, the second sampling pipe is a rectangular sampling pipe, and the second sampling pipe can be inclined to the opposite sides of the channel.

[0014] As preferred, the circular groove is a threaded groove, the first sampling pipe is an externally threaded pipe, and the driving pipe is an internally threaded pipe; the first sampling pipe is provided with a spigot, the end of the second sampling pipe is inserted into the spigot; the lower end of the driving pipe is provided with a clamping groove, and the rotating plate is clamped in the clamping groove.

[0015] As preferred, the second sampling holes and the second sampling pipe are respectively located on the opposite sides of the first sampling pipe.

[0016] Preferably, the baffle is fixedly welded to the inner wall of the pipe body; and flanges are fixedly connected to both ends of the pipe body for connecting with pipelines.

[0017] Preferably, the driving member comprises a gear ring, a gear and a motor; the gear ring is fixedly sleeved on the driving pipe, the motor is fixedly connected to the outer surface of the pipe body, and the gear is fixedly connected to the output shaft of the motor and engaged with the gear ring.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1. The device uses only one driving member to drive the driving pipe to rotate as the only power source, so that the switching of different sampling modes and the linkage control of the rotating plate, the first sampling pipe and the second sampling pipe can be realized, without the need to set multiple driving sources and control sources, thereby greatly simplifying the overall structure of the device and reducing the manufacturing cost and maintenance cost. Since a single driving source is used for control, the operator only needs to control the rotation of the driving member to complete the switching of different sampling states, without the need to manipulate multiple components respectively, thereby simplifying the operation process, improving the sampling efficiency, and being especially suitable for a heating system that needs to frequently sample water quality.

[0020] 2. The device can sample different radial positions inside the pipe body under different flow rates of water flow, so that the obtained water samples can more comprehensively reflect the real water quality conditions in the heating system, thereby providing a reliable sample basis for water quality analysis. Not only can the device realize sampling of different flow rates and different radial positions in a non-closed space, but also can complete sampling in a closed space, thereby meeting the needs of multiple sampling scenarios in the heating system and improving the adaptability and practicality of the device.

[0021] 3. The action switching is realized through mechanical linkage between components, thereby reducing the use of electronic control elements, lowering the risk of device failure caused by electronic element failure, avoiding the coordination problem between multiple control sources, and improving the operation reliability and stability of the device. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective structural schematic view of the water quality sampling device for the heating system provided in Embodiment 1 of the present application;

[0023] Figure 2 is an enlarged structural schematic view of part A in Figure 1

[0024] Figure 3 is a top view structural schematic view of the water quality sampling device for the heating system provided in Embodiment 1 of the present application;

[0025] Figure 4 ​is the structural schematic diagram of the B-B part in Figure 3

[0026] Figure 5 is the structural schematic diagram of the B-B part in Figure 4

[0027] Figure 6 is the structural schematic diagram of the B-B part in Figure 4

[0028] Figure 7 is the structural schematic diagram of the B-B part in

[0029] Figure 8 is the structural schematic diagram of the B-B part in Figure 7

[0030] Figure 9 is the structural schematic diagram of the B-B part in

[0031] Figure 10 is the structural schematic diagram of the B-B part in

[0032] Figure: 1, pipe body; 2, drive pipe; 3, rotating plate; 4, first sampling pipe; 5, first sampling hole; 6, second sampling hole; 7, semicircular plate; 8, baffle; 9, channel; 10, second sampling pipe; 11, third sampling hole; 12, fourth sampling hole; 13, arc-shaped slide; 14, first sealing layer; 15, second sealing layer; 16, through hole; 17, elastic member; 18, socket; 19, clamping groove; 20, flange. DETAILED DESCRIPTION

[0033] In order to further understand the invention content, characteristics and effects of the present application, the following examples are given, and the detailed description is as follows with reference to the drawings.

[0034] The structure of the present application will be described in detail below with reference to the drawings. Example 1

[0035] As Figures 1 to 9 ​​​​As shown, the water quality sampling device for the heating system provided by the embodiment of the present application comprises a pipe body 1 installed between heating pipes, a driving pipe 2 is provided through the pipe body 1, a driving member is connected to the outside of the driving pipe 2, a rotating plate 3 is fixedly connected to the inner end of the driving pipe 2, a first sampling pipe 4 capable of rotating relative to the rotating plate 3 and elastically returning is arranged in the rotating plate 3, the upper end of the first sampling pipe 4 penetrates the driving pipe 2, a plurality of first sampling holes 5 and second sampling holes 6 capable of being aligned one by one are respectively arranged at equal intervals on the rotating plate 3 and the first sampling pipe 4; a semicircular plate 7 is arranged on one side of the rotating plate 3, a baffle 8 is arranged on the inner wall of the pipe body 1, a channel 9 is arranged in the semicircular plate 7, a second sampling pipe 10 is fixedly connected and communicated with the first sampling pipe 4, the second sampling pipe 10 is located in the channel 9, and third sampling holes 11 and fourth sampling holes 12 are arranged on the lower side of the second sampling pipe 10 and the semicircular plate 7; an arc-shaped sliding way 13 is arranged on the arc-shaped edge of the baffle 8, the end of the second sampling pipe 10 is slidingly connected to the arc-shaped sliding way 13, and when the second sampling pipe 10 touches the end of the arc-shaped sliding way 13, the first sampling pipe 4 can be rotated to make the first sampling holes 5 and the second sampling holes 6 misaligned.

[0036] The water quality sampling device for the heating system drives the driving pipe 2 to rotate by the driving member, switches different sampling modes by the cooperation between the components, and the specific working principle is as follows:

[0037] The first sampling state (non-closed space, different flow rates and radial position sampling): when the driving pipe 2 is driven to rotate by the driving member, the second sampling pipe 10 does not touch the end of the arc-shaped sliding way 13, because the first sampling pipe 4 is elastically connected with the rotating plate 3 and is not driven by external force, the first sampling pipe 4 remains stationary relative to the rotating plate 3, at this time, the plurality of first sampling holes 5 on the rotating plate 3 and the second sampling holes 6 on the first sampling pipe 4 are aligned one by one. At the same time, the second sampling pipe 10 and the third sampling holes 11 and the fourth sampling holes 12 on the lower side of the semicircular plate 7 are misaligned. The water flows in the pipe body 1, and the water samples at different radial positions enter the first sampling pipe 4 through the aligned first sampling holes 5 and second sampling holes 6, so that sampling is realized. Moreover, the rotating plate 3 is rotated to different positions by the driving member driving the driving pipe 2, the water flow in the pipe body 1 changes when passing through the channel 9 of the rotating plate 3, so that the flow rate of the water flow is changed, and then the sampling of the water sample under different flow rates is realized.

[0038] Second sampling state (closed space sampling): when the driving member drives the driving pipe 2 to rotate to the position that the rotating plate 3 blocks the pipe body 1 (the axes of the two are coincident), the rotating plate 3, the baffle 8, the semicircular plate 7 and the inner wall of the pipe body 1 together form a closed water storage space, and at this time the water flow is blocked in the closed space. In the process of rotating the rotating plate 3 to this position, the end of the second sampling pipe 10 slides in the arc-shaped slide 13 and touches the end of the arc-shaped slide 13, and after being extruded, the second sampling pipe 10 is slightly tilted. The tilt of the second sampling pipe 10 drives the first sampling pipe 4 to rotate relative to the rotating plate 3, so that the first sampling hole 5 and the second sampling hole 6 are misaligned, avoiding the water flow in the non-closed space from entering the first sampling pipe 4. At the same time, the tilt of the second sampling pipe 10 aligns the third sampling hole 11 and the fourth sampling hole 12, and the water sample in the closed space enters the second sampling pipe 10 through the aligned third sampling hole 11 and the fourth sampling hole 12, completing the sampling of the closed space.

[0039] Third sampling state (non-sampling state under high flow rate): when the driving member drives the driving pipe 2 to rotate to the position that the second sampling pipe 10 touches the other end of the arc-shaped slide 13 and the axes of the rotating plate 3 and the pipe body 1 are perpendicular, the water flow rate in the pipe body 1 reaches the fastest. At this time, since the second sampling pipe 10 touches the end of the arc-shaped slide 13, the first sampling pipe 4 is driven to rotate by external force, resulting in that the first sampling hole 5 and the second sampling hole 6 are misaligned and cannot be sampled through the first sampling pipe 4, and at the same time, the third sampling hole 11 and the fourth sampling hole 12 are also misaligned, and the device as a whole is in a non-sampling state.

[0040] In addition, since the first sampling pipe 4 is elastically connected with the rotating plate 3, after the external force disappears, the first sampling pipe 4 can be elastically reset. By driving the second sampling pipe 10 to rotate relative to the axis of the first sampling pipe 4, the switching of the first sampling hole 5 and the second sampling hole 6 being communicated or the third sampling hole 11 and the fourth sampling hole 12 being communicated is realized, and this switching process can be completed by only one power source, i.e. driving the driving pipe 2 to rotate by the driving member. The rotating plate 3, the first sampling pipe 4 and the second sampling pipe do not need to be operated respectively.

[0041] Further, the edge of the rotating plate 3 is attached with a first sealing layer 14, the first sealing layer 14 can be attached to the inner wall of the pipe body 1, and the arc-shaped edge of the semicircular plate 7 is provided with a second sealing layer 15, the second sealing layer 15 can be attached to the arc-shaped surface of the baffle 8. The first sealing layer 14 and the second sealing layer 15 are both rubber airbag structures and are in communication with each other.

[0042] Through the arrangement, when the first sealing layer 14 does not press the inner wall of the pipe body 1 (the baffle 8 does not block the pipe body 1), the gas in the first sealing layer 14 cannot enter the second sealing layer 15, at this time, the gas in the second sealing layer 15 is less, and cannot tightly adhere to the arc-shaped edge of the baffle 8, so as not to hinder the rotation of the rotating plate 3. When the first sealing layer 14 presses the inner wall of the pipe body 1 (the sealing between the baffle 8 and the pipe body 1 is realized), the gas in the first sealing layer 14 is pressed into the second sealing layer 15, so as to realize the sealing between the semicircular plate 7 and the baffle 8.

[0043] Specifically, the rotating plate 3 is radially provided with a circular groove communicated with the driving pipe 2, the first sampling hole 5 is arranged on the rotating plate 3 and communicated with the circular groove, and the first sampling hole 5 is inserted into the circular groove; the first sampling pipe 4 is connected to the driving pipe 2 through the elastic member 17 (for example, the first sampling pipe 4 is connected with an elastic sheet, the upper end of the driving pipe 2 is provided with two limiting columns, and the elastic sheet is located between the two limiting columns). The channel 9 is a rectangular channel, the second sampling pipe 10 is a rectangular sampling pipe, and the second sampling pipe 10 can be inclined to the opposite two sides of the channel 9.

[0044] The circular groove is a threaded groove, the first sampling pipe 4 is an externally threaded pipe, and the driving pipe 2 is an internally threaded pipe; the first sampling pipe 4 is provided with a socket 18, and the end of the second sampling pipe 10 is inserted into the socket 18; the lower end of the driving pipe 2 is provided with a clamping groove 19, and the rotating plate 3 is clamped in the clamping groove 19.

[0045] Through the arrangement, the installation and disassembly of components are facilitated. For example, when installing, the rotating plate 3 is first placed into the pipe body 1, then the driving pipe 2 is penetrated through the pipe body 1, the clamping groove 19 clamps the rotating plate 3, then the first sampling pipe 4 is screwed into the driving pipe 2 and the circular groove, so as to complete the connection of the three. It should be noted that, in order to stagger the first sampling hole 5 and the second sampling hole 6, the first sampling pipe 4 is only required to be slightly rotated by 20°-40°, and no obvious up and down movement will be generated during rotation. Moreover, one end of the second sampling pipe 10 is limited by the socket 18, and the other end is limited by the arc-shaped sliding way 13, so that the second sampling pipe 10 cannot be separated from the socket 18, and the two sampling pipes can be conveniently disassembled when disassembling. The second sampling hole 6 and the second sampling pipe 10 are respectively located on the opposite two sides of the first sampling pipe 4.

[0046] Specifically, the baffle 8 is fixedly welded to the inner wall of the pipe body 1; the pipe body 1 is fixedly connected with flanges 20 at both ends, for connecting with a pipeline.

[0047] Further, the driving member comprises a gear ring, a gear wheel and a motor; the gear ring is fixedly sleeved on the driving pipe 2, the motor is fixedly connected to the outer surface of the pipe body 1, the gear wheel is fixedly connected to the output shaft of the motor, and the gear wheel is engaged with the gear ring. The driving member can also only adopt a lever, and the driving pipe 2 is driven to rotate by manual or electric driving. The driving member arranged above is not shown in the drawings, and is well known to those skilled in the art, and thus is not described here. Example 2

[0048] Referring to Figure 10 On the basis of example 1, the following settings are also made:

[0049] The upper half of the rotating plate 3 is provided with a through hole 16. When the lower half of the pipe body 1 forms a closed space, the through hole 16 can still allow water to pass through, so that the flow of water is not hindered when the closed sampling is performed.

[0050] The working principle of the present application is as follows:

[0051] When the driving member drives the driving pipe 2 to rotate, the second sampling pipe 10 does not touch the end of the arc-shaped slide 13, and the first sampling pipe 4 remains stationary relative to the rotating plate 3 because the first sampling pipe 4 is elastically connected to the rotating plate 3 and is not subjected to external force. At this time, the first sampling holes 5 on the rotating plate 3 are aligned with the second sampling holes 6 on the first sampling pipe 4. Meanwhile, the second sampling pipe 10 is out of alignment with the third sampling holes 11 and the fourth sampling holes 12 on the lower side of the semicircular plate 7. The water flow in the pipe body 1 enters the first sampling pipe 4 through the aligned first sampling holes 5 and the second sampling holes 6 at different radial positions, thereby achieving sampling. By driving the driving pipe 2 to rotate the rotating plate 3 to different positions, the water flow in the pipe body 1 changes through the channel 9 of the rotating plate 3, thereby changing the water flow rate and achieving sampling of water samples at different flow rates. When the driving member drives the driving pipe 2 to rotate to the position where the rotating plate 3 blocks the pipe body 1 (the axes of the two are coincident), the rotating plate 3, the baffle 8, the semicircular plate 7, and the inner wall of the pipe body 1 together form a closed water storage space, and the water flow is blocked in the closed space. During the rotation of the rotating plate 3 to this position, the end of the second sampling pipe 10 slides in the arc-shaped slide 13 and touches the end of the arc-shaped slide 13, and is slightly tilted after being squeezed. The tilting of the second sampling pipe 10 drives the first sampling pipe 4 to rotate relative to the rotating plate 3, so that the first sampling holes 5 and the second sampling holes 6 are out of alignment, thereby preventing the water flow outside the closed space from entering the first sampling pipe 4. At the same time, the tilting of the second sampling pipe 10 aligns the third sampling holes 11 and the fourth sampling holes 12, and the water samples in the closed space enter the second sampling pipe 10 through the aligned third sampling holes 11 and the fourth sampling holes 12, thereby completing the sampling of the closed space. When the driving member drives the driving pipe 2 to rotate to the position where the second sampling pipe 10 touches the other end of the arc-shaped slide 13 and the axes of the rotating plate 3 and the pipe body 1 are perpendicular, the water flow in the pipe body 1 reaches the fastest speed. At this time, because the second sampling pipe 10 touches the end of the arc-shaped slide 13, the first sampling pipe 4 is driven to rotate by external force, resulting in that the first sampling holes 5 and the second sampling holes 6 are out of alignment, and the third sampling holes 11 and the fourth sampling holes 12 are also out of alignment, so that the device as a whole is in a non-sampling state.

[0052] It should be noted that, in this document, the terms such as first and second are used merely 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. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such process, method, article or device.

[0053] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A water sampling device for a heating system, comprising a pipe body (1) installed between heating pipelines, characterized in that: A drive tube (2) is provided through the tube body (1). A drive component is connected to the outside of the drive tube (2). A rotating plate (3) is fixedly connected to the inner end of the drive tube (2). A first sampling tube (4) is provided in the rotating plate (3) that can rotate relative to the rotating plate (3) and elastically reset. The upper end of the first sampling tube (4) passes through the drive tube (2). A plurality of first sampling holes (5) and second sampling holes (6) that can be aligned one-to-one are provided on the rotating plate (3) and the first sampling tube (4) respectively. The rotating plate (3) has a semi-circular plate (7) on one side, the tube body (1) has a baffle (8) on the inner wall, the semi-circular plate (7) has a channel (9) inside, the first sampling tube (4) is fixedly connected to and communicates with the second sampling tube (10), the second sampling tube (10) is located in the channel (9), and the second sampling tube (10) and the lower side of the semi-circular plate (7) have a third sampling hole (11) and a fourth sampling hole (12). The baffle (8) has an arc-shaped slide (13) on its arc-shaped edge. The end of the second sampling tube (10) is slidably connected to the arc-shaped slide (13). When the second sampling tube (10) touches the end of the arc-shaped slide (13), it can rotate the first sampling tube (4) so ​​that the first sampling hole (5) and the second sampling hole (6) are misaligned.

2. The water quality sampling device for a heating system as described in claim 1, characterized in that: The edge of the rotating plate (3) is fitted with a first sealing layer (14), which can fit against the inner wall of the tube body (1). The arc edge of the semi-circular plate (7) is provided with a second sealing layer (15), which can fit against the arc surface of the baffle (8).

3. The water quality sampling device for a heating system as described in claim 2, characterized in that: The first sealing layer (14) and the second sealing layer (15) are both rubber airbag structures and are interconnected.

4. The water quality sampling device for a heating system as described in claim 1, characterized in that: The upper half of the rotating plate (3) is provided with a through hole (16).

5. The water quality sampling device for a heating system as described in claim 1, characterized in that: The rotating plate (3) is provided with a circular groove that communicates with the driving tube (2) in the radial direction. The first sampling hole (5) is opened on the rotating plate (3) and communicates with the circular groove. The first sampling hole (5) is inserted into the circular groove. The first sampling tube (4) is connected to the driving tube (2) through an elastic element (17).

6. The water quality sampling device for a heating system as described in claim 5, characterized in that: The channel (9) is a rectangular channel, the second sampling tube (10) is a rectangular sampling tube, and the second sampling tube (10) can be tilted to the opposite sides of the channel (9).

7. The water quality sampling device for a heating system as described in claim 6, characterized in that: The circular groove is a threaded groove, the first sampling tube (4) is an externally threaded tube, and the driving tube (2) is an internally threaded tube; the first sampling tube (4) has an insertion port (18), and the end of the second sampling tube (10) is inserted into the insertion port (18); the lower end of the driving tube (2) has a slot (19), and the rotating plate (3) is engaged in the slot (19).

8. The water quality sampling device for a heating system as described in claim 1, characterized in that: The second sampling hole (6) and the second sampling tube (10) are located on opposite sides of the first sampling tube (4).

9. A water quality sampling device for a heating system as described in claim 1, characterized in that: The baffle (8) is fixedly welded to the inner wall of the pipe body (1); both ends of the pipe body (1) are fixedly connected with flanges (20) for connecting to the pipeline.

10. A water quality sampling device for a heating system as described in claim 1, characterized in that: The driving component includes a gear ring, a gear, and a motor; the gear ring is fixedly sleeved on the driving tube (2), the motor is fixedly connected to the outer surface of the tube body (1), the gear is fixedly connected to the output shaft of the motor, and the gear meshes with the gear ring.

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