Coal drop pipe assembly

Abstract

The utility model relates to a coal drop pipe assembly which comprises a coal drop pipe, a pipe wall cleaning device and a lifting device, and the coal drop pipe comprises a first pipeline extending in the vertical direction; the pipe wall cleaning device is arranged in the first pipeline and comprises a mounting seat, a scraper blade and a rotating mechanism, the mounting seat is annular, the outer circumferential surface of the mounting seat is attached to the inner wall of the first pipeline, an avoiding channel capable of allowing coal to pass through is defined by the inner circumferential surface of the mounting seat, and the rotating mechanism is mounted in the mounting seat; the scraping plate is located below the mounting base and attached to the inner wall of the first pipeline, and the rotating mechanism is connected with the scraping plate and can drive the scraping plate to rotate around the axis of the first pipeline; and the lifting device is mounted on the first pipeline, connected with the mounting seat and used for driving the mounting seat to move along the axis of the first pipeline. And the scraping plate scrapes coal attached to the inner wall of the first pipeline through the rotating mechanism and the lifting device.

Description

Technical Field

[0001] The present disclosure relates to the technical field of coal conveying pipelines, and more particularly, to a coal dropping pipe assembly. Background Art

[0002] The coal dropping pipe is a key component for boiler fuel transportation. Its main function is to guide coal into the boiler by gravity to supplement the fuel supply.

[0003] In related technologies, some coal has high humidity and strong viscosity. When passing through the coal dropping pipe, it is easy to adhere to the inner wall of the coal dropping pipe, resulting in a reduction in the cross-sectional area of the coal passage that the coal dropping pipe can pass through, affecting the fuel supply of the boiler. Over time, it is easy to cause blockage of the coal dropping pipe. Summary of the Utility Model

[0004] The purpose of the present disclosure is to provide a coal dropping pipe assembly that can avoid the phenomenon of blockage of the coal dropping pipe due to coal adhering to the inner wall.

[0005] To achieve the above purpose, the present disclosure provides a coal dropping pipe assembly, which includes a coal dropping pipe, a pipe wall cleaning device, and a lifting device. The coal dropping pipe includes a first pipe extending in the vertical direction. The pipe wall cleaning device is arranged inside the first pipe. The pipe wall cleaning device includes a mounting seat, a scraper, and a rotating mechanism. The mounting seat is formed in a ring shape. The outer peripheral surface of the mounting seat is attached to the inner wall of the first pipe. The inner peripheral surface of the mounting seat defines an avoidance passage through which coal can pass. The rotating mechanism is installed inside the mounting seat. The scraper is located below the mounting seat and is attached to the inner wall of the first pipe. The rotating mechanism is connected to the scraper and can drive the scraper to rotate around the axis of the first pipe. The lifting device is installed on the first pipe. The lifting device is connected to the mounting seat and is used to drive the mounting seat to move along the axis of the first pipe.

[0006] Optionally, the rotating mechanism includes a first motor, a first gear, and a second gear. The first gear is fixed on the output shaft of the first motor and meshes with the second gear. The axis of the second gear is collinear with the axis of the first pipe. The scraper is fixed to the lower end surface of the second gear.

[0007] Optionally, a first installation cavity and a second installation cavity communicating with the first installation cavity are provided in the mounting base. The first motor is installed in the first installation cavity, and the output shaft of the motor extends into the second installation cavity. The first gear and the second gear are both located in the second installation cavity, and the end face of the second gear is rotatably supported on the cavity wall of the second installation cavity. An annular channel communicating with the second installation cavity is formed at the bottom of the mounting base. The pipe wall cleaning device further includes a connecting shaft, one end of the connecting shaft is connected to the lower end face of the second gear, and the other end of the connecting shaft passes through the annular channel and is connected to the scraping plate.

[0008] Optionally, the avoidance channel includes a tapered section, and the diameter of the tapered section gradually decreases along the conveying direction of the coal material in the first pipeline.

[0009] Optionally, there are a plurality of scraping plates, and the plurality of scraping plates are evenly spaced along the circumferential direction of the first pipeline.

[0010] Optionally, the lifting device includes a second motor, a pulling rope, and a protective cover. The second motor is located outside the first pipeline and fixed to the first pipeline. The output shaft of the second motor extends into the first pipeline. The protective cover is located in the first pipeline and covers the outside of the output shaft of the second motor. One end of the pulling rope is wound around the output shaft of the second motor, and the other end of the pulling rope passes through the lower end of the protective cover and is connected to the mounting base.

[0011] Optionally, the top surface of the protective cover is formed as an inclined surface extending obliquely downward.

[0012] Optionally, the coal dropping pipe further includes a second pipeline communicating with the first pipeline. The second pipeline has a bent portion. The coal dropping pipe assembly further includes a coal pushing device. The coal pushing device is located at the bent portion. The coal pushing device includes a telescopic mechanism and a pushing plate. The telescopic mechanism is located outside the second pipeline and fixed to the second pipeline. The pushing plate is located inside the second pipeline and is connected to the telescopic mechanism.

[0013] Optionally, the second pipeline includes a first pipe section and a second pipe section connected to each other. The first pipe section is located between the second pipe section and the first pipeline. The axis of the first pipe section is collinear with the axis of the first pipeline. The axis of the second pipe section is arranged at an angle with the axis of the first pipe section. The connection portion between the first pipe section and the second pipe section constitutes the bent portion. The pushing plate includes a first plate body and a second plate body connected to each other. The first plate body is located inside the first pipe section and is parallel to the axis of the first pipe section. The second plate body is located inside the second pipe section and is parallel to the axis of the second pipe section.

[0014] Optionally, a first elastic member is connected between the first pipe section and the first plate body, and a second elastic member is connected between the second pipe section and the second plate body.

[0015] Through the above technical solution, a pipe wall cleaning device is provided in the first pipe of the coal dropping pipe. The scraper is driven to rotate around the axis of the first pipe by the rotating mechanism, so that the coal material attached to the inner wall of the first pipe at the height where the scraper is located can be scraped off by the scraper. Since the rotating mechanism is installed in the mounting seat, the scraper is connected to the rotating mechanism, and the lifting device can drive the mounting seat and move along the axis of the first pipe. Therefore, the mounting seat can serve as the installation base for the rotating mechanism and the scraper. When the mounting seat moves, it can drive the rotating mechanism and the scraper to move synchronously, so that the scraper can be at different heights, and then the coal material attached to the inner walls of different heights of the first pipe can be scraped off by the scraper, thus avoiding the blockage of the first pipe of the coal dropping pipe.

[0016] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. Brief Description of the Drawings

[0017] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0018] Figure 1 is a front view of a coal dropping pipe assembly provided by an exemplary embodiment of the present disclosure;

[0019] Figure 2 is Figure 1 a sectional view of

[0020] Figure 3 is Figure 2 a partial enlarged view of part A in

[0021] Figure 4 is Figure 2 an installation schematic diagram of the mounting seat, the first gear and the second gear after being sectioned along B-B in

[0022] Description of the Reference Numerals

[0023] 100 - Coal dropping pipe; 110 - First pipe; 120 - Second pipe; 121 - Bend; 122 - First pipe section; 123 - Second pipe section;

[0024] 200 - Pipe wall cleaning device; 210 - Mounting seat; 211 - Avoidance channel; 212 - First installation cavity; 213 - Second installation cavity; 214 - Annular channel; 220 - Scraper; 230 - Rotating mechanism; 231 - First motor; 232 - First gear; 233 - Second gear; 240 - Connecting shaft;

[0025] 300 - Lifting device; 310 - Second motor; 320 - Pulling rope; 330 - Protective cover; 331 - Inclined plane;

[0026] 400 - Coal pushing device, 410 - Telescopic mechanism; 420 - Pushing plate; 421 - First plate body; 422 - Second plate body; 430 - First elastic member; 440 - Second elastic member. Detailed implementation manners

[0027] The following will describe in detail the specific implementation manners of the present disclosure with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for the purpose of illustrating and explaining the present disclosure, and are not used to limit the present disclosure.

[0028] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is defined based on the drawing direction of the accompanying drawings (such as Figures 1-3 ) and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it cannot be understood as a limitation of the present disclosure. In addition, the terms "inner" and "outer" refer to the inside and outside of the corresponding structural contour. In addition, the terms "first", "second", etc. are only used to distinguish one element from another element, and do not have sequence and importance.

[0029] In the description of the present disclosure, it should also be noted that unless otherwise clearly specified and limited, the terms "arranged", "connected", "coupled", "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0030] In view of the fact that the existing coal dropping pipe is prone to blockage due to coal sticking to the pipe wall, the present disclosure provides a coal dropping pipe assembly to solve the technical problem that the existing coal dropping pipe is prone to blockage.

[0031] As Figures 1 to 4, the coal chute assembly includes a coal chute 100, a pipe wall cleaning device 200, and a lifting device 300. The coal chute 100 includes a first pipe 110 extending in the vertical direction, and the pipe wall cleaning device 200 is disposed within the first pipe 110. The pipe wall cleaning device 200 includes a mounting seat 210, a scraper 220, and a rotating mechanism 230. The mounting seat 210 is formed in a ring shape, the outer peripheral surface of the mounting seat 210 is in contact with the inner wall of the first pipe 110, and the inner peripheral surface of the mounting seat 210 defines an avoidance passage 211 through which the coal material can pass. The rotating mechanism 230 is installed within the mounting seat 210. The scraper 220 is located below the mounting seat 210 and is in contact with the inner wall of the first pipe 110. The rotating mechanism 230 is connected to the scraper 220 and can drive the scraper 220 to rotate around the axis of the first pipe 110. The lifting device 300 is installed on the first pipe 110, and the lifting device 300 is connected to the mounting seat 210 and is used to drive the mounting seat 210 to move along the axis of the first pipe 110.

[0032] Through the above technical solution, a pipe wall cleaning device 200 is provided within the first pipe 110 of the coal chute 100. By driving the scraper 220 to rotate around the axis of the first pipe 110 through the rotating mechanism 230, the coal material attached to the inner wall of the first pipe 110 at the height where the scraper 220 is located can be scraped off by the scraper 220. Since the rotating mechanism 230 is installed within the mounting seat 210, the scraper 220 is connected to the rotating mechanism 230, and the lifting device 300 can drive the mounting seat 210 and move along the axis of the first pipe 110. Therefore, the mounting seat 210 can serve as the installation base for the rotating mechanism 230 and the scraper 220. When the mounting seat 210 moves, it can drive the rotating mechanism 230 and the scraper 220 to move synchronously, so that the scraper 220 can be at different heights, and further enable the scraper 220 to scrape the coal material attached to the inner walls of different heights of the first pipe 110, thereby avoiding the phenomenon of blockage in the first pipe 110 of the coal chute 100.

[0033] It should be noted that since the first pipe 110 is a pipe extending vertically, the axis of the first pipe 110 is a straight line. When the mounting seat 210 moves along the axis of the first pipe 110 under the drive of the lifting device 300, the outer peripheral surface of the mounting seat 210 and the scraper 220 can always be in contact with the inner wall of the first pipe 110 to ensure the scraping effect. In addition, by disposing the rotating mechanism 230 within the mounting seat 210, it can prevent the coal material from affecting the normal operation of the rotating mechanism 230. The scraper 220 is located below the mounting seat 210, so the mounting seat 210 can play a certain shielding role for the scraper 220, thereby avoiding the wet coal material falling from the coal chute 100 onto the scraper 220, and further reducing the situation where the wet coal material adheres to the scraper 220.

[0034] Such as Figure 2As shown, in some alternative embodiments, the rotating mechanism 230 includes a first motor 231, a first gear 232, and a second gear 233. The first gear 232 is fixed on the output shaft of the first motor 231 and meshes with the second gear 233. The axis of the second gear 233 is collinear with the axis of the first pipe 110. The scraper 220 is fixed to the lower end face of the second gear 233.

[0035] The rotation of the first motor 231 drives the rotation of the first gear 232, thereby driving the second gear 233 meshing with the first gear 232 to rotate around the axis of the first pipe 110. Furthermore, the scraper 220 fixed to the end face of the second gear 233 rotates around the axis of the first pipe 110.

[0036] In other embodiments, the rotating mechanism may also include a first motor, a first pulley, a second pulley, and a belt wound around the first pulley and the second pulley. The first pulley is fixed on the output shaft of the first motor, and the scraper is fixed to the lower end face of the second pulley.

[0037] Such as Figure 3 and Figure 4 , in some alternative embodiments, a first installation cavity 212 and a second installation cavity 213 communicating with the first installation cavity 212 are provided in the mounting seat 210. The first motor 231 is installed in the first installation cavity 212, and the output shaft of the motor extends into the second installation cavity 213. The first gear 232 and the second gear 233 are both located in the second installation cavity 213, and the end face of the second gear 233 is rotatably supported on the cavity wall of the second installation cavity 213. An annular channel 214 communicating with the second installation cavity 213 is provided at the bottom of the mounting seat 210. The pipe wall cleaning device 200 further includes a connecting shaft 240. One end of the connecting shaft 240 is connected to the lower end face of the second gear 233, and the other end of the connecting shaft 240 passes through the annular channel 214 and is connected to the scraper 220.

[0038] The first installation cavity 212 and the second installation cavity 213 provided in the mounting seat 210 can prevent external coal material from falling on the first motor 231, the first gear 232, and the second gear 233, thereby ensuring that the first motor 231, the first gear 232, and the second gear 233 can have a longer working life in the coal dropping pipe 100. An annular channel 214 is provided at the bottom of the mounting seat 210, and the end face of the second gear 233 and the scraper 220 are connected through the connecting shaft 240, so that the width of the annular channel 214 can be smaller than the width of the scraper 220, and the area of the annular channel 214 is smaller, further preventing coal material from entering the first chamber and the second chamber through the annular channel 214.

[0039] Optionally, the diameter of the connecting shaft 240 is adapted to the width of the annular channel 214 to make the annular channel 214 have a smaller area.

[0040] In some alternative embodiments, the avoidance channel 211 includes a tapered section, and along the conveying direction of the coal material in the first pipeline 110, the diameter of the tapered section gradually decreases. With such a setting, when the coal material falls from above the mounting base 210, the accumulation of the coal material on the upper end surface of the mounting base 210 can be reduced.

[0041] Optionally, the upper contour line of the avoidance channel 211 is collinear with the upper contour line of the mounting base 210, so that a sharp angle is formed between the upper end of the avoidance channel 211 and the upper end of the mounting base 210, further avoiding the accumulation of the coal material on the upper end surface of the mounting base 210.

[0042] In some alternative embodiments, there are multiple scraping plates 220, and the multiple scraping plates 220 are evenly spaced along the circumferential direction of the first pipeline 110. By providing multiple scraping plates 220, the scraping efficiency of the coal material adhering to the inner wall of the first pipeline 110 by the scraping plates 220 can be improved.

[0043] As Figure 2 shown, for the specific structure of the lifting device 300, in some alternative embodiments, the lifting device 300 includes a second motor 310, a pulling rope 320, and a protective cover 330. The second motor 310 is located outside the first pipeline 110 and fixed to the first pipeline 110. The output shaft of the second motor 310 extends into the first pipeline 110. The protective cover 330 is located inside the first pipeline 110 and covers the outside of the output shaft of the second motor 310. One end of the pulling rope 320 is wound around the output shaft of the second motor 310, and the other end of the pulling rope 320 passes through the lower end of the protective cover 330 and is connected to the mounting base 210.

[0044] By rotating the second motor 310, the pulling rope 320 can be wound or released, thereby realizing the rising or falling of the mounting base 210 connected to the pulling rope 320 in the first pipeline 110. Moreover, by arranging the second motor 310 outside the first pipeline 110, the influence of the coal material on the normal operation of the second motor 310 can be reduced, and the service life of the second motor 310 can be prolonged. By arranging the protective cover 330 inside the first pipeline 110, the influence of the coal material on the normal operation of the second motor 310 can be further reduced, and the service life of the second motor 310 can be further prolonged.

[0045] In other embodiments, the lifting device 300 can also be a telescopic rod.

[0046] Optionally, a plurality of lifting devices 300 are installed on the first pipeline 110, and the plurality of lifting devices 300 are spaced along the circumferential direction of the pipeline. The pulling ropes 320 on the plurality of lifting devices 300 are respectively connected to different positions of the mounting base 210, and the plurality of lifting devices 300 act synchronously, so that the mounting base 210 can be lifted and lowered more smoothly.

[0047] In some alternative embodiments, the top surface of the protective cover 330 is formed as an inclined surface 331 that extends obliquely downward. By providing the inclined surface 331, the accumulation of coal material on the top of the protective cover 330 can be reduced.

[0048] As Figure 1 and Figure 2 shown, in some alternative embodiments, the coal dropping pipe 100 further includes a second pipe 120 that communicates with the first pipe 110. The second pipe 120 has a bent portion 121. The coal dropping pipe assembly further includes a coal pushing device 400. The coal pushing device 400 is located at the bent portion 121. The coal pushing device 400 includes a telescopic mechanism 410 and a pushing plate 420. The telescopic mechanism 410 is located outside the second pipe 120 and fixed to the second pipe 120. The pushing plate 420 is located inside the second pipe 120 and connected to the telescopic mechanism 410.

[0049] By providing the coal pushing device 400 at the bent portion 121 of the second pipe 120 of the coal dropping pipe 100 and driving the pushing plate 420 to move through the telescopic mechanism 410, the coal material at the bent portion 121 can be pushed away from the wall surface of the second pipe 120, so that the coal material can fall downward, thereby reducing the accumulation of coal material at the bent portion 121 of the second pipe 120.

[0050] It should be noted that the connection manner between the first pipe 110 and the second pipe 120 includes, but is not limited to, flange connection, hoop connection, and welding.

[0051] In some alternative embodiments, the second pipe 120 includes a first pipe section 122 and a second pipe section 123 that are connected to each other. The first pipe section 122 is located between the second pipe section 123 and the first pipe 110. The axis of the first pipe section 122 is collinear with the axis of the first pipe 110. The axis of the second pipe section 123 is arranged at an angle with the axis of the first pipe section 122. The connection portion between the first pipe section 122 and the second pipe section 123 forms the bent portion 121. The pushing plate 420 includes a first plate body 421 and a second plate body 422 that are connected to each other. The first plate body 421 is located inside the first pipe section 122 and parallel to the axis of the first pipe section 122. The second plate body 422 is located inside the second pipe section 123 and parallel to the axis of the second pipe section 123.

[0052] By arranging the first plate body 421 of the pushing plate 420 inside the first pipe section 122 and parallel to the axis of the first pipe section 122, and arranging the second plate body 422 of the pushing plate 420 inside the second pipe section 123 and parallel to the axis of the second pipe section 123, a uniform gap can be formed between the first plate body 421 and the first pipe 110, and a uniform gap can be formed between the second plate body 422 and the second pipe 120, thereby reducing the large coal pieces from getting stuck in the gap between the first plate body 421 and the first pipe 110 or in the gap between the second plate body 422 and the second pipe 120.

[0053] Optionally, the distance between the first plate body 421 and the first pipe wall is equal to the distance between the second plate body 422 and the second pipe wall.

[0054] In some alternative embodiments, a first elastic member 430 is connected between the first pipe section 122 and the first plate body 421, and a second elastic member 440 is connected between the second pipe section 123 and the second plate body 422.

[0055] The first elastic member 430 and the second elastic member 440 are provided to be able to provide a buffering force to the push plate 420 through the first elastic member 430 and the second elastic member 440 when the push plate 420 moves towards the pipe wall of the second pipe 120.

[0056] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0057] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, without conflict, they can be combined in any suitable manner. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0058] Furthermore, any combination can be made between various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A coal drop pipe assembly, characterized in that: include: The coal drop pipe comprises a first pipe extending in a vertical direction; a pipe wall cleaning device, arranged in the first pipe, comprising a mounting seat, a scraper and a rotating mechanism, wherein the mounting seat is formed in an annular shape, the outer circumference of the mounting seat is in contact with the inner wall of the first pipe, the inner circumference of the mounting seat defines an escape channel for coal to pass through, the rotating mechanism is installed in the mounting seat, the scraper is located below the mounting seat and in contact with the inner wall of the first pipe, and the rotating mechanism is connected to the scraper and can drive the scraper to rotate around the axis of the first pipe; A lifting device is installed on the first pipeline, the lifting device is connected to the mounting seat and is used to drive the mounting seat to move along the axis of the first pipeline.

2. The coal drop pipe assembly according to claim 1, characterized in that: The rotating mechanism includes a first motor, a first gear and a second gear. The first gear is fixed on the output shaft of the first motor and meshes with the second gear. The axis of the second gear is colinear with the axis of the first pipeline. The scraper is fixed to the lower end surface of the second gear.

3. The coal drop pipe assembly according to claim 2, characterized in that: The mounting seat is provided with a first mounting cavity and a second mounting cavity communicating with the first mounting cavity, the first motor is mounted in the first mounting cavity, the output shaft of the motor extends into the second mounting cavity, the first gear and the second gear are both located in the second mounting cavity, and the end surface of the second gear is rotatably supported on the cavity wall of the second mounting cavity; An annular channel communicating with the second mounting cavity is formed at the bottom of the mounting seat. The pipe wall cleaning device also includes a connecting shaft, one end of which is connected to the lower end surface of the second gear, and the other end of the connecting shaft passes through the annular channel and is connected to the scraper.

4. The coal drop pipe assembly according to claim 1, characterized in that: The avoidance passage comprises a tapered section, and a diameter of the tapered section gradually decreases along the conveying direction of the coal in the first pipeline.

5. The coal drop pipe assembly according to claim 1, characterized in that: There are multiple scrapers, and the multiple scrapers are evenly spaced and distributed along the circumference of the first pipe.

6. The coal drop pipe assembly according to claim 1, characterized in that: The lifting device includes a second motor, a pull rope and a protective cover. The second motor is located outside the first pipe and fixed to the first pipe. The output shaft of the second motor extends into the first pipe. The protective cover is located in the first pipe and covers the outside of the output shaft of the second motor. One end of the pull rope is wound around the output shaft of the second motor, and the other end of the pull rope passes through the lower end of the protective cover and is connected to the mounting seat.

7. The coal drop pipe assembly according to claim 6, characterized in that: The top surface of the protective cover is formed as an inclined surface extending obliquely downward.

8. The coal drop pipe assembly according to any one of claims 1 to 7, characterized in that: The coal drop pipe also includes a second pipe connected to the first pipe, the second pipe has a turning portion, and the coal drop pipe assembly also includes a coal pushing device, the coal pushing device is located at the turning portion, the coal pushing device includes a telescopic mechanism and a push plate, the telescopic mechanism is located outside the second pipe and fixed to the second pipe, and the push plate is located inside the second pipe and connected to the telescopic mechanism.

9. The coal drop pipe assembly according to claim 8, characterized in that: The second pipe comprises a first pipe section and a second pipe section connected to each other, the first pipe section is located between the second pipe section and the first pipe, the axis of the first pipe section is collinear with the axis of the first pipe, the axis of the second pipe section is arranged at an angle to the axis of the first pipe section, and the connection between the first pipe section and the second pipe section constitutes the inflection portion; The push plate includes a first plate body and a second plate body connected to each other. The first plate body is located in the first pipe section and parallel to the axis of the first pipe section. The second plate body is located in the second pipe section and parallel to the axis of the second pipe section.

10. The coal drop pipe assembly according to claim 9, characterized in that: A first elastic member is connected between the first pipe section and the first plate body, and a second elastic member is connected between the second pipe section and the second plate body.

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