A rotatable telescopic steel duct for a fume collecting device

Abstract

This invention discloses a rotatable and telescopic steel pipe for a dust collection device, comprising a first straight pipe with a flue gas inlet; a fixed straight pipe with a flue gas outlet; and a telescopic pipe with rotating joints at both ends, the ends of which are connected to the first straight pipe and the fixed straight pipe respectively via rotating joints. By setting rotating joints at the connections between the first straight pipe and the telescopic pipe, and at the connections between the fixed straight pipe and the telescopic pipe, the invention allows for relative rotation at the connections of the first straight pipe and the telescopic pipe, and between the fixed straight pipe and the telescopic pipe, when the first straight pipe moves vertically up and down intermittently. This causes the telescopic pipe to extend and retract, achieving the function of free rotation and extension of the pipe. The telescopic pipe enables the first straight pipe to move vertically up and down, meeting the performance requirements of the dust collection device during dust collection.

Description

Technical Field

[0001] This invention relates to the field of smoke and dust removal technology, and in particular to a rotatable telescopic steel pipe for a smoke and dust collection device. Background Technology

[0002] In copper smelting converter blowing, the generated slag needs to be hoisted to a fixed location and poured into a cooling slag bag for natural slow cooling. Due to the high temperature of the slag (around 1200℃), a large amount of SO2 dust is generated and dispersed into the surrounding space, causing a certain degree of low-altitude pollution. Therefore, a dust collection device must be used to collect and treat the generated dust in a timely manner. Given the high temperature and strong corrosiveness of the flue gas, and the requirement for the device to have certain impact resistance, the pipes used in the device must be made of steel. Furthermore, before pouring the slag into the cooling slag bag, the flue gas inlet of the dust collection device needs to be raised to make room for the slag hoisting equipment. After the slag hoisting equipment leaves, the flue gas inlet of the dust collection device needs to be lowered back to its original position. Therefore, during the dust collection process, the flue gas inlet needs to be moved up and down intermittently, meaning the pipes used for collecting the flue gas need to be moved up and down intermittently. However, existing steel pipes cannot meet this requirement.

[0003] Therefore, the existing technology still needs to be improved and enhanced. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a rotatable telescopic steel pipe for a dust collection device, which aims to solve the problem that the steel pipe in the prior art cannot be moved up and down intermittently during the dust collection process.

[0005] The technical solution adopted by this invention to solve the technical problem is as follows:

[0006] In a first aspect, embodiments of the present invention provide a rotatable telescopic steel pipe for a dust collection device, comprising:

[0007] The first straight pipe is provided with a flue gas inlet;

[0008] A fixed straight pipe, wherein the fixed straight pipe is provided with a flue gas outlet;

[0009] The retractable pipeline has swivel joints at both ends, and the two ends of the retractable pipeline are respectively connected to the first straight pipe and the fixed straight pipe through the swivel joints.

[0010] As a further improved technical solution, the telescopic pipeline includes a first bend, a second straight pipe, an expansion joint, and a second bend; one end of the first bend is connected to one end of the first straight pipe through a swivel joint, the other end of the first bend is connected to one end of the second straight pipe, the other end of the second straight pipe is connected to one end of the second bend through the expansion joint, and the other end of the second bend is connected to one end of the fixed straight pipe through a swivel joint.

[0011] As a further improved technical solution, the swivel joint includes a first flange, a second flange, and a third flange;

[0012] When the swivel joint is located between the first straight pipe and the first bend, the first flange is fixedly located on the outside of one end of the first bend, the second flange is fixedly located on the outside of one end of the first straight pipe, and the third flange is detachably located on the side of the first flange near the first straight pipe. After the opposite sides of the first flange and the third flange are connected, a circular groove is formed. The second flange is located in the circular groove, and there is a gap between the outside of the first straight pipe with the second flange and the third flange.

[0013] As a further improved technical solution, when the rotary joint is located between the fixed straight pipe and the second bend, the first flange is fixedly located on the outside of one end of the second bend, the second flange is fixedly located on the outside of one end of the fixed straight pipe, and the third flange is detachably located on the side of the first flange near the fixed straight pipe. After the opposite sides of the first flange and the third flange are connected, a circular groove is formed. The second flange is located in the circular groove, and there is a gap between the outside of the fixed straight pipe with the second flange and the third flange.

[0014] As a further improved technical solution, the rotary joint also includes a first liner;

[0015] When the rotary joint is located between the first straight pipe and the first bend, one end of the first liner is fixedly connected to the inner side of the end of the first straight pipe where the second flange is located, and the other end of the first liner abuts against the inner side of one end of the first bend.

[0016] When the swivel joint is located between the fixed straight pipe and the second bend, one end of the first liner is fixedly connected to the inner side of the fixed straight pipe where the second flange is located, and the other end of the first liner abuts against the inner side of one end of the second bend.

[0017] As a further improvement, the aforementioned rotatable and telescopic steel pipe for the dust collection device also includes:

[0018] A bolt assembly, comprising a bolt and two nuts; the bolt assembly is provided on the first flange and the third flange, the bolt passing through the first flange and the second flange, and the two nuts being respectively fastened to both ends of the bolt.

[0019] As a further improved technical solution, the first flange and the third flange are provided with a plurality of bolt assemblies, and the plurality of bolt assemblies are evenly distributed on the first flange and the second flange at intervals.

[0020] As a further improved technical solution, the expansion joint includes a third straight pipe, a second liner, a third liner, a fourth flange, a fifth flange, a sixth flange, and a seventh flange; the fourth flange is fixedly disposed at the end of the second straight pipe away from the first bend, the fifth flange is disposed at one end of the second liner, the fourth flange and the fifth flange are provided with the bolt assembly and connected by the bolt assembly, one end of the third liner is sleeved on the outside of the other end of the second liner, the third liner is located inside the third straight pipe and the outside of the third liner abuts against the inside of the third straight pipe, the end of the third straight pipe away from the second straight pipe is connected to one end of the second bend, the sixth flange is fixedly disposed at the end of the third straight pipe near the second straight pipe, and the seventh flange is disposed on the side of the sixth flange near the second straight pipe by the bolt assembly, and the inner diameter of the seventh flange is smaller than the inner diameter of the third straight pipe; when the expansion joint extends to its maximum length, the end face of the third liner near the second liner abuts against one side of the seventh flange.

[0021] As a further improved technical solution, the expansion joint also includes an eighth flange and a ninth flange; the eighth flange is disposed at the end of the third straight pipe away from the second straight pipe, and the ninth flange is disposed at the end of the second bend pipe close to the third straight pipe. The eighth flange and the ninth flange are provided with the bolt assembly and are connected by the bolt assembly.

[0022] As a further improved technical solution, the expansion joint also includes a sealing gasket, which is disposed between the sixth flange and the seventh flange. When the expansion joint is extended to its maximum length, the end face of the third liner near the second liner abuts against the sealing gasket.

[0023] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0024] This invention provides a rotatable and telescopic steel pipe for a dust collection device, comprising a first straight pipe with a flue gas inlet; a fixed straight pipe with a flue gas outlet; and a telescopic pipe with rotating joints at both ends, the ends of which are connected to the first straight pipe and the fixed straight pipe respectively via rotating joints. By providing rotating joints at the connections between the first straight pipe and the telescopic pipe, and at the connections between the fixed straight pipe and the telescopic pipe, when the first straight pipe remains horizontal and moves vertically up and down intermittently, the connections between the first straight pipe and the telescopic pipe, and between the fixed straight pipe and the telescopic pipe, will rotate relative to each other, and the telescopic pipe will extend and retract. This achieves the function of free rotation and extension of the pipe. The telescopic pipe allows the first straight pipe to remain horizontal and move vertically up and down, meeting the performance requirements of the dust collection device during dust collection. Attached Figure Description

[0025] Figure 1 A schematic diagram of a rotatable telescopic steel pipe for a dust collection device provided by the present invention;

[0026] Figure 2 A front view of a rotatable telescopic steel pipe for a dust collection device provided by the present invention;

[0027] Figure 3 A left view of a rotatable telescopic steel pipe for a dust collection device provided by the present invention;

[0028] Figure 4 A top view of a rotatable telescopic steel pipe for a dust collection device provided by the present invention;

[0029] Figure 5 This is a schematic diagram of the cross-sectional structure of the rotary joint in this invention;

[0030] Figure 6 This is a schematic diagram of the circular groove inside the rotating joint in this invention;

[0031] Figure 7 This is a partial structural diagram of the rotary joint in this invention;

[0032] Figure 8 This is a schematic diagram of the expansion joint structure in this invention;

[0033] Figure 9 This is a top view of the telescopic joint in this invention.

[0034] In the diagram: 1. First straight pipe; 101. Flue gas inlet; 2. Fixed straight pipe; 201. Flue gas outlet; 3. Telescopic pipe; 301. First bend; 302. Second straight pipe; 303. Expansion joint; 3031. Third straight pipe; 3032. Second liner; 3033. Third liner; 3034. Fourth flange; 3035. Fifth flange; 3036. Sixth flange; 3037. Seventh flange; 3038. Eighth flange; 3039. Ninth flange; 3010. Sealing gasket; 304. Second bend; 4. Rotary joint; 401. First flange; 402. Second flange; 403. Third flange; 404. Circular groove; 405. First liner; 5. Bolt assembly; 501. Threaded rod; 502. Nut; 6. Ash discharge port. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] Example:

[0037] like Figures 1-9 As shown. The rotatable and telescopic steel pipe for the dust collection device includes: a first straight pipe 1, on which a flue gas inlet 101 is provided; a fixed straight pipe 2, on which a flue gas outlet 201 is provided; and a telescopic pipe 3, on which both ends are provided with rotating joints 4, and the two ends of the telescopic pipe 3 are respectively connected to the first straight pipe 1 and the fixed straight pipe 2 through the rotating joints 4.

[0038] like Figures 1-3As shown, in this embodiment, the rotatable telescopic steel pipe includes a first straight pipe 1, a fixed straight pipe 2, a telescopic pipe 3, and a rotating joint 4. The fixed straight pipe 2 remains stationary. A flue gas inlet 101 is located on the bottom side of the first straight pipe 1. Multiple flue gas inlets 101, such as three, are arranged in a row along the length of the first straight pipe 1. A slag bag for holding slag is located below the flue gas inlet 101. Before pouring in the slag, the first straight pipe 1 needs to be moved horizontally up and down to create space for the slag to enter the slag bag. The pipes used for flue gas exhaust in smelters are all rigid and relatively thick. If existing steel pipes are used to directly connect the fixed straight pipe 2 and the first straight pipe 1, it is obviously impossible to move the first straight pipe 1 horizontally up and down. Therefore, in this embodiment, a telescopic pipe 3 and a rotating joint 4 are used to connect the first straight pipe 1 and the fixed straight pipe 2. Specifically, the telescopic pipe 3 is located between the fixed straight pipe 2 and the first straight pipe 1. The front end of the retractable pipe 3 is connected to the left end of the first straight pipe 1 via a swivel joint 4. The rear end of the retractable pipe 3 is connected to the left end of the fixed straight pipe 2 via a swivel joint 4. The first straight pipe 1, the retractable pipe 3, and the fixed straight pipe 2 form a U-shaped pipe. Before the first straight pipe 1 moves, that is, when the first straight pipe 1 is in its initial position, it is on the same horizontal plane and parallel to the fixed straight pipe 2. When the first straight pipe 1 remains horizontal and moves upward, the end face of the left end of the first straight pipe 1 rotates relative to the end face of the front end of the retractable pipe 3. The left end face of the straight pipe 2 rotates relative to the rear end face of the telescopic pipe 3, causing the telescopic pipe 3 to extend and lengthen, changing from a horizontal to an inclined state. When the first straight pipe 1 moves horizontally downwards and returns to its initial position, the left end face of the first straight pipe 1 rotates relative to the front end face of the telescopic pipe 3, and the left end face of the fixed straight pipe 2 rotates relative to the rear end face of the telescopic pipe 3 in the opposite direction, causing the telescopic pipe 3 to contract and shorten, returning from an inclined state to a horizontal state. In this invention, the telescopic pipe 3 can freely extend and shorten as the first straight pipe 1 moves vertically up and down. When the first straight pipe 1 moves from the upper or lower part towards the midpoint, the telescopic pipe 3 automatically shortens; when the first straight pipe 1 moves from the midpoint towards the upper or lower part, the telescopic pipe 3 automatically extends. During the up-and-down movement of the first straight pipe 1 and the swinging of the telescopic pipe 3 around the fixed straight pipe 2, the two ends of the telescopic pipe 3 achieve relative rotation of the pipes connected to it through the swivel joint 4.This invention provides a rotating joint 4 at the connection between the first straight pipe 1 and the telescopic pipe 3, and at the connection between the fixed straight pipe 2 and the telescopic pipe 3. When the first straight pipe 1 remains horizontal and moves horizontally up and down intermittently, the connection between the first straight pipe 1 and the telescopic pipe 3, and the connection between the fixed straight pipe 2 and the telescopic pipe 3, will rotate relative to each other, and the telescopic pipe 3 will extend and retract. This achieves the function of free rotation and extension of the pipe. The telescopic pipe 3 allows the first straight pipe 1 to remain horizontal and move vertically up and down, thus meeting the performance requirements of the dust collection device for the pipe during the dust collection process.

[0039] like Figure 4 As shown, as a further embodiment, along the direction from the front end to the rear end of the retractable pipe 3, the retractable pipe 3 includes a first bend 301, a second straight pipe 302, an expansion joint 303, and a second bend 304 connected in sequence; the front end of the first bend 301 is connected to the left end of the first straight pipe 1 via a swivel joint 4, the rear end of the first bend 301 is connected to the front end of the second straight pipe 302, the rear end of the second straight pipe 302 is connected to the front end of the second bend 304 via the expansion joint 303, and the rear end of the second bend 304 is connected to the left end of the fixed straight pipe 2 via a swivel joint 4; wherein, the first bend 301... The front end and the rear end opening of the second bend 304 both face to the right. When the first straight pipe 1 moves horizontally up and down, the front end face of the first bend 301 rotates relative to the left end face of the first straight pipe 1, and the rear end face of the second bend 304 rotates relative to the left end of the fixed straight pipe 2. The rear end of the second straight pipe 302 drives the front end of the expansion joint 303 to extend and retract. When the first straight pipe 1 moves horizontally upward, the front end of the expansion joint 303 extends, and the expansion joint 303 becomes longer; when the first straight pipe 1 moves horizontally downward, the front end of the expansion joint 303 retracts, and the expansion joint 303 becomes shorter. In this embodiment, the retractable pipeline 3 extends and retracts through the expansion joint 303.

[0040] like Figures 5-7As shown, as a further embodiment, the swivel joint 4 includes a first flange 401, a second flange 402, and a third flange 403. When the swivel joint 4 is located between the first straight pipe 1 and the first bent pipe 301, the first flange 401 is fitted onto the front end of the first bent pipe 301 and fixed relative to it by welding. The second flange 402 is fitted onto the left end of the first straight pipe 1 and fixed relative to it by welding. The third flange 403 is detachably located on the right side of the first flange 401. The third flange 403 is the same size as the first flange 401, and the right side of the first flange 401... A circular groove 404 is formed after the first straight pipe 1 connects with the left side of the third flange 403. The second flange 402 is located in the circular groove 404, and the outer side of the second flange 402 abuts against the inner side of the circular groove 404 to prevent flue gas from escaping from the circular groove 404. The circular groove 404 also limits the movement of the second flange 402, preventing it from wobbling within the groove and enhancing the overall structural stability of the pipeline. Furthermore, a gap is provided between the outer side of the left end of the first straight pipe 1 and the third flange 403 to avoid resistance when the first straight pipe 1 and the third flange 403 rotate relative to each other. When the first straight pipe 1 moves horizontally up and down, the first bend 301 causes the first flange 401 and the second flange 402 to rotate relative to each other.

[0041] In this embodiment, when the swivel joint 4 is located between the fixed straight pipe 2 and the second bend pipe 304, the first flange 401 is sleeved on the rear end of the second bend pipe 304 and fixed relative to it by welding, the second flange 402 is sleeved on the left end of the fixed straight pipe 2 and fixed relative to it by welding, and the third flange 403 is detachably located on the right side of the first flange 401. The third flange 403 is the same size as the first flange 401, and the right side of the first flange 401 is connected to the left side of the third flange 403 to form a... A circular groove 404 is provided, and the second flange 402 is located within the circular groove 404. The outer side of the second flange 402 abuts against the inner side of the circular groove 404 to prevent flue gas from escaping from the circular groove 404. The circular groove 404 also limits the movement of the second flange 402, preventing it from wobbling within the groove and enhancing the overall structural stability of the pipeline. Furthermore, a gap is provided between the outer side of the left end of the fixed straight pipe 2 and the third flange 403 to avoid resistance when the fixed straight pipe 2 and the third flange 403 rotate relative to each other. When the first straight pipe 1 moves horizontally up and down, the second bend 304 causes the first flange 401 and the second flange 402 to rotate relative to each other.

[0042] As a further embodiment, the rotating joint 4 also includes a first liner 405; when the rotating joint 4 is located between the first straight pipe 1 and the first bent pipe 301, the right end of the first liner 405 is fixedly connected to the inner side of the left end of the first straight pipe 1 by welding, and the left end of the first liner 405 abuts against the inner side of the front end of the first bent pipe 301. The first liner 405 can provide support and connection for the left end of the first straight pipe 1, and at the same time prevent the flue gas at the front end of the first bent pipe 301 from escaping, thereby strengthening the tightness and structural stability between the first bent pipe 301 and the first straight pipe 1.

[0043] When the rotating joint 4 is located between the fixed straight pipe 2 and the second bend pipe 304, the right end of the first liner 405 is fixedly connected to the inner side of the left end of the fixed straight pipe 2 by welding, and the left end of the first liner 405 abuts against the inner side of the front end of the second bend pipe 304. The first liner 405 can support and connect the left end of the fixed straight pipe 2, and at the same time prevent the flue gas at the front end of the second bend pipe 304 from escaping, thereby strengthening the tightness and structural stability between the second bend pipe 304 and the fixed straight pipe 2.

[0044] As a further embodiment, the rotatable and telescopic steel pipe for the dust collection device also includes a bolt assembly 5, which comprises a screw 501 and two nuts 502. The bolt assembly 5 is provided on the first flange 401 and the third flange 403, with the screw 501 passing through both the first flange 401 and the second flange 402, and the two nuts 502 respectively fastened to both ends of the screw 501. Furthermore, multiple bolt assemblies 5 are provided on the first flange 401 and the third flange 403, and these multiple bolt assemblies 5 are evenly distributed on the first flange 401 and the second flange 402. The first flange 401 and the third flange 403 in the rotating section 4 are connected by the bolt assembly 5, facilitating the disassembly and assembly of the various pipes.

[0045] like Figures 8-9As shown, in this embodiment, the expansion joint 303 includes a third straight pipe 3031, a second liner 3032, a third liner 3033, a fourth flange 3034, a fifth flange 3035, a sixth flange 3036, and a seventh flange 3037. The fourth flange 3034 is fixedly disposed on the upper end of the second straight pipe 302, and the fifth flange 3035 is disposed on the lower end of the second liner 3032. The fourth flange 3034 and the fifth flange 3035 are provided with bolt assemblies 5 and connected by the bolt assemblies 5. The lower end of the third liner 3033 is sleeved on the outer side of the upper end of the second liner 3032 and fixedly connected by welding. The third liner 3033 is located inside the third straight pipe 3031, and the outer side of the third liner 3033 abuts against the inner side of the third straight pipe 3031. The upper end of 3031 is connected to one end of the second bend 304. The sixth flange 3036 is fixedly installed on the outer side of the lower end of the third straight pipe 3031. The seventh flange 3037 is installed on the bottom side of the sixth flange 3036 through the bolt assembly 5, and the inner diameter of the seventh flange 3037 is smaller than the inner diameter of the third straight pipe 3031. When the expansion joint 303 extends to its maximum length, the end face of the lower end of the third liner 3033 abuts against one side of the seventh flange 3037. When the expansion joint 303 retracts to its shortest length, the nut 502 on the top side of the fifth flange 3035 abuts against the nut 502 on the bottom side of the seventh flange 3037. When the third liner 3033 slides inside the third straight pipe 3031, the outer side of the second liner 3032 contacts the inner wall of the seventh flange 3037 and slides relative to it.

[0046] As a further embodiment, the expansion joint 303 also includes an eighth flange 3038 and a ninth flange 3039; the eighth flange 3038 is located at the upper end of the third straight pipe 3031, and the ninth flange 3039 is located at the end of the second bend 304 near the third straight pipe 3031. The eighth flange 3038 and the ninth flange 3039 are provided with bolt assemblies 5 and are connected by the bolt assemblies 5. It should be noted that all flanges and pipes in this embodiment are made of Q235-A material; and the outer side of the third straight pipe 3031 is provided with ash discharge ports 6, and there are multiple ash discharge ports 6, such as 2, 3, etc., which can control the ash discharge speed and ash discharge volume.

[0047] As a further improvement, the expansion joint 303 also includes a sealing gasket 3010, which is disposed between the sixth flange 3036 and the seventh flange 3037. When the expansion joint 303 extends to its maximum length, the lower end face of the third liner 3033 abuts against the top side of the sealing gasket 3010, thereby sealing the lower end of the third straight pipe 3031 through the sealing gasket 3010 to prevent the third liner 3033 from leaking flue gas at this point when sliding. When the third liner 3033 slides, the outer side of the second liner 3032 contacts and slides relative to the sealing gasket 3010. The sealing gasket 3010 can be a rubber gasket.

[0048] In summary, the present invention provides a rotatable telescopic steel pipe for a dust collection device, comprising a first straight pipe 1 with a flue gas inlet 101; a fixed straight pipe 2 with a flue gas outlet 201; and a telescopic pipe 3 with swivel joints 4 at both ends, the ends of which are connected to the first straight pipe 1 and the fixed straight pipe 2 respectively via the swivel joints 4. This invention provides a rotating joint 4 at the connection between the first straight pipe 1 and the telescopic pipe 3, and at the connection between the fixed straight pipe 2 and the telescopic pipe 3. When the first straight pipe 1 remains horizontal and moves vertically up and down intermittently, the connection between the first straight pipe 1 and the telescopic pipe 3, and the connection between the fixed straight pipe 2 and the telescopic pipe 3, will rotate relative to each other, and the telescopic pipe 3 will extend and retract. This achieves the function of free rotation and extension of the pipe. The telescopic pipe 3 allows the first straight pipe 1 to remain horizontal and move vertically up and down, thus meeting the performance requirements of the dust collection device for the pipe during the dust collection process.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0054] Of course, the above description of the embodiments of the present invention is quite detailed, but it should not be construed as a limitation on the scope of protection of the present invention. The present invention may have many other implementations. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention. The scope of protection of the present invention is determined by the appended claims.

Claims

1. A rotatable telescopic steel pipe for a dust collection device, characterized in that, include: The first straight pipe is provided with a flue gas inlet; A fixed straight pipe, wherein the fixed straight pipe is provided with a flue gas outlet; A telescopic pipe is provided at both ends, and the two ends of the telescopic pipe are respectively connected to a first straight pipe and a fixed straight pipe through the swivel joints; the telescopic pipe includes a first bend, a second straight pipe, a telescopic joint, and a second bend; one end of the first bend is connected to one end of the first straight pipe through a swivel joint, the other end of the first bend is connected to one end of the second straight pipe, the other end of the second straight pipe is connected to one end of the second bend through the telescopic joint, and the other end of the second bend is connected to one end of the fixed straight pipe through a swivel joint; A bolt assembly, the bolt assembly including a bolt and two nuts; The expansion joint includes a third straight pipe, a second liner, a third liner, a fourth flange, a fifth flange, a sixth flange, and a seventh flange. The fourth flange is fixedly disposed at the end of the second straight pipe away from the first bend. The fifth flange is disposed at one end of the second liner. The fourth flange and the fifth flange are provided with bolt assemblies and connected by the bolt assemblies. One end of the third liner is sleeved on the outside of the other end of the second liner. The third liner is located inside the third straight pipe, and the outside of the third liner abuts against the inside of the third straight pipe. The end of the third straight pipe away from the second straight pipe is connected to one end of the second bend. The sixth flange is fixedly disposed at the end of the third straight pipe near the second straight pipe. The seventh flange is disposed on the side of the sixth flange near the second straight pipe by the bolt assembly, and the inner diameter of the seventh flange is smaller than the inner diameter of the third straight pipe. When the expansion joint extends to its maximum length, the end face of the third liner near the second liner abuts against one side of the seventh flange.

2. The rotatable telescopic steel pipe for a dust collection device according to claim 1, characterized in that, The swivel joint includes a first flange, a second flange, and a third flange; When the swivel joint is located between the first straight pipe and the first bend, the first flange is fixedly located on the outside of one end of the first bend, the second flange is fixedly located on the outside of one end of the first straight pipe, and the third flange is detachably located on the side of the first flange near the first straight pipe. After the opposite sides of the first flange and the third flange are connected, a circular groove is formed. The second flange is located in the circular groove, and there is a gap between the outside of the first straight pipe with the second flange and the third flange.

3. The rotatable telescopic steel pipe for a dust collection device according to claim 2, characterized in that, When the rotary joint is located between the fixed straight pipe and the second bend, the first flange is fixedly located on the outside of one end of the second bend, the second flange is fixedly located on the outside of one end of the fixed straight pipe, and the third flange is detachably located on the side of the first flange near the fixed straight pipe. After the opposite sides of the first flange and the third flange are connected, a circular groove is formed. The second flange is located in the circular groove, and there is a gap between the outside of the fixed straight pipe with the second flange and the third flange.

4. The rotatable telescopic steel pipe for a dust collection device according to claim 3, characterized in that, The rotary joint also includes a first liner; When the rotary joint is located between the first straight pipe and the first bend, one end of the first liner is fixedly connected to the inner side of the end of the first straight pipe where the second flange is located, and the other end of the first liner abuts against the inner side of one end of the first bend. When the swivel joint is located between the fixed straight pipe and the second bend, one end of the first liner is fixedly connected to the inner side of the fixed straight pipe where the second flange is located, and the other end of the first liner abuts against the inner side of one end of the second bend.

5. The rotatable telescopic steel pipe for a dust collection device according to claim 4, characterized in that, The bolt assembly is provided on the first flange and the third flange, the screw passes through the first flange and the second flange, and the two nuts are respectively fastened to both ends of the screw.

6. The rotatable telescopic steel pipe for a dust collection device according to claim 5, characterized in that, The first flange and the third flange are provided with a plurality of bolt assemblies, and the plurality of bolt assemblies are evenly distributed on the first flange and the second flange at intervals.

7. The rotatable telescopic steel pipe for a dust collection device according to claim 1, characterized in that, The expansion joint also includes an eighth flange and a ninth flange; the eighth flange is located at the end of the third straight pipe away from the second straight pipe, and the ninth flange is located at the end of the second bend pipe near the third straight pipe. The eighth flange and the ninth flange are provided with the bolt assembly and are connected by the bolt assembly.

8. The rotatable telescopic steel pipe for a dust collection device according to claim 7, characterized in that, The expansion joint also includes a sealing gasket, which is disposed between the sixth flange and the seventh flange. When the expansion joint is extended to its maximum length, the end face of the third liner near the second liner abuts against the sealing gasket.

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