A pipe joint for waste heat recovery device in activated alumina production

Abstract

The present invention relates to the technical field of pipe joints, and in particular to a pipe joint for a waste heat recovery and utilization device in the production of activated alumina, which comprises a supporting component, including a first pipe, a second pipe arranged on the right side of the first pipe, a first flange arranged on the first pipe, a second flange arranged on the second pipe, threaded holes arranged on the first flange and the second flange, and bolts arranged on the second flange; a bypass component, including a pipeline assembly arranged in the first flange, a first closing assembly arranged on the first flange, a second closing assembly arranged on the second flange, a limiting assembly arranged on the closing assembly, and a movable assembly arranged on the limiting assembly. The device of the present invention can switch pipelines when a joint leaks, so as to avoid shutdown affecting the waste heat recovery effect.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline joints, in particular to a pipeline joint for a waste heat recovery and utilization device in the production of activated alumina. Background Art

[0002] During the production of activated alumina, it is necessary to carry out high-temperature calcination of the activated alumina, which will generate a lot of heat. In order to save energy, waste heat recovery is started, and waste heat recovery devices are used. The most common waste heat recovery device is a waste heat recoverer.

[0003] During use, when the waste heat recovery device is in use, it is necessary to dock the pipe on the waste heat recovery device with the transmission pipe. The common docking device is two flanges. A sealing gasket is set at the flange joint for sealing, and then multiple bolts are turned to fix it. However, this method only has one passage for the transmission of liquid or gas. When the sealing ring leaks, it is necessary to stop the machine to disassemble the flange and then replace it. During the shutdown operation, it is inevitable that heat will be carried away by the air, which will affect the overall effect of waste heat recovery. Summary of the invention

[0004] In view of the fact that in the above-mentioned prior art there is only one passage for transmitting liquid or gas when flanges are used to connect pipes, when the sealing ring leaks, the waste heat recovery device needs to be shut down for replacement, at which time heat will be carried away by the air, affecting the overall effect of waste heat recovery, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a pipe joint for a waste heat recovery device in the production of activated alumina.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: comprising a supporting component, including a first pipe, a second pipe arranged on the right side of the first pipe, a first flange arranged on the first pipe, a second flange arranged on the second pipe, threaded holes arranged on the first flange and the second flange, and bolts arranged on the second flange; a bypass component, including a pipeline assembly arranged in the first flange, a first closing assembly arranged on the first flange, a second closing assembly arranged on the second flange, a limiting assembly arranged on the closing assembly, and a movable assembly arranged on the limiting assembly; a switching component, including a transmission assembly arranged on the closing assembly, a toggle assembly arranged on the limiting assembly, a hand-toggle assembly arranged on the toggle assembly, and an anti-loosening assembly arranged on the hand-toggle assembly.

[0007] As a preferred solution of the pipe joint for the waste heat recovery device in the activated alumina production of the present invention, the pipeline assembly includes two L-shaped openings arranged on the first flange plate and the second flange plate, and an inner groove is provided at the joint of the two L-shaped openings, and a sealing strip is provided in the inner groove.

[0008] As a preferred solution of the pipe joint for the waste heat recovery device in the production of activated alumina of the present invention, the first closing component includes a plurality of mounting grooves arranged on the inner wall of the first flange plate, and a first sealing plate is arranged in each of the plurality of mounting grooves. The plurality of the first sealing plates are combined into a circular disc with a diameter equal to the inner diameter of the first pipe, the width of the mounting groove is greater than the depth of the L-shaped opening, and the sealing plate is elastically connected to the inner wall of the mounting groove through a first spring.

[0009] As a preferred solution of the pipe joint for the waste heat recovery device in the production of activated alumina of the present invention, the second sealing component includes a plurality of extension grooves arranged on the inner walls of a plurality of L-shaped openings on the second flange plate, and a rotating shaft is rotatably connected in each of the plurality of extension grooves, and a torsion spring is provided on the rotating shaft, and an extension block is fixedly connected to the rotating shaft, and a second sealing plate is fixedly connected to the extension block, and a plurality of the second sealing plates are combined into a disc with a diameter equal to that of the second pipe.

[0010] As a preferred solution for the pipe joint for the waste heat recovery device in the production of activated alumina of the present invention, the limiting assembly includes a strip opening passing through the first flange plate, the strip opening extends into the mounting groove, a water stop plate matching the L-shaped opening is slidably connected in the strip opening, a wedge block is provided on the water stop plate, and a vertical opening matching the wedge block is provided on the first sealing plate.

[0011] As a preferred solution for the pipe joint of the waste heat recovery device in the production of activated alumina of the present invention, the movable component includes a mounting cylinder fixedly connected to the water stop plate, a movable disk is slidably connected inside the mounting cylinder, and the movable disk is elastically connected to the inner wall of the mounting cylinder through a second spring, and the wedge block passes through the mounting cylinder and is fixedly connected to the movable disk.

[0012] As a preferred solution of the pipe joint for the waste heat recovery device in the production of activated alumina of the present invention, wherein: the transmission assembly includes an opening passing through the mounting groove and the first flange, a U-shaped rod passes through and is slidably connected in the opening, the U-shaped rod is fixedly connected to the first sealing plate, a circular ring is rotatably connected to the first flange, an expansion ring is provided on the circular ring, a plurality of first arc grooves are provided on the expansion ring, a first guide rod matching the first arc groove is fixedly connected to the U-shaped rod, and the distance between the first arc groove and the circular ring decreases in sequence in a clockwise direction along the expansion ring.

[0013] As a preferred solution of the pipe joint for the waste heat recovery device in the production of activated alumina of the present invention, wherein: the toggle assembly includes a plurality of second arc grooves arranged on the inner wall of the ring, a second guide rod is slidably connected in the second arc groove, the water stop plate passes through the first flange plate and is sealingly and slidably connected to the first flange plate, the second guide rod is fixedly connected to the water stop plate, and the distance between the second arc groove and the first flange plate increases successively along the clockwise direction of the ring.

[0014] As a preferred solution of the pipe joint for the waste heat recovery device in the production of activated alumina of the present invention, the hand-shift assembly includes a U-shaped seat fixedly connected to a circular ring, and a shift block is rotatably connected to the U-shaped seat.

[0015] As a preferred solution of the pipe joint for the waste heat recovery device in the production of activated alumina of the present invention, the anti-loosening component includes a receiving port arranged on the shift block, a screw hole is provided on the inner wall of the receiving port, a screw rod is threadedly connected to the inner thread of the screw hole, and a turntable is fixedly connected to the outer end of the screw rod.

[0016] The beneficial effects of the pipe joint for a waste heat recovery and utilization device in the production of activated alumina of the present invention are as follows: an L-shaped opening is set on the flange through a bypass component to form another channel, and when the first pipe and the second pipe leak at the joint, the connection between the first pipe and the second pipe can be closed, and liquid or gas can be discharged from the L-shaped opening, thereby avoiding shutdown, and when switching channels, only the ring needs to be turned, which is easy to use, thereby solving the problem that when the flange is used to achieve pipe docking, there is only one passage for transmitting liquid or gas, and when the sealing ring leaks, the waste heat recovery device needs to be shut down for replacement, and heat will be taken away by the air at this time, affecting the overall effect of waste heat recovery. The effect of transmitting heat without stopping when the first pipe and the second pipe leak is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is an overall schematic diagram of the pipe joints used in the waste heat recovery and utilization device in the production of activated alumina.

[0019] Figure 2 This is a cross-sectional view of a pipe joint used in a waste heat recovery device in the production of activated alumina.

[0020] Figure 3 for Figure 2A schematic diagram of the enlarged structure.

[0021] Figure 4 This is an exploded view of the limit assembly of the pipe joint used in the waste heat recovery device in the production of activated alumina.

[0022] Figure 5 This is a schematic diagram of the external structure of the anti-loosening component of the pipe joint used in the waste heat recovery and utilization device in the production of activated alumina.

[0023] Figure 6 This is a schematic diagram of the cross-sectional structure of the second flange of the pipe joint used in the waste heat recovery and utilization device in the production of activated alumina.

[0024] In the figure: 100, supporting component; 101, first pipeline; 102, second pipeline; 103, first flange; 104, second flange; 105, threaded hole; 106, bolt; 200, bypass component; 201, pipeline assembly; 201a, L-shaped opening; 201b, inner groove; 201c, sealing strip; 202, first closing assembly; 202a, mounting groove; 202b, first sealing plate; 202c, first spring; 203, second closing assembly; 203a, extension groove; 203b, rotating shaft; 203c, extension block; 203d, second sealing plate; 204, limit assembly; 204a, strip opening; 2 04b, water stop plate; 204c, wedge block; 204d, vertical opening; 205, movable component; 205a, mounting tube; 205b, movable disk; 205c, second spring; 300, switching component; 301, transmission component; 301a, opening; 301b, U-shaped rod; 301c, circular ring; 301d, expansion ring; 301e, first arc groove; 301f, first guide rod; 302, toggle component; 302a, second arc groove; 302b, second guide rod; 303, hand toggle component; 303a, U-shaped seat; 303b, toggle block; 304, anti-loosening component; 304a, accommodating port; 304b, screw. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1

[0029] Reference Figure 1 to Figure 6 , which is the first embodiment of the present invention, and provides a pipe joint for a waste heat recovery and utilization device in the production of activated alumina, which can achieve the effect of automatically switching the flow direction of liquid or gas when leakage occurs at the joint between the first flange 103 and the second flange 104, and comprises a supporting component 100, including a first pipe 101, a second pipe 102 arranged on the right side of the first pipe 101, a first flange 103 arranged on the first pipe 101, a second flange 104 arranged on the second pipe 102, a threaded hole 105 arranged on the first flange 103 and the second flange 104, and a threaded hole 106 arranged on the second flange 106. 04; the bypass component 200 includes a pipeline component 201 arranged in the first flange 103, a first closing component 202 arranged on the first flange 103, a second closing component 203 arranged on the second flange 104, a limiting component 204 arranged on the closing component, and a movable component 205 arranged on the limiting component 204; the switching component 300 includes a transmission component 301 arranged on the closing component, a toggle component 302 arranged on the limiting component 204, a hand-shift component 303 arranged on the toggle component 302, and an anti-loosening component 304 arranged on the hand-shift component 303.

[0030] Specifically, the contacting surfaces of the first flange 103 and the second flange 104 are both provided with support grooves, and a sealing ring is provided in the support groove to achieve sealing between the first flange 103 and the second flange 104. A nut is provided at the left end of the bolt 106, and the nut cooperates with the bolt 106 to further ensure the stability of the seal between the first flange 103 and the second flange 104.

[0031] Furthermore, the pipeline assembly 201 includes two L-shaped openings 201a arranged on the first flange 103 and the second flange 104, and an inner groove 201b is provided at the joint of the two L-shaped openings 201a, and a sealing strip 201c is provided in the inner groove 201b; the first closing assembly 202 includes a plurality of mounting grooves 202a arranged on the inner wall of the first flange 103, and a first sealing plate 202b is provided in each of the plurality of mounting grooves 202a, and the plurality of first sealing plates 202b are combined into a circular disk with a diameter equal to the inner diameter of the first pipe 101, and the width of the mounting groove 202a is greater than the depth of the L-shaped opening 201a, and the sealing plate is elastically connected to the inner wall of the mounting groove 202a through a first spring 202c, and the lower ends of the two L-shaped openings 201a are respectively connected to the first pipe 101 and the second pipe 102, and the plurality of first sealing plates 202b are located on the right side of the left end L-shaped opening 201a.

[0032] Preferably, the second sealing component 203 includes a plurality of extension grooves 203a arranged on the inner wall of the plurality of L-shaped openings 201a on the second flange 104, and the plurality of extension grooves 203a are rotatably connected with a rotating shaft 203b, and the rotating shaft 203b is provided with a torsion spring, and the rotating shaft 203b is fixedly connected with an extension block 203c, and the extension block 203c is fixedly connected with a second sealing plate 203d, and the plurality of second sealing plates 203d are combined into a disk having a diameter equal to that of the second pipe 102; the limiting component 204 includes a strip opening 204a penetrating the first flange 103, and the strip opening 204a extends to the installation In the groove 202a, a water stop plate 204b is slidably connected in the strip opening 204a and cooperates with the L-shaped opening 201a, a wedge block 204c is provided on the water stop plate 204b, and a vertical opening 204d cooperating with the wedge block 204c is provided on the first sealing plate 202b; the movable component 205 includes a mounting tube 205a fixedly connected to the water stop plate 204b, a moving disk 205b is slidably connected in the mounting tube 205a, and the moving disk 205b is elastically connected to the inner wall of the mounting tube 205a through a second spring 205c, and the wedge block 204c passes through the mounting tube 205a and is fixedly connected to the moving disk 205b.

[0033] It should be noted that the left side wall of the extension block 203c here is close to the extension groove 203a, so that the second sealing plate 203d can only deflect toward the second pipe 102, and cannot deflect toward the first pipe 101, so that the medium (here refers to the water or hot air recovered by waste heat, the same below) is not blocked when the medium enters the second pipe 102 from the first pipe 101, but is blocked when the second pipe 102 enters the first pipe 101. The setting of the vertical opening 204d enables the wedge block 204c to block the first sealing plate 202b from moving downward. The sealing plate 202b has an upward movable area, which can relieve the pressure in the first pipe 101 or the second pipe 102, and further avoid the sealing between the first flange 103 and the second flange 104 due to excessive pressure. The setting of the wedge block 204c here can avoid the problem that the wedge block 204c and the first sealing plate 202b cannot be loosened. When in use, the second spring 205c has a large elasticity, which can avoid the first sealing plate 202b from sliding due to gravity problems.

[0034] When in use, in the initial position, the wedge block 204c is in the vertical opening 204d, and the upper end surface of the wedge block 204c is against the inner top of the vertical opening 204d, and the first spring 202c is in a compressed state, and the water stop plate 204b closes the L-shaped opening 201a to prevent the medium from flowing from the L-shaped opening 201a. At this time, when the pressure in the first pipeline 101 or the second pipeline 102 is too large, the pressure pushes the first sealing plate 202b to move upward, the first spring 202c continues to contract, and the setting of the vertical opening 204d makes the first sealing plate 202b move upward. When the first sealing plate 202b moves upward, the pressure in the first pipe 101 and the second pipe 102 can be relieved, thereby preventing the pressure from being too high and affecting the stability of the seal between the first flange 103 and the second flange 104. At this time, since the medium flows from the first pipe 101 into the second pipe 102, the plurality of second sealing plates 203d are opened, and the torsion springs are elastic. The torsion springs here have a relatively small elastic force, and the second sealing plate 203d will not be unable to be opened due to the relatively small pressure in the first pipe 101. When leakage occurs between the sealing rings on the first flange 103 and the second flange 104, it is only necessary to move the water stop plate 204b so that the water stop plate 204b slides to the left on the strip opening 204a, so that the installation cylinder 205a moves to the left, driving the moving plate 205b to move, so that the wedge block 204c is separated from the vertical opening 204d. At this time, under the action of the first spring 202c, the first sealing plate 202b enters the first pipeline 101 to seal the first pipeline 101, and at the same time, the water stop plate 204b moves to the left, so that the L-shaped opening 204a is opened. 1a is opened, and the medium flows out from the L-shaped opening 201a instead of the original path, so that switching without stopping is realized and the use of the overall equipment is not affected. When the medium flows from the L-shaped opening 201a to the second pipe 102, the second sealing plate 203d automatically resets under the action of the torsion spring due to the lack of pressure from the first pipe 101, so that the multiple second sealing plates 203d reset to seal the second pipe 102, avoiding the medium from moving from the second pipe 102 to the joint between the first pipe 101 and the second pipe 102, so that the sealing effect is better.

[0035] In summary, when leakage occurs at the connection between the first pipeline 101 and the second pipeline 102, that is, when the sealing ring between the first flange 103 and the second flange 104 leaks, it is only necessary to move the water stop plate 204b to achieve the closure of the connection between the first pipeline 101 and the second pipeline 102, allowing the medium to flow from the L-shaped opening 201a to the second pipeline 102, avoiding the connection between the first pipeline 101 and the second pipeline 102, thereby achieving pipeline switching without stopping the machine.

[0036] Example 2

[0037] Reference Figure 1 to Figure 6 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a switching component 300 for a pipe joint for a waste heat recovery device in the production of activated alumina, which solves the problem of how to simultaneously move multiple water stop plates 204b and how to reset the first sealing plate 202b. It includes a transmission assembly 301, including an opening 301a that penetrates the installation groove 202a and the first flange 103, a U-shaped rod 301b is penetrated and slidably connected in the opening 301a, the U-shaped rod 301b is fixedly connected to the first sealing plate 202b, a circular ring 301c is rotatably connected to the first flange 103, an expansion ring 301d is provided on the circular ring 301c, and a plurality of first arcs are provided on the expansion ring 301d shaped groove 301e, a first guide rod 301f cooperating with the first arc groove 301e is fixedly connected to the U-shaped rod 301b, and the distance between the first arc groove 301e and the circular ring 301c decreases in a clockwise direction along the expansion ring 301d; the toggle assembly 302 includes a plurality of second arc grooves 302a arranged on the inner wall of the circular ring 301c, a second guide rod 302b is slidably connected in the second arc groove 302a, the water stop plate 204b passes through the first flange 103 and is sealed and slidably connected to the first flange 103, the second guide rod 302b is fixedly connected to the water stop plate 204b, and the distance between the second arc groove 302a and the first flange 103 increases in a clockwise direction along the circular ring 301c.

[0038] It should be noted that the length of the vertical side of the U-shaped rod 301b is greater than the length of the first sealing plate 202b, thereby ensuring that there is sufficient length to push the first sealing plate 202b into the first pipe 101, and the distance between the first arc groove 301e and the ring 301c decreases in a clockwise direction along the expansion ring 301d, so that when the expansion ring 301d is rotated clockwise, the U-shaped rod 301b can be driven to move toward the ring 301c, and the distance between the second arc groove 302a and the first flange 103 increases in a clockwise direction along the ring 301c, so that when the ring 301c rotates clockwise, the second guide rod 302b moves away from the first flange 103.

[0039] During use, when the L-shaped mouth 201a needs to discharge the medium, it is only necessary to rotate the ring 301c clockwise. When the ring 301c is rotated clockwise, the second arc groove 302a moves to drive the second guide rod 302b to move away from the first flange 103, so that the water stop plate 204b moves outward, so that the L-shaped mouth 201a opens. When the ring 301c rotates, it can drive the expansion ring 301d to rotate clockwise, so that the first arc groove 301e moves to drive the first guide rod 301f to move toward the direction of the ring 301c, and the U-shaped rod 301b moves toward the direction of the ring 301c, so that the first sealing plate 202b moves into the first pipe 101, and multiple first sealing plates 202b cooperate to close the first pipe 101, so that the medium enters the L-shaped mouth 201a.

[0040] In summary, when the ring 301c is rotated, the first arc groove 301e and the second arc groove 302a can be moved at the same time. On the one hand, it can drive the water stop plate 204b to move so that the L-shaped mouth 201a is opened. On the other hand, it can move the first sealing plate 202b into the first pipe 101 to close the right end of the first pipe 101, thereby ensuring that the medium enters the L-shaped mouth 201a.

[0041] Example 3

[0042] Reference Figure 1~Figure 5 , which is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides a switching component 300 of a pipe joint for a waste heat recovery device in the production of activated alumina, which solves the problem of how to prevent the ring 301c from rotating on its own. It includes a hand-shift assembly 303, including a U-shaped seat 303a fixedly connected to the ring 301c, and a shift block 303b is rotatably connected to the U-shaped seat 303a; the anti-loosening assembly 304 includes a receiving port 304a arranged on the shift block 303b, and a screw hole is provided on the inner side wall of the receiving port 304a, a screw rod 304b is threadedly connected to the inner wall of the screw hole, and a turntable is fixedly connected to the outer end of the screw rod 304b.

[0043] It should be noted that the horizontal lengths of the first arc-shaped groove 301 e and the second arc-shaped groove 302 a are equal to the distance between the two bolts 106 , thereby ensuring that the receiving opening 304 a can cooperate with the bolts 106 .

[0044] During use, when it is necessary to limit the ring 301c, it is only necessary to move the block 303b so that the accommodating opening 304a cooperates with the bolt 106, thereby preventing the ring 301c from rotating on its own, and then rotate the turntable to rotate the screw rod 304b so that the side wall of the screw rod 304b abuts against the side wall of the bolt 106, thereby preventing the bolt 106 from detaching from the accommodating opening 304a, and further ensuring the stability of the ring 301c.

[0045] In summary, when it is necessary to limit the position of the ring 301c, it is only necessary to move the block 303b so that the accommodating opening 304a cooperates with the bolt 106, thereby avoiding self-rotation of the ring 301c and ensuring the stability of the water stop plate 204b and the first sealing plate 202b. Furthermore, through the setting of the screw 304b, the accommodating opening 304a and the bolt 106 can be prevented from separating, further ensuring the stability of the ring 301c.

[0046] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0047] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0048] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A pipe joint for a waste heat recovery device in the production of activated alumina, characterized in that: include, A supporting component (100), comprising a first pipe (101), a second pipe (102) arranged on the right side of the first pipe (101), a first flange (103) arranged on the first pipe (101), a second flange (104) arranged on the second pipe (102), threaded holes (105) arranged on the first flange (103) and the second flange (104), and bolts (106) arranged on the second flange (104); A bypass component (200) comprises a pipeline component (201) arranged in the first flange (103), a first sealing component (202) arranged on the first flange (103), a second sealing component (203) arranged on the second flange (104), a limiting component (204) arranged on the limiting component, and a movable component (205) arranged on the limiting component (204); The switching component (300) comprises a transmission component (301) arranged on the closing component, a toggle component (302) arranged on the limit component (204), a hand-shift component (303) arranged on the toggle component (302), and an anti-loosening component (304) arranged on the hand-shift component (303); The pipeline assembly (201) comprises two L-shaped openings (201a) arranged on the first flange (103) and the second flange (104); an inner groove (201b) is provided at the joint of the two L-shaped openings (201a); and a sealing strip (201c) is provided in the inner groove (201b); The first sealing component (202) comprises a plurality of mounting grooves (202a) arranged on the inner wall of the first flange (103), a first sealing plate (202b) being arranged in each of the plurality of mounting grooves (202a), the plurality of first sealing plates (202b) being combined into a disc having a diameter equal to the inner diameter of the first pipe (101), the width of the mounting groove (202a) being greater than the depth of the L-shaped opening (201a), and the sealing plate being elastically connected to the inner wall of the mounting groove (202a) via a first spring (202c); The second sealing component (203) comprises a plurality of extension grooves (203a) arranged on the inner walls of a plurality of L-shaped openings (201a) on the second flange (104); a rotating shaft (203b) is rotatably connected in each of the plurality of extension grooves (203a); a torsion spring is provided on the rotating shaft (203b); an extension block (203c) is fixedly connected to the rotating shaft (203b); a second sealing plate (203d) is fixedly connected to the extension block (203c); and the plurality of second sealing plates (203d) are combined into a disk having a diameter equal to that of the second pipe (102); The limiting assembly (204) comprises a strip opening (204a) penetrating the first flange (103), the strip opening (204a) extending into the mounting groove (202a), a water stop plate (204b) matching with the L-shaped opening (201a) being slidably connected in the strip opening (204a), a wedge block (204c) being provided on the water stop plate (204b), and a vertical opening (204d) matching with the wedge block (204c) being provided on the first sealing plate (202b); The movable component (205) comprises a mounting tube (205a) fixedly connected to the water stop plate (204b), a moving disk (205b) slidably connected inside the mounting tube (205a), the moving disk (205b) being elastically connected to the inner wall of the mounting tube (205a) via a second spring (205c), and the wedge block (204c) passes through the mounting tube (205a) and is fixedly connected to the moving disk (205b); The transmission assembly (301) comprises an opening (301a) penetrating the mounting groove (202a) and the first flange (103); a U-shaped rod (301b) penetrates and is slidably connected in the opening (301a); the U-shaped rod (301b) is fixedly connected to the first sealing plate (202b); a circular ring (301c) is rotatably connected to the first flange (103); an expansion ring (301d) is provided on the circular ring (301c); a plurality of first arc grooves (301e) are provided on the expansion ring (301d); a first guide rod (301f) matched with the first arc groove (301e) is fixedly connected to the U-shaped rod (301b); and the distance between the first arc groove (301e) and the circular ring (301c) decreases in sequence in a clockwise direction along the expansion ring (301d).

2. The pipe joint for the waste heat recovery device in the production of activated alumina according to claim 1, characterized in that: The toggle assembly (302) comprises a plurality of second arc grooves (302a) arranged on the inner wall of the circular ring (301c); a second guide rod (302b) is slidably connected in the second arc groove (302a); the water stop plate (204b) passes through the first flange (103) and is sealingly slidably connected to the first flange (103); the second guide rod (302b) is fixedly connected to the water stop plate (204b); and the distance between the second arc groove (302a) and the first flange (103) increases in sequence in a clockwise direction along the circular ring (301c).

3. The pipe joint for the waste heat recovery device in the production of activated alumina according to claim 2, characterized in that: The hand-shift assembly (303) comprises a U-shaped seat (303a) fixedly connected to the circular ring (301c), and a shift block (303b) is rotatably connected to the U-shaped seat (303a).

4. The pipe joint for the waste heat recovery device in the production of activated alumina according to claim 3, characterized in that: The anti-loosening component (304) comprises a receiving opening (304a) arranged on the shifting block (303b), a screw hole is provided on the inner side wall of the receiving opening (304a), a screw rod (304b) is threadedly connected to the inner thread of the screw hole, and a rotating disk is fixedly connected to the outer end of the screw rod (304b).

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