A chemical pipeline welding auxiliary device

Abstract

The present invention provides a chemical pipeline welding auxiliary device, belonging to the field of pipeline welding. It includes a support frame. Both ends of the support frame are provided with placement mechanisms for placing chemical pipelines. The middle of the support frame is provided with an annular seat for the chemical pipeline to be inserted. Welding grooves for the welding torch to enter are opened on both sides of the middle section of the annular seat. The placement mechanism includes a semi-circular base, a semi-circular top seat and a pressing seat. The semi-circular base is fixedly arranged on the top of the support frame through a connecting seat. The semi-circular top seat is arranged directly above the semi-circular base. A pressing cylinder is connected between the semi-circular top seat and the support frame. The pressing seat is slidably connected to the inner circumferential surface of the semi-circular top seat along the circumferential direction of the semi-circular top seat. A pressing gasket is arranged on the side of the pressing seat away from the semi-circular top seat. A driving mechanism for driving the pressing seat to slide is arranged on the support frame. The present invention can facilitate the welding process of the pipeline, and at the same time improve the welding efficiency and welding quality.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline welding, and more particularly to an auxiliary device for chemical pipeline welding. Background Art

[0002] Chemical pipelines are the links connecting equipment in a chemical production line. When the distance between equipment is long, multiple pipelines need to be welded together. Since the pipelines are cylindrical, the weld seams need to be welded annularly along the pipe openings. For pipelines with a large diameter, currently, generally mechanical hoisting or manual hoisting methods are used to align the ends of two pipelines and then welding is carried out.

[0003] When welding the left and right sides of the pipeline, the staff can operate only by standing on both sides of the pipeline. When welding the top of the pipeline, the staff needs to stand above the pipeline with the help of external tools to operate; when welding the bottom of the pipeline, the staff needs to lie under the pipeline to operate, which is very inconvenient and affects the welding efficiency and welding quality. Summary of the Invention

[0004] The purpose of the present invention is to provide an auxiliary device for chemical pipeline welding, which can facilitate the welding process of the pipeline, and at the same time improve the welding efficiency and welding quality.

[0005] An embodiment of the present invention is realized through the following technical solutions: An auxiliary device for chemical pipeline welding includes a support frame. Both ends of the support frame are provided with placement mechanisms for placing chemical pipelines. The middle part of the support frame is provided with an annular seat for inserting a chemical pipeline. Welding grooves for a welding torch to enter are opened on both sides of the middle section of the annular seat. The placement mechanism includes a semi-circular base, a semi-circular top seat, and a pressing seat. The semi-circular base is fixedly arranged on the top of the support frame through a connecting seat.

[0006] The semi-circular top seat is arranged directly above the semi-circular base, and a pressing cylinder is connected between the semi-circular top seat and the support frame. The pressing seat is slidably connected to the inner circumferential surface of the semi-circular top seat along the circumferential direction of the semi-circular top seat. A pressing gasket is arranged on the side of the pressing seat away from the semi-circular top seat. A driving mechanism for driving the pressing seat to slide is arranged on the support frame.

[0007] Further, a plurality of

[0008] rollers that can fit with the chemical pipeline are distributed along the circumferential direction of the inner circumferential surface of the semi-circular base. A plurality of balls that can fit with the pressing seat are distributed along the circumferential direction of the inner circumferential surface of the semi-circular top seat.

[0009] Further, the driving mechanism includes a driving rod, the driving rod is fixedly arranged on the pressing seat along the radial direction of the pressing seat, a through groove for the driving rod to slide is formed on the semi-circular top seat, a sliding seat is arranged at one end of the driving rod away from the pressing seat, and an arc-shaped sliding rail for the sliding seat to slide is arranged on the support frame. The arc-shaped sliding rail is concentric with the semi-circular top seat, and a driving component for driving the sliding seat to slide along the length direction of the arc-shaped sliding rail is arranged at the center position of the top of the support frame.

[0010] At the center position of the top of the support frame, the driving component includes a driving seat, the driving seat is fixedly arranged at the center position of the top of the support frame, a chute is formed in the driving seat along its own length direction, a lead screw is rotatably arranged in the chute, a driving motor is arranged at one end of the driving seat, and the output shaft of the driving motor is coaxially connected with the lead screw. A slider is slidably arranged in the chute, and sliding rods capable of abutting against the sliding seat and driving the sliding seat to slide are arranged on both sides of the slider.

[0011] Further, the sliding seat includes a first support, a second support and a third support. The first support is slidably arranged in the arc-shaped sliding rail, and limiting flanges are arranged on both sides of the first support. The second support is horizontally arranged on the side of the first support facing the driving rod, and a jack for the driving rod to pass through is formed on the second support. The third support is vertically arranged on the side of the first support away from the driving rod, and a strip-shaped groove is formed in the third support along its own length direction. The sliding rod is arranged in the strip-shaped groove and can slide along the length direction of the strip-shaped groove.

[0012] Further, the support frame includes a top frame and a bottom frame. Lifting cylinders are arranged at the four corners of the top of the bottom frame, and the piston rods of the lifting cylinders are fixedly connected to the top frame. The semi-circular base is fixedly arranged on the top frame. Support seats are arranged at both ends of the bottom frame, and a first placement groove for the semi-circular base to be placed in is formed in the support seats.

[0013] Further, two pipeline placement seats are arranged on the bottom frame and between the two support seats. The projections of the two pipeline placement seats on the horizontal plane are respectively located on both sides of the annular seat. Second placement grooves for chemical pipelines to be placed are formed in the pipeline placement seats.

[0014] Further, slopes are arranged on the sides of the two support seats away from each other, and a pipeline groove for the chemical pipeline to be pushed into is formed at the center position of the inclined surface of the slope.

[0015] Further, the driving rod is fixedly arranged on the pressing seat along the radial direction of the pressing seat. A through groove for the driving rod to slide is formed on the semi-circular top seat. A sliding seat is arranged at the end of the driving rod away from the pressing seat. An arc-shaped sliding rail for the sliding seat to slide is arranged on the support frame. The arc-shaped sliding rail is concentric with the semi-circular top seat. A driving component for driving the sliding seat to slide along the length direction of the arc-shaped sliding rail is arranged at the center position of the top of the support frame.

[0016] Further, the driving component includes a driving seat. The driving seat is fixedly arranged at the center position of the top of the support frame. A chute is formed in the driving seat along its own length direction. A lead screw is rotatably arranged in the chute. A driving motor is arranged at one end of the driving seat. The output shaft of the driving motor is coaxially connected with the lead screw. A slider is slidably arranged in the chute. Sliding rods capable of abutting against the sliding seat and driving the sliding seat to slide are arranged on both sides of the slider.

[0017] Further, a guiding groove is formed on the inner circumferential surface of the semi-circular top seat along its circumferential direction, a guiding strip is arranged on the outer circumferential surface of the pressing seat, the guiding strip is slidably arranged in the guiding groove, and the cross-sections of the guiding strip and the guiding groove are both T-shaped.

[0018] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0019] 1. By arranging rollers in the semi-circular base and balls in the semi-circular top seat of the present invention, pressing the chemical pipeline through the pressing seat and slidably connecting the pressing seat in the semi-circular top seat, and driving the pressing seat to slide in the semi-circular top seat through the driving mechanism, the chemical pipeline can be driven to rotate, so that the positions of the top and bottom of the chemical pipeline move to both sides, thus facilitating the welding process of the entire circumferential surface of the end of the chemical pipeline.

[0020] 2. By arranging the support frame as a liftable support frame composed of a top frame, a bottom frame and a lifting cylinder, when it is necessary to put the chemical pipeline in and take it out, the placing mechanism and the annular seat can be moved downward to be close to the ground, so as to facilitate the process of putting the chemical pipeline in and taking it out before and after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the overall structure of the chemical pipeline welding auxiliary device provided by the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the support frame of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the placing mechanism of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the semi-circular top seat and the pressing seat of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the driving mechanism of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the sliding seat of the present invention;

[0028] Icon: 1 - Support frame, 11 - Top frame, 12 - Bottom frame, 13 - Lifting cylinder, 14 - Support seat, 141 - First placement groove, 15 - Pipe placement seat, 151 - Second placement groove, 16 - Ramp, 161 - Pipe groove, 2 - Placement mechanism, 21 - Semi - circular base, 211 - Connecting seat, 212 - Roller, 22 - Semi - circular top seat, 221 - Ball, 222 - Through - slot, 223 - Guide groove, 23 - Pressing seat, 231 - Pressing gasket, 232 - Guide bar, 24 - Pressing cylinder, 3 - Ring seat, 31 - Welding groove, 32 - Connecting plate, 4 - Driving mechanism, 41 - Driving rod, 42 - Sliding seat, 421 - First support, 4211 - Limiting stop, 422 - Second support, 423 - Third support, 4231 - Strip - shaped groove, 43 - Arc - shaped slide rail, 44 - Driving assembly, 441 - Driving seat, 442 - Lead screw, 443 - Driving motor, 444 - Slide block, 445 - Slide bar. Detailed implementation mode

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0031] Embodiment 1

[0032] The following is a reference Figures 1-6 As shown, it will be further described in combination with specific embodiments. Referring to Figure 1 As shown, the present invention is a chemical pipeline welding auxiliary device, including a support frame 1. Placement mechanisms 2 for placing chemical pipelines are provided at both ends of the support frame 1. A ring seat 3 for inserting chemical pipelines is provided in the middle of the support frame 1. The ring seat 3 is welded to the support frame 1 through a connecting plate 32. Welding grooves 31 for the welding torch to enter are provided on both sides of the middle section of the ring seat 3. Place the two chemical pipelines to be welded on two groups of placement mechanisms 2 respectively, and insert the mutually - approaching ends of the two chemical pipelines into the ring seat 3. Adjust the distance between the two chemical pipelines, and then pass the welding torch through the welding grooves 31 on both sides of the ring seat 3 to perform welding operations on the two chemical pipelines.

[0033] Refer to Figure 2As shown, the support frame 1 includes a bottom frame 12 and a top frame 11 located directly above the bottom frame 12. Support seats 14 are provided at both ends of the bottom frame 12 and are placed on the ground through the support seats 14. Lifting cylinders 13 are installed at the four corners of the top of the bottom frame 12, and the piston rods of the lifting cylinders 13 are fixedly connected to the top frame 11. Starting multiple lifting cylinders 13 simultaneously to drive the top frame 11 to move downward can enable the placing mechanism 2 and the annular seat 3 to move downward simultaneously, facilitating the placement of the chemical pipeline onto the placing mechanism 2 and the annular seat 3. After the chemical pipeline is placed, starting multiple lifting cylinders 13 simultaneously to drive the top frame 11 to move upward can drive the chemical pipeline to be lifted by a specified height, facilitating the welding process.

[0034] Refer to Figure 1 、 Figure 3 As shown, the placing mechanism 2 includes a semi-circular base 21, a semi-circular top seat 22, and a pressing seat 23. The semi-circular base 21 is fixedly connected to the bottom surface of the top frame 11 through a connecting seat 211. A first placement groove 141 for the semi-circular base 21 to be placed in is provided on the support seat 14. When the lifting cylinder 13 drives the top frame 11 to move downward to the lowest position, the bottom end of the semi-circular base 21 enters the first placement groove 141. The semi-circular top seat 22 is located directly above the semi-circular base 21. A pressing cylinder 24 is connected between the semi-circular top seat 22 and the support frame 1. The pressing seat 23 is slidably connected to the inner circumferential surface of the semi-circular top seat 22 along the circumferential direction of the semi-circular top seat 22. A pressing gasket 231 for pressing against the outer wall of the chemical pipeline is provided on the side of the pressing seat 23 away from the semi-circular top seat 22. Driving the top frame 11 to move downward by the lifting cylinder 13 to make the bottom end of the semi-circular base 21 enter the first placement groove 141, then pushing the chemical pipeline to the semi-circular base 21 and continuing to push to make one end of the chemical pipeline enter the specified position of the annular seat 3, and then starting the pressing cylinder 24 to drive the semi-circular base 21 to move downward, so that the pressing gasket 231 on the pressing seat 23 presses against the outer wall of the chemical pipeline, thus realizing the fixation of the position of the chemical pipeline.

[0035] Refer to Figure 1 、 Figure 2As shown, slopes 16 are provided on the sides of the two support seats 14 away from each other, facilitating the staff to push the chemical pipeline from the ground onto the support seats 14. A pipeline groove 161 for pushing the chemical pipeline is opened at the center of the inclined surface of the slope 16. Align the top end of the chemical pipeline with the pipeline groove 161 and push it in to ensure that the chemical pipeline is located at the center of the slope 16, facilitating the chemical pipeline after being pushed into to enter the semi-circular base 21 on the support seat 14. On the chassis 12 and between the two support seats 14, there are two pipeline placement seats 15. The projections of the two pipeline placement seats 15 on the horizontal plane are respectively located on both sides of the annular seat 3. A second placement groove 151 for placing the chemical pipeline is opened on the pipeline placement seat 15. When pushing the chemical pipeline towards the pipeline placement seat 15, the end of the chemical pipeline first reaches the second placement groove 151 of the pipeline placement seat 15, and then passes through the second placement groove 151 to reach the annular seat 3. The pipeline placement seat 15 can play a certain supporting role for the middle section of the chemical pipeline, facilitating the process of the end of the chemical pipeline entering the annular seat 3.

[0036] Refer to Figure 1 、 Figure 3 As shown in

[0037] Refer to Figure 3 、 Figure 4As shown in the figure, a guiding groove 223 is formed on the inner circumferential surface of the semi-circular top seat 22 along its circumferential direction. A guiding strip 232 is provided on the outer circumferential surface of the pressing seat 23. The guiding strip 232 is slidably arranged in the guiding groove 223 to ensure that the sliding track of the pressing seat 23 in the semi-circular top seat 22 is consistent with the circumferential direction of the semi-circular top seat 22. In this embodiment, the cross-sections of both the guiding strip 232 and the guiding groove 223 are T-shaped to improve the stability of the guiding strip 232 in the guiding groove 223. In other embodiments, the cross-sections of the guiding strip 232 and the guiding groove 223 can also be arranged in a dovetail shape, which can also ensure the stability of the guiding strip 232 in the guiding groove 223.

[0038] Referring to Figure 1 、 Figure 5 As shown in the figure, the driving mechanism 4 includes a driving rod 41. The driving rod 41 is fixedly connected to the pressing seat 23 along the radial direction of the pressing seat 23. A through groove 222 for the driving rod 41 to slide is formed on the semi-circular top seat 22. A sliding seat 42 is provided at one end of the driving rod 41 away from the pressing seat 23. An arc-shaped sliding rail 43 for the sliding seat 42 to slide is provided on the support frame 1. The arc-shaped sliding rail 43 is concentric with the semi-circular top seat 22. A driving component 44 for driving the sliding seat 42 to slide along the length direction of the arc-shaped sliding rail 43 is provided at the central position of the top of the support frame 1. The driving component 44 drives the sliding seat 42 to slide along the length direction of the arc-shaped sliding rail 43, that is, it can drive the driving rod 41 to drive the pressing seat 23 to rotate along the circumferential direction of the semi-circular top seat 22, so as to drive the chemical pipeline to rotate in the placing mechanism 2.

[0039] Referring to Figure 5 As shown in the figure, the driving component 44 includes a driving seat 441. The driving seat 441 is fixedly arranged at the central position of the top of the support frame 1. A chute is formed in the driving seat 441 along its length direction. A lead screw 442 is rotatably arranged in the chute. A driving motor 443 is arranged at one end of the driving seat 441 and the output shaft of the driving motor 443 is coaxially connected with the lead screw 442. A slider 444 is slidably arranged in the chute. Slide rods 445 capable of abutting against the sliding seat 42 and driving the sliding seat 42 to slide are arranged on both sides of the slider 444. Starting the driving motor 443 drives the lead screw 442 to rotate, and the slider 444 can move along the length direction of the chute, so that the slide rods 445 drive the sliding seat 42 to move along the length direction of the arc-shaped sliding rail 43.

[0040] Referring to Figure 5 、 Figure 6As shown in the figure, the sliding seat 42 includes a first support 421, a second support 422 and a third support 423. The first support 421 is slidably arranged in the arc-shaped slide rail 43. Limit shims 4211 are provided on both sides of the first support 421 to improve the position of the first support 421 in the arc-shaped slide rail 43. The second support 422 is horizontally welded to the side of the first support 421 facing the drive rod 41. A jack for the drive rod 41 to pass through is provided on the second support 422. The third support 423 is vertically welded to the side of the first support 421 away from the drive rod 41. A strip-shaped groove 4231 is provided on the third support 423 along its own length direction. The slide rod 445 is arranged in the strip-shaped groove 4231 and can slide along the length direction of the strip-shaped groove 4231. The slide rod 445 can apply a thrust to the third support 423, so that the third support 423 drives the first support 421 to slide along the length direction of the arc-shaped slide rail 43. During the sliding process, due to the setting of the strip-shaped groove 4231, the slide rod 445 can adapt to the change in the height of the first support 421 in the arc-shaped slide rail 43. During the process of the second support 422 sliding with the first support 421, it can drive the pressing seat 23 to rotate along the circumferential direction of the semi-circular top seat 22 through the drive rod 41, so as to realize the rotation process of the chemical pipeline.

[0041] The working process of this embodiment is as follows: A plurality of lifting cylinders 13 are started simultaneously to drive the top frame 11 to move downward, driving the placing mechanism 2 and the annular seat 3 to move downward simultaneously and making the bottom end of the semi-circular base 21 enter the first placing groove 141. The staff pushes the chemical pipeline from the ground along the slope direction of the slope 16 into the semi-circular base 21 located in the first placing groove 141, and continues to push the chemical pipeline so that the chemical pipeline passes through the second placing groove 151 and reaches the annular seat 3. The pipeline placing seat 15 can play a certain supporting role for the middle section of the chemical pipeline to facilitate the end of the chemical pipeline to enter the designated position of the annular seat 3.

[0042] The pressing cylinder 24 is started to drive the semi-circular base 21 to move downward, so that the pressing gasket 231 on the pressing seat 23 presses against the outer wall of the chemical pipeline, that is, the position of the chemical pipeline is fixed. A plurality of lifting cylinders 13 are started simultaneously to drive the top frame 11 to move upward, that is, the chemical pipeline can be lifted upward by a specified height, and then the welding torch is used to weld both sides of the chemical pipeline through the welding groove 31 in the middle section of the annular seat 3.

[0043] After the two sides of the chemical pipeline are welded, the drive mechanism 4 is used to drive the pressing seat 23 to slide in the semi-circular top seat 22, that is, the positions of the top and bottom of the chemical pipeline can be moved to both sides, so as to facilitate the welding process of the entire circumferential end face of the chemical pipeline.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A chemical pipeline welding auxiliary device, comprising a support frame (1). Both ends of the support frame (1) are provided with placement mechanisms (2) for placing chemical pipelines. The middle part of the support frame (1) is provided with an annular seat (3) into which the chemical pipeline can be inserted. Welding grooves (31) for the welding torch to enter are opened on both sides of the middle section of the annular seat (3). It is characterized in that: The placement mechanism (2) includes a semi-circular base (21), a semi-circular top base (22), and a pressing base (23). The semi-circular base (21) is fixedly arranged on the top of the support frame (1) through a connecting seat (211). The semi-circular top base (22) is arranged directly above the semi-circular base (21), and a pressing cylinder (24) is connected between the semi-circular top base (22) and the support frame (1). The pressing base (23) is slidably connected to the inner circumferential surface of the semi-circular top base (22) along the circumferential direction of the semi-circular top base (22). A pressing gasket (231) is arranged on the surface of the pressing base (23) away from the semi-circular top base (22). A driving mechanism (4) for driving the sliding of the pressing base (23) is arranged on the support frame (1); The support frame (1) includes a top frame (11) and a bottom frame (12). Lifting cylinders (13) are arranged at the four corners of the top of the bottom frame (12). The piston rods of the lifting cylinders (13) are fixedly connected to the top frame (11). The semi-circular base (21) is fixedly arranged on the top frame (11). Support seats (14) are arranged at both ends of the bottom frame (12). A first placement groove (141) for placing the semi-circular base (21) is formed in the support seats (14); The driving mechanism (4) includes a driving rod (41). The driving rod (41) is fixedly arranged on the pressing base (23) along the radial direction of the pressing base (23). A through groove (222) for the driving rod (41) to slide is formed in the semi-circular top base (22). A sliding seat (42) is arranged at the end of the driving rod (41) away from the pressing base (23). An arc-shaped slide rail (43) for the sliding seat (42) to slide is arranged on the support frame (1). The arc-shaped slide rail (43) is concentric with the semi-circular top base (22). A driving component (44) for driving the sliding seat (42) to slide along the length direction of the arc-shaped slide rail (43) is arranged at the central position of the top of the support frame (1); The driving component (44) includes a driving seat (441). The driving seat (441) is fixedly arranged at the central position of the top of the support frame (1). A chute is formed in the driving seat (441) along its own length direction. A lead screw (442) is rotatably arranged in the chute. A driving motor (443) is arranged at one end of the driving seat (441), and the output shaft of the driving motor (443) is coaxially connected with the lead screw (442). A slider (444) is slidably arranged in the chute. Slide rods (445) capable of abutting against the sliding seat (42) and driving the sliding seat (42) to slide are arranged on both sides of the slider (444); The sliding seat (42) includes a first support (421), a second support (422) and a third support (423). The first support (421) is slidably arranged in the arc-shaped slide rail (43). Limit flanges (4211) are arranged on both sides of the first support (421). The second support (422) is horizontally arranged on the side of the first support (421) facing the driving rod (41). A jack for the driving rod (41) to pass through is formed in the second support (422). The third support (423) is vertically arranged on the side of the first support (421) away from the driving rod (41). A strip-shaped groove (4231) is formed in the third support (423) along its own length direction. The slide rod (445) is arranged in the strip-shaped groove (4231) and can slide along the length direction of the strip-shaped groove (4231). A plurality of rollers (212) capable of being attached to the chemical pipeline are distributed along the circumferential direction of the inner circumferential surface of the semi-circular base (21). A plurality of balls (221) capable of being attached to the pressing seat (23) are distributed along the circumferential direction of the inner circumferential surface of the semi-circular top seat (22). A guiding groove (223) is formed in the inner circumferential surface of the semi-circular top seat (22) along its own circumferential direction. A guiding strip (232) is arranged on the outer circumferential surface of the pressing seat (23). The guiding strip (232) is slidably arranged in the guiding groove (223). The cross-sections of the guiding strip (232) and the guiding groove (223) are both T-shaped.

2. The chemical pipeline welding auxiliary device according to claim 1, wherein: Two pipeline placing seats (15) are arranged on the chassis (12) and between the two support seats (14). The projections of the two pipeline placing seats (15) on the horizontal plane are respectively located on both sides of the annular seat (3). A second placing groove (151) for placing the chemical pipeline is formed in the pipeline placing seat (15).

3. The chemical pipeline welding auxiliary device according to claim 1, characterized in that: Slopes (16) are arranged on the sides of the two support seats (14) away from each other. A pipeline groove (161) for pushing the chemical pipeline in is formed at the center of the inclined surface of the slope (16).

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