Coating finishing device for insulation pipe production line

Abstract

The present invention provides a coating finishing device for an insulated pipe production line, comprising a bracket, a slide, a fixed outer cover, a grinding roller, and a negative pressure collection module. The bracket has a limiting slide groove at the top. The slide slides in the slide groove. The fixed outer cover is fixed to the protruding end of the slide, and has a accommodating cavity that opens toward the pipe to be trimmed, with arc-shaped contact portions at both ends of the accommodating cavity. Air outlets are provided at the upper and lower ends of the fixed outer cover. The fixed outer cover also has an outlet. The negative pressure collection module is connected to the outlet and can suck out the insulation layer powder formed in the fixed outer cover through the action of negative pressure. After the fixed outer cover of the coating finishing device for an insulated pipe production line provided by the present invention abuts the insulation layer, the fixed outer cover has only two air outlets that are connected to the outside world. The negative pressure collection module applies negative pressure to the accommodating cavity, and air flows through the two air outlets into the accommodating cavity, thereby sucking out the fallen insulation layer powder at the outlet, thereby ensuring the collection of the insulation layer powder.

Description

Technical Field

[0001] The invention belongs to the technical field of production and processing of thermal insulation pipes, and particularly relates to a coating finishing device for a thermal insulation pipe production line. Background Art

[0002] The insulated pipe is composed of a steel pipe (working pipe) that transports the medium, polyurethane rigid foam (insulation layer), and a high-density polyethylene outer sleeve (outer protective layer). The insulated pipe undergoes the following steps: loading, spraying the insulation layer, and wrapping the outer protective layer. After the polyurethane rigid foam is sprayed on the outer wall of the steel pipe, the free expansion of the foam can cause the outer wall of the insulation layer to be uneven, or the outer wall of the insulation layer cannot form a regular base circle. Therefore, the insulation layer needs to be trimmed after spraying.

[0003] In the prior art, finishing the insulation layer typically involves installing a vertical finishing machine after the spraying process. This finishing machine features a grinding roller on top. Once the grinding roller contacts the insulation layer, it advances and rotates horizontally as the steel pipe is fed, finishing the outer surface of the insulation layer. However, the grinding roller scrapes off a significant amount of insulation powder during operation. This powder falls to the ground, causing environmental pollution, or adheres to the insulation layer, making the subsequent outer protective layer unstable and impractical. Summary of the Invention

[0004] An embodiment of the present invention provides a coating finishing device for an insulation pipe production line, aiming to solve the problem of poor practicality of the insulation layer finishing device used in the existing insulation pipe production due to the inability to process powder.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a coating finishing device for an insulation pipe production line, comprising:

[0006] The bracket has a horizontally arranged limiting slide groove at the top;

[0007] A slide is slidably arranged in the slide groove, with one end extending out of the slide groove; the slide is connected to the telescopic structure arranged in the limiting slide groove;

[0008] A fixed outer cover is fixedly mounted on the protruding end of the slide, and the fixed outer cover has a receiving cavity with an opening facing the pipe to be trimmed; arc-shaped contact portions capable of contacting the outer wall surface of the insulation layer are respectively provided on both sides of the receiving cavity along the axial direction of the pipe to be trimmed; air outlets capable of communicating with the receiving cavity are respectively provided at both ends of the fixed outer cover in the vertical direction; and a guide outlet is provided on the side wall of the fixed outer cover away from the opening;

[0009] A grinding roller is rotatably arranged in the accommodating cavity, with its rotation axis arranged along the axial direction of the pipe to be trimmed; the grinding roller is connected to a driving structure;

[0010] The negative pressure collection module is connected to the outlet and is used to suck out the insulation layer powder formed in the fixed outer cover through the action of negative pressure.

[0011] In a possible implementation, the telescopic structure is a self-locking hydraulic cylinder.

[0012] In a possible implementation, the driving structure includes:

[0013] A driving motor is fixed on the fixed outer cover and has a power output end whose axis is parallel to the axis of the grinding roller;

[0014] The chain drive is respectively connected to the power output end of the driving motor and the rotating shaft of the grinding roller.

[0015] In a possible implementation, the outlet is located below the grinding roller.

[0016] In a possible implementation, the fixed outer cover includes:

[0017] The cover body has an open cavity, which serves as the accommodating cavity; arcuate edges are provided on both sides of the open cavity along the axis of the pipe to be trimmed; the cover body is rotatably connected to the planer roller; hinge shafts are provided on both sides of the cover body along the axis of the pipe to be trimmed; and notches are provided at both ends of the cover body in the vertical direction, communicating with the open cavity.

[0018] There are two variable arc-shaped pieces, and the two variable arc-shaped pieces are respectively connected to the two hinge shafts; the two variable arc-shaped pieces are respectively the two arc-shaped contact parts;

[0019] Two baffle structures are provided, and the two baffle structures are respectively arranged at the two notches, and each baffle structure is enclosed with the outer wall of the insulation layer to form the air outlet; the two baffle structures are respectively connected to the top and bottom ends of each variable arc-shaped piece, and each baffle structure is used to maintain the opening of the air outlet and simultaneously adjust the curvature of the variable arc-shaped piece;

[0020] There are two sealing structures, which are located on both sides of the cover body along the axial direction of the pipe to be trimmed, and are respectively arranged corresponding to the two variable arc-shaped pieces, for sealing the gap between the variable arc-shaped piece and the arc-shaped edge.

[0021] In a possible implementation, each of the articulated shafts and the axis of the grinding roller are spaced apart in the horizontal direction.

[0022] In a possible implementation, each of the sealing structures includes:

[0023] There are two fixing bars, which are respectively fixed on the two outer side walls of the cover along the axial direction of the pipe to be trimmed;

[0024] There are two rubber sheets, and the two rubber sheets are respectively arranged in one-to-one correspondence with the two fixing strips. One end of each rubber sheet is connected to the fixing strip, and the other end is connected to the corresponding variable arc sheet.

[0025] In a possible implementation, the base circle on which the outer peripheral surface of the grinding roller is located is tangent to the arc-shaped edge.

[0026] In a possible implementation, each of the baffle structures includes:

[0027] A fixed box is fixedly mounted on the top or bottom of the cover body; the fixed box has a sliding cavity communicating with the open cavity; the sliding cavity is arranged along the radial direction of the arc-shaped edge;

[0028] A slide plate is slidably disposed in the slide cavity, and one end of the slide plate extends into the notch of the accommodating cavity; an auxiliary block is provided on the slide plate, and an auxiliary rod is connected to the auxiliary block. The auxiliary rod is arranged parallel to the rotating shaft of the grinding roller, and the two ends of the auxiliary rod respectively abut against the two variable arc-shaped pieces;

[0029] The adjusting screw is threadedly connected to the fixing box, and one end of the adjusting screw is inserted into the sliding cavity and is rotatably connected to the sliding plate, and is used for rotating to drive the sliding plate to slide.

[0030] In a possible implementation, both ends of each of the variable arc-shaped pieces are provided with arc-shaped folding portions.

[0031] In this implementation, the support and carriage cooperate to support the fixed housing and maintain a certain height, allowing the axis of the grinding roller to be horizontally coplanar with the axis of the pipe to be trimmed. This reduces the displacement of the grinding roller to a certain extent, while ensuring that the curved contact portion of the fixed housing contacts the insulation layer of the pipe to be trimmed. Driven by the telescopic structure, the carriage moves, allowing for adjustment of the position of the fixed housing and grinding roller, and thus adjusting the grinding diameter. The drive mechanism drives the grinding roller to rotate, thereby trimming the insulation layer and ensuring a satisfactory trimming effect. The fixed outer cover is provided with a accommodating cavity. After the fixed outer cover can abut against the insulation layer of the pipe to be trimmed, only the air outlets at the upper and lower ends are connected to the outside world. At this time, as the negative pressure collection module is negatively pressurized, the air flow enters the accommodating cavity through the two air outlets and flows out at the outlet. During the flow of the air flow, the powder scraped off by the grinding roller will be brought out, which effectively prevents the formed powder from polluting the workshop environment, and also prevents some powder from adhering to the insulation layer, thereby ensuring the subsequent processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of a coating finishing device for an insulation pipe production line provided by an embodiment of the present invention;

[0033] Figure 2 A schematic top view of a coating finishing device for an insulation pipe production line according to an embodiment of the present invention;

[0034] Figure 3 for Figure 1 An enlarged structural diagram of point A of a coating finishing device for an insulation pipe production line provided in an embodiment;

[0035] Figure 4 for Figure 1 An enlarged structural diagram of point B of the coating finishing device for an insulation pipe production line provided in an embodiment;

[0036] Figure 5 This is a schematic diagram of the main structure of a coating finishing device for an insulation pipe production line provided by an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 10. Bracket; 11. Limiting slide;

[0039] 20. Slide;

[0040] 30. Telescopic structure;

[0041] 40. Fixed outer cover; 41. Cover body; 411. Accommodating cavity; 412. Notch; 413. Guide outlet; 414. Air outlet; 415. Hinge shaft; 42. Variable arc piece; 421. Arc-shaped folding portion; 43. Baffle structure; 431. Fixed box; 432. Slide plate; 433. Adjusting screw; 434. Auxiliary block; 435. Auxiliary rod; 44. Sealing structure; 441. Fixing strip; 442. Rubber sheet;

[0042] 50. Grinding roller;

[0043] 60. Drive structure; 61. Driver; 62. Chain drive;

[0044] 70. Negative pressure collection module. DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] Please also refer to Figure 1 、 Figure 2 as well as Figure 5 The coating finishing device for an insulation pipe production line provided by the present invention will now be described. The coating finishing device for an insulation pipe production line comprises a bracket 10, a slide 20, a fixed outer cover 40, a grinding roller 50, and a negative pressure collection module 70. The top of the bracket 10 is provided with a horizontally arranged limiting slide 11. The slide 20 is slidably arranged in the slide, with one end extending out of the slide. The slide 20 is connected to a telescopic structure 30 arranged in the limiting slide 11. The fixed outer cover 40 is fixed to the extended end of the slide 20 and has a receiving chamber 411 that is open to the pipe to be trimmed. Arc-shaped contact portions that can contact the outer wall surface of the insulation layer are respectively provided on both sides of the receiving chamber 411 along the axial direction of the pipe to be trimmed. Air outlets 414 that can communicate with the receiving chamber 411 are respectively provided at both ends of the fixed outer cover 40 in the vertical direction. An outlet 413 is provided on the side wall of the fixed outer cover 40 away from the opening. The grinding roller 50 is rotatably mounted within the accommodating chamber 411, with its axis of rotation aligned along the axis of the pipe to be trimmed. The grinding roller 50 is connected to a drive mechanism 60. A negative pressure collection module 70 is connected to the outlet 413, which uses negative pressure to draw out the insulation powder formed within the fixed housing 40.

[0047] The specific working process is as follows: after the insulation layer is applied to the outer wall of the steel pipe and the insulation layer cools and solidifies, the conveying device moves the insulation-coated steel pipe to a predetermined position. At this time, the telescopic structure 30 drives the slide 20 to move outward, so that the arc-shaped contact portion on the fixed outer cover 40 contacts the insulation layer, and the grinding roller 50 contacts the insulation layer. The drive structure 60 is then activated, driving the grinding roller 50 to rotate, while the conveying device drives the insulation-coated steel pipe to rotate, and the conveying device gradually moves forward to trim the insulation layer. During this process, after the fixed outer cover 40 contacts the insulation layer, only the air outlets 414 at the upper and lower ends of the fixed outer cover 40 are connected to the outside world. At this time, the negative pressure collection module 70 applies negative pressure to the accommodating chamber 411, and air flows into the accommodating chamber 411 through the two air outlets 414, thereby sucking out the fallen insulation powder at the outlet 413.

[0048] In this embodiment, the negative pressure collection module 70 may be an industrial dust collection device, which is a prior art and will not be described in detail here.

[0049] Compared to the prior art, the coating finishing device for an insulated pipe production line provided in this embodiment features a support bracket 10 and a slide 20 that cooperate to ensure support for the fixed outer cover 40 and maintain a certain height, allowing the axis of the grinding roller 50 to be horizontally coplanar with the axis of the pipe to be trimmed. This, in turn, reduces the displacement of the grinding roller 50 to a certain extent while ensuring that the arcuate contact portion of the fixed outer cover 40 contacts the insulation layer of the pipe to be trimmed. Driven by the telescopic structure 30, the slide 20 can move, ensuring adjustment of the position of the fixed outer cover 40 and the grinding roller 50, and thus the adjustment of the grinding diameter. The drive structure 60 can drive the grinding roller 50 to rotate, thereby trimming the insulation layer and ensuring a satisfactory trimming effect. The fixed outer cover 40 is provided with a accommodating chamber 411. After the fixed outer cover 40 is in contact with the insulation layer of the pipe to be repaired, only the air outlets 414 at the upper and lower ends are connected to the outside world. At this time, as the negative pressure collection module 70 generates negative pressure, the air flow enters the accommodating chamber 411 through the two air outlets 414 and flows out at the outlet 413. During the flow of the air flow, the powder scraped off by the grinding roller 50 will be brought out, which effectively prevents the formed powder from polluting the workshop environment, and also prevents some powder from adhering to the insulation layer, thereby ensuring the subsequent processing effect.

[0050] In some embodiments, the telescopic structure 30 may be configured as follows: Figure 2 See the structure shown. Figure 2 , the telescopic structure 30 is a self-locking hydraulic cylinder.

[0051] The setting of the self-locking hydraulic cylinder can ensure that the grinding roller 50 is away from the insulation layer before grinding to avoid interference. At the same time, it can also ensure that the positions of the fixed outer cover 40 and the grinding roller 50 are fixed, thereby ensuring the finishing effect of the insulation layer.

[0052] In some embodiments, the driving structure 60 may be configured as follows: Figure 1 and Figure 2 See the structure shown. Figure 1 and Figure 2 The drive structure 60 includes a drive motor 61 and a chain drive 62. The drive motor 61 is fixed to the fixed housing 40 and has a power output end whose axis is parallel to the axis of the grinding roller 50. The chain drive 62 is connected to the power output end of the drive motor 61 and the rotating shaft of the grinding roller 50.

[0053] The combination of the drive motor 61 and the chain drive 62 can ensure that power is generated and transmitted to the grinding roller 50 at a certain distance.

[0054] In some embodiments, the outlet 413 may be configured as follows: Figure 1 See the structure shown. Figure 1The outlet 413 is located below the grinding roller 50. This structure can ensure that the powder falling by gravity can be completely collected, thereby ensuring the powder collection effect.

[0055] In some embodiments, the fixed cover 40 may be Figure 1 and Figure 3 See the structure shown. Figure 1 and Figure 3 The fixed outer cover 40 includes a cover body 41, an adjustable curved sheet, a baffle structure 43 and a sealing structure 44. The cover body 41 has an open cavity, which is a receiving cavity 411. Curved edges are provided on both sides of the open cavity along the axial direction of the pipe to be trimmed. The cover body 41 is rotatably connected to the planer roller 50. Hinge shafts 415 are provided on both sides of the cover body 41 along the axial direction of the pipe to be trimmed. Notches 412 communicating with the open cavity are provided at both ends of the cover body 41 in the vertical direction. Two variable curved sheets 42 are provided, and the two variable curved sheets 42 are respectively connected to the two hinge shafts 415. The two variable curved sheets 42 are respectively two arc-shaped contact parts. Two baffle structures 43 are provided, and the two baffle structures 43 are respectively arranged at the two notches 412. Each baffle structure 43 and the corresponding notch 412 are enclosed to form an air outlet 414. Two baffle structures 43 are connected to the top and bottom ends of each variable curved piece 42, respectively. Each baffle structure 43 maintains the opening of the air outlet 414 and simultaneously adjusts the curvature of the variable curved piece 42. Two sealing structures 44 are provided. These two sealing structures 44 are located on either side of the cover body 41 along the axis of the pipe to be trimmed, and are respectively arranged corresponding to the two variable curved pieces 42, thereby sealing the gap between the variable curved piece 42 and the curved edge.

[0056] There are different specifications when it comes to the production process of insulated pipes. The main difference lies in the thickness of the insulation layer or the diameter of the pipe, which involves the difference in outer diameter.

[0057] To this end, variable arc-shaped pieces 42 are respectively provided on both sides of the cover body 41 in the axial direction of the pipe to be trimmed, and the midpoint of the arc-shaped piece is connected to the corresponding hinge shaft 415. The parts extending outward at both ends of the variable arc-shaped piece 42 with the hinge shaft 415 as the center can be bent to adjust the curvature, thereby adapting to insulation layers of different diameters, enhancing adaptability, and at the same time ensuring that powder overflow can be avoided for pipes to be trimmed of different specifications.

[0058] Specifically, the housing 41 serves as the base for the fixed outer housing 40. Its open cavity serves as a housing 411, ensuring installation and connection for the drive motor 61, chain drive 62, and grinding roller 50. Notches 412 are provided at the top and bottom of the housing 41, communicating with the open cavity. These notches 412, combined with the baffle structure 43, form an air outlet 414. The air outlet 413 is also located on the housing 41, at its bottom. Along the axis of the pipe to be trimmed, the two edges of the open cavity are curved, corresponding to the maximum diameter of the pipe to be trimmed. Two variable curved blades 42 are located on either side of the housing 41, corresponding to the two curved edges. Adjustment by the two baffle structures 43 allows the curvature of the two variable curved blades 42 to be adjusted, gradually reducing the diameter of the base circle relative to the diameter of the curved edge, ensuring compatibility with insulation layers applied to different steel pipes and providing strong adaptability. Of course, during this process, the deformation of the variable curved sheet 42 will inevitably create a gap with the corresponding curved edge. At this time, the sealing structure 44 can block this gap, effectively preventing air leakage, thereby ensuring the effective removal of powder generated during the grinding of the thermal insulation layer. Of course, the adjustment of the variable curved sheet 42 is carried out by the baffle structure 43. As the baffle structure 43 moves the variable curved sheet 42 outward, as the variable curved sheet 42 moves away from the notch 412, the newly formed opening (the displacement of the notch 412 and the end of the variable curved sheet 42) will increase. At this time, the baffle structure 43 can also further cover this opening, thereby ensuring that the opening of the air outlet 414 is maintained, preventing it from being too large, thereby ensuring the effective collection of powder from the thermal insulation layer.

[0059] It should also be noted that the variable arc-shaped piece 42 has a certain width, which can ensure the relative sliding effect with the insulation layer and avoid damage to the insulation layer.

[0060] In some embodiments, the hinge shaft 415 may be configured as follows: Figure 4 See the structure shown. Figure 4 , each hinge shaft 415 and the axis of the grinding roller 50 are arranged at intervals in the horizontal direction. This structure can ensure that the connection point between the variable arc piece 42 and the hinge shaft 415 is located in the middle position of the variable arc piece 42, thereby ensuring that the variable arc piece 42 is affected by the two baffle structures 43. The bending on both sides can remain consistent, thereby adapting to the trimming specifications of the insulation layer and ensuring the trimming effect.

[0061] In some embodiments, the sealing structure 44 may be formed as follows: Figure 1 See the structure shown. Figure 1Each sealing structure 44 includes a fixing bar 441 and a rubber sheet 442. Two fixing bars 441 are provided, fixed to the two outer side walls of the housing 41 along the axis of the pipe to be trimmed. Two rubber sheets 442 are provided, corresponding one to each fixing bar 441. One end of each rubber sheet 442 is connected to the fixing bar 441, and the other end is connected to the corresponding variable arc sheet 42.

[0062] The fixing strip 441 can ensure that one end of the rubber sheet 442 is fixed so that it can be stably fixed on the outer wall of the cover body 41, and the other end of the rubber sheet 442 is connected to the variable arc sheet 42. After the variable arc sheet 42 is squeezed and deformed, the rubber sheet 442 can be pulled, and the rubber sheet 442 is deformed and extended, which can seal the gap formed between the variable arc sheet 42 and the arc edge, which effectively avoids air leakage here, so as to ensure that during the collection process of the insulation layer powder, the external airflow only flows into the air outlet 414 at the upper and lower ends of the cover body 41, thereby ensuring the powder collection effect.

[0063] In this embodiment, the rubber sheet 442 may be latex recycled rubber.

[0064] In some embodiments, the grinding roller 50 may be Figure 1 and Figure 4 See the structure shown. Figure 1 and Figure 4 The base circle where the outer peripheral surface of the grinding roller 50 is located is tangent to the arc edge.

[0065] This structure ensures that after the arc edge or variable arc piece 42 abuts the insulation layer, the grinding roller 50 can abut against the outer wall surface of the insulation layer, which can effectively ensure the grinding effect and also prevent the variable arc piece 42 from excessively squeezing the insulation layer.

[0066] In some embodiments, the baffle structure 43 may be formed as follows: Figure 3 See the structure shown. Figure 3 Each baffle structure 43 includes a fixed box 431, a slide 432 and an adjusting screw 433. The fixed box 431 is fixed to the top or bottom of the cover body 41. The fixed box 431 has a sliding cavity connected to the open cavity. The sliding cavity is arranged along the radial direction of the arc edge. The slide 432 is slidably arranged in the sliding cavity, and one end extends into the notch 412 of the accommodating cavity 411. An auxiliary block 434 is provided on the slide 432, and an auxiliary rod 435 is connected to the auxiliary block 434. The auxiliary rod 435 is arranged parallel to the rotating shaft of the grinding roller 50, and the two ends of the auxiliary rod 435 respectively abut on the two variable arc pieces 42. The adjusting screw 433 is threadedly connected to the fixed box 431, and one end extends into the sliding cavity and is rotatably connected to the slide 432, and can rotate to drive the slide 432 to slide.

[0067] By rotating the adjustment screw 433, the slide 432 is driven to move. As the slide 432 approaches the tube to be trimmed, it gradually enters the open cavity of the housing 41, maintaining the opening of the air outlet 414. Simultaneously, the slide 432 pushes the ends of the two variable curved pieces 42 via the auxiliary rod 435, causing them to deform and gradually reduce their curvature. This structure ensures that the deformation of the adjustable curved pieces can be adjusted, while also ensuring that it can accommodate tubes of varying sizes to be trimmed, and provides convenient adjustment.

[0068] In some embodiments, the variable arc piece 42 may be formed as follows: Figure 1 and Figure 3 See the structure shown. Figure 1 and Figure 3 Each variable arc piece 42 is provided with an arc-shaped folding portion 421 at both ends. The arc-shaped folding portion 421 can prevent the insulation layer from being scratched during the relative rotation with the pipe to be trimmed, and can also prevent the auxiliary rod 435 from being separated from the variable arc piece 42 during the process of squeezing and pushing the variable arc piece 42. It has a simple structure and strong practicality.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coating finishing device for an insulation pipe production line, characterized in that: include: The bracket has a horizontally arranged limiting slide groove at the top; A slide is slidably arranged in the slide groove, with one end extending out of the slide groove; the slide is connected to the telescopic structure arranged in the limiting slide groove; and a tube connecting the dischar e side of the pump with a plug in the forward end of the crank case, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end. Two baffle structures are provided, and the two baffle structures are respectively arranged at the two notches, and each baffle structure and the outer wall of the insulation layer enclose the air outlet; the two baffle structures are respectively connected to the top and bottom ends of each variable arc-shaped piece, and each baffle structure is used to maintain the opening of the air outlet and simultaneously adjust the curvature of the variable arc-shaped piece; There are two sealing structures, which are respectively located on both sides of the cover body along the axial direction of the pipe to be trimmed and are respectively arranged corresponding to the two variable arc-shaped pieces, for sealing the gap between the variable arc-shaped piece and the arc-shaped edge; A grinding roller is rotatably mounted on the cover and located in the accommodating cavity, wherein the rotation axis of the grinding roller is arranged along the axis direction of the pipe to be trimmed; the grinding roller is connected to a driving structure; The negative pressure collection module is connected to the outlet and is used to suck out the insulation layer powder formed in the fixed outer cover through the action of negative pressure.

2. The coating finishing device for the insulation pipe production line according to claim 1, characterized in that: The telescopic structure is a self-locking hydraulic cylinder.

3. The coating finishing device for the insulation pipe production line according to claim 1, characterized in that: The driving structure includes: A driving motor is fixed on the fixed outer cover and has a power output end whose axis is parallel to the axis of the grinding roller; The chain drive is respectively connected to the power output end of the driving motor and the rotating shaft of the grinding roller.

4. The coating finishing device for an insulation pipe production line according to any one of claims 1 to 3, characterized in that: The guide outlet is located below the grinding roller.

5. The coating finishing device for the insulation pipe production line according to claim 1, characterized in that: Each of the hinge shafts and the axis of the grinding roller is spaced apart in the horizontal direction.

6. The coating finishing device for an insulation pipe production line according to claim 1, characterized in that: Each of the sealing structures comprises: There are two fixing bars, which are respectively fixed on the two outer side walls of the cover along the axial direction of the pipe to be trimmed; There are two rubber sheets, and the two rubber sheets are respectively arranged in one-to-one correspondence with the two fixing strips. One end of each rubber sheet is connected to the fixing strip, and the other end is connected to the corresponding variable arc sheet.

7. The coating finishing device for an insulation pipe production line according to claim 1, characterized in that: The base circle where the outer peripheral surface of the grinding roller is located is tangent to the arc-shaped edge.

8. The coating finishing device for an insulation pipe production line according to claim 1, characterized in that: Each of the baffle structures comprises: A fixed box is fixedly mounted on the top or bottom of the cover body; the fixed box has a sliding cavity communicating with the open cavity; the sliding cavity is arranged along the radial direction of the arc-shaped edge; A slide plate is slidably disposed in the slide cavity, and one end of the slide plate extends into the notch of the accommodating cavity; an auxiliary block is provided on the slide plate, and an auxiliary rod is connected to the auxiliary block. The auxiliary rod is arranged parallel to the rotating shaft of the grinding roller, and the two ends of the auxiliary rod respectively abut against the two variable arc-shaped pieces; The adjusting screw is threadedly connected to the fixing box, and one end of the adjusting screw is inserted into the sliding cavity and is rotatably connected to the sliding plate, and is used for rotating to drive the sliding plate to slide.

9. The coating finishing device for the insulation pipe production line according to claim 8, characterized in that: Both ends of each variable arc-shaped piece are provided with an arc-shaped folding portion.

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