Coating thickness control device

Abstract

The invention relates to the field of steel pipe anti-corrosion layer coating, in particular to a coating thickness control device, and aims to solve the technical problems that in the related technology, the thickness of a pipe body coating exceeds the standard requirement, and the anti-corrosion cost is high. The coating thickness control device comprises a coating mechanism and an auxiliary mechanism, the coating mechanism comprises a pressing roller, a rotating speed measuring piece and a first rotating driving assembly, the first rotating driving assembly is in transmission connection with the pressing roller, and the rotating speed measuring piece is used for measuring the rotating speed of the pressing roller; the auxiliary mechanism comprises an auxiliary roller and a second rotary driving assembly, the auxiliary roller and the pressing roller are distributed in parallel, the second rotary driving assembly is in transmission connection with the auxiliary roller and is electrically connected with the rotating speed measuring piece, and the second rotary driving assembly is configured to enable the auxiliary roller to generate instantaneous acceleration under the working condition of welding seam coating. Through the coating thickness control device, the length of the polyethylene membrane can be changed, so that the instantaneous length of the polyethylene membrane is controllable, and the thickness of the polyethylene membrane is changed.

Description

Technical Field

[0001] The invention relates to the field of steel pipe anti-corrosion coating, and in particular to a coating thickness control device. Background Art

[0002] 3PE refers to the polyethylene anti-corrosion layer, the bottom layer is epoxy powder coating, the middle layer is adhesive layer, and the surface layer is polyethylene coating. Polyethylene as the surface material of pipeline 3PE has resistance to organic solvents, high mechanical strength and toughness, and excellent UV resistance and aging resistance.

[0003] Polyethylene is extruded by a screw extruder, and its extrusion state is viscous flow. After being compacted by a roller, it can be evenly wrapped on the surface of the steel pipe. However, when it is applied to a submerged arc welded pipe, especially a straight seam submerged arc welded pipe, because the straight seam submerged arc welded pipe has an outer weld extending along its axial direction, and the outer weld has a certain excess height, when the roller compacts the polyethylene film at the outer weld, the film thickness will be sharply reduced.

[0004] In recent years, with the improvement of pipeline construction standards, the quality standards of anti-corrosion have also been continuously improved, and the coating thickness at the external weld has been increased from no less than 70% of the pipe body thickness to 90%. In this case, the coating thickness requirements at the external weld can only be met by increasing the extrusion volume of polyethylene, but in this way, the overall coating thickness of the pipe body will exceed the standard line, and this will also lead to an increase in polyethylene material consumption, making the anti-corrosion cost high. Summary of the invention

[0005] The purpose of the present invention is to provide a coating thickness control device to alleviate the technical problems in the related art that the coating thickness of the pipe body exceeds the standard requirements and the anti-corrosion cost is high.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0007] The coating thickness control device provided by the present invention comprises: a coating mechanism and an auxiliary mechanism;

[0008] The coating mechanism comprises a pressure roller, a rotation speed measuring member and a first rotation driving assembly, wherein the first rotation driving assembly is transmission-connected to the pressure roller, and the rotation speed measuring member is used to measure the rotation speed of the pressure roller;

[0009] The auxiliary mechanism includes an auxiliary roller and a second rotation drive assembly, wherein the auxiliary roller and the pressure roller are distributed in parallel, the second rotation drive assembly is transmission-connected to the auxiliary roller and electrically connected to the rotation speed measuring component, and the second rotation drive assembly is configured to cause the auxiliary roller to generate instantaneous acceleration under the condition of coating the weld.

[0010] Furthermore, the rotation speed measuring component includes an encoder, and the encoder is connected to the end of the pressure roller.

[0011] Further, the second rotary drive assembly includes a second rotary driver and a second coupling;

[0012] The output shaft of the second rotary driver is connected to one end of the second coupling, and the other end of the second coupling is connected to the auxiliary roller.

[0013] Furthermore, the coating thickness control device also includes a bottom plate;

[0014] The coating mechanism and the auxiliary mechanism are arranged on the upper surface of the bottom plate, and the auxiliary mechanism is slidably matched with the bottom plate and can slide close to or away from the pressure roller in a direction perpendicular to the axis of the pressure roller.

[0015] Furthermore, the coating thickness control device also includes a linear drive component, which is arranged on the base plate and is transmission-connected to the auxiliary mechanism to drive the auxiliary mechanism to slide along a straight line.

[0016] Furthermore, the auxiliary mechanism also includes a movable roller seat;

[0017] The linear drive assembly is transmission-connected to the movable roller seat;

[0018] The movable roller seat is slidably connected to the bottom plate;

[0019] The auxiliary roller is arranged on the movable roller seat, and both ends of the auxiliary roller are rotatably matched with the movable roller seat.

[0020] Furthermore, a slide rail is provided on the bottom plate, and the extension direction of the slide rail is perpendicular to the axis of the pressing roller;

[0021] The movable roller seat is slidably matched with the slide rail.

[0022] Further, the linear drive assembly includes a ball screw and a handwheel;

[0023] In the ball screw, the length direction of the screw is consistent with the extension direction of the slide rail, both ends of the screw are rotatably matched with the bottom plate, and the nut is connected to the movable roller seat;

[0024] The hand wheel is connected to the end of the screw rod.

[0025] Furthermore, the coating thickness control device also includes a lifting drive assembly;

[0026] The lifting drive assembly is in driving connection with the bottom plate, and is configured to drive the bottom plate to lift and lower under coating conditions, so that the pressure roller moves closer to or away from the steel pipe.

[0027] Further, the lifting drive assembly includes a lifting cylinder;

[0028] In the sliding direction of the auxiliary mechanism, one end of the bottom plate close to the auxiliary mechanism is hinged to the ground;

[0029] The lifting cylinder is hinged between one end of the bottom plate close to the coating mechanism and the ground.

[0030] In summary, the coating thickness control device provided by the present invention can achieve the following technical effects:

[0031] The coating thickness control device provided by the present invention comprises a coating mechanism and an auxiliary mechanism; the coating mechanism comprises a pressure roller, a rotation speed measuring device and a first rotation driving component, wherein the first rotation driving component is connected to the pressure roller in a transmission manner, and the rotation speed measuring device is used to measure the rotation speed of the pressure roller; the auxiliary mechanism comprises an auxiliary roller and a second rotation driving component, wherein the auxiliary roller and the pressure roller are distributed in parallel, the second rotation driving component is connected to the auxiliary roller in a transmission manner, and is electrically connected to the rotation speed measuring device, and the second rotation driving component is configured to cause the auxiliary roller to generate instantaneous acceleration under the condition of coating the weld.

[0032] In the device, the auxiliary roller and the pressure roller are arranged in parallel. The auxiliary roller, driven by the second rotary drive component, can move the polyethylene film extruded by the screw extruder along the tangential direction of the steel pipe and guide it to the pressure roller; after the polyethylene film bypasses the auxiliary roller and is transmitted to the pressure roller, the pressure roller, driven by the first rotary drive component, will roll the polyethylene film so that it is wrapped around the surface of the steel pipe, thereby completing the coating.

[0033] During the coating process, the speed measuring device measures the speed of the pressure roller and sends the speed information to the second rotary drive component, which then controls the speed of the auxiliary roller. In the non-weld area, the linear speed of the auxiliary roller is consistent with the linear speed of the pressure roller. In this way, the length of the polyethylene film between the auxiliary roller and the steel pipe remains unchanged at all times and can be evenly wound and compacted to the steel pipe by the pressure roller. When encountering a weld, the auxiliary roller generates instantaneous acceleration, and the linear speed of the auxiliary roller is instantly greater than the linear speed of the pressure roller. In this way, the force of the two rollers pulling the polyethylene film is reduced, which will cause the length of the polyethylene film between the auxiliary roller and the steel pipe to increase instantaneously, thereby increasing the thickness. After being compacted to the steel pipe, the thickness of the coating meets the standard requirements.

[0034] It can be seen that compared with the existing technology, the coating thickness control device can change the length of the polyethylene film under coating conditions, so that its instantaneous length can be controlled, thereby achieving thickness adjustment. After the polyethylene film is compacted at the weld, the coating thickness will not be sharply reduced due to the existence of the weld excess height, which can meet the standard requirements and also reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of an application of a coating thickness control device provided by an embodiment of the present invention;

[0037] Figure 2 A top view of a coating thickness control device provided in an embodiment of the present invention.

[0038] Icon: 100-pressure roller; 200-speed measuring part; 300-auxiliary roller; 400-second rotary drive; 500-bottom plate;

[0039] 600- linear drive assembly; 610- ball screw; 620- handwheel;

[0040] 700-mobile roller seat; 800-slide rail;

[0041] 900-lifting drive assembly; 910-lifting cylinder; 920-fixed hinge;

[0042] 1000-steel pipe; 1100-ground; 1200-fixed roller seat; 1300-screw extruder. DETAILED DESCRIPTION

[0043] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] In recent years, with the improvement of pipeline construction standards, the quality standards of anti-corrosion have also been continuously improved, and the coating thickness at the external weld has been increased from no less than 70% of the pipe body thickness to 90%. In this case, the coating thickness requirements at the external weld can only be met by increasing the extrusion volume of polyethylene, but in this way, the overall coating thickness of the pipe body will exceed the standard line, and this will also lead to an increase in polyethylene material consumption, making the anti-corrosion cost high.

[0047] In view of this, the present invention provides a coating thickness control device, including a coating mechanism and an auxiliary mechanism; the coating mechanism includes a pressure roller 100, a rotation speed measuring device 200 and a first rotation drive component, wherein the first rotation drive component is transmission-connected to the pressure roller 100, and the rotation speed measuring device 200 is used to measure the rotation speed of the pressure roller 100; the auxiliary mechanism includes an auxiliary roller 300 and a second rotation drive component, wherein the auxiliary roller 300 and the pressure roller 100 are distributed in parallel, the second rotation drive component is transmission-connected to the auxiliary roller 300, and is electrically connected to the rotation speed measuring device 200, and the second rotation drive component is configured to cause the auxiliary roller 300 to generate instantaneous acceleration under the condition of coating the weld.

[0048] In the device, the auxiliary roller 300 and the pressure roller 100 are arranged in parallel. Under the drive of the second rotary drive component, the auxiliary roller 300 can move the polyethylene film extruded by the screw extruder 1300 along the tangential direction of the steel pipe 1000 and guide it to the pressure roller 100; after the polyethylene film bypasses the auxiliary roller 300 and is transmitted to the pressure roller 100, the pressure roller 100 will roll the polyethylene film through the drive of the first rotary drive component, so that it is wrapped around the surface of the steel pipe 1000, thereby completing the coating.

[0049] During the coating process, the speed measuring device 200 measures the speed of the pressure roller 100 and sends the speed information to the second rotary drive component, which then controls the speed of the auxiliary roller 300. In the non-weld area, the linear speed of the auxiliary roller 300 is consistent with the linear speed of the pressure roller 100. In this way, the length of the polyethylene film between the auxiliary roller 300 and the steel pipe 1000 remains unchanged at all times and can be evenly wound and compacted to the steel pipe 1000 by the pressure roller 100. When encountering a weld, the auxiliary roller 300 generates instantaneous acceleration. At this time, the linear speed of the auxiliary roller 300 is instantly greater than the linear speed of the pressure roller 100. In this way, the force of the two rollers pulling the polyethylene film is reduced, which will cause the length of the polyethylene film between the auxiliary roller 300 and the steel pipe 1000 to increase instantaneously, thereby increasing the thickness. After being compacted to the steel pipe 1000, the thickness of the coating meets the standard requirements.

[0050] It can be seen that compared with the existing technology, the coating thickness control device can change the length of the polyethylene film under coating conditions, so that its instantaneous length can be controlled, thereby achieving thickness adjustment. After the polyethylene film is compacted at the weld, the coating thickness will not be sharply reduced due to the existence of the weld excess height, which can meet the standard requirements and also reduce costs.

[0051] The following combination Figure 1 and Figure 2 The structure and shape of the coating thickness control device provided in this embodiment are described in detail:

[0052] In one embodiment of the present application, reference Figure 2 The first rotary drive assembly includes a first rotary driver and a first coupling, the output shaft of the first rotary driver is connected to one end of the first coupling, and the other end of the first coupling is connected to the pressure roller 100. The second rotary drive assembly includes a second rotary driver 400 and a second coupling; the output shaft of the second rotary driver 400 is connected to one end of the second coupling, and the other end of the second coupling is connected to the auxiliary roller 300. The rotary driver here can preferably be a servo motor. With such a design, precise control of the rotation of the auxiliary roller 300 and the pressure roller 100 is achieved, while ensuring the response speed when instantaneous acceleration is required, thereby ensuring the coating effect.

[0053] Regarding the rotation speed measuring element 200, specifically:

[0054] The rotation speed measuring element 200 may adopt a rotation speed sensor, such as a Hall type, a magnetoelectric type or a photoelectric type, or an encoder, or other electronic components capable of measuring rotation speed.

[0055] Preferably, an encoder is used here, and the encoder is connected to the end of the pressure roller 100 through a coupling. When the pressure roller 100 rotates, the encoder rotates synchronously, and the rotation speed of the pressure roller 100 is measured and converted into a corresponding pulse value through the PLC, and then sent to the corresponding servo motor. When the servo motor works normally, the auxiliary roller 300 maintains the same linear speed as the pressure roller 100; when the weld arrives, the PLC outputs a pulse value exceeding the pulse value measured by the encoder to the servo motor, causing it to accelerate, and the auxiliary roller 300 generates instantaneous acceleration, changing the length of the polyethylene film. It should be pointed out that the acceleration pulse value of the servo motor is manually input on the touch screen, and the input value can be flexibly adjusted according to the size of the required compensation amount.

[0056] For further reference, Figure 1 and Figure 2 The coating thickness control device also includes a bottom plate 500; the coating mechanism and the auxiliary mechanism are arranged on the upper surface of the bottom plate 500, and the auxiliary mechanism is slidably matched with the bottom plate 500, and can slide toward or away from the pressure roller 100 in a direction perpendicular to the axis of the pressure roller 100.

[0057] Continue to refer Figure 1 and Figure 2 The coating mechanism and the auxiliary mechanism are distributed on the left and right sides. The auxiliary mechanism is slidably connected to the bottom plate 500 and can slide on the bottom plate 500 in the left and right directions to approach or move away from the coating mechanism. During the sliding process of the auxiliary mechanism, the auxiliary roller 300 slides toward or away from the pressing roller 100, and the distance between the two decreases or increases accordingly. In this way, the length change range of the polyethylene film is adjusted, that is, when the distance between the two is relatively small, the length change range of the polyethylene film is small, and correspondingly, the changeable thickness of the polyethylene film is small. When the distance between the two is relatively large, the length change range of the polyethylene film is large, and correspondingly, the changeable thickness of the polyethylene film is large, thereby realizing accurate compensation for welds with different excess heights and improving the application range of the coating thickness control device.

[0058] Regarding auxiliary mechanisms and coating mechanisms, specifically:

[0059] refer to Figure 1 and Figure 2 The auxiliary mechanism also includes a moving roller seat 700. Two slide rails 800 are provided on the bottom plate 500 and are parallel to each other and extend left and right. The moving roller seat 700 and the slide rails 800 are slidably matched. The two ends of the auxiliary roller 300 are fixed to the moving roller seat 700 through bearing seats and can rotate around their own axes. The coating mechanism also includes a fixed roller seat 1200. The fixed roller seat 1200 is fixed to the bottom plate 500. The two ends of the pressure roller 100 are fixed to the fixed roller seat 1200 through bearing seats and can rotate around their own axes.

[0060] In normal use of the coating thickness control device, the spacing between the auxiliary roller 300 and the pressure roller 100 does not need to be adjusted. When replacing with other steel pipes 1000, such as steel pipes 1000 with changed diameters or spiral welds, the roller seat 700 can be adaptively slid and moved to slide left and right on the slide rail 800, thereby synchronously driving the auxiliary roller 300 to move left and right, so that the spacing between the auxiliary roller 300 and the pressure roller 100 is correspondingly reduced or increased, and the range of change of the polyethylene film length is adjusted. With such a design, the device can realize coating of steel pipes 1000 with different diameters, and ensure the accuracy of the coating range, so that the coating thickness meets the corresponding standard requirements.

[0061] For further reference, Figure 1 and Figure 2 The coating thickness control device also includes a linear drive component 600, which is disposed on the bottom plate 500 and is transmission-connected to the auxiliary mechanism to drive the auxiliary mechanism to slide along a straight line to adjust the distance between the auxiliary roller 300 and the pressure roller 100.

[0062] In one embodiment of the present application, continue to refer to Figure 1 and Figure 2 The linear drive assembly 600 includes a ball screw 610 and a hand wheel 620; in the ball screw 610, the length direction of the screw is consistent with the extension direction of the slide rail 800, both ends of the screw are rotatably matched with the base plate 500, and the nut is connected to the movable roller seat 700; the hand wheel 620 is connected to the end of the screw.

[0063] Specifically, the screw is located between the two slide rails 800 and is arranged parallel to the slide rails 800. Both ends of the screw are fixed to the bottom plate 500 through bearing seats respectively; the nut is fixedly connected to the bottom of the movable roller seat 700. In specific application, the hand wheel 620 is first turned, and the screw rotates synchronously therewith. The nut matched with the screw thread starts to move along the axial direction of the screw under the drive of the screw and the restriction of the movable roller seat 700, so that the movable roller seat 700 is driven to slide on the slide rail 800, thereby adjusting the distance between the auxiliary roller 300 and the pressure roller 100, so that the length change range of the polyethylene film is reduced or increased.

[0064] In other embodiments, the linear drive assembly 600 may use a linear drive component, such as a pneumatic cylinder, an electric cylinder, or a linear motor.

[0065] For further reference, Figure 1 The coating thickness control device also includes a lifting drive assembly 900; the lifting drive assembly 900 is transmission-connected to the bottom plate 500, and is configured to drive the bottom plate 500 to rise and fall under the coating condition, so that the pressure roller 100 moves closer to or away from the steel pipe 1000.

[0066] Specifically, Figure 1For example, driven by the lifting drive assembly 900, the bottom plate 500 will be lifted and lowered, and the coating mechanism disposed on the bottom plate 500 will be lifted and lowered synchronously, so that the pressure roller 100 will move up and down, so as to move toward or away from the steel pipe 1000, so as to achieve coating of the steel pipe 1000, or evacuate after coating, so as to facilitate replacement of the steel pipe 1000. In addition, by controlling the rising height of the pressure roller 100, the distance between the pressure roller 100 and the steel pipe 1000 is controlled, so that the coating thickness control device can be applied to steel pipes 1000 of different specifications, thereby increasing the scope of use.

[0067] It should be noted that the lifting here may be that the bottom plate 500 moves up and down along the longitudinal direction as a whole, or one end of the bottom plate 500 is relatively fixed and the other end rotates.

[0068] Preferably, this embodiment adopts the latter, and correspondingly, Figure 1 As shown, the lifting drive assembly 900 includes a lifting cylinder 910; in the sliding direction of the auxiliary mechanism, one end of the base plate 500 close to the auxiliary mechanism is hinged to the ground 1100; the lifting cylinder 910 is hinged between one end of the base plate 500 close to the coating mechanism and the ground 1100.

[0069] Specifically, refer to Figure 1 and Figure 2 The middle of the left end of the bottom plate 500 is hinged to the output end of the lifting cylinder 910 through a fixed hinge 920, and the cylinder body of the lifting cylinder 910 is hinged to the ground 1100 through another fixed hinge 920; the two sides of the right end of the bottom plate 500 are hinged to the ground 1100 through two fixed hinges 920. With this design, when the lifting cylinder 910 is started, the left end of the bottom plate 500 will rotate around the hinge axis of its right end, thereby driving the coating mechanism to rotate synchronously, so that the pressure roller 100 can be lifted and lowered.

[0070] Finally, 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coating thickness control device, characterized in that: include: Coating mechanism and auxiliary mechanism; The coating mechanism comprises a pressure roller (100), a rotation speed measuring component (200) and a first rotation driving component, wherein the first rotation driving component is in transmission connection with the pressure roller (100), and the rotation speed measuring component (200) is used to measure the rotation speed of the pressure roller (100); The auxiliary mechanism comprises an auxiliary roller (300) and a second rotation drive assembly, wherein the auxiliary roller (300) and the pressure roller (100) are arranged in parallel, the second rotation drive assembly is transmission-connected to the auxiliary roller (300) and electrically connected to the rotation speed measuring component (200), and the second rotation drive assembly is configured to cause the auxiliary roller (300) to generate instantaneous acceleration under the condition of coating the weld.

2. The coating thickness control device according to claim 1, characterized in that: The rotation speed measuring component (200) comprises an encoder, and the encoder is connected to the end of the pressing roller (100).

3. The coating thickness control device according to claim 1, characterized in that: The second rotary drive assembly includes a second rotary driver (400) and a second coupling; The output shaft of the second rotary driver (400) is connected to one end of the second coupling, and the other end of the second coupling is connected to the auxiliary roller (300).

4. The coating thickness control device according to claim 1, characterized in that: The coating thickness control device also includes a bottom plate (500); The coating mechanism and the auxiliary mechanism are arranged on the upper surface of the bottom plate (500), and the auxiliary mechanism is slidably matched with the bottom plate (500) and can slide towards or away from the pressure roller (100) in a direction perpendicular to the axis of the pressure roller (100).

5. The coating thickness control device according to claim 4, characterized in that: The coating thickness control device further comprises a linear drive component (600), wherein the linear drive component (600) is arranged on the bottom plate (500) and is transmission-connected with the auxiliary mechanism to drive the auxiliary mechanism to slide along a straight line.

6. The coating thickness control device according to claim 5, characterized in that: The auxiliary mechanism also includes a movable roller seat (700); The linear drive assembly (600) is transmission-connected to the movable roller seat (700); The movable roller seat (700) is slidably connected to the bottom plate (500); The auxiliary roller (300) is arranged on the movable roller seat (700), and both ends of the auxiliary roller are rotatably matched with the movable roller seat (700).

7. The coating thickness control device according to claim 6, characterized in that: A slide rail (800) is provided on the bottom plate (500), and the extension direction of the slide rail (800) is perpendicular to the axis of the pressing roller (100); The movable roller seat (700) is slidably matched with the slide rail (800).

8. The coating thickness control device according to claim 7, characterized in that: The linear drive assembly (600) comprises a ball screw (610) and a hand wheel (620); In the ball screw (610), the length direction of the screw is consistent with the extension direction of the slide rail (800), both ends of the screw are rotatably matched with the bottom plate (500), and the nut is connected to the movable roller seat (700); The hand wheel (620) is connected to the end of the screw rod.

9. The coating thickness control device according to claim 4, characterized in that: The coating thickness control device further comprises a lifting drive component (900); The lifting drive assembly (900) is in driving connection with the bottom plate (500), and is configured to drive the bottom plate (500) to lift and lower under coating conditions, so that the pressure roller (100) moves closer to or away from the steel pipe (1000).

10. The coating thickness control device according to claim 9, characterized in that: The lifting drive assembly (900) comprises a lifting cylinder (910); In the sliding direction of the auxiliary mechanism, one end of the bottom plate (500) close to the auxiliary mechanism is hinged to the ground (1100); The lifting cylinder (910) is hinged between an end of the base plate (500) close to the coating mechanism and the ground (1100).

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