Production line for thin-pipe-diameter polyurethane continuous spraying polyethylene winding thermal insulation pipe

Abstract

The invention relates to the technical field of pipe surface treatment, in particular to a thin-pipe-diameter polyurethane continuous spraying polyethylene winding thermal insulation pipe production line which comprises an industrial personal computer, a first pipe feeding platform, a spraying device, a spraying transmission line, a second pipe feeding platform, a winding transmission line, a polyethylene winding device, a spraying cooling device and a finished product output platform. The output ends and the input ends of the first pipe feeding platform, the spraying transmission line, the second pipe feeding platform, the winding transmission line and the finished product output platform are sequentially connected, the spraying transmission line and the winding transmission line each comprise a plurality of conveying devices which are arranged collinearly, and each conveying device comprises a plurality of supporting wheels. The riding wheels are arranged on the two sides of the conveying axis at intervals in the direction of the conveying axis, and the riding wheels located on the two sides of the conveying axis are arranged in a staggered mode in the extending direction of the conveying axis. The pipe machining device has the effect of being capable of machining pipes with small pipe diameters.

Description

Technical Field

[0001] The present application relates to the technical field of pipe surface treatment, and in particular to a production line for continuous spraying of thin-diameter polyurethane polyethylene wrapped thermal insulation pipes. Background Art

[0002] The steel pipe spray-wound insulation pipe is a new insulation pipe material, which is made by spraying polyurethane on the outside of the steel pipe and then wrapping a polyethylene protective layer. The existing production line transports pipes through two relatively arranged supporting wheels. The supporting wheels usually use rubber tires with a diameter of not less than 400. Support wheels with too small diameters are difficult to provide support for the pipes. By changing the distance between the two supporting wheels to adapt to the diameter of the pipe to be processed, the axis of the pipe can be kept at the same height to adapt to the spraying device and the polyethylene winding device. The minimum diameter of the pipe that can be processed is DN500. On the one hand, the pipe with a diameter less than DN500 will be difficult to be transported on the production line because the two supporting wheels cannot get closer to each other, resulting in insufficient force. On the other hand, due to the small diameter of the pipe, the height of the axis of the pipe is difficult to reach the processing requirement by adjusting the distance between the two supporting wheels. Summary of the invention

[0003] In order to process pipes with smaller diameters, the present application provides a production line for thin-diameter polyurethane continuous spraying polyethylene winding insulation pipes.

[0004] The thin-diameter polyurethane continuous spraying polyethylene winding insulation pipe production line provided in this application adopts the following technical solutions: A production line for continuous spraying of thin-diameter polyurethane polyethylene winding insulation pipes, comprising an industrial computer, a first pipe-mounting platform, a spraying device, a spraying transmission line, a second pipe-mounting platform, a winding transmission line, a polyethylene winding device, a spray cooling device and a finished product output platform, wherein the output ends and input ends of the first pipe-mounting platform, the spraying transmission line, the second pipe-mounting platform, the winding transmission line and the finished product output platform are connected in sequence, the spraying device is arranged on the spraying transmission line, the polyethylene winding device and the spray cooling device are arranged on the winding transmission line, the spraying device, the polyethylene winding device and the spray cooling device are all connected to the industrial computer signal, the spraying transmission line and the winding transmission line both comprise a plurality of co-linearly arranged conveying devices, the conveying device has a conveying axis, the conveying device comprises a plurality of supporting wheels, the supporting wheels are arranged at intervals on both sides of the conveying axis along the direction of the conveying axis, and the supporting wheels located on both sides of the conveying axis are staggered along the extension direction of the conveying axis.

[0005] By adopting the above technical scheme, the staggered tugboats can be closer to each other than the relatively arranged tugboats, so that they can carry pipes with smaller diameters, so that they can move along the axial direction and rotate around their own axial direction at the same time. The first pipe upper platform, spraying device, second pipe upper platform, polyethylene winding device, spray cooling device and finished product output platform can use the same production line equipment as the large-diameter insulation pipes, which reduces the cost of upgrading and transforming the production line, so that the production line can meet the processing requirements of small diameter pipes.

[0006] Optionally, the conveying device also includes a base, a sliding support base, a rotating support base, a fixed wheel frame for mounting the supporting wheel, a sliding drive mechanism and a rotating drive mechanism, the center line of the upper end of the base is the conveying axis, and slopes inclined downward from the outside to the inside are relatively arranged on the base on both sides of the conveying axis, the sliding support base is slidably connected to the slope, and the sliding drive mechanism is drivingly connected to the sliding support base to drive the sliding support base to reciprocate along the inclined direction of the slope toward or away from the conveying axis, the number of the rotating support base is multiple, and the rotating support base The sliding support seats are arranged at intervals along the direction of the transmission axis, and the rotating support seats can be rotatably connected to the sliding support seats around their own axes. The rotating support seats located on both sides of the transmission axis are staggered along the extension direction of the transmission axis. The rotating drive mechanism is drivingly connected to the rotating support seats to drive the rotating support seats to rotate around their own axes so that an angle is formed between the axle of the supporting wheel and the transmission axis. A driving motor is installed on at least part of the fixed wheel frame, and the driving motor is drivingly connected to the supporting wheel, and the driving motor is signal-connected to the industrial computer.

[0007] By adopting the above technical solution, the angle between the tugboat and the transmission axis, as well as the distance between the tugboats on both sides of the transmission axis, are adjusted. When the tugboat driven by the driving motor rotates, the insulation pipe is driven obliquely by friction, and the insulation pipe is subjected to force to move along the axial direction while rotating around its own axis. Since the length and diameter of the pipeline are of specified dimensions, the data are set in the industrial computer. According to the preset parameters, the insulation pipe is sprayed or wound while being transmitted in a straight line and rotating. After the spraying or winding process is completed, the outer diameter of the insulation pipe will increase by a fixed value accordingly. The industrial computer can adjust the subsequent transmission device according to the preset value, change the angle between the tugboat and the transmission axis, as well as the distance between the tugboats on both sides of the transmission axis, to adapt to the insulation pipe with an increased diameter.

[0008] Optionally, a center plane is provided between the two slope surfaces, and the height of the center plane is equal to the height of the lowest position of the slope surface. The sliding drive mechanism includes a first connecting ring, a second connecting ring and an opening and closing cylinder. The first connecting rings are arranged at intervals on the center plane along the direction of the transmission axis, and the second connecting rings are respectively arranged on the sliding support seats and cooperate with the first connecting rings. One end of the opening and closing cylinder is hingedly connected to the first connecting ring, and the other end is hingedly connected to the second connecting ring, and two adjacent opening and closing cylinders are respectively hingedly connected to the second connecting rings located on different sliding support seats, and the opening and closing cylinder is connected to the industrial computer signal.

[0009] By adopting the above technical solution, utilizing the cooperation of the first connecting ring and the second connecting ring and the drive of the opening and closing oil cylinder, the stable sliding of the sliding support seat along the slope is achieved, thereby driving the position adjustment of the supporting wheel.

[0010] Optionally, the side of the slope away from the center plane is arranged on an edge plane, the height of the edge plane is equal to the height of the highest position of the slope, and a limit rod is provided on the base, one end of the limit rod is fixed to the center plane, and the other end is fixed to the edge plane, and two adjacent limit rods are respectively fixed to different edge planes, and the upper end of the sliding support seat abuts against the limit rod.

[0011] By adopting the above technical solution, a limiting rod is provided to limit the upper end of the sliding support seat to prevent it from separating from the base during the sliding process, thereby enhancing the stability of the conveying device.

[0012] Optionally, the opening and closing cylinder is arranged along the inclination angle of the slope.

[0013] By adopting the above technical solution, the opening and closing cylinder is arranged along the inclination angle of the slope, so that when driving the sliding support seat to slide, the applied force can be parallel to the inclination angle of the slope, avoiding the application of a component force perpendicular to the slope, thereby reducing the friction between the support seat and the base, and improving the driving efficiency and stability.

[0014] Optionally, the center position of the wheel axle of the supporting wheel is arranged colinearly with the center axis of the rotating support seat.

[0015] By adopting the above technical solution, the center position of the wheel axle of the support roller and the central axis of the rotating support seat are set to be colinear, so that the rotating support seat will not change the relative distance between the support rollers on both sides of the transmission axis during rotation, which is convenient for adjustment.

[0016] Optionally, the rotation drive mechanism includes a rotating rod, a connecting rod, a sliding frame and a steering cylinder, the rotating rod is perpendicular to the rotating support seat and is arranged on a side of the rotating support seat away from the transmission axis, the connecting rod is provided with a plurality of rings matching the rotating rod, the rotating rod is rotatably connected to the rotating rod through the rings, one end of the connecting rod is provided with a slider matching the sliding frame, the connecting rod is slidably connected to the sliding frame through the slider, the sliding frame is set along the inclination angle of the slope so that the connecting rod can reciprocate along the inclination angle direction of the slope, the steering cylinder is arranged on the sliding support seat and is drivingly connected to the sliding frame to drive the sliding frame to reciprocate along the direction of the transmission axis, and the steering cylinder is connected to the industrial computer signal.

[0017] By adopting the above technical solution, using the cooperation of the rotating rod, connecting rod, sliding frame and steering cylinder, the stable rotation of the rotating support seat is achieved, which in turn drives the rotation of the supporting wheel, so that the required angle can be formed between the wheel axle of the supporting wheel and the transmission axis, thereby improving the flexibility and adaptability of the transmission.

[0018] Optionally, the supporting wheel is made of rubber tire.

[0019] By adopting the above technical solution, rubber tires are selected as support wheels, which not only have good wear resistance and elasticity, but also can effectively reduce noise and vibration during the transmission process, thereby improving the overall operation stability of the production line.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application realizes continuous spraying of thin-diameter polyurethane and winding of polyethylene through a continuous spraying and winding production method, combined with a transmission device with multiple co-linearly arranged supporting wheels on the spraying transmission line and the winding transmission line, thus breaking the technical vacuum that thin-diameter insulation pipes cannot be continuously sprayed and wound; 2. This application uses the cooperation of the sliding drive mechanism and the rotating drive mechanism to enable the support wheel to flexibly adjust the distance and angle, which not only meets the production needs of insulation pipes with different diameters, but also ensures the stability and consistency of the product during the production process, thereby greatly improving the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the layout of a production line for a thin-diameter polyurethane continuous spraying polyethylene winding insulation pipe provided in an embodiment of the present application; Figure 2 is a schematic diagram of the structure of a conveying device provided in an embodiment of the present application; Figure 3 It is a side view of the conveying device provided in an embodiment of the present application.

[0022] Explanation of the reference numerals: 1-first upper tube platform; 2-spraying transmission line; 3-spraying device; 4-second upper tube platform; 5-winding transmission line; 6-polyethylene winding device; 7-spray cooling device; 8-cutting device; 9-finished product output platform; 10-base; 1001-slope; 1002-center plane; 1003-edge plane; 11-sliding support seat; 12-rotating support seat; 13-fixed wheel frame; 14-supporting wheel; 15-driving motor; 16-sliding drive mechanism; 1601-first connecting ring; 1602-second connecting ring; 1603-opening and closing cylinder; 1604-limiting rod; 17-rotating drive mechanism; 1701-turning rod; 1702-connecting rod; 1703-sliding frame; 1704-sliding block; 1705-steering cylinder. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-3 This application is described in further detail.

[0024] The embodiment of the present application discloses a production line for a thin-diameter polyurethane continuous spray-coated polyethylene wrapped thermal insulation pipe.

[0025] like Figure 1 As shown, the production line for continuous spraying of thin-diameter polyurethane polyethylene winding insulation pipes includes an industrial computer, a first pipe loading platform 1, a spraying device 3, a spraying transmission line 2, a second pipe loading platform 4, a winding transmission line 5, a polyethylene winding device 6, a spray cooling device 7 and a finished product output platform 9.

[0026] The input end of the first pipe loading platform 1 is connected to the previous workstation, i.e., the output end of the rust removal transmission line, and receives the pipes treated by the rust removal device. The clean pipes after rust removal are used as raw materials for processing insulation pipes. The output end of the first pipe loading platform 1 is connected to the input end of the spraying transmission line 2, which includes a plurality of co-linearly arranged transmission devices, which can drive the pipes to move along the direction of the transmission line axis and maintain rotation around their own axis direction.

[0027] The spray transmission line 2 includes three groups of conveying devices: an input section, a processing section and an output section. A spraying device 3 is arranged on the spray transmission line 2 in the processing section. The spraying device 3 includes a spray gun arranged in the middle of the processing section. The spray gun is connected to the polyurethane paint conveyor. The polyurethane paint conveyor is connected to the industrial computer signal to control the spraying speed and metering of the polyurethane. Two layers of polyurethane are sprayed. Single-gun continuous spraying or double-gun continuous spraying can be selected according to product specifications. In this embodiment, a double-gun continuous spraying method is adopted; a polyurethane thickness measuring device is also arranged on the spray transmission line 2, so that the outer peripheral surface of the insulation pipe is evenly sprayed with a polyurethane layer after the insulation pipe is transmitted through the spray device 3.

[0028] The output end of the spraying transmission line 2 is connected to the input end of the second upper tube platform 4, and the output end of the second upper tube platform 4 is connected to the input end of the winding transmission line 5. The winding transmission line 5 also includes a plurality of co-linearly arranged transmission devices, which can drive the pipe to move along the direction of the transmission line axis and maintain rotation around its own axis. In order to move the pipe on the spraying transmission line 2 to the second upper tube platform 4, a lever arm (not shown in the figure) can be provided on the spraying transmission line 2.

[0029] A polyethylene winding device 6 and a spray cooling device 7 are provided on the winding transmission line 5. The polyethylene winding device 6 includes a polyethylene extruder. An extrusion die is provided at the discharge port of the polyethylene extruder. The polyethylene winding layer is evenly wrapped around the outer periphery of the polyurethane layer, and then enters the spray cooling device 7 to cool the product. Since the continuous winding of the polyethylene on the insulation pipe will cause the previous insulation pipe to be connected to the next insulation pipe through the polyethylene wound on the outer surface, in order to separate the two adjacent insulation pipes from each other, a cutting device 8 can be provided after the spray cooling device 7. The cutting device 8, the polyethylene extruder and the spray cooling device 7 are all connected to the industrial computer signal.

[0030] The output end of the winding transmission line 5 is connected to the finished product output platform 9 to output the processed polyurethane continuous spray polyethylene winding insulation pipe. In order to move the pipe on the winding transmission line 5 to the finished product output platform 9, a moving arm (not shown in the figure) can also be provided on the winding transmission line 5.

[0031] like Figure 2 and Figure 3As shown, the spraying transmission line 2 is consistent with the structure of multiple transmission devices of the winding transmission line 5. Specifically, these transmission devices include a base 10, a sliding support seat 11, a rotating support seat 12, a fixed wheel frame 13 for mounting a supporting wheel 14, a supporting wheel 14 constructed as a rubber tire, a sliding drive mechanism 16 and a rotating drive mechanism 17. The upper end center line of the base 10 is used as the transmission axis, and the base 10 on both sides of the transmission axis is provided with a relative slope 1001 that is tilted downward from the outside to the inside. There are two sliding support seats 11, both of which are slidably connected to the slope 1001 and are arranged on both sides of the transmission axis. The sliding drive mechanism 16 is connected to the sliding support seat 11 to drive it to reciprocate along the inclination direction of the slope 1001 close to or away from the transmission axis. There are multiple rotating support seats 12, which are arranged between the sliding support seats 11 along the transmission axis and can be rotatably connected to the sliding support seat 11 around its own axis. The rotating support seats 12 located on both sides of the transmission axis are staggered in the extension direction of the transmission axis. The rotation drive mechanism 17 is connected to the rotating support seat 12 to drive it to rotate around its own axis, so that an angle is formed between the wheel axle of the supporting wheel 14 and the transmission axis. At least part of the fixed wheel frame 13 is equipped with a driving motor 15, which is connected to the supporting wheel 14 to drive the supporting wheel 14 to rotate around its own axis. The sliding drive mechanism 16, the rotation drive mechanism 17 and the drive motor 15 are all connected to the industrial computer signal.

[0032] The angle between the tug and the transmission axis and the distance between the tugs on both sides of the transmission axis are adjusted by the industrial computer. When the driving motor 15 drives the tug to rotate, the insulation pipe is driven obliquely by friction. After being subjected to force, the insulation pipe can rotate around its own axis while moving in the axial direction. Since the length and diameter of the pipeline are both specified sizes, these data are pre-recorded in the industrial computer. According to the preset parameters, the insulation pipe is sprayed or wound while being transported in a straight line and rotating. After the processing is completed, the outer diameter of the insulation pipe will increase by a fixed value accordingly. The industrial computer can adjust the subsequent conveying device according to the preset value, change the angle between the tug and the transmission axis and the distance between the tugs on both sides of the transmission axis to adapt to the insulation pipe with an increased diameter.

[0033] like Figure 2 and Figure 3As shown, a center plane 1002 is provided between the two slopes 1001, and the height of the center plane 1002 is equal to the height of the lowest position of the slope 1001. The side of the slope 1001 away from the center plane 1002 is provided with an edge plane 1003, and the height of the edge plane 1003 is equal to the height of the highest position of the slope 1001. The sliding drive mechanism 16 includes a first connecting ring 1601, a second connecting ring 1602, an opening and closing oil cylinder 1603 and a limit rod 1604. The first connecting ring 1601 is arranged at intervals on the central plane 1002 along the direction of the transmission axis. The second connecting ring 1602 is respectively arranged on the sliding support seat 11 and matched with the first connecting ring 1601. One end of the opening and closing oil cylinder 1603 is hingedly connected to the first connecting ring 1601, and the other end is hingedly connected to the second connecting ring 1602. Two adjacent opening and closing oil cylinders 1603 are respectively hingedly connected to the second connecting rings 1602 located on different sliding support seats 11, so that the opening and closing oil cylinder 1603 is arranged along the inclination angle of the slope 1001. In order to control the opening and closing oil cylinder 1603, the opening and closing oil cylinder 1603 can be connected to the industrial computer signal. The limiting rod 1604 is arranged on the base 10 , one end of the limiting rod 1604 is fixed to the central plane 1002 , and the other end is fixed to the edge plane 1003 , and two adjacent limiting rods 1604 are respectively fixed to different edge planes 1003 , and the upper end of the sliding support seat 11 abuts against the limiting rod 1604 .

[0034] When the opening and closing oil cylinder 1603 is working, the opening and closing oil cylinder 1603 can drive the second connecting ring 1602 to approach or move away from the first connecting ring 1601 along the slope 1001, thereby driving the sliding support seat 11 to approach or move away from the first connecting ring 1601 along the slope 1001, thereby realizing the stable sliding of the sliding support seat 11 along the slope 1001, and driving the position adjustment of the supporting wheel 14. The opening and closing oil cylinder 1603 is arranged along the inclination angle of the slope 1001, so that when driving the sliding support seat 11 to slide, the applied force can be parallel to the inclination angle of the slope 1001, avoiding the application of a component force perpendicular to the slope 1001, thereby reducing the friction between the support seat and the base 10, and improving the efficiency and stability of the drive. The limiting rod 1604 can limit the upper end of the sliding support seat 11 to prevent it from detaching from the base 10 during the sliding process, thereby enhancing the stability of the conveying device.

[0035] like Figure 2 and Figure 3As shown, the driving rotation mechanism is composed of a rotating rod 1701, a connecting rod 1702, a sliding frame 1703 and a steering cylinder 1705. The rotating rod 1701 is perpendicular to the rotating support seat 12 and is located on the side away from the transmission axis. A plurality of collars are arranged on the connecting rod 1702, which cooperate with the rotating rod 1701 to realize the rotation connection. A slider 1704 is installed at one end of the connecting rod 1702, which cooperates with the sliding frame 1703, and realizes the sliding connection with the sliding frame 1703 through the slider 1704. The setting angle of the sliding frame 1703 is consistent with the inclination angle of the slope 1001, so that the connecting rod 1702 can reciprocate along the inclination direction of the slope 1001. The steering cylinder 1705 is installed on the sliding support seat 11 and is connected to the sliding frame 1703 to drive the sliding frame 1703 to reciprocate along the transmission axis. The steering cylinder 1705 is connected to the signal system of the industrial computer. The center position of the wheel axle of the supporting wheel 14 is collinear with the center axis of the rotating support seat 12 .

[0036] When the steering cylinder 1705 is working, the steering cylinder 1705 can drive the sliding frame 1703 to move back and forth along the direction of the transmission axis, thereby driving the connecting rod 1702 to move back and forth along the direction of the transmission axis. When the connecting rod 1702 moves, since the rotating rod 1701 is rotatably connected with the collar on the connecting rod 1702, the rotating rod 1701 can drive the rotating support seat 12 to rotate around its own axis under the action of the connecting rod 1702, thereby driving the rotation of the supporting wheel 14, so that the wheel axle of the supporting wheel 14 can form a desired angle with the transmission axis. While the rotating rod 1701 drives the rotating support seat 12 to rotate around its own axis, the rotating rod 1701 will also rotate around the axis of the rotating support seat 12, thereby generating a displacement along the slope 1001, and then causing the connecting rod 1702 to move along the slope 1001. The cooperation between the sliding frame 1703 and the slider 1704 enables the connecting rod 1702 to move along the direction of the transmission axis while also moving along the slope 1001, thereby achieving a guiding effect on the rotating rod 1701.

[0037] The implementation principle of the production line for continuous spraying of thin-diameter polyurethane polyethylene wrapped thermal insulation pipes in the embodiment of the present application is as follows: The pipe diameter range that can be produced in this application is: DN200-900.

[0038] The spraying transmission line 2 includes an input section, a processing section and an output section arranged in a co-linear manner. The rotation speed of the supporting wheels 14 of the input section and the processing section is the slowest, so that the axial transmission speed is the slowest. The rotation speed of the supporting wheels 14 of the output section is slightly greater than the rotation speed of the supporting wheels 14 of the processing section. The first pipe loading platform 1 delivers the insulation pipe to the spraying transmission line 2, and the insulation pipe smoothly enters the processing section from the input section; the insulation pipe continuously passes through the spraying device 3 for polyurethane spraying treatment. After the spraying is completed in the processing section, the insulation pipe enters the output section and moves faster. The insulation pipe of the output section is pushed by the lever arm to enter the second pipe loading platform 4.

[0039] The winding transmission line 5 includes an input section, a processing section and an output section arranged in a co-linear manner. The rotation speed of the supporting wheels 14 of the input section and the processing section is the slowest, so that the axial transmission speed is the slowest. The rotation speed of the supporting wheels 14 of the output section is slightly greater than that of the supporting wheels 14 of the processing section. The second tube loading platform 4 delivers the insulation pipe to the winding transmission line 5, and the insulation pipe smoothly enters the processing section from the input section; the insulation pipe is subjected to polyethylene winding processing on the outer peripheral surface through the polyethylene winding device 6 in the processing section of the winding transmission line 5, and then cooled and shaped through the spray cooling device 7, and finally the excess polyethylene at the end of the insulation pipe is cut off through the cutting device 8; the insulation pipe after cutting enters the output section to accelerate movement, and the insulation pipe of the output section is pushed by the lever arm to enter the finished product output platform 9.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A production line for continuous spraying of polyurethane with a small diameter polyethylene winding insulation pipe, characterized in that: The invention comprises an industrial computer, a first tube-mounting platform (1), a spraying device (3), a spraying transmission line (2), a second tube-mounting platform (4), a winding transmission line (5), a polyethylene winding device (6), a spray cooling device (7) and a finished product output platform (9), wherein the output end and the input end of the first tube-mounting platform (1), the spraying transmission line (2), the second tube-mounting platform (4), the winding transmission line (5) and the finished product output platform (9) are connected in sequence, the spraying device (3) is arranged on the spraying transmission line (2), the polyethylene winding device (6) and the spray cooling device (7) are connected to the output end and the input end of the first tube-mounting platform (1), the spraying transmission line (2), the second tube-mounting platform (4), the winding transmission line (5) and the finished product output platform (9) are connected in sequence, ) is arranged on the winding transmission line (5), the spraying device (3), the polyethylene winding device (6) and the spray cooling device (7) are all connected to the industrial computer signal, the spraying transmission line (2) and the winding transmission line (5) both include a plurality of co-linearly arranged transmission devices, the transmission device has a transmission axis, the transmission device includes a plurality of supporting wheels (14), the supporting wheels (14) are arranged at intervals on both sides of the transmission axis along the direction of the transmission axis, and the supporting wheels (14) located on both sides of the transmission axis are staggered along the extension direction of the transmission axis.

2. The production line for continuous spraying of polyurethane with a small diameter polyethylene winding insulation pipe according to claim 1 is characterized in that: The conveying devices also include a base (10), a sliding support seat (11), a rotating support seat (12), a fixed wheel frame (13) for mounting the supporting wheel (14), a sliding drive mechanism (16) and a rotating drive mechanism (17); the center line of the upper end of the base (10) is the conveying axis; slope surfaces (1001) inclined downward from outside to inside are relatively arranged on the base (10) on both sides of the conveying axis; the sliding support seat (11) is slidably connected to the slope surfaces (1001); the sliding drive mechanism (16) is drivingly connected to the sliding support seat (11) to drive the sliding support seat (11) to reciprocate along the inclined direction of the slope surface (1001) close to or away from the conveying axis; the number of the rotating support seats (12) is multiple, The rotating support seat (12) is arranged at intervals on the sliding support seat (11) along the direction of the transmission axis, and the rotating support seat (12) can be rotatably connected to the sliding support seat (11) around its own axis. The rotating support seats (12) located on both sides of the transmission axis are staggered along the extension direction of the transmission axis. The rotating drive mechanism (17) is drivingly connected to the rotating support seat (12) to drive the rotating support seat (12) to rotate around its own axis so that an angle is formed between the axle of the supporting wheel (14) and the transmission axis. A driving motor (15) is installed on at least part of the fixed wheel frame (13), and the driving motor (15) is drivingly connected to the supporting wheel (14), and the driving motor (15) is connected to the industrial computer signal.

3. The production line for continuous spraying of polyurethane with a small diameter polyethylene winding insulation pipe according to claim 2 is characterized in that: A center plane (1002) is provided between the two slopes (1001), the height of the center plane (1002) is equal to the height of the lowest position of the slope (1001), the sliding drive mechanism (16) comprises a first connecting ring (1601), a second connecting ring (1602) and an opening and closing oil cylinder (1603), the first connecting ring (1601) is arranged at intervals on the center plane (1002) along the direction of the transmission axis, and the second connecting ring (1602) is arranged at intervals on the center plane (1002) along the direction of the transmission axis. It is separately arranged on the sliding support seat (11) and cooperates with the first connecting ring (1601), one end of the opening and closing cylinder (1603) is hingedly connected to the first connecting ring (1601), and the other end is hingedly connected to the second connecting ring (1602), and the two adjacent opening and closing cylinders (1603) are respectively hingedly connected to the second connecting ring (1602) located on different sliding support seats (11), and the opening and closing cylinder (1603) is connected to the industrial computer signal.

4. The production line for continuous spraying of polyurethane with a small diameter polyethylene winding insulation pipe according to claim 3 is characterized in that: The side of the slope (1001) away from the center plane (1002) is arranged on an edge plane (1003), and the height of the edge plane (1003) is equal to the height of the highest position of the slope (1001). A limiting rod (1604) is provided on the base (10), one end of the limiting rod (1604) is fixed to the center plane (1002), and the other end is fixed to the edge plane (1003), and two adjacent limiting rods (1604) are respectively fixed to different edge planes (1003), and the upper end of the sliding support seat (11) is in contact with the limiting rod (1604).

5. The production line for continuous spraying of polyurethane with a small diameter polyethylene winding insulation pipe according to claim 3 is characterized in that: The opening and closing oil cylinder (1603) is arranged along the inclination angle of the slope surface (1001).

6. The production line for continuous spraying of polyurethane with a small diameter polyethylene winding insulation pipe according to claim 2 is characterized in that: The center position of the wheel axle of the supporting wheel (14) is arranged colinearly with the center axis of the rotating support seat (12).

7. The production line for continuous spraying of polyurethane with a small diameter polyethylene winding insulation pipe according to claim 6 is characterized in that: The rotation drive mechanism (17) comprises a rotating rod (1701), a connecting rod (1702), a sliding frame (1703) and a steering cylinder (1705); the rotating rod (1701) is perpendicular to the rotating support seat (12) and is arranged on a side of the rotating support seat (12) away from the transmission axis; the connecting rod (1702) is provided with a plurality of rings matching with the rotating rod (1701); the rotating rod (1701) is rotatably connected to the rotating rod (1701) via the rings; one end of the connecting rod (1702) is provided with a sliding block (1703) matching with the sliding frame (1703). 704), the connecting rod (1702) is slidably connected to the sliding frame (1703) through the slider (1704), the sliding frame (1703) is arranged along the inclination angle of the slope (1001) so that the connecting rod (1702) can reciprocate along the inclination angle direction of the slope (1001), the steering cylinder (1705) is arranged on the sliding support seat (11) and is drivingly connected to the sliding frame (1703) to drive the sliding frame (1703) to reciprocate along the direction of the transmission axis, and the steering cylinder (1705) is connected to the industrial computer signal.

8. The production line for continuous spraying of polyurethane with a small diameter polyethylene winding insulation pipe according to claim 1, characterized in that: The supporting wheel (14) is made of rubber tire.

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