Large diameter polyurethane spray winding insulation pipe belt transmission line and production system and production method

Abstract

The present invention belongs to the technical field of processing polyurethane spray-wrapped thermal insulation pipes, and relates to a belt transmission line for large-diameter polyurethane spray-wrapped thermal insulation pipes, including a base and supporting transmission units evenly distributed at inclined intervals along the length direction of the base, the supporting transmission unit including a base, a bracket, an active roller, a driven roller, a bearing seat and a conveyor belt. The present invention also relates to a production system for large-diameter polyurethane spray-wrapped thermal insulation pipes, wherein a belt transmission line is arranged on the outlet side of the spray chamber, and a tire transmission line is arranged on the inlet side of the spray chamber and at the rear of the belt transmission line. The present invention also relates to a production method for large-diameter polyurethane spray-wrapped thermal insulation pipes. The present invention has the advantages of improving production efficiency, ensuring product quality, saving production costs, facilitating operation, saving manpower and effort, and being easy to implement.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane spray-wound thermal insulation pipe processing, and relates to a polyurethane spray-wound thermal insulation pipe transmission technology, in particular to a large-diameter polyurethane spray-wound thermal insulation pipe belt transmission line and a production system and a production method. Background Art

[0002] Polyurethane spray-wound insulation pipe is widely used in various fields due to its excellent insulation performance. The production process of polyurethane spray-wound insulation pipe is as follows: the steel pipe to be sprayed is transported to the spraying room. As the steel pipe spirals forward, the steel pipe surface is evenly sprayed with polyurethane powder in the spraying room. After spraying, it is transported out of the spraying room. After the sprayed polyurethane powder on the steel pipe surface is solidified, a polyurethane foam insulation layer is formed on the steel pipe surface, and finally the product is unloaded.

[0003] At present, for the transportation of polyurethane spray-wrapped insulation pipes, especially the transportation after spraying polyurethane powder, two methods are mostly used: one is the tire transportation method, and the other is the trolley suspended transportation method.

[0004] The Chinese patent with the patent name of polyurethane continuous spraying and polyethylene continuous winding insulation pipe production line and publication number CN208392700U discloses a method for conveying polyurethane spray winding insulation pipes by tires, and its technical solution is as follows: the roller conveyor line before spraying includes a spraying frame, a V-shaped bracket is fixedly arranged on the spraying frame, a first rubber wheel is fixedly arranged on one side of the V-shaped bracket, and a second rubber wheel is fixedly arranged on the other side of the V-shaped bracket through a first pressure bar and a first support plate, the first rubber wheel and the second rubber wheel are both connected with a first reducer, the first reducer is connected to a first motor, a first hydraulic telescopic rod is arranged on the central axis of the V-shaped bracket, a first hydraulic upper tube puller is hinged at the free end of the first hydraulic telescopic rod, one end of the first hydraulic upper tube puller is fixedly connected to the first rubber wheel, and the other end of the first hydraulic upper tube puller is hingedly connected to the upper tube platform, and the first hydraulic upper tube puller is V-shaped.

[0005] During operation, the transportation is completed by the squeezing of the first rubber wheel and the second rubber wheel. However, the surface of the pipe that has just been sprayed with polyurethane has not yet been completely solidified. Under the rolling of the rubber wheel (tire), it is easy to affect the flatness of the surface of the polyurethane foam insulation layer, affect the product quality, and even cause the polyurethane foam insulation layer to crack. Once cracked, it cannot be repaired, and the old polyurethane foam insulation layer needs to be removed and re-sprayed, which not only increases production costs but also affects production efficiency.

[0006] The Chinese patent with the patent name of Support Rotating Device for Polyurethane Spray Insulation Pipe Production Line and the publication number of CN213133721U discloses a suspended method of conveying polyurethane spray winding insulation pipes. Its technical solution is as follows: it includes a horizontal moving trolley, a rotating mechanism, a supporting chuck and a hydraulic system. The rotating mechanism slides above the horizontal moving trolley, the supporting chuck rotates on one side of the top of the rotating mechanism, and the hydraulic system is fixedly installed above the horizontal moving trolley. During operation, the steel pipe to be sprayed is clamped on the supporting chuck, and then the steel pipe is conveyed in the spraying production line by the movement of the horizontal moving trolley on the track.

[0007] Although the method of suspended conveying polyurethane spray-wrapped insulation pipe solves the problem of rolling cracking of the polyurethane foam insulation layer before curing by suspending the steel pipe, the clamping and disassembly of the steel pipe on the trolley is relatively cumbersome, and continuous spraying production of the steel pipe cannot be achieved, affecting production efficiency. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a large-diameter polyurethane spray-wrapped insulated pipe belt transmission line and a production system and a production method that improve production efficiency, ensure product quality, save production costs, facilitate operation, save manpower and effort, and are easy to implement.

[0009] The present invention solves the technical problem by adopting the following technical solutions:

[0010] The large-diameter polyurethane spray-wrapped insulated pipe belt transmission line is characterized in that it includes a base and supporting transmission units that are evenly distributed at inclined intervals along the length direction of the base. The supporting transmission unit includes a base, a bracket, an active roller, a driven roller, a bearing seat and a conveyor belt. A base is installed on the base, and brackets are installed at both ends of the length direction of the base. Active rollers and driven rollers are respectively installed on the brackets at both ends through bearing seats. The active roller is driven to rotate by a reduction motor, and a conveyor belt is wound around the active roller and the driven roller.

[0011] Moreover, the bracket is a fixed bracket, which includes a base plate, a stand and a mounting plate. A relatively arranged stand is installed on the upper end of the base plate, a mounting plate is arranged on the upper end of the stand, and a bearing seat is installed on the mounting plate.

[0012] Moreover, the bracket is a lifting bracket, which includes a base plate, a seat, a mounting plate, a hydraulic cylinder, a guide column and a guide groove. A seat arranged opposite to each other is installed at the upper end of the base plate, a groove is provided in the middle of the seat, a hydraulic cylinder is installed in the groove, vertical guide grooves are provided on the seats at both ends of the groove, guide columns inserted in the guide grooves are provided at both ends of the bottom of the mounting plate, and the hydraulic cylinder rod in the groove is connected to the bottom of the mounting plate.

[0013] Moreover, the guide groove includes a telescopic part of equal diameter and a reduced diameter part of equal diameter arranged on the upper part of the telescopic part. The boss between the reduced diameter part and the telescopic part forms a limiting boss. The guide column is a guide column with a limiting plate at the bottom. The guide plate slides up and down in the telescopic part of the guide groove.

[0014] Moreover, the active roller and the driven roller are arranged on the bracket at an inclined angle of 3°.

[0015] Moreover, it also includes a conveyor belt limiter, in which a conveyor belt limiter installed on a base is provided on one side of the conveyor belt, and the conveyor belt limiter includes a mounting rod and a limiting roller, and the mounting rod is installed on the base, and the limiting roller is rotatably installed on the top of the mounting rod, and the outer wall of the limiting roller is arranged tangent to the edge of the conveyor belt.

[0016] Furthermore, it also includes a tensioner, which includes a mounting block and a pull rod. A mounting block is installed on the outer side of each of the brackets at a position relative to the bearing seat, and a mounting hole is provided on the mounting block. The pull rod includes a threaded rod portion and a connecting plate portion arranged at the end of the threaded rod portion, and a connecting hole is provided on the connecting plate portion. The connecting hole is mounted on the screw that fixes the bearing seat. The threaded rod portion passes through the mounting hole on the mounting block and is tightened and fixed by a nut on the outer side of the mounting plate.

[0017] A large-diameter polyurethane spray-wrapped insulation pipe production system includes a tire-type transmission line and a spray chamber, and is characterized in that it also includes a belt-type transmission line, a tire-type transmission line is arranged on the inlet side of the spray chamber, a belt-type transmission line is arranged on the outlet side of the spray chamber, and a tire-type transmission line is arranged at the rear of the belt-type transmission line.

[0018] Moreover, each bracket supporting the transmission unit on the belt transmission line is a fixed bracket or a lifting bracket, or the bracket supporting the transmission unit at the head end of the belt transmission line is a lifting bracket.

[0019] Moreover, it also includes a connecting pipe, which is arranged on the inner wall between two insulation pipes. The connecting pipe includes a connecting belt and a ratchet tensioner. The two ends of the connecting belt are connected to the two ends of the ratchet tensioner. The ratchet tensioner is used to tighten the connecting belt between the two insulation pipes, thereby realizing the connection between the two insulation pipes.

[0020] The method for producing a large-diameter polyurethane spray-wound thermal insulation pipe is characterized by comprising the following steps:

[0021] Step 1, connecting the steel pipe to be sprayed with polyurethane powder through a connecting pipe;

[0022] Step 2, placing the connected steel pipe on the import side tire type transmission line, and the import side tire type transmission line transmits the steel pipe into the spraying room;

[0023] Step 3, the steel pipe spirals forward in the spraying room, and the polyurethane powder is evenly sprayed by a spray gun to form a polyurethane insulation layer on the surface of the steel pipe;

[0024] Step 4, the steel pipe sprayed with polyurethane powder is discharged from the outlet side of the spraying room and supported on the belt transmission line at the outlet side for transmission;

[0025] Step 5, the steel pipe to be sprayed with polyurethane powder is transmitted to the tail end of the belt transmission line, at which time the polyurethane insulation layer is solidified to form a polyurethane spray-wrapped insulation pipe, which is then transmitted by the tire transmission line at the outlet side of the rear end;

[0026] Step 6, when the polyurethane spray-wrapped insulation pipe is transmitted to the rear end of the tire-type transmission line on the outlet side, the tire at the rear end of the tire-type transmission line on the outlet side accelerates the rotation speed to achieve the separation and unloading of the two polyurethane spray-wrapped insulation pipes.

[0027] Moreover, before the steel pipe sprayed with polyurethane powder is discharged from the outlet side of the spraying room and supported on the belt transmission line on the outlet side for transmission, the conveyor belt at the head end of the belt transmission line is first lowered, and after the steel pipe is transported to the conveyor belt at the head end, the conveyor belt at the head end rises to be flush with other conveyor belts, thereby completing the transportation of the steel pipe sprayed with polyurethane powder.

[0028] The advantages and positive effects of the present invention are:

[0029] 1. This large-diameter polyurethane spray-wrapped insulation pipe belt transmission line, production system and production method, by designing the traditional tire-type conveying method and the trolley suspended conveying method into a conveyor belt supported transmission method, effectively avoids the problem of tire rolling on the surface of the insulation pipe and ensures product quality; at the same time, this belt transmission line can realize the continuous production and transmission of the insulation pipe, solves the tedious operation of frequent loading and unloading of the trolley suspended conveying, greatly improves the production efficiency of the insulation pipe, and reduces the labor intensity of manual loading and unloading.

[0030] 2. This large-diameter polyurethane spray-wrapped insulated pipe belt transmission line, production system and production method can limit the operation of the conveyor belt by setting a conveyor belt limiter to prevent it from deviating during operation and affecting the steel pipes transported thereon.

[0031] 3. The large-diameter polyurethane spray-wound thermal insulation pipe belt transmission line, production system and production method can avoid the problem of relative movement of the active rollers and driven rollers on both sides of the large-diameter polyurethane spray-wound thermal insulation pipe due to its heavy weight by setting a tensioner.

[0032] 4. The present invention is scientifically and reasonably designed, and has the advantages of improving production efficiency, ensuring product quality, saving production costs, facilitating operation, saving manpower and effort, and being easy to implement. It is a highly innovative large-diameter polyurethane spray-wrapped insulation pipe belt transmission line and production system and production method. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of a large-diameter polyurethane spray-wound thermal insulation pipe belt transmission line of the present invention;

[0034] Figure 2 It is a top view of the large-diameter polyurethane spray-wound thermal insulation pipe belt transmission line of the present invention;

[0035] Figure 3 It is a schematic structural diagram of a large-diameter polyurethane spray-wrapped thermal insulation pipe belt transmission line supporting a transmission unit of the present invention;

[0036] Figure 4 for Figure 3 Side view (polyurethane spray-wound insulation pipe omitted);

[0037] Figure 5 Figure 3 Top view (polyurethane spray-wound insulation pipe omitted);

[0038] Figure 6 It is a structural schematic diagram of the assembly of the tensioner and the bearing seat of the present invention;

[0039] Figure 7 It is a structural schematic diagram of the lifting bracket of the present invention;

[0040] Figure 8 It is a structural schematic diagram of the guide column on the lifting bracket of the present invention being installed under the mounting plate;

[0041] Fig. 9 It is a structural schematic diagram of the large-diameter polyurethane spray-wrapped thermal insulation pipe production system of the present invention.

[0042] Description of Reference Numerals

[0043] 1-supporting transmission unit, 2-base, 3-reduction motor, 4-active roller, 5-bracket, 6-conveyor belt, 7-polyurethane spray winding insulation pipe, 8-base, 9-conveyor belt limiter, 10-bearing seat, 11-connecting plate, 12-threaded rod, 13-mounting block, 14-nut, 15-driven roller, 16-import side tire transmission line, 17-spraying room, 18-belt transmission line, 19-export side tire transmission line, 20-mounting plate, 21-hydraulic cylinder, 22-guide column, 23-guide groove, 24-seat, 25-bottom plate. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings: Example

[0045] like Figure 1 , Figure 2 As shown, the large-diameter polyurethane spray-wrapped insulation pipe belt transmission line has the following innovations: it includes a base 2 and a supporting transmission unit 1, such as Figure 2 As shown, each of the supporting and transmitting units is evenly spaced along the length direction of the base, and the supporting and transmitting units are tilted in the horizontal direction to ensure that the polyurethane spray-wrapped insulation pipe 7 is transmitted forward;

[0046] like Figure 3 , Figure 4 , Figure 5 As shown, the supporting transmission unit includes a base 8, a bracket 5, an active roller 4, a driven roller 15, a bearing seat 10 and a conveyor belt 6. A base is installed on the base, and brackets are installed at both ends of the base in the length direction. Active rollers and driven rollers are installed on the brackets at both ends through bearing seats respectively. The active roller is driven to rotate by a reduction motor 3, and a conveyor belt is wound around the active roller and the driven roller.

[0047] The bracket is a fixed bracket, which includes a base plate, a stand and a mounting plate. A relatively arranged stand is mounted on the upper end of the base plate, a mounting plate is mounted on the upper end of the stand, and a bearing seat is mounted on the mounting plate.

[0048] During operation, the reduction motor drives the active roller to rotate, thereby driving the conveyor belt to rotate on the active roller and the driven roller.

[0049] like Figure 4 As shown, the active roller and the driven roller are tilted on the bracket, and the tilt angle is 3°.

[0050] In order to prevent the conveyor belt from swaying during operation, the present invention further designs a conveyor belt limiter 9, and a conveyor belt limiter installed on a base is provided on one side or both sides of the conveyor belt. The conveyor belt limiter includes a mounting rod and a limiting roller. The mounting rod is installed on the base, and the limiting roller is rotatably installed on the top of the mounting rod. The outer wall of the limiting roller is arranged tangent to the edge of the conveyor belt.

[0051] The large diameter polyurethane spray winding insulation pipe generally has a diameter of more than 1m and a weight of about 8t. Due to its large weight, there is a problem of squeezing the conveyor belt during transportation, and squeezing the active rollers and driven rollers at both ends to both ends. In order to overcome this problem, the present invention designs a tensioner, such as Figure 6 As shown, the tensioner includes a mounting block 13 and a pull rod. A mounting block is installed on the outer side of each bracket relative to the bearing seat. A mounting hole is provided on the mounting block. The pull rod includes a threaded rod portion 12 and a connecting plate portion 11 arranged at the end of the threaded rod portion. A connecting hole is provided on the connecting plate portion, and the connecting hole is mounted on the screw that fixes the bearing seat. After the threaded rod portion passes through the mounting hole on the mounting block, it is tightened and fixed by a nut 14 on the outer side of the mounting plate.

[0052] The pull rod squeezes the bearing seat to prevent it from moving outward, ensuring the normal transmission of the large-diameter polyurethane spray-wound insulation pipe.

[0053] like Fig. 9 As shown, a large-diameter polyurethane spray-wrapped insulation pipe production system includes a tire-type transmission line and a spray chamber 17, and its innovation lies in: the tire-type transmission line includes an inlet-side tire-type transmission line 16 and an outlet-side tire-type transmission line 19, and also includes a belt-type transmission line 18. An inlet-side tire-type transmission line is arranged on the inlet side of the spray chamber, a belt-type transmission line is arranged on the outlet side of the spray chamber, and an outlet-side tire-type transmission line is arranged at the rear of the belt transmission line.

[0054] Before the polyurethane powder is sprayed on the steel pipe, the steel pipe is transported by the tire-type transmission line on the inlet side, and the tire-type transmission line on the inlet side transports the steel pipe into the spraying room;

[0055] The steel pipe spirals forward in the spraying room and is sprayed with polyurethane powder to form a polyurethane insulation layer on the surface of the steel pipe;

[0056] The sprayed steel pipe is partially discharged and supported on the belt conveyor line at the outlet for transmission;

[0057] When it is transmitted to the tail end of the belt transmission line, the polyurethane insulation layer is solidified and then the material is sent out by the tire transmission line at the outlet side of the rear end.

[0058] Since the curing of the polyurethane insulation layer takes a certain amount of time, the length of the belt transmission line should be arranged according to the specific drying time. The conveyor belt on the belt transmission line supports and transports the incompletely cured polyurethane spray-wound insulation pipe, avoiding the problem of surface cracking caused by tire rolling in the prior art, which affects the insulation quality. It is particularly suitable for the production of large-diameter polyurethane spray-wound insulation pipes.

[0059] During specific production transmission, a take-over device can be added between two steel pipes to achieve continuous and uninterrupted spraying of steel pipes on the polyurethane spraying production line. When going offline, the transmission speed of the tire-type transmission line on the outlet side can be increased to achieve automatic separation of the two connected pipes. The setting of the take-over device can also prevent the steel pipe from swinging on the transmission line.

[0060] The connecting pipe comprises a connecting belt and a ratchet tensioner, the two ends of the connecting belt are connected to the two ends of the ratchet tensioner, and the ratchet tensioner is used to tighten the connecting belt between the two insulation pipes, thereby achieving the connection between the two insulation pipes. Example

[0061] In order to adapt to the height of the insulation pipe after the insulation layer is sprayed on different production lines, the bracket is a lifting bracket, such as Figure 7 , Figure 8 As shown, the lifting bracket includes a base plate 25, a stand 24, a mounting plate 20, a hydraulic cylinder 21, a guide column 22 and a guide groove 23. A stand is installed at the upper end of the base plate, a groove is provided in the middle of the stand, a hydraulic cylinder is installed in the groove, vertical guide grooves are provided on the stands at both ends of the groove, guide columns inserted in the guide grooves are provided at both ends of the bottom of the mounting plate, and the hydraulic cylinder rod in the groove is connected to the bottom of the mounting plate. The guide groove includes a telescopic part of equal diameter and a reduced diameter part of equal diameter provided on the upper part of the telescopic part, and the boss between the reduced diameter part and the telescopic part forms a limiting boss. The guide column is a guide column with a limiting plate at the bottom, and the guide plate slides up and down in the telescopic part of the guide groove.

[0062] According to the height of the tire-type conveyor line at the front end of the spray room or the set thickness of the insulation layer, the height of the conveyor belt can be adjusted by lifting and lowering the mounting plate through the hydraulic cylinder to meet production needs. Example

[0063] The support transmission unit located at the front end of the base has a bracket thereon which is a lifting bracket, and the bracket located at the rear end of the lifting bracket is a fixed bracket.

[0064] The height of the conveyor belt on the supporting and transmitting unit at the head end is adjustable, which is beneficial to the smooth transition of the insulation pipe after spraying the polyurethane powder to the belt transmission line. That is, when the steel pipe is discharged from the spraying room after spraying the polyurethane powder, the upper end surface of the conveyor belt on the supporting and transmitting unit at the head end is located below the lower end surface of the insulation pipe. When the insulation pipe passes through the upper end of the supporting and transmitting unit at the head end, the rod of the hydraulic cylinder extends to raise the conveyor belt at the head end to the same height as the conveyor belt on the rear end fixed bracket, thereby avoiding the problem of the end of the conveyor belt at the head end causing damage to the uncured insulation layer.

[0065] The production method of large-diameter polyurethane spray-wound thermal insulation pipe is innovative in that it includes the following steps:

[0066] Step 1, connecting the steel pipe to be sprayed with polyurethane powder through a connecting pipe;

[0067] Specifically, the steel pipes to be connected are first butt-jointed in pairs, and then the staff enters the steel pipes with a connecting adapter and installs the connecting adapter at the joints between the two steel pipes. The staff manually operates the ratchet tensioner on the connecting adapter to tighten the connecting belt on the inner walls of the two steel pipes, thereby achieving the connection of the two steel pipes.

[0068] Step 2, placing the connected steel pipe on the import side tire type transmission line, and the import side tire type transmission line transmits the steel pipe into the spraying room;

[0069] Step 3, the steel pipe spirals forward in the spraying room, and the polyurethane powder is evenly sprayed by a spray gun to form a polyurethane insulation layer on the surface of the steel pipe;

[0070] Step 4, the steel pipe sprayed with polyurethane powder is discharged from the outlet side of the spraying room and supported on the belt transmission line at the outlet side for transmission;

[0071] Step 5, the steel pipe to be sprayed with polyurethane powder is transmitted to the tail end of the belt transmission line, at which time the polyurethane insulation layer is solidified to form a polyurethane spray-wrapped insulation pipe, which is then transmitted by the tire transmission line at the outlet side of the rear end;

[0072] Before the steel pipe sprayed with polyurethane powder is discharged from the outlet side of the spraying room and supported on the belt transmission line on the outlet side for transmission, the conveyor belt at the head end of the belt transmission line descends first. After the steel pipe is transported to the conveyor belt at the head end, the conveyor belt at the head end rises to be flush with other conveyor belts, thereby completing the transportation of the steel pipe sprayed with polyurethane powder.

[0073] Step 6, when the polyurethane spray-wrapped insulation pipe is transmitted to the rear end of the tire-type transmission line on the outlet side, the tire at the rear end of the tire-type transmission line on the outlet side accelerates the rotation speed to achieve the separation and unloading of the two polyurethane spray-wrapped insulation pipes.

[0074] The continuous and uninterrupted spraying production of steel pipes not only improves production efficiency, but also avoids the waste of polyurethane powder spraying and saves production costs.

[0075] By using this large-diameter polyurethane spray-wrapped insulation pipe production system, product quality is greatly improved, scrap rate is reduced, production costs are saved, production efficiency can be increased by at least 10%, and the competitiveness of enterprises in the industry is greatly improved.

[0076] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. Large diameter polyurethane spray-wound insulation pipe belt transmission line, characterized by: The invention comprises a base (2) and a supporting transmission unit (1) which is evenly spaced and inclined along the length direction of the base (2). The supporting transmission unit (1) comprises a base (8), a bracket (5), an active roller (4), a driven roller (15), a bearing seat (10) and a conveyor belt (6). The base (8) is installed on the base (2). The brackets (5) are installed at both ends of the base (8) in the length direction. The active roller (4) and the driven roller (15) are installed on the brackets (5) at both ends through the bearing seats (10). The active roller (4) is driven to rotate by a reduction motor (3). The conveyor belt (6) is wound around the active roller (4) and the driven roller (15). The conveyor belt is used for supporting and conveying the polyurethane spray-wound insulation pipe that is not fully cured.

2. The large-diameter polyurethane spray-wound thermal insulation pipe belt transmission line according to claim 1 is characterized in that: The bracket (5) is a fixed bracket (5), and the fixed bracket (5) comprises a base plate (25), a stand (24) and a mounting plate (20), wherein a stand (24) arranged opposite to the base plate (25) is mounted on the upper end of the base plate (25), a mounting plate (20) is arranged on the upper end of the stand (24), and a bearing seat (10) is mounted on the mounting plate (20).

3. The large-diameter polyurethane spray-wound thermal insulation pipe belt transmission line according to claim 1 is characterized in that: The bracket (5) is a lifting bracket (5), and the lifting bracket (5) comprises a base plate (25), a stand (24), a mounting plate (20), a hydraulic cylinder (21), a guide column (22) and a guide groove (23). A stand (24) arranged opposite to each other is mounted on the upper end of the base plate (25), a groove is provided in the middle of the stand (24), a hydraulic cylinder (21) is installed in the groove, and vertical guide grooves (23) are provided on the stand (24) at both ends of the groove. Guide columns (22) inserted into guide grooves (23) are provided at both ends of the bottom of the plate (20); the cylinder rod of the hydraulic cylinder (21) in the groove is connected to the bottom of the mounting plate (20); the guide groove (23) comprises a telescopic portion of equal diameter and a reduced diameter portion of equal diameter arranged on the upper part of the telescopic portion; a boss between the reduced diameter portion and the telescopic portion forms a limiting boss; the guide column (22) is a guide column (22) with a limiting disk at the bottom; the guide disk slides up and down in the telescopic portion of the guide groove (23).

4. The large-diameter polyurethane spray-wound thermal insulation pipe belt transmission line according to claim 1 is characterized in that: The active roller (4) and the driven roller (15) are arranged on the bracket (5) at an angle of 3°.

5. The large-diameter polyurethane spray-wound thermal insulation pipe belt transmission line according to claim 1 is characterized in that: It also includes a tensioner, the tensioner includes a mounting block (13) and a pull rod, the mounting block (13) is installed on the outer side of each bracket (5) at a position relative to the bearing seat (10), and a mounting hole is provided on the mounting block (13), the pull rod includes a threaded rod portion (12) and a connecting plate portion (11) arranged at the end of the threaded rod portion (12), and a connecting hole is provided on the connecting plate portion (11), and the connecting hole is sleeved on the screw fixing the bearing seat (10), and the threaded rod portion (12) passes through the mounting hole on the mounting block (13) and is tightened and fixed by a nut (14) on the outer side of the mounting plate (20).

6. A large diameter polyurethane spray-wound insulation pipe production system, comprising a tire-type transmission line and a spray chamber (17), characterized in that: It also includes a belt transmission line (18) as described in any one of claims 1 to 5, a tire transmission line is arranged on the inlet side of the spray chamber (17), a belt transmission line (18) is arranged on the outlet side of the spray chamber (17), and a tire transmission line is arranged at the rear of the belt transmission line (18).

7. The large diameter polyurethane spray-wrapped thermal insulation pipe production system according to claim 6 is characterized by: The brackets (5) supporting the transmission units (1) on the belt transmission line (18) are all fixed brackets (5) or are all lifting brackets (5) or the bracket (5) supporting the transmission unit (1) at the head end of the belt transmission line (18) is a lifting bracket (5).

8. The large diameter polyurethane spray-wrapped thermal insulation pipe production system according to claim 6 is characterized by: It also includes a connecting pipe, which is arranged on the inner wall between two insulation pipes. The connecting pipe includes a connecting belt and a ratchet tensioner. The two ends of the connecting belt are connected to the two ends of the ratchet tensioner. The ratchet tensioner is used to tighten the connecting belt between the two insulation pipes, thereby realizing the connection between the two insulation pipes.

9. A method for producing a large diameter polyurethane spray-wound thermal insulation pipe, characterized in that: The production method is implemented based on the large-diameter polyurethane spray-wrapped thermal insulation pipe production system according to any one of claims 6 to 8, and comprises the following steps: Step 1, connecting the steel pipe to be sprayed with polyurethane powder through a connecting pipe; Step 2, placing the connected steel pipe on the inlet side tire type transmission line (16), and the inlet side tire type transmission line (16) transmits the steel pipe into the spraying room (17); Step 3, the steel pipe spirally moves forward in the spraying room (17), and the polyurethane powder is evenly sprayed by a spray gun to form a polyurethane insulation layer on the surface of the steel pipe; Step 4, the steel pipe sprayed with polyurethane powder is discharged from the outlet side of the spraying room (17) and supported on the belt transmission line (18) at the outlet side for transmission; Step 5, the steel pipe to be sprayed with polyurethane powder is transmitted to the rear end of the belt transmission line (18), at which time the polyurethane insulation layer is solidified to form a polyurethane spray-wrapped insulation pipe (7), and the polyurethane spray-wrapped insulation pipe (7) is then transmitted by the tire transmission line (19) at the outlet side of the rear end; Step 6, when the polyurethane spray-coated, wound, and insulated pipes (7) are conveyed to the rear end of the tire-type transmission line (19) on the outlet side, the tire on the rear end of the tire-type transmission line (19) on the outlet side speeds up, thereby achieving separation and unloading of the two polyurethane spray-coated, wound, and insulated pipes (7).

10. The method for producing a large diameter polyurethane spray-wound thermal insulation pipe according to claim 9, characterized in that: Before the steel pipe sprayed with polyurethane powder is discharged from the outlet side of the spraying room (17) and supported on the belt transmission line (18) at the outlet side for transmission, the conveyor belt (6) at the head end of the belt transmission line (18) is first lowered, and after the steel pipe is transported to the conveyor belt (6) at the head end, the conveyor belt (6) at the head end rises to be flush with the other conveyor belts (6), thereby completing the transportation of the steel pipe sprayed with polyurethane powder.

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