Production process of cutting-free spraying polyurethane thermal insulation pipe

Abstract

The invention belongs to the technical field of thermal insulation pipe production, and relates to a cutting-free spraying polyurethane thermal insulation pipe production technology which comprises the steps that S1, replacement structures are installed at the two ends of a steel pipe correspondingly; s2, the steel pipe is fixed to a rotating mechanism through a chuck; s3, the rotating steel pipe is sprayed with a polyurethane foam material through spraying equipment; s4, after spraying is completed, outer protection pipe winding is conducted; and S5, the outer protection pipes at the two ends are cut off, the replacement structure is exposed, then the replacement structure is detached, and the part, where the replacement structure is installed, of the steel pipe is the welding part. According to the production process of the cutting-free spraying polyurethane thermal insulation pipe, spraying of the thermal insulation layer is replaced by the replacement structure, and meanwhile, the spraying starting time is adjusted, so that spraying of redundant polyurethane foam materials can be effectively avoided, raw materials are saved, and cutting operation and clearing work of the redundant foam materials are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal insulation pipe production, and relates to a production process for cutting-free spray polyurethane thermal insulation pipes. Background Art

[0002] In the polyurethane insulation pipe spray winding process, for welding needs, the foam on the two ends of the steel pipe after the spraying is completed usually needs to be cleaned up by 20 centimeters to leave the steel pipe installation welding surface. In this way, a steel pipe will have 40 centimeters of polyurethane foam garbage cleaned up, which will not only cause material waste, but also require environmental protection personnel to carry out special cleaning and disposal. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a production process for cutting-free spray polyurethane thermal insulation pipe.

[0004] To achieve the above object, the present invention provides a production process for a cutting-free spray polyurethane thermal insulation pipe, comprising:

[0005] S1. Install alternative structures at both ends of the steel pipe;

[0006] S2. Fix the steel pipe on the rotating mechanism using a chuck;

[0007] S3, spraying polyurethane foam material on the rotating steel pipe using a spraying device;

[0008] S4. After spraying, wrap the outer protective tube;

[0009] S5. Cut off the outer protective tubes at both ends to expose the alternative structure, and then remove the alternative structure. The portion on the steel pipe where the alternative structure is installed is the welding portion.

[0010] Furthermore, the replacement structure is in the shape of a circular ring plate, and the height difference between the outer surface of the replacement structure and the outer surface of the steel pipe is the thickness of the sprayed polyurethane foam material.

[0011] Furthermore, after the spraying equipment is turned on, it moves from one end of the steel pipe to the other end, and when the spraying equipment starts to move to the alternative structure that passes over one end of the steel pipe, it starts to spray the polyurethane foam material, and continues to move to the alternative structure on the other end of the steel pipe and stops spraying.

[0012] Furthermore, the axial thickness of the alternative structure is 20 cm.

[0013] The beneficial effects of the present invention are as follows:

[0014] The cutting-free spray polyurethane insulation pipe production process of the present invention can effectively avoid the spraying of excess polyurethane foam material by setting an alternative structure to replace the spraying of the insulation layer and adjusting the start time of the spraying, thereby avoiding the operation of cutting and clearing away the excess foam material required in the original process. DETAILED DESCRIPTION

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0017] The present invention provides a production process for cutting-free spray polyurethane insulation pipe, comprising: S1, installing alternative structures at both ends of a steel pipe respectively; S2, fixing the steel pipe on a rotating mechanism by using a chuck; S3, spraying polyurethane foam material on the rotating steel pipe by using a spraying device; S4, after the spraying is completed, winding an outer protective pipe; S5, cutting off the outer protective pipes at both ends to expose the alternative structure, and then removing the alternative structure, and the part of the steel pipe where the alternative structure is installed is the welding part.

[0018] The cutting-free spray polyurethane thermal insulation pipe production process of the present invention can avoid the generation of a large amount of waste foam, which is conducive to solving the problem of raw materials and avoiding tedious subsequent cleaning and transportation work.

[0019] According to one embodiment of the present invention, the replacement structure in the present invention is set to a circular ring plate shape, and the replacement structure is installed at both ends of the steel pipe to replace the sprayed polyurethane foam material, that is, this part is not sprayed, and the replacement structure is used instead, which will not affect the subsequent winding operation of the outer protective pipe. In the present invention, the height difference between the outer surface of the replacement structure and the outer surface of the steel pipe is the thickness of the sprayed polyurethane foam material. In practical applications, the spray thickness of the polyurethane foam material can be determined according to the required thickness of the thermal insulation layer, and the size of the replacement structure can be made accordingly.

[0020] In the production process of the cutting-free spray polyurethane insulation pipe of the present invention, in steps S2 and S3, the steel pipe is fixed on the rotating structure by a chuck, and the polyurethane foam material is sprayed on the rotating steel pipe by a spraying device. The chuck, rotating structure and spraying device used in this step are all existing equipment, and the working process is that the steel pipe is rotated by the rotating structure, and then the spraying device moves from one end of the steel pipe to the other end, and the spraying operation is performed at the same time. The present invention does not improve the above equipment, but only improves the specific operation process, so the above equipment is not described in detail.

[0021] In the present invention, after the spraying equipment is turned on, it moves from one end of the steel pipe to the other end, and when the spraying equipment is turned on and moves to the alternative structure that passes over one end of the steel pipe, it starts spraying the polyurethane foam material, and continues to move to the alternative structure on the other end of the steel pipe and stops spraying. In this embodiment, the axial thickness of the alternative structure is 20 cm. That is to say, two alternative structures with a thickness of 20 cm are installed at both ends of the steel pipe, and then the position where the spraying equipment starts spraying is moved back 20 cm, and spraying starts when it passes over the alternative structure, and spraying ends when it reaches the alternative structure at the other end. Of course, according to the concept of the present invention, the axial thickness of the alternative structure can be set according to specific requirements.

[0022] After spraying is completed, the outer protective pipe is wound. After winding is completed, 20 cm (taking the thick bottom of the alternative structure as an example) of the outer protective pipe at both ends are removed to expose the alternative structure. Then the alternative structure is removed from the steel pipe for reuse. The part of the steel pipe where the alternative structure was originally installed is exposed and used as the welding part.

[0023] The production process for cutting-free spray polyurethane insulated pipes of the present invention can effectively avoid the spraying of excess polyurethane foam material by setting up an alternative structure to replace the spraying of the insulation layer and adjusting the spraying start time, thereby saving raw materials. By installing and dismantling the alternative structure for reuse, the operation of cutting and clearing excess foam material required in the original process is avoided, thereby improving production efficiency.

[0024] In addition, setting the height difference between the outer surface of the replacement structure and the outside of the steel pipe to be consistent with the thickness of the sprayed foam material is more conducive to the winding of the outer protective tube, which is mainly manifested in the following points. On the one hand, it can ensure that the sprayed edge is very neat, avoiding the poor winding of the outer protective tube caused by irregular edges. It can also effectively prevent the foam material from overflowing to the edge of the replacement structure during the spraying process, ensuring that the welding part is completely unaffected by the sprayed material. At the same time, the neat sprayed edge can reduce the difficulty of winding, avoid uneven winding or gaps caused by irregular edges, and make the outer protective tube fit more closely on the spray layer when winding, improving the fit and airtightness of the outer protective tube.

[0025] The above is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A production process for cutting-free spray polyurethane insulation pipe, comprising: S1. Install alternative structures at both ends of the steel pipe; S2. Fix the steel pipe on the rotating mechanism using a chuck; S3, spraying polyurethane foam material on the rotating steel pipe using a spraying device; S4. After spraying, wrap the outer protective tube; S5. Cut off the outer protective tubes at both ends to expose the alternative structure, and then remove the alternative structure. The portion on the steel pipe where the alternative structure is installed is the welding portion.

2. The production process of the cutting-free spray polyurethane thermal insulation pipe according to claim 1 is characterized in that: The replacement structure is in the shape of a circular ring plate, and the height difference between the outer surface of the replacement structure and the outer surface of the steel pipe is the thickness of the sprayed polyurethane foam material.

3. The production process of the cutting-free spray polyurethane thermal insulation pipe according to claim 2 is characterized in that: After the spraying equipment is turned on, it moves from one end of the steel pipe to the other end, and when the spraying equipment moves past the alternative structure at one end of the steel pipe, it starts spraying the polyurethane foam material, and continues to move to the alternative structure on the other end of the steel pipe and stops spraying.

4. The production process of the cutting-free spray polyurethane thermal insulation pipe according to claim 3 is characterized in that: The axial thickness of the alternative structure is 20 cm.