Spraying equipment and spraying process for polyurethane spray insulation pipe

Abstract

The present invention discloses a spraying device for polyurethane spray-coated insulated pipes. The device comprises a polyurethane spraying trolley, a polyurethane sprayer for spraying large areas of the insulated pipe, a portable polyurethane sprayer for re-spraying the ends of the insulated pipe, and a grinding machine for milling and smoothing the ends. The spraying device and spraying process for polyurethane spray-coated insulated pipes provided herein effectively solve the problem of prematurely activating and delaying the polyurethane spray gun in conventional polyurethane spray-coated insulated pipe spraying processes, resulting in waste products at both ends of the pipe, thereby reducing spraying costs.

Description

Technical Field

[0001] The invention belongs to the technical field of external protection processing of thermal insulation pipes, and particularly relates to spraying equipment and a spraying process for polyurethane spray thermal insulation pipes. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] Since the invention of polyurethane in the 1930s, direct-buried polyurethane insulated pipe has been rapidly developed as an excellent thermal insulation material, with its application range becoming increasingly wide. Due to its simple construction and significant energy-saving and anti-corrosion effects, it is widely used in various heating and cooling projects.

[0004] At present, polyurethane spray insulation pipes are mainly produced in an intermittent (trolley) manner. The main process flow is as follows: the polyurethane spray gun does not move, and the insulation pipe is fixed with a clamp so that the insulation pipe moves at a constant speed at a certain angle on the rotating trolley. A spiral layer will be formed during the polyurethane spraying process, which can not only increase the thickness of the polyurethane but also ensure the smoothness of the appearance. Since the polyurethane spray gun uses a fan-shaped spraying method, each time the insulation pipe starts to be sprayed, in order to ensure that the thickness and flatness of the polyurethane at the head end of the insulation pipe meet the requirements, the polyurethane spray gun needs to be turned on in advance. At the same time, each time the spraying is completed, in order to ensure that the thickness and flatness of the polyurethane at the tail end of the insulation pipe meet the requirements, the polyurethane spray gun needs to be turned off with a delay. Turning on the polyurethane spray gun in advance and delaying the shutdown of the polyurethane spray gun increase polyurethane spray waste and increase the production cost of the enterprise. Summary of the Invention

[0005] In order to overcome the above problems, the present invention provides a spraying equipment and spraying process for polyurethane spray insulation pipes, which effectively solves the problem of spraying waste at both ends of the insulation pipe caused by premature opening of the polyurethane spray gun and delayed closing of the polyurethane spray gun in the traditional polyurethane spray insulation pipe spraying process, thereby saving the cost of spraying.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] The first aspect of the present invention provides a spraying equipment for polyurethane spray-insulated pipes, which includes: a polyurethane spraying trolley, a polyurethane sprayer for spraying large-area insulation pipes, a portable polyurethane sprayer for re-spraying the head and tail ports of the insulation pipes, and a grinding machine for milling and smoothing the head and tail ports of the insulation pipes.

[0008] In one or more embodiments, the spraying angle of the portable polyurethane sprayer can be rotated, and the front and rear spraying distance can be adjusted.

[0009] In one or more embodiments, the milling cutter of the grinding machine is a roller-type milling cutter, and the roller length of the roller-type milling cutter is ≥200 mm. The longer milling cutter length ensures that the pitch of the steel pipe during rotation does not exceed the milling cutter length, thereby ensuring that no polyurethane is left unmilled during grinding.

[0010] A second aspect of the present invention provides a spraying process for a polyurethane spray insulation pipe, the spraying process comprising:

[0011] Initial spraying: According to the range of the polyurethane fan mist sprayed by the polyurethane sprayer, control the polyurethane sprayer to start spraying when the head end of the insulation pipe just moves to the edge of the polyurethane sprayer spraying fan mist and the fan mist sprayed by the polyurethane sprayer is completely sprayed on the insulation pipe; when the tail end of the insulation pipe just moves to the edge of the polyurethane sprayer spraying fan mist and the fan mist sprayed by the polyurethane sprayer is completely sprayed on the insulation pipe, turn off the polyurethane sprayer;

[0012] Re-spraying: After the initial spraying of the insulation pipe is completed, the head and tail ports of the insulation pipe form a spraying slope. Use a portable sprayer to re-spray the spraying slopes of the head and tail ports of the insulation pipe. Stop spraying after the spraying is flush with or slightly higher than the pipe body.

[0013] Milling and smoothing: Use a grinding machine to grind the sprayed inclined surfaces of the two ends of the insulation pipe until they are flush with the pipe body.

[0014] The beneficial effects of the present invention are:

[0015] The present invention provides a polyurethane spray insulation pipe spraying equipment and spraying process, which effectively solves the problem of spraying waste at both ends of the insulation pipe caused by premature opening of the polyurethane spray gun and delayed closing of the polyurethane spray gun in the traditional polyurethane spray insulation pipe spraying process, thereby saving the cost of spraying.

[0016] The spraying process of the present invention is simple to operate and has low skill requirements for spraying operators.

[0017] Portable sprayers are mainly used for: building exterior wall insulation spraying, interior wall insulation spraying, cold storage insulation spraying, refrigerated truck insulation spraying, car body sound insulation spraying, cabin insulation spraying, roof waterproof insulation spraying, tank anti-corrosion insulation spraying, roof waterproof insulation spraying, solar water heaters, refrigerators, freezers, etc. They have never been used for spraying polyurethane for insulation pipes. This application uses it for the first time to spray polyurethane for insulation pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 This is a spraying process diagram of the first port of the polyurethane spray insulation pipe in Comparative Example 1;

[0020] Figure 2 This is a spraying process diagram of the polyurethane spray insulation pipe tail end in Comparative Example 1;

[0021] Figure 3 This is a diagram of the spraying process at the first end of the polyurethane spray insulation pipe in Example 1 of the present invention;

[0022] Figure 4 This is a diagram of the spraying process at the tail end of the polyurethane spray insulation pipe in Example 1 of the present invention;

[0023] Figure 5 This is a diagram of the overall spraying process of the polyurethane spray insulation pipe in Example 1 of the present invention; wherein 1 is the insulation pipe, 2 is the polyurethane sprayer, 3 is the portable polyurethane sprayer, 4 is the polyurethane sprayed by the polyurethane sprayer, and 5 is the polyurethane sprayed by the portable polyurethane sprayer;

[0024] Figure 6 This is the effect picture after the polyurethane spray insulation pipe in Comparative Example 1 is sprayed;

[0025] Figure 7 This is a rendering of the polyurethane spray insulation pipe after spraying in Example 1 of the present invention;

[0026] Figures 1 to 5 The middle arrow indicates the horizontal movement direction of the poly spraying trolley. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0028] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0029] See Figure 3 、 Figure 4 、 Figure 5 , these drawings are spraying process diagrams of the polyurethane spray insulation pipe of the present invention.

[0030] Example 1

[0031] A spraying process for a polyurethane spray insulation pipe, comprising:

[0032] Initial spraying: According to the range of the polyurethane fan mist sprayed by the polyurethane sprayer, control the polyurethane sprayer to start spraying when the head end of the insulation pipe just moves to the edge of the polyurethane sprayer spraying fan mist and the fan mist sprayed by the polyurethane sprayer is completely sprayed on the insulation pipe; when the tail end of the insulation pipe just moves to the edge of the polyurethane sprayer spraying fan mist and the fan mist sprayed by the polyurethane sprayer is completely sprayed on the insulation pipe, turn off the polyurethane sprayer;

[0033] Re-spraying: After the initial spraying of the insulation pipe is completed, the head and tail ports of the insulation pipe form a spraying slope. Use a portable sprayer to re-spray the spraying slopes of the head and tail ports of the insulation pipe. Stop spraying after the spraying is flush with or slightly higher than the pipe body.

[0034] Milling and smoothing: Use a grinding machine to grind the sprayed inclined surfaces of the two ends of the insulation pipe until they are flush with the pipe body.

[0035] Comparative Example 1 (traditional spraying process)

[0036] See Figure 1 、 Figure 2 , these drawings are diagrams of the traditional polyurethane spraying process in this comparative example.

[0037] The traditional process includes: according to the range of the polyurethane fan mist sprayed by the polyurethane sprayer, controlling when the head end of the insulation pipe moves into the spray fan mist of the polyurethane sprayer, and the length of the head end of the insulation pipe entering the spray fan mist of the polyurethane sprayer is ≤100mm, turning on the polyurethane sprayer for spraying. At this time, most of the fan mist sprayed by the polyurethane sprayer will be wasted and sprayed on the fixture; when the tail end of the insulation pipe just moves into the spray fan mist of the polyurethane sprayer, and the tail end of the insulation pipe remains in the spray fan mist of the polyurethane sprayer for a length of ≤100mm, turning off the polyurethane sprayer. At this time, most of the fan mist sprayed by the polyurethane sprayer will be wasted and sprayed on the fixture.

[0038] Taking Φ1420 steel pipe as an example, the thickness of the sprayed polyurethane is 100 mm. Using the traditional process method, the waste of the clamps at both ends is generally 20-25 kg. However, using the process method in Example 1 of the present invention, the milling waste is only 5 kg, saving 75% to 80% of polyurethane.

Claims

1. A spraying process for polyurethane spray insulation pipe, characterized in that: The spraying process includes: Initial spraying: According to the range of the polyurethane fan mist sprayed by the polyurethane sprayer, control the polyurethane sprayer to start spraying when the head end of the insulation pipe just moves to the edge of the polyurethane sprayer spraying fan mist and the fan mist sprayed by the polyurethane sprayer is completely sprayed on the insulation pipe; when the tail end of the insulation pipe just moves to the edge of the polyurethane sprayer spraying fan mist and the fan mist sprayed by the polyurethane sprayer is completely sprayed on the insulation pipe, turn off the polyurethane sprayer; Re-spraying: After the initial spraying of the insulation pipe is completed, the head and tail ports of the insulation pipe form a spraying slope. Use a portable sprayer to re-spray the spraying slopes of the head and tail ports of the insulation pipe. Stop spraying after the spraying is flush with or slightly higher than the pipe body. Milling and leveling: Use a grinding machine to grind the sprayed bevels at the head and tail ends of the insulation pipe after spraying until they are flush with the pipe body; The spraying equipment used in the spraying process includes: a polyurethane spraying trolley, a polyurethane sprayer for spraying large areas of insulation pipes, a portable polyurethane sprayer for spraying the head and tail ends of the insulation pipes, and a grinding machine for milling and smoothing the head and tail ends of the insulation pipes.

2. The spraying process according to claim 1, wherein: The spraying angle of the portable polyurethane sprayer can be rotated, and the front and rear spraying distances can be adjusted.

3. The spraying process according to claim 1, wherein: The milling cutter of the grinding machine is a roller-type milling cutter, and the roller length of the roller-type milling cutter is ≥200 mm.

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