CN115463763A - Method and system for determining spraying parameters of polyurethane thermal insulation pipe - Google Patents
Method and system for determining spraying parameters of polyurethane thermal insulation pipe Download PDFInfo
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- CN115463763A CN115463763A CN202211157561.3A CN202211157561A CN115463763A CN 115463763 A CN115463763 A CN 115463763A CN 202211157561 A CN202211157561 A CN 202211157561A CN 115463763 A CN115463763 A CN 115463763A
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- 238000005507 spraying Methods 0.000 title claims abstract description 138
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 67
- 239000004814 polyurethane Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000009413 insulation Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 129
- 239000010959 steel Substances 0.000 claims abstract description 129
- 239000007921 spray Substances 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- 239000006260 foam Substances 0.000 claims abstract description 5
- 238000004321 preservation Methods 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 13
- KEQXNNJHMWSZHK-UHFFFAOYSA-L 1,3,2,4$l^{2}-dioxathiaplumbetane 2,2-dioxide Chemical compound [Pb+2].[O-]S([O-])(=O)=O KEQXNNJHMWSZHK-UHFFFAOYSA-L 0.000 claims description 4
- 239000006071 cream Substances 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 3
- 238000005187 foaming Methods 0.000 abstract description 7
- 101100356682 Caenorhabditis elegans rho-1 gene Proteins 0.000 description 13
- 238000004364 calculation method Methods 0.000 description 8
- 239000002699 waste material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012821 model calculation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/084—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to condition of liquid or other fluent material already sprayed on the target, e.g. coating thickness, weight or pattern
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
- B05B12/122—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to presence or shape of target
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
- B05B12/124—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to distance between spray apparatus and target
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
- B05B12/126—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to target velocity, e.g. to relative velocity between spray apparatus and target
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
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Abstract
The invention discloses a method and a system for determining spraying parameters of a polyurethane thermal insulation pipe, which belong to the technical field of thermal insulation pipes and comprise the following steps: obtaining foaming performance, the outer diameter and length of the steel pipe, the thickness of the heat-insulating layer and various spraying performances of equipment; determining the range of the rotation speed r according to the milky white time, the gel time, the viscosity losing time in the foaming performance and the spraying time in the spraying performance; determining the number of spraying layers according to the free foam density, the outer diameter of the steel pipe and the thickness of the insulating layer in the foaming performance; determining the density of the insulating layer according to the number of spraying layers, the density of the free bubbles and the increased density of each layer; determining the range of the advancing speed V of the steel pipe according to the spraying flow, the outer diameter of the steel pipe, the thickness of the heat-insulating layer, the density of the heat-insulating layer and the length of the steel pipe in the spraying performance; determining the ratio of V to r according to the angle of a spray gun, the distance between the spray gun and the steel pipe and the number of spraying layers in the spraying performance; and determining V and r according to the range of V, the range of r and the ratio of V to r. The obtained spraying parameters are adapted to the actual production.
Description
Technical Field
The invention relates to the technical field of heat preservation pipes, in particular to a method and a system for determining spraying parameters of a polyurethane heat preservation pipe.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The polyurethane heat-insulating pipe is obtained by spraying a polyurethane heat-insulating layer on the outer wall of the steel pipe, and the thickness and the uniformity of the polyurethane heat-insulating layer are directly related to the heat-insulating effect of the heat-insulating pipe.
The spraying parameters of the existing heat-insulating pipe are generally determined through field tests or obtained through model calculation, and because the heat-insulating pipe has different pipe diameters and different spraying thicknesses, the required spraying parameters are different, when the field tests are required to determine each time, the resource waste generated by the tests is serious, the production cost is increased, and the working efficiency is reduced; the spraying parameters are determined through the model, so that the working efficiency is improved, and the cost is reduced, however, the model adopted in the current spraying parameter determination only considers the size of the steel pipe, the thickness of the heat insulation layer and the spraying performance of equipment, and is not combined with the actual production experience, so that the determined spraying parameters have a large difference with the actual production, and the normal production cannot be effectively supported.
Disclosure of Invention
The invention provides a method and a system for determining the spraying parameters of a polyurethane thermal insulation pipe, aiming at solving the problems, wherein when the spraying parameters are determined, the size of a steel pipe, the thickness of a thermal insulation layer and the spraying performance of equipment are considered, and the foaming performance and the actual production experience of polyurethane raw materials are also considered, so that the finally obtained spraying parameters can be more suitable for actual production.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a method for determining spraying parameters of a polyurethane thermal insulation pipe is provided, which includes:
obtaining the free foam density, the milk white time, the gel time, the viscosity losing time, the outer diameter of the steel pipe, the length of the steel pipe, the angle of a spray gun, the distance between the spray gun and the steel pipe, the spraying time from the spray gun head to the pipe body, the required thickness of the heat preservation layer, the increased density of each layer and the spraying flow rate of the polyurethane raw material;
determining the range of the spraying time and the autorotation speed according to the milky white time, the gel time and the viscosity losing time;
determining the number of spraying layers according to the free bubble density, the outer diameter of the steel pipe and the thickness of the heat-insulating layer;
determining the density of the polyurethane heat-insulating layer according to the number of spraying layers, the density of the free bubbles and the increased density of each layer;
determining the ratio of the advancing speed and the autorotation speed of the steel pipe according to the angle of the spray gun, the distance between the spray gun and the steel pipe and the spraying layer number;
determining the range of the advancing speed of the steel pipe according to the spraying flow, the outer diameter of the steel pipe, the thickness of the heat-insulating layer, the density of the heat-insulating layer and the length of the steel pipe;
and determining the advancing speed and the rotation speed of the steel pipe according to the advancing speed range and the rotation speed range of the steel pipe and the ratio of the advancing speed to the rotation speed of the steel pipe.
In a second aspect, a system for determining spraying parameters of a polyurethane thermal insulation pipe is provided, which includes:
the data acquisition module is used for acquiring the free bubble density, the cream time, the gel time, the viscosity losing time, the outer diameter of the steel pipe, the length of the steel pipe, the angle of a spray gun, the distance between the spray gun and the steel pipe, the spraying time from the spray gun head to the pipe body, the required thickness of the heat preservation layer, the increased density of each layer and the spraying flow rate of the polyurethane raw material;
the range determining module of the rotation speed is used for determining the range of the rotation speed according to the milky white time, the gel time, the viscosity losing time and the spraying time;
the spraying layer number determining module is used for determining the spraying layer number according to the free bubble density, the outer diameter of the steel pipe and the thickness of the heat insulation layer;
the polyurethane heat-insulating layer density determining module is used for determining the density of the polyurethane heat-insulating layer according to the number of spraying layers, the density of free bubbles and the density increased by each layer;
the steel pipe advancing speed and autorotation speed ratio determination module is used for determining the ratio of the advancing speed and the autorotation speed of the steel pipe according to the angle of the spray gun, the distance between the spray gun and the steel pipe and the spraying layer number;
the steel pipe advancing speed range determining module is used for determining the range of the steel pipe advancing speed according to the spraying flow, the outer diameter of the steel pipe, the thickness of the heat-insulating layer, the density of the heat-insulating layer and the length of the steel pipe;
and the steel pipe advancing speed and rotation speed determining module is used for determining the advancing speed and the rotation speed of the steel pipe according to the advancing speed range and the rotation speed range of the steel pipe and the ratio of the advancing speed and the rotation speed of the steel pipe.
In a third aspect, an electronic device is provided, which includes a memory, a processor, and computer instructions stored in the memory and executed on the processor, wherein the computer instructions, when executed by the processor, perform the steps of the method for determining the spraying parameters of the polyurethane thermal insulation pipe.
In a fourth aspect, a computer-readable storage medium is provided for storing computer instructions, which when executed by a processor, perform the steps of a method for determining spray parameters of a polyurethane insulated pipe.
Compared with the prior art, the invention has the beneficial effects that:
1. when the spraying parameters are determined, the size of the steel pipe, the thickness of the heat insulation layer and the spraying performance of equipment are considered, and the foaming performance and the actual production experience of the polyurethane raw materials are also considered, so that the finally obtained spraying parameters can be more suitable for actual production, the traditional theoretical calculation mode is broken through, the finally obtained spraying parameters can be directly used for guiding the actual production, and the difficulties of raw material waste and rework caused by continuous spraying debugging are avoided.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a flow chart of the method disclosed in example 1;
FIG. 2 is a schematic view of the spray width;
fig. 3 is a schematic diagram of the calculation template disclosed in example 1.
Detailed Description
The invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1
The spraying winding method thermal insulation pipe forming technology has two production processes in China, namely an intermittent production process and a continuous production process. Although the two processes are different in conveying mode, the process principle is based on spraying polyurethane by a spraying machine, and in order to realize accurate calculation of spraying parameters, in the embodiment, a method for determining the spraying parameters of a polyurethane thermal insulation pipe is disclosed, as shown in fig. 1, the method comprises the following steps:
obtaining free bubble density rho 1, milky white time S1, gel time S3, viscosity loss time S4, steel pipe outer diameter D0, steel pipe length L, spray gun angle alpha, distance D between a spray gun and the steel pipe, spray time S2 from the spray gun head to a pipe body, required insulation layer thickness D2, increased density rho 3 of each layer and spray flow Q of a polyurethane raw material;
determining the range of the rotation speed r according to the milky white time S1, the gel time S3, the viscosity losing time S4 and the spraying time S2;
determining the number N of spraying layers according to the free bubble density rho 1, the outer diameter D0 of the steel pipe and the thickness D2 of the heat-insulating layer;
determining the density rho 2 of the polyurethane heat-insulating layer according to the number N of spraying layers, the density rho 1 of free bubbles and the increased density rho 3 of each layer;
determining the ratio of the advancing speed V and the autorotation speed r of the steel pipe according to the angle alpha of the spray gun, the distance d between the spray gun and the steel pipe and the spraying layer number N;
determining the range of the advancing speed V of the steel pipe according to the spraying flow Q, the outer diameter D0 of the steel pipe, the thickness D2 of the heat-insulating layer, the density rho 2 of the heat-insulating layer and the length L of the steel pipe;
and determining the steel pipe advancing speed V and the rotation speed r according to the range of the steel pipe advancing speed V, the range of the rotation speed r and the ratio of the steel pipe advancing speed V to the rotation speed r.
Specifically, in the embodiment, a set of spraying parameter calculation model is established by effectively combining the foaming performance of the polyurethane raw material, the spraying performance of the equipment and the actual production experience, so that the traditional theoretical calculation mode is broken through, and the method can be directly used for guiding the actual production.
Wherein the free foam density rho 1, the milk white time S1, the gel time S3 and the viscosity loss time S4 belong to the foaming performance of the polyurethane raw material; the angle alpha of the spray gun, the distance d between the spray gun and the steel pipe, the spraying time S2 from the spray gun head to the pipe body and the spraying flow Q belong to the spraying performance of the equipment.
The theoretical parameters of the spraying parameters of the insulating layer are calculated as follows:
1) The spraying heat preservation is carried out in an unconstrained state, the density of the heat preservation layer is improved and cannot be calculated by the current theory, only the rule is summarized by practical experience, and the density rho 2 of the sprayed polyurethane heat preservation layer is directly related to the density rho 1 of free bubbles and the number N of spraying layers; the density rho 2 of the polyurethane heat-insulating layer obtained through actual production is the sum of the foam density rho 1 and the stacking and superposition of the heat-insulating layer and the layer crusts, and specifically comprises the following steps:
ρ2＝ρ1+(N-1)×ρ3；
where ρ 3 is the increased density of each layer.
2) The weight M1 of the polyurethane required by spraying is obtained by calculation according to the outer diameter D0 of the steel pipe, the length L of the steel pipe, the thickness D2 of the required heat-insulating layer and the density rho 2 of the polyurethane heat-insulating layer, and specifically:
M1＝π×(D0+d2)×d2×ρ2×0.001×L。
in the actual spraying production process, there is a loss of polyurethane, about 11%, and in order to make the finally obtained weight of polyurethane more consistent with the production, after obtaining the weight of polyurethane M1, taking into account the loss, the weight of polyurethane M to obtain the final actual demand is calculated, specifically:
M＝M1×(1+11％)。
4) The advancing speed V of the steel pipe is determined by the actually required polyurethane weight M and the spraying flow Q, and specifically comprises the following steps:
V＝L/[M1×(1+11％)/Q]。
5) The number of spraying layers N is determined according to the required polyurethane weight M, the spraying flow Q, the distance d between the spray gun and the steel pipe and the angle alpha of the spray gun, and specifically:
N＝[2×d×tan(α/2)]/[M×(1+11％)/Q]。
6) The thickness d1 of each sprayed layer is determined according to the thickness d2 of the heat-insulating layer and the number N of sprayed layers, and specifically: d1= d2/N.
7) The pitch P of the spraying process is the ratio of the advancing speed V and the autorotation speed r of the steel pipe, and is specifically as follows: p = V/r.
In the actual production process, the free bubble density rho 1, the milky white time S1, the gel time S3, the non-stick time S4, the outer diameter D0 of the steel pipe, the length L of the steel pipe, the spraying time S2 from the spray gun head to the pipe body, the angle alpha of the spray gun, the distance D between the spray gun and the steel pipe and the required thickness D2 of the heat preservation layer can be known in advance.
The spraying parameters to be determined are three data of the advancing speed V of the steel pipe, the flow Q of the spray gun and the autorotation speed r.
If the advancing speed V of the steel pipe is calculated according to the theoretical weight, the deviation between the sprayed heat-insulating layer and the requirement is large, so that the spraying parameters are determined by combining the theory and the practice.
The method comprises the following specific steps:
(1) In order to prevent the rolling cracking of the sprayed polyurethane layer and ensure that the polyurethane layer has the best bonding effect, the sum of the spraying time S2 and the time required by the steel pipe to rotate for one circle is set to be more than the milky time S1 and less than the viscosity losing time S4, and the gel time S3 is kept, and the specific relationship is as follows: 60/r + S2 is more than S1;60/r + S2 is less than S4;60/r + S2= S3, S3 min <S3<S3 max 。
The range of the rotation speed r is determined according to the time relationship, and the range is as follows: r < 60/(S1-S2);
r > 60/(S4-S2); r = 60/(S3-S2). Meanwhile, the faster the rotation speed r is combined with the actual production condition, the more uniform and smoother the spraying appearance of the heat-insulating layer, and therefore the r value is preferably a large value.
(2) Determining the number N of spraying layers according to the density rho 1 of the free bubbles, the outer diameter D0 of the steel pipe and the thickness D2 of the heat-insulating layer, wherein the specific process is as follows:
(1) determining the thickness D1 of each sprayed layer according to the density rho 1 of the free bubbles and the outer diameter D0 of the steel pipe, and specifically:
determining the range of the thickness D1 of each sprayed layer according to the density rho 1 of the free bubbles and the outer diameter D0 of the steel pipe, wherein the range is as follows: d1 is not more than rho 1/(pi multiplied by D0);
and determining the thickness d1 of each sprayed layer according to the range of the thickness d1 of each sprayed layer and the optimal value range of the thickness d1 of each sprayed layer.
In actual production, the optimal value range of the thickness d1 of each sprayed layer is 3-6mm.
(2) And determining the number N of sprayed layers according to the thickness d1 of each sprayed layer and the thickness d2 of the heat preservation layer, wherein N = d2/d1, and N is an integer.
(3) And determining the density rho 2 of the polyurethane insulation layer according to the number N of the sprayed layers, the density rho 1 of the free bubbles and the density rho 3 increased by each layer, wherein rho 2= rho 1+ (N-1). Times.rho 3.
In specific implementation, the increased density ρ 3 of each layer is determined according to the actual production range, which is generally: 1-2.
(4) And determining the ratio of the advancing speed V and the autorotation speed r of the steel pipe according to the angle alpha of the spray gun, the distance d between the spray gun and the steel pipe and the spraying layer number N.
As shown in fig. 2, the number of sprayed layers N = [2 × d × tan (α/2) ]/P ] of the heat-insulating pipe within one spraying width; wherein the pitch P = V/r.
And determining a pitch P according to the angle alpha of the spray gun, the distance d between the spray gun and the steel pipe and the spraying layer number N, and determining the ratio of the advancing speed V to the autorotation speed r of the steel pipe according to the fact that the pitch P is equal to the ratio of the advancing speed V to the autorotation speed r of the steel pipe.
(5) And determining the range of the advancing speed V of the steel pipe according to the spraying flow Q, the outer diameter D0 of the steel pipe, the thickness D2 of the heat-insulating layer, the density rho 2 of the heat-insulating layer and the length L of the steel pipe.
Specifically, the method comprises the following steps: according to the outer diameter D0 of the steel pipe, the length L of the steel pipe, the required thickness D2 of the heat preservation layer and the density rho 2 of the polyurethane heat preservation layer, the weight M of the polyurethane required actually is determined, and the range of the advancing speed V of the steel pipe is determined according to the weight M of the polyurethane required actually and the spraying flow Q, specifically:
V≤L/[π×(D0+d2)×d2×ρ2×0.001×L×(1+11％)/Q]。
the spraying flow Q is determined according to the parameter range given by the spraying machine, preferably, the intermediate value in the parameter range is taken, for example, when the parameter range given by the spraying machine is: at 121-150g/s, the spray flow rate Q is preferably: 135g/s.
(6) And determining the r value and the V value according to the range of the steel pipe advancing speed V, the range of the rotation speed r and the ratio of the steel pipe advancing speed V to the rotation speed r.
Wherein the value of r is an integer, and the value of r is determined according to the relation between the integer and the inequality, the range of the advancing speed V of the steel pipe, the range of the rotation speed r and the ratio of the advancing speed V of the steel pipe to the rotation speed r. For example, conventional material properties: the milk white time S1 ranges from 4 seconds to 8 seconds, the gel time S3 ranges from 9 seconds to 20 seconds, the viscosity loss time S4 ranges from 15 seconds to 26 seconds, and the spraying speed S2 is actually determined to be 3 seconds; and then according to the inequality relation: 60/r + S2 is more than S1;60/r + S2 is less than S4;60/r + S2= S3; the range of the rotation speed r is determined according to the time relationship, and the range is as follows: r is less than 60/(S1-S2); r > 60/(S4-S2); r = 60/(S3-S2). And if the r value is an integer, taking one of 6/7/8/9/10. The higher the rotation speed is, the more flat and uniform the appearance of the heat-insulating layer is. So that r preferably takes the value 10. Spraying layer number N = [2 Xd Xtan (alpha/2) ]/P ] according to the heat preservation pipe; pitch P = V/r; firstly, calculating: p = [2 × d × tan (α/2) ]/N; wherein the value of N has been determined by item (2).
After the P, r value is determined, the V value is determined according to the relationship between the steel pipe advancing speed V and the rotation speed r, P = V/r.
And finally determining three spraying parameters of the advancing speed V of the steel pipe, the flow Q of the spray gun and the autorotation speed r through the steps.
In order to facilitate the acquisition and display of parameters, the calculation model of the spraying parameters is set in a form of a table, as shown in fig. 3, input ports for acquiring the parameters are arranged in the table, after the acquired parameter data are input into the table, the calculation model of the spraying parameters automatically calculates the spraying parameters according to the parameter data, and the calculated spraying parameters are displayed under the parameters corresponding to the table.
And adjusting the spraying parameters by adjusting the data of each parameter in the table so as to obtain the spraying parameters which are most consistent with actual production.
The method for determining the spraying parameters of the polyurethane thermal insulation pipe disclosed by the embodiment is characterized by comprising the following steps of (1) determining the spraying parameters of the polyurethane thermal insulation pipe according to the characteristics of the performance of raw materials, the characteristics of spraying rotation and forward spiral motion and the accumulated experience of actual production; the three are effectively combined, and the determined spraying parameters can be directly used for guidance and application of actual production. The difficulty of raw material waste and rework caused by continuous spraying and debugging is avoided.
Example 2
In this embodiment, a system for determining spraying parameters of a polyurethane thermal insulation pipe is disclosed, including:
the data acquisition module is used for acquiring the free bubble density, the cream time, the gel time, the viscosity losing time, the outer diameter of the steel pipe, the length of the steel pipe, the angle of a spray gun, the distance between the spray gun and the steel pipe, the spraying time from the spray gun head to the pipe body, the required thickness of the heat preservation layer, the increased density of each layer and the spraying flow rate of the polyurethane raw material;
the range determining module of the rotation speed is used for determining the range of the rotation speed according to the milky white time, the gel time, the viscosity losing time and the spraying time;
the spraying layer number determining module is used for determining the spraying layer number according to the free bubble density, the outer diameter of the steel pipe and the thickness of the heat insulation layer;
the polyurethane heat-insulating layer density determining module is used for determining the density of the polyurethane heat-insulating layer according to the number of spraying layers, the density of free bubbles and the increased density of each layer;
the steel pipe advancing speed and autorotation speed ratio determination module is used for determining the ratio of the advancing speed and the autorotation speed of the steel pipe according to the angle of the spray gun, the distance between the spray gun and the steel pipe and the spraying layer number;
the steel pipe advancing speed range determining module is used for determining the range of the steel pipe advancing speed according to the spraying flow, the outer diameter of the steel pipe, the thickness of the heat-insulating layer, the density of the heat-insulating layer and the length of the steel pipe;
and the steel pipe advancing speed and rotation speed determining module is used for determining the advancing speed and the rotation speed of the steel pipe according to the advancing speed range and the rotation speed range of the steel pipe and the ratio of the advancing speed and the rotation speed of the steel pipe.
Example 3
In this embodiment, an electronic device is disclosed, which comprises a memory, a processor and computer instructions stored in the memory and executed on the processor, wherein the computer instructions, when executed by the processor, perform the steps of the method for determining the spraying parameters of the polyurethane thermal insulation pipe disclosed in embodiment 1.
Example 4
In this embodiment, a computer readable storage medium is disclosed for storing computer instructions that, when executed by a processor, perform the steps described in the method for determining spray parameters of a polyurethane insulated pipe disclosed in embodiment 1.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method for determining spraying parameters of a polyurethane thermal insulation pipe is characterized by comprising the following steps:
obtaining the free foam density, the milk white time, the gel time, the viscosity losing time, the outer diameter of the steel pipe, the length of the steel pipe, the angle of a spray gun, the distance between the spray gun and the steel pipe, the spraying time from the spray gun head to the pipe body, the required thickness of the heat preservation layer, the increased density of each layer and the spraying flow rate of the polyurethane raw material;
determining the range of the rotation speed according to the milky white time, the gel time, the viscosity losing time and the spraying time;
determining the number of spraying layers according to the density of the free bubbles, the outer diameter of the steel pipe and the thickness of the heat-insulating layer;
determining the density of the polyurethane heat-insulating layer according to the number of spraying layers, the density of the free bubbles and the increased density of each layer;
determining the ratio of the advancing speed and the autorotation speed of the steel pipe according to the angle of the spray gun, the distance between the spray gun and the steel pipe and the spraying layer number;
determining the range of the advancing speed of the steel pipe according to the spraying flow, the outer diameter of the steel pipe, the thickness of the heat-insulating layer, the density of the heat-insulating layer and the length of the steel pipe;
and determining the advancing speed and the rotation speed of the steel pipe according to the advancing speed range and the rotation speed range of the steel pipe and the ratio of the advancing speed to the rotation speed of the steel pipe.
2. The method for determining the spraying parameters of the polyurethane thermal insulation pipe according to claim 1, wherein the actually required polyurethane weight is determined according to the outer diameter of the steel pipe, the length of the steel pipe, the required thickness of the thermal insulation layer and the density of the polyurethane thermal insulation layer, and the range of the advancing speed of the steel pipe is determined according to the spraying flow and the actually required polyurethane weight.
3. The method for determining the spraying parameters of the polyurethane thermal insulation pipe as claimed in claim 2, wherein the loss of polyurethane in the spraying production process is also taken into consideration when determining the actually required weight of polyurethane.
4. The method for determining the spraying parameters of the polyurethane thermal insulation pipe according to claim 1, wherein the range of the rotation speed is determined according to the condition that the sum of the spraying time and the time required for the steel pipe to rotate for one circle is more than the cream time and less than the viscosity losing time and is kept in the gel time.
5. The method for determining the spraying parameters of the polyurethane thermal insulation pipe according to claim 1, wherein the specific process for determining the number of the spraying layers is as follows:
determining the thickness of each sprayed layer according to the density of the free bubbles and the outer diameter of the steel pipe;
and determining the number of sprayed layers according to the thickness of each sprayed layer and the thickness of the heat-insulating layer.
6. The method for determining the spraying parameters of the polyurethane thermal insulation pipe according to claim 5, wherein the range of the thickness of each sprayed layer is determined according to the free bubble density and the outer diameter of the steel pipe;
and determining the thickness of each sprayed layer according to the range of the thickness of each sprayed layer and the optimal value range of the thickness of each sprayed layer.
7. The method for determining the spraying parameters of the polyurethane thermal insulation pipe according to claim 1, wherein the autorotation speed is an integer.
8. A polyurethane insulating tube spraying parameter determining system is characterized by comprising:
the data acquisition module is used for acquiring the free bubble density, the cream time, the gel time, the viscosity losing time, the outer diameter of the steel pipe, the length of the steel pipe, the angle of a spray gun, the distance between the spray gun and the steel pipe, the spraying time from the spray gun head to the pipe body, the required thickness of the heat preservation layer, the increased density of each layer and the spraying flow rate of the polyurethane raw material;
the range determining module of the rotation speed is used for determining the range of the rotation speed according to the milky white time, the gel time, the viscosity losing time and the spraying time;
the spraying layer number determining module is used for determining the spraying layer number according to the free bubble density, the outer diameter of the steel pipe and the thickness of the heat insulation layer;
the polyurethane heat-insulating layer density determining module is used for determining the density of the polyurethane heat-insulating layer according to the number of spraying layers, the density of free bubbles and the increased density of each layer;
the steel pipe advancing speed and autorotation speed ratio determination module is used for determining the ratio of the advancing speed and the autorotation speed of the steel pipe according to the angle of the spray gun, the distance between the spray gun and the steel pipe and the spraying layer number;
the steel pipe advancing speed range determining module is used for determining the range of the steel pipe advancing speed according to the spraying flow, the outer diameter of the steel pipe, the thickness of the heat-insulating layer, the density of the heat-insulating layer and the length of the steel pipe;
and the steel pipe advancing speed and rotation speed determining module is used for determining the advancing speed and the rotation speed of the steel pipe according to the advancing speed range of the steel pipe, the rotation speed range and the ratio of the advancing speed to the rotation speed of the steel pipe.
9. An electronic device comprising a memory and a processor and computer instructions stored on the memory and executed on the processor, the computer instructions when executed by the processor performing the steps of a method according to any one of claims 1 to 7.
10. A computer-readable storage medium storing computer instructions which, when executed by a processor, perform the steps of a method according to any one of claims 1 to 7.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0623393D0 (en) * | 2006-11-23 | 2007-01-03 | Baxenden Chem | A method of applying thermal insulation |
| CN111420819A (en) * | 2020-03-31 | 2020-07-17 | 联想(北京)有限公司 | Spraying operation control method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0623393D0 (en) * | 2006-11-23 | 2007-01-03 | Baxenden Chem | A method of applying thermal insulation |
| CN111420819A (en) * | 2020-03-31 | 2020-07-17 | 联想(北京)有限公司 | Spraying operation control method and device |
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