CN115107212B - Polyurethane step-by-step premixing system for refrigerator cabinet, control method and working procedure - Google Patents
Polyurethane step-by-step premixing system for refrigerator cabinet, control method and working procedure Download PDFInfo
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- CN115107212B CN115107212B CN202210819842.4A CN202210819842A CN115107212B CN 115107212 B CN115107212 B CN 115107212B CN 202210819842 A CN202210819842 A CN 202210819842A CN 115107212 B CN115107212 B CN 115107212B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
- C08J9/149—Mixtures of blowing agents covered by more than one of the groups C08J9/141 - C08J9/143
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2101/00—Manufacture of cellular products
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
- C08J2203/142—Halogenated saturated hydrocarbons, e.g. H3C-CF3
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/08—Polyurethanes from polyethers
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a polyurethane step-by-step premixing system for a refrigerator cabinet, a control method and working procedures, wherein the polyurethane step-by-step premixing system for the refrigerator cabinet comprises the following steps: the foaming agent device comprises a first foaming agent storage tank, a second foaming agent storage tank, a first white material storage tank, a second white material storage tank, a first cylinder, a second cylinder, a third cylinder, a fourth cylinder, a first white material premixing and stirring device, a second white material premixing and stirring device, a white material premixing control device and a white material premixing intermediate tank; the control method is realized by the white material premixing control device, the mass ratio and the specific gravity of the foaming agent and the white material are input into the white material premixing control device, the volume ratio of the foaming agent and the white material is output by the white material premixing control device, and the foaming agent and the white material are fed into the white material premixing stirring device by the cylinder which is opened and closed according to the volume ratio.
Description
Technical Field
The invention relates to the technical field of household appliance production processes, in particular to a polyurethane step-by-step premixing system for a refrigerator cabinet, a control method and procedures.
Background
The refrigerator is a refrigerating device for keeping food or other articles in a constant low-temperature cold state, a compressor, an ice maker and a cabinet or a box for freezing are arranged in the refrigerator, a foaming process is one of core procedures of refrigerator production, the refrigerator foaming process is to inject foaming raw materials meeting technical standards such as MDI, combined polyether, foaming agent and the like into a door body or the refrigerator body through polyurethane foaming equipment according to specific process requirements, and the process of chemical reaction between the foaming raw materials under specific process conditions is the polyurethane foaming of the refrigerator. The foaming process can improve the specific strength, dimensional stability, adhesive property and heat preservation performance of the refrigerator, and is different from the foaming process of common plastic, and has strict technical requirements and specific technical use.
The foaming process of the polyurethane refrigerator is a process of mixing raw materials of black materials (isocyanate components), white materials (polyol combination materials) and foaming agents through a specific foaming process, the foaming premixing process of the refrigerator white materials is an essential process in the foaming process of the refrigerator, pure white materials and foaming agents are uniformly mixed through the premixing process, the prepared mixture meets the process production requirements of further mixing with the mixture prepared by a black material premixing system, and the foaming material meeting the process standard is prepared.
Aiming at the problems of difficult control of the raw material proportion in the premixing process in the foaming and premixing process of the refrigerator white material, poor mixing uniformity of the white material and the foaming agent, high energy demand and the like, the invention discloses a polyurethane step-by-step premixing system for a refrigerator cabinet, a control method and a procedure.
Disclosure of Invention
In order to solve the problems that the proportion of premixed raw materials is difficult to control in a refrigerator white material foaming premixing process, so that the mixing uniformity of the prepared mixed materials is poor after the white materials and foaming agents are mixed, and the energy requirement of a premixing system is high, the invention discloses a polyurethane step-by-step premixing system for a refrigerator cabinet, a control method and a working procedure.
The invention discloses a polyurethane stepwise premixing system for a refrigerator cabinet, which comprises the following components in part by part:
a first foaming agent storage tank 1, a second foaming agent storage tank 2, a first white material storage tank 3, a second white material storage tank 4, a first cylinder 5, a second cylinder 6, a third cylinder 7, a fourth cylinder 8, a first white material premixing and stirring device 9, a second white material premixing and stirring device 10, a white material premixing and controlling device 11 and a white material premixing and stirring middle tank 12;
the first foaming agent storage tank 1, the second foaming agent storage tank 2 and the first white material storage tank 3 are respectively connected with the first air cylinder 5, the second air cylinder 6 and the third air cylinder 7; the first air cylinder 5, the second air cylinder 6 and the third air cylinder 7 are respectively connected with the first white material premixing and stirring device 9; the second white material storage tank 4 is connected with the fourth air cylinder 8, and the fourth air cylinder 8 is connected with the second white material premixing and stirring device 10; the first white material premixing and stirring device 9 is connected with the second white material premixing and stirring device 10, the second white material premixing and stirring device 10 is connected with the white material premixing and stirring control device 11, and the white material premixing and stirring control device 11 is connected with the white material premixing and stirring intermediate tank 12;
the white material premixing control device 11 is in communication connection with the first cylinder 5, the second cylinder 6, the third cylinder 7 and the fourth cylinder 8, and is used for controlling the opening and closing degree of the first cylinder 5, the second cylinder 6 and the third cylinder 7, and respectively introducing the first foaming agent, the second foaming agent and the first white material in the first foaming agent storage tank 1, the second foaming agent storage tank 2 and the first white material storage tank 3 into the first white material premixing stirring device 9; the white material premixing control device 11 is used for controlling the opening and closing degree of the fourth cylinder 8, and introducing the second white material in the second white material storage tank 4 into the second white material premixing stirring device 10;
in some embodiments of the present invention, the first blowing agent storage tank 1 and the second blowing agent storage tank 2 are used for storing a first blowing agent and a second blowing agent, respectively; the first white material storage tank 3 and the second white material storage tank 4 are respectively used for storing a first white material and a second white material;
in some embodiments of the present invention, the first white material premixing and stirring device 9 is used for stirring and mixing materials in the first white material premixing and stirring device 9;
in some embodiments of the present invention, the second white material premixing and stirring device 10 is used for stirring and mixing materials in the second white material premixing and stirring device 10;
in some embodiments of the present invention, the white material premixing intermediate tank 12 is used for storing the material mixed by the second white material premixing stirring device 10.
The invention discloses a control method for a polyurethane step-by-step premixing system for a refrigerator cabinet, which is realized by a white material premixing control device and comprises the following specific steps:
inputting a first foaming agent, a second foaming agent and the mass ratio of a first white material into a white material premixing control device, sequentially inputting the first foaming agent, the second foaming agent and the specific gravity of the first white material, outputting the first foaming agent, the second foaming agent and the volume ratio of the first white material by the white material premixing control device, determining the opening and closing degree of a first cylinder, a second cylinder and a third cylinder by the volume ratio, controlling the first foaming agent, the second foaming agent and the first white material to be conveyed into a first white material premixing stirring device for mixing to obtain a mixture, and conveying the mixture into a second white material premixing stirring device;
the mass of the second white material is input into the white material premixing control device, then the specific gravity of the second white material is input, the white material premixing control device outputs the volume of the second white material, the volume determines the opening and closing degree of the fourth cylinder, and the second white material is controlled to be conveyed into the second white material premixing and stirring device, so that the mixture in the second white material premixing and stirring device is mixed with the second white material.
The invention in a third aspect discloses a polyurethane step-by-step premixing procedure for a refrigerator cabinet, which is executed by adopting the polyurethane step-by-step premixing system for the refrigerator cabinet, and is characterized in that the polyurethane step-by-step premixing procedure for the refrigerator cabinet comprises the following steps:
respectively supplying a first foaming agent, a second foaming agent and a first white material to a first foaming agent storage tank, a second foaming agent storage tank and a first white material storage tank, starting a white material premixing control device, controlling the opening and closing degree of a first cylinder, a second cylinder and a third cylinder, supplying the first foaming agent, the second foaming agent and the first white material to a first white material premixing stirring device for stirring and mixing to prepare a mixture a, and supplying the mixture a to a second white material premixing stirring device;
the second white material is supplied to a second white material storage tank, a white material premixing control device is started, the opening and closing degree of a fourth cylinder is controlled, the second white material is supplied to a second white material premixing and stirring device, and the second white material premixing and stirring device is used for stirring and mixing the second white material and the mixture a to prepare a mixture b;
the mixture b is supplied to a white material premixing intermediate tank for storage, and the step premixing process is finished.
In some embodiments of the present invention, the starting the white material premixing control device controls the opening and closing degrees of the first cylinder, the second cylinder and the third cylinder, and the specific steps include:
firstly, the mass ratio of the first foaming agent, the second foaming agent and the first white material is input, the specific gravity of the first foaming agent, the second foaming agent and the first white material is respectively input, the white material premixing control device outputs the volume ratio of the first foaming agent, the second foaming agent and the first white material, and the opening and closing degree of the first cylinder, the second cylinder and the third cylinder is determined by the volume ratio of the first foaming agent, the second foaming agent and the first white material.
In some embodiments of the present invention, the starting the white material premixing control device to control the opening and closing degree of the fourth cylinder includes the following specific steps:
firstly, inputting the mass of the second white material, then inputting the specific gravity of the second white material, outputting the volume of the second white material by the white material premixing control device, and determining the opening and closing degree of the fourth cylinder by the volume of the second white material.
In some embodiments of the invention, the first blowing agent, the second blowing agent comprises one of cyclopentane, isopentane, HFC-245fa, LBA blowing agent, R134a, R152a, R600a, the first blowing agent, the second blowing agent being different;
in some embodiments of the invention, the first foaming agent is 13 parts, the second foaming agent is 2 parts, the first white material is 20-50 parts, and the second white material is 50-80 parts by weight;
in some embodiments of the invention, the first and second whites are polyether polyols, and the first and second whites add up to 100 parts.
According to the technical scheme, compared with the method that the white material is taken as a whole and is fed into the white material premixing and stirring device at one time, the mass ratio of the foaming agent to the total material (the total material is the foaming agent and the white material) is smaller, the opening and closing degree of the air cylinder controlling the feeding volume of the foaming agent is smaller, and compared with the problem that the mixing is uneven, the method is characterized in that the white material is fed into the first white material premixing and stirring device at two steps, the first white material and the second white material are sequentially fed, in the first premixing process, the mass ratio of the foaming agent to the total material (the total material is the foaming agent and the first white material) is amplified, the corresponding feeding volume ratio of the foaming agent is amplified, the air cylinder is further favorable for calculating the feeding volume of the foaming agent, the metering error of the feeding volume is reduced, the opening and closing ratio of the air cylinder controlling the feeding volume of the foaming agent is amplified, the air cylinder controlling the feeding volume ratio of the foaming agent is prevented from being too small, the problem that the mixing is uneven, the foaming agent and the first white material is fed into the first white material premixing and stirring device according to the volume ratio, the uniformity of the mixed material is effectively improved, the mixed material is fed into the second white material premixing and stirring device at the second white material premixing process, and the mixed material is premixed into the second white material premixing device in the second white material premixing process, and the first white material premixing process is more evenly mixed material evenly in the first white material premixing process. Meanwhile, when the ambient temperature is low, the viscosity is consistent with the original viscosity in the increasing degree, but the white material is premixed step by step to reduce the weight of the white material, so that the conveying pump can meet the conveying requirement without improving the rated power or heating the white material, thereby saving energy.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a diagram of a prior art white material premixing system;
FIG. 2 is a diagram of a polyurethane step-by-step premixing system for a refrigerator cabinet, provided by an embodiment of the invention;
FIG. 3 is a flowchart of a control method of a polyurethane step-by-step premixing system for controlling a refrigerator cabinet by using a white material premixing control device according to an embodiment of the present application;
fig. 4 is a flow chart of a polyurethane step-by-step premixing procedure for a refrigerator cabinet according to an embodiment of the application.
Reference numerals: 1-a first blowing agent storage tank; 2-a second blowing agent storage tank; 3-a first white material storage tank; 4-a second white material storage tank; 5-a first cylinder; 6-a second cylinder; 7-a third cylinder; 8-a fourth cylinder; 9-a first white material premixing and stirring device; 10-a second white material premixing and stirring device; 11-a white material premixing control device; 12-white material premixing middle tank.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof.
FIG. 1 is a diagram of a prior art white material premixing system;
in the prior art, for example: the method comprises the steps of respectively storing 100 parts by weight of white material, 14 parts by weight of first foaming agent and 2 parts by weight of second foaming agent in a white material storage tank, a first foaming agent storage tank and a second foaming agent storage tank, controlling opening and closing of a cylinder through a white material premixing control device, enabling the white material, the first foaming agent and the second foaming agent to be fed into the white material premixing and stirring device at one time, and enabling the foaming agent to occupy the white material and the foaming agent (the foaming agent comprises the first foaming agent and the second foaming agent) to occupy less total weight due to the fact that the white material is fed at one time, wherein when the specific gravity of the foaming agent is large, the volume of the foaming agent output by the white material premixing control device occupies less volume, so that the opening and closing of the cylinder for controlling the feeding volume of the foaming agent is small, the feeding volume of the foaming agent is difficult to control, and the problem of uneven mixing of the foaming agent and the white material exists. Meanwhile, when the ambient temperature is lower, the viscosity of the pure white material is increased, so that the working pressure of the conveying pump is overloaded, the rated power of the conveying pump is required to be increased, or the pure white material is subjected to heating treatment, and the viscosity is reduced and then premixed, so that the energy waste is caused.
According to the invention, the white materials are divided into the first white material and the second white material, the first foaming agent and the second foaming agent are mixed, and then the mixed materials and the second white material are mixed, so that the step premixing of the white materials and the foaming agent is realized, the problem of uneven mixing of the mixed materials caused by small weight of the foaming agent is solved, and the waste of energy is reduced.
As shown in fig. 2, a first aspect of the present invention provides a polyurethane step premix system for a refrigerator cabinet, comprising:
a first foaming agent storage tank 1, a second foaming agent storage tank 2, a first white material storage tank 3, a second white material storage tank 4, a first cylinder 5, a second cylinder 6, a third cylinder 7, a fourth cylinder 8, a first white material premixing and stirring device 9, a second white material premixing and stirring device 10, a white material premixing and controlling device 11 and a white material premixing and stirring middle tank 12;
the first foaming agent storage tank 1, the second foaming agent storage tank 2 and the first white material storage tank 3 are respectively connected with the first air cylinder 5, the second air cylinder 6 and the third air cylinder 7; the first air cylinder 5, the second air cylinder 6 and the third air cylinder 7 are respectively connected with the first white material premixing and stirring device 9; the second white material storage tank 4 is connected with the fourth air cylinder 8, and the fourth air cylinder 8 is connected with the second white material premixing and stirring device 10; the first white material premixing and stirring device 9 is connected with the second white material premixing and stirring device 10, the second white material premixing and stirring device 10 is connected with the white material premixing and stirring control device 11, and the white material premixing and stirring control device 11 is connected with the white material premixing and stirring intermediate tank 12;
the white material premixing control device 11 is in communication connection with the first cylinder 5, the second cylinder 6, the third cylinder 7 and the fourth cylinder 8, and is used for controlling the opening and closing degree of the first cylinder 5, the second cylinder 6 and the third cylinder 7, and respectively introducing the first foaming agent, the second foaming agent and the first white material in the first foaming agent storage tank 1, the second foaming agent storage tank 2 and the first white material storage tank 3 into the first white material premixing stirring device 9; the white material premixing control device 11 is used for controlling the opening and closing degree of the fourth cylinder 8, and introducing the second white material in the second white material storage tank 4 into the second white material premixing stirring device 10;
the first foaming agent storage tank 1 and the second foaming agent storage tank 2 are respectively used for storing a first foaming agent and a second foaming agent; the first white material storage tank 3 and the second white material storage tank 4 are respectively used for storing a first white material and a second white material;
the first white material premixing and stirring device 9 is used for stirring and mixing materials in the first white material premixing and stirring device 9;
the second white material premixing and stirring device 10 is used for stirring and mixing materials in the second white material premixing and stirring device 10;
the white material premixing intermediate tank 12 is used for storing the materials which are mixed by the second white material premixing stirring device 10.
In the premixing system disclosed by the invention, the white materials are divided into the first white materials and the second white materials, the first foaming agent and the second foaming agent are respectively stored in the first white material storage tank, the first foaming agent storage tank and the second foaming agent storage tank, the three tank bodies are connected with the first white material premixing and stirring device, the first step premixing of the first white materials, the first foaming agent and the second foaming agent is realized, the first white material premixing and stirring device is connected with the second white material premixing and stirring device, the mixed materials after the first step premixing are conveyed into the second white material premixing and stirring device, the second white materials are stored in the second white material storage tank, and then the mixed materials and the second white materials are mixed, so that the step premixing of the white materials and the foaming agent is realized, the problem of uneven mixing of the mixed materials caused by small weight of the foaming agent is solved, and the energy waste is reduced.
In order to control the polyurethane step premix system for refrigerator cabinets, a second aspect of the present invention provides a control method, as shown in fig. 3:
the control method is used for a polyurethane step-by-step premixing system for a refrigerator cabinet, and is realized by a white material premixing control device, and comprises the following specific steps:
inputting a first foaming agent, a second foaming agent and the mass ratio of a first white material into a white material premixing control device, sequentially inputting the first foaming agent, the second foaming agent and the specific gravity of the first white material, outputting the first foaming agent, the second foaming agent and the volume ratio of the first white material by the white material premixing control device, determining the opening and closing degree of a first cylinder, a second cylinder and a third cylinder by the volume ratio, controlling the first foaming agent, the second foaming agent and the first white material to be conveyed into a first white material premixing stirring device for mixing to obtain a mixture, and conveying the mixture into a second white material premixing stirring device;
the mass of the second white material is input into the white material premixing control device, then the specific gravity of the second white material is input, the white material premixing control device outputs the volume of the second white material, the volume determines the opening and closing degree of the fourth cylinder, and the second white material is controlled to be conveyed into the second white material premixing and stirring device, so that the mixture in the second white material premixing and stirring device is mixed with the second white material.
The step premixing of the white material and the foaming agent is realized through a white material premixing control system, and in the first step premixing process, for example: the weight portions are as follows: the mass ratio of 14 parts of first foaming agent cyclopentane, 2 parts of second foaming agent HFC-245fa and 30 parts of first white polyether polyol is respectively input into a white material premixing control system, and the specific gravity of the input first foaming agent, the second foaming agent and the first white material is 0.75g/cm in sequence 3 、1.32g/cm 3 、1.06g/cm 3 From the above, it can be seen that a pre-mixed first foaming is requiredThe mass ratio of the agent to the second foaming agent to the first white material is 14:2:30, the white material premixing control system is used for controlling the white material premixing according to the formula: the mass is equal to the input specific gravity multiplied by the volume, and the volume ratio of the first foaming agent to the second foaming agent to the first white material is calculated, so that the mass ratio and the specific gravity of the first foaming agent to the second foaming agent are input into a white material premixing control system, and the volume ratio of the white material premixing system to the output of the white material premixing control system is 18.67:1.52:28.30, the suction ratio of the corresponding first cylinder, second cylinder and third cylinder is 18.67 percent: 1.52%:28.30% of a cylinder, and according to the adsorption ratio, the first foaming agent, the second foaming agent and the first white material are fed into a first white material premixing and stirring device to be mixed, and compared with the process of feeding the white material and the foaming agent in one step in fig. 1, according to the same calculation method, in fig. 1, 14 parts of cyclopentane, 2 parts of HFC-245fa serving as the second foaming agent and 100 parts of polyether polyol serving as the white material are fed into the device according to the mass ratio of 14:2:100, inputting the mass ratio and specific gravity of the three materials into a white material premixing control system, and calculating to obtain the suction ratio of the first cylinder, the second cylinder and the third cylinder as 18.67 percent: 1.52%: 94.34%) and in the first premixing procedure, the mass ratio of the first foaming agent to the second foaming agent to the total mixture is enlarged, the volume ratio of the corresponding foaming agent to the total mixture is also enlarged, the suction ratio of the corresponding foaming agent cylinder is enlarged, and the foaming agent is fed according to the suction ratio, so that the metering feeding volume of the cylinder is facilitated, and the metering error is reduced.
In order to more clearly understand the feeding process of the foaming agent and the white material, the addition of the cylinder suction ratios can be regarded as a whole, and the suction ratios of the first cylinder, the second cylinder and the third cylinder are divided by the whole, so that the suction ratios of the first cylinder, the second cylinder and the third cylinder can be calculated, the foaming agent and the white material are fed according to the suction ratios of the first cylinder, the second cylinder, and the foaming agent are smaller in suction ratio, the first foaming agent and the second foaming agent are smaller in feeding process, the suction ratio of the third cylinder is enlarged, the feeding amount of the white material is larger, and therefore the mixing non-uniformity phenomenon exists among the first cylinder, the second cylinder and the third cylinder, the foaming agent and the white material are sequentially fed (the white material is divided into the first white material and the second white material), and in the first step of premixing process, the first white material is fed first, the white material is divided into two parts, so that the total mass ratio of the first foaming agent and the second foaming agent to the mixed material (the mixed material is the first foaming agent, the second foaming agent and the first white material) is increased, the volume ratio of the corresponding first foaming agent and the second foaming agent is enlarged, the suction ratio of the corresponding first foaming agent and the second foaming agent is enlarged, the feeding amount of the first foaming agent and the second foaming agent is increased when feeding, the feeding amount of the first foaming agent and the second foaming agent is increased, the feeding amount of the first white material is decreased, the metering feeding volume of a cylinder is further facilitated, the metering feeding error of the cylinder is reduced, the three materials can be mixed more uniformly, the problem that the feeding volume of the foaming agent is difficult to control when the cylinder is fed, the feeding volume error of the foaming agent is increased is avoided, meanwhile, the problem of uneven mixing of the mixed materials caused by too small volume ratio of the foaming agent is solved;
in the second step of premixing procedure, the white material is divided into two parts, the rest white material, namely 70 parts of the second white material polyether polyol is fed into the second white material premixing and stirring device, the white material premixing control system calculates that the fourth cylinder suction ratio is 66.04%, and the second white material is fed into the second white material premixing and stirring device according to the cylinder suction ratio, so that the mixture in the first step of premixing procedure can be mixed more uniformly. Meanwhile, when the ambient temperature is low, the viscosity is consistent with the original viscosity in the increasing degree, but the white material is premixed step by step to reduce the weight of the white material, so that the conveying pump can meet the conveying requirement without improving the rated power or heating the white material, thereby saving energy.
To achieve a stepwise premixing of the white material and the foaming agent, it is shown in fig. 4: the invention provides a polyurethane step-by-step premixing procedure for a refrigerator cabinet, which is executed by adopting a polyurethane step-by-step premixing system for the refrigerator cabinet, and is characterized by comprising the following steps of:
the method comprises the steps of respectively supplying a first foaming agent, a second foaming agent and a first white material to a first foaming agent storage tank, a second foaming agent storage tank and a first white material storage tank, starting a white material premixing control device, firstly inputting the mass ratio of the first foaming agent, the second foaming agent and the first white material, respectively inputting the specific gravity of the first foaming agent, the second foaming agent and the first white material, outputting the volume ratio of the first foaming agent, the second foaming agent and the first white material by the white material premixing control device, controlling the opening and closing degree of the first cylinder, the second foaming agent and the third cylinder by the volume ratio of the first foaming agent, the second foaming agent and the first white material, further controlling the opening and closing degree of the first cylinder, the second cylinder and the third cylinder, supplying the first foaming agent, the second foaming agent and the first white material to a first white material premixing stirring device, stirring and mixing to prepare a mixture, and supplying the mixture a to a second white material premixing stirring device;
the second white material is supplied to a second white material storage tank, a white material premixing control device is started, the mass of the second white material is firstly input, then the specific gravity of the second white material is input, the white material premixing control device outputs the volume of the second white material, the opening and closing degree of a fourth cylinder is determined by the volume of the second white material, and then the opening and closing degree of the fourth cylinder is controlled, the second white material is supplied to a second white material premixing and stirring device, and the second white material premixing and stirring device stirs and mixes the second white material and the mixture a to prepare a mixture b;
the mixture b is supplied to a white material premixing intermediate tank for storage, and the step premixing process is finished.
The first foaming agent is cyclopentane, the second foaming agent is HFC-245fa (1, 3-pentafluoropropane CAS number is 460-73-1), and the first foaming agent is 14 parts by weight and the second foaming agent is 2 parts by weight;
the first white material and the second white material are polyether polyol, and the first white material is 30 parts and the second white material is 70 parts by weight;
in another embodiment of the present invention, the first blowing agent is isopentane, the second blowing agent is LBA blowing agent (1-chloro-3, 3-trifluoropropene CAS No. 2730-43-0), the first blowing agent is 14 parts by weight, the second blowing agent is 2 parts by weight;
the first white material and the second white material are polyether polyol (CAS number 9003-11-6), and the first white material is 20 parts and the second white material is 80 parts by weight;
the parts by weight of the first foaming agent and the second foaming agent are not limited to the above-mentioned numerical values, and may be added according to actual production.
The white materials comprise, by weight, 20-50 parts of a first white material and 50-80 parts of a second white material, and when the sum of the first white material and the second white material is 100 parts, the white materials are especially 30 parts of the first white material and 70 parts of the second white material; or when the first white material is 20 parts and the second white material is 80 parts, in the first step premixing procedure, the white material and the foaming agent are mixed more uniformly, the opening and closing ratio of a cylinder for controlling the feeding of the foaming agent is increased, the feeding volume error of the foaming agent is smaller, and in the second step premixing procedure, the residual white material and the mixed material prepared by the first step premixing can lead each component to be mixed more uniformly. Meanwhile, when the ambient temperature is low, the viscosity is consistent with the original viscosity in the increasing degree, but the pure white material is premixed step by step to reduce the quantity of the pure white material, so that the conveying pump can meet the conveying requirement without improving the rated power or heating the pure white material, and further the energy consumption is reduced.
The foregoing detailed description has been provided for the purposes of illustration in connection with specific embodiments and exemplary examples, but such description is not to be construed as limiting the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications and improvements may be made to the technical solution of the present application and its embodiments without departing from the spirit and scope of the present application, and these all fall within the scope of the present application. The scope of the application is defined by the appended claims.
Claims (10)
1. A polyurethane step premix system for a refrigerator cabinet comprising: the foaming agent device comprises a first foaming agent storage tank (1), a second foaming agent storage tank (2), a first white material storage tank (3), a second white material storage tank (4), a first cylinder (5), a second cylinder (6), a third cylinder (7), a fourth cylinder (8), a first white material premixing and stirring device (9), a second white material premixing and stirring device (10), a white material premixing and stirring control device (11) and a white material premixing intermediate tank (12);
the first foaming agent storage tank (1), the second foaming agent storage tank (2) and the first white material storage tank (3) are respectively connected with the first air cylinder (5), the second air cylinder (6) and the third air cylinder (7); the first air cylinder (5), the second air cylinder (6) and the third air cylinder (7) are respectively connected with the first white material premixing and stirring device (9); the second white material storage tank (4) is connected with the fourth air cylinder (8), and the fourth air cylinder (8) is connected with the second white material premixing and stirring device (10); the first white material premixing and stirring device (9) is connected with the second white material premixing and stirring device (10), the second white material premixing and stirring device (10) is connected with the white material premixing and stirring control device (11), and the white material premixing and stirring control device (11) is connected with the white material premixing and stirring middle tank (12);
the white material premixing control device (11) is in communication connection with the first air cylinder (5), the second air cylinder (6), the third air cylinder (7) and the fourth air cylinder (8) and is used for controlling the opening and closing degree of the first air cylinder (5), the second air cylinder (6) and the third air cylinder (7), and the first foaming agent, the second foaming agent and the first white material in the first foaming agent storage tank (1), the second foaming agent storage tank (2) and the first white material storage tank (3) are respectively introduced into the first white material premixing stirring device (9); and the white material premixing control device (11) is used for controlling the opening and closing degree of the fourth cylinder (8) and introducing the second white material in the second white material storage tank (4) into the second white material premixing stirring device (10).
2. The polyurethane step premix system for refrigerator cabinets according to claim 1, wherein the first foaming agent storage tank (1) and the second foaming agent storage tank (2) are respectively used for storing a first foaming agent and a second foaming agent; the first white material storage tank (3) and the second white material storage tank (4) are respectively used for storing the first white material and the second white material.
3. The polyurethane step-by-step premixing system for refrigerator cabinets according to claim 1, characterized in that the first white material premixing stirring device (9) is used for stirring and mixing materials in the first white material premixing stirring device (9);
the second white material premixing and stirring device (10) is used for stirring and mixing materials in the second white material premixing and stirring device (10).
4. A polyurethane step premix system for refrigerator cabinets according to claim 3, characterized in that said white material premix run tank (12) is adapted to store the material after being mixed by said second white material premix stirring device (10).
5. A control method for the polyurethane step-by-step premixing system for refrigerator cabinets according to any one of claims 1 to 4, which is realized by a white material premixing control device, comprising the following specific steps:
inputting a first foaming agent, a second foaming agent and the mass ratio of a first white material into a white material premixing control device, sequentially inputting the first foaming agent, the second foaming agent and the specific gravity of the first white material, outputting the first foaming agent, the second foaming agent and the volume ratio of the first white material by the white material premixing control device, determining the opening and closing degree of a first cylinder, a second cylinder and a third cylinder by the volume ratio, controlling the first foaming agent, the second foaming agent and the first white material to be conveyed into a first white material premixing stirring device for mixing to obtain a mixture, and conveying the mixture into a second white material premixing stirring device;
the mass of the second white material is input into the white material premixing control device, then the specific gravity of the second white material is input, the white material premixing control device outputs the volume of the second white material, the volume determines the opening and closing degree of the fourth cylinder, and the second white material is controlled to be conveyed into the second white material premixing and stirring device, so that the mixture in the second white material premixing and stirring device is mixed with the second white material.
6. A polyurethane stepwise premixing process for a refrigerator cabinet, which is performed by using the polyurethane stepwise premixing system for a refrigerator cabinet according to any one of claims 1 to 4, characterized in that the polyurethane stepwise premixing process for a refrigerator cabinet comprises the steps of:
respectively supplying a first foaming agent, a second foaming agent and a first white material to a first foaming agent storage tank, a second foaming agent storage tank and a first white material storage tank, starting a white material premixing control device, controlling the opening and closing degree of a first cylinder, a second cylinder and a third cylinder, supplying the first foaming agent, the second foaming agent and the first white material to a first white material premixing stirring device for stirring and mixing to prepare a mixture a, and supplying the mixture a to a second white material premixing stirring device;
the second white material is supplied to a second white material storage tank, a white material premixing control device is started, the opening and closing degree of a fourth cylinder is controlled, the second white material is supplied to a second white material premixing and stirring device, and the second white material premixing and stirring device is used for stirring and mixing the second white material and the mixture a to prepare a mixture b;
the mixture b is supplied to a white material premixing intermediate tank for storage, and the step premixing process is finished.
7. The polyurethane stepwise premixing process for a refrigerator cabinet according to claim 6, wherein the starting of the white material premixing control device controls the opening and closing degree of the first cylinder, the second cylinder and the third cylinder, and the specific steps include:
firstly, the mass ratio of the first foaming agent, the second foaming agent and the first white material is input, the specific gravity of the first foaming agent, the second foaming agent and the first white material is respectively input, the white material premixing control device outputs the volume ratio of the first foaming agent, the second foaming agent and the first white material, and the opening and closing degree of the first cylinder, the second cylinder and the third cylinder is determined by the volume ratio of the first foaming agent, the second foaming agent and the first white material.
8. The polyurethane stepwise premixing process for a refrigerator cabinet according to claim 6, wherein the starting of the white material premixing control device controls the opening and closing degree of the fourth cylinder, and the specific steps include:
firstly, inputting the mass of the second white material, then inputting the specific gravity of the second white material, outputting the volume of the second white material by the white material premixing control device, and determining the opening and closing degree of the fourth cylinder by the volume of the second white material.
9. The stepwise polyurethane premix process for refrigerator cabinets according to claim 6, wherein the first blowing agent and the second blowing agent comprise one of cyclopentane, isopentane, HFC-245fa, LBA blowing agent, R134a, R152a, R600a, and the first blowing agent is different from the second blowing agent.
10. The stepwise polyurethane premixing process for refrigerator cabinets according to claim 6, wherein the first white material and the second white material are polyether polyol, and the sum of the first white material and the second white material is 100 parts by weight, and the first white material is 20-50 parts by weight and the second white material is 50-80 parts by weight.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000094466A (en) * | 1998-09-22 | 2000-04-04 | Sanyo Electric Co Ltd | Foaming machine for manufacture of flame-retardant hard urethane foam |
| CN204607903U (en) * | 2015-05-11 | 2015-09-02 | 南京林业大学 | A kind of system and device of premix lower boiling Fluorine containing olefine in polyether glycol |
| CN106364803A (en) * | 2016-12-02 | 2017-02-01 | 合肥美菱股份有限公司 | Ultralow-temperature biomedical storage box and manufacturing method thereof |
| CN107652500A (en) * | 2017-09-14 | 2018-02-02 | 浙江润阳新材料科技股份有限公司 | A kind of antistatic foaming material and preparation method thereof |
| CN111603963A (en) * | 2020-06-04 | 2020-09-01 | 镇江中化聚氨酯工业设备有限公司 | Online premixing system for raw materials of polyurethane insulation board |
| CN111732705A (en) * | 2020-06-18 | 2020-10-02 | 旭川化学（苏州）有限公司 | Polyurethane foam suitable for low-temperature use, composite material thereof and polyurethane seat |
| CN113024760A (en) * | 2021-03-16 | 2021-06-25 | 长虹美菱股份有限公司 | Polyurethane foaming material and refrigerator applying same |
-
2022
- 2022-07-12 CN CN202210819842.4A patent/CN115107212B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000094466A (en) * | 1998-09-22 | 2000-04-04 | Sanyo Electric Co Ltd | Foaming machine for manufacture of flame-retardant hard urethane foam |
| CN204607903U (en) * | 2015-05-11 | 2015-09-02 | 南京林业大学 | A kind of system and device of premix lower boiling Fluorine containing olefine in polyether glycol |
| CN106364803A (en) * | 2016-12-02 | 2017-02-01 | 合肥美菱股份有限公司 | Ultralow-temperature biomedical storage box and manufacturing method thereof |
| CN107652500A (en) * | 2017-09-14 | 2018-02-02 | 浙江润阳新材料科技股份有限公司 | A kind of antistatic foaming material and preparation method thereof |
| CN111603963A (en) * | 2020-06-04 | 2020-09-01 | 镇江中化聚氨酯工业设备有限公司 | Online premixing system for raw materials of polyurethane insulation board |
| CN111732705A (en) * | 2020-06-18 | 2020-10-02 | 旭川化学（苏州）有限公司 | Polyurethane foam suitable for low-temperature use, composite material thereof and polyurethane seat |
| CN113024760A (en) * | 2021-03-16 | 2021-06-25 | 长虹美菱股份有限公司 | Polyurethane foaming material and refrigerator applying same |
Non-Patent Citations (1)
| Title |
|---|
| 聚氨酯发泡系统选择方案;俞丽珍;常熟理工学院学报;第19卷(第04期);47-81 * |
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