CN116176008B - Raw material process flow control system - Google Patents
Raw material process flow control system Download PDFInfo
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- CN116176008B CN116176008B CN202310449246.6A CN202310449246A CN116176008B CN 116176008 B CN116176008 B CN 116176008B CN 202310449246 A CN202310449246 A CN 202310449246A CN 116176008 B CN116176008 B CN 116176008B
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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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
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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
- B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
- B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
- B29C31/042—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds
- B29C31/044—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds with moving heads for distributing liquid or viscous material into the moulds
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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
- B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
- B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
- B29C31/06—Feeding of the material to be moulded, e.g. into a mould cavity in measured doses, e.g. by weighting
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/007—Tempering units for temperature control of moulds or cores, e.g. comprising heat exchangers, controlled valves, temperature-controlled circuits for fluids
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0288—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process
- B29C35/0294—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process using tempering units for temperature control of moulds or cores
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
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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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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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
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The application provides a raw material process flow control system, which comprises: the automatic feeding device comprises a working material tank system, a metering subsystem, an automatic feeding subsystem and an auxiliary subsystem; the HP-RTM process has the advantages of quick mold filling and good infiltration effect, obviously reduces bubbles and reduces the porosity; the high-activity resin is used, so that the production period is shortened, and the process stability and the repeatability are high; the release agent has excellent surface effect of the workpiece and small thickness and shape deviation, and can realize low-cost, short-period and high-quality production; the method has the characteristics of high pressure, high flow accuracy, continuous injection time of 300s and suitability for rapid curing of resin; meanwhile, the flow control system of the raw material process has the characteristics of high repeated injection precision, uniform mixing, stable performance, simple and convenient operation, high production efficiency and the like; meanwhile, in order to adapt to the short beat of the HP-RTM process, a high-precision flowmeter and a pressure sensor are adopted for closed-loop control, so that the flow stability and the pressure stability are ensured.
Description
Technical Field
The application relates to the technical field of material flow control, in particular to a raw material process flow control system.
Background
In the production of new energy automobiles, aerospace, wind power and other industries, resin is often required to be filled in equipment for increasing the quality and strength of the equipment, and the flow of raw materials is required to be monitored in the process of filling the resin, so that accurate flow control is ensured to be realized; however, the existing flow control system for the raw material process has the defects of complex structure, higher cost, complex operation, longer continuous injection time, reduced infiltration degree of the prefabricated member, prolonged production period and influence on production benefit.
In the prior art, application number CN202010174475.8 discloses a design and implementation method of a continuous process control strategy with a recovery process based on PCS7, and aims at the defects of material waste, low yield and the like of the traditional continuous process system, comprehensively considers multiple angles such as safety, production optimization, energy conservation and the like, analyzes the system characteristics by using an SDG graph, develops an improved cascade-ratio control strategy with the recovery process, and establishes a control idea of 8 parts of the whole system, and completely designs a complete set of control schemes such as hardware configuration, CFC, parallel SFC and the like based on PCS 7. Simulation is carried out on the designed strategy by adopting an advanced multifunctional process control experimental device SMPT-1000, and an operation result shows that the method can be fully-automatic and stably operated, so that the material recycling rate and the product yield are obviously improved, and the safety, the practicability and the robustness are better; however, the structure is complex, the cost is high, and the operation is complex.
In the second prior art, application number CN201810076120.8 discloses a flow control method, first, a small signal disturbance Δf is applied to a pump operating frequency at any relative steady-state moment of a flow control system, so as to obtain a relational expression of a corresponding flow variation value Δq (t) and a relative steady-state pressure value P. Acquiring a time constant of delta q (t), and further obtaining pressure P; secondly, obtaining a lift characteristic curve of each pump passing through points (Q, P) on a Q-H plane and an intersection point of the lift curve and a corresponding high-efficiency interval boundary; finally, the high-efficiency operation performance parameters are obtained, and then the pump with the optimal performance parameters is selected to work, so that the flow control system is ensured to be in high-efficiency operation. The time and cost required by the installation and debugging of the pressure sensor and the auxiliary processing circuit are saved, so that the system is simpler in structure, lower in cost and higher in operation efficiency, the service life and reliability of the system are improved, and reliable guarantee is provided for the safe and efficient operation of the flow control system; but the control accuracy is low, which affects the flow control accuracy of the raw material.
Third, application number: CN202211451266.9 discloses a method for detecting and controlling the liquid level of a mixed bed of ion exchange resin, which comprises adding a sampling nipple on an exhaust flange on the top of the mixed bed, leading to an upper pressure transmitter installed at the same level through a pressure-taking pipeline, and determining the position number as PT101; a lower pressure transmitter is arranged at the lower part of the mixed bed, and the position number is PT103; PT101 and PT103 are connected into a computer system to form floating point numbers, the variable names are PT_101 and PT_103, the liquid level and the top gas pressure of the solution are transmitted to a lower pressure transmitter through a pressure taking pipeline by liquid in a mixed bed, and the specific gravity of the solution is 1kg/l; the mixed bed liquid level variable name is LI_103 control system in normal operation, and a conversion program is programmed according to LI_103= (PT_103-PT_101)/10; the mixed resin level li_104 in the mixed bed is relatively fixed, when li_103 is less than li_108: li_108=li_103; the material level near the discharge port on the mixed bed: li_107=li_103-li_108; after the mixed bed backwashing process, mixed resin in the mixed bed is layered, the sum of the layered material levels is equal to the material level after the mixed resin, acid/alkali is added for regeneration after layered drainage reaches a certain liquid level, the resin level is basically unchanged in the flushing process, and the liquid level of flushing water is LI_103; but the degree of automation is low and the process is complex.
The prior art I, the prior art II and the prior art III have the problems of complex structure, complex operation, inaccurate raw material flow control and influence on the process quality, so the application provides a raw material process flow control system which has high pressure, high flow precision and continuous injection time of 300 seconds.
Disclosure of Invention
In order to solve the technical problems, the application provides a raw material process flow control system, which comprises:
the metering subsystem is responsible for collecting flow signals of raw materials flowing out of the working material tank subsystem and monitoring and controlling the flow;
the automatic feeding subsystem is responsible for feeding in raw materials and setting liquid level;
and the auxiliary subsystem is responsible for realizing the defoaming of raw materials according to the flow monitoring and control results and providing a control function of high-pressure resin transfer molding.
Optionally, the working tank subsystem specifically comprises a polyol tank, an isocyanate tank and a release agent tank.
Optionally, the working tank subsystem comprises:
the heating function module is responsible for respectively heating the polyol, the isocyanate and the release agent to the required temperature, and performing closed-loop control on the required temperature through the platinum resistance sensor;
the liquid level monitoring module is responsible for monitoring the liquid levels of the polyol, the isocyanate and the release agent through a liquid level meter and realizing automatic feeding through cooperation with the automatic feeding subsystem;
and the stirring function module is responsible for realizing uniform heating of the polyol, the isocyanate and the release agent through a paddle stirrer under the driving of a motor.
Optionally, the heating function module includes:
the platinum resistance sensing submodule is responsible for collecting temperature analog signals of polyol, isocyanate and release agent and converting the temperature analog signals into temperature digital signals;
the closed-loop control sub-module is responsible for carrying out closed-loop control on the temperature digital signal according to the control model;
and the heating execution sub-module is responsible for heating the polyol, the isocyanate and the release agent according to the instruction of the closed loop control sub-module.
Optionally, the metering subsystem includes:
the flowmeter module is responsible for measuring the fluid flow flowing out of the polyol tank and the isocyanate tank;
the frequency converter module is responsible for controlling and changing the running power of the feed pump set and the metering pump through the working power frequency of the motor;
the feeding pump group module is in charge of operating according to the instruction of the operating power of the frequency converter module, so that the transportation of the polyol and the isocyanate is realized;
and the metering pump module is responsible for adjusting the conveying amount by adjusting the eccentric distance of the eccentric wheel and changing the stroke of the embolism when the conveying amount of the polyol and the isocyanate is changed.
Optionally, the automatic feeding subsystem includes:
the liquid level acquisition module is responsible for acquiring the current liquid levels of the polyol, the isocyanate and the release agent through the liquid level monitoring module;
the liquid level setting module is responsible for setting the feeding liquid levels of the polyol, the isocyanate and the release agent according to the process requirements;
the liquid level comparison module is in charge of acquiring a liquid level change value in a certain time period of the liquid level acquisition module, calculating the liquid level change value of the polyol, the isocyanate and the release agent in the time period, and if the liquid level change value does not reach the liquid level value required by the process, improving the speed of the feeding control module;
and the feeding control module is in charge of receiving the instruction of the liquid level comparison module and adjusting the feeding speed in real time.
Optionally, the auxiliary subsystem comprises:
the vacuum control module is responsible for realizing the defoaming treatment of the polyol, the isocyanate and the release agent under the vacuum condition, stirring the polyol, the isocyanate and the release agent and sending out bubbles;
the temperature control module is responsible for heating the subsystem of the working tank and the pipeline thereof;
the circulation switching module is responsible for realizing the circulation of the polyol, the isocyanate and the release agent when the raw material process flow control system is not in operation and when the raw material process flow control system is in operation;
the hydraulic control module is responsible for providing switching hydraulic power for the hydraulic high-low pressure switching valve, realizing switching between low-pressure circulation and high-pressure circulation, and simultaneously providing power for opening and closing a gun head of a raw material process flow control system; the hydraulic control module adopts an energy accumulator, and the pre-pressure is 80bar;
the electric control module is responsible for realizing the control of a program of a raw material process flow control system through the PLC;
and the filtering control module is responsible for realizing the filtering of the polyol, the isocyanate and the release agent.
Optionally, the heating mode of the temperature control module comprises a die temperature machine and an air heater, the die temperature machine directly heats the subsystem of the working material tank, the air heater heats a pipeline of the subsystem of the working material tank, and the temperature control precision of the die temperature machine and the air heater is +/-2 ℃.
Optionally, the circulation switching module switches circulation in non-working and working states through the hydraulic high-low pressure switching valve; the circulation in the non-working state is low-pressure circulation, and the polyol, isocyanate and release agent cannot pass through the gun head of the raw material process flow control system; the circulation in operation is high-pressure circulation, and the injection opening and injection time are controlled by the electric appliance control module.
Optionally, the filtering control module is provided with a low-pressure filter at the front end of the pipeline of the metering subsystem and a high-pressure filter at the rear end of the pipeline of the metering subsystem.
The working tank subsystem of the application holds the polyol, the isocyanate and the release agent, and simultaneously realizes heating, liquid level monitoring and stirring of the polyol, the isocyanate and the release agent; the special material comprises a polyol tank (POLY), an isocyanate tank (ISO) and a release agent tank (ITM), wherein the effective volume of the polyol tank (POLY) and the isocyanate tank (ISO) is 300L, and the effective volume of the release agent tank (ITM) is 25L; the vacuum degree of a polyol tank (POLY), an isocyanate tank (ISO) and a release agent tank (ITM) is more than 0.002MPa, and the vacuum flow of the polyol tank, the isocyanate tank and the release agent tank are all more than or equal to 20L/s, and the defoaming is carried out for the raw materials; the metering subsystem monitors and controls the flow of the polyalcohol, isocyanate and release agent flowing out of the working tank subsystem; the automatic feeding subsystem is responsible for feeding polyol, isocyanate and a release agent and setting the liquid level; the auxiliary subsystem realizes the defoaming of polyol, isocyanate and a release agent and provides a control function of high-pressure resin transfer molding; according to the scheme, the working material pot system is arranged to hold the polyol, the isocyanate and the release agent, meanwhile, the heating, the liquid level monitoring and the stirring of the polyol, the isocyanate and the release agent are realized, the temperature control precision of the material in use is realized by heating the polyol, the isocyanate and the release agent, the control of different temperatures of different materials is respectively realized, and the quality of a process of high-pressure resin transfer molding can be effectively improved; the flow of the polyol, the isocyanate and the release agent is monitored through the metering subsystem, so that the performance of the high-pressure resin can be effectively ensured, the processing quality of equipment is improved, and the manufacturing cost is reduced to a certain extent; the automatic feeding subsystem is adopted to realize the setting of the feeding liquid levels of the polyol and the isocyanate, so that the automatic feeding of the polyol and the isocyanate is realized, the setting of the liquid levels is realized, the feeding is automatically controlled according to the set liquid levels, and the complexity of manual control is greatly reduced; the control of high-pressure resin transfer molding is realized through the auxiliary subsystem, high-pressure mixed injection is realized under the action of the preformed piece and the steel mould, the impregnation and solidification of the resin to the fiber are completed under high pressure, and the processing of equipment such as new energy automobiles, aerospace, wind power and the like with low cost, short period and high quality is realized;
the HP-RTM process of the embodiment has the advantages of quick mold filling and good infiltration effect, obviously reduces bubbles and reduces the porosity; the high-activity resin is used, so that the production period is shortened, and the process stability and the repeatability are high; the release agent has excellent surface effect of the workpiece and small thickness and shape deviation, and can realize low-cost, short-period (mass) and high-quality production; the flow control system for the raw material process has the characteristics of high pressure, high flow precision and continuous injection time of 300s, and is suitable for rapidly curing resin; meanwhile, the flow control system of the raw material process has the characteristics of high repeated injection precision, uniform mixing, stable performance, simple and convenient operation, high production efficiency and the like; meanwhile, in order to adapt to the short beat (3-8 min) of the HP-RTM process, an overall system structure is independently developed, a high-precision flowmeter and a pressure sensor are adopted for closed-loop control, and the stability of flow and pressure are guaranteed; the equipment cost is reduced, and the manufacturing period is shortened, so that the development of the new energy automobile industry is promoted, and the monopoly of foreign equipment technology is broken.
In summary, the embodiment has the advantages of simple structure, easy operation, low cost, short production period, capacity of adapting the flow and the proportion to the value of the rapid curing system, localization of main components and the like.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the application is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:
FIG. 1 is a block diagram of a raw material process flow control system in example 1 of the present application;
FIG. 2 is a block diagram of a system of a work material tank according to embodiment 2 of the present application;
FIG. 3 is a block diagram of a heating function module in embodiment 3 of the present application;
FIG. 4 is a block diagram of a computing subsystem in accordance with embodiment 4 of the present application;
FIG. 5 is a block diagram of an automatic loading subsystem in embodiment 6 of the present application;
FIG. 6 is a block diagram of an auxiliary subsystem in embodiment 7 of the present application;
FIG. 7 is a flow chart of the control method of the raw material process flow control system in embodiment 8 of the present application.
Detailed Description
The preferred embodiments of the present application will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present application only, and are not intended to limit the present application.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application as detailed in the accompanying claims. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1: as shown in fig. 1, an embodiment of the present application provides a raw material process flow control system, including:
the working tank subsystem is responsible for holding raw materials for a process and simultaneously realizing heating, liquid level monitoring and stirring of the raw materials; the raw materials comprise polyol, isocyanate and a release agent, and meanwhile, the heating, liquid level monitoring and stirring of the polyol, the isocyanate and the release agent are realized; the special material comprises a polyol tank (POLY), an isocyanate tank (ISO) and a release agent tank (ITM), wherein the effective volume of the polyol tank (POLY) and the isocyanate tank (ISO) is 300L, and the effective volume of the release agent tank (ITM) is 25L; the vacuum degree of a polyol tank (POLY), an isocyanate tank (ISO) and a release agent tank (ITM) is more than 0.002MPa, and the vacuum flow of the polyol tank, the isocyanate tank and the release agent tank are all more than or equal to 20L/s, and the defoaming is carried out for the raw materials;
the metering subsystem is responsible for monitoring and controlling the flow of the raw materials flowing out of the working tank subsystem; thereby allowing the raw materials to be mixed in a range 84 of volume ratios (ISO: POLY: ITM): 100: 2.9-60: 100:2, outputting the corresponding raw materials;
the automatic feeding subsystem is responsible for feeding raw materials and setting liquid level;
the auxiliary subsystem is responsible for realizing the defoaming of raw materials and providing a control function of the flow of the raw materials formed by high-pressure resin transfer molding;
the working principle and beneficial effects of the technical scheme are as follows: the working tank subsystem of the embodiment holds the polyol, the isocyanate and the release agent, and simultaneously realizes heating, liquid level monitoring and stirring of the polyol, the isocyanate and the release agent; the special material comprises a polyol tank (POLY), an isocyanate tank (ISO) and a release agent tank (ITM), wherein the effective volume of the polyol tank (POLY) and the isocyanate tank (ISO) is 300L, and the effective volume of the release agent tank (ITM) is 25L; the vacuum degree of a polyol tank (POLY), an isocyanate tank (ISO) and a release agent tank (ITM) is more than 0.002MPa, and the vacuum flow of the polyol tank, the isocyanate tank and the release agent tank are all more than or equal to 20L/s, and the defoaming is carried out for the raw materials; the metering subsystem monitors and controls the flow of the polyalcohol, isocyanate and release agent flowing out of the working tank subsystem; the automatic feeding subsystem is responsible for feeding polyol, isocyanate and a release agent and setting the liquid level; the auxiliary subsystem realizes the defoaming of polyol, isocyanate and a release agent and provides a control function of high-pressure resin transfer molding; according to the scheme, the working material pot system is arranged to hold the polyol, the isocyanate and the release agent, meanwhile, the heating, the liquid level monitoring and the stirring of the polyol, the isocyanate and the release agent are realized, the temperature control precision of the material in use is realized by heating the polyol, the isocyanate and the release agent, the control of different temperatures of different materials is respectively realized, and the quality of a process of high-pressure resin transfer molding can be effectively improved; the flow of the polyol, the isocyanate and the release agent is monitored through the metering subsystem, so that the performance of the high-pressure resin can be effectively ensured, the processing quality of equipment is improved, and the manufacturing cost is reduced to a certain extent; the automatic feeding subsystem is adopted to realize the setting of the feeding liquid levels of the polyol and the isocyanate, so that the automatic feeding of the polyol and the isocyanate is realized, the setting of the liquid levels is realized, the feeding is automatically controlled according to the set liquid levels, and the complexity of manual control is greatly reduced; the control of high-pressure resin transfer molding is realized through the auxiliary subsystem, high-pressure mixed injection is realized under the action of the preformed piece and the steel mould, the impregnation and solidification of the resin to the fiber are completed under high pressure, and the processing of equipment such as new energy automobiles, aerospace, wind power and the like with low cost, short period and high quality is realized;
the HP-RTM process for the transfer molding of the high-pressure resin has the advantages of quick mold filling, good infiltration effect, obvious reduction of bubbles and reduction of porosity; the high-activity resin is used, so that the production period is shortened, and the process stability and the repeatability are high; the release agent has excellent surface effect of the workpiece and small thickness and shape deviation, and can realize low-cost, short-period (mass) and high-quality production; the flow control system for the raw material process has the characteristics of high pressure, high flow precision and continuous injection time of 300s, and is suitable for rapidly curing resin; meanwhile, the flow control system of the raw material process has the characteristics of high repeated injection precision, uniform mixing, stable performance, simple and convenient operation, high production efficiency and the like; meanwhile, in order to adapt to the short beat (3-8 min) of the HP-RTM process, an overall system structure is independently developed, a high-precision flowmeter and a pressure sensor are adopted for closed-loop control, and the stability of flow and pressure are guaranteed; the equipment cost is reduced, and the manufacturing period is shortened, so that the development of the new energy automobile industry is promoted, and the monopoly of foreign equipment technology is broken.
In summary, the embodiment has the advantages of simple structure, easy operation, low cost, short production period, capacity of adapting the flow and the proportion to the value of the rapid curing system, localization of main components and the like.
Example 2: as shown in fig. 2, on the basis of embodiment 1, the working tank subsystem provided in the embodiment of the present application includes:
the heating function module is responsible for respectively heating the polyol, the isocyanate and the release agent to the required temperature, and performing closed-loop control on the required temperature through the platinum resistance sensor;
the liquid level monitoring module is responsible for monitoring the liquid levels of the polyol, the isocyanate and the release agent through a liquid level meter and realizing automatic feeding through cooperation with the automatic feeding subsystem;
the stirring function module is responsible for realizing uniform heating of polyol, isocyanate and release agent through a paddle stirrer under the drive of a motor and realizing defoaming treatment;
the working principle and beneficial effects of the technical scheme are as follows: the heating function module of the embodiment respectively heats the polyol, the isocyanate and the release agent to the required temperature, and performs closed-loop control on the required temperature through a platinum resistance sensor; the liquid level monitoring module monitors the liquid levels of the polyol, the isocyanate and the release agent through a liquid level meter and is matched with the automatic feeding subsystem to realize automatic feeding; the stirring functional module is driven by a motor, so that the polyol, the isocyanate and the release agent are uniformly heated by a paddle stirrer, and the defoaming treatment is realized; according to the scheme, the temperature control of the polyol, the isocyanate and the release agent is realized through the heating functional module, the required temperature is subjected to closed-loop control, the accurate control of the required working temperature of the polyol, the isocyanate and the release agent is realized, the pipeline of a full-flow working material pot system is realized through heating, heat preservation and cooling, the original material performance of the polyol, the isocyanate and the release agent is ensured, the performance of raw materials is ensured, the quality of an HP-RTM process is effectively improved, the production cost is also reduced, the heating functional module can carry out closed-loop control by adopting 2 sets of PT100 platinum resistance temperature, the temperature control precision is +/-2 ℃, the working temperature of the polyol and the isocyanate is 80 ℃, and the working temperature of the release agent is 50 ℃; the liquid level monitoring module is adopted to realize automatic monitoring of the liquid level, and is matched with the automatic feeding subsystem to realize liquid level monitoring in the feeding process, so that the feeding precision is ensured, and the accuracy of raw material conveying is effectively ensured; the stirring functional module realizes uniform heating of the polyol, the isocyanate and the release agent, and deaeration treatment, so that the conveyed raw materials meet the use requirements better, and the best performance is ensured; in summary, this example simultaneously achieves heating, level monitoring and agitation of the polyol, isocyanate and mold release agent.
Example 3: as shown in fig. 3, on the basis of embodiment 2, the heating function module provided in this embodiment includes:
the platinum resistance sensing submodule is responsible for collecting temperature analog signals of polyol, isocyanate and release agent and converting the temperature analog signals into temperature digital signals;
the closed-loop control sub-module is responsible for carrying out closed-loop control on the temperature digital signal according to the control model;
the equation for the control model is:
where k represents the time, P represents the heating power of the heating execution sub-module,indicating the heating power of the heating execution sub-module required at time k+1, +.>Indicating the heating power of the heating execution sub-module required at the kth time,representing a proportional gain for correcting the heating power; />Representing an integral gain for eliminating accumulated error of the closed loop control submodule; />A signal indicating a differential gain for introducing a corrected heating power when the integrated error increases to a threshold value; />The error between the set temperature and the actual temperature of the polyol, isocyanate or release agent at the kth time, m represents the current error +.>Time node of->；/>An error between the set temperature and the actual temperature of the polyol, isocyanate or mold release agent at time k-1;
the heating execution sub-module is responsible for heating the polyol, the isocyanate and the release agent according to the instruction of the closed-loop control sub-module;
the working principle and beneficial effects of the technical scheme are as follows: the platinum resistance sensing submodule of the embodiment collects temperature analog signals of polyol, isocyanate and release agent and converts the temperature analog signals into temperature digital signals; the closed-loop control sub-module is responsible for carrying out closed-loop control on the temperature digital signal according to the control model; the heating execution submodule heats the polyol, the isocyanate and the release agent according to the instruction of the closed-loop control submodule; according to the scheme, the heating execution submodule is used for heating the polyol, the isocyanate and the release agent, so that the performance of the polyol, the isocyanate and the release agent is effectively improved, and the quality of an HP-RTM process is improved; the temperature digital signal is subjected to closed loop control according to the control model, so that the control of errors between the set temperature and the actual temperature of the polyol, the isocyanate or the release agent is realized, the actual temperature is more close to the set temperature, meanwhile, the monitoring and the correction of the temperature at different moments are realized, and the use efficiency of the polyol, the isocyanate and the release agent is improved.
Example 4: as shown in fig. 4, on the basis of embodiment 1, a metering subsystem provided in an embodiment of the present application includes:
the flowmeter module is responsible for measuring the fluid flow flowing out of the polyol tank and the isocyanate tank;
the frequency converter module is responsible for controlling and changing the running power of the feed pump set and the metering pump through the working power frequency of the motor;
the feeding pump group module is in charge of operating according to the instruction of the operating power of the frequency converter module, so that the transportation of the polyol and the isocyanate is realized;
the metering pump module is used for adjusting the conveying amount by adjusting the eccentric distance of the eccentric wheel and changing the stroke of the embolism when the conveying amount of the polyol and the isocyanate is changed;
the working principle and beneficial effects of the technical scheme are as follows: the flow meter module of the embodiment measures the flow of fluid flowing out of the polyol tank and the isocyanate tank; the frequency converter module controls and changes the running power of the feed pump set and the metering pump through the working power frequency of the motor; the feeding pump set module operates according to the instruction of the operating power of the frequency converter module, so that the transportation of the polyol and the isocyanate is realized; when the conveying amount of the polyol and the isocyanate is changed, the metering pump module changes the stroke of the embolism by adjusting the eccentric distance of the eccentric wheel so as to realize the adjustment of the conveying amount; according to the scheme, the flow rate is monitored by measuring the flow rate of the fluid through the flow meter module, so that accurate proportioning is conveniently realized; the frequency converter module realizes the adjustment of the running power of the feed pump group and the metering pump, and realizes the accurate transportation of the polyol and the isocyanate; the metering pump module realizes automatic adjustment of the conveying amount of polyol and isocyanate, and saves the complexity of manual adjustment; a closed-loop control system is formed by a flowmeter module, a frequency converter module, a feed pump module and a metering pump module, and the flow accuracy error is ensured to be +/-0.5%.
Example 5: on the basis of embodiment 4, the expression of the control equation for adjusting the delivery amount of the metering pump module provided by the embodiment of the application is as follows:
wherein Q represents the conveying amount,the rotational speed of the metering pump module is represented, D represents the eccentric distance of the eccentric wheel of the metering pump module, +.>Represents the volume of the metering pump module cavity, +.>Represents the leakage coefficient of the metering pump module,/->Represents the elastic modulus, < + >, of the oil in the metering pump module>Indicating the time during which the dosing pump module has completed a stroke of one embolism,/->Representing the rated power of the metering pump module;
the working principle and beneficial effects of the technical scheme are as follows: when the conveying amount of the polyol and the isocyanate is changed, the metering pump module of the embodiment changes the stroke of the embolism by adjusting the eccentric distance of the eccentric wheel so as to realize the adjustment of the conveying amount; the automatic adjustment of the conveying amount of polyol and isocyanate with changed conveying amount is realized, and the complicated manual adjustment is saved; a closed-loop control system is formed by a flowmeter module, a frequency converter module, a feed pump module and a metering pump module, and the flow accuracy error is ensured to be +/-0.5%.
Example 6: as shown in fig. 5, on the basis of embodiment 1, the automatic feeding subsystem provided in the embodiment of the present application includes:
the liquid level acquisition module is responsible for acquiring the current liquid levels of the polyol, the isocyanate and the release agent through the liquid level monitoring module;
the liquid level setting module is responsible for setting the feeding liquid levels of the polyol, the isocyanate and the release agent according to the process requirements;
the liquid level comparison module is in charge of acquiring a liquid level change value in a certain time period of the liquid level acquisition module, calculating the liquid level change value of the polyol, the isocyanate and the release agent in the time period, and if the liquid level change value does not reach the liquid level value required by the process, improving the speed of the feeding control module;
the feeding control module is in charge of receiving the instruction of the liquid level comparison module and adjusting the feeding speed in real time;
the working principle and beneficial effects of the technical scheme are as follows: the liquid level acquisition module of the embodiment acquires the current liquid level of the polyol, the isocyanate and the release agent through the liquid level monitoring module; the liquid level setting module sets the feeding liquid level of the polyol, the isocyanate and the release agent according to the process requirements; the liquid level comparison module acquires a liquid level change value in a certain time period of the liquid level acquisition module, calculates the liquid level change values of the polyol, the isocyanate and the release agent in the time period, and if the liquid level change value does not reach the liquid level value required by the process, the speed of the feeding control module is increased; the feeding control module receives the instruction of the liquid level comparison module and adjusts the feeding speed in real time; the scheme realizes the real-time acquisition and setting of the liquid level, realizes the automatic acquisition of the polyol, the isocyanate and the release agent, and improves the automatic control level of the HP-RTM process; the comparison between the set liquid level and the real-time liquid level change value is realized through the liquid level comparison module, so that the monitoring capability of liquid level change is improved; the feeding control module is used for adjusting the feeding speed, the automatic adjustment of the feeding speed is realized according to the instruction of the liquid level comparison module, the production efficiency is improved, and the stability and the beat of continuous production are ensured.
Example 7: as shown in fig. 6, on the basis of embodiment 1, the auxiliary subsystem provided in the embodiment of the present application includes:
the vacuum control module is responsible for realizing the defoaming treatment of the polyol, the isocyanate and the release agent under the vacuum condition, stirring the polyol, the isocyanate and the release agent and sending out bubbles;
the temperature control module is responsible for heating the working material tank subsystem and a pipeline thereof, the heating mode comprises a die temperature machine and a hot air blower, the die temperature machine directly heats the working material tank subsystem, the hot air blower heats the pipeline of the working material tank subsystem, and the temperature control precision of the die temperature machine and the hot air blower is +/-2 ℃;
the circulation switching module is responsible for realizing circulation of the polyol, the isocyanate and the release agent when the raw material process flow control system is not in operation and is in operation, and the circulation of the raw material process flow control system is switched by the hydraulic high-low pressure switching valve when the raw material process flow control system is not in operation and is in operation; the circulation in the non-working state is low-pressure circulation, and the polyol, isocyanate and release agent cannot pass through the gun head of the raw material process flow control system; the circulation in working is high-pressure circulation, and the electric appliance control module controls the injection starting and the injection time;
the hydraulic control module is responsible for providing switching hydraulic power for the hydraulic high-low pressure switching valve, realizing switching between low-pressure circulation and high-pressure circulation, and simultaneously providing power for opening and closing a gun head of a raw material process flow control system; the hydraulic control module adopts an energy accumulator, and the pre-pressure is 80bar;
the electric control module is responsible for realizing the control of a program of a raw material process flow control system through the PLC;
the filtering control module is responsible for realizing the filtration of polyol, isocyanate and release agent, a low-pressure filter is arranged at the front end of a pipeline of the metering subsystem, and a high-pressure filter is arranged at the rear end of the pipeline of the metering subsystem;
the working principle and beneficial effects of the technical scheme are as follows: the vacuum control module of the embodiment realizes the defoaming treatment of the polyol, the isocyanate and the release agent under the vacuum condition, and the polyol, the isocyanate and the release agent are stirred and the bubbles are sent out; the temperature control module is used for heating the working material tank subsystem and a pipeline thereof, the heating mode comprises a mold temperature machine and a hot air blower, the mold temperature machine directly heats the working material tank subsystem, the hot air blower is used for heating the pipeline of the working material tank subsystem, and the temperature control precision of the mold temperature machine and the hot air blower is +/-2 ℃; the circulation switching module is used for realizing circulation of the polyol, the isocyanate and the release agent when the raw material process flow control system is not in operation and is in operation, and the circulation of the raw material process flow control system is switched by the hydraulic high-low pressure switching valve when the raw material process flow control system is not in operation and is in operation; the circulation in the non-working state is low-pressure circulation, and the polyol, isocyanate and release agent cannot pass through the gun head of the raw material process flow control system; the circulation in working is high-pressure circulation, and the electric appliance control module controls the injection starting and the injection time; the hydraulic control module provides switching hydraulic power for the hydraulic high-low pressure switching valve, realizes switching of low-pressure circulation and high-pressure circulation, and provides power for opening and closing a gun head of a raw material process flow control system; the hydraulic control module adopts an energy accumulator, and the pre-pressure is 80bar; the electrical control module realizes the control of a program of a raw material process flow control system through the PLC; the filtering control module realizes the filtration of polyol, isocyanate and release agent, a low-pressure filter is arranged at the front end of a pipeline of the metering subsystem, and a high-pressure filter is arranged at the rear end of the pipeline of the metering subsystem; the scheme realizes the defoaming of the polyol, the isocyanate and the release agent through the vacuum control module, discharges air in the foam, improves the compactness of the polyol, the isocyanate and the release agent, and is beneficial to improving the quality and the quality of products; the heating of the polyol, the isocyanate and the release agent is realized through two different temperature control modes, and the heating of a pipeline is also realized, so that the polyol, the isocyanate and the release agent are effectively ensured to maintain the optimal performance in the conveying process; the two circulation modes are switched through the circulation switching module, the low-pressure circulation is applied to the circulation in the non-working state, and the injection gun head is not used in the design for guaranteeing the uniform temperature of raw materials, the uniform additives, the defoaming and the reduction of the energy consumption of equipment; the high-pressure circulation is applied to the circulation in working, the flow and the pressure in the circulation are stably kept at the process set values, and the injection starting time are controlled by the electric control system; the hydraulic control module provides hydraulic power for the circulation switching module to complete high-pressure and low-pressure circulation switching, and provides gun opening and closing power for the injection gun head, and as the pressure in the die can be extremely increased when the injection of the HP-RTM process is finished, an energy accumulator (pre-pressure 80 bar) is adopted in the hydraulic module to ensure that the whole hydraulic system provides stable working pressure; the electrical control module adopts a high-response PLC to carry out integral control on the equipment, so that the flow precision, the pressure precision, the temperature precision, the injection time and the integral stability of the equipment are ensured; the filtering control module is provided with a low-pressure filter (the filtering precision is 0.2 mm) at the front end of a pipeline of the metering part, and a high-pressure filter (the filtering precision is 0.025 mm) at the rear end of the pipeline, so that the precision and the service life of the metering pump set and the injection gun head are effectively protected; the control function of high-pressure resin transfer molding is provided by realizing the defoaming of the polyol, the isocyanate and the release agent.
Example 8: on the basis of embodiment 1-embodiment 7, the control method of the raw material process flow control system provided by the embodiment of the application comprises the following steps:
s100: the method comprises the steps that two raw materials of polyol (350-650 mPas at 25 ℃) and cyanate (175-250 mPas at 25 ℃) are respectively preheated by a temperature control module, the preheated raw materials are conveyed to a polyol tank and an isocyanate tank through an automatic feeding subsystem, and the raw materials of a release agent tank are manually added into the release agent tank;
s200: starting a low-pressure circulation function, wherein the low-pressure circulation function is to circulate the polyol, the isocyanate and the release agent through the respective pipelines and the metering subsystem respectively at smaller pressure and flow, and the polyol, the isocyanate and the release agent are circulated from the charging bucket, the pipelines, the metering subsystem, the circulation switching valve and the pipelines to the charging bucket in sequence without passing through the injection gun head;
s300: the raw materials are subjected to low-pressure circulation through the metering subsystem, so that the temperature uniformity of the raw materials and the uniformity of additives in the raw materials are ensured, and the additives in the raw materials are not precipitated; meanwhile, preparation is carried out for injection work, so that the raw materials reach a set pressure value (injection pressure: 0-15 MPa) and a set flow value (flow range: 50-180 g/s, flow precision: + -0.5%);
s400: the injection is switched from low-pressure circulation to high-pressure circulation (high-pressure circulation means that polyol, isocyanate and release agent are circulated through a pipeline and a metering subsystem respectively at set injection pressure and set injection flow rate, and the injection gun head is automatically switched to low-pressure circulation after the high-pressure circulation is completed by the pipeline, the metering subsystem, a circulation switching valve (switched from low-pressure circulation to high-pressure circulation) and the injection gun head (mixed) to a die so as to prepare for the next high-pressure circulation.
The working principle and beneficial effects of the technical scheme are as follows: firstly, two raw materials of polyol and cyanate ester are respectively preheated by a temperature control module, the preheated raw materials are conveyed into a polyol tank and an isocyanate tank through an automatic feeding subsystem, and the raw materials of a release agent tank are added into the release agent tank manually; secondly, starting a low-pressure circulation function, wherein the low-pressure circulation function means that polyol, isocyanate and release agent circulate through the respective pipelines and the metering subsystem respectively at smaller pressure and flow, and do not circulate through the injection gun head in sequence from the charging bucket, the pipelines, the metering subsystem, the circulation switching valve and the pipelines to the charging bucket; then, through a metering subsystem, the raw materials are subjected to low-pressure circulation, so that the temperature uniformity of the raw materials and the uniformity of additives in the raw materials are ensured, and the additives in the raw materials cannot be precipitated; simultaneously, preparation is carried out for injection work, so that the raw materials reach a set pressure value and a set flow value; finally, the injection is switched from low-pressure circulation to high-pressure circulation (the high-pressure circulation means that polyol, isocyanate and release agent are circulated through a pipeline and a metering subsystem respectively at set injection pressure and set injection flow rate, and the release agent is excellent in surface effect, small in thickness and shape deviation of a finished product, and capable of realizing low-cost, short-period (large-batch) and high-quality production;
it will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A raw material process flow control system, comprising:
the metering subsystem is responsible for collecting flow signals of raw materials flowing out of the working material tank subsystem and monitoring and controlling the flow;
the automatic feeding subsystem is responsible for feeding in raw materials and setting liquid level;
the auxiliary subsystem is responsible for realizing the defoaming of raw materials according to the flow monitoring and control results and providing a control function of high-pressure resin transfer molding;
a metering subsystem, comprising:
the flowmeter module is responsible for measuring the fluid flow flowing out of the polyol tank and the isocyanate tank;
the frequency converter module is responsible for controlling and changing the running power of the feed pump set and the metering pump through the working power frequency of the motor;
the feeding pump group module is in charge of operating according to the instruction of the operating power of the frequency converter module, so that the transportation of the polyol and the isocyanate is realized;
the metering pump module is used for adjusting the conveying amount by adjusting the eccentric distance of the eccentric wheel and changing the stroke of the embolism when the conveying amount of the polyol and the isocyanate is changed;
automatic feeding subsystem includes:
the liquid level acquisition module is responsible for acquiring the current liquid levels of the polyol, the isocyanate and the release agent through the liquid level monitoring module;
the liquid level setting module is responsible for setting the feeding liquid levels of the polyol, the isocyanate and the release agent according to the process requirements;
the liquid level comparison module is in charge of acquiring a liquid level change value in a certain time period of the liquid level acquisition module, calculating the liquid level change value of the polyol, the isocyanate and the release agent in the time period, and if the liquid level change value does not reach the liquid level value required by the process, improving the speed of the feeding control module;
and the feeding control module is in charge of receiving the instruction of the liquid level comparison module and adjusting the feeding speed in real time.
2. The raw material process flow control system of claim 1, wherein the working tank subsystem specifically comprises a polyol tank, an isocyanate tank, and a release agent tank.
3. The raw material process flow control system as set forth in claim 2 wherein the working tank subsystem comprises:
the heating function module is responsible for respectively heating the polyol, the isocyanate and the release agent to the required temperature, and performing closed-loop control on the required temperature through the platinum resistance sensor;
the liquid level monitoring module is responsible for monitoring the liquid levels of the polyol, the isocyanate and the release agent through a liquid level meter and realizing automatic feeding through cooperation with the automatic feeding subsystem;
and the stirring function module is responsible for realizing uniform heating of the polyol, the isocyanate and the release agent through a paddle stirrer under the driving of a motor.
4. A raw material process flow control system as set forth in claim 3 wherein the heating function module comprises:
the platinum resistance sensing submodule is responsible for collecting temperature analog signals of polyol, isocyanate and release agent and converting the temperature analog signals into temperature digital signals;
the closed-loop control sub-module is responsible for carrying out closed-loop control on the temperature digital signal according to the control model;
and the heating execution sub-module is responsible for heating the polyol, the isocyanate and the release agent according to the instruction of the closed loop control sub-module.
5. The raw material process flow control system of claim 1, wherein the auxiliary subsystem comprises:
the vacuum control module is responsible for realizing the defoaming treatment of the polyol, the isocyanate and the release agent under the vacuum condition, stirring the polyol, the isocyanate and the release agent and discharging bubbles;
the temperature control module is responsible for heating the subsystem of the working tank and the pipeline thereof;
the circulation switching module is responsible for realizing the circulation of the polyol, the isocyanate and the release agent when the raw material process flow control system is not in operation and when the raw material process flow control system is in operation;
the hydraulic control module is responsible for providing switching hydraulic power for the hydraulic high-low pressure switching valve, realizing switching between low-pressure circulation and high-pressure circulation, and simultaneously providing power for opening and closing a gun head of a raw material process flow control system; the hydraulic control module adopts an energy accumulator, and the pre-pressure is 80bar;
the electric control module is responsible for realizing the control of a program of a raw material process flow control system through the PLC;
and the filtering control module is responsible for realizing the filtering of the polyol, the isocyanate and the release agent.
6. The raw material process flow control system of claim 5, wherein the heating mode of the temperature control module comprises a die temperature machine and a hot air blower, the die temperature machine directly heats the working material tank subsystem, the hot air blower heats a pipeline of the working material tank subsystem, and the temperature control precision of the die temperature machine and the hot air blower is +/-2 ℃.
7. The raw material process flow control system of claim 5, wherein the circulation switching module is switched by the hydraulic high-low pressure switching valve when not in operation and when in operation; the circulation in the non-working state is low-pressure circulation, and the polyol, isocyanate and release agent cannot pass through the gun head of the raw material process flow control system; the circulation in operation is high-pressure circulation, and the injection opening and injection time are controlled by the electric appliance control module.
8. The raw material process flow control system of claim 5, wherein the filtration control module is provided with a low pressure filter at the front end of the piping of the metering subsystem and a high pressure filter at the rear end of the piping of the metering subsystem.
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| CN114311761A (en) * | 2022-01-05 | 2022-04-12 | 东北大学 | VARTM device and method integrating temperature, perfusion speed and pressure |
| CN115489142A (en) * | 2022-09-23 | 2022-12-20 | 中国航空制造技术研究院 | Resin injection pipeline system and flow measurement method thereof |
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