A micro-foam deep cavity injection mold cavity core cooling device

Abstract

The present invention belongs to the technical field of mold cavity core cooling, and discloses a micro-foam deep cavity injection mold cavity core cooling device, which includes: a cavity, a mold cavity, a condensation controller, a water injection pipe, a venturi tube, a material injection pipe, a valve, a switch, a drain pipe, a temperature detection module, a central control module, a water flow detection module, a cooling temperature control module, and a timing module. The present invention can improve the accuracy of cooling water flow detection in a large cavity through a water flow detection module; at the same time, the fan motor speed is controlled through a cooling temperature control module to maintain the temperature of high-temperature cavity cooling water and the temperature of low-temperature cavity cooling water at a given value; it can avoid the problem of large changes and oscillations in cavity cooling water temperature caused by overshoot due to the use of PID control and inaccurate control.

Description

Technical Field

[0001] The invention belongs to the technical field of mold cavity core cooling, and in particular relates to a micro-foamed deep cavity injection mold cavity core cooling device. Background Art

[0002] Molds are various molds and tools used in industrial production to obtain the desired products by injection molding, blow molding, extrusion, die casting or forging molding, smelting, stamping and other methods. In short, molds are tools used to make molded objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the processing of the shape of the object by changing the physical state of the molded material. It is known as the "mother of industry". It is a tool that makes the blank into a part with a specific shape and size under the action of external force. It is widely used in punching, die forging, cold heading, extrusion, powder metallurgy pressing, pressure casting, and compression or injection molding of engineering plastics, rubber, ceramics and other products. The mold has a specific contour or inner cavity shape. The use of a contour shape with a cutting edge can make the blank separate (punch) according to the contour shape. The use of an inner cavity shape can make the blank obtain a corresponding three-dimensional shape. The mold generally consists of two parts: a movable mold and a fixed mold (or a punch and a die), which can be separated or combined. When separated, the part is taken out, and when closed, the blank is injected into the mold cavity for forming. The mold is a precision tool with a complex shape. It bears the expansion force of the blank and has high requirements for structural strength, rigidity, surface hardness, surface roughness and processing accuracy. The development level of mold production is one of the important indicators of the level of mechanical manufacturing. However, the existing micro-foam deep cavity injection mold cavity core cooling device cannot accurately detect the cooling water flow in the cavity, which affects the damage of the device due to excessive water injection; at the same time, the existing temperature control technology is prone to large changes and fluctuations in the cavity cooling water temperature.

[0003] Through the above analysis, the problems and defects of the prior art are as follows:

[0004] (1) The existing micro-foam deep cavity injection mold cavity core cooling device cannot accurately detect the cooling water flow in the cavity, which affects the device due to excessive water injection.

[0005] (2) Existing temperature control technology is prone to large changes and fluctuations in cavity cooling water temperature. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a cooling device for a cavity and core of a micro-foamed deep cavity injection mold.

[0007] The present invention is implemented in this way: a micro-foam deep cavity injection mold cavity core cooling device comprises:

[0008] Cavity, mold cavity, condensation controller, water injection pipe, material injection pipe, valve, switch, drain pipe, temperature detection module, central control module, water flow detection module, cooling temperature control module, timing module;

[0009] A mold cavity is provided in the mold cavity; a condensation controller is fixed by screws on the left side of the top surface of the mold cavity; a water injection pipe is embedded in the condensation controller; the water injection pipe is sleeved in the mold cavity; the bottom of the water injection pipe is connected to the venturi tube; a valve is fixed by screws in the center of the top surface of the mold cavity; a material injection pipe is embedded in the valve; the material injection pipe is sleeved in the mold cavity; a drain pipe is sleeved at the bottom right side of the mold cavity; a switch is provided on the top of the drain pipe; the condensation controller is provided on the upper left side; a temperature detection module is provided on the upper left side of the condensation controller; a timing module is provided on the lower left side of the condensation controller; a water flow detection module is provided on the upper right side of the condensation controller; a cooling temperature control module is provided on the lower right side of the condensation controller; a central control module is provided in the center of the condensation controller; the central control module is respectively connected to the temperature detection module, the water flow detection module, the cooling temperature control module, and the timing module through circuit lines;

[0010] A temperature detection module is connected to the central control module and is used to detect cooling water temperature data;

[0011] The central control module is connected with the temperature detection module, the water flow detection module, the cooling temperature control module and the timing module to control the normal operation of each module;

[0012] A water flow detection module is connected to the central control module and is used to detect the cooling water flow data in the cavity;

[0013] A cooling temperature control module is connected to the central control module and is used to control the cooling water temperature;

[0014] The timing module is connected to the central control module and is used to set the cooling time.

[0015] Further, the water flow detection module detection method is as follows:

[0016] (1) A venturi tube is arranged in the mold cavity, and the throat of the venturi tube or the vicinity of the throat of the venturi tube is selected as the water pressure detection point A, and the point far from the venturi tube is selected as the water pressure reference point B;

[0017] (2) Calculate the water flow rate Q in the cavity after the water pump in the cavity is turned on and the water pressure is stable according to the Bernoulli principle;

[0018]

[0019]

[0020] k is a structural parameter;

[0021] Among them, Da Indicates the inner diameter of the Venturi tube at the water pressure detection point A, D b Indicates the inner diameter of the cavity at the water pressure reference point B; P b1 It indicates the water pressure value at the water pressure reference point B after the water pump in the cavity is turned on and the water pressure is stable; P a1 It indicates the dynamic water pressure value at the water pressure detection point A after the water pump in the cavity is turned on and the water pressure is stable; P a1 <P b1 ;

[0022] When the water flow in the cavity is in a static state, the first static water pressure at the water pressure detection point A is P a0 , the second hydrostatic pressure at the water pressure reference point B is P b0 , where P a0 =P b0 ;

[0023] P b1 =(1+α)P b0 =(1+α)P a0 Formula (3);

[0024] Among them, α represents P b1 With P b0 The relative error between

[0025] but

[0026] Get the first hydrostatic pressure P when the water flow in the cavity at the water pressure detection point A is in a static state a0 And the dynamic water pressure value P after the water pump in the cavity is turned on and the water pressure is stable a1 , and then the water flow Q in the cavity is calculated according to formula (4) after the water pump in the cavity is turned on and the water pressure is stable.

[0027] Further, the method for determining the inner hole diameter at or near the throat of the Venturi tube is:

[0028] Calculate P a1 With P a0 The relative difference β(Q);

[0029] P a1 =(1-β(Q))P a0 (5)

[0030] but

[0031] According to formula (4) and formula (5), we can get:

[0032]

[0033] but

[0034] To ensure where β min P is within the normal water flow range Q a1 With P a0 The minimum relative difference of

[0035] but

[0036] Calculate the required Da according to formula (2) and formula (9).

[0037] Further, after the water pump in the cavity is turned on and the water pressure is stable, the calculation error of the water flow rate Q in the cavity is determined by:

[0038] According to formula (7), we can get:

[0039]

[0040] According to formula (10), after the water pump in the cavity is turned on and the water pressure is stable, the calculation error of the water flow Q in the cavity is

[0041] Since β(Q) ≥ β min ,but

[0042] According to β min The requirements are used to determine the calculation error range of the water flow rate Q in the cavity after the water pump in the cavity is turned on and the water pressure is stable.

[0043] Further, the cooling temperature control module control method is as follows:

[0044] 1) configuring the working parameters of the cooling water inverter; obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, and the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter;

[0045] 2) determining the water temperature change time of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter according to the temperature difference and the water temperature change coefficient; generating a control signal according to the water temperature change time; controlling the fan speed according to the control signal to control the temperature of the high-temperature cavity cooling water and the low-temperature cavity cooling water;

[0046] 3) When the temperature difference is greater than a first preset value, the water temperature variation coefficients of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature rise rate coefficients, and the water temperature variation times of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature rise rate times;

[0047] 4) When the temperature difference is less than or equal to the first preset value and greater than the second preset value, the water temperature variation coefficients of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature drop coefficients, and the water temperature variation times of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature drop times;

[0048] 5) controlling the output voltages of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter according to the control signal to control the fan speed.

[0049] Further, the step of obtaining the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter includes:

[0050] Obtaining the corresponding relationship between the current temperature of the high-temperature cavity cooling water and the water temperature variation coefficient;

[0051] The water temperature variation coefficient is determined according to the corresponding relationship and the current temperature of the high-temperature cavity cooling water.

[0052] Furthermore, the high-temperature cavity cooling water inverter includes: a first speed-up port and a first speed-down port.

[0053] Furthermore, the low-temperature cavity cooling water inverter includes: a second speed-up port and a second speed-down port.

[0054] Furthermore, the control method further includes:

[0055] When the temperature difference is greater than the first preset value, and the water temperature rise time is less than the first preset time, the first speed-up port and the second speed-up port are controlled to be in an open state, and the first speed-down port and the second speed-down port are controlled to be in a closed state;

[0056] When the temperature difference is less than or equal to the first preset value, greater than the second preset value, and the water temperature drop time is less than the second preset time, the first drop port and the second drop port are controlled to be in an open state, and the first increase port and the second increase port are controlled to be in a closed state;

[0057] When the first speed-up port and the second speed-up port are opened, and the first speed-down port and the second speed-down port are closed, the output voltages of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter increase;

[0058] When the first speed reduction port and the second speed reduction port are opened, and the first speed increase port and the second speed increase port are closed, the output voltage of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter is the same as before receiving the control signal, and the output voltage of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter remains unchanged.

[0059] Further, before obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, and the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter, it also includes:

[0060] Determine whether the current temperature of the high-temperature cavity cooling water is greater than a first maximum setting value, or whether the current temperature of the low-temperature cavity cooling water is greater than a second maximum setting value;

[0061] Correspondingly, the method of obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, as well as the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter, includes: if the current temperature of the high-temperature cavity cooling water is greater than the first maximum setting value, or the current temperature of the low-temperature cavity cooling water is greater than the second maximum setting value, then obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, as well as the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter.

[0062] In combination with the above technical solutions and the technical problems solved, please analyze the advantages and positive effects of the technical solutions to be protected by the present invention from the following aspects:

[0063] First, in view of the technical problems existing in the above-mentioned prior art and the difficulty of solving the problems, the technical solutions to be protected by the present invention and the results and data during the research and development process are closely combined to analyze in detail and deeply how the technical solutions of the present invention solve the technical problems, and some creative technical effects brought about after solving the problems. The specific description is as follows:

[0064] The present invention can improve the accuracy of cooling water flow detection in a large cavity through a water flow detection module; at the same time, the cooling temperature control module determines the temperature difference and the water temperature variation coefficient according to the temperature of the high-temperature cavity cooling water and the temperature setting value of the high-temperature cavity cooling water according to the control signal, and the control signal controls the output voltage of the high-temperature cavity cooling water inverter and the output voltage of the low-temperature cavity cooling water inverter to realize the speed control of the fan motor, and maintain the temperature of the high-temperature cavity cooling water and the temperature of the low-temperature cavity cooling water at a given value; it can avoid the problem of large changes and oscillations in the cavity cooling water temperature caused by overshoot due to the use of PID control and then inaccurate control.

[0065] Second, considering the technical solution as a whole or from the perspective of the product, the technical effects and advantages of the technical solution to be protected by the present invention are described in detail as follows:

[0066] The present invention can improve the accuracy of cooling water flow detection in a large cavity through a water flow detection module; at the same time, the cooling temperature control module determines the temperature difference and the water temperature variation coefficient according to the temperature of the high-temperature cavity cooling water and the temperature setting value of the high-temperature cavity cooling water according to the control signal, and the control signal controls the output voltage of the high-temperature cavity cooling water inverter and the output voltage of the low-temperature cavity cooling water inverter to realize the speed control of the fan motor, and maintain the temperature of the high-temperature cavity cooling water and the temperature of the low-temperature cavity cooling water at a given value; it can avoid the problem of large changes and oscillations in the cavity cooling water temperature caused by overshoot due to the use of PID control and then inaccurate control. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a structural block diagram of a micro-foamed deep cavity injection mold cavity core cooling device provided by an embodiment of the present invention.

[0068] Figure 2 It is a structural block diagram of a condensation controller provided in an embodiment of the present invention.

[0069] Figure 3 It is a flow chart of the water flow detection module detection method provided by an embodiment of the present invention.

[0070] Figure 4 It is a flow chart of a cooling temperature control module control method provided by an embodiment of the present invention.

[0071] In the figure: 1. Cavity; 2. Mold cavity; 3. Condensation controller; 4. Water injection pipe; 5. Venturi tube; 6. Injection pipe; 7. Valve; 8. Switch; 9. Drain pipe; 10. Temperature detection module; 11. Central control module; 12. Water flow detection module; 13. Cooling temperature control module; 14. Timing module. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0073] 1. Explanatory Examples In order to enable those skilled in the art to fully understand how to implement the present invention, this section provides an illustrative example that expands and describes the technical solution of the claims.

[0074] like Figure 1-2As shown, the micro-foam deep cavity injection mold cavity core cooling device provided by the embodiment of the present invention includes: a cavity 1, a mold cavity 2, a condensation controller 3, a water injection pipe 4, a venturi tube 5, an injection pipe 6, a valve 7, a switch 8, a drain pipe 9, a temperature detection module 10, a central control module 11, a water flow detection module 12, a cooling temperature control module 13, and a timing module 14.

[0075] A mold cavity 2 is provided in the cavity 1; a condensation controller 3 is fixed by screws on the left side of the top surface of the cavity 1; a water injection pipe 4 is embedded in the condensation controller 3; the water injection pipe 4 is sleeved in the cavity 1; the bottom of the water injection pipe 4 is connected to the venturi tube 5; a valve 7 is fixed by screws in the center of the top surface of the cavity 1; a material injection pipe 6 is embedded in the valve 7; the material injection pipe 6 is sleeved in the cavity 1; a drain pipe 9 is sleeved at the bottom of the right side of the cavity 1; a switch 8 is provided on the top of the drain pipe 9; a temperature detection module 10 is provided on the upper left side of the condensation controller 3; a timing module 14 is provided on the lower left side of the condensation controller 3; a water flow detection module 12 is provided on the upper right side of the condensation controller 3; a cooling temperature control module 13 is provided on the lower right side of the condensation controller 3; a central control module 11 is provided in the center of the condensation controller 3; the central control module 11 is connected to the temperature detection module 10, the water flow detection module 12, the cooling temperature control module 13, and the timing module 14 through circuit lines;

[0076] The temperature detection module 10 is connected to the central control module 11 and is used to detect the cooling water temperature data;

[0077] The central control module 11 is connected with the temperature detection module 10, the water flow detection module 12, the cooling temperature control module 13, and the timing module 14, and is used to control the normal operation of each module;

[0078] A water flow detection module 12 is connected to the central control module 11 and is used to detect the cooling water flow data in the cavity;

[0079] A cooling temperature control module 13, connected to the central control module 11, for controlling the cooling water temperature;

[0080] The timing module 14 is connected to the central control module 11 and is used to set the cooling time.

[0081] Cavity 1, mold cavity 2, condensation controller 3, water injection pipe 4, venturi tube 5, material injection pipe 6, valve 7, switch 8, drain pipe 9, temperature detection module 10, central control module 11, water flow detection module 12, cooling temperature control module 13, timing module 14.

[0082] like Figure 3 As shown, the detection method of the water flow detection module 12 provided by the present invention is as follows:

[0083] S101, a venturi tube is arranged in the mold cavity, and the throat of the venturi tube or the vicinity of the throat of the venturi tube is selected as a water pressure detection point A, and a point away from the venturi tube is selected as a water pressure reference point B;

[0084] S102, calculating the water flow rate Q in the cavity after the water pump in the cavity is turned on and the water pressure is stable according to the Bernoulli principle;

[0085]

[0086]

[0087] k is a structural parameter;

[0088] Among them, D a Indicates the inner diameter of the Venturi tube at the water pressure detection point A, D b Indicates the inner diameter of the cavity at the water pressure reference point B; P b1 It indicates the water pressure value at the water pressure reference point B after the water pump in the cavity is turned on and the water pressure is stable; P a1 It indicates the dynamic water pressure value at the water pressure detection point A after the water pump in the cavity is turned on and the water pressure is stable; P a1 <P b1 ;

[0089] When the water flow in the cavity is in a static state, the first static water pressure at the water pressure detection point A is P a0 , the second hydrostatic pressure at the water pressure reference point B is P b0 , where P a0 =P b0 ;

[0090] P b1 =(1+α)P b0 =(1+α)P a0 Formula (3);

[0091] Among them, α represents P b1 With P b0 The relative error between

[0092] but

[0093] Get the first hydrostatic pressure P when the water flow in the cavity at the water pressure detection point A is in a static state a0 And the dynamic water pressure value P after the water pump in the cavity is turned on and the water pressure is stable a1 , and then the water flow Q in the cavity is calculated according to formula (4) after the water pump in the cavity is turned on and the water pressure is stable.

[0094] The method provided by the present invention for determining the inner hole diameter at or near the throat of the Venturi tube is:

[0095] Calculate Pa1 With P a0 The relative difference β(Q);

[0096] P a1 =(1-β(Q))P a0 (5)

[0097] but

[0098] According to formula (4) and formula (5), we can get:

[0099]

[0100] but

[0101] To ensure where β min P is within the normal water flow range Q a1 With P a0 The minimum relative difference of

[0102] but

[0103] Calculate the required Da according to formula (2) and formula (9).

[0104] After the water pump in the cavity provided by the present invention is turned on and the water pressure is stable, the method for determining the calculation error of the water flow rate Q in the cavity is:

[0105] According to formula (7), we can get:

[0106]

[0107] According to formula (10), after the water pump in the cavity is turned on and the water pressure is stable, the calculation error of the water flow Q in the cavity is

[0108] Since β(Q) ≥ β min ,but

[0109] According to β min The requirements are used to determine the calculation error range of the water flow rate Q in the cavity after the water pump in the cavity is turned on and the water pressure is stable.

[0110] like Figure 4 As shown, the control method of the cooling temperature control module 13 provided by the present invention is as follows:

[0111] S201, configure the working parameters of the cooling water inverter; obtain the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, and the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter;

[0112] S202, determining the water temperature change time of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter according to the temperature difference and the water temperature change coefficient; generating a control signal according to the water temperature change time; controlling the fan speed according to the control signal to control the temperature of the high-temperature cavity cooling water and the low-temperature cavity cooling water;

[0113] S203, when the temperature difference is greater than a first preset value, the water temperature variation coefficients of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature rise rate coefficients, and the water temperature variation times of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature rise rate times;

[0114] S204, when the temperature difference is less than or equal to the first preset value and greater than the second preset value, the water temperature variation coefficients of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature drop coefficients, and the water temperature variation times of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature drop times;

[0115] S205 , controlling the output voltages of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter according to the control signal to control the fan speed.

[0116] The method for obtaining the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter provided by the present invention includes:

[0117] Obtaining the corresponding relationship between the current temperature of the high-temperature cavity cooling water and the water temperature variation coefficient;

[0118] The water temperature variation coefficient is determined according to the corresponding relationship and the current temperature of the high-temperature cavity cooling water.

[0119] The high-temperature cavity cooling water inverter provided by the present invention comprises: a first speed-up port and a first speed-down port.

[0120] The low-temperature cavity cooling water inverter provided by the present invention comprises: a second speed-up port and a second speed-down port.

[0121] The control method provided by the present invention also includes:

[0122] When the temperature difference is greater than the first preset value, and the water temperature rise time is less than the first preset time, the first speed-up port and the second speed-up port are controlled to be in an open state, and the first speed-down port and the second speed-down port are controlled to be in a closed state;

[0123] When the temperature difference is less than or equal to the first preset value, greater than the second preset value, and the water temperature drop time is less than the second preset time, the first drop port and the second drop port are controlled to be in an open state, and the first increase port and the second increase port are controlled to be in a closed state;

[0124] When the first speed-up port and the second speed-up port are opened, and the first speed-down port and the second speed-down port are closed, the output voltages of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter increase;

[0125] When the first speed reduction port and the second speed reduction port are opened, and the first speed increase port and the second speed increase port are closed, the output voltage of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter is the same as before receiving the control signal, and the output voltage of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter remains unchanged.

[0126] The method provided by the present invention further includes: obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, and the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter.

[0127] Determine whether the current temperature of the high-temperature cavity cooling water is greater than a first maximum setting value, or whether the current temperature of the low-temperature cavity cooling water is greater than a second maximum setting value;

[0128] Correspondingly, the method of obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, as well as the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter, includes: if the current temperature of the high-temperature cavity cooling water is greater than the first maximum setting value, or the current temperature of the low-temperature cavity cooling water is greater than the second maximum setting value, then obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, as well as the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter.

[0129] 2. Application Examples: In order to prove the creativity and technical value of the technical solution of the present invention, this section provides application examples of the technical solution of the claims on specific products or related technologies.

[0130] When the present invention is working, first, the mold raw material is injected into the mold cavity 2 through the injection pipe 6; then, cooling water is injected into the mold cavity 1 through the water injection pipe 4; the cooling water is refrigerated and controlled by the condensation controller 3; then, the condensation controller 3 detects the cooling water temperature data through the temperature detection module 10; the central control module 11 detects the cooling water flow data in the mold cavity through the water flow detection module 12; the cooling water temperature is controlled by the cooling temperature control module 13; the cooling time is set by the timing module 14; finally, after cooling is completed, the mold is taken out; and the drain pipe 9 switch 8 is opened to discharge the cooling water.

[0131] It should be noted that the embodiments of the present invention can be implemented by hardware, software, or a combination of software and hardware. The hardware part can be implemented using dedicated logic; the software part can be stored in a memory and executed by an appropriate instruction execution system, such as a microprocessor or dedicated design hardware. It can be understood by a person of ordinary skill in the art that the above-mentioned devices and methods can be implemented using computer executable instructions and / or contained in a processor control code, such as a carrier medium such as a disk, CD or DVD-ROM, a programmable memory such as a read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. Such code is provided on the carrier medium. The device and its modules of the present invention can be implemented by hardware circuits such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., can also be implemented by software executed by various types of processors, and can also be implemented by a combination of the above-mentioned hardware circuits and software, such as firmware.

[0132] 3. Evidence of the effects of the embodiments. The embodiments of the present invention have achieved some positive effects during the development or use process, and indeed have great advantages over the prior art. The following content is described in conjunction with the data, charts, etc. of the test process.

[0133] The present invention can improve the accuracy of cooling water flow detection in a large cavity through a water flow detection module; at the same time, the cooling temperature control module determines the temperature difference and the water temperature variation coefficient according to the temperature of the high-temperature cavity cooling water and the temperature setting value of the high-temperature cavity cooling water according to the control signal, and the control signal controls the output voltage of the high-temperature cavity cooling water inverter and the output voltage of the low-temperature cavity cooling water inverter to realize the speed control of the fan motor, and maintain the temperature of the high-temperature cavity cooling water and the temperature of the low-temperature cavity cooling water at a given value; it can avoid the problem of large changes and oscillations in the cavity cooling water temperature caused by overshoot due to the use of PID control and then inaccurate control.

[0134] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A micro-foam deep cavity injection mold cavity core cooling device, characterized in that: The micro-foam deep cavity injection mold cavity core cooling device is provided with a cavity; A mold cavity is provided in the cavity; a condensation controller is fixed by screws on the left side of the top surface of the cavity; a water injection pipe is embedded in the condensation controller; the water injection pipe is sleeved in the cavity; the bottom of the water injection pipe is connected to the venturi tube; a valve is fixed by screws in the center of the top surface of the cavity; a material injection pipe is embedded in the valve; the material injection pipe is sleeved in the cavity; a drain pipe is sleeved at the bottom right of the cavity; a switch is provided on the top of the drain pipe; a temperature detection module is provided on the upper left side of the condensation controller; a timing module is provided on the lower left side of the condensation controller; a water flow detection module is provided on the upper right side of the condensation controller; a cooling temperature control module is provided on the lower right side of the condensation controller; a central control module is provided in the center of the condensation controller; the central control module is respectively connected to the temperature detection module, the water flow detection module, the cooling temperature control module, and the timing module through circuit lines; The temperature detection module is connected to the central control module and is used to detect the cooling water temperature data; The central control module is connected with the temperature detection module, the water flow detection module, the cooling temperature control module and the timing module to control the normal operation of each module; A water flow detection module is connected to the central control module and is used to detect the cooling water flow data in the cavity; A cooling temperature control module is connected to the central control module and is used to control the cooling water temperature; A timing module, connected to the central control module, is used to set the cooling time; The water flow detection module detection method is as follows: (1) A venturi tube is arranged in the mold cavity, and the throat of the venturi tube or the vicinity of the throat of the venturi tube is selected as the water pressure detection point A, and the point far from the venturi tube is selected as the water pressure reference point B; (2) Calculate the water flow rate Q in the cavity after the water pump in the cavity is turned on and the water pressure is stable according to the Bernoulli principle; k is a structural parameter; Among them, D a Indicates the inner diameter of the Venturi tube at the water pressure detection point A, D b Indicates the inner diameter of the cavity at the water pressure reference point B; P b1 It indicates the water pressure value at the water pressure reference point B after the water pump in the cavity is turned on and the water pressure is stable; P a1 It indicates the dynamic water pressure value at the water pressure detection point A after the water pump in the cavity is turned on and the water pressure is stable; P a1 <P b1 ; When the water flow in the cavity is in a static state, the first static water pressure at the water pressure detection point A is P a0 , the second hydrostatic pressure at the water pressure reference point B is P b0 , where P a0 =P b0 ; P b1 =(1 + α)P b0 =(1 + α)P a0 Formula (3); Among them, α represents P b1 With P b0 The relative error between but Get the first hydrostatic pressure P when the water flow in the cavity at the water pressure detection point A is in a static state a0 And the dynamic water pressure value P after the water pump in the cavity is turned on and the water pressure is stable a1 , and then the water flow Q in the cavity is calculated according to formula (4) after the water pump in the cavity is turned on and the water pressure is stable.

2. The micro-foam deep cavity injection mold cavity core cooling device as claimed in claim 1, characterized in that: The method for determining the inner diameter of the venturi tube at or near the venturi tube throat is: Calculate P a1 With P a0 The relative difference β(Q); P a1 =(1-β(Q))P a0 (5) but According to formula (4) and formula (5), we can get: but To ensure where β min P is within the normal water flow range Q a1 With P a0 The minimum relative difference of but Calculate the required Da according to formula (2) and formula (9).

3. The micro-foam deep cavity injection mold cavity core cooling device as claimed in claim 1, characterized in that: After the water pump in the cavity is turned on and the water pressure is stable, the calculation error of the water flow Q in the cavity is determined by: According to formula (7), we can get: According to formula (10), after the water pump in the cavity is turned on and the water pressure is stable, the calculation error of the water flow Q in the cavity is Since β(Q) ≥ β min ,but According to β min The requirements are used to determine the calculation error range of the water flow rate Q in the cavity after the water pump in the cavity is turned on and the water pressure is stable.

4. The micro-foam deep cavity injection mold cavity core cooling device as claimed in claim 1, characterized in that: The cooling temperature control module control method is as follows: 1) configuring the working parameters of the cooling water inverter; obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, and the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter; 2) determining the water temperature change time of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter according to the temperature difference and the water temperature change coefficient; generating a control signal according to the water temperature change time; Controlling the fan speed according to the control signal to control the temperature of the high-temperature cavity cooling water and the low-temperature cavity cooling water; 3) When the temperature difference is greater than a first preset value, the water temperature variation coefficients of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature rise rate coefficients, and the water temperature variation times of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature rise rate times; 4) When the temperature difference is less than or equal to the first preset value and greater than the second preset value, the water temperature variation coefficients of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature drop coefficients, and the water temperature variation times of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter are both water temperature drop times; 5) controlling the output voltages of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter according to the control signal to control the fan speed.

5. The micro-foam deep cavity injection mold cavity core cooling device as claimed in claim 4, characterized in that: Obtain the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter, including: Obtaining the corresponding relationship between the current temperature of the high-temperature cavity cooling water and the water temperature variation coefficient; The water temperature variation coefficient is determined according to the corresponding relationship and the current temperature of the high-temperature cavity cooling water.

6. The micro-foam deep cavity injection mold cavity core cooling device as claimed in claim 4, characterized in that: The high-temperature cavity cooling water inverter includes a first speed-up port and a first speed-down port.

7. The micro-foam deep cavity injection mold cavity core cooling device as claimed in claim 4, characterized in that: The low-temperature cavity cooling water inverter includes: a second speed-up port and a second speed-down port.

8. The micro-foam deep cavity injection mold cavity core cooling device as claimed in claim 4, characterized in that: The control method further comprises: When the temperature difference is greater than the first preset value, and the water temperature rise time is less than the first preset time, the first speed-up port and the second speed-up port are controlled to be in an open state, and the first speed-down port and the second speed-down port are controlled to be in a closed state; When the temperature difference is less than or equal to the first preset value, greater than the second preset value, and the water temperature drop time is less than the second preset time, the first drop port and the second drop port are controlled to be in an open state, and the first increase port and the second increase port are controlled to be in a closed state; When the first speed-up port and the second speed-up port are opened, and the first speed-down port and the second speed-down port are closed, the output voltages of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter increase; When the first speed reduction port and the second speed reduction port are opened, and the first speed increase port and the second speed increase port are closed, the output voltage of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter is the same as before receiving the control signal, and the output voltage of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter remains unchanged.

9. The micro-foam deep cavity injection mold cavity core cooling device as claimed in claim 4, characterized in that: Before obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, and the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter, the method further includes: Determine whether the current temperature of the high-temperature cavity cooling water is greater than a first maximum setting value, or whether the current temperature of the low-temperature cavity cooling water is greater than a second maximum setting value; Correspondingly, the method of obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, as well as the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter, includes: if the current temperature of the high-temperature cavity cooling water is greater than the first maximum setting value, or the current temperature of the low-temperature cavity cooling water is greater than the second maximum setting value, then obtaining the temperature difference between the current temperature of the high-temperature cavity cooling water and the preset temperature of the high-temperature cavity cooling water, as well as the water temperature variation coefficient of the high-temperature cavity cooling water inverter and the low-temperature cavity cooling water inverter.

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