Control system for an injection mold, injection mold and injection method

Abstract

The present application relates to a control system for injection mold, injection mold and injection method, the control system comprises: a first electromagnetic valve with an air inlet P1, a working port A1, a working port B1, wherein the air inlet P1 is communicated with an external compressed air source; a second electromagnetic valve with an air inlet P2, a working port A2, a working port B2, wherein the air inlet P2 is communicated with the working port A1 of the first electromagnetic valve; a pneumatic three-way ball valve assembly with a first gas port Q1, a second gas port Q2, a third gas port Q3, wherein the third gas port Q3 is communicated with the gas inlet and outlet channel of the first mold of the injection mold, which is communicated with the mold cavity of the injection mold; a vacuum generator, the air inlet P4 of which is communicated with the working port B1 of the first electromagnetic valve, and the vacuum port V4 is communicated with the first gas port Q1 of the pneumatic three-way ball valve assembly; a cooler, the air inlet P5 of which is communicated with the working port B2 of the second electromagnetic valve, and the cold end outlet C5 is communicated with the second gas port Q2 of the pneumatic three-way ball valve assembly.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to a control system, injection mold, and injection method for injection molds. Background Technology

[0002] Currently, the industry mostly uses PP (polypropylene) and POM (polyoxymethylene) materials for injection molding. However, PP and POM materials cannot meet the requirement of stable operation within a temperature range of -40°C to 120°C. Tests have shown that polyphenylene sulfide containing 40% (by weight) glass fiber can meet the requirement of stable operation between -40°C and 120°C; however, some problems still exist in practical applications.

[0003] During the injection molding process of polyphenylene sulfide containing 40% glass fiber, when the molten plastic fills the mold cavity, it may push the air originally present in the mold cavity and the gas generated by the decomposition of the plastic (materials with poor thermal stability are prone to decomposition and gas generation when they stay in the barrel for too long or at too high a temperature) to the end of the molten material flow, thus causing problems such as trapped air and scorching. Furthermore, as the time for the molten material to fill the mold cavity increases, the temperature of the molten material decreases, the flow rate slows down, and the end filling becomes more difficult.

[0004] In addition, polyphenylene sulfide materials containing 40% glass fiber have very good strength and are particularly suitable for producing some thin-walled and deep-cavity parts (such as the shielding sleeve of the brushless electric water pump component). This results in a large length-to-diameter ratio of the mold parts, making them unsuitable for cooling water channels. Furthermore, the mold dissipates heat relatively slowly in the air, causing difficulties in demolding and product burns. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by providing a control system for injection molds, which solves the problems of air entrapment and difficulty in filling at the end of the molten material flow, as well as poor cooling effect for parts with large length-to-diameter ratios.

[0006] The present invention also provides an injection mold for an injection molding machine that includes the aforementioned control system.

[0007] The present invention also provides an injection molding method.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0009] A control system for injection molds, comprising:

[0010] The first solenoid valve has an inlet P1, a working port A1, and a working port B1, wherein the inlet P1 is connected to an external compressed air source; the first solenoid valve has a first state and a second state, in the first state the inlet P1 and the working port B1 are connected, and in the second state the inlet P1 and the working port A1 are connected.

[0011] The second solenoid valve has an air inlet P2, a working port A2, and a working port B2, wherein the air inlet P2 is connected to the working port A1 of the first solenoid valve; the second solenoid valve has a first state in which the air inlet P2 and the working port B2 are connected.

[0012] A pneumatic three-way ball valve assembly has a first air port Q1, a second air port Q2, and a third air port Q3, wherein the third air port Q3 is connected to the air inlet / outlet channel of the first mold of the injection mold, and the air inlet / outlet channel is connected to the gas in the mold cavity of the injection mold; the pneumatic three-way ball valve assembly has a first state and a second state, wherein in the first state, the first air port Q1 and the third air port Q3 are connected, and in the second state, the second air port Q2 and the third air port Q3 are connected;

[0013] The vacuum generator has its air inlet P4 connected to the working port B1 of the first solenoid valve, and its vacuum port V4 connected to the first air port Q1 of the pneumatic three-way ball valve assembly.

[0014] The cooler has its air inlet P5 connected to the working port B2 of the second solenoid valve, and its cold end outlet C5 connected to the second air port Q2 of the pneumatic three-way ball valve assembly.

[0015] When both the first solenoid valve and the pneumatic three-way ball valve assembly are in their respective first states, the air inlet and outlet channels of the first mold of the injection mold are under negative pressure under the action of the vacuum generator; when both the first solenoid valve and the pneumatic three-way ball valve assembly are in their respective second states, and the second solenoid valve is in its first state, the cooler delivers cooled gas to the air inlet and outlet channels of the first mold of the injection mold.

[0016] Preferably, the working port A2 of the second solenoid valve is connected to the air inlet channel of the second mold of the injection mold; the second solenoid valve has a second state in which the air inlet P2 and the working port A2 are connected to deliver compressed gas to the air inlet channel of the second mold of the injection mold.

[0017] Preferably, the pneumatic three-way ball valve assembly includes:

[0018] A pneumatic three-way ball valve has a pneumatic actuator and a valve body; the first air port Q1, the second air port Q2 and the third air port Q3 are located on the valve body;

[0019] The third solenoid valve has an air inlet P3, a working port A3, and a working port B3. The air inlet P3 is connected to an external compressed air source, and the working ports A3 and B3 are respectively connected to the two air inlets of the cylinder of the pneumatic actuator to realize the switching of the pneumatic three-way ball valve assembly between the first state and the second state.

[0020] Preferably, the coils of the first solenoid valve, the third solenoid valve, and the first power supply are connected in series to form a first circuit, and a first drive switch for controlling the on / off state of the first circuit is also connected in series on the first circuit. After receiving the injection signal from the injection molding machine, the signal input terminal of the first drive switch controls the first circuit to be turned on, so that the first solenoid valve and the pneumatic three-way ball valve assembly are both in their respective first states.

[0021] Preferably, the second solenoid valve has a second coil, which is connected in series with a second power supply to form a second circuit. A second drive switch that controls the on / off state of the circuit is also connected in series in the second circuit. After receiving the ejection signal from the injection molding machine, the signal input terminal of the second drive switch controls the second circuit to be turned on, so that the second solenoid valve is in the second state.

[0022] Preferably, the second solenoid valve has a first coil, which is connected in series with a third power supply to form a third circuit. A third drive switch for controlling the on / off state of the circuit is also connected in series on the third circuit. After receiving a cooling signal from the injection molding machine, the signal input terminal of the third drive switch controls the third circuit to be turned on, so that the second solenoid valve is in the first state.

[0023] An injection mold for an injection molding machine, comprising:

[0024] The first mold has a first mold body and a core mounted on the first mold body;

[0025] The second mold has a main body and a cavity located on the main body of the second mold;

[0026] The aforementioned control system;

[0027] When the first mold and the second mold are closed, the core and the cavity cooperate to form an injection molding cavity; and the first mold also has an air inlet and outlet channel to connect the third air port Q3 with the gas in the mold cavity.

[0028] Preferably, the air inlet and outlet channels include a first channel formed on the first mold body and a second channel formed on the core; the core is a detachable ventilated insert installed on the first mold body.

[0029] Preferably, the second mold is further provided with an air intake channel communicating with the working port A2 of the second solenoid valve, and an air top valve located at the end of the air intake channel, the output end of which is located at the bottom of the cavity.

[0030] An injection molding method, comprising:

[0031] In response to the injection signal of the injection molding machine, the first solenoid valve and the pneumatic three-way ball valve assembly both enter their respective first states. The compressed gas enters the air inlet P1 and working port B1 of the first solenoid valve in sequence and then enters the air inlet P4 of the vacuum generator. The vacuum generator generates suction at its vacuum port V4, which creates a negative pressure in the mold cavity and accelerates the flow of the molten injection material.

[0032] In response to the cooling signal of the injection molding machine, the first solenoid valve and the pneumatic three-way ball valve assembly both enter their respective second states, and the second solenoid valve enters the first state. The compressed gas passes through the inlet P1 and working port A1 of the first solenoid valve in sequence, then through the inlet P2 and working port B2 of the second solenoid valve in sequence, and then enters the inlet P5 of the cooler. The cooler generates cooling gas at its cold end outlet C5 and delivers it into the mold cavity to cool the injection molded part.

[0033] Preferably, the injection molding method further includes:

[0034] In response to the ejection signal of the injection molding machine, the first solenoid valve and the pneumatic three-way ball valve assembly both enter their respective second states, and the second solenoid valve also enters its second state. This allows compressed gas to be delivered sequentially through the air inlet P1 and working port A1 of the first solenoid valve, and then sequentially through the air inlet P2 and working port A2 of the second solenoid valve to the air inlet channel of the second mold of the injection mold, thereby separating the injection-molded part from the cavity.

[0035] An injection molding method, comprising:

[0036] After starting the injection molding machine, the first mold and the second mold are closed, so that the core and the cavity fit together to form the injection molding cavity;

[0037] Molten injection material is injected into the mold cavity, and the first solenoid valve and the pneumatic three-way ball valve assembly are controlled to enter their respective first states, so that the compressed gas enters the vacuum generator's inlet P4 after passing through the inlet P1 and working port B1 of the first solenoid valve in sequence; the vacuum generator generates suction at its vacuum port V4, so that a negative pressure is formed in the mold cavity, which accelerates the flow of molten injection material.

[0038] The first solenoid valve and the pneumatic three-way ball valve assembly are both put into their respective second states, and the second solenoid valve is put into its first state. This causes the compressed gas to pass through the inlet P1 and working port A1 of the first solenoid valve in sequence, then through the inlet P2 and working port B2 of the second solenoid valve in sequence, and then into the inlet P5 of the cooler. The cooler generates cooling gas at its cold end outlet C5, and delivers it into the mold cavity in sequence through the second air port Q2, the third air port Q3, and the inlet and outlet air passages to cool the injection molded part.

[0039] Opening the mold allows the core to exit the cavity;

[0040] The first solenoid valve and the pneumatic three-way ball valve assembly are both put into their respective second states, and the second solenoid valve is put into its second state, so that the compressed gas passes through the air inlet P1 and working port A1 of the first solenoid valve in sequence, and then through the air inlet P2 and working port A2 of the second solenoid valve in sequence, and then enters the air intake channel to separate the injection molded part from the cavity.

[0041] The beneficial effects of this invention are as follows:

[0042] 1. Using the control system of this invention, when injecting molten material (molten injection molding material) into the mold cavity, the first solenoid valve and the pneumatic three-way ball valve assembly are both controlled to be in their respective first states (the air inlet P1 and working port B1 of the first solenoid valve are connected, and the first air port Q1 and the third air port Q3 of the pneumatic three-way ball valve assembly are connected). The air inlet and outlet channels of the first mold of the injection mold are in a negative pressure state under the action of the vacuum generator. In this way, during the process of injecting molten material into the mold cavity, a negative pressure can be formed in the mold cavity, accelerating the flow of molten material and avoiding air entrapment at the end of the molten material flow as much as possible, so that the molten material can fill the end of the molten material flow. Furthermore, when it is necessary to cool the injection molded part, the first solenoid valve and the pneumatic three-way ball valve assembly are controlled to be in their respective first states. All ball valve assemblies are in their respective second states (the air inlet P1 and working port A1 of the first solenoid valve are connected, and the second air port Q2 and third air port Q3 of the pneumatic three-way ball valve assembly are connected), and the second solenoid valve is in its first state (the air inlet P2 and working port B2 of the second solenoid valve are connected). The cooler delivers (blows in) cooled gas (low-temperature gas for cooling) to the air inlet and outlet channels of the first mold of the injection mold. Thus, when it is necessary to cool the injection molded part, the condenser generates low-temperature cooling gas, which is delivered to the mold cavity to achieve rapid cooling. This is especially suitable for some thin-walled and deep-cavity parts (such as the shielding sleeve of the brushless electronic water pump assembly, which has a large length-to-diameter ratio and is not suitable for water cooling). In addition, the air path is adjusted by switching the solenoid valves to control the operation of the vacuum generator and the cooler respectively. Using the same air inlet and outlet channels, air is drawn from the mold cavity to create a negative pressure in the mold cavity and cooling gas is blown into the mold cavity to cool the injection molded part.

[0043] 2. The third air port Q3 is connected to the gas in the mold cavity through the air inlet and outlet channels. Cooled gas is delivered to the air inlet and outlet channels of the first mold of the injection mold. This can cool the injection molded part and blow off the adhering substances on the core surface to ensure the cleanliness of the core surface in the next injection.

[0044] 3. Using the control system of the present invention, when it is necessary to eject the injection molded part, the second solenoid valve is controlled to be in the second state (the air inlet P2 and the working port A2 are connected); in this way, compressed gas can be delivered to the air inlet channel of the second mold of the injection mold to separate the injection molded part from the cavity.

[0045] 4. The coils of the first solenoid valve and the third solenoid valve, along with the first power supply, are connected in series to form a first circuit. A first drive switch that controls the on / off state of the circuit is also connected in series in the first circuit. After receiving the injection signal from the injection molding machine, the signal input terminal of the first drive switch controls the first circuit to be turned on, so that the first solenoid valve and the pneumatic three-way ball valve assembly are both in their respective first states. In this way, the injection signal from the injection molding machine is used to control the operation of the first and third solenoid valves, which simultaneously enter their respective first states. During the process of injecting molten material into the mold cavity, a negative pressure can be formed in the mold cavity, which accelerates the flow of molten material and removes the gas trapped at the end. That is, the linkage control based on the injection signal of the injection molding machine has good real-time performance and does not require an additional control mechanism.

[0046] 5. The second solenoid valve has a second coil, which is connected in series with the second power supply to form a second circuit. A second drive switch that controls the on / off state of the second circuit is also connected in series in the second circuit. After receiving the ejection signal from the injection molding machine, the signal input terminal of the second drive switch controls the second circuit to be turned on, so that the second solenoid valve is in the second state. In this way, the ejection signal of the injection molding machine is used to control the second solenoid valve to work and enter its second state, so as to deliver compressed gas to the air inlet channel of the second mold of the injection mold, and separate the injection molded part from the cavity. That is, the linkage control based on the ejection signal of the injection molding machine has good real-time performance and does not require an additional control mechanism.

[0047] 6. The second solenoid valve has a first coil, which is connected in series with a third power supply to form a third circuit. A third drive switch that controls the on / off state of the third circuit is also connected in series on the third circuit. After receiving the cooling signal from the injection molding machine, the signal input terminal of the third drive switch controls the third circuit to be turned on, so that the second solenoid valve is in the first state. In this way, the cooling signal of the injection molding machine is used to control the second solenoid valve to work and enter its first state, so that the condenser generates low-temperature cooling gas, which is delivered to the mold cavity to achieve rapid cooling. That is, the linkage control based on the cooling signal of the injection molding machine has good real-time performance and does not require an additional control mechanism. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the control system of the present invention. Figure 1 .

[0049] Figure 2 This is a schematic diagram of the control system of the present invention. Figure 2 .

[0050] Figure 3 This is a cross-sectional view of the injection mold of the present invention in the mold-closed state.

[0051] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0052] Figure 5 This is a perspective view of the first mold of the present invention.

[0053] Figure 6 This is a three-dimensional sectional view of the first model of the present invention.

[0054] Figure 7 This is a cross-sectional view of the first mold of the present invention.

[0055] Figure 8 for Figure 7 A magnified view of a portion of the image.

[0056] Figure 9 This is a perspective view of the core of the present invention.

[0057] Figure 10 This is a three-dimensional sectional view of the core of the present invention.

[0058] Figure 11 This is a perspective view of the second model of the present invention.

[0059] Figure 12 This is a cross-sectional view of the second module of the present invention.

[0060] Figure 13 This is a three-dimensional sectional view of the air-lift valve of the present invention (piston rod in the first position).

[0061] Figure 14 This is a cross-sectional view of the air-lift valve of the present invention (piston rod in the first position).

[0062] Figure 15 This is a cross-sectional view of the air-lift valve of the present invention (piston rod in the second position).

[0063] The markings in the image are as follows:

[0064] First solenoid valve 100; First lead-out 101; Second lead-out 102;

[0065] Second solenoid valve 200; Third lead 201; Fourth lead 202; Fifth lead 203; Sixth lead 204;

[0066] Pneumatic three-way ball valve assembly 300; pneumatic three-way ball valve 301; pneumatic actuator 3011; valve body 3012; third solenoid valve 302; seventh lead-out 3021; ​​eighth lead-out 3022;

[0067] Vacuum generator 400;

[0068] Cooler 500;

[0069] First mold 600; First mold body 601; Core 602; Beryllium copper insert body 6021; Exhaust steel 6022; Inlet and outlet air passages 603; First passage 6031; Second passage 6032;

[0070] Second mold 700; Second mold body 701; Cavity 702; Air inlet channel 703; Air valve 704; Cylinder 7041; First step 70411; Second step 70412; Third step 70413; Piston rod 7042; Limiting part 70421; Bolt 7043; Washer 7044; Spring 7045;

[0071] Mold cavity 800. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are exemplary embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0073] "Trapped air" generally refers to the phenomenon where, during the process of molten material filling the mold cavity, gas in the cavity cannot be expelled in a timely manner or even at all, thus preventing the molten material from continuing to fill and leading to injection molding defects such as material shortage and scorching. The gas in the mold cavity mainly comes from two sources: one is the gas originally present in the mold cavity (such as air), and the other is water vapor formed from the vaporization of moisture carried by the molten material itself, as well as gases produced by the thermal decomposition of the molten material. To solve the problem of trapped air, venting channels can be added at the end of the molten material flow. However, over time, the venting channels will become smaller (gradually filled by the molten material), and the venting effect will become worse, requiring regular cleaning of the venting channels, which significantly affects production efficiency and does not promote an increase in the molten material flow rate.

[0074] "Cooling" generally refers to transferring the heat contained in the molten material, transforming it from a viscous flow state to a glassy or crystalline state, thus achieving sufficient rigidity and dimensional stability for ejection. The cooling process typically accounts for 80% of the entire injection molding cycle and is a critical step determining product quality and production efficiency. When producing some thin-walled and deep-cavity parts (such as the shielding sleeve of a brushless electric water pump), the mold parts have a large length-to-diameter ratio, making them unsuitable for cooling water channels. Furthermore, the mold dissipates heat slowly in the air, leading to difficulties in demolding and product burns.

[0075] This embodiment provides a control system for an injection mold, including: a first solenoid valve having an air inlet P1, a working port A1, and a working port B1, wherein the air inlet P1 is connected to an external compressed air source; the first solenoid valve has a first state and a second state, wherein in the first state, the air inlet P1 and the working port B1 are connected, and in the second state, the air inlet P1 and the working port A1 are connected; a second solenoid valve having an air inlet P2, a working port A2, and a working port B2, wherein the air inlet P2 is connected to the working port A1 of the first solenoid valve; the second solenoid valve has a first state, wherein in the first state, the air inlet P2 and the working port B2 are connected; a pneumatic three-way ball valve assembly having a first air port Q1, a second air port Q2, and a third air port Q3, wherein the third air port Q3 is connected to the air inlet / outlet channel of the first mold of the injection mold, and the air inlet / outlet channel is connected to the gas in the mold cavity of the injection mold; the pneumatic three-way ball valve The component has a first state and a second state. In the first state, the first air port Q1 and the third air port Q3 are connected. In the second state, the second air port Q2 and the third air port Q3 are connected. The vacuum generator has its air inlet P4 connected to the working port B1 of the first solenoid valve and its vacuum port V4 connected to the first air port Q1 of the pneumatic three-way ball valve assembly. The cooler has its air inlet P5 connected to the working port B2 of the second solenoid valve and its cold end outlet C5 connected to the second air port Q2 of the pneumatic three-way ball valve assembly. When the first solenoid valve and the pneumatic three-way ball valve assembly are both in their respective first states, the air inlet and outlet channels of the first mold of the injection mold are under negative pressure under the action of the vacuum generator. When the first solenoid valve and the pneumatic three-way ball valve assembly are both in their respective second states and the second solenoid valve is in the first state, the cooler delivers cooled gas to the air inlet and outlet channels of the first mold of the injection mold. Thus, during the injection of molten material into the mold cavity, by controlling the first solenoid valve and the pneumatic three-way ball valve assembly to be in their respective first states, a negative pressure can be formed in the mold cavity, accelerating the flow of molten material. At the same time, the residual gas at the end is discharged to the outside through the negative pressure generator, ensuring that the air path at the end of the mold is unobstructed and avoiding the phenomenon of trapped gas and burning at the end of the molten material flow as much as possible, so that the molten material can fill the end of the molten material flow. When it is necessary to cool the injection molded part, by controlling the first solenoid valve and the pneumatic three-way ball valve assembly to be in their respective second states, and the second solenoid valve to be in the first state, a low-temperature cooling gas is generated by the condenser and delivered to the mold cavity to achieve rapid cooling. This is especially suitable for some thin-walled and deep-cavity parts (such as the shielding sleeve of the brushless electronic water pump assembly, which has the common characteristic of having a large length-to-diameter ratio and is not suitable for water cooling). In addition, the air path is adjusted by switching the solenoid valve, and the operation of the vacuum generator and cooler is controlled separately. Using the same air inlet and outlet channel, air is drawn from the mold cavity to create negative pressure in the mold cavity and cooling gas is blown into the mold cavity to cool the injection molded parts.

[0076] The technical solution of this embodiment will be described in detail below with reference to the accompanying drawings.

[0077] like Figures 1-2 An example of a control system for an injection mold includes a first solenoid valve 100, a second solenoid valve 200, a pneumatic three-way ball valve assembly 300, a vacuum generator 400, and a cooler 500.

[0078] like Figure 1 , Figure 2 As shown, the first solenoid valve 100 has an inlet P1, a working port A1, and a working port B1, wherein the inlet P1 is connected to an external compressed air source. The first solenoid valve 100 has a first state and a second state. In the first state, the inlet P1 and the working port B1 are connected; in the second state, the inlet P1 and the working port A1 are connected. In some practical applications, the first solenoid valve 100 is a single-electro-controlled two-position five-way solenoid valve. In other practical applications, the first solenoid valve 100 has a coil, with its two ends connected to a first lead 101 and a second lead 102, respectively. In still other practical applications, when the coil of the first solenoid valve 100 is energized, the first solenoid valve 100 enters the first state, with the inlet P1 and the working port B1 connected; when the coil of the first solenoid valve 100 is de-energized, the first solenoid valve 100 enters the second state, with the inlet P1 and the working port A1 connected.

[0079] The second solenoid valve 200 has an inlet port P2, a working port A2, and a working port B2, wherein the inlet port P2 is connected to the working port A1 of the first solenoid valve 100. The second solenoid valve 200 has a first state, in which the inlet port P2 and the working port B2 are connected. In some practical applications, the second solenoid valve 200 has a second state, in which the inlet port P2 and the working port A2 are connected. In other practical applications, the second solenoid valve 200 has a third state, in which the second solenoid valve 200 enters a closed-loop state, and the inlet port P2 is not connected to either the working port A2 or the working port B2; all air passages are isolated by the valve core and are not interconnected. In some practical applications, the second solenoid valve 200 is a closed-loop type dual-electrically controlled three-position five-way solenoid valve. The second solenoid valve 200 has a first coil and a second coil. The two ends of the first coil are respectively connected to the third lead 201 and the fourth lead 202, and the two ends of the second coil are respectively connected to the fifth lead 203 and the sixth lead 204. When the first coil is energized (at which time the second coil is de-energized), the second solenoid valve 200 enters its first state, and the air inlet P2 and the working port B2 are connected; when the second coil is energized (at which time the first coil is de-energized), the second solenoid valve 200 enters its second state, and the air inlet P2 and the working port A2 are connected; when both the first coil and the second coil are de-energized, the second solenoid valve 200 enters its third state, and all air paths are isolated by the valve core and are not connected to each other.

[0080] The pneumatic three-way ball valve assembly 300 has a first air port Q1, a second air port Q2, and a third air port Q3, wherein the third air port Q3 is connected to the air inlet / outlet channel of the first mold of the injection mold, and the air inlet / outlet channel is connected to the gas in the mold cavity of the injection mold; the pneumatic three-way ball valve assembly 300 has a first state and a second state. In the first state, the first air port Q1 and the third air port Q3 are connected, and in the second state, the second air port Q2 and the third air port Q3 are connected. In some practical applications, the pneumatic three-way ball valve assembly 300 includes a pneumatic three-way ball valve 301 and a third solenoid valve 302. The pneumatic three-way ball valve 301 has a pneumatic actuator 3011 and a valve body 3012, wherein the pneumatic actuator 3011 serves as the driving device for the valve body 3012, converting the energy of compressed air into mechanical motion to change the flow path; the first air port Q1, the second air port Q2, and the third air port Q3 are located on the valve body 3012. The third solenoid valve 302 has an inlet P3, a working port A3, and a working port B3. Inlet P3 is connected to an external compressed air source (which can share the same external compressed air source as inlet P1, or inlet P1 and inlet P3 can be connected to two different external compressed air sources). Working ports A3 and B3 are respectively connected to the two air inlets of the cylinder of the pneumatic actuator 3011, thereby enabling the pneumatic three-way ball valve assembly 300 to switch between a first state and a second state. In some other practical applications, the third solenoid valve 302 is a single-electro-controlled two-position five-way solenoid valve. In still other practical applications, the third solenoid valve 302 has a coil, with its two ends connected to a seventh lead 3021 and an eighth lead 3022, respectively. When the coil of the third solenoid valve 302 is energized, the air inlet P2 and the working port B2 are connected, which connects the first air port Q1 and the third air port Q3 (at this time, the second air port Q2 is closed), and the pneumatic three-way ball valve assembly 300 enters its first state; when the coil of the third solenoid valve 302 is de-energized, the air inlet P2 and the working port A2 are connected, which connects the second air port Q2 and the third air port Q3 (at this time, the first air port Q1 is closed), and the pneumatic three-way ball valve assembly 300 enters its second state.

[0081] The vacuum generator 400 has an inlet P4, a vacuum port V4, and an outlet R4. The inlet P4 is connected to the working port B1 of the first solenoid valve 100, used to input compressed gas into the vacuum generator 400. The vacuum port V4 is connected to the first port Q1 of the pneumatic three-way ball valve assembly 300, using the vacuum generator 400 to create a negative pressure at the first port Q1. The outlet R4 is generally (directly or indirectly) connected to the external atmosphere to discharge waste gas. The structure of the vacuum generator is existing technology, and its design is based on the Venturi effect: when a high-pressure fluid (such as compressed air, entering through the inlet P4) passes through a narrowed channel (throat), its flow velocity increases, causing a sharp drop in static pressure at that point, forming a local vacuum (negative pressure). This negative pressure area is used for "inhaling" or "evacuating" (corresponding to the location of the vacuum port V4). It should be noted that the vacuum here is not an absolute vacuum, but rather refers to a state where the pressure is lower than atmospheric pressure.

[0082] The cooler 500 is a vortex tube cooler, which has an air inlet P5, a cold end outlet C5, and a hot end outlet H5. The air inlet P5 is connected to the working port B2 of the second solenoid valve 200 for inputting compressed gas into the cooler 500. The cold end outlet C5 is connected to the second air port Q2 of the pneumatic three-way ball valve assembly 300, and the cooler 500 blows cooled low-temperature gas into the second air port Q2 of the pneumatic three-way ball valve assembly 300. The hot end outlet H5 is generally (directly or indirectly) connected to the outside atmosphere to discharge exhaust gas.

[0083] When both the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 are in their respective first states, the air inlet and outlet channels of the first mold of the injection mold are under negative pressure under the action of the vacuum generator 400. When both the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 are in their respective second states, and the second solenoid valve 200 is in its first state, the cooler 500 supplies cooled gas to the air inlet and outlet channels of the first mold of the injection mold. Thus, during the process of injecting molten material into the mold cavity, by controlling both the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 to be in their respective first states, a negative pressure can be formed in the mold cavity (the air inlet and outlet channels are connected to the gas in the mold cavity, and when the air inlet and outlet channels are under negative pressure, the mold cavity is also under negative pressure), accelerating the flow of molten material and minimizing air entrapment at the end of the molten material flow, allowing the molten material to fill the end of the molten material flow. When cooling of the injection-molded part is required, by controlling the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 to be in their respective second states, and the second solenoid valve 200 to be in the first state, the condenser 500 generates low-temperature cooling gas, which is delivered into the mold cavity (the low-temperature cooling gas generated by the condenser can enter the mold cavity through the second air port Q2, the third air port Q3, and the inlet and outlet air channels) to achieve rapid cooling. This is especially suitable for some thin-walled and deep-cavity parts (such as the shielding sleeve of a brushless electronic water pump, which has a large length-to-diameter ratio and is not suitable for water cooling). In addition, by switching the solenoid valves to adjust the air path, the vacuum generator 400 and the cooler 500 are controlled to work separately. Using the same inlet and outlet air channels, air is drawn from the mold cavity to create a negative pressure in the mold cavity, and cooling gas is blown into the mold cavity to cool the injection-molded part.

[0084] Furthermore, PPS (polyphenylene sulfide) is a high-performance engineering plastic. If the mold temperature or barrel temperature is too high, it may undergo thermal or chemical decomposition. During the decomposition process, low-molecular-weight volatile gases and solid residues, also known as precipitates, are produced. These precipitates typically have strong adhesive properties and easily adhere to the pores on the core surface (the pores are under negative pressure, making them more prone to precipitate adhesion compared to other areas), or even block the pores on the core surface (used to allow gas communication between the air inlet / outlet channels and the mold cavity, but preventing the passage of molten material). In this embodiment, during the cooling process of the injection-molded part, the condenser 500 generates low-temperature cooling gas and delivers it into the mold cavity, which can blow off the deposits adhering to the pores on the core surface, ensuring the cleanliness of the core surface and the air permeability of the pores on the core surface as much as possible in the next injection molding.

[0085] In a preferred embodiment of this invention, the working port A2 of the second solenoid valve 200 is connected to the air inlet channel of the second mold of the injection mold; in the second state, the air inlet P2 and the working port A2 of the second solenoid valve 200 are connected to deliver compressed gas to the air inlet channel of the second mold of the injection mold (provided that the first solenoid valve is in its second state, because if the first solenoid valve is in the first state, the second solenoid valve will not have compressed gas entering and will not work), thereby separating the injection molded part from the cavity (the specific implementation will be described in detail below).

[0086] In a preferred embodiment of this invention, the coils of the first solenoid valve 100, the third solenoid valve 302, and a first power supply (not shown) are connected in series to form a first circuit, and a first drive switch (not shown) controlling the on / off state of the first circuit is also connected in series on the first circuit. For example, one end of the coil of the first solenoid valve 100 is connected to one end of the coil of the third solenoid valve 302 via the second lead 102 and the seventh lead 3021, and the other end of the coil of the first solenoid valve 100 is connected to the other end of the coil of the third solenoid valve 302 via the first lead 101, the first power supply, the first drive switch, and the eighth lead 3022, thereby forming the first circuit. After receiving the injection signal from the injection molding machine, the signal input terminal of the first drive switch controls the first circuit to be turned on, so that both the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 are in their respective first states. In this way, the injection signal of the injection molding machine is used to control the operation of the first solenoid valve 100 and the third solenoid valve 302, which enter their respective first states simultaneously. During the process of injecting molten material into the mold cavity, a negative pressure can be formed in the mold cavity to accelerate the flow of molten material. That is, the linkage control based on the injection signal of the injection molding machine has good real-time performance and does not require an additional control mechanism.

[0087] In a preferred embodiment of this invention, the second solenoid valve 200 has a second coil, which is connected in series with a second power supply (not shown) to form a second circuit. A second drive switch (not shown) is also connected in series with the second circuit to control its on / off state. For example, one end of the second coil of the second solenoid valve 200 is connected to the other end of the second coil via a third lead 201, the second power supply, the second drive switch, and a fourth lead 202, thereby forming the second circuit. When the signal input terminal of the second drive switch receives the ejection signal from the injection molding machine, it controls the second circuit to open, causing the second solenoid valve 200 to enter a second state. Thus, by using the ejection signal from the injection molding machine to control the second solenoid valve 200 to enter its second state, compressed gas is supplied to the air intake channel of the second mold of the injection mold, separating the injection-molded part from the cavity. That is, the control is based on the ejection signal of the injection molding machine, providing good real-time performance and eliminating the need for additional control mechanisms.

[0088] In a preferred embodiment of this invention, the second solenoid valve 200 has a first coil, which is connected in series with a third power supply (not shown) to form a third circuit. A third drive switch (not shown) is also connected in series with the third circuit to control its on / off state. For example, one end of the first coil of the second solenoid valve 200 is connected to the other end of the first coil via a fifth lead 203, the third power supply, the third drive switch, and a sixth lead 204, thus forming the third circuit. When the signal input terminal of the third drive switch receives a cooling signal from the injection molding machine, it controls the third circuit to open, causing the second solenoid valve 200 to be in a first state. Thus, by using the cooling signal from the injection molding machine to control the second solenoid valve 200 to enter its first state, the condenser 500 generates low-temperature cooling gas, which is then delivered to the mold cavity for rapid cooling. This linkage control based on the injection molding machine's cooling signal provides good real-time performance and eliminates the need for additional control mechanisms.

[0089] This embodiment extracts the injection, cooling, and ejection signals from the injection molding machine and connects these three sets of signals in series to the corresponding solenoid valve ports. The signals emitted by the injection molding machine during product injection control the path of the compressed gas, enabling different components (vacuum generator, cooler, and pneumatic three-way ball valve) to operate. This achieves real-time generation of negative pressure suction, cooling, and exhaust ejection. The signals are linked and switched in real time, assisting mold production at extremely low cost. The process is simple and clear, with significant cost reduction and efficiency improvement, making it very suitable for widespread promotion.

[0090] like Figures 3-15 An example of an injection mold for an injection molding machine includes a first mold 600, a second mold 700, and the aforementioned control system.

[0091] like Figures 5-8 As shown, the first mold 600 has a first mold body 601, a core 602 mounted on the first mold body 601, and an inlet / outlet channel 603 communicating the third air port Q3 with the gas in the mold cavity. In some practical applications, the inlet / outlet channel 603 includes a first channel 6031 formed on the first mold body 601 and a second channel 6032 formed on the core 602 communicating with the first channel 6031. In other practical applications, the core 602 is a detachable, breathable insert mounted on the first mold body 601. Figure 9 , Figure 10As shown, in some practical applications, the venting insert includes a beryllium copper insert body 6021 and an exhaust steel 6022 embedded in the beryllium copper insert body 6021; the second channel 6032 is formed on the beryllium copper insert body 6021, and the exhaust steel 6022 is located at the end of the second channel 6032; and the exhaust steel 6022 is made of steel with micro-pores of about 0.02mm, allowing gas (e.g., air) to pass through, but molten plastic cannot pass through; in this way, gas communication between the second channel 6032 and the mold cavity (the cavity between the outer surface of the core and the inner wall of the cavity) can be achieved (the gas in the second channel can communicate with the mold cavity through the micro-pores inside the exhaust steel). In this way, during the injection of molten material into the mold cavity, under the action of the vacuum generator 400, the gas in the mold cavity is discharged sequentially through the micro-pores of the venting steel 6022, the second channel 6032, the first channel 6031, the third vent Q3, the first vent Q1, the vacuum port V4, and the outlet R4. This generates negative pressure in the mold cavity, accelerates the flow rate of the molten material, and simultaneously extracts high-temperature gas, resulting in excellent venting and solving the problem of trapped gas. This significantly extends the effective production cycle of the mold and greatly improves production efficiency. When it is necessary to cool the injection-molded part, the low-temperature cooling gas generated by the cooler 500 (using the principle of air vortex) enters the mold cavity sequentially through the cold end outlet C5, the second vent Q2, the third vent Q3, the first channel 6031, the second channel 6032, and the micro-pores of the venting steel 6022. This rapidly cools the core 602 and the injection-molded part, allowing the product to quickly solidify and smoothly exit the mold cavity. In addition, the low-temperature cooling gas generated by the condenser 500 is delivered into the mold cavity, which can blow off the deposits on the pores (micro-pores of the exhaust steel, the same below) on the surface of the core 602, so as to ensure the cleanliness of the surface of the core 602 and the air permeability of the pores on the surface of the core 602 in the next injection molding.

[0092] like Figure 11 , Figure 12 As shown, the second mold 700 has a second mold body 701 and a cavity 702 located on the second mold body 701. As... Figure 3 , Figure 4 As shown, when the first mold 600 and the second mold 700 are closed, the core 602 and the cavity 702 cooperate to form an injection molding cavity 800. In some practical applications, the second mold 700 is also provided with an air inlet channel 703 that communicates with the working port A2 of the second solenoid valve 200, and an air top valve 704 located at the end of the air inlet channel 703, the output end of which is located at the bottom of the cavity 702.

[0093] like Figures 13-15 As shown, in some other practical applications, the air-top valve 704 includes:

[0094] A cylinder barrel 7041 is disposed on the second mold body 701; a first step portion 70411, a second step portion 70412, and a third step portion 70413 are respectively formed on the inner wall of the cylinder barrel 7041;

[0095] The piston rod 7042 is coaxially disposed inside the cylinder barrel 7041; the first end of the piston rod 7042 (as the output end of the air top valve) has a limiting part 70421 that cooperates with the first stepped part 70411;

[0096] Bolt 7043 is threadedly connected to the second end of piston rod 7042;

[0097] The gasket 7044 is coaxially sleeved on the threaded part of the bolt 7043 and is pressed against the second end of the piston rod 7042 by the head of the bolt 7043, thereby limiting the position of the gasket 7044;

[0098] Spring 7045 is coaxially sleeved outside piston rod 7042, and its two ends abut against the end faces of second step portion 70412 and gasket 7044 respectively;

[0099] The piston rod 7042 is movable along its axis relative to the cylinder 7041 between a first position and a second position; in the first position, the limiting portion 70421 abuts against the first step portion 70411, and the gasket 7044 disengages from contact with the third step portion 70413; in the second position, the limiting portion 70421 disengages from contact with the first step portion 70411, the gasket 7044 abuts against the third step portion 70413, and the spring 7045 is compressed (relative to the first position). At this time, the second solenoid valve 200 is activated. Compressed gas from port A2, after passing through intake channel 703, is output from the output end of the ejector valve through the gap between piston rod 7042 and cylinder 7041. The compressed gas fully contacts the injection molded part, generating a large thrust across the entire surface, separating the injection molded part from the cavity 702. This effectively prevents localized deformation of the injection molded part, making it ideal for ejecting thin-walled and deep-cavity parts (thin-walled and deep-cavity parts have the characteristic of thin walls and deep depth; using conventional ejector pins may create a negative pressure space during ejection, causing the product to be stuck and resulting in a high defect rate). In some practical applications, compressed gas from working port A2 of the second solenoid valve 200 forces piston rod 7042 to move from the first position to the second position; when the intake port P2 of the second solenoid valve 200 is not connected to working port A2, spring 7045 forces piston rod 7042 to move from the second position to the first position.

[0100] An injection molding method, using the injection mold described above, includes:

[0101] In response to the injection signal from the injection molding machine, the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 both enter their respective first states. Compressed gas sequentially passes through the air inlet P1 and working port B1 of the first solenoid valve 100 and then enters the air inlet P4 of the vacuum generator 400. The vacuum generator 400 generates suction at its vacuum port V4, creating a negative pressure in the mold cavity and accelerating the flow of the molten injection molding material. Specifically, after receiving the injection signal from the injection molding machine, the signal input terminal of the first drive switch controls the first circuit to be connected, so that the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 are both in their respective first states. At the same time, since the signal input terminals of the second drive switch and the third drive switch do not receive the signal from the injection molding machine, the second circuit and the third circuit are disconnected, and the second solenoid valve 200 is in a sealed state. At this time, the compressed gas enters the vacuum generator 400 through the air inlet P1 and working port B1 of the first solenoid valve 100 in sequence, and then enters the air inlet P4 of the vacuum generator 400. The Venturi effect is used to generate suction at its vacuum port V4, so that a negative pressure is formed in the mold cavity (the specific method has been described above and will not be repeated). This accelerates the flow of the molten injection material and avoids air entrapment at the end of the molten material flow as much as possible, so that the molten material can fill the end of the molten material flow.

[0102] In response to the cooling signal from the injection molding machine, the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 both enter their respective second states, and the second solenoid valve 200 enters its first state. Compressed gas passes sequentially through the inlet P1 and working port A1 of the first solenoid valve 100, then sequentially through the inlet P2 and working port B2 of the second solenoid valve 200, and subsequently enters the inlet P5 of the cooler 500. The cooler 500 generates cooling gas at its cold end outlet C5 and delivers it into the mold cavity to cool the injection-molded part. Specifically, after receiving the cooling signal from the injection molding machine, the signal input terminal of the third drive switch controls the third circuit to be connected, causing the second solenoid valve 200 to be in its first state. At the same time, since the signal input terminal of the first drive switch does not receive the signal from the injection molding machine, the first circuit is disconnected, and the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 both enter their respective second states. At this time, the compressed gas passes through the inlet P1 and working port A1 of the first solenoid valve 100 in sequence, then through the inlet P2 and working port B2 of the second solenoid valve 200 in sequence, and then enters the inlet P5 of the cooler 500; the cooler 500 generates cooling gas at its cold end outlet C5 and delivers it into the mold cavity (the specific method has been described above and will not be repeated here) to cool the injection molded part.

[0103] In some practical applications, the injection molding method further includes: in response to the ejection signal of the injection molding machine, both the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 enter their respective second states, and the second solenoid valve 200 also enters its second state. This allows compressed gas to sequentially pass through the air inlet P1 and working port A1 of the first solenoid valve 100, and then sequentially through the air inlet P2 and working port A2 of the second solenoid valve 200, delivering compressed gas to the air inlet channel of the second mold of the injection mold, thereby separating the injection-molded part from the cavity 702. Specifically, after receiving the ejection signal from the injection molding machine, the signal input terminal of the second drive switch controls the second circuit to be connected, causing the second solenoid valve 200 to be in its second state. Simultaneously, since the signal input terminal of the first drive switch does not receive a signal from the injection molding machine, the first circuit is disconnected, and both the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 enter their respective second states. At this time, the compressed gas passes through the air inlet P1 and working port A1 of the first solenoid valve 100 in sequence, and then through the air inlet P2 and working port A2 of the second solenoid valve 200 in sequence, and is delivered to the air inlet channel of the second mold of the injection mold to separate the injection molded part from the cavity 702. The specific method has been described above and will not be repeated here.

[0104] An injection molding method, using the injection mold described above, includes:

[0105] After the injection molding machine is turned on, the first mold 600 and the second mold 700 are closed, so that the core 602 and the cavity 702 cooperate to form the injection molding cavity 800;

[0106] Molten injection molding material is injected into the mold cavity, and the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 are both controlled to enter their respective first states, so that the compressed gas enters the air inlet P1 and working port B1 of the first solenoid valve 100 in sequence and then enters the air inlet P4 of the vacuum generator 400; the vacuum generator 400 generates suction at its vacuum port V4, so that a negative pressure is formed in the mold cavity, accelerating the flow of molten injection molding material; the specific implementation method is as described above, and will not be repeated here.

[0107] Pressure holding; at this time, the first circuit, the second circuit, and the third circuit are all disconnected, the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 are both in their respective second states, the second solenoid valve 200 is in the middle-closed state, the air passage of the whole system is not open, and it is temporarily in a closed state to save compressed gas.

[0108] Cooling; the first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 are both controlled to enter their respective second states, and the second solenoid valve 200 is controlled to enter the first state, so that the compressed gas passes sequentially through the air inlet P1 and working port A1 of the first solenoid valve 100, then sequentially through the air inlet P2 and working port B2 of the second solenoid valve 200, and then enters the air inlet P5 of the cooler 500; the cooler 500 generates cooling gas at its cold end outlet C5, and delivers it sequentially through the second air port Q2, the third air port Q3, and the air inlet / outlet channel 603 into the mold cavity to cool the injection molded part; the specific implementation method is as described above and will not be repeated here.

[0109] The mold is opened, allowing the core 602 to exit from the cavity 702. At this time, the first circuit, the second circuit, and the third circuit are all disconnected. The first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 are both in their respective second states, and the second solenoid valve 200 is in the middle-closed state. The air passage of the entire system is blocked and is temporarily in a closed state, saving compressed gas.

[0110] The first solenoid valve 100 and the pneumatic three-way ball valve assembly 300 are both put into their respective second states, and the second solenoid valve 200 is put into its second state. This causes the compressed gas to pass through the air inlet P1 and working port A1 of the first solenoid valve 100 in sequence, and then through the air inlet P2 and working port A2 of the second solenoid valve 200 in sequence, and then enter the air intake channel 703. This separates the injection molded part from the cavity 702. The specific implementation method is as described above and will not be repeated here.

[0111] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A control system for injection molds, characterized in that... include: The first solenoid valve (100) has an air inlet P1, a working port A1 and a working port B1, wherein the air inlet P1 is connected to an external compressed air source; the first solenoid valve (100) has a first state and a second state, in the first state the air inlet P1 and the working port B1 are connected, and in the second state the air inlet P1 and the working port A1 are connected. The second solenoid valve (200) has an air inlet P2, a working port A2, and a working port B2, wherein the air inlet P2 is connected to the working port A1 of the first solenoid valve (100); the second solenoid valve (200) has a first state in which the air inlet P2 and the working port B2 are connected. A pneumatic three-way ball valve assembly (300) has a first air port Q1, a second air port Q2, and a third air port Q3, wherein the third air port Q3 is connected to the air inlet / outlet channel of the first mold of the injection mold, and the air inlet / outlet channel is connected to the gas in the mold cavity of the injection mold; the pneumatic three-way ball valve assembly (300) has a first state and a second state, wherein in the first state, the first air port Q1 and the third air port Q3 are connected, and in the second state, the second air port Q2 and the third air port Q3 are connected; The vacuum generator (400) has its air inlet P4 connected to the working port B1 of the first solenoid valve (100) and its vacuum port V4 connected to the first air port Q1 of the pneumatic three-way ball valve assembly (300). The cooler (500) has its air inlet P5 connected to the working port B2 of the second solenoid valve (200), and its cold end outlet C5 connected to the second air port Q2 of the pneumatic three-way ball valve assembly (300). When the first solenoid valve (100) and the pneumatic three-way ball valve assembly (300) are both in their respective first states, the air inlet and outlet channels of the first mold of the injection mold are under negative pressure under the action of the vacuum generator (400); when the first solenoid valve (100) and the pneumatic three-way ball valve assembly (300) are both in their respective second states and the second solenoid valve (200) is in the first state, the cooler (500) delivers cooled gas to the air inlet and outlet channels of the first mold of the injection mold.

2. The control system for injection molds according to claim 1, characterized in that, The working port A2 of the second solenoid valve (200) is connected to the air inlet channel of the second mold of the injection mold; the second solenoid valve (200) has a second state in which the air inlet P2 and the working port A2 are connected to deliver compressed gas to the air inlet channel of the second mold of the injection mold.

3. The control system for injection molds according to claim 1, characterized in that, The pneumatic three-way ball valve assembly (300) includes: A pneumatic three-way ball valve (301) has a pneumatic actuator (3011) and a valve body (3012); the first air port Q1, the second air port Q2 and the third air port Q3 are located on the valve body (3012); The third solenoid valve (302) has an air inlet P3, a working port A3, and a working port B3. The air inlet P3 is connected to an external compressed air source, and the working ports A3 and B3 are respectively connected to the two air inlets of the cylinder of the pneumatic actuator (3011) to realize the switching of the pneumatic three-way ball valve assembly (300) between the first state and the second state.

4. The control system for injection molds according to claim 3, characterized in that, The coil of the first solenoid valve (100), the coil of the third solenoid valve (302), and the first power supply are connected in series to form a first circuit. A first drive switch that controls the opening and closing of the circuit is also connected in series on the first circuit. After receiving the injection signal from the injection molding machine, the signal input terminal of the first drive switch controls the first circuit to be turned on, so that the first solenoid valve (100) and the pneumatic three-way ball valve assembly (300) are both in their respective first states.

5. The control system for injection molds according to claim 2, characterized in that, The second solenoid valve (200) has a second coil, which is connected in series with the second power supply to form a second circuit. A second drive switch that controls the opening and closing of the circuit is also connected in series on the second circuit. After receiving the ejection signal from the injection molding machine, the signal input terminal of the second drive switch controls the second circuit to be turned on, so that the second solenoid valve (200) is in the second state.

6. The control system for injection molds according to claim 1, characterized in that, The second solenoid valve (200) has a first coil, which is connected in series with a third power supply to form a third circuit. A third drive switch that controls the opening and closing of the circuit is also connected in series on the third circuit. After receiving the cooling signal from the injection molding machine, the signal input terminal of the third drive switch controls the third circuit to be turned on, so that the second solenoid valve (200) is in the first state.

7. An injection mold for an injection molding machine, characterized in that... include: The first mold (600) has a first mold body (601) and a core (602) mounted on the first mold body (601); The second mold (700) has a second mold body (701) and a cavity (702) located on the second mold body (701); The control system according to any one of claims 1-6; When the first mold (600) and the second mold (700) are closed, the core (602) and the cavity (702) cooperate to form an injection molding cavity; and the first mold (600) also has an air inlet and outlet channel (603) to connect the third air port Q3 with the gas in the mold cavity.

8. The injection mold for an injection molding machine according to claim 7, characterized in that, The air inlet / outlet channel (603) includes a first channel (6031) formed on the first mold body (601) and a second channel (6032) formed on the core (602); the core (602) is a detachable air-permeable insert installed on the first mold body (601).

9. The injection mold for an injection molding machine according to claim 7, characterized in that, When claim 7 refers to claim 2, the second mold (700) is further provided with an air intake channel (703) communicating with the working port A2 of the second solenoid valve (200), and an air top valve (704) located at the end of the air intake channel (703), the output end of which is located at the bottom of the cavity (702).

10. An injection molding method, characterized in that, Injection molding using the injection mold as described in claim 7 includes: In response to the injection signal from the injection molding machine, the first solenoid valve (100) and the pneumatic three-way ball valve assembly (300) both enter their respective first states. The compressed gas passes through the air inlet P1 and working port B1 of the first solenoid valve (100) in sequence and then enters the air inlet P4 of the vacuum generator (400). The vacuum generator (400) generates suction at its vacuum port V4, which creates a negative pressure in the mold cavity and accelerates the flow of the molten injection molding material. In response to the cooling signal of the injection molding machine, the first solenoid valve (100) and the pneumatic three-way ball valve assembly (300) both enter their respective second states, and the second solenoid valve (200) enters the first state. The compressed gas passes through the air inlet P1 and working port A1 of the first solenoid valve (100) in sequence, and then through the air inlet P2 and working port B2 of the second solenoid valve (200) in sequence, and then enters the air inlet P5 of the cooler (500). The cooler (500) generates cooling gas at its cold end outlet C5 and delivers it into the mold cavity to cool the injection molded part.

11. The injection molding method according to claim 10, wherein when claim 7 refers to claim 2, the injection molding method further comprises: In response to the ejection signal of the injection molding machine, the first solenoid valve (100) and the pneumatic three-way ball valve assembly (300) both enter their respective second states, and the second solenoid valve (200) enters the second state, so that the compressed gas passes through the air inlet P1 and working port A1 of the first solenoid valve (100) in sequence, and then passes through the air inlet P2 and working port A2 of the second solenoid valve (200) in sequence, and delivers the compressed gas to the air inlet channel of the second mold of the injection mold, thereby separating the injection molded part from the cavity (702).

12. An injection molding method, characterized in that, Injection molding is performed using the injection mold described in claim 7. When claim 7 refers to claim 2, the injection molding method includes: After the injection molding machine is turned on, the first mold (600) and the second mold (700) are closed, so that the core (602) and the cavity (702) cooperate to form an injection molding cavity; Molten injection material is injected into the mold cavity, and the first solenoid valve (100) and the pneumatic three-way ball valve assembly (300) are both controlled to enter their respective first states, so that the compressed gas enters the air inlet P1 and working port B1 of the first solenoid valve (100) in sequence and then enters the air inlet P4 of the vacuum generator (400); the vacuum generator (400) generates suction at its vacuum port V4, so that a negative pressure is formed in the mold cavity, which accelerates the flow of molten injection material; The first solenoid valve (100) and the pneumatic three-way ball valve assembly (300) are both put into their respective second states, and the second solenoid valve (200) is put into its first state, so that the compressed gas passes through the air inlet P1 and working port A1 of the first solenoid valve (100) in sequence, then through the air inlet P2 and working port B2 of the second solenoid valve (200), and then enters the air inlet P5 of the cooler (500); the cooler (500) generates cooling gas at its cold end outlet C5, and delivers it into the mold cavity in sequence through the second air port Q2, the third air port Q3, and the air inlet and outlet channel (603) to cool the injection molded part; The mold is opened, allowing the core (602) to exit from the cavity (702); The first solenoid valve (100) and the pneumatic three-way ball valve assembly (300) are both put into their respective second states, and the second solenoid valve (200) is put into its second state, so that the compressed gas passes through the air inlet P1 and working port A1 of the first solenoid valve (100) in sequence, and then passes through the air inlet P2 and working port A2 of the second solenoid valve (200) in sequence, and then enters the air intake channel (703), thereby separating the injection molded part from the cavity (702).

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