Injection molding apparatus and method of injection molding

Abstract

The application discloses an injection molding device and an injection molding method thereof, and belongs to the injection molding field.The device comprises an injection molding module, a blowing module and a vacuumizing module;the injection molding module is provided with a movable mold, a fixed mold and a controller, the controller is used for controlling the movable mold and the fixed mold to be closed or opened, the fixed mold is provided with a vent hole;the blowing module comprises a peripheral air storage tank and an air compressor, the air compressor is connected with the peripheral air storage tank;the vacuumizing module is connected with the vent hole on the fixed mold and the peripheral air storage tank through pipelines;the vacuumizing module comprises a vacuum pump, an air storage tank, a switching valve and an electromagnetic valve which are connected in sequence.The application can provide better air extraction and air suction effects for the injection molding module, and improve the product quality and production efficiency;further, the application provides an injection molding method, which can quickly and efficiently perform injection molding products, and improves the injection molding efficiency and the finished product rate of the injection molding products.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of injection molding, and particularly relates to an injection molding device and an injection molding method thereof. BACKGROUND

[0002] The injection molding machine is also called injection molding machine or injection machine. It is the main molding equipment for making various shaped plastic products by using thermoplastic or thermosetting plastic and plastic molding mold. The injection molding device is a tool for producing plastic products and a tool for giving the plastic products complete structure and accurate size. With the continuous development of science and technology and the continuous progress of society, the requirements for the quality and appearance of injection molding products are getting higher and higher, so it is necessary to improve the injection molding mold and the injection molding method.

[0003] In the process of plastic molding, the mold opening and closing of the injection molding module have high requirements, which ensure the integrity of the appearance, color, luster and the like; and the accuracy of the size and relative position of the injection molding product. In the injection molding process, the injection molding module needs to be aspirated and blown, and the air suction and air suction affect the quality of the product. The air suction and air suction device commonly used in the injection molding device on the market has a complex structure, poor air suction and air suction effect, causes product air trapping, color difference and the like, low degree of automation, low production efficiency, and affects normal industrial production. SUMMARY

[0004] In view of the above-mentioned deficiencies of the prior art, the purpose of the present application is to provide an injection molding device which can provide better air suction and air suction effect through the vacuum suction module and the air blowing module, improve the quality and production efficiency of the injection molding product; further, the present application provides an injection molding method which improves the degree of automation in the injection molding process and improves the efficiency of the injection molding and the yield of the injection molding product.

[0005] To achieve the above-mentioned purpose of the application, the present application provides the following technical solutions: on one hand, the present application provides an injection molding device, comprising: an injection molding module, an air blowing module and a vacuum suction module; the injection molding module is provided with a movable mold, a fixed mold and a controller, the controller is used for controlling the movable mold and the fixed mold to close or open, the fixed mold is provided with a vent hole, the vent hole is used for air blowing or vacuum suction to the mold cavity between the upper mold and the lower mold;

[0006] The air blowing module comprises a peripheral gas tank and an air compressor, the air compressor is connected with the peripheral gas tank, and a positive pressure sensor is arranged in the peripheral gas tank; the peripheral gas tank is connected with the vent hole through an air blowing pipeline;

[0007] The vacuum pumping module comprises a vacuum pump, a gas storage tank, a switching valve and a solenoid valve connected in sequence; the gas storage tank is provided with a negative pressure sensor, and the gas storage tank is connected with the air hole through a vacuum pumping pipeline; the gas blowing pipeline and the vacuum pumping pipeline are merged and then communicated with the air hole through a first pipeline; the solenoid valve is located on the gas blowing pipeline, and the switching valve is located at the merging position of the pipelines; a first interface of the solenoid valve is connected with a first port of the switching valve, and a second interface is connected with the peripheral gas storage tank; a second port of the switching valve is connected with the gas storage tank, and a third port is connected with the air hole on the injection molding module through a pipeline; the vacuum pumping module further comprises a PLC controller.

[0008] The injection molding device improves the product yield and production efficiency through the cooperation of the vacuum pumping module, the gas blowing module and the injection molding module; the vacuum pumping module can perform vacuum pumping on the injection molding module, reduces the air trapping, color difference and air line problems, improves the pressure in the mold, improves the flowability of the plastic in the mold, and makes the filling effect better, especially shortens the filling time, shortens the production cycle of the product, and improves the production efficiency.

[0009] The gas blowing module comprises one or more air compressors connected with the peripheral gas storage tank; the vacuum pumping module comprises one or more vacuum pumps connected with the gas storage tank. The multiple air compressors are controlled by the PLC controller to work on the peripheral gas storage tank in turn, and the multiple vacuum pumps are controlled by the PLC controller to work on the gas storage tank in turn. The beneficial effect of the technical solution is that when working continuously for a long time, in order to prevent the air compressor and the vacuum pump from working frequently and causing overheating or excessive load, multiple air compressors and multiple vacuum pumps are arranged to work in turn to reduce the load of the vacuum pump and the air compressor, so as to ensure the safety and efficiency of the production process.

[0010] The first pipeline is provided with a cooling device comprising a refrigerating machine, a temperature sensor and a cooling member; the temperature sensor is arranged in the first pipeline, the refrigerating machine is connected with the cooling member, and the cooling member is installed on the first pipeline; the temperature sensor and the refrigerating machine are connected with the PLC controller. The beneficial effect of the technical solution is that the cooling device is used to cool the gas for blowing and vacuum pumping; when vacuum pumping, the high temperature of the injection molding module will make the temperature of the gas too high, which will affect the safety of the switching valve, the gas storage tank and the vacuum pump; the cooling of the gas prevents the vacuum pump and the gas storage tank from failing under high temperature and high pressure. When the gas blowing module blows the injection molding module, the temperature of the gas is reduced after passing through the cooling device, which can accelerate the molding of the injection product, reduce the required time and improve the production efficiency; the refrigerating machine generates cold energy, the temperature sensor is used to reflect the temperature of the first pipeline, prevents the gas from being liquefied due to too low temperature, or the temperature is too high and the cooling effect is not achieved, and the cooling member is used to conduct the cold energy of the refrigerating machine to the gas in the first pipeline to achieve the cooling effect.

[0011] The temperature sensor comprises a first temperature sensor and a second temperature sensor arranged in sequence along the first pipeline, and the first temperature sensor and the second temperature sensor are respectively located on two sides of the cooling guide. The first temperature sensor close to the injection molding module is used to detect the temperature of the gas after passing through the cooling device during blowing, and the second temperature sensor close to the switching valve is used to detect the temperature of the gas after passing through the cooling device during pumping.

[0012] The cooling guide is a cooling sleeve, which is sleeved on the outer surface of the first pipeline. The cooling sleeve is detachably mounted on the outside of the first pipeline, and can be connected through buckling or through pre-set screw holes and screw nuts. The cooling sleeve can be installed at different positions of the first pipeline according to different needs, facilitating later maintenance and transportation.

[0013] The cooling guide is a cooling cylinder, which is mounted in the middle of the first pipeline, and the two end faces thereof are connected with the first pipeline. The two end faces and the inside of the cooling guide are provided with a plurality of holes for the gas to pass through. The cooling cylinder is arranged between the first pipeline and the air exchange hole of the injection molding module, so that the refrigeration effect is better, and the refrigeration machine is prevented from working frequently, thereby saving power and causing load.

[0014] The switching valve and the air tank are further provided with a purification device for purifying air. A first filter layer and a second filter layer are arranged in sequence in the pipeline from the switching valve to the air tank. The first filter layer is composed of non-woven fabric and activated carbon, and the second filter layer is composed of a desiccant of calcium chloride and calcium sulfate. The purification device is used for purifying the air in the mold cavity pumped by the vacuum pumping module, removing condensed gas and dust in the gas, and preventing these components in the gas from causing failure of the vacuum pump and the air tank.

[0015] The application further provides an injection molding method comprising the injection molding device.

[0016] The controller transmits a signal to the movable mold to start the mold closing;

[0017] When the mold is closed to the position, the controller sends a signal to the PLC controller, the switching valve is powered on and switched to the second port connected with the vacuum pumping module to open, and the first port connected with the blowing module is closed, the vacuum pumping module starts to pump the injection molding module, and a vacuum is formed in the mold cavity; the electromagnetic valve is in a closed state;

[0018] After the vacuum pumping is completed, the second port of the switching valve is closed, the first port is opened, and the pumping is stopped; the injection molding module is injected with glue, and after the injection is completed, the molding is waited;

[0019] The controller transmits a signal to the movable mold to start the mold closing;

[0020] When the mold is opened to the position, the controller sends a signal to the PLC controller, the electromagnetic valve is powered on, and the peripheral gas storage tank starts to blow the injection molding module;

[0021] When the blowing stops, the controller sends a signal to the PLC controller, the electromagnetic valve is powered off, the product is taken out, and the next cycle of injection molding is performed.

[0022] Further, a purification device for purifying air is arranged between the switching valve and the gas storage tank, when the vacuum module starts to pump the injection molding module, the gas is purified and then enters the gas storage tank and the vacuum pump. The purification device purifies the gas pumped out of the air hole during the injection molding process, removes dust particles and steam in the air, and reduces the failure of the vacuum pump and the gas storage tank in the vacuum module.

[0023] A cooling device is also included, which is arranged on the first pipeline and connected to the PLC controller. The cooling device cools the gas entering and exiting the air hole under the control of the PLC controller. When blowing, the cooled gas can accelerate the molding of the injection molded product, reduce the waiting time, and improve the production efficiency, and also pre-cool the mold cavity. When pumping, the pre-cooled mold cavity gas passes through the cooling device again to further reduce the gas temperature, avoid failure of the vacuum pump and the gas storage tank in the vacuum, and thus affect the production efficiency.

[0024] Compared with the prior art, the injection molding device improves the yield and production efficiency of the product by cooperating the vacuum module, the blowing module and the injection molding module. The vacuum module can pump the injection molding module, reduce the air trapping, color difference and air line problems, improve the pressure in the mold, improve the flowability of the plastic in the mold, and make the filling effect better, especially shorten the filling time, shorten the production cycle of the product, and improve the production efficiency. At least one air compressor and at least one vacuum pump are used to prevent the machine from overheating and causing failure and other problems during continuous operation; the blowing module blows the injection molding module to accelerate the cooling and molding of the product. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1is a first embodiment of the injection molding device of the present application connection diagram;

[0027] Figure 2 is a second embodiment of the injection molding device of the present application connection diagram;

[0028] Figure 3 is a vacuum module of the present application connection diagram;

[0029] Figure 4 is a third embodiment of the present application part connection diagram;

[0030] Figure 5 is a fourth embodiment of the present application part connection diagram;

[0031] Figure 6 is a fifth embodiment of the present application part injection molding method flow chart.

[0032] Figure 1- vacuum pump, 2- air tank, 21- negative pressure sensor, 3- switch valve, 31- first port, 32- second port, 33- third port, 4- electromagnetic valve, 41- first interface, 42- second interface, 43- reversing port, 5- peripheral air tank, 51- positive pressure sensor, 6- air compressor, 7- injection molding module, 8- controller, 9- first pipeline, 91- first temperature sensor, 92- second temperature sensor 10- cooling device, 12- purification device, 13- control screen, 131- PLC controller, 14- three color lamp, 15- buzzer. DETAILED DESCRIPTION

[0033] The technical solutions in the specific embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0034] As Figure 1 shown is an embodiment 1 of the injection molding device of the present application, in this embodiment, it should be noted that in order to describe the technical scheme more specifically, the steps described in this embodiment do not strictly correspond to the steps described in the part of the invention.

[0035] The present application provides an injection molding device, comprising: injection molding module, blowing module and vacuum module.

[0036] The injection molding module is provided with a movable mold, a fixed mold and a controller 8, the controller 8 is used for controlling the movable mold and the fixed mold to be closed or opened; the fixed mold is provided with a vent hole; the blowing module comprises a peripheral air tank 5 and an air compressor 6 connected in series, the peripheral air tank 5 is provided with a positive pressure sensor 51 for detecting the air pressure of the peripheral air tank 5; the peripheral air tank 5 is connected with the vent hole through a blowing pipeline; the air compressor 6, the peripheral air tank 5 and the electromagnetic valve 4 are connected in series. The blowing module is used for blowing the injection molding module, the electromagnetic valve 4 is used for opening and closing the blowing pipeline between the peripheral air tank 5 and the switching valve 3. The vacuum pumping module comprises a vacuum pump 1, an air tank 2, a switching valve 3 and an electromagnetic valve 4 connected in series; the air tank 2 is provided with a negative pressure sensor 21, and the air tank 2 is connected with the vent hole through a vacuum pumping pipeline;

[0037] The blowing pipeline and the vacuum pumping pipeline are connected with the vent hole through a first pipeline 9 after being merged, the electromagnetic valve 4 is located on the blowing pipeline, and the switching valve 3 is located at the merging position of the pipelines; referring to Figure 1 , and combining Figure 4 and Figure 5 , the electromagnetic valve 4 is a three-way electromagnetic valve, a first interface 41 of the electromagnetic valve 4 is connected with a first port 31 of the switching valve 3, and a second interface 42 is connected with the peripheral air tank 5; a second port 32 of the switching valve 3 is connected with the air tank 2, a third port 33 is connected with the vent hole, and a third interface of the electromagnetic valve 4 is a reversing port 43, which is not connected with other structures; when the second interface of the electromagnetic valve 4 is closed, the residual air pressure in the blowing pipeline between the electromagnetic valve 4 and the switching valve 3 is discharged through the reversing port 43, and the adjustment and repair operation of the equipment can be safely carried out in the later period; preferably, the volume of the air tank 2 is 4-6 liters, and most preferably 5 liters. The volume of the air tank 2 is proportional to the size of the mold cavity of the injection molding module, and when the volume of the air tank 2 is not less than 4 liters in the embodiment, the purpose of forming a vacuum in the mold cavity of the injection molding module can be achieved, which can provide sufficient clamping force for the injection molding module to resist the mold cavity pressure generated by the molten plastic entering the mold cavity, prevent the mold from being opened, cause the product to be in a poor condition, and the quality of the injection molded product is higher. If the volume of the air tank 2 is too large, the volume of the injection molding device will increase, which will waste space and resources. In other embodiments, the size of the air tank 2 can also be appropriately increased or decreased according to the size of the mold cavity.

[0038] When the injection molding module needs to be pumped, the second port 32 of the switching valve 3 is opened, the first port 31 is closed, the vacuum pump 1 works, a negative pressure is formed in the air tank 2, and the injection molding module is pumped through the vent hole; when the injection molding module needs to be blown, the second port 32 of the switching valve 3 is closed, the first port 31 is opened, the second interface 42 of the electromagnetic valve 4 is opened, the reversing port 43 is closed, a full open channel is formed between the air compressor 6 and the vent hole, the air compressor 6 starts to work, the peripheral air tank 5 forms a positive pressure, and the injection molding module starts to be blown.

[0039] As shown in Figure 3 The vacuumizing module further comprises a PLC controller 131, a control panel 13, a three-color light 14 and a buzzer 15 connected in sequence. The PLC controller 131 controls the opening and closing of the passage of the switching valve through the signal given by the injection module, and controls the start and stop of the vacuum pump and air compressor through the positive pressure sensor and negative pressure sensor. The control panel is a touch screen, which is used to set the vacuumizing time and blowing time, and to monitor the parameters and display the working state. The three-color light 14 comprises red light, green light and orange light, and different lights represent different operating states under the control of the PLC controller 131. The red light is on when the power is on and the emergency stop is on; the red light + buzzer is on when abnormal situation occurs or fault occurs during operation; the green light is on during normal operation; and the orange light is on when the function is temporarily suspended during normal operation.

[0040] Example 2

[0041] As shown in Figure 2 This embodiment is based on example 1, and a cooling device 10 is arranged on the first pipeline 9. The cooling device 10 is connected with the PLC controller 131. The cooling device 10 comprises a refrigerating machine, a temperature sensor and a cooling guide. The temperature sensor is arranged in the first pipeline 9. The refrigerating machine is connected with the cooling guide, and the cooling guide is installed on the first pipeline 9. The temperature sensor and the refrigerating machine are connected with the PLC controller 131 respectively. Preferably, the temperature sensor comprises a first temperature sensor 91 and a second temperature sensor 92, which are respectively located on the two sides of the cooling guide. The cooling guide is a cooling sleeve, which is sleeved on the outer surface of the first pipeline 9. Alternatively, the cooling guide is a cooling cylinder, which is installed in the middle of the first pipeline 9, and the two end faces thereof are connected with the first pipeline 9. The two end faces and the inside of the cooling guide are provided with a plurality of holes through which gas can pass. When the blowing module blows air to the injection module, the gas is cooled by the cooling device 10, which can accelerate the cooling and molding of the product and reduce the waiting time. When the vacuumizing module pumps air to the injection module, the gas is cooled by the cooling device, which reduces the influence of high-temperature gas on the air tank 2 and the vacuum pump 1, increases the service life of the vacuumizing module, reduces the frequency of maintenance, and improves the production efficiency of the injection device.

[0042] The pipeline between the switching valve 3 and the gas tank 2 is also provided with a purification device 12 for purifying the air extracted from the cavity of the injection molding module, which contains dust, steam and other substances that will affect the normal operation of the gas tank 2 and the vacuum pump 1. The pipeline from the switching valve 3 to the gas tank 2 is sequentially provided with a first filter layer and a second filter layer, the first filter layer is composed of non-woven fabric and activated carbon, which mainly filters dust particles in the air, and the second filter layer is composed of drying agent, which is used to filter water vapor in the air. When the air passes through the purification device 12, it needs to be purified by the first layer and the second layer, and then enter the gas tank 2.

[0043] Example 3

[0044] In actual production, in order to prevent the air compressor 6 from working continuously and causing overload failure, as shown in Figure 5 , it is considered to use multiple air compressors 6 in a rotating mode, which can reduce the working frequency of a single air compressor 6 and increase the service life of the device. Compared with example 2, the main difference of this embodiment is that the air blowing module includes at least two air compressors 6 connected with the peripheral gas tank 5 respectively; at least two air compressors 6 are connected with the PLC controller 131, and under the control of the PLC controller 131, the two air compressors 6 work on the peripheral gas tank 5 in turn, reducing the working frequency of a single air compressor 6 and preventing it from overloading.

[0045] Example 4

[0046] Similarly, in actual production, in order to prevent the vacuum pump 1 from working continuously and causing overload failure, as shown in Figure 4 , it is considered to use multiple vacuum pumps 1 in a rotating mode. Reduce the working frequency of a single vacuum pump and increase the service life of the device. Compared with example 2, the main difference of this embodiment is that the vacuum pumping module includes at least two vacuum pumps 1 connected with the gas tank 2 respectively. At least two vacuum pumps 1 are connected with the PLC controller 131, and under the control of the PLC controller 131, the two vacuum pumps 1 work on the gas tank 2 in turn, reducing the working frequency of a single vacuum pump and increasing the service life of the device.

[0047] Example 5

[0048] Combining example 3 and example 4, in order to prevent the air compressor 6 and the vacuum pump 1 from working continuously and causing overload failure, referring to Figure 4 and Figure 5 , at least two air compressors 6 and at least two vacuum pumps 1 are used in this embodiment, which are connected with the PLC controller 131 respectively, and under the control of the PLC controller 131, at least two vacuum pumps 1 work on the peripheral gas tank 5 and the gas tank 1 in turn respectively, reducing the use frequency of a single air compressor 6 and a single vacuum pump 1, and increasing the service life of the device.

[0049] Example 6

[0050] A injection molding method, based on the injection molding device provided in Example 2, comprising an injection molding module, a blowing module and a vacuumizing module, the injection molding method is described as follows: Figure 6 , comprising the following steps:

[0051] Connect the injection molding module, the blowing module and the vacuumizing module as required, connect the power supply of the injection molding device, the red light of the three-color light 14 is on, click the start button on the control panel 13, the green light of the three-color light 14 is on, set the vacuumizing time T1 on the control panel 13, T1 is 6-10 seconds, set the blowing time T2 of the blowing module, set the range of the positive pressure sensor 51 and the negative pressure sensor 21; set the parameters of the temperature sensors at both ends of the cooling device 10, the first temperature sensor 91 close to the injection molding module works during blowing, showing the temperature of the passing gas, the second temperature sensor 92 close to the switching valve 3 works during vacuumizing, showing the temperature of the passing gas. The blowing module, the vacuumizing module and the cooling device 10 start to work under the control of the PLC controller 131, when the positive pressure sensor 51, the negative pressure sensor 21 and the temperature sensor reach the set value, stop working;

[0052] When the vacuumizing module is in standby state, the electromagnetic valve 4 is de-energized and in closed state, the switching valve 3 is energized and connected, the first port 31 and the third port 33 are connected, the second port 32 connected with the gas tank 2 is closed, at this time neither blowing nor vacuumizing is performed on the injection molding module.

[0053] The controller 8 transmits a signal to the movable die, the movable die starts to close the mold, when the mold is closed, the controller 8 transmits a signal to the PLC controller 131, the switching valve 3 is energized and switched to the second port 32 connected with the vacuumizing module, the first port 31 connected with the blowing module is closed, the channel between the vacuumizing module and the injection molding module is opened, the vacuumizing module starts to vacuumize the injection molding module, the second temperature sensor 92 works, showing the temperature of the passing gas during vacuumizing, if the temperature is higher than the normal range, the refrigerator starts to work until the temperature reaches the normal range, the refrigerator stops working. The switching valve 3 of the vacuumizing module and the gas tank 2 are also provided with a purifying device 12 for purifying air, when the vacuumizing module starts to vacuumize the injection molding module, the gas is purified by the purifying device 12 and then enters the gas tank 2 and the vacuum pump 1, until the set time T1 ends, the vacuum is formed in the mold cavity, the electromagnetic valve 4 is in closed state; the second port 32 of the switching valve 3 is closed, the first port 31 is opened, the vacuumizing is stopped;

[0054] The injection molding module forms a mold cavity directly by the upper die and the lower die under the control of the controller, after the injection is completed, the mold is cooled, the cooling time is T3;

[0055] The controller 8 sends a signal to the mold to open; when the mold is open, the controller 8 sends a signal to the PLC controller 131, the electromagnetic valve 4 is powered on, the peripheral gas storage tank 5 starts to blow the injection mold, the blowing time is T2, the first temperature sensor 91 works, displays the temperature of the gas passing through during blowing, if the temperature is within the normal range, the refrigerator does not work, if the temperature is higher than the normal range, the refrigerator starts to work until the temperature reaches the normal range, the refrigerator stops working.

[0056] T2 time is over; stop blowing, the controller 8 sends a signal to the PLC controller 131, the electromagnetic valve 4 is powered off, the switching valve 3 is powered on, the first port 31 and the third port 33 are connected, the second port 32 connected with the gas storage tank 2 is closed; take out the product, and the next round of injection molding cycle is carried out. The beneficial effects of the technical scheme are: through the cooperation of the controller 8 of the injection molding module and the PLC controller 131 of the vacuum pumping module, the automation degree in the injection molding process is improved, the quality of the product is improved, and the production efficiency is improved.

[0057] The above description of the embodiments is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An injection molding device, characterized in that, It includes: an injection molding module, an air blowing module, and a vacuuming module; the injection molding module is equipped with a moving mold, a fixed mold, and a controller (8), the controller (8) is used to control the closing or opening of the moving mold and the fixed mold, and the fixed mold is equipped with a vent hole; the air blowing module includes a connected peripheral air tank (5) and an air compressor (6), the peripheral air tank (5) is equipped with a positive pressure sensor (51), and the peripheral air tank (5) is connected to the vent hole through an air blowing pipeline; the vacuuming module includes a vacuum pump (1), an air tank (2), a switching valve (3), and a solenoid valve (4) connected in sequence; the air tank (2) is equipped with a negative pressure sensor (21), the air tank (2) is equipped with a negative pressure sensor (21), the air tank (2) is equipped with a negative pressure sensor (21), the air tank (2) is equipped with a negative pressure sensor (21), the air tank (2) is equipped with a positive pressure sensor (51), the air tank (2) is equipped with a positive pressure sensor (51), and the air tank (2) is equipped with a positive pressure sensor (51), ... The gas tank (2) is connected to the vent via a vacuuming pipeline; the blowing pipeline and the vacuuming pipeline merge and are connected to the vent via a first pipe (9); the solenoid valve (4) is located on the blowing pipeline, and the switching valve (3) is located at the junction of the above pipelines; the first interface (41) of the solenoid valve (4) is connected to the first port (31) of the switching valve (3), and the second interface (42) is connected to the peripheral gas storage tank (5); the second port (32) of the switching valve (3) is connected to the gas storage tank (2), and the third port (33) is connected to the vent; it also includes a PLC controller (131) for controlling the operation of the vacuuming module; It also includes a cooling device (10); the cooling device (10) includes a refrigerator, a temperature sensor and a cooling conductor, the temperature sensor is disposed in the first pipe (9), the refrigerator and the cooling conductor are connected, and the cooling conductor is installed on the first pipe; the temperature sensor and the refrigerator are respectively connected to the PLC controller (131).

2. The injection molding apparatus according to claim 1, characterized in that: The blowing module includes one or more air compressors (6) connected to the peripheral air tank (5); the vacuum module includes one or more vacuum pumps (1) connected to the air tank (2).

3. The injection molding apparatus according to claim 1, characterized in that: The temperature sensor includes a first temperature sensor (91) and a second temperature sensor (92) arranged sequentially along the first pipe (9), with the first temperature sensor (91) and the second temperature sensor (92) located on both sides of the cooling conductor.

4. The injection molding apparatus according to claim 1, characterized in that: The cooling component is a cooling sleeve, which is sleeved on the outer surface of the first pipe (9).

5. The injection molding apparatus according to claim 1, characterized in that: The cooling component is a cooling column, which is installed in the middle of the first pipe (9) and its two ends are connected to the first pipe (9). The two ends and the interior of the cooling component are provided with a number of channels through which gas can pass.

6. The injection molding apparatus according to claim 1 or 2, characterized in that: A purification device (12) is also provided between the switching valve (3) and the gas storage tank (2). A first filter layer and a second filter layer are sequentially provided in the pipeline from the switching valve (3) to the gas storage tank (2). The first filter layer is composed of non-woven fabric and activated carbon, and the second filter layer is composed of desiccant.

7. The injection molding method of the injection molding apparatus according to claim 1, characterized in that: The process includes the following steps: the controller (8) transmits a signal to the moving mold to start mold closing; when the mold is closed, the controller (8) sends a signal to the PLC controller (131), the switching valve (3) is energized and switches to the second port (32) connected to the vacuum module to open, and the first port (31) connected to the blowing module to close. The vacuum module starts to evacuate the injection module, and a vacuum is formed in the mold cavity. Solenoid valve (4) is in the closed state; after vacuuming is completed, the second port (32) of switching valve (3) is closed and the first port (31) is opened to stop vacuuming; the injection module injects glue, and waits for molding after the glue is injected; the controller (8) transmits a signal to the moving mold to open the mold; when the mold is in place, the controller (8) sends a signal to the PLC controller (131), the solenoid valve (4) is energized and connected, and the external air tank (5) starts to blow air into the injection module; when blowing stops, the controller (8) sends a signal to the PLC controller (131), the solenoid valve (4) is de-energized and closed; the product is taken out and the next injection cycle is carried out.

8. The injection molding method according to claim 7, characterized in that: A purification device (12) for purifying air is also provided between the switching valve (3) and the gas storage tank (2). When the vacuum module starts to evacuate the injection molding module, the gas is purified and enters the gas storage tank (2) and the vacuum pump (1).

9. The injection molding method according to claim 8, characterized in that: It also includes a cooling device (10), which is installed on the first pipe (9) and connected to the PLC controller (131); the cooling device (10) cools the gas entering and exiting the vent under the control of the PLC controller (131).

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