Quick and precise control device for injection molding machine

Abstract

The utility model provides a quick and precise control device for an injection molding machine, which relates to the technical field of injection molding machines and comprises a hydraulic oil tank for storing hydraulic oil, a hydraulic oil pump for extracting the hydraulic oil and a hydraulic oil cylinder for pushing the injection molding machine to perform injection molding, a hydraulic pipe used for circulating flow of hydraulic oil is connected among the hydraulic oil tank, the hydraulic oil pump and the hydraulic oil cylinder, and a first electromagnetic valve used for controlling connection and disconnection of an oil way is arranged between the hydraulic oil pump and an oil inlet of the hydraulic oil cylinder. And a speed regulation and control mechanism for regulating the forward speed of the hydraulic oil cylinder is also arranged between the hydraulic oil pump and the oil inlet of the hydraulic oil cylinder. And the speed adjusting mechanism can be used for adjusting materials to different injection speeds, so that the injection molding machine is more suitable for injection molding of various different products, the practicability of the device is improved, the manufacturing cost of the products is reduced, and cost reduction and efficiency improvement are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a fast and precise control device for injection molding machines. Background Art

[0002] Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment for injecting hot-melt plastic raw materials into molding molds to make plastic products of various shapes. With the acceleration of the pace of modernization, injection molding machines have been widely used in various sectors of the national economy and various fields of people's lives, such as construction, packaging, electrical and electronic equipment, agriculture, automobiles, transportation, light industry, petrochemical industry, machinery industry, and national defense industry, showing an extremely important role.

[0003] Injection molding is an important plastic processing method. During the molding process, plastic particles or powder are usually put into the barrel from the hopper. The outer wall of the traditional barrel is provided with a heating plate, and the barrel is provided with a screw that can slide along the barrel. The screw transports the plastic particles to the front section of the barrel by rotation, and the barrel is heated by the heating plate to raise its temperature to the melting temperature of the plastic. The rotation of the screw continuously delivers the molten plastic to the head of the barrel. The pressure of the head makes the screw move backward. When the screw retreats to a certain distance, the backward thrust reaches the back pressure set by the hydraulic cylinder, and the screw stops rotating. Then the hydraulic cylinder drives the screw, and the screw acts as a plunger to inject the molten plastic in the barrel into the mold cavity of the mold and then cools and forms.

[0004] In the existing related technologies, since the injection speed of conventional injection molding machines can only meet the production requirements of the raw material injection speed of some products during production, other equipment can only be used to produce products that need to meet other injection speed requirements, which increases the production cost of the products. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present invention provides a fast and precise control device for an injection molding machine, which solves the problem that different injection molding processes require different injection speeds, thereby increasing the production cost of the products.

[0006] According to an embodiment of the utility model, a fast and precise control device for an injection molding machine includes a hydraulic oil tank for storing hydraulic oil, a hydraulic oil pump for extracting hydraulic oil, and a hydraulic cylinder for driving the injection molding machine to perform injection molding. A hydraulic pipe for circulating hydraulic oil is connected between the hydraulic oil tank, the hydraulic oil pump, and the hydraulic oil cylinder. A first solenoid valve for controlling the on-off of the oil circuit is provided between the hydraulic oil pump and the oil inlet of the hydraulic oil cylinder. A speed control mechanism for adjusting the forward speed of the hydraulic oil cylinder is also provided between the hydraulic oil pump and the oil inlet of the hydraulic oil cylinder.

[0007] Through the above technical scheme, when using an injection molding machine equipped with the control device to inject molten material for injection molding, the speed adjustment mechanism can be used to adjust the material to different injection speeds, making the injection molding machine more suitable for injection molding of a variety of different products, improving the practicality of the device, reducing the production cost of the product, and being conducive to cost reduction and efficiency improvement.

[0008] Preferably, the speed control mechanism comprises a second solenoid valve, which is arranged in parallel with the first solenoid valve, and a gas pressure storage tank is also connected to the second solenoid valve, and the gas pressure storage tank is used to store hydraulic oil.

[0009] Through the above technical scheme, part of the hydraulic oil is discharged into the gas pressure storage tank, and the original gas in the gas pressure storage tank is compressed, so that the hydraulic oil in the gas pressure storage tank has a certain kinetic energy; when it is necessary to increase the propulsion speed of the hydraulic cylinder, that is, to increase the injection speed of the material, the hydraulic oil in the gas pressure storage tank is released, so that under the multiple effects of the hydraulic oil pump and the gas pressure storage tank, the hydraulic cylinder can pump more hydraulic oil into the oil inlet of the hydraulic cylinder in a short time, so that the hydraulic cylinder can push quickly, thereby improving the pushing speed of the hydraulic cylinder, and thus improving the injection speed of the material during injection molding.

[0010] Preferably, the gas pressure storage tank is filled with nitrogen.

[0011] Through the above technical solutions, nitrogen is more stable. Compared with air, nitrogen is less affected by the external temperature and is easier to control to obtain the required additional pressure value, that is, the thrust value.

[0012] Preferably, a pressure relief valve is provided between the oil outlet of the hydraulic cylinder and the hydraulic oil tank, a third solenoid valve is provided between the oil inlet of the pressure relief valve and the first solenoid valve, and a flow rate of the third solenoid valve is smaller than that of the pressure relief valve.

[0013] Through the above technical scheme, when the hydraulic cylinder needs to move quickly to a specified position, the pressure relief valve is opened, the first and second valves are opened at the same time, and the third solenoid valve is closed. The hydraulic oil pump and the gas pressure storage tank in the oil circuit simultaneously pump hydraulic oil to the hydraulic cylinder, and a large amount of hydraulic oil flows into the hydraulic cylinder instantaneously, so that the hydraulic cylinder can move quickly; when the hydraulic cylinder is about to move to the required preset position, the pressure relief valve and the second solenoid valve are closed, and the first and third solenoid valves are opened, and the flow rate of hydraulic oil flowing into the hydraulic cylinder is reduced, so that the hydraulic cylinder can accurately move to the preset position without losing pressure, so that the movement stroke of the hydraulic cylinder can be more accurately controlled, so that the device can move to the specified position quickly and accurately.

[0014] Preferably, the hydraulic oil pump comprises an oil pump and a servo motor for driving the oil pump to rotate.

[0015] Through the above technical scheme, the rotation speed of the oil pump can be conveniently controlled by using a hydraulic oil pump equipped with a servo motor, and the pressure value of the hydraulic oil in the oil circuit can be more conveniently adjusted. At the same time, the pressure value in the gas pressure storage tank can also be adjusted, so that the oil circuit pressure and the pressure value in the speed control mechanism of the device can be adjusted, further improving the practicability and reliability of the device.

[0016] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0017] 1. When using an injection molding machine equipped with the control device to inject molten material for injection molding, the speed adjustment mechanism can be used to adjust the material to different injection speeds, making the injection molding machine more suitable for injection molding of a variety of different products, improving the practicability of the device, reducing the production cost of the product, and being conducive to cost reduction and efficiency improvement;

[0018] 2. When the hydraulic cylinder needs to move quickly to a specified position, the first, second, and third solenoid valves and the pressure relief valve can be used to control the hydraulic cylinder to move quickly to the required preset position, thereby reducing the flow of hydraulic oil into the hydraulic cylinder, so that the hydraulic cylinder can move accurately to the preset position without losing pressure, so that the movement stroke of the hydraulic cylinder can be more accurately controlled, so that the device can move to the specified position quickly and accurately;

[0019] 3. The use of a hydraulic oil pump equipped with a servo motor can conveniently control the speed of the oil pump, and more conveniently adjust the pressure value of the hydraulic oil in the oil circuit. At the same time, the pressure value in the gas pressure storage tank can also be adjusted, so that the oil circuit pressure of the device and the pressure value in the speed control mechanism can be adjusted, further improving the practicability and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the hydraulic oil circuit structure of this application.

[0021] In the above drawings:

[0022] 1. Hydraulic oil tank;

[0023] 2. Hydraulic oil pump; 21. Oil pump; 22. Servo motor;

[0024] 3. Hydraulic cylinder;

[0025] 4. Hydraulic pipe;

[0026] 5. The first solenoid valve;

[0027] 6. Speed ​​control mechanism; 61. Second solenoid valve; 62. Gas pressure storage tank;

[0028] 7. Pressure relief valve;

[0029] 8. The third solenoid valve. DETAILED DESCRIPTION

[0030] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0031] A fast and precise control device for injection molding machines, referring to Figure 1 , including a hydraulic oil tank 1 for storing hydraulic oil, a hydraulic oil pump 2 for extracting hydraulic oil, and a hydraulic cylinder 3 for driving an injection molding machine for injection molding. A hydraulic pipe 4 for circulating hydraulic oil is connected between the hydraulic oil tank 1, the hydraulic oil pump 2, and the hydraulic oil cylinder 3. A first solenoid valve 5 for controlling the on-off of the oil circuit is arranged between the hydraulic oil pump 2 and the oil inlet of the hydraulic oil cylinder 3. A speed control mechanism 6 for adjusting the forward speed of the hydraulic oil cylinder 3 is also arranged between the hydraulic oil pump 2 and the oil inlet of the hydraulic oil cylinder 3.

[0032] The speed control mechanism 6 includes a second solenoid valve 61, which is arranged in parallel with the first solenoid valve 5. A gas pressure storage tank 62 is also connected to the second solenoid valve 61, and the gas pressure storage tank 62 is used to store hydraulic oil. Before the propulsion speed of the hydraulic cylinder 3 needs to be increased, the second solenoid valve 61 is opened in advance, the hydraulic oil is pressed into the gas pressure storage tank 62, and the second solenoid valve 61 is closed, so that the hydraulic oil can maintain a certain kinetic energy in the gas pressure storage tank 62. When the propulsion speed of the hydraulic cylinder 3 needs to be increased, the second solenoid valve 61 will be opened to release the hydraulic oil stored in the gas pressure storage tank 62, increase the kinetic energy in the hydraulic circuit, and enable the hydraulic cylinder 3 to be quickly propelled.

[0033] In order to facilitate the adjustment of the kinetic energy of the hydraulic oil pressed into the gas pressure storage tank 62, nitrogen is pre-installed in the gas pressure storage tank 62. Compared with control, nitrogen is more stable. After the gas is compressed, the kinetic energy obtained by the hydraulic oil is more stable, which makes it easier to adjust the pressure and flow in the hydraulic circuit.

[0034] A pressure relief valve 7 is provided between the oil outlet of the hydraulic cylinder 3 and the hydraulic oil tank 1, and a third solenoid valve 8 is provided between the oil inlet of the pressure relief valve 7 and the first solenoid valve 5, and the flow rate of the third solenoid valve 8 is smaller than the flow rate of the pressure relief valve 7. As required, the first solenoid valve 5, the second solenoid valve 61, the third solenoid valve 8 and the pressure relief valve 7 can all be solenoid valves purchased from the market or customized, or can be manufactured by selecting multi-position multi-pass solenoid valves and other controllable valves as required, and the corresponding valves are controlled by a computer, a PLC single chip microcomputer or other controllers with logical operation capabilities.

[0035] The hydraulic oil pump 2 includes an oil pump 21 and a servo motor 22 for driving the oil pump 21 to rotate. The servo motor 22 can be used to conveniently adjust the rotation speed of the oil pump 21, so that the pressure value and flow rate in the hydraulic oil circuit and the pressure of the hydraulic oil pressed into the gas pressure storage tank 62 can be regulated, making the device more practical and improving the reliability of the device.

[0036] The implementation principle of the fast and precise control device for an injection molding machine in the present application is as follows:

[0037] Standard mode: When the injection molding machine is required to perform push injection molding in the normal standard mode, the controller controls the first solenoid valve 5 and the third solenoid valve 8 to open, and the pressure relief valve 7 and the second solenoid valve 61 to close. The hydraulic circuit is controlled by the first solenoid valve 5 to enable the hydraulic cylinder 3 to be pushed at a normal speed, so that the injection molding machine can perform injection molding.

[0038] High-speed injection mode: the controller controls the first solenoid valve 5 to close in advance, and opens the second solenoid valve 61 at the same time, and the hydraulic oil pump 2 presses the hydraulic oil into the gas pressure storage tank 62, so that the pressed hydraulic oil obtains a certain kinetic energy, and closes the second solenoid valve 61 at the same time; when high-speed injection is required, the controller controls the hydraulic oil pump 2 to work normally, closes the third solenoid valve 8, opens the pressure relief valve 7, and opens the second solenoid valve 61 at the same time, so that the hydraulic oil pump 2 and the gas pressure storage tank 62 pump hydraulic oil to the hydraulic cylinder 3 at the same time, so that the hydraulic cylinder 3 can move quickly, so that the injection molding machine can inject the material at high speed.

[0039] High-speed and precise mode: Based on the high-speed injection mode, when the hydraulic cylinder 3 is about to move to the preset designated position, the controller controls the second solenoid valve 61 and the pressure relief valve 7 to close, and opens the third solenoid valve 8, so that the return oil of the hydraulic cylinder 3 passes through the third solenoid valve 8 and then flows back to the hydraulic oil tank 1, so that the speed of the hydraulic cylinder 3 can be reduced when it is about to reach the preset position, and it can move to the preset position more accurately.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A fast and precise control device for an injection molding machine, characterized in that: The invention comprises a hydraulic oil tank (1) for storing hydraulic oil, a hydraulic oil pump (2) for extracting hydraulic oil, and a hydraulic oil cylinder (3) for driving an injection molding machine to perform injection molding. A hydraulic pipe (4) for circulating hydraulic oil is connected between the hydraulic oil tank (1), the hydraulic oil pump (2), and the hydraulic oil cylinder (3). A first electromagnetic valve (5) for controlling the on-off of an oil circuit is provided between the hydraulic oil pump (2) and the oil inlet of the hydraulic oil cylinder (3). A speed control mechanism (6) for adjusting the forward speed of the hydraulic oil cylinder (3) is also provided between the hydraulic oil pump (2) and the oil inlet of the hydraulic oil cylinder (3).

2. A fast and precise control device for an injection molding machine according to claim 1, characterized in that: The speed control mechanism (6) comprises a second solenoid valve (61), the second solenoid valve (61) and the first solenoid valve (5) are arranged in parallel, and a gas pressure storage tank (62) is also connected to the second solenoid valve (61), and the gas pressure storage tank (62) is used to store hydraulic oil.

3. A fast and precise control device for an injection molding machine according to claim 2, characterized in that: The gas pressure storage tank (62) is filled with nitrogen.

4. A fast and precise control device for an injection molding machine according to claim 2, characterized in that: A pressure relief valve (7) is provided between the oil outlet of the hydraulic cylinder (3) and the hydraulic oil tank (1), and a third solenoid valve (8) is provided between the oil inlet of the pressure relief valve (7) and the first solenoid valve (5), wherein the flow rate of the third solenoid valve (8) is smaller than the flow rate of the pressure relief valve (7).

5. The rapid and precise control device for an injection molding machine according to claim 1, characterized in that: The hydraulic oil pump (2) comprises an oil pump (21) and a servo motor (22) for driving the oil pump to rotate.

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