A direct-pressure mold-opening hydraulic control system

Abstract

This invention belongs to the field of injection molding machine technology and provides a direct-pressure mold opening and closing hydraulic control system, which includes a direct-pressure cylinder, a first solenoid valve, a first check valve, and an oil tank. The direct-pressure cylinder outputs mold opening and closing forces. It includes a piston and a cylinder body, with the piston and cylinder body restricting the flow to the left chamber. A pressure sensor is installed in the direct-pressure cylinder. One end of the first solenoid valve is connected to the left chamber, and the other end is connected to the first check valve. The oil tank is connected to the first check valve. When the pressure value from the pressure sensor increases, it controls the opening of the first solenoid valve and the first check valve, allowing pressurized oil from the oil tank to enter the left chamber. This system enables smooth operation at low pressure and low speed, thus protecting the mold and preventing damage caused by excessively fast or high-pressure mold closing. It protects the mold and makes the system operate more smoothly.

Description

Technical Field

[0001] This invention belongs to the field of injection molding machine technology, and particularly relates to a direct pressure mold opening and closing hydraulic control system. Background Technology

[0002] Injection molding machines, also known as injection molding machines or injection molding machines, are the main molding equipment used to mold thermoplastic or thermosetting plastics into various shapes of plastic products using plastic molds. However, current injection molding machines are prone to hydraulic shocks and vibrations during the mold opening and closing process when providing mold opening and closing forces. This makes it impossible to perform smooth operation at low pressure and low speed, resulting in low control precision of mold opening and closing. This adversely affects product molding and also damages the mold, reducing its service life. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a direct pressure mold opening and locking hydraulic control system, which includes a direct pressure cylinder, a first solenoid valve, a first check valve and an oil tank.

[0004] The direct pressure cylinder is used to output mold opening force and mold closing force. The direct pressure cylinder includes a piston and a cylinder body. The piston and the cylinder body restrict the left cavity. The direct pressure cylinder is equipped with a pressure sensor.

[0005] One end of the first solenoid valve is connected to the left cavity and the other end is connected to the first check valve; the oil tank is connected to the first check valve.

[0006] When the pressure value of the pressure sensor increases, it controls the opening of the first solenoid valve and the first check valve, allowing the pressurized oil from the oil tank to enter the left chamber.

[0007] Preferably, the system further includes a rapid-acting hydraulic cylinder, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, and a fifth solenoid valve. The rapid-acting hydraulic cylinder has a rodless chamber and a rod chamber. The rapid-acting hydraulic cylinder is used to provide mold opening force and mold closing force. The rapid-acting hydraulic cylinder is connected to the direct-pressure hydraulic cylinder. The fifth solenoid valve is connected to the rodless chamber. The fourth solenoid valve is connected to the rod chamber. The second and third solenoid valves are sequentially connected to the fifth solenoid valve from the oil inlet end of the oil tank.

[0008] Preferably, there are two rapid hydraulic cylinders, the rodless chambers of the two rapid hydraulic cylinders are connected to the fifth solenoid valve, and the rod chambers of the two rapid hydraulic cylinders are connected to the fourth solenoid valve.

[0009] Preferably, the fifth solenoid valve is a one-way sequence valve.

[0010] Preferably, the system further includes a sixth solenoid valve, one end of which is connected to the oil tank and the other end of which is connected to the left cavity.

[0011] Preferably, the sixth solenoid valve is a one-way valve.

[0012] Preferably, the system further includes a seventh solenoid valve, which is connected to the oil tank.

[0013] Preferably, the oil tank is equipped with an oil pump, which provides driving force to the oil tank.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] A direct-pressure mold opening and closing hydraulic control system includes a direct-pressure cylinder, a first solenoid valve, a first check valve, and an oil tank. The direct-pressure cylinder is used to output mold opening force and mold closing force. The direct-pressure cylinder includes a piston and a cylinder body, with the piston and cylinder body restricting the flow to the left chamber. A pressure sensor is installed in the direct-pressure cylinder. One end of the first solenoid valve is connected to the left chamber, and the other end is connected to the first check valve. The oil tank is connected to the first check valve. When the pressure value of the pressure sensor increases, it controls the opening of the first solenoid valve and the first check valve, allowing pressurized oil from the oil tank to enter the left chamber. By setting a pressure sensor, when the piston encounters a load with high resistance, the system pressure increases, the pressure value of the pressure sensor increases, and the system transmits a signal to the first solenoid valve, causing the electromagnet YA5 of the first solenoid valve to be energized. The pressure oil in the oil tank enters the left chamber of the direct pressure cylinder from the branch line through the first check valve and the first solenoid valve, and the system switches to a slow mold closing state, which can improve the mold closing accuracy and achieve smooth operation under low pressure and low speed. This can protect the mold and avoid damage to the mold caused by excessive speed and pressure during mold closing. On the one hand, it protects the mold, and on the other hand, it makes the system operation more stable. Attached Figure Description

[0016] Figure 1 Schematic diagram of the direct pressure mold opening hydraulic control system provided by the present invention Figure 1 ;

[0017] Figure 2 Schematic diagram of the direct pressure mold opening hydraulic control system provided by the present invention Figure 2 ;

[0018] Figure 3 Schematic diagram of the direct pressure mold opening hydraulic control system provided by the present invention Figure 3 ;

[0019] Figure 4 Schematic diagram of the direct pressure mold opening hydraulic control system provided by the present invention Figure 4 .

[0020] Illustration:

[0021] 10. Direct-pressure cylinder; 11. Piston; 12. Left chamber; 13. Pressure sensor;

[0022] 20. First solenoid valve; 21. First check valve;

[0023] 30. Rapid-acting hydraulic cylinder; 31. Second solenoid valve; 32. Third solenoid valve; 33. Fourth solenoid valve; 34. Fifth solenoid valve; 35. Sixth solenoid valve; 36. Seventh solenoid valve; 37. Rodless chamber; 38. Rod chamber;

[0024] 40. Fuel tank. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Furthermore, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] See Figures 1-4 The present invention provides a direct pressure mold opening and locking hydraulic control system, which includes a direct pressure cylinder 10, a first solenoid valve 20, a first check valve 21 and an oil tank 40.

[0030] The direct-pressure cylinder 10 is used to output mold opening force and mold closing force. The direct-pressure cylinder 10 includes a piston 11 and a cylinder body. The piston 11 and cylinder body restrict the flow out of the left cavity 12. The direct-pressure cylinder 10 is equipped with a pressure sensor 13. One end of the first solenoid valve 20 is connected to the left cavity 12, and the other end is connected to a first check valve 21. The oil tank 40 is connected to the first check valve 21. When the pressure value of the pressure sensor 13 increases, it controls the opening of the first solenoid valve 20 and the first check valve 21, allowing pressurized oil from the oil tank 40 to enter the left cavity 12. The oil tank 40 is equipped with an oil pump, which provides driving force to the oil tank 40, and the oil tank 40 is used to store pressurized oil.

[0031] By setting pressure sensor 13, when piston 11 encounters a load with high resistance, the system pressure increases, the pressure value of pressure sensor 13 increases, and the system transmits a signal to the first solenoid valve 20, which energizes the electromagnet YA5 of the first solenoid valve 20. The pressure oil from oil tank 40 enters the left chamber 12 of direct pressure cylinder 10 from the branch line through the first one-way valve 21 and the first solenoid valve 20. The system switches to a slow mold closing state, which can improve the mold closing accuracy and achieve smooth operation under low pressure and low speed. This can protect the mold and avoid damage to the mold caused by excessive speed and pressure during mold closing. On the one hand, it protects the mold, and on the other hand, it makes the system run more smoothly.

[0032] The direct pressure mold opening hydraulic control system also includes a rapid oil cylinder 30, a second solenoid valve 31, a third solenoid valve 32, a fourth solenoid valve 33, a fifth solenoid valve 34, a sixth solenoid valve 35, and a seventh solenoid valve 36.

[0033] The rapid hydraulic cylinder 30 is provided with a rodless chamber 37 and a rod chamber 38. The rapid hydraulic cylinder 30 is used to provide mold opening force and mold closing force. The rapid hydraulic cylinder 30 is connected to the direct pressure cylinder 10. There can be two rapid hydraulic cylinders 30, which are respectively placed on both sides of the direct pressure cylinder 10. The rodless chambers 37 of the two rapid hydraulic cylinders 30 are connected to the fifth solenoid valve 34, and the rod chambers 38 of the two rapid hydraulic cylinders 30 are connected to the fourth solenoid valve 33.

[0034] The second solenoid valve 31 and the third solenoid valve 32 are sequentially connected from the oil inlet end of the oil tank 40 to the fifth solenoid valve 34. One end of the sixth solenoid valve 35 is connected to the oil tank 40, and the other end is connected to the left chamber 12. Furthermore, the sixth solenoid valve 35 can be a one-way valve, and the fifth solenoid valve 34 can be a one-way sequence valve. The seventh solenoid valve 36 is connected to the oil tank 40.

[0035] When performing rapid mold clamping, see Figure 1When the oil pump starts, the electromagnets YA2 of the second solenoid valve 31 and YA3 of the third solenoid valve 32 are energized. Pressure oil from the oil tank 40 enters the rodless chambers 37 of the two rapid-action cylinders 30 via the fifth solenoid valve 34, driving the pistons 11 of the rapid-action cylinders 30. Simultaneously, the electromagnet YA4 of the fourth solenoid valve 33 is energized, merging the pressure oil from the rod chamber 38 into the rodless chamber 37, enabling the rapid-action cylinders 30 to complete the rapid mold-locking action. At the same time, a vacuum is created in the left chamber 12 of the direct-pressure cylinder 10. Since the sixth solenoid valve 35 is a one-way valve, it draws pressure oil from the oil tank 40 and transfers it to the left chamber 12 to replenish the pressure, preventing hydraulic shock and vibration in the system.

[0036] When performing slow mold clamping, see Figure 2 When the oil pump starts, the piston 11 of the direct pressure cylinder 10 encounters a load with high resistance, the system pressure increases, the pressure value of the pressure sensor 13 increases, and the system transmits a signal to the first solenoid valve 20, which energizes the electromagnet YA5 of the first solenoid valve 20. The pressure oil from the oil tank 40 enters the left chamber 12 of the direct pressure cylinder 10 from the branch line through the first check valve 21 and the first solenoid valve 20, and the system switches from the fast mold-locking state to the slow mold-closing state.

[0037] When performing slow pressure release and mold opening, see Figure 3 When the oil pump starts, the electromagnet YA5 of the first solenoid valve 20 is de-energized, and the pressure oil in the left chamber 12 of the direct pressure cylinder 10 is depressurized through the first solenoid valve 20, which can realize slow depressurization and mold opening.

[0038] When performing rapid pressure release and mold opening, see Figure 4 The pressure oil in the left chamber 12 of the direct pressure cylinder 10 is depressurized through the first solenoid valve 20. At the same time, the solenoid YA1 of the second solenoid valve 31 and the solenoid YA6 of the seventh solenoid valve 36 are energized. The pressure oil enters the rod chamber 38 of the rapid cylinder 30 through the second solenoid valve 31 and the fourth solenoid valve 33. On the other hand, since the fifth solenoid valve 34 can be a one-way sequence valve, when the pressure in the rodless chamber 37 is greater than the set value, the fifth solenoid valve 34 opens, and the pressure oil in the rodless chamber 37 flows back to the oil tank 40 through the seventh solenoid valve 36 and the fifth solenoid valve 34, realizing rapid pressure relief and mold opening.

[0039] The direct pressure mold opening and closing hydraulic control system provided in this application can provide multiple control modes such as fast mold closing, slow mold closing, and slow pressure release mold opening when locking and opening the mold. This improves the mold opening and closing accuracy of the direct pressure mold opening and closing hydraulic control system, thereby improving product production efficiency and product quality, reducing the occurrence of failures, protecting the mold, and extending the service life of the injection molding machine.

[0040] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A direct-pressure mold-opening hydraulic control system, comprising a direct-pressure cylinder, a first solenoid valve, a first check valve, and an oil tank, characterized in that: The direct pressure cylinder is used to output mold opening force and mold closing force. The direct pressure cylinder includes a piston and a cylinder body. The piston and the cylinder body restrict the left cavity. The direct pressure cylinder is equipped with a pressure sensor. One end of the first solenoid valve is connected to the left cavity and the other end is connected to the first check valve; the oil tank is connected to the first check valve. When the pressure value of the pressure sensor increases, it controls the opening of the first solenoid valve and the first check valve, allowing the pressurized oil from the oil tank to enter the left chamber. It also includes a rapid hydraulic cylinder and a second solenoid valve, a third solenoid valve, a fourth solenoid valve and a fifth solenoid valve. The rapid hydraulic cylinder is provided with a rodless chamber and a rod chamber. The rapid hydraulic cylinder is used to provide mold opening force and mold closing force. The rapid hydraulic cylinder is connected to the direct pressure cylinder. The fifth solenoid valve is connected to the rodless chamber. The fourth solenoid valve is connected to the rod chamber. The second solenoid valve and the third solenoid valve are connected to the fifth solenoid valve in sequence from the oil inlet end of the oil tank. The rapid hydraulic cylinder is configured as two cylinders, the rodless chambers of the two cylinders are connected to the fifth solenoid valve, and the rod chambers of the two cylinders are connected to the fourth solenoid valve. It also includes a sixth solenoid valve, one end of which is connected to the oil tank and the other end of which is connected to the left cavity.

2. The direct-pressure mold-opening hydraulic control system as described in claim 1, characterized in that: The fifth solenoid valve is a one-way sequence valve.

3. The direct-pressure mold-opening hydraulic control system as described in claim 1, characterized in that: The sixth solenoid valve is a one-way valve.

4. The direct-pressure mold-opening hydraulic control system as described in claim 1, characterized in that: It also includes a seventh solenoid valve, which is connected to the oil tank.

5. The direct-pressure mold-opening hydraulic control system as described in claim 1, characterized in that: The oil tank is equipped with an oil pump, which is used to provide driving force to the oil tank.

Images