An improved hydraulic system applied to a full-automatic molding machine

Abstract

The utility model discloses an improved hydraulic system applied to full -automatic molding machine, first power group includes first servo motor, first servo pump, first oil suction filter, first servo motor is connected and controls the operation of first servo pump, and one end of first servo pump is communicated to the oil tank through main oil circuit no.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical hydraulic systems, and particularly relates to an improved hydraulic system for use in fully automatic molding machines, including an oil tank, an air filter, a heater, a temperature sensor, a level gauge, a first oil suction filter, and a second oil suction filter. Background Technology

[0002] Currently, existing molding machines mainly use a single set of motor pumps as the power unit in practical applications. However, due to the diverse movements of the molding machine and the large number of hydraulic cylinders used in the entire molding process, using a single set of motor pumps as the power unit results in each process being operated separately. This situation leads to the molding machine having a long working cycle and slow molding efficiency, especially for large molding machines. Summary of the Invention

[0003] To overcome the above-mentioned deficiencies, this utility model provides an improved hydraulic system for a fully automatic molding machine. This hydraulic system adopts dual servo power drive, enabling multiple cylinders to achieve simultaneous or rapid action, thus giving the molding machine the characteristics of short working cycle and fast molding efficiency.

[0004] To achieve a short working cycle and fast molding efficiency, this utility model adopts the following specific technical measures: An improved hydraulic system for a fully automatic molding machine, comprising an oil tank, an air filter, a heater, a temperature sensor, a level gauge, a first oil suction filter, and a second oil suction filter. The oil tank is equipped with an air filter, a heater, a temperature sensor, and a level gauge. The system is characterized by further comprising a first power unit, a second power unit, a first check valve, a second check valve, a first relief valve, a second relief valve, a third relief valve, a first electromagnetic directional valve, a second electromagnetic directional valve, a third electromagnetic directional valve, a fourth electromagnetic directional valve, a fifth electromagnetic directional valve, a differential valve, a first counterbalancing valve, a second counterbalancing valve, a first differential valve group, a second differential valve group, a hydraulic control valve, a first mold closing cylinder, a second mold closing cylinder, an upper mold cylinder, a lower mold cylinder, a sliding cylinder, and a middle frame cylinder. The first power unit includes a first servo motor, a first servo pump, and a first oil suction filter. The first servo motor is connected to and controls the operation of the first servo pump. One end of the first servo pump is connected to the oil tank through the first main oil circuit. The first oil suction filter is installed in the first main oil circuit. The other end of the first servo pump is connected to the first branch oil circuit group through the second main oil circuit. The second main oil circuit is equipped with a first check valve.

[0005] The first branch oil circuit group includes branch oil circuit one, branch oil circuit two, and branch oil circuit three. One end of branch oil circuit one is connected to main oil circuit two, and the other end of branch oil circuit one is connected to the first oil port of the first solenoid directional valve. One end of branch oil circuit two is connected to main oil circuit two, and the other end of branch oil circuit two is connected to the first oil port of the differential valve. One end of branch oil circuit three is connected to main oil circuit two, and the other end of branch oil circuit three is connected to the first oil port of the second solenoid directional valve.

[0006] The second port of the first electromagnetic directional valve is connected to the second port of the differential valve through oil circuit one. The first port of the first mold closing cylinder and the first port of the second mold closing cylinder are respectively connected to the third port of the differential valve through oil circuit two. The second ports of the first mold closing cylinder and the second port of the second mold closing cylinder are interconnected through oil circuit three. The third port of the first mold closing cylinder or the second mold closing cylinder is connected to the third port of the first electromagnetic directional valve through oil circuit four. The fourth port of the differential valve is connected to oil circuit four through oil circuit five. Oil circuit five is equipped with a second check valve. The fourth port of the first electromagnetic directional valve is connected to the main return oil circuit.

[0007] The differential valve achieves rapid action of the first and second mold closing cylinders through the control of the first solenoid directional valve.

[0008] The second port of the second solenoid directional valve is connected to the first port of the upper tank cylinder through oil circuit six. The second port of the upper tank cylinder is connected to the third port of the second solenoid directional valve through oil circuit seven. A first counterbalancing valve is installed between oil circuit six and oil circuit seven. The fourth port of the second solenoid directional valve is connected to the main return oil circuit. The first port of the first differential valve group is connected to oil circuit six. The second port of the first differential valve group is connected to oil circuit seven. The third port of the first differential valve group is connected to the main return oil circuit.

[0009] The second power unit includes a second servo motor, a second servo pump, and a second suction filter. The second servo motor is connected to and controls the operation of the second servo pump. One end of the second servo pump is connected to the oil tank through the main oil circuit three. The second suction filter is installed in the main oil circuit three. The other end of the second servo pump is connected to the second branch oil circuit group through the main oil circuit four.

[0010] The second branch oil circuit group includes branch oil circuit four, branch oil circuit five, and branch oil circuit six. One end of branch oil circuit four is connected to main oil circuit four, and the other end of branch oil circuit four is connected to the first oil port of the third solenoid directional valve. One end of branch oil circuit five is connected to main oil circuit four, and the other end of branch oil circuit five is connected to the first oil port of the fourth solenoid directional valve. One end of branch oil circuit six is ​​connected to main oil circuit four, and the other end of branch oil circuit six is ​​connected to the first oil port of the fifth solenoid directional valve.

[0011] The second port of the third solenoid directional valve is connected to the first port of the lower tank cylinder through oil circuit eight. The second port of the lower tank cylinder is connected to the third port of the third solenoid directional valve through oil circuit nine. The fourth port of the third solenoid directional valve is connected to the main return oil circuit. A second counterbalancing valve is installed between oil circuit eight and oil circuit nine. The first port of the second differential valve group is connected to oil circuit eight. The second port of the second differential valve group is connected to oil circuit nine. The third port of the second differential valve group is connected to the main return oil circuit.

[0012] The second oil port of the fourth solenoid directional valve is connected to the first oil port of the hydraulic control valve through oil circuit ten. The second oil port of the hydraulic control valve is connected to the first oil port of the sliding cylinder through oil circuit eleven. The second oil port of the sliding cylinder is connected to the third oil port of the hydraulic control valve through oil circuit twelve. The fourth oil port of the hydraulic control valve is connected to the third oil port of the fourth solenoid directional valve through oil circuit thirteen. The fourth oil port of the fourth solenoid directional valve is connected to the main return oil circuit.

[0013] The second oil port of the fifth solenoid directional valve is connected to the first oil port of the middle frame cylinder through oil circuit fourteen. The second oil port of the middle frame cylinder is connected to the third oil port of the fifth solenoid directional valve through oil circuit fifteen. The fourth oil port of the fifth solenoid directional valve is connected to the main return oil circuit.

[0014] A first relief valve and a second relief valve are installed between the main oil circuit 2 and the main return oil circuit.

[0015] A third relief valve is installed between the main oil circuit 4 and the main return oil circuit.

[0016] The first relief valve, the second relief valve, and the third relief valve can protect the hydraulic system by limiting the maximum pressure of the hydraulic system.

[0017] The outlet of the main return oil circuit is connected to the oil tank.

[0018] The first servo motor controls the operation of the first servo pump, and the second servo motor controls the operation of the second servo pump. The hydraulic oil is drawn through the first and second suction filters into the circuit composed of the main oil circuits, the first branch oil circuit group, the second branch oil circuit group, the main return oil circuit, and the various oil circuits, and the hydraulic system starts to work.

[0019] When the first, second, third, fourth, and fifth electromagnetic directional valves are energized, they can control the movement direction of the first mold closing cylinder, the second mold closing cylinder, the upper box cylinder, the lower box cylinder, the sliding cylinder, and the middle frame cylinder.

[0020] The hydraulic circuit has a pressure-maintaining function after the first servo motor and the second servo motor stop.

[0021] This utility model has the following advantages: (1) The first servo pump and the second servo pump are used as a double pump to provide pressure and flow settings for the hydraulic system, which effectively improves the pressure stability and operating accuracy of the hydraulic system.

[0022] (2) The first counterbalance valve and the second counterbalance valve are used to provide pressure to the hydraulic system, making the operation of the hydraulic system more stable, safe and reliable.

[0023] (3) A differential valve is used to enable the first mold closing cylinder and the second mold closing cylinder to move quickly, so that the hydraulic system runs smoothly.

[0024] The beneficial technical effect of this utility model is that the hydraulic system adopts the first power group and the second power group as dual servo power drive, which makes the molding machine have the characteristics of short working cycle and fast molding efficiency. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a schematic diagram of the overall assembly and connection structure of this utility model.

[0027] In the diagram: 1-oil tank, 2-air filter, 3-heater, 4-temperature sensor, 5-level gauge, 6-first oil suction filter, 7-first servo motor, 8-first servo pump, 9-second oil suction filter, 10-second servo pump, 11-second servo motor, 12-first overflow valve, 13-second overflow valve, 14-first check valve, 15-third overflow valve, 16-first solenoid directional valve, 17-differential valve, 18-second check valve, 19- 20-Second solenoid directional valve, 21-First counterbalance valve, 22-First differential valve group, 23-Third solenoid directional valve, 24-Second differential valve group, 25-Fourth solenoid directional valve, 26-Hydraulic control valve, 27-Fifth solenoid directional valve, 281-First mold closing cylinder, 282-Second mold closing cylinder, 29-Upper box cylinder, 30-Lower box cylinder, 31-Sliding cylinder, 32-Middle frame cylinder, B1-Spare servo pump, B2-Spare suction filter. Detailed Implementation

[0028] like Figure 1As shown, an improved hydraulic system for a fully automatic molding machine includes an oil tank 1, an air filter 2, a heater 3, a temperature sensor 4, a level gauge 5, a first suction filter 6, and a second suction filter 9. The oil tank 1 is equipped with the air filter 2, heater 3, temperature sensor 4, and level gauge 5. The system is characterized by further including a first power unit, a second power unit, a first check valve 14, a second check valve 18, a first relief valve 12, a second relief valve 13, a third relief valve 15, a first solenoid directional valve 16, a second solenoid directional valve 19, a third solenoid directional valve 22, a fourth solenoid directional valve 25, a fifth solenoid directional valve 27, a differential valve 17, a first counterbalancing valve 20, a second counterbalancing valve 23, a first differential valve group 21, a second differential valve group 24, a hydraulic control valve 26, a first mold closing cylinder 281, a second mold closing cylinder 282, an upper mold cylinder 29, a lower mold cylinder 30, a sliding cylinder 31, and a middle frame cylinder 32. The first power unit includes a first servo motor 7, a first servo pump 8, and a first oil suction filter 6. The first servo motor 7 is connected to and controls the operation of the first servo pump 8. One end of the first servo pump 8 is connected to the oil tank 1 through the first main oil circuit. The first oil suction filter 6 is installed in the first main oil circuit. The other end of the first servo pump 8 is connected to the first branch oil circuit group through the second main oil circuit. The second main oil circuit is equipped with a first check valve 14.

[0029] The first branch oil circuit group includes branch oil circuit one, branch oil circuit two, and branch oil circuit three. One end of branch oil circuit one is connected to the main oil circuit two, and the other end of branch oil circuit one is connected to the first oil port of the first solenoid directional valve 16. One end of branch oil circuit two is connected to the main oil circuit two, and the other end of branch oil circuit two is connected to the first oil port of the differential valve 17. One end of branch oil circuit three is connected to the main oil circuit two, and the other end of branch oil circuit three is connected to the first oil port of the second solenoid directional valve 19.

[0030] The second oil port of the first electromagnetic directional valve 16 is connected to the second oil port of the differential valve 17 through oil circuit one. The first oil port of the first mold closing cylinder 281 and the first oil port of the second mold closing cylinder 282 are respectively connected to the third oil port of the differential valve 17 through oil circuit two. The second oil ports of the first mold closing cylinder 281 and the second oil ports of the second mold closing cylinder 282 are connected to each other through oil circuit three. The third oil port of the second mold closing cylinder 282 is connected to the third oil port of the first electromagnetic directional valve 16 through oil circuit four. The fourth oil port of the differential valve 17 is connected to oil circuit four through oil circuit five. A second check valve 18 is installed in oil circuit five. The fourth oil port of the first electromagnetic directional valve 16 is connected to the main return oil circuit.

[0031] The second port of the second electromagnetic directional valve 19 is connected to the first port of the upper tank cylinder 29 via oil circuit six. The second port of the upper tank cylinder 29 is connected to the third port of the second electromagnetic directional valve 19 via oil circuit seven. A first counterbalancing valve 20 is installed between oil circuit six and oil circuit seven. The fourth port of the second electromagnetic directional valve 19 is connected to the main return oil circuit. The first port of the first differential valve group 21 is connected to oil circuit six. The second port of the first differential valve group 21 is connected to oil circuit seven. The third port of the first differential valve group 21 is connected to the main return oil circuit.

[0032] The second power unit includes a second servo motor 11, a second servo pump 10, and a second oil suction filter 9. The second servo motor 11 is connected to and controls the operation of the second servo pump 10. One end of the second servo pump 10 is connected to the oil tank 1 through the main oil circuit three. The second oil suction filter 9 is installed in the main oil circuit three. The other end of the second servo pump 10 is connected to the second branch oil circuit group through the main oil circuit four.

[0033] The second branch oil circuit group includes branch oil circuit four, branch oil circuit five, and branch oil circuit six. One end of branch oil circuit four is connected to the main oil circuit four, and the other end of branch oil circuit four is connected to the first oil port of the third solenoid directional valve 22. One end of branch oil circuit five is connected to the main oil circuit four, and the other end of branch oil circuit five is connected to the first oil port of the fourth solenoid directional valve 25. One end of branch oil circuit six is ​​connected to the main oil circuit four, and the other end of branch oil circuit six is ​​connected to the first oil port of the fifth solenoid directional valve 27.

[0034] The second port of the third solenoid directional valve 22 is connected to the first port of the lower tank cylinder 30 through oil circuit eight. The second port of the lower tank cylinder 30 is connected to the third port of the third solenoid directional valve 22 through oil circuit nine. The fourth port of the third solenoid directional valve 22 is connected to the main return oil circuit. A second counterbalancing valve 23 is installed between oil circuit eight and oil circuit nine. The first port of the second differential valve group 24 is connected to oil circuit eight. The second port of the second differential valve group 24 is connected to oil circuit nine. The third port of the second differential valve group 24 is connected to the main return oil circuit.

[0035] The second oil port of the fourth solenoid directional valve 25 is connected to the first oil port of the hydraulic control valve 26 through oil circuit ten. The second oil port of the hydraulic control valve 26 is connected to the first oil port of the sliding cylinder 31 through oil circuit eleven. The second oil port of the sliding cylinder 31 is connected to the third oil port of the hydraulic control valve 26 through oil circuit twelve. The fourth oil port of the hydraulic control valve 26 is connected to the third oil port of the fourth solenoid directional valve 25 through oil circuit thirteen. The fourth oil port of the fourth solenoid directional valve 25 is connected to the main return oil circuit.

[0036] The second oil port of the fifth solenoid directional valve 27 is connected to the first oil port of the middle frame cylinder 32 through oil passage fourteen. The second oil port of the middle frame cylinder 32 is connected to the third oil port of the fifth solenoid directional valve 27 through oil passage fifteen. The fourth oil port of the fifth solenoid directional valve 27 is connected to the main return oil passage.

[0037] A first relief valve 12 and a second relief valve 13 are installed between the main oil circuit 2 and the main return oil circuit.

[0038] The first relief valve 12 and the second relief valve 13 are connected in parallel between the main oil circuit 2 and the main return oil circuit.

[0039] A third relief valve 15 is installed between the main oil circuit 4 and the main return oil circuit.

[0040] The outlet of the main return oil circuit is connected to oil tank 1.

[0041] like Figure 1 As shown, it also includes a backup power unit, which consists of a backup servo pump B1 and a backup oil suction filter B2. One end of the backup servo pump B1 is connected to the oil tank 1 through a backup main oil circuit. The backup main oil circuit is equipped with a backup oil suction filter B2. The other end of the backup servo pump B1 is connected to the first branch oil circuit group through a backup main oil circuit. The first servo motor 7 can connect to and control the operation of the backup servo pump B1.

[0042] The first differential valve group 21 and the second differential valve group 24 specifically include: an interconnecting valve, a pressure regulating valve, and a check valve.

[0043] The power of the first servo motor 7 and the second servo motor 11 in this utility model is specifically 31KW + 11KW. The voltage level of the first servo motor 7 and the second servo motor 11 is specifically 380V / 50HZ. The displacement of the first servo pump 8 and the second servo pump 10 is specifically 100L / MIN + 40L / MIN. The volume of the oil tank 1 is specifically 800L. The voltage level of the first solenoid directional valve 16, the second solenoid directional valve 19, the third solenoid directional valve 22, the fourth solenoid directional valve 25, and the fifth solenoid directional valve 27 is specifically DC24V.

Claims

1. An improved hydraulic system for a fully automatic molding machine, comprising an oil tank, an air filter, a heater, a temperature sensor, a level gauge, a first suction filter, and a second suction filter, wherein the oil tank is respectively equipped with an air filter, a heater, a temperature sensor, and a level gauge, characterized in that, It also includes a first power unit, a second power unit, a first check valve, a second check valve, a first relief valve, a second relief valve, a third relief valve, a first solenoid directional valve, a second solenoid directional valve, a third solenoid directional valve, a fourth solenoid directional valve, a fifth solenoid directional valve, a differential valve, a first counterbalancing valve, a second counterbalancing valve, a first differential valve group, a second differential valve group, a hydraulic control valve, a first mold closing cylinder, a second mold closing cylinder, an upper mold cylinder, a lower mold cylinder, a sliding cylinder, and a middle frame cylinder. The first power unit includes a first servo motor, a first servo pump, and a first oil suction filter. The first servo motor is connected to and controls the operation of the first servo pump. One end of the first servo pump is connected to the oil tank through the first main oil circuit. The first oil suction filter is installed in the first main oil circuit. The other end of the first servo pump is connected to the first branch oil circuit group through the second main oil circuit. The second main oil circuit is equipped with a first check valve. The first branch oil circuit group includes branch oil circuit one, branch oil circuit two, and branch oil circuit three. One end of branch oil circuit one is connected to the main oil circuit two, and the other end of branch oil circuit one is connected to the first oil port of the first solenoid directional valve. One end of branch oil circuit two is connected to the main oil circuit two, and the other end of branch oil circuit two is connected to the first oil port of the differential valve. One end of branch oil circuit three is connected to the main oil circuit two, and the other end of branch oil circuit three is connected to the first oil port of the second solenoid directional valve. The second oil port of the first electromagnetic reversing valve is connected to the second oil port of the differential valve through oil circuit one. The first oil port of the first mold closing cylinder and the first oil port of the second mold closing cylinder are respectively connected to the third oil port of the differential valve through oil circuit two. The second oil port of the first mold closing cylinder and the second oil port of the second mold closing cylinder are connected to each other through oil circuit three. The third oil port of the first mold closing cylinder or the second mold closing cylinder is connected to the third oil port of the first electromagnetic reversing valve through oil circuit four. The fourth oil port of the differential valve is connected to oil circuit four through oil circuit five. Oil circuit five is equipped with a second check valve. The fourth oil port of the first electromagnetic reversing valve is connected to the main return oil circuit. The second oil port of the second solenoid directional valve is connected to the first oil port of the upper tank cylinder through oil circuit six. The second oil port of the upper tank cylinder is connected to the third oil port of the second solenoid directional valve through oil circuit seven. A first counterbalancing valve is installed between oil circuit six and oil circuit seven. The fourth oil port of the second solenoid directional valve is connected to the main return oil circuit. The first oil port of the first differential valve group is connected to oil circuit six. The second oil port of the first differential valve group is connected to oil circuit seven. The third oil port of the first differential valve group is connected to the main return oil circuit. The second power unit includes a second servo motor, a second servo pump, and a second oil suction filter. The second servo motor is connected to and controls the operation of the second servo pump. One end of the second servo pump is connected to the oil tank through the main oil circuit three. The second oil suction filter is installed in the main oil circuit three. The other end of the second servo pump is connected to the second branch oil circuit group through the main oil circuit four. The second branch oil circuit group includes branch oil circuit four, branch oil circuit five, and branch oil circuit six. One end of branch oil circuit four is connected to the main oil circuit four, and the other end of branch oil circuit four is connected to the first oil port of the third solenoid directional valve. One end of branch oil circuit five is connected to the main oil circuit four, and the other end of branch oil circuit five is connected to the first oil port of the fourth solenoid directional valve. One end of branch oil circuit six is ​​connected to the main oil circuit four, and the other end of branch oil circuit six is ​​connected to the first oil port of the fifth solenoid directional valve. The second oil port of the third solenoid directional valve is connected to the first oil port of the lower tank cylinder through oil circuit eight. The second oil port of the lower tank cylinder is connected to the third oil port of the third solenoid directional valve through oil circuit nine. The fourth oil port of the third solenoid directional valve is connected to the main return oil circuit. A second counterbalancing valve is installed between oil circuit eight and oil circuit nine. The first oil port of the second differential valve group is connected to oil circuit eight. The second oil port of the second differential valve group is connected to oil circuit nine. The third oil port of the second differential valve group is connected to the main return oil circuit. The second oil port of the fourth solenoid directional valve is connected to the first oil port of the hydraulic control valve through oil circuit ten. The second oil port of the hydraulic control valve is connected to the first oil port of the sliding cylinder through oil circuit eleven. The second oil port of the sliding cylinder is connected to the third oil port of the hydraulic control valve through oil circuit twelve. The fourth oil port of the hydraulic control valve is connected to the third oil port of the fourth solenoid directional valve through oil circuit thirteen. The fourth oil port of the fourth solenoid directional valve is connected to the main return oil circuit. The second oil port of the fifth solenoid directional valve is connected to the first oil port of the middle frame cylinder through oil circuit fourteen. The second oil port of the middle frame cylinder is connected to the third oil port of the fifth solenoid directional valve through oil circuit fifteen. The fourth oil port of the fifth solenoid directional valve is connected to the main return oil circuit. A first relief valve and a second relief valve are installed between the main oil circuit 2 and the main return oil circuit; A third relief valve is installed between the main oil circuit 4 and the main return oil circuit; The outlet of the main return oil circuit is connected to the oil tank.

2. The improved hydraulic system for a fully automatic molding machine according to claim 1, characterized in that, The first relief valve and the second relief valve are connected in parallel between the main oil circuit 2 and the main return oil circuit.

3. The improved hydraulic system for a fully automatic molding machine according to claim 1, characterized in that, It also includes a backup power unit, which consists of a backup servo pump and a backup suction filter. One end of the backup servo pump is connected to the oil tank through a backup main oil circuit. A backup suction filter is installed in the backup main oil circuit. The other end of the backup servo pump is connected to the first branch oil circuit group through a backup main oil circuit. The first servo motor can connect to and control the operation of the backup servo pump.

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