CN111255754A - Punching machine hydraulic system - Google Patents

Abstract

The invention relates to a hydraulic system of a punching machine, comprising: the method comprises the following steps: the hydraulic control system comprises a main hydraulic cylinder, an ejection plunger cylinder, a plurality of blank pressing plunger cylinders, a main oil tank, a high-position oil tank, a two-position two-way electromagnetic reversing valve, a three-position four-way electro-hydraulic reversing valve, an electromagnetic reversing valve, a first electro-hydraulic reversing valve, a second electro-hydraulic reversing valve and an electromagnetic overflow valve. All the components are connected by hydraulic rubber pipes, and pipe joints and buckling joints of different types are adopted according to different types of components. The mold is arranged on the ejection plunger cylinder, and the ejection plunger cylinder ejects the workpiece after punch forming. The blank pressing plunger cylinder is used for pressing a workpiece in the stamping process. The blank pressing plunger cylinder, the ejection plunger cylinder and the main hydraulic cylinder are rigidly connected through a mechanical structure, the ejection of the piston rod is close to high-pressure oil, and the retraction of the piston rod is close to the driving of the main hydraulic cylinder.

Description

A hydraulic system of a punching machine

technical field

The invention belongs to the technical field of punching machines, and relates to a hydraulic system of a punching machine.

Background technique

The hydraulic system of the punch press is composed of a plurality of hydraulic components to form a hydraulic system circuit to realize the expansion and contraction of the oil cylinder. The existing punching machine system has problems such as low oil suction efficiency of hydraulic pump, high system failure rate, and less protection measures in emergencies such as sudden power failure.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the purpose of the present invention is to provide a hydraulic system of a punching machine, which can improve the safety and reliability of the product, reduce the product cost, reduce the waste of resources, and improve the work efficiency.

The invention provides a hydraulic system of a punching machine, comprising: a main hydraulic cylinder, an ejector plunger cylinder, a plurality of blank holder plunger cylinders, a main oil tank, a high-level oil tank, a two-position two-way electromagnetic reversing valve, a three-position four-way electro-hydraulic reversing valve, electromagnetic reversing valve, first electro-hydraulic reversing valve, second electro-hydraulic reversing valve and electromagnetic relief valve; the main oil tank is connected to the first one-way valve through a variable pump, and the first one-way The valves are respectively connected to the oil inlet of the three-position four-way electro-hydraulic reversing valve, the oil inlet of the first electro-hydraulic reversing valve and the oil inlet of the second electro-hydraulic reversing valve. The three-position four-way electro-hydraulic reversing valve The first working port of the main hydraulic cylinder is connected to the rodless cavity of the main hydraulic cylinder through the second one-way valve, and the rod cavity of the main hydraulic cylinder is connected to the second working port of the three-position four-way electro-hydraulic reversing valve, and the three-position four-way electro-hydraulic reversing valve The oil return port is connected to a two-position, two-way electromagnetic reversing valve, and the two-position, two-way electromagnetic reversing valve is respectively connected to the cooler and the oil discharge port of the first electro-hydraulic reversing valve, and the cooler is connected to the main valve through a filter. an oil tank; the oil outlet of the first electro-hydraulic reversing valve is connected to an electromagnetic reversing valve, and the electromagnetic reversing valve is connected to the ejector plunger cylinder; the oil outlet of the second electro-hydraulic reversing valve passes through a plurality of hydraulic The control check valve is connected to the corresponding blank holder plunger cylinder, the high-level oil tank is also connected to the corresponding blank holder plunger cylinder through the hydraulic control check valve, and the oil return port of the second electro-hydraulic reversing valve is connected to the main fuel tank; The first working port of the electromagnetic relief valve is connected to the oil outlet of the variable pump, and the second working port of the electromagnetic relief valve is connected to the main oil tank; the pipe connecting the first one-way valve and the three-position four-way electro-hydraulic reversing valve There are accumulators on the road.

In the hydraulic system of the punch press of the present invention, the system includes four blank holder plunger cylinders, each of which is correspondingly connected to the oil inlet of a direct-acting relief valve. The oil drain port is connected to the main oil tank.

In the hydraulic system of the punching machine of the present invention, the hydraulic system of the punching machine is further provided with an air filter and a liquid level and liquid temperature display which are respectively connected with the main oil tank.

In the hydraulic system of the punching machine of the present invention, a pressure gauge is provided on the pipeline connecting the first one-way valve and the three-position four-way electro-hydraulic reversing valve.

In the hydraulic system of the punch press of the present invention, a throttle valve is provided between the oil return port of the three-position four-way electro-hydraulic reversing valve and the oil discharge port of the first electro-hydraulic reversing valve.

In the hydraulic system of the punch press of the present invention, a pilot-operated relief valve is provided on the pipeline connecting the first electro-hydraulic reversing valve and the ejector plunger cylinder, and the oil inlet of the pilot-operated relief valve is connected to the ejector. Out of the plunger cylinder, the oil outlet of the pilot relief valve is connected to the oil outlet of the first electro-hydraulic reversing valve.

The hydraulic system of the punching machine of the invention can improve the safety and reliability of the product, reduce the cost of the product, reduce the waste of resources and improve the work efficiency.

Description of drawings

Fig. 1 is the schematic diagram of a kind of hydraulic system of punching machine of the present invention;

In the picture: 1-filter; 2-variable pump; 3-electromagnetic relief valve; 4-first check valve; 5-accumulator; 6-pressure gauge switch; 7-pressure gauge; 8-throttle valve ;9-two-position two-barrel electromagnetic reversing valve;10-three-position four-way electro-hydraulic reversing valve;11-second one-way valve;12-pressure relay;13.second electro-hydraulic reversing valve;14～18- Hydraulic control check valve; 19-high oil tank; 20-23 blank holder plunger cylinder; 24-27 direct-acting relief valve; 28-main hydraulic cylinder; 29- ejector plunger cylinder; 30-pilot-operated overflow valve; 31-electromagnetic reversing valve; 32-first electro-hydraulic reversing valve; 33-cooler; 34-air filter; 35-liquid level liquid temperature display.

Detailed ways

As shown in FIG. 1, a hydraulic system of a punching machine of the present invention includes: a main hydraulic cylinder 28, an ejecting plunger cylinder 29, a plurality of blanking plunger cylinders 20-23, a main oil tank 36, a high-level oil tank 19, two The two-position electromagnetic reversing valve 9 , the three-position four-way electro-hydraulic reversing valve 10 , the electromagnetic reversing valve 31 , the first electro-hydraulic reversing valve 32 , the second electro-hydraulic reversing valve 13 and the electromagnetic overflow valve 3 . The main oil tank is connected to the first one-way valve 4 through the variable pump 2 , and the first one-way valve 4 is respectively connected to the oil inlet of the three-position four-way electro-hydraulic reversing valve 10 and the inlet of the first electro-hydraulic reversing valve 32 . The oil port and the oil inlet P of the second electro-hydraulic reversing valve 13, the first working port A of the three-position four-way electro-hydraulic reversing valve 10 is connected to the rodless cavity of the master hydraulic cylinder 28 through the second one-way valve 11 , the rod cavity of the main hydraulic cylinder 28 is connected to the second working port B of the three-position four-way electro-hydraulic reversing valve 10, and the oil return port T of the three-position four-way electro-hydraulic reversing valve is connected to the two-position two-way electromagnetic reversing valve 9. The two-position, two-way electromagnetic reversing valve 9 is respectively connected to the cooler 33 and the oil discharge port of the first electro-hydraulic reversing valve 32 , and the cooler 33 is connected to the main oil tank through the filter 1 . The oil outlet of the first electro-hydraulic reversing valve 32 is connected to an electromagnetic reversing valve 31 , and the electromagnetic reversing valve 31 is connected to the ejecting plunger cylinder 29 . The oil outlets of the second electro-hydraulic reversing valve 13 are respectively connected to the corresponding blanking plunger cylinders through a plurality of hydraulically controlled check valves 14-18, and the high-level oil tank 19 is also connected to the corresponding blanking pressing through the hydraulically controlled one-way valves. The plunger cylinder, the oil return port of the second electro-hydraulic reversing valve 13 is connected to the main oil tank. The first working port of the electromagnetic relief valve 3 is connected to the oil outlet of the variable pump 2 , and the second working port of the electromagnetic relief valve 3 is connected to the main oil tank 36 . An accumulator 5 is provided on the pipeline connecting the first one-way valve 4 and the three-position four-way electro-hydraulic reversing valve 10 .

In specific implementation, the system includes four blank holder plunger cylinders 20-23 and four direct-acting relief valves 24-27, each of which is correspondingly connected to the oil inlet of a direct-acting relief valve. The oil outlet of the direct-acting relief valve is connected to the main oil tank.

During specific implementation, the hydraulic system of the punching machine is further provided with an air filter 34 and a liquid level liquid temperature display 35 respectively connected to the main oil tank 36 .

In specific implementation, a pressure gauge 7 is provided on the pipeline connecting the first check valve 4 and the three-position four-way electro-hydraulic reversing valve 10 , and the pressure gauge 7 is connected to the pipeline through the pressure gauge switch 6 .

During specific implementation, a throttle valve 8 is provided between the oil return port of the three-position four-way electro-hydraulic reversing valve 10 and the oil discharge port of the first electro-hydraulic reversing valve 32 .

In specific implementation, a pilot-operated relief valve 30 is provided on the pipeline connecting the first electro-hydraulic reversing valve 3 and the ejector plunger cylinder 29, and the oil inlet of the pilot-operated relief valve 30 is connected to the ejector column The plug cylinder 29 and the oil outlet of the pilot-operated relief valve 30 are connected to the oil outlet of the first electro-hydraulic reversing valve 3 .

In specific implementation, hydraulic hoses are used to connect each component, and different types of pipe joints and crimp joints are used according to different types of components. A pressure relay 12 is provided on the pipeline connecting the second one-way valve 11 and the main hydraulic cylinder 28, and an electrical signal is generated when the pressure reaches a set value.

Working principle: The stamping machine is used for stamping and forming of sheet metal and thin plates, such as the front cover of automobiles. The main hydraulic cylinder 28 is used to press the workpiece, and then press and form. The die is arranged on the ejection plunger cylinder 29, and the ejection plunger cylinder 29 ejects the workpiece after stamping. Crimping plunger cylinders are used to hold down the workpiece during the stamping process. The blank holding plunger cylinder, the ejecting plunger cylinder 29 and the main hydraulic cylinder 28 are rigidly connected by a mechanical structure, the piston rod is pushed out by high pressure oil, and the piston rod retracts is driven by the main hydraulic cylinder.

1. The main hydraulic cylinder 28 goes down quickly:

Oil inlet circuit: variable pump 2 → first check valve 4 → three-position four-way electro-hydraulic reversing valve 10 → second check valve 11 → main hydraulic cylinder 28 rodless cavity.

Oil return circuit: main hydraulic cylinder 28 has rod cavity → three-position four-way electro-hydraulic reversing valve 10 → two-position two-barrel electromagnetic reversing valve 9 → cooler 33 → filter 1 → main oil tank 36.

2. Quick return of main hydraulic cylinder 28:

Oil inlet circuit: variable pump 2→first check valve 4→three-position four-way electro-hydraulic reversing valve 10→pulling the main hydraulic cylinder 28 with rod cavity.

Oil return circuit: main hydraulic cylinder 28 rodless cavity → hydraulic control check valve 16 → high level oil tank 11

3. The working process of ejecting the plunger cylinder:

The oil inlet path extended by the ejecting plunger cylinder: variable pump 2 → first check valve 4 → first electro-hydraulic reversing valve 32 right position → electromagnetic reversing valve 31 → entering into the ejecting plunger cylinder 29 .

Retraction of the ejection plunger cylinder: After the ejection plunger cylinder ejects the workpiece, it encounters the travel switch, and the travel switch sends out an electric signal, which makes the coil 1YA of the electromagnetic relief valve 3 and the coil 2YA of the first electro-hydraulic reversing valve 32 All power is lost, the variable pump 2 is unloaded, the electromagnetic reversing valve 31 works in the right position, the first electro-hydraulic reversing valve 32 works in the left position, the ejecting plunger cylinder 29 descends under its own weight, and the oil is sequentially reversed by the valve electromagnetically. The valve 31 , the first electro-hydraulic reversing valve 32 , the cooler 33 and the filter 1 flow back to the main tank 36 .

4. The working process of the blank holder plunger cylinder 20 to 23

The blank holder plunger cylinder extends: variable pump 2 → first check valve 4 → second electro-hydraulic reversing valve 13 → hydraulic control check valve 14, 15, 17, 18 → blank holder plunger cylinder 20-23.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the idea of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the present invention. within the scope of protection.

Claims (6)

1. a hydraulic system of a punching machine, is characterized in that, comprises: main hydraulic cylinder, ejection plunger cylinder, a plurality of blank holder plunger cylinders, main oil tank, high-level oil tank, two-position two-way electromagnetic reversing valve, three-position Four-way electro-hydraulic reversing valve, electromagnetic reversing valve, first electro-hydraulic reversing valve, second electro-hydraulic reversing valve and electromagnetic relief valve; the main oil tank is connected to the first one-way valve through a variable pump, and the third A one-way valve is respectively connected to the oil inlet of the three-position four-way electro-hydraulic reversing valve, the oil inlet of the first electro-hydraulic reversing valve and the oil inlet of the second electro-hydraulic reversing valve. The first working port of the reversing valve is connected to the rodless cavity of the main hydraulic cylinder through the second one-way valve, and the rod cavity of the main hydraulic cylinder is connected to the second working port of the three-position four-way electro-hydraulic reversing valve. The oil return port of the reversing valve is connected to the two-position two-way electromagnetic reversing valve, and the two-position two-way electromagnetic reversing valve is respectively connected to the cooler and the oil discharge port of the first electro-hydraulic reversing valve, and the cooler passes through the filter The oil outlet of the first electro-hydraulic reversing valve is connected to the electromagnetic reversing valve, and the electromagnetic reversing valve is connected to the ejection plunger cylinder; the oil outlets of the second electro-hydraulic reversing valve are respectively A plurality of hydraulically controlled check valves are connected to the corresponding blanking plunger cylinders, the high-level fuel tank is also connected to the corresponding blanking plunger cylinders through the hydraulically controlled one-way valves, and the oil return port of the second electro-hydraulic reversing valve is connected to main oil tank; the first working port of the electromagnetic relief valve is connected to the oil outlet of the variable pump, and the second working port of the electromagnetic relief valve is connected to the main oil tank; the first one-way valve and the three-position four-way electro-hydraulic reversing valve An accumulator is provided on the connected pipeline. 2. The hydraulic system of a punch press according to claim 1, wherein the system comprises four blank holder plunger cylinders, and each blank holder plunger cylinder is correspondingly connected to an oil inlet of a direct-acting relief valve , The oil outlet of the direct-acting relief valve is connected to the main oil tank. 3. The hydraulic system of the punch press according to claim 1, characterized in that, the hydraulic system of the punch press is further provided with an air filter and a liquid level and temperature indicator respectively connected to the main oil tank. 4. The hydraulic system of claim 1, wherein a pressure gauge is provided on the pipeline connecting the first check valve and the three-position four-way electro-hydraulic reversing valve. 5. The hydraulic system of claim 1, wherein a joint is provided between the oil return port of the three-position four-way electro-hydraulic reversing valve and the oil discharge port of the first electro-hydraulic reversing valve. flow valve. 6 . The hydraulic system of the punch press according to claim 1 , wherein the pipeline connecting the first electro-hydraulic reversing valve and the ejecting plunger cylinder is provided with a pilot-operated relief valve, and the pilot-operated relief valve is provided. 7 . The oil inlet of the flow valve is connected to the ejection plunger cylinder, and the oil outlet of the pilot relief valve is connected to the oil outlet of the first electro-hydraulic reversing valve.

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