Pulling-back steel wire rope valve stand structure of stretcher

Abstract

The utility model relates to a stretcher pull-back steel wire rope valve stand structure which comprises a PLC, a hydraulic oil circuit, a hydraulic oil cylinder and a pump machine, one end of the pump machine is connected with an oil tank, the other end of the pump machine is connected with the hydraulic oil cylinder through the hydraulic oil circuit, the pump machine is connected with a control circuit and connected with the PLC through the control circuit, and a reversing valve and a pressure reducing valve are arranged on the hydraulic oil circuit. The hydraulic oil cylinder comprises a left cavity and a right cavity, the left cavity and the right cavity are connected with a working oil port of the reversing valve through a hydraulic oil way, an oil return port of the reversing valve is connected with the oil tank, an oil inlet of the reversing valve is connected with the pressure reducing valve, and the pressure reducing valve is further connected with the oil return port and the oil tank. And the reversing valve and the pressure reducing valve are electrically connected with the PLC. According to the utility model, the reversing valve is arranged to replace an unloading valve to improve the unloading speed, the pressure reducing valve is arranged to further improve the unloading effect, and the PLC is combined to realize automatic control of the stretcher.

Description

Technical Field

[0001] The utility model belongs to the technical field of stretching machine control, in particular to a stretching machine pull-back wire rope valve platform structure. Background Art

[0002] In sheet metal production, sheets must be stretched before they can flow to the next process. The smooth operation of the stretching machine significantly impacts the overall sheet material throughput rate. The existing stretching machine has 24 pull-back wire ropes installed on both sides. The stretching machine is equipped with a hydraulic cylinder that drives the wire ropes to perform the stretching operation. Due to the high pulling force of the stretching machine, the hydraulic oil circuit has high pressure. Therefore, an unloading valve is installed in the hydraulic circuit to relieve pressure when the hydraulic cylinder returns oil. However, the unloading valve's slow pressure relief makes the pull-back wire ropes prone to breakage.

[0003] The 24 pull-back steel ropes of the existing stretching machine need to be replaced every four months. Each replacement requires 12 employees divided into two groups to carry out the work simultaneously, and it takes 10 hours to complete the replacement. This consumes a lot of manpower and material resources and seriously affects production efficiency.

[0004] Therefore, a valve table structure with large unloading flow is urgently needed to avoid wire rope breakage. Summary of the Invention

[0005] In order to solve the problem of slow unloading speed of the existing hydraulic oil circuit of the stretching machine, the utility model provides a stretching machine pull-back wire rope valve platform structure, arranges a reversing valve instead of an unloading valve to improve the unloading speed, and arranges a pressure reducing valve to further improve the unloading effect, and combines with a PLC controller to realize automatic control of the stretching machine.

[0006] In order to achieve the above-mentioned purpose, the utility model proposes a stretching machine pull-back wire rope valve station structure, which includes a PLC controller, a hydraulic oil circuit, a hydraulic cylinder and a pump. One end of the pump is connected to the oil tank, and the other end is connected to the hydraulic cylinder through the hydraulic oil circuit. The pump is connected to a control circuit, and the pump is connected to the PLC controller through the control circuit. A reversing valve and a pressure reducing valve are provided on the hydraulic oil circuit.

[0007] The hydraulic cylinder includes a left chamber and a right chamber, the left chamber and the right chamber are connected to the working oil port of the reversing valve through a hydraulic oil circuit, the oil return port of the reversing valve is connected to the oil tank, the oil inlet of the reversing valve is connected to the pressure reducing valve, and the pressure reducing valve is also connected to the oil return port and the oil tank respectively;

[0008] The reversing valve and the pressure reducing valve are both electrically connected to the PLC controller.

[0009] Furthermore, the reversing valve comprises a three-position four-way solenoid reversing valve, the three-position four-way solenoid reversing valve comprising a coil A, a coil B and a working oil port A, a working oil port B, the working oil port A is connected to the left chamber, and the working oil port B is connected to the right chamber;

[0010] The coil A and the coil B are both electrically connected to the output end of the PLC controller.

[0011] A three-position four-way solenoid directional valve is used to allow the hydraulic oil to flow quickly into the oil tank, meeting the high-pressure and large-flow system requirements of the stretching machine. The three-position four-way solenoid directional valve is easy to control, and the hydraulic cylinder can be controlled through a PLC controller.

[0012] Furthermore, a pressure sensor is provided on the hydraulic oil circuit, the output end of the pressure sensor is connected to the input end of the PLC controller, and the pressure sensor is used to detect the pressure of the hydraulic oil circuit.

[0013] A pressure sensor is set up to detect the hydraulic pressure of the hydraulic oil circuit and combined with a PLC controller to provide a hardware basis for the automatic control of the valve station.

[0014] Furthermore, the control circuit includes a frequency converter, the frequency converter is communicatively connected to the PLC controller, and the frequency converter is electrically connected to the pump.

[0015] The PLC controller adjusts the pump power through the frequency converter to achieve stable operation of the valve station.

[0016] Furthermore, the pressure reducing valve includes a superimposed pressure reducing valve, and the superimposed pressure reducing valve is communicatively connected to a PLC controller.

[0017] Through the above technical solution, the beneficial effects of the utility model are:

[0018] This utility model achieves high-flow unloading with reduced pressure, preventing the stretcher's hydraulic cylinder from breaking due to high unloading oil pressure. A reversing valve and a pressure reducing valve are installed in the hydraulic oil circuit. The left and right chambers of the hydraulic cylinder are connected to the working oil port of the reversing valve. The reversing valve replaces the existing unloading valve to improve the unloading capacity of the hydraulic oil circuit. In addition, the oil inlet of the reversing valve is connected to a pressure reducing valve to adjust the flow of the hydraulic oil circuit, further improving the unloading capacity and preventing the hydraulic cylinder from moving too quickly and causing the wire rope to break. A PLC controller is also installed to control the reversing valve, unloading valve, and pump to complete the automatic operation of the stretcher, improving production safety and work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a hydraulic principle diagram of the valve platform structure for pulling back the wire rope of a stretching machine in the utility model;

[0020] Figure 2 It is the principle diagram of the unloading valve in the background technology;

[0021] Figure 3 This is a circuit diagram of a valve platform structure for pulling back the wire rope of a stretching machine in the utility model.

[0022] Figure numbers: 1 is PLC controller, 2 is hydraulic oil circuit, 3 is hydraulic cylinder, 4 is pump, 5 is oil tank, 6 is reversing valve, 7 is pressure reducing valve, 8 is pressure sensor, and 9 is frequency converter. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] Example 1

[0025] like Figures 1-3 As shown, a valve station structure for pulling back a wire rope in a stretching machine includes a PLC controller 1, a hydraulic oil circuit 2, a hydraulic cylinder 3, and a pump 4. One end of the pump 4 is connected to an oil tank 5, and the other end is connected to the hydraulic cylinder 3 through the hydraulic oil circuit 2. The pump 4 is connected to a control circuit, and the pump 4 is connected to the PLC controller 1 through the control circuit. It is characterized in that a reversing valve 6 and a pressure reducing valve 7 are provided on the hydraulic oil circuit 2;

[0026] The hydraulic cylinder 3 includes a left chamber and a right chamber, which are connected to the working oil port of the reversing valve 6 through the hydraulic oil circuit 2. The return oil port of the reversing valve 6 is connected to the oil tank 5. The oil inlet of the reversing valve 6 is connected to the pressure reducing valve 7. The pressure reducing valve 7 is also connected to the return oil port and the oil tank 5 respectively.

[0027] The reversing valve 6 and the pressure reducing valve 7 are both electrically connected to the PLC controller 1 .

[0028] The reversing valve 6 comprises a three-position four-way solenoid reversing valve, which comprises a coil A, a coil B and a working oil port A, a working oil port B, an oil inlet port P and an oil return port T. The working oil port A is connected to the left chamber, and the working oil port B is connected to the right chamber.

[0029] The coil A and the coil B are both electrically connected to the output end of the PLC controller 1 .

[0030] The hydraulic oil circuit 2 is further provided with a pressure sensor 8 , the output end of the pressure sensor 8 is connected to the input end of the PLC controller 1 , and the pressure sensor 8 is used to detect the pressure of the hydraulic oil circuit 2 .

[0031] The control circuit includes a frequency converter 9 , which is communicatively connected to the PLC controller 1 and electrically connected to the pump 4 .

[0032] The pressure reducing valve 7 comprises a superimposed pressure reducing valve, and the superimposed pressure reducing valve is communicatively connected to the PLC controller 1 .

[0033] 1 is the PLC controller, 2 is the hydraulic oil circuit, 3 is the hydraulic cylinder, 4 is the pump, 5 is the oil tank, 6 is the reversing valve, 7 is the pressure reducing valve, 8 is the pressure sensor, and 9 is the frequency converter.

[0034] like Figure 1 As shown, the working oil port A of the three-position four-way solenoid reversing valve is connected to the left chamber of the hydraulic cylinder 3, the working oil port B is connected to the right chamber of the hydraulic cylinder 3, the oil inlet P of the three-position four-way solenoid reversing valve is connected to the oil outlet 1 of the pressure reducing valve 7 through the hydraulic oil circuit 2, the oil return port T of the three-position four-way solenoid reversing valve is connected to the oil outlet 2 of the pressure reducing valve 7, and the oil inlet of the pressure reducing valve 7 is connected to the pump 4.

[0035] During operation, PLC controller 1 energizes coil A of the three-position, four-way solenoid directional valve, shifting the valve to the left position. PLC controller 1 controls pump 4 via frequency converter 9. It obtains the hydraulic pressure in the hydraulic circuit via pressure sensor 8 and controls the valve opening of the stacked pressure reducing valve based on the detected hydraulic pressure. Hydraulic oil flows from inlet P through pressure reducing valve 7, inlet P of the three-position, four-way solenoid directional valve, and working port B of the three-position, four-way solenoid directional valve into the right chamber of hydraulic cylinder 3. Hydraulic oil continues to flow into the right chamber, causing the piston rod to move to the left. The hydraulic oil in the left chamber returns to tank 5 through working port A of the three-position, four-way solenoid directional valve and return port T of the three-position, four-way solenoid directional valve. The piston rod of hydraulic cylinder 3 extends.

[0036] PLC controller 1 energizes coil B of the three-position, four-way solenoid directional valve, shifting the valve to the right position. PLC controller 1 obtains the hydraulic pressure in the hydraulic circuit via pressure sensor 8 and controls the valve opening of the superimposed pressure reducing valve based on the detected hydraulic pressure. Hydraulic oil enters the left chamber of hydraulic cylinder 3 from inlet P through pressure reducing valve 7, inlet P of the three-position, four-way solenoid directional valve, and working oil port A of the three-position, four-way solenoid directional valve. Hydraulic oil continues to flow into the left chamber, causing the piston rod to move to the right. The hydraulic oil in the left chamber returns to tank 5 through working oil port B of the three-position, four-way solenoid directional valve and return oil port T of the three-position, four-way solenoid directional valve. The piston rod of hydraulic cylinder 3 is reset.

[0037] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A wire rope retraction valve station structure for a stretching machine, comprising a PLC controller (1), a hydraulic oil circuit (2), a hydraulic oil cylinder (3) and a pump (4), wherein one end of the pump (4) is connected to an oil tank (5), and the other end is connected to the hydraulic oil cylinder (3) through the hydraulic oil circuit (2), the pump (4) is connected to a control circuit, and the pump (4) is connected to the PLC controller (1) through the control circuit, characterized in that: The hydraulic oil circuit (2) is provided with a reversing valve (6) and a pressure reducing valve (7); The hydraulic cylinder (3) comprises a left chamber and a right chamber, the left chamber and the right chamber are connected to the working oil port of the reversing valve (6) through a hydraulic oil circuit (2), the oil return port of the reversing valve (6) is connected to the oil tank (5), the oil inlet of the reversing valve (6) is connected to the pressure reducing valve (7), and the pressure reducing valve (7) is also connected to the oil return port and the oil tank (5). The reversing valve (6) and the pressure reducing valve (7) are both electrically connected to the PLC controller (1).

2. A stretching machine pull-back wire rope valve platform structure according to claim 1, characterized in that: The reversing valve (6) comprises a three-position four-way electromagnetic reversing valve, the three-position four-way electromagnetic reversing valve comprising a coil A, a coil B and a working oil port A, a working oil port B, an oil inlet port P and an oil return port T, the working oil port A being in communication with the left chamber, and the working oil port B being in communication with the right chamber; The coil A and the coil B are both electrically connected to the output end of the PLC controller (1).

3. The stretching machine pull-back wire rope valve platform structure according to claim 1, characterized in that: A pressure sensor (8) is also provided on the hydraulic oil circuit (2), and the output end of the pressure sensor (8) is connected to the input end of the PLC controller (1).

4. A stretching machine pull-back wire rope valve platform structure according to claim 3, characterized in that: The control circuit comprises a frequency converter (9), the frequency converter (9) is communicatively connected to the PLC controller (1), and the frequency converter (9) is electrically connected to the pump (4).

5. The stretching machine pull-back wire rope valve platform structure according to claim 1, characterized in that: The pressure reducing valve (7) comprises a superimposed pressure reducing valve, and the superimposed pressure reducing valve is communicatively connected to the PLC controller (1).

Images