Cooling machine hydraulic station with flushing and pressing functions

Abstract

The utility model discloses a cooler hydraulic station with flushing and pressing functions, which is characterized in that an oil supply path behind an oil pump supplies oil to a hydraulic cylinder, an overflow valve is arranged on the oil supply path, a proportional directional valve is arranged behind the overflow valve, and two outlets of the proportional directional valve are respectively communicated with a rodless cavity and a rod cavity of the hydraulic cylinder; oil inlets of a rodless cavity and a rod cavity of the hydraulic cylinder are respectively communicated with two oil inlets of a proportional control valve, an oil outlet of the proportional control valve is connected with a one-way valve, and the one-way valve is communicated with a hot oil return path of the oil tank; and a high-pressure filtering oil way is arranged beside the other side. According to the utility model, the external oil pipe can be flushed and subjected to a pressure test, and hot oil can be circularly cooled.

Description

Technical Field

[0001] The utility model relates to a cooling machine hydraulic station. Background Art

[0002] The existing cooling machine hydraulic station cannot flush the external oil pipe, which needs to be further improved. The hot oil in the existing oil cylinder cannot be circulated and cooled, which affects the service life of the oil cylinder seal and oil. Utility Model Content

[0003] The utility model aims to provide a cooling machine hydraulic station with flushing and pressure testing functions, which can flush and perform pressure tests on external oil pipes and circulate hot oil for cooling.

[0004] The technical solution of the utility model is:

[0005] A cooling machine hydraulic station with flushing and pressure-pressing functions, comprising a first oil pump connected to an oil tank, wherein the oil supply circuit behind the first oil pump supplies oil to the hydraulic cylinder, a first overflow valve is arranged on the oil supply circuit, a proportional reversing valve is arranged behind the first overflow valve, two outlets of the proportional reversing valve are respectively connected to a rodless chamber and a rod chamber of the hydraulic cylinder; the oil inlets of the rodless chamber and the rod chamber of the hydraulic cylinder are respectively connected to two oil inlets of a proportional control valve, the oil outlet of the proportional control valve is connected to a one-way valve, and the one-way valve is connected to the one-way valve. A hot oil return oil circuit to the oil tank is connected behind the valve; another high-pressure filtering oil circuit is set up nearby, including a second oil pump connected to the oil tank, a second overflow valve connected in parallel with the second oil pump, and the parallel oil circuit between the second overflow valve and the second oil pump is divided into two oil circuits, wherein the first oil circuit is connected with a high-pressure filter, a first high-pressure ball valve is connected behind the high-pressure filter, and the first high-pressure ball valve is connected to the rodless chamber of the hydraulic cylinder; the second oil circuit is connected with a cooler, a second high-pressure ball valve is connected behind the cooler, and the second high-pressure ball valve is connected to the rod chamber of the hydraulic cylinder.

[0006] There are two high pressure filters connected in series.

[0007] The utility model has a high-pressure filtering oil circuit arranged beside the self-circulating filtering cooling circuit of the oil tank. By switching the oil circuit, it can be used for flushing the external oil pipe to filter the impurities in the external oil pipe. At the same time, due to the high-pressure ball valve, it can also be used for the pressure resistance test of the external oil pipe to detect the welding quality to see if it is unqualified, thereby improving the stability of the later system operation.

[0008] The proportional control valve group has an online maintenance function. A one-way valve is configured in the return oil circuit of each proportional control valve group. When a certain proportional control valve group fails, the circuit can be disassembled and the oil in the total return oil pipe will not spray out, which will not affect the operation of other proportional control valve groups.

[0009] The system is equipped with an oil change function. A hot oil shuttle valve (composed of a proportional control valve and a check valve) is added to the oil inlet and outlet of the oil cylinder. At the same time, a separate oil circuit is set up to collect the return oil of the hot oil shuttle valve into the fuel tank for cooling. In this way, the hot oil at the oil cylinder end can be continuously discharged and circulated during operation, improving the service life of the oil cylinder seals and the oil fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0011] Figure 1 is a schematic structural diagram of an embodiment of the present utility model.

[0012] Figure 2 is a schematic structural diagram of a side-mounted high-pressure filtration oil circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] A hydraulic station for a cooler with flushing and pressure testing functions includes a first oil pump 2 communicated with a fuel tank 1. The oil supply oil circuit after the first oil pump supplies oil to a hydraulic cylinder 4. A first overflow valve 3 is provided on the oil supply oil circuit. A proportional directional valve 5 is provided after the first overflow valve. The two outlets of the proportional directional valve are respectively communicated with the rodless cavity and the rod cavity of the hydraulic cylinder. The oil inlet of the rodless cavity and the rod cavity of the hydraulic cylinder are respectively communicated with the two oil inlets of a proportional control valve 6. The oil outlet of the proportional control valve is connected to a check valve 7. The check valve is then connected to a hot oil return oil circuit 8 leading to the fuel tank. A filter 11 is provided on the hot oil return oil circuit. Another side-mounted high-pressure filtration oil circuit includes a second oil pump 9 communicated with the fuel tank. A second overflow valve 10 is connected in parallel with the second oil pump. The parallel oil circuit of the second overflow valve and the second oil pump is divided into two oil circuits. A high-pressure filter 12 is connected to the first oil circuit. There are two high-pressure filters, which are connected in series. A first high-pressure ball valve 13 is connected after the high-pressure filter and is communicated with the rodless cavity of the hydraulic cylinder. A cooler 15 is connected to the second oil circuit. A second high-pressure ball valve 14 is connected after the cooler and is communicated with the rod cavity of the hydraulic cylinder.

[0014] The proportional control valve group has an on-line maintenance function, so that when this circuit is disassembled, it does not affect the operation of other proportional control valve groups. The self-circulation system has flushing and pressure testing functions, which can be used for the flushing work of external oil pipes and also for the pressure resistance test of external oil pipes.

Claims

1. A cooling machine hydraulic station with flushing and pressure-pressing functions, comprising a first oil pump connected to an oil tank, characterized in that: The oil supply circuit after the first oil pump supplies oil to the hydraulic cylinder, and a first overflow valve is provided on the oil supply circuit, and a proportional reversing valve is provided after the first overflow valve, and two outlets of the proportional reversing valve are respectively communicated with the rodless chamber and the rod chamber of the hydraulic cylinder; the oil inlets of the rodless chamber and the rod chamber of the hydraulic cylinder are respectively communicated with the two oil inlets of the proportional control valve, and the oil outlet of the proportional control valve is connected with a one-way valve, and the one-way valve is connected to the hot oil return circuit leading to the oil tank; another high-pressure filtering oil circuit is provided sideways, including a second oil pump connected to the oil tank, a second overflow valve is connected in parallel with the second oil pump, and the parallel oil circuit of the second overflow valve and the second oil pump is divided into two oil circuits, wherein the first oil circuit is connected with a high-pressure filter, and the high-pressure filter is connected with a first high-pressure ball valve after the high-pressure filter, and the first high-pressure ball valve is communicated with the rodless chamber of the hydraulic cylinder, and the second oil circuit is connected with a cooler, and the cooler is connected with a second high-pressure ball valve after the cooler, and the second high-pressure ball valve is communicated with the rod chamber of the hydraulic cylinder.

2. The cooling machine hydraulic station with flushing and pressure-pressing function according to claim 1 is characterized in that: There are two high pressure filters connected in series.

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