CN204677544U - A kind of closed type hydraulic pump clockwise and anticlockwise load-sensitive pilot system - Google Patents

Abstract

The utility model discloses a forward and reverse load sensitive test system of a closed hydraulic pump, comprising a main fuel tank, a first test oil circuit, a second test oil circuit, a bridge circuit, an oil drain circuit, a control oil circuit, and a pressure oil supply circuit And the first X port controls the oil circuit; the bridge circuit is connected in sequence by the first one-way valve, the second one-way valve, the third one-way valve, and the fourth one-way valve to form a closed circuit structure, wherein the adjacent A first node, a second node, a third node, and a fourth node are sequentially formed between the one-way valves. The test system can simulate load changes to carry out positive and negative load sensitivity tests on closed hydraulic pumps, and can even simulate performance tests of hydraulic products under X-port control. It has the advantages of wide testing applications and convenient operation.

Description

A Closed Hydraulic Pump Forward and Reverse Load Sensitive Test System

technical field

The utility model belongs to the technical field of hydraulic product detection and relates to a forward and reverse load sensitive test system of a closed hydraulic pump.

Background technique

The hydraulic pump is the power component of the hydraulic system. It is driven by an engine or an electric motor. It sucks oil from the hydraulic oil tank, forms pressure oil and discharges it, and sends it to the actuator. The closed hydraulic pump adopts the pressure oil supply method when it is working. After the closed hydraulic pump is manufactured, it is necessary to test the load sensitivity of the pump, that is, to test the pressure, temperature and flow value of the hydraulic pump under the condition of load change at the beginning of the test. For the swash plate type plunger variable pump, it is also necessary to test the change of the flow rate of the pump through the X port. However, the current test system is difficult to meet the above requirements.

Utility model content

The technical problem to be solved by the utility model is to provide a closed hydraulic pump forward and reverse load sensitive test system to overcome the shortcomings of the prior art.

In order to solve the problems of the technologies described above, the utility model adopts the following technical solutions:

A closed hydraulic pump forward and reverse load sensing test system, which includes a main oil tank, a first test oil circuit, a second test oil circuit, a bridge circuit, an oil drain circuit, a control oil circuit, a pressure oil supply circuit and a first X port controls the oil circuit;

The bridge circuit is sequentially connected by the first one-way valve, the second one-way valve, the third one-way valve, and the fourth one-way valve to form a closed circuit structure, wherein the first one-way valve is sequentially formed between adjacent one-way valves. node, second node, third node, fourth node;

The first test oil circuit includes a first flowmeter, a first shut-off valve, a first temperature sensor, and a first pressure sensor; one end of the first flowmeter is connected to the first main oil port of the product pump to be tested, and the other end Connect the first cut-off valve, the first cut-off valve is connected to the first node of the bridge circuit, the first temperature sensor and the first pressure sensor are installed on the first flow rate of the first test oil circuit The position between the meter and the first main oil port of the product under test;

The second test oil circuit includes an oil return filter, a second flow meter, a second stop valve, a second temperature sensor, and a second pressure sensor; The other end is connected to the second shut-off valve through the second flowmeter, and the second shut-off valve is connected to the third node of the bridge circuit. The second temperature sensor, the second pressure sensor Installed at the position between the oil return filter and the second flowmeter on the second test oil circuit;

The oil drain circuit includes a third cut-off valve, an external leakage filter, a third flowmeter, a third temperature sensor, a third pressure sensor, and an electric on-off valve; one end of the third cut-off valve is connected to the leakage of the product pump under test oil port, the other end is connected to the third flow meter through the outer leakage filter, and the third flow meter is connected to the main oil tank, and the electric switch valve is connected in parallel on the third flow meter; The third temperature sensor and the third pressure sensor are installed at the position between the external leakage filter and the third flowmeter of the oil drain;

The control oil circuit includes a first relief valve and a second relief valve; after the first relief valve and the second relief valve are connected in parallel, one end is connected to the second node of the bridge circuit, The other end is connected to the main tank;

The pressure oil supply circuit includes a fifth cut-off valve, a first oil pump, an eighth oil filter, a fourth relief valve, and a fifth relief valve; one end of the fifth cut-off valve is connected to the main oil tank, and the other end is sequentially Connected to the fourth node of the bridge circuit via the first oil pump, the eighth oil filter, the fourth relief valve, and the fifth relief valve;

The first X port control oil circuit includes the seventh cut-off valve, the third oil pump, the eighth relief valve, and the ninth relief valve; one end of the seventh cut-off valve is connected to the main oil tank, and the other end is connected to the first The three oil pumps, the fourth oil filter, the eighth overflow valve and the ninth overflow valve connected in parallel, are then connected to the first quick connector with a one-way valve.

After the first overflow valve and the second overflow valve are connected in parallel, the other end passes through the parallel first cooler and second cooler, and then connects back to the first oil filter main fuel tank.

The comprehensive test system also includes a pilot control oil circuit, the pilot control oil circuit includes the sixth stop valve, the second oil pump, the sixth relief valve, and the seventh relief valve; one end of the sixth stop valve is connected to the main The oil tank and the other end are connected to the control oil inlet of the fourth overflow valve through the second oil pump, the fifth one-way valve, and the second oil filter in sequence, and the control oil inlet of the fourth overflow valve The control dump port connects back to the main tank.

A pressure retainer and a fifth pressure sensor are arranged on the pilot control oil circuit.

The fourth oil filter is also directly connected to the second quick connector with a check valve.

The test system also includes the second X port control oil circuit, the second X port control oil circuit includes the eighth stop valve, the fourth oil pump, the tenth relief valve, and the eleventh relief valve; the eighth stop valve One end of the valve is connected to the main oil tank, the other end passes through the fourth oil pump, the fifth oil filter, the tenth relief valve and the eleventh relief valve connected in parallel, and then connects to the third quick connector with a one-way valve .

The fifth oil filter is also directly connected to the fourth quick connector with a check valve.

The comprehensive test system also includes a cooling circulation oil circuit, which includes the sixth oil filter, the third cooler, the seventh oil pump, the ninth shut-off valve and the cold oil tank; one end of the sixth oil filter is connected to The other end of the main oil tank is connected to the cold oil tank through the third cooler, the seventh oil pump, and the ninth shut-off valve in turn, and the cold oil tank is connected back to the main oil tank.

The comprehensive test system also includes a waste oil recovery circuit, which includes a fifth oil pump, a sixth oil pump, a sixth one-way valve, a seventh one-way valve, and a seventh oil filter; One end of the oil pump and the sixth oil pump are respectively connected to the waste oil tank, and the other ends are respectively connected to the cold oil tank through the sixth one-way valve, the seventh one-way valve, and the seventh oil filter.

By adopting the above-mentioned technical scheme, the forward and reverse load sensitive test system of the closed hydraulic pump of the present invention can simulate the load change condition to carry out forward and reverse load sensitivity test of the closed hydraulic pump, and test the hourly flow rate and pressure under the load change condition. As well as temperature changes, it can even simulate the performance test of hydraulic products under X-port control. Therefore, the forward and reverse load sensitive test system of the closed hydraulic pump of the present invention has the advantages of wide testing application, convenient operation and the like.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described in detail:

Fig. 1 is a schematic diagram of the system structure of the present utility model.

Detailed ways

As shown in Figure 1, the positive and negative load sensing test system of the closed hydraulic pump of the present invention includes a main oil tank 100, a first test oil circuit 300, a second test oil circuit 400, a bridge circuit 500, and a drain circuit 600 and a control oil circuit 700 .

The bridge circuit 500 is composed of four first one-way valves F1, second one-way valve F2, third one-way valve F3, and fourth one-way valve F4 connected in sequence to form a closed circuit structure, wherein the adjacent one-way valves The first node J1, the second node J2, the third node J3, and the fourth node J4 are sequentially formed between them.

The first test oil circuit 300 includes a first flow meter L1, a first stop valve K1, a first temperature sensor W1, and a first pressure sensor P1. Wherein, one end of the first flow meter L1 is connected to the first main oil port of the product pump under test, and the other end is connected to the first cut-off valve K1. The first cut-off valve K1 is then connected to the first node J1 of the bridge circuit 500 . The first temperature sensor W1 and the first pressure sensor P1 are installed on the first test oil circuit 300 between the first flow meter L1 and the first main oil port of the tested product.

The second test oil circuit 400 includes an oil return filter G1, a second flow meter L2, a second stop valve K2, a second temperature sensor W2, and a second pressure sensor P2. Wherein, one end of the oil return filter G1 is connected to the second main oil port of the product pump under test, and the other end is connected to the second cut-off valve K2 through the second flow meter L2. The second cut-off valve K2 is then connected to the third node J3 of the bridge circuit. The second temperature sensor W2 and the second pressure sensor P2 are installed on the second test oil circuit 400 between the oil return filter G1 and the second flow meter L2.

The oil drain circuit 600 includes a third cut-off valve K3, an external leakage filter G2, a third flow meter L3, a third temperature sensor W3, a third pressure sensor P3, and an electric on-off valve D2. One end of the third cut-off valve K3 is connected to the leakage oil port of the product pump under test, and the other end is connected to the third flow meter L3 through the outer leakage filter G2. The third flowmeter L3 is connected to the main oil tank 100 again, and the electric on-off valve D2 is connected in parallel on the third flowmeter L3. The third temperature sensor W3 and the third pressure sensor P3 are installed in the position between the leakage filter G2 and the third flowmeter L3 of the oil leakage passage 600;

The control oil circuit 700 includes a first relief valve Y1 and a second relief valve Y2. Wherein, after the first relief valve Y1 and the second relief valve Y2 are connected in parallel, one end is connected to the second node J2 of the bridge circuit 500, and the other end is connected to the first cooler Q1 and the second cooler Q2 in parallel, and then It is then connected to the main oil tank 100 through the first oil filter N1.

In addition, the test system also includes a pressure oil supply circuit 810 , a pilot control oil circuit 820 , a first X-port control oil circuit 830 , and a second X-port control oil circuit 840 .

The pressure oil supply circuit 810 includes a fifth cut-off valve K5, a first oil pump B1, an eighth oil filter N8, a fourth relief valve Y4, and a fifth relief valve Y5. Among them, one end of the fifth cut-off valve K5 is connected to the main oil tank 100, and the other end is connected to the first oil pump B1, the eighth oil filter N8, the fourth relief valve Y4, and the fifth relief valve Y5 to the bridge circuit 500 in sequence. Four nodes J4.

The pilot control oil circuit 820 includes a sixth cut-off valve K6, a second oil pump B2, a sixth relief valve Y6, and a seventh relief valve Y7. Among them, one end of the sixth cut-off valve K6 is connected to the main oil tank 100, and the other end is connected to the control oil inlet of the fourth overflow valve Y4 through the second oil pump B2, the fifth check valve F5, and the second oil filter N2 in sequence. The control oil discharge port of the four overflow valve Y4 is connected back to the main oil tank 100 through the third oil filter N3. The second oil filter N2 is connected back to the main oil tank 100 through the sixth relief valve Y6 and the seventh relief valve Y7 connected in parallel, and then through the third oil filter N3. In addition, a pressure retainer A1 and a fifth pressure sensor P5 are also arranged on the oil passage.

The first X-port control oil passage 830 includes a seventh cut-off valve K6, a third oil pump B3, an eighth relief valve Y8, and a ninth relief valve Y9. One end of the seventh cut-off valve K6 is connected to the main oil tank 100, and the other end is connected to the belt oil tank 100 through the third oil pump B3, the fourth oil filter N4, the eighth relief valve Y8 and the ninth relief valve Y9 connected in parallel, and then connected to the The first quick connector Z1 of the one-way valve is used to connect to the X port of the product oil pump. In addition, the fourth oil filter N4 is also directly connected to the second quick connector Z2 with a check valve, and the second quick connector Z2 is used to connect to the X port of the product oil pump. The eighth relief valve Y8 and the ninth relief valve Y9 connected in parallel are also connected back to the main oil tank 100 through the third oil filter N3. A sixth pressure sensor P6 is also arranged on the oil passage.

The second X-port control oil passage 840 includes an eighth cut-off valve K8, a fourth oil pump B4, a tenth relief valve Y10, and an eleventh relief valve Y11. One end of the eighth cut-off valve K8 is connected to the main oil tank 100, the other end is connected to A third quick connector Z3 with a check valve, the third quick connector Z3 is used to connect to the X port of the product oil pump. In addition, the fifth oil filter N5 is also directly connected to the fourth quick connector Z4 with a check valve. The tenth relief valve Y10 and the eleventh relief valve Y11 connected in parallel are also connected back to the main oil tank 100 through the third oil filter N3. A seventh pressure sensor P7 is also arranged on the oil passage.

In addition, the utility model also includes a cooling circulating oil circuit 850 , which includes a sixth oil filter N6 , a third cooler Q3 , a seventh oil pump B7 , a ninth shut-off valve K9 and a cold oil tank 900 . One end of the sixth oil filter N6 is connected to the main oil tank 100, and the other end is connected to the cold oil tank 900 through the third cooler Q3, the seventh oil pump B7, and the ninth shut-off valve K9 in sequence, and the cold oil tank 900 is connected back to the main oil tank 100.

It also includes a waste oil recovery oil passage 860, which includes a fifth oil pump B5, a sixth oil pump B6, a sixth one-way valve F6, a seventh one-way valve F7, and a seventh oil filter N7. One end of the fifth oil pump B5 and the sixth oil pump B6 are connected to the waste oil tank, and the other ends are respectively connected to the cold oil tank 900 through the sixth check valve F6, the seventh check valve F7, and the seventh oil filter N7.

The above is the forward and reverse load sensitive test system of the closed hydraulic pump of the present invention, and its test method is as follows:

1. Test of closed pump.

When the closed pump is rotating forward, oil enters from the main oil tank 100 through the pressure oil supply circuit 810, the fourth node J4, the first node J1, and the first test oil circuit 300 of the bridge circuit 500; through the second test oil circuit 400, The third node J3 of the bridge circuit 500, the second node J2, and the control oil circuit 700 return to the main oil tank 100; the oil drain circuit 600 leaks oil. In the control oil circuit 500, the second relief valve Y2 plays a protective role, and the first relief valve Y1 simulates the load, and the load sensitivity test can be performed, that is, by adjusting the first relief valve Y1, the closed pump can be tested in the first Test the flow, pressure and temperature values on the oil circuit 300 , the second test oil circuit 400 and the drain circuit 600 so as to test the load sensitivity of the closed pump when it is rotating forward.

When the closed pump is reversed, oil is fed from the main oil tank 100 through the pressure oil supply circuit 810, the fourth node J4 of the bridge circuit 500, the third node J3, and the second test oil circuit 400; through the first test oil circuit 300, The first node J1, the second node J2 of the bridge circuit 500, the control oil circuit 700 returns to the main oil tank 100; the oil drain circuit 600 leaks oil. In the control oil circuit 500, the second relief valve Y2 plays a protective role, and the first relief valve Y1 simulates the load, and the load sensitivity test can be performed, that is, by adjusting the first relief valve Y1, the closed pump can be tested in the first The flow, pressure, and temperature values on the test oil circuit 300 , the second test oil circuit 400 and the drain circuit 600 are changed to test the load sensitivity of the closed pump when it reverses.

The pilot control oil circuit 820 controls the oil supply amount of the pressure oil supply circuit 810 by controlling the fourth relief valve Y4 in the pressure oil supply circuit 810, and the fifth relief valve Y5 in the pressure oil supply circuit 810 is used to protect the pressure supply oil circuit 810.

2. X port control test: the first quick connector Z1 in the first X port control oil circuit 830 and the third quick connector Z3 in the second X port control oil circuit 840 can be used to connect to the swash plate type plunger variable pump X mouth. The ninth relief valve Y9 and the eleventh relief valve Y11 can simulate the actuators to control the X port of the swash plate type plunger variable pump to adjust the flow change and then perform the above-mentioned various performance tests under the X port control condition. The eighth relief valve Y8 and the tenth relief valve Y10 are respectively used to protect the first X-port control oil passage 830 and the second X-port control oil passage 840 .

3. The cooling circulating oil circuit 850 is used for circulating, filtering and cooling the hydraulic oil in the main oil tank 100, so that the hydraulic oil in the main oil tank 100 meets the requirements for use. The waste oil recovery oil passage 860 is used for reusing the waste oil after filtering.

The above is the positive and negative load sensitive test system of the closed hydraulic pump of the present utility model. It can be seen from the above detailed description that the positive and negative load sensitive test system of the closed hydraulic pump of the present utility model can simulate the load change situation to the closed hydraulic pump. The pump is tested for positive and negative load sensitivity to test the flow, pressure and temperature changes under load changes, and can even simulate the performance test of hydraulic products under X-port control. Therefore, the forward and reverse load sensitive test system of the closed hydraulic pump of the present invention has the advantages of wide testing application, convenient operation and the like.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model in any form. Anyone with ordinary knowledge in the technical field, if not departing from the protection of the claims proposed by the utility model Within the scope, the equivalent embodiments of partial changes or modifications made by using the technical content disclosed in the utility model, and without departing from the technical features of the utility model, still fall within the scope of the utility model's technical features.

Claims (9)

1. A closed type hydraulic pump forward and reverse load sensitive test system, characterized in that it includes a main fuel tank, a first test oil circuit, a second test oil circuit, a bridge circuit, an oil drain circuit, a control oil circuit, and a pressure supply circuit. Oil circuit and the first X port control oil circuit; The bridge circuit is sequentially connected by the first one-way valve, the second one-way valve, the third one-way valve, and the fourth one-way valve to form a closed circuit structure, wherein the first one-way valve is sequentially formed between adjacent one-way valves. node, second node, third node, fourth node; The first test oil circuit includes a first flowmeter, a first shut-off valve, a first temperature sensor, and a first pressure sensor; one end of the first flowmeter is connected to the first main oil port of the product pump to be tested, and the other end Connect the first cut-off valve, the first cut-off valve is connected to the first node of the bridge circuit, the first temperature sensor and the first pressure sensor are installed on the first flow rate of the first test oil circuit The position between the meter and the first main oil port of the product under test; The second test oil circuit includes an oil return filter, a second flow meter, a second stop valve, a second temperature sensor, and a second pressure sensor; The other end is connected to the second shut-off valve through the second flowmeter, and the second shut-off valve is connected to the third node of the bridge circuit. The second temperature sensor, the second pressure sensor Installed at the position between the oil return filter and the second flowmeter on the second test oil circuit; The oil drain circuit includes a third cut-off valve, an external leakage filter, a third flowmeter, a third temperature sensor, a third pressure sensor, and an electric on-off valve; one end of the third cut-off valve is connected to the leakage of the product pump under test oil port, the other end is connected to the third flow meter through the outer leakage filter, and the third flow meter is connected to the main oil tank, and the electric switch valve is connected in parallel on the third flow meter; The third temperature sensor and the third pressure sensor are installed at the position between the external leakage filter and the third flowmeter of the oil drain; The control oil circuit includes a first relief valve and a second relief valve; after the first relief valve and the second relief valve are connected in parallel, one end is connected to the second node of the bridge circuit, The other end is connected to the main tank; The pressure oil supply circuit includes a fifth cut-off valve, a first oil pump, an eighth oil filter, a fourth relief valve, and a fifth relief valve; one end of the fifth cut-off valve is connected to the main oil tank, and the other end is sequentially Connected to the fourth node of the bridge circuit via the first oil pump, the eighth oil filter, the fourth relief valve, and the fifth relief valve; The first X port control oil circuit includes the seventh cut-off valve, the third oil pump, the eighth relief valve, and the ninth relief valve; one end of the seventh cut-off valve is connected to the main oil tank, and the other end is connected to the first The three oil pumps, the fourth oil filter, the eighth overflow valve and the ninth overflow valve connected in parallel, are then connected to the first quick connector with a one-way valve. 2. The closed hydraulic pump forward and reverse load sensing test system according to claim 1, characterized in that: after the first relief valve and the second relief valve are connected in parallel, the other One end passes through the first cooler and the second cooler connected in parallel, and then connects back to the main oil tank after passing through the first oil filter. 3. The forward and reverse load sensing test system of a closed hydraulic pump according to claim 1, characterized in that it also includes a pilot control oil circuit, and the pilot control oil circuit includes a sixth cut-off valve, a second oil pump, a sixth Relief valve, the seventh relief valve; one end of the sixth cut-off valve is connected to the main oil tank, and the other end is connected to the fourth The control oil inlet of the relief valve, the control oil discharge port of the fourth relief valve is connected back to the main oil tank. 4 . The forward and reverse load sensing test system of a closed hydraulic pump according to claim 3 , wherein a pressure retainer and a fifth pressure sensor are arranged on the pilot control oil circuit. 5. The forward and reverse load sensing test system of a closed hydraulic pump according to claim 1, wherein the fourth oil filter is also directly connected to the second quick connector with a one-way valve. 6. The forward and reverse load sensing test system of a closed hydraulic pump according to claim 1 or 3, characterized in that it further includes a second X-port control oil circuit, and the second X-port control oil circuit includes an eighth cut-off valve, the fourth oil pump, the tenth relief valve, and the eleventh relief valve; one end of the eighth cut-off valve is connected to the main oil tank, and the other end passes through the fourth oil pump, the fifth oil filter, and the tenth oil filter connected in parallel. The relief valve and the eleventh relief valve are then connected to the third quick connector with a check valve. 7. The forward and reverse load sensing test system of a closed hydraulic pump according to claim 6, wherein the fifth oil filter is also directly connected to the fourth quick connector with a one-way valve. 8. The closed hydraulic pump forward and reverse load sensing test system according to claim 1, characterized in that: it also includes a cooling circulation oil circuit, and the cooling circulation oil circuit includes a sixth oil filter, a third cooler, The seventh oil pump, the ninth shut-off valve, and the cold oil tank; one end of the sixth oil filter is connected to the main oil tank, and the other end is connected to the cold oil tank through the third cooler, the seventh oil pump, and the ninth shut-off valve in sequence, and the cold oil tank Connect back to the main tank. 9. The forward and reverse load sensing test system of a closed hydraulic pump according to claim 8, characterized in that: it also includes a waste oil recovery circuit, the waste oil recovery circuit includes a fifth oil pump, a sixth oil pump, a Six one-way valves, the seventh one-way valve, and the seventh oil filter; one end of the fifth oil pump and the sixth oil pump are respectively connected to the waste oil tank, and the other ends are respectively connected to the waste oil tank through the sixth one-way valve and the seventh oil filter. The one-way valve is connected to the cold oil tank through the seventh oil filter.