A hydraulic pump low temperature cold start test device

Abstract

The present invention relates to a low-temperature cold start test device for a hydraulic pump, comprising a hydraulic pump connection adjustment base, an oil circuit system, a loading system, and a control and acquisition system. The hydraulic pump connection adjustment base is used to install the hydraulic pump to be tested; the oil circuit system includes an oil tank, a first oil supply line, a second oil supply line, an oil drain line, an open oil return line, and a closed oil return line. The first oil supply line is used to connect the oil inlet of the hydraulic pump to be tested to the oil tank, and the second oil supply line and the oil drain line are used to connect the oil port of the hydraulic pump housing to the oil tank; the oil inlet line of the loading system is used to connect to the oil outlet of the hydraulic pump to be tested, and the open oil return line and the closed oil return line are connected in parallel to the oil outlet of the loading system. The above-mentioned test device can accurately verify and evaluate the sealing performance and component wear of the hydraulic pump in a low-temperature environment, without requiring the entire vehicle to be tested and verified in a cold region, which helps to improve R&D testing efficiency, reduce costs, and enhance product competitiveness.

Description

Technical Field

[0001] The present invention relates to the technical field of testing devices, in particular to a low-temperature cold start testing device for a hydraulic pump. Background Art

[0002] As hydraulic pumps are used more and more frequently in extreme environments and working conditions, higher requirements are placed on the environmental adaptability of hydraulic pumps. Therefore, accurate verification and evaluation of the sealing performance and component wear of hydraulic pumps in low-temperature environments has become an indispensable part of the hydraulic pump production process. Summary of the Invention

[0003] The object of the present invention is to provide a low-temperature cold start test device for a hydraulic pump, so as to accurately verify and evaluate the sealing performance and component wear of the hydraulic pump in a low-temperature environment.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A low-temperature cold start test device for a hydraulic pump, comprising:

[0006] Hydraulic pump connection adjustment base, used to install the hydraulic pump to be tested;

[0007] An oil circuit system comprising an oil tank, a first oil supply line, a second oil supply line, an oil drain line, an open oil return line, and a closed oil return line, wherein the oil tank is used to store the hydraulic oil required for the test, the first oil supply line is used to connect the oil inlet of the hydraulic pump to be tested to the oil tank, the second oil supply line and the oil drain line are used to connect the oil port of the hydraulic pump housing to the oil tank, the first oil supply line is provided with a first control valve, the second oil supply line is provided with a second control valve, the oil drain line is provided with a third control valve, the open oil return line is provided with a fourth control valve, and the closed oil return line is provided with a fifth control valve;

[0008] A loading system, wherein the oil inlet pipeline of the loading system is used to be connected to the oil outlet of the hydraulic pump to be tested, the open oil return pipeline and the closed oil return pipeline are connected in parallel to the oil outlet of the loading system, the open oil return pipeline is connected to the oil tank, and the closed oil return pipeline is connected to the oil inlet of the hydraulic pump to be tested;

[0009] A control and acquisition system includes a control device, an oil leakage flowmeter arranged on the oil leakage pipeline, an oil return flowmeter arranged at the oil outlet of the loading system, a first temperature sensor arranged on the first oil supply pipeline, a second temperature sensor arranged on the oil inlet pipeline of the loading system, a first pressure sensor arranged on the first oil supply pipeline, and a second pressure sensor arranged on the oil inlet pipeline of the loading system. The control device is respectively communicated with the oil leakage flowmeter, the oil return flowmeter, the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the loading system.

[0010] In one embodiment of the present application, a circulating filtration system is further included, and the circulating filtration system is used for circulating and filtering the hydraulic oil in the oil tank.

[0011] In one embodiment of the present application, the circulation filtration system includes a circulation pump, a first one-way valve, a filter and a cooler connected in series in sequence, the oil inlet of the circulation pump is connected to the oil tank, and the oil outlet of the cooler is connected to the oil tank.

[0012] In one embodiment of the present application, the loading system includes a first overflow valve and a proportional loading valve connected in series.

[0013] In one embodiment of the present application, the loading system further includes a manual loading valve, which is connected in series with the first relief valve and the proportional loading valve to form an overall parallel connection.

[0014] In one embodiment of the present application, the oil circuit system also includes a heater and a third temperature sensor. The heater is arranged in the oil tank. The third temperature sensor is used to detect the temperature of the hydraulic oil in the oil tank. The heater and the third temperature sensor are respectively communicated with the control device.

[0015] In one embodiment of the present application, the oil circuit system further includes a liquid level sensor, which is used to detect the liquid level of the hydraulic oil in the oil tank, and the liquid level sensor is communicatively connected to the control device.

[0016] In one embodiment of the present application, it also includes a delivery pump, the oil inlet of the delivery pump is connected to the first oil supply pipeline through a third oil supply pipeline, the third oil supply pipeline is provided with a sixth control valve that is communicated with the control device, the oil outlet of the delivery pump is connected to the fourth oil supply pipeline, the fourth oil supply pipeline is connected to the hydraulic pump to be tested through a first branch pipeline, the fourth oil supply pipeline is connected to the pilot controller of the hydraulic pump to be tested through a second branch pipeline, the first branch pipeline is provided with a seventh control valve, and the second branch pipeline is provided with an eighth control valve.

[0017] In one embodiment of the present application, a second one-way valve and a second overflow valve are sequentially connected in series on the fourth oil supply pipeline.

[0018] In one embodiment of the present application, a quick-assembly trolley is further included, and the hydraulic pump connection adjustment base, the oil circuit system, the loading system and the control acquisition system are arranged on the quick-assembly trolley.

[0019] 14. The 14th embodiment of the present invention relates to a hydraulic pump which is connected to a hydraulic pump and is suitable for use in conjunction with the hydraulic system of claim 13. The hydraulic pump is connected to the hydraulic pump base and an oil circuit system is provided. The hydraulic pump base is used to install the hydraulic pump to be tested; the oil circuit system includes an oil tank, a first oil supply line, a second oil supply line, an oil drain line, an open oil return line and a closed oil return line. The oil tank is used to store the hydraulic oil required for the test; the first oil supply line is used to connect the oil inlet of the hydraulic pump to be tested to the oil tank; the second oil supply line and the oil drain line are used to connect the oil port of the hydraulic pump housing to the oil tank; the first oil supply line is provided with a first control valve; the second oil supply line is provided with a second control valve; the oil drain line is provided with a third control valve; the open oil return line is provided with a fourth control valve; the closed oil return line is provided with a fourth control valve; the oil inlet line of the loading system is used to connect to ... The oil outlet of the hydraulic pump to be tested is connected, the open oil return line and the closed oil return line are connected in parallel to the oil outlet of the loading system, the open oil return line is connected to the oil tank, and the closed oil return line is connected to the oil inlet of the hydraulic pump to be tested; the control and acquisition system includes a control device, an oil leakage flowmeter arranged on the oil leakage line, an oil return flowmeter arranged at the oil outlet of the loading system, a first temperature sensor arranged on the first oil supply line, a second temperature sensor arranged on the oil inlet line of the loading system, a first pressure sensor arranged on the first oil supply line, and a second pressure sensor arranged on the oil inlet line of the loading system, and the control device is respectively communicated with the oil leakage flowmeter, the return oil flowmeter, the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the first control valve, the second control valve, the third control valve, the fourth control valve and the loading system.

[0020] Before the test is started, the above-mentioned hydraulic pump low-temperature cold start test device is placed in a low-temperature environment simulation chamber, the hydraulic pump to be tested is installed on the hydraulic pump connection adjustment base, and the hydraulic pump to be tested is connected to the drive motor through the torque meter. According to the test requirements, an open hydraulic pump or a closed hydraulic pump test circuit is built by controlling the opening and closing status of each control valve. During the test, the drive motor controls the speed of the hydraulic pump to be tested, and the loading system realizes pressure control. In this way, the working environment and the temperature of the working medium of the hydraulic pump to be tested can be simulated by relying on the low-temperature environment simulation chamber, and the cold start test evaluation of hydraulic pumps with different media, different temperatures, different displacements, different speeds and different pressures can be realized, thereby accurately verifying and evaluating the sealing performance and component wear of the hydraulic pump in a low-temperature environment. There is no need to test and verify the entire vehicle in a cold area, which helps to improve R&D testing efficiency, reduce costs and enhance product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a low-temperature cold start test device for a hydraulic pump provided in an embodiment of the present invention;

[0023] Figure 2 A hydraulic principle diagram of a low-temperature cold start test device for a hydraulic pump provided in an embodiment of the present invention;

[0024] Figure 3 A hydraulic principle diagram of an open hydraulic pump test of a hydraulic pump low-temperature cold start test device provided by an embodiment of the present invention;

[0025] Figure 4 This is a hydraulic principle diagram of a closed hydraulic pump test of a hydraulic pump low-temperature cold start test device provided by an embodiment of the present invention.

[0026] In the picture:

[0027] 1 is the hydraulic pump connection adjustment base; 2 is the oil system; 201 is the oil tank; 202 is the first oil supply line; 203 is the second oil supply line; 204 is the oil drain line; 205 is the open oil return line; 206 is the closed oil return line; 207 is the third oil supply line; 208 is the heater; 209 is the third temperature sensor; 210 is the liquid level sensor; 211 is the first control valve; 212 is the second control valve; 213 is the third control valve; 214 is the fourth control valve; 215 is the fifth control valve; 216 is the sixth control valve control valve; 217 is the fourth oil supply pipeline; 218 is the second one-way valve; 219 is the second relief valve; 220 is the seventh control valve; 221 is the eighth control valve; 3 is the loading system; 301 is the first relief valve; 302 is the proportional loading valve; 303 is the manual loading valve; 4 is the control and acquisition system; 5 is the circulating filtration system; 501 is the circulating pump; 502 is the first one-way valve; 503 is the filter; 504 is the cooler; 6 is the quick-assembly trolley; 7 is the hydraulic pump to be tested; 8 is the delivery pump; 9 is the drive motor; 10 is the torque meter. DETAILED DESCRIPTION

[0028] The core of the present invention is to provide a low-temperature cold start test device for a hydraulic pump. The structural design of the low-temperature cold start test device for a hydraulic pump enables it to accurately verify and evaluate the sealing performance and component wear of the hydraulic pump in a low-temperature environment.

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a low-temperature cold start test device for a hydraulic pump provided by an embodiment of the present invention. Figure 2 This is a hydraulic principle diagram of the low-temperature cold start test device for a hydraulic pump provided in an embodiment of the present invention.

[0031] An embodiment of the present invention discloses a hydraulic pump low-temperature cold start test device, which includes a hydraulic pump connection adjustment base 1, an oil circuit system 2, a loading system 3, and a control and acquisition system 4.

[0032] Among them, the hydraulic pump connection adjustment base 1 is used to install the hydraulic pump 7 to be tested; the oil circuit system 2 includes an oil tank 201, a first oil supply line 202, a second oil supply line 203, an oil drain line 204, an open oil return line 205 and a closed oil return line 206. The oil tank 201 is used to store the hydraulic oil required for the test, the first oil supply line 202 is used to connect the oil inlet of the hydraulic pump 7 to be tested to the oil tank 201, the second oil supply line 203 and the oil drain line 204 are used to connect the oil port of the hydraulic pump housing to the oil tank 201, the first oil supply line 202 is provided with a first control valve 211, the second oil supply line 203 is provided with a second control valve 212, the oil drain line 204 is provided with a third control valve 213, the open oil return line 205 is provided with a fourth control valve 214, and the closed oil return line 206 is provided with a fifth control valve 215.

[0033] The oil inlet pipeline of the loading system 3 is used to be connected to the oil outlet of the hydraulic pump 7 to be tested, the open oil return pipeline 205 and the closed oil return pipeline 206 are connected in parallel to the oil outlet of the loading system 3, the open oil return pipeline 205 is connected to the oil tank 201, and the closed oil return pipeline 206 is connected to the oil inlet of the hydraulic pump 7 to be tested; the control and acquisition system 4 includes a control device, an oil leakage flow meter arranged on the oil leakage pipeline 204, an oil return flow meter arranged at the oil outlet of the loading system 3, a first temperature sensor arranged on the first oil supply pipeline 202, and a device A second temperature sensor is placed in the oil inlet pipeline of the loading system 3, a first pressure sensor is provided in the first oil supply pipeline 202, and a second pressure sensor is provided in the oil inlet pipeline of the loading system 3. The control device is respectively communicated with the oil leakage flowmeter, the return oil flowmeter, the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the first control valve 211, the second control valve 212, the third control valve 213, the fourth control valve 214, the fifth control valve 215 and the loading system 3.

[0034] Compared with the prior art, the hydraulic pump low-temperature cold start test device provided in the embodiment of the present invention places the above-mentioned hydraulic pump low-temperature cold start test device in a low-temperature environment simulation chamber before the test is started, installs the hydraulic pump 7 to be tested on the hydraulic pump connection adjustment base 1, and connects the hydraulic pump 7 to be tested to the drive motor 9 through the torque meter 10. According to the test requirements, an open hydraulic pump or a closed hydraulic pump test circuit is built by controlling the opening and closing states of each control valve. During the test, the drive motor 9 controls the speed of the hydraulic pump 7 to be tested, and the loading system 3 realizes pressure control. In this way, the working environment and the temperature of the working medium of the hydraulic pump 7 to be tested can be simulated by relying on the low-temperature environment simulation chamber, and the cold start test evaluation of hydraulic pumps with different media, different temperatures, different displacements, different speeds and different pressures can be realized, thereby accurately verifying and evaluating the sealing performance and component wear of the hydraulic pump in a low-temperature environment. There is no need to test and verify the entire vehicle in a cold area, which helps to improve R&D testing efficiency, reduce costs, and enhance product competitiveness.

[0035] In one embodiment of the present application, the above-mentioned hydraulic pump low-temperature cold start test device also includes a circulation filtration system 5, which is used to circulate and filter the hydraulic oil in the oil tank 201 before the test to ensure that the cleanliness of the hydraulic oil meets the use requirements.

[0036] Specifically, if Figure 2 As shown, the circulation filtration system 5 includes a circulation pump 501, a first one-way valve 502, a filter 503 and a cooler 504 connected in series in sequence. The oil inlet of the circulation pump 501 is connected to the oil tank 201, and the oil outlet of the cooler 504 is connected to the oil tank 201. Before the test, the circulation pump 501 is started, and the circulation pump 501 draws hydraulic oil from the oil tank 201 and drives the hydraulic oil to pass through the first one-way valve 502, the filter 503 and the cooler 504 in sequence, and finally returns to the oil tank 201. The filter 503 may include one or more filters. When there are multiple filters 503, each filter 503 can be connected in series and / or in parallel. The cooler 504 is used to cool the hydraulic oil whose temperature has increased after passing through the circulation pump 501 and the filter 503.

[0037] like Figure 2 As shown, in one embodiment of the present application, the loading system 3 includes a first overflow valve 301 and a proportional loading valve 302 connected in series. The first overflow valve 301 is used to allow the hydraulic oil in the loading system 3 to overflow into the oil tank 201 when the oil pressure in the loading system 3 exceeds a limit value, thereby protecting the safety of the loading system 3.

[0038] To further optimize the above technical solution, the loading system 3 also includes a manual loading valve 303, which is connected in series with the first relief valve 301 and the proportional loading valve 302 to form an overall parallel connection. The manual loading valve 303 is used for manual loading after the proportional loading valve 302 fails, and is normally in a closed state.

[0039] like Figure 2 As shown, the oil circuit system 2 also includes a heater 208 and a third temperature sensor 209. The heater 208 is arranged in the oil tank 201. The third temperature sensor 209 is used to detect the temperature of the hydraulic oil in the oil tank 201. The heater 208 and the third temperature sensor 209 are respectively communicated with the control device. During the test, the temperature of the hydraulic oil can be adjusted by the heater 208 and the third temperature sensor 209 to meet the test requirements.

[0040] Further, if Figure 2As shown, the oil circuit system 2 also includes a liquid level sensor 210, which is used to detect the liquid level of the hydraulic oil in the oil tank 201. The liquid level sensor 210 is communicatively connected to the control device. During the test, the liquid level in the oil tank 201 is monitored by the liquid level sensor 210.

[0041] like Figure 2 As shown, the above-mentioned hydraulic pump low-temperature cold start test device also includes a delivery pump 8, which includes but is not limited to a gear pump. The oil inlet of the delivery pump 8 is connected to the first oil supply pipeline 202 through the third oil supply pipeline 207, and the third oil supply pipeline 207 is provided with a sixth control valve 216 which is communicated with the control device. The oil outlet of the delivery pump 8 is connected to the fourth oil supply pipeline 217, and the fourth oil supply pipeline 217 is connected to the hydraulic pump 7 to be tested through the first branch pipeline. The fourth oil supply pipeline 217 is connected to the pilot controller of the hydraulic pump 7 to be tested through the second branch pipeline. The first branch pipeline is provided with a seventh control valve 220, and the second branch pipeline is provided with an eighth control valve 221. The delivery pump 8 can supply oil to the hydraulic pump 7 to be tested or the pilot controller of the hydraulic pump 7 to be tested during the test.

[0042] Specifically, if Figure 2 As shown, in one embodiment of the present application, the above-mentioned fourth oil supply pipeline 217 is connected in series with a second one-way valve 218 and a second overflow valve 219. The second one-way valve 218 is used to prevent the hydraulic oil in the fourth oil supply pipeline 217 from flowing back, and the second overflow valve 219 is used to overflow the hydraulic oil in the fourth oil supply pipeline 217 to the oil tank 201 when the oil pressure in the fourth oil supply pipeline 217 exceeds the limit.

[0043] like Figure 2 As shown, the above-mentioned hydraulic pump low-temperature cold start test device also includes a quick-install trolley 6, and the hydraulic pump connection adjustment base 1, oil system 2, loading system 3 and control acquisition system 4 are arranged on the quick-install trolley 6. In this way, the various parts of the hydraulic pump low-temperature cold start test device can be integrated into one, which is convenient for the construction and replacement of the test hydraulic system, and also convenient for the transportation of the hydraulic pump low-temperature cold start test device.

[0044] The working process of the hydraulic pump low-temperature cold start test device is described in detail below in conjunction with specific implementation methods.

[0045] First, we will introduce the open hydraulic pump test, see Figure 3 , Figure 3 This is a hydraulic principle diagram of an open hydraulic pump test of a hydraulic pump low-temperature cold start test device provided by an embodiment of the present invention.

[0046] First, the preparation work before the test is carried out. The hydraulic pump low-temperature cold start test device is placed in a low-temperature environment simulation chamber. The hydraulic pump 7 to be tested is installed on the hydraulic pump connection adjustment base 1 of the hydraulic pump low-temperature cold start test device, and the hydraulic pump is connected to the torque meter 10 and the drive motor 9 arranged outside the low-temperature environment simulation chamber. The torque meter 10 monitors the torque of the drive motor 9 in real time. The drive motor 9 cooperates with the torque meter 10 to realize the speed control of the hydraulic pump 7 to be tested. Hydraulic oil is injected into the oil tank 201, and the circulation filtration system 5 is started to circulate and filter the hydraulic oil until the cleanliness of the hydraulic oil meets the requirements. Then, according to the test requirements, the state of each control valve is controlled to realize the construction of the open hydraulic pump test circuit. The open hydraulic pump test circuit is as follows Figure 3 As shown, before the test, the first control valve 211 , the second control valve 212 , the sixth control valve 216 and the eighth control valve 221 are opened to supply oil to the hydraulic pump 7 to be tested, the hydraulic pump housing, the pilot controller of the hydraulic pump and the delivery pump 8 .

[0047] Before the test begins, close the second control valve 212 and open the third control valve 213 to connect the oil drain line 204 for draining the oil from the hydraulic pump housing back to the oil tank 201. During the test, the proportional loading valve 302 is used to control the pressure of the hydraulic oil, and the starting performance of the hydraulic pump 7 to be tested needs to be confirmed at room temperature. After the starting performance meets the requirements at room temperature, adjust the temperature in the low-temperature environment simulation chamber to the test environment temperature, and ensure that the test medium hydraulic oil and the hydraulic pump 7 to be tested fully reach the preset test environment temperature. Control the hydraulic pump low-temperature cold start test device as needed, test the starting conditions under the maximum displacement no-load pressure conditions at different ambient temperatures, verify the starting conditions at low temperature, high speed and low speed, and perform control characteristic tests at low temperatures at the same time. After the above tests are completed, perform an air tightness test.

[0048] The following describes the closed hydraulic pump test, please refer to Figure 4 , Figure 4 This is a hydraulic principle diagram of a closed hydraulic pump test of a hydraulic pump low-temperature cold start test device provided by an embodiment of the present invention.

[0049] The preparation work for the closed hydraulic pump test is basically the same as that for the open hydraulic pump test, so I will not go into details. Then, according to the test requirements, the closed hydraulic pump test circuit is built by controlling the state of each control valve, such as Figure 4As shown, before the test, the first control valve 211, the second control valve 212, the sixth control valve 216 and the seventh control valve 220 are opened to supply oil to the hydraulic pump 7, the hydraulic pump housing and the delivery pump 8 to be tested. Before the test starts, the second control valve 212 is closed and the third control valve 213 is opened to make the oil drain line 204 conductive for draining oil from the hydraulic pump housing back to the oil tank 201. During the test, the pressure of the hydraulic oil is controlled by the proportional loading valve 302, the fifth control valve 215 is opened, and the fourth control valve 214 is closed to form a closed hydraulic pump test circuit.

[0050] During the test, the pressure control of the hydraulic oil is achieved through the proportional loading valve 302, and the starting performance of the hydraulic pump 7 to be tested needs to be confirmed at room temperature. After the starting performance at room temperature meets the requirements, the temperature in the low-temperature environment simulation chamber is adjusted to the test environment temperature, and it is ensured that the test medium hydraulic oil and the hydraulic pump 7 to be tested fully reach the preset test environment temperature. The hydraulic pump low-temperature cold start test device is controlled according to demand, and the starting conditions under the maximum displacement no-load pressure conditions at different ambient temperatures are tested. The starting conditions at low temperature, high speed and low speed are verified, and the control characteristic test at low temperature is carried out at the same time. After the above tests are completed, an air tightness test is carried out.

[0051] It can be seen that the present application can simulate the temperature of the working environment and the working medium through the low-temperature environment simulation chamber. The quick-assembly trolley 6 is convenient for testing the construction and replacement of the hydraulic system. Through the control of various control valves, it can meet the single-pump and double-pump tests of open hydraulic pumps and closed hydraulic pumps, and realize the cold start test evaluation, sealing performance and component wear verification evaluation of hydraulic pumps with different media, different temperatures, different displacements, different speeds and different pressures. There is no need to test and verify the entire vehicle in cold areas, which improves the R&D test efficiency, reduces costs, and enhances product competitiveness.

[0052] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0053] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A hydraulic pump low temperature cold start test device, characterized in that: include: Hydraulic pump connection adjustment base, used to install the hydraulic pump to be tested; An oil circuit system comprising an oil tank, a first oil supply line, a second oil supply line, an oil drain line, an open oil return line, and a closed oil return line, wherein the oil tank is used to store the hydraulic oil required for the test, the first oil supply line is used to connect the oil inlet of the hydraulic pump to be tested to the oil tank, the second oil supply line and the oil drain line are used to connect the oil port of the hydraulic pump housing of the hydraulic pump to be tested to the oil tank, the first oil supply line is provided with a first control valve, the second oil supply line is provided with a second control valve, the oil drain line is provided with a third control valve, the open oil return line is provided with a fourth control valve, and the closed oil return line is provided with a fifth control valve; A loading system, wherein the oil inlet pipeline of the loading system is used to be connected to the oil outlet of the hydraulic pump to be tested, the open oil return pipeline and the closed oil return pipeline are connected in parallel to the oil outlet of the loading system, the open oil return pipeline is connected to the oil tank, and the closed oil return pipeline is connected to the oil inlet of the hydraulic pump to be tested; a control and acquisition system, comprising a control device, an oil leakage flowmeter provided on the oil leakage pipeline, an oil return flowmeter provided on the oil outlet of the loading system, a first temperature sensor provided on the first oil supply pipeline, a second temperature sensor provided on the oil inlet pipeline of the loading system, a first pressure sensor provided on the first oil supply pipeline, and a second pressure sensor provided on the oil inlet pipeline of the loading system, wherein the control device is communicatively connected to the oil leakage flowmeter, the oil return flowmeter, the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the loading system, respectively; A delivery pump, the oil inlet of the delivery pump is connected to the first oil supply pipeline through a third oil supply pipeline, the third oil supply pipeline is provided with a sixth control valve which is communicatively connected to the control device, the oil outlet of the delivery pump is connected to the fourth oil supply pipeline, the fourth oil supply pipeline is connected to the hydraulic pump to be tested through a first branch pipeline, the fourth oil supply pipeline is connected to the pilot controller of the hydraulic pump to be tested through a second branch pipeline, the first branch pipeline is provided with a seventh control valve, and the second branch pipeline is provided with an eighth control valve.

2. The hydraulic pump low-temperature cold start test device according to claim 1, characterized in that: It also includes a circulation filtering system, which is used for circulating and filtering the hydraulic oil in the oil tank.

3. The hydraulic pump low-temperature cold start test device according to claim 2, characterized in that: The circulation filtration system includes a circulation pump, a first one-way valve, a filter and a cooler connected in series. The oil inlet of the circulation pump is connected to the oil tank, and the oil outlet of the cooler is connected to the oil tank.

4. The hydraulic pump low-temperature cold start test device according to any one of claims 1 to 3, characterized in that: The loading system includes a first overflow valve and a proportional loading valve connected in series.

5. The hydraulic pump low-temperature cold start test device according to claim 4, characterized in that: The loading system further includes a manual loading valve, which is connected in series with the first relief valve and the proportional loading valve to form an overall parallel connection.

6. The hydraulic pump low-temperature cold start test device according to any one of claims 1 to 3, characterized in that: The oil circuit system also includes a heater and a third temperature sensor. The heater is arranged in the oil tank. The third temperature sensor is used to detect the temperature of the hydraulic oil in the oil tank. The heater and the third temperature sensor are respectively connected to the control device for communication.

7. The hydraulic pump low-temperature cold start test device according to any one of claims 1 to 3, characterized in that: The oil circuit system further includes a liquid level sensor, which is used to detect the liquid level of the hydraulic oil in the oil tank. The liquid level sensor is communicatively connected to the control device.

8. The hydraulic pump low-temperature cold start test device according to any one of claims 1 to 3, characterized in that: The fourth oil supply pipeline is connected in series with a second one-way valve and a second overflow valve.

9. The hydraulic pump low-temperature cold start test device according to any one of claims 1 to 3, characterized in that: It also includes a quick-install trolley, and the hydraulic pump is connected to the adjustment base, the oil system, the loading system and the control and acquisition system are arranged on the quick-install trolley.

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