Loading test device of hydraulic element large-flow test bed

Abstract

The utility model discloses a loading test device of a hydraulic element large-flow test bed, which comprises a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve, a first pressure sensor and a second pressure sensor, and a first oil pipe is fixedly arranged between the input end of the first one-way valve and the output end of the third one-way valve. And a second oil pipe is fixedly mounted between the input end of the second one-way valve and the output end of the fourth one-way valve. In the testing process of the open plunger pump, as the pressure oil port is always unidirectional, the open plunger pump can be connected in series with the first oil pipe or the second oil pipe, and the first pressure sensor and the second pressure sensor can be interlocked with the proportional overflow valve to form closed-loop control. Stepless regulation is achieved on the loading pressure, so that the loading test of the open plunger pump or the closed plunger pump is completed, and the flow meter can monitor the oil return flow.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic component testing, and particularly relates to a loading test device for a large-flow test bench of hydraulic components. Background Technique

[0002] The plunger pump is an important working component in hydraulic and pneumatic transmissions. It belongs to the positive displacement pump and reciprocating pump. The plunger pump relies on the reciprocating movement of the plunger in the cylinder block to change the volume of the sealed working chamber to achieve oil suction and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, and convenient flow regulation. It is widely used in occasions such as hydraulic presses, construction machinery, and ships that require high pressure, large flow, and flow regulation. At present, during the production of plunger pumps, it is often necessary to conduct a loading test on hydraulic components. Due to the different oil port directions of open-type plunger pumps and closed-type plunger pumps, during the test process, the staff needs to replace the position of the pressure oil port according to the test requirements of two different types of plunger pumps. The overall operation is relatively cumbersome and causes great inconvenience to the work of the staff. Content of the Utility Model

[0003] The purpose of the utility model is to provide a loading test device for a large-flow test bench of hydraulic components, which has the advantages of facilitating the staff to conduct loading tests on open-type plunger pumps and closed-type plunger pumps, with convenient and fast overall operation, and bringing great convenience to the work of the staff.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A loading test device for a large-flow test bench of hydraulic components, including a first check valve, a second check valve, a third check valve, a fourth check valve, a first pressure sensor, and a second pressure sensor. A first oil pipe is fixedly installed between the input end of the first check valve and the output end of the third check valve. A second oil pipe is fixedly installed between the input end of the second check valve and the output end of the fourth check valve. A flow meter, a two-way cartridge valve, and a reversing valve are sequentially fixedly installed through a pipeline between the input ends of the third check valve and the fourth check valve. A first filter and a two-way pressure cartridge valve are sequentially fixedly installed through a pipeline between the output end of the first check valve and the output end of the second check valve. An integrated block is communicated with the bottom of the first filter and the bottom of the two-way pressure cartridge valve through an oil passage. The integrated block includes a relief valve and a proportional relief valve. A second filter is fixedly installed through a pipeline between the right side of the two-way pressure cartridge valve and the left side of the flow meter.

[0005] As a preferred solution, the relief valve and the proportional relief valve are communicated with the two-way pressure cartridge valve through an oil passage.

[0006] As a preferred solution, the bottom of the two-way cartridge valve is fixedly installed on the top of the reversing valve through an oil circuit block, and a fuel tank pipeline is fixedly installed on the right side of the two-way cartridge valve.

[0007] As a preferred solution, the first pressure sensor is communicated with the first oil pipe, and the second pressure sensor is communicated with the second oil pipe.

[0008] As a preferred solution, the first filter is a high-pressure filter, and the second filter is a low-pressure filter.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0010] 1. During the test of the open-type piston pump of the present utility model, since the pressure oil ports are often unidirectional, the open-type piston pump can be selected to be connected in series with the first oil pipe or the second oil pipe. The first pressure sensor and the second pressure sensor can be interlocked with the proportional relief valve to form a closed-loop control, realizing stepless adjustment of the loading pressure, so as to complete the loading test of the open-type piston pump; during the test of the closed-type piston pump, the pressure oil ports are often bidirectional, and the two pressure oil ports need to be converted with each other. Therefore, the loading circuit needs to have the function of oil port interchange, and rectification can be realized through the first check valve, the second check valve, the third check valve and the fourth check valve. During the loading test, only the two pressure oil ports of the closed-type piston pump need to be connected to the first oil pipe and the second oil pipe to carry out the loading test. The first pressure sensor and the second pressure sensor can be interlocked with the proportional relief valve to form a closed-loop control, realizing stepless adjustment of the loading pressure, so as to complete the loading test of the closed-type piston pump.

[0011] 2. Through the setting of the oil tank pipeline of the present utility model, it is convenient to connect the b end of the two-way cartridge valve with the external hydraulic oil tank. Through the setting of the first pressure sensor and the second pressure sensor, the hydraulic oil pressure inside the first oil pipe and the second oil pipe can be monitored respectively, so as to facilitate the personnel to obtain the pressure data in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the hydraulic schematic diagram of the loading test of the present utility model.

[0013] In the figure: 1. First pressure sensor; 2. Second pressure sensor; 3. First check valve; 4. Second check valve; 5. Third check valve; 6. Fourth check valve; 7. First filter; 8. Two-way pressure cartridge valve; 9. Relief valve; 10. Proportional relief valve; 11. Second filter; 12. Flowmeter; 13. Two-way cartridge valve; 14. Directional valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0015] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an independent or selectively mutually exclusive embodiment with other embodiments.

[0016] Embodiment 1:

[0017] Please refer to Figure 1 As shown, the present invention provides a loading test device for a large-flow test bench of hydraulic components, including a first check valve 3, a second check valve 4, a third check valve 5, a fourth check valve 6, a first pressure sensor 1 and a second pressure sensor 2. A first oil pipe is fixedly installed between the input end of the first check valve 3 and the output end of the third check valve 5. A second oil pipe is fixedly installed between the input end of the second check valve 4 and the output end of the fourth check valve 6. A flow meter 12, a two-way cartridge valve 13 and a reversing valve 14 are fixedly installed in sequence through a pipeline between the input ends of the third check valve 5 and the fourth check valve 6. A first filter 7 and a two-way pressure cartridge valve 8 are fixedly installed in sequence through a pipeline between the output end of the first check valve 3 and the output end of the second check valve 4. An integrated block is communicated with an oil passage between the bottom of the first filter 7 and the bottom of the two-way pressure cartridge valve 8. The integrated block includes a relief valve 9 and a proportional relief valve 10. A second filter 11 is fixedly installed through a pipeline between the right side of the two-way pressure cartridge valve 8 and the left side of the flow meter 12.

[0018] In this technical solution, during the testing of an open-type piston pump, since the pressure oil ports are often unidirectional, the open-type piston pump can be selected to be connected in series to the first oil pipe or the second oil pipe. The first pressure sensor 1 and the second pressure sensor 2 can be interlocked with the proportional relief valve 10 to form a closed-loop control, enabling stepless adjustment of the loading pressure, thereby completing the loading test of the open-type piston pump. During the testing of a closed-type piston pump, the pressure oil ports are often bidirectional and need to be switched with each other. Therefore, the loading circuit needs to have an oil port interchange function, which can be achieved through the first check valve 3, the second check valve 4, the third check valve 5, and the fourth check valve 6 for rectification. During the loading test, only the two pressure oil ports of the closed-type piston pump need to be connected to the first oil pipe and the second oil pipe to conduct the loading test. The first pressure sensor 1 and the second pressure sensor 2 can be interlocked with the proportional relief valve 10 to form a closed-loop control, enabling stepless adjustment of the loading pressure, thereby completing the loading test of the closed-type piston pump.

[0019] Embodiment 2:

[0020] Based on Embodiment 1, as shown in the present utility model Figure 1 The relief valve 9 and the proportional relief valve 10 are connected and communicated through an oil passage and a two-way pressure cartridge valve 8. The bottom of the two-way cartridge valve 13 is fixedly installed on the top of the directional control valve 14 through an oil circuit block. A fuel tank pipeline is fixedly installed on the right side of the two-way cartridge valve 13. The first pressure sensor 1 is connected and communicated with the first oil pipe, the second pressure sensor 2 is connected and communicated with the second oil pipe, the first filter 7 is a high-pressure filter, and the second filter 11 is a low-pressure filter.

[0021] In this technical solution, through the setting of the fuel tank pipeline, it is convenient to connect the b end of the two-way cartridge valve 13 to the external hydraulic fuel tank. Through the setting of the first pressure sensor 1 and the second pressure sensor 2, the hydraulic oil pressure inside the first oil pipe and the second oil pipe can be monitored respectively, so that personnel can obtain pressure data in a timely manner.

[0022] The working principle of the present utility model is as follows: During the testing of an open-type piston pump, since the pressure oil port is often unidirectional, the open-type piston pump can be connected in series to the first oil pipe or the second oil pipe. When the open-type piston pump is connected in series with the first oil pipe, the output hydraulic oil can flow into the first filter 7, the overflow valve 9 (used to protect the pressure of the entire system), the proportional overflow valve 10, and the a and c ends of the two-way pressure cartridge valve 8 in sequence through the first oil pipe and the first one-way valve 3. When the pressure of the hydraulic oil reaches the set value of the proportional overflow valve 10, the a and b ends of the two-way pressure cartridge valve 8 can be connected and opened, so that the hydraulic oil can be transported to the reversing valve 14 through the a and b ends of the two-way pressure cartridge valve 8, the overflow valve 9, the proportional overflow valve 10, the second filter 11, and the flowmeter 12, and under the action of the connection of the reversing valve 14, the a and b ends of the two-way cartridge valve 13 can be connected and opened, so that the hydraulic oil can flow into the external hydraulic oil tank through the a and b ends of the two-way cartridge valve 13. When the open-type piston pump is connected in series with the second oil pipe, the output hydraulic oil can flow into the first filter 7, the overflow valve 9 (used to protect the pressure of the entire system), the proportional overflow valve 10, and the a and c ends of the two-way pressure cartridge valve 8 in sequence through the second oil pipe and the second one-way valve 4. When the pressure of the hydraulic oil reaches the set value of the proportional overflow valve 10, the a and b ends of the two-way pressure cartridge valve 8 can be connected and opened, so that the hydraulic oil can be transported to the reversing valve 14 through the a and b ends of the two-way pressure cartridge valve 8, the overflow valve 9, the proportional overflow valve 10, the second filter 11, and the flowmeter 12, and under the action of the connection of the reversing valve 14, the a and b ends of the two-way cartridge valve 13 can be connected and opened, so that the hydraulic oil can flow into the external hydraulic oil tank through the a and b ends of the two-way cartridge valve 13, thus achieving the effect of conducting a loading test on the open-type piston pump. (Note: When the first oil port admits oil during the open pump test, the second oil port is blocked, and vice versa.)

[0023] During the test of a closed - type piston pump, since the pressure oil ports are often bidirectional and need to be switched between each other, the two groups of pressure oil ports on the closed - type piston pump can be connected to the first oil pipe and the second oil pipe: When the hydraulic oil is output from the first oil pipe, the hydraulic oil can flow through the first one - way valve 3 and then into the first filter 7, the overflow valve 9 (used to protect the pressure of the whole system), the proportional overflow valve 10, and the a - end and c - end of the two - way pressure cartridge valve 8 in sequence. When the pressure of the hydraulic oil reaches the set value of the proportional overflow valve 10, the a - end and b - end of the two - way pressure cartridge valve 8 can be connected and opened, so that the hydraulic oil can pass through the a - end and b - end of the two - way pressure cartridge valve 8, the overflow valve 9, the proportional overflow valve 10, the second filter 11, and the flowmeter 12 and be delivered to the reversing valve 14. Since the reversing valve 14 is closed at this time, the a - end and b - end of the two - way cartridge valve 13 cannot be connected and opened, and thus the oil can flow back to the inside of the closed - type piston pump through the fourth one - way valve 6 and the second oil pipe; When the hydraulic oil is output from the second oil pipe, the hydraulic oil can flow through the second one - way valve 4 and then into the first filter 7, the overflow valve 9 (used to protect the pressure of the whole system), the proportional overflow valve 10, and the a - end and c - end of the two - way pressure cartridge valve 8 in sequence. When the pressure of the hydraulic oil reaches the set value of the proportional overflow valve 10, the a - end and b - end of the two - way pressure cartridge valve 8 can be connected and opened, so that the hydraulic oil can pass through the a - end and b - end of the two - way pressure cartridge valve 8, the overflow valve 9, the proportional overflow valve 10, the second filter 11, and the flowmeter 12 and be delivered to the reversing valve 14. Since the reversing valve 14 is closed at this time, the a - end and b - end of the two - way cartridge valve 13 cannot be connected and opened, and thus the hydraulic oil can flow back to the inside of the closed - type piston pump through the third one - way valve 5 and the first oil pipe, thereby achieving the effect of conducting a loading test on the closed - type piston pump.

[0024] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (e.g., changes in the dimensions, scales, structures, shapes and proportions of various elements, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, colors, orientations, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Accordingly, all such modifications are intended to be included within the scope of the present utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structures that perform the recited function described herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present utility model. Therefore, the present utility model is not limited to specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0025] In addition, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiments may not be described (i.e., those features that are not relevant to the currently considered best mode of carrying out the present utility model or those features that are not relevant to the implementation of the present utility model).

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit the protection scope of the present utility model. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model may be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present utility model.

Claims

1. A loading test device for a hydraulic component large flow test bench, comprising a first one-way valve (3), a second one-way valve (4), a third one-way valve (5), a fourth one-way valve (6), a first pressure sensor (1) and a second pressure sensor (2), characterized in that: A first oil pipe is fixedly installed between the input end of the first one-way valve (3) and the output end of the third one-way valve (5), a second oil pipe is fixedly installed between the input end of the second one-way valve (4) and the output end of the fourth one-way valve (6), a flow meter (12), a two-way cartridge valve (13) and a reversing valve (14) are fixedly installed in sequence between the input end of the third one-way valve (5) and the input end of the fourth one-way valve (6) through a pipeline, a first filter (7) and a two-way pressure cartridge valve (8) are fixedly installed in sequence between the output end of the first one-way valve (3) and the output end of the second one-way valve (4) through a pipeline, an integrated block is connected between the bottom of the first filter (7) and the bottom of the two-way pressure cartridge valve (8) through an oil passage, the integrated block comprises a relief valve (9) and a proportional relief valve (10), and a second filter (11) is fixedly installed between the right side of the two-way pressure cartridge valve (8) and the left side of the flow meter (12) through a pipeline.

2. The loading test device of a hydraulic component large flow test bench according to claim 1 is characterized in that: The relief valve (9) is connected to the proportional relief valve (10) via an oil passage and a two-way pressure cartridge valve (8).

3. The loading test device of a hydraulic component large flow test bench according to claim 1 is characterized in that: The bottom of the two-way cartridge valve (13) is fixedly mounted on the top of the reversing valve (14) via an oil circuit block, and an oil tank pipeline is fixedly mounted on the right side of the two-way cartridge valve (13).

4. The loading test device of a hydraulic component large flow test bench according to claim 1 is characterized in that: The first pressure sensor (1) is connected to a first oil pipe, and the second pressure sensor (2) is connected to a second oil pipe.

5. The loading test device of a hydraulic component large flow test bench according to claim 1 is characterized in that: The first filter (7) is a high-pressure filter, and the second filter (11) is a low-pressure filter.

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