An oil leakage recovery circuit for hydraulic hose pressure resistance testing

Abstract

This invention provides a leakage recovery circuit for hydraulic hose pressure resistance testing, including an oil supply circuit, an overflow valve, and a recovery circuit. The recovery circuit includes a recovery hydraulic pump, a first ball valve, a second filter, a third filter, and two or more oil collection tanks. The first filter is installed in each oil collection tank and is connected to the recovery hydraulic pump via the first ball valve. The recovery hydraulic pump is connected to an oil tank via the second and third filters in sequence. The filtration accuracy of the third filter is greater than that of the second filter, and the filtration accuracy of the second filter is greater than that of the first filter. The output end of the oil supply circuit is connected to the overflow valve and a test interface of the hydraulic hose located in the oil collection tank. One end of the hydraulic hose is connected to the test interface, and the other end of the hydraulic hose and the overflow valve are both connected to the oil tank. This invention can filter and recover hydraulic oil leaking from the hydraulic hose during testing for reuse.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, specifically to an oil leakage recovery circuit for hydraulic hose pressure resistance testing. Background Technology

[0002] Hydraulic transmission uses liquid (such as hydraulic oil) as the working medium and utilizes the pressure energy of the liquid to transmit power. This requires hydraulic pipelines to have a certain pressure resistance to ensure normal flow of liquid within the hydraulic pipelines without leakage. However, due to differences in manufacturing processes, it is impossible to guarantee that every hydraulic pipeline produced will reach the preset pressure resistance value and be intact. Therefore, before installing hydraulic pipelines in a hydraulic system, it is necessary to conduct a high-pressure resistance test on the hydraulic pipelines to determine whether the hydraulic pipelines can reach the preset pressure resistance.

[0003] For example, Chinese patent document No. 201821715927.3, published on June 11, 2019, discloses a hydraulic pipeline pressure resistance test circuit, including a pressure limiting protection branch and an oil pump device; the oil pump device has an oil outlet pipeline at its outlet end, the pressure limiting protection branch is connected in parallel with the oil outlet pipeline, one end of the pipeline to be tested is connected to the oil outlet pipeline, the pressure limiting protection branch is equipped with an overflow valve and a solenoid first ball valve, the control end of the overflow valve is connected to the oil outlet end of the oil pump device, the overflow end of the overflow valve is equipped with a return oil pipeline, the oil outlet end of the overflow valve is connected to the oil inlet end of the solenoid first ball valve, and the oil outlet end of the solenoid first ball valve is connected to the middle position of the oil outlet pipeline.

[0004] The aforementioned literature describes a method that connects a pressure-limiting protection branch to the oil outlet pipeline. When the pressure exceeds the maximum value set by the pressure-limiting protection branch, some hydraulic oil flows back to the oil tank from the pressure-limiting protection branch, thus preventing excessive pressure during the pressure test. This method mainly uses the on / off state of the solenoid ball valve to adjust the pressure on the pipeline under test, while the pressure relief valve is only used for pressure relief. This makes the entire pressure adjustment process relatively complex. However, it cannot collect and recover the hydraulic oil leaked due to damage to the hydraulic pipe caused by production or transportation factors during the test, resulting in resource waste and easy contamination of the test site by the leaked hydraulic oil. Utility Model Content

[0005] The purpose of this invention is to provide a leakage recovery circuit for hydraulic hose pressure resistance testing. It can perform high-pressure pressure resistance testing on hydraulic hoses and filter and recover the hydraulic oil that leaks during the test for reuse, thereby improving resource utilization and preventing leaked hydraulic oil from contaminating the test site.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an oil leakage recovery circuit for hydraulic hose pressure resistance testing, comprising an oil supply circuit, an overflow valve, and a recovery circuit. The recovery circuit includes a recovery hydraulic pump, a first ball valve, a second filter, and two or more oil collection tanks, which are separated from each other. A first filter is installed in each oil collection tank. The first filter is connected to the recovery hydraulic pump via a first ball valve. The recovery hydraulic pump is connected to the second filter, which is connected to an oil tank. The filtration accuracy of the second filter is greater than that of the first filter. The output end of the oil supply circuit is connected to one end of the overflow valve and the test interface of the hydraulic hose located in the oil collection tank. One end of the hydraulic hose is connected to the test interface, and the other end of the hydraulic hose and the other end of the overflow valve are both connected to the oil tank.

[0007] The above setup, by installing an overflow valve at the output end of the oil supply circuit, allows for setting the overflow valve pressure value according to the pressure testing requirements of different hydraulic hoses. This satisfies various hydraulic hose testing needs and prevents damage to the hydraulic hoses due to excessively high hydraulic oil pressure output from the test interface. Furthermore, placing the hydraulic hoses in the oil collection tank allows for the collection of leaking hydraulic oil during testing. The leaked oil undergoes initial filtration through a first filter within the collection tank, followed by secondary filtration through a second filter via a first ball valve and a recovery hydraulic pump. This multi-stage filtration with varying filtration precision effectively recovers the leaked hydraulic oil, removing impurities carried during testing and recovery. The recovered leaked hydraulic oil can then be returned to the oil tank for reuse, improving resource utilization and preventing contamination of the testing site.

[0008] Furthermore, it also includes a third filter, which is connected to the second filter and connected to the oil tank. The filtration accuracy of the third filter is greater than that of the second filter.

[0009] The above setup ensures reliable filtration by passing the leaked hydraulic oil through a third filter after the second filter has performed a second filtration.

[0010] Furthermore, the oil supply circuit includes a second ball valve, an oil supply hydraulic pump, and a second check valve. One end of the second ball valve is connected to the oil tank, and the other end of the second ball valve is connected to one end of the oil supply hydraulic pump. The other end of the oil supply hydraulic pump is connected to one end of the second check valve, and the other end of the second check valve is connected to one end of the relief valve and the test interface, respectively.

[0011] With the above settings, after the second ball valve is opened, the hydraulic oil in the tank can flow to the second check valve through the oil supply hydraulic pump, and then to the relief valve and the test interface. The second check valve can prevent the hydraulic oil from flowing back.

[0012] Furthermore, the oil supply hydraulic pump is connected to an external drive motor, the third end of the oil supply hydraulic pump is connected to one end of the oil drain port, and the other end of the oil drain port and the other end of the overflow valve are both connected to the oil tank.

[0013] The above setup allows the drive motor to rotate the hydraulic pump, enabling hydraulic oil from the tank to enter the oil supply circuit. By connecting a drain port to the hydraulic pump and an overflow valve to the output of the oil supply circuit, the drain port opens when the hydraulic oil pressure at the output is too high. This allows some of the hydraulic oil flowing back to the tank, providing initial local pressure relief. After passing through the second check valve, some hydraulic oil flows back to the tank via the overflow valve, further providing secondary pressure relief. Thus, the combined action of the drain port and overflow valve provides cumulative pressure relief to the hydraulic oil at the output of the oil supply circuit, preventing excessive hydraulic pressure from damaging the hydraulic hose connected to the test interface.

[0014] Furthermore, a hydraulic pressure sensor is connected to the output end of the oil supply circuit.

[0015] With the above settings, the hydraulic oil at the output end of the oil supply circuit is depressurized by the combined action of the drain port and the relief valve. The pressure value of the hydraulic pressure sensor can then be used to determine whether the hydraulic oil pressure at the output end of the oil supply circuit meets the test pressure of the hydraulic hose connected to the test interface.

[0016] Furthermore, a pressure switch is also provided in the oil collection tank. One end of the pressure switch is connected to the oil collection tank, and the other end of the pressure switch is connected to one end of the first filter. The other end of the first filter is connected to one end of the first ball valve, and the other end of the first ball valve is connected to the recovery hydraulic pump.

[0017] With the above setup, when the pressure of the leaked hydraulic oil collected in the oil collection tank reaches the pressure required to open the pressure switch, the pressure switch connects to the first filter, and then the first ball valve is opened, allowing the recovery hydraulic pump to filter and recover the leaked hydraulic oil collected in the oil collection tank.

[0018] Furthermore, the recovery hydraulic pump is connected to an external drive motor.

[0019] The above settings facilitate the rotation of the recovery hydraulic pump via the drive motor 2, thereby filtering and recovering the leaked hydraulic oil collected in the oil collection tank.

[0020] Furthermore, a first check valve is provided between the recovery hydraulic pump and the second filter. One end of the first check valve is connected to the recovery hydraulic pump, and the other end of the first check valve is connected to one end of the second filter. The other end of the second filter is connected to one end of the third filter, and the other end of the third filter is connected to the oil tank.

[0021] The above setup prevents hydraulic oil backflow during the recovery process by setting a first check valve, and allows the hydraulic oil after passing through the first check valve to be filtered sequentially through a second filter and a third filter with different filtration precisions. This allows the recovered hydraulic oil to be filtered for impurities of different sizes at each stage, and then recovered to the oil tank for reuse.

[0022] Furthermore, the oil collection tank is also equipped with a fixing frame, which is equipped with a detachable locking component. After the hydraulic hose is placed on the fixing frame, it is fixed by the locking component passing through the top of the hydraulic hose.

[0023] The above settings facilitate the fixing of the hydraulic hose in the oil collection tank to achieve high-pressure withstand testing of the hydraulic hose. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the oil supply circuit in this utility model.

[0025] Figure 2 This is a schematic diagram of the oil recovery circuit in this utility model. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-2 As shown, this utility model provides an oil leakage recovery circuit for hydraulic hose pressure resistance testing, including an oil supply circuit, an overflow valve 1, and a recovery circuit. The oil supply circuit includes a second ball valve 2, an oil supply hydraulic pump 3, and a second check valve 4. The output end of the oil supply circuit is connected to the overflow valve 1 and a test interface P1 for connecting hydraulic hoses, respectively. One end of the second ball valve 2 is connected to the oil tank 5, and the other end of the second ball valve 2 is connected to one end of the oil supply hydraulic pump 3. The other end of the oil supply hydraulic pump 3 is connected to one end of the second check valve 4. Thus, after opening the second ball valve 2, the hydraulic oil in the oil tank 5 can flow to the second check valve 4 through the oil supply hydraulic pump 3. Since the other end of the second check valve 4 is connected to one end of the overflow valve 1 and the test interface P1, the oil flows to the overflow valve 1 and the test interface P1. In this embodiment, the other end of the second check valve 4 can be connected to two or more test interfaces P1. The number of test interfaces P1 corresponds to the number of oil collection tanks 12 in the recovery circuit, so as to realize the simultaneous testing of hydraulic hoses with different pressure tests.

[0028] like Figure 1As shown, the hydraulic pump 3 is connected to an external drive motor 6. The third end of the hydraulic pump 3 is connected to one end of the drain port, and the other end of the drain port and the other end of the overflow valve 1 are both connected to the oil tank 5. In this way, the hydraulic pump 3 can be driven to rotate by the drive motor 6, thereby allowing the hydraulic oil in the oil tank 5 to enter the oil supply circuit. By setting the drain port connected to the hydraulic pump 3 and the overflow valve 1 connected to the output end of the oil supply circuit, when the hydraulic oil pressure at the output end of the oil supply circuit is too high, the drain port can be opened, allowing some of the hydraulic oil that has passed through the hydraulic pump to flow back to the oil tank 5 through the drain port, which plays a preliminary role in local pressure relief. After the hydraulic oil passes through the second check valve 4, some of the hydraulic oil can flow to the oil tank 5 through the overflow valve 1, which further plays a secondary pressure relief role. Thus, under the combined action of the drain port and the overflow valve 1, the hydraulic oil pressure at the output end of the oil supply circuit can be relieved by superposition, so as to avoid the hydraulic hose connected to the test interface P1 being damaged due to excessive hydraulic oil pressure.

[0029] like Figure 1 As shown, a hydraulic pressure sensor 7 is connected to the output end of the oil supply circuit. This allows the hydraulic oil at the output end of the oil supply circuit to be depressurized by the combined action of the drain port and the relief valve 1. The pressure value of the hydraulic pressure sensor 7 can then be used to determine whether the hydraulic oil pressure at the output end of the oil supply circuit meets the test pressure of the hydraulic hose connected to the test interface P1.

[0030] like Figure 2 As shown, the recovery oil circuit includes a recovery hydraulic pump 8, a first ball valve 9, a second filter 10, a third filter 11, and two or more oil collection tanks 12. The oil collection tanks 12 are separated from each other. A first filter 13 and a pressure switch 14 are installed in each oil collection tank 12. One end of the pressure switch 14 is connected to the oil collection tank 12, and the other end of the pressure switch 14 is connected to one end of the first filter 13. The other end of the first filter 13 is connected to one end of the first ball valve 9, and the other end of the first ball valve 9 is connected to the recovery hydraulic pump 8. In this way, when the pressure of the leaked hydraulic oil collected in the oil collection tank 12 reaches the pressure to open the pressure switch 14, the pressure switch 14 is connected to the first filter 13. Then, by opening the first ball valve 9, the recovery hydraulic pump 8 filters and recovers the leaked hydraulic oil collected in the oil collection tank 12.

[0031] like Figure 2As shown, the recovery hydraulic pump 8 is connected to an external drive motor 15, which allows the recovery hydraulic pump 8 to rotate via the drive motor 15, thereby filtering and recovering the leaked hydraulic oil collected in the oil collection tank 12. In this embodiment, a first check valve 16 is provided between the recovery hydraulic pump 8 and the second filter 10. One end of the first check valve 16 is connected to the recovery hydraulic pump 8, and the other end is connected to one end of the second filter 10. The other end of the second filter 10 is connected to one end of the third filter 11, and the other end of the third filter 11 is connected to the oil tank 5. By setting the first check valve, the backflow of hydraulic oil during the recovery process is prevented, and the hydraulic oil after passing through the first check valve 16 is recovered by sequentially passing through the second filter 10 and the third filter 11.

[0032] like Figure 2 As shown, the filtration accuracy of the third filter 11 is greater than that of the second filter 10, and the filtration accuracy of the second filter 10 is greater than that of the first filter 13. In this embodiment, the filtration accuracy of the third filter 11 is 3 micrometers (μm), the filtration accuracy of the second filter 10 is 10 micrometers (μm), and the filtration accuracy of the third filter 11 is 100 micrometers (μm). The smaller the value of the filtration accuracy, the higher the filtration accuracy. In this way, the leaked hydraulic oil can be filtered with different filtration accuracy through the recovery oil circuit, so that the recovered hydraulic oil can be filtered for impurities of different sizes step by step, and then recovered to the oil tank 5 for reuse, thereby improving the utilization rate of hydraulic oil and avoiding the leakage of hydraulic oil from contaminating the test site.

[0033] like Figure 2 As shown, a fixing frame is also provided in the oil collection tank 12. The fixing frame is equipped with a detachable locking component. After the hydraulic hose is placed on the fixing frame, it is fixed by the locking component passing through the top of the hydraulic hose. In this embodiment, the locking component is a bolt. The fixing frame is provided with fixing holes corresponding to the bolts. The bolts are used to achieve a detachable connection with the fixing frame. One end of the hydraulic hose is connected to the test interface P1, and the other end of the hydraulic hose is connected to the oil tank 5, so as to facilitate fixing the hydraulic hose in the oil collection tank 12 to realize the high pressure withstand test of the hydraulic hose.

[0034] The working principle of this utility model is as follows: The hydraulic hose is fixed on the fixing frame in the oil collection tank 12 and connected to the test interface P1 connected to the oil supply line output end. Then, the pressure value of the overflow valve 1 is adjusted according to the pressure test requirements of different hydraulic hoses to meet the different hydraulic hose tests, so as to avoid the hydraulic oil output pressure of the test interface P1 being too high and damaging the hydraulic hose. During the test, the hydraulic oil leaking from the hydraulic hose is collected through the oil collection tank 12. During the recovery of the leaked hydraulic oil, the first filter 13 in the oil collection tank 12 performs the first filtration. Through the joint action of the first ball valve 9 and the recovery hydraulic pump 8, the recovered leaked hydraulic oil is filtered a second time through the second filter 10. Then, the recovered leaked hydraulic oil is filtered again through the third filter 11. In this way, the leaked hydraulic oil is recovered through multi-stage filtration with different filtration precision, thereby effectively removing the impurities carried by the leaked hydraulic oil during the test and recovery process, so that the recovered leaked hydraulic oil can flow back to the oil tank 5 for reuse, improving resource utilization, and avoiding the leakage of hydraulic oil from polluting the test site.

Claims

1. A leakage recovery circuit for hydraulic hose pressure resistance testing, characterized in that: It includes an oil supply circuit, an overflow valve, and a recovery oil circuit. The recovery oil circuit includes a recovery hydraulic pump, a first ball valve, a second filter, and two or more oil collection tanks. The oil collection tanks are separated from each other. The first filter is installed in the oil collection tank. The first filter is connected to the recovery hydraulic pump through the first ball valve. The recovery hydraulic pump is connected to the second filter. The second filter is connected to the oil tank. The filtration accuracy of the second filter is greater than that of the first filter. The output end of the oil supply circuit is connected to the overflow valve and the test interface of the hydraulic hose installed in the oil collection tank. One end of the hydraulic hose is connected to the test interface, and the other end of the hydraulic hose and the overflow valve are both connected to the oil tank.

2. The oil leakage recovery circuit for hydraulic hose pressure resistance testing according to claim 1, characterized in that: It also includes a third filter, which is connected to the second filter and connected to the oil tank. The filtration accuracy of the third filter is greater than that of the second filter.

3. The oil leakage recovery circuit for hydraulic hose pressure resistance testing according to claim 1, characterized in that: The oil supply circuit includes a second ball valve, an oil supply hydraulic pump, and a second check valve. One end of the second ball valve is connected to the oil tank, and the other end of the second ball valve is connected to one end of the oil supply hydraulic pump. The other end of the oil supply hydraulic pump is connected to one end of the second check valve, and the other end of the second check valve is connected to one end of the relief valve and the test interface, respectively.

4. The oil leakage recovery circuit for hydraulic hose pressure resistance testing according to claim 3, characterized in that: The oil supply hydraulic pump is connected to an external drive motor. The third end of the oil supply hydraulic pump is connected to one end of the oil drain port, and the other end of the oil drain port and the other end of the overflow valve are both connected to the oil tank.

5. The oil leakage recovery circuit for hydraulic hose pressure resistance testing according to claim 3, characterized in that: A hydraulic pressure sensor is connected to the output end of the oil supply circuit.

6. The oil leakage recovery circuit for hydraulic hose pressure resistance testing according to claim 1, characterized in that... The oil collection tank is also equipped with a pressure switch. One end of the pressure switch is connected to the oil collection tank, and the other end of the pressure switch is connected to one end of the first filter. The other end of the first filter is connected to one end of the first ball valve, and the other end of the first ball valve is connected to the recovery hydraulic pump.

7. The oil leakage recovery circuit for hydraulic hose pressure resistance testing according to claim 1, characterized in that: The recovery hydraulic pump is connected to an external drive motor.

8. The oil leakage recovery circuit for hydraulic hose pressure resistance testing according to claim 1, characterized in that: A first check valve is provided between the recovery hydraulic pump and the second filter. One end of the first check valve is connected to the recovery hydraulic pump, and the other end of the first check valve is connected to one end of the second filter. The other end of the second filter is connected to one end of the third filter, and the other end of the third filter is connected to the oil tank.

9. The oil leakage recovery circuit for hydraulic hose pressure resistance testing according to claim 1, characterized in that: The oil collection tank is also equipped with a fixing frame, which has a detachable locking component. After the hydraulic hose is placed on the fixing frame, it is fixed by the locking component passing through the top of the hydraulic hose.

Images