阅读说明：本技术 一种液压缸内泄漏量快速精确测试系统及其测试方法 (Rapid and accurate test system and test method for internal leakage amount of hydraulic cylinder ) 是由 钟爱生 于 2020-06-18 设计创作，主要内容包括：本发明公布一种液压缸内泄漏量快速精确测试系统及其测试方法,属于液压缸检测设备。包括低压运行控制模块、高压加载控制模块、内泄漏测试模块I、内泄漏测试模块II和被试缸；所述低压运行控制模块连接被试缸的有杆腔和无杆腔,低压运行控制模块为被试缸提供低压大流量动力油；所述高压加载控制模块分别连接内泄漏测试模块I、内泄漏测试模块II,内泄漏测试模块I连接被试缸的有杆腔,内泄漏测试模块II连接被试缸的无杆腔,高压加载控制模块为被试缸提供高压小流量动力油。本发明液压原理新颖、功能完善,能够实现液压缸内泄漏量快速精确测量；通用性较强,对于其他类似产品设计具有借鉴意义。(The invention discloses a quick and accurate test system and a test method for internal leakage of a hydraulic cylinder, and belongs to hydraulic cylinder detection equipment. The device comprises a low-pressure operation control module, a high-pressure loading control module, an internal leakage testing module I, an internal leakage testing module II and a tested cylinder; the low-pressure operation control module is connected with a rod cavity and a rodless cavity of the tested cylinder and provides low-pressure large-flow power oil for the tested cylinder; the high-pressure loading control module is respectively connected with an inner leakage testing module I and an inner leakage testing module II, the inner leakage testing module I is connected with a rod cavity of the tested cylinder, the inner leakage testing module II is connected with a rodless cavity of the tested cylinder, and the high-pressure loading control module provides high-pressure low-flow power oil for the tested cylinder. The hydraulic principle is novel, the functions are complete, and the rapid and accurate measurement of the leakage in the hydraulic cylinder can be realized; the universality is stronger, and the reference significance is provided for other similar product designs.)

1. The utility model provides a let out quick accurate test system of leakage volume in pneumatic cylinder which characterized in that:

the device comprises a low-pressure operation control module, a high-pressure loading control module, an internal leakage testing module I, an internal leakage testing module II and a tested cylinder;

the low-pressure operation control module is connected with a rod cavity and a rodless cavity of the tested cylinder and provides low-pressure large-flow power oil for the tested cylinder;

the high-pressure loading control module is respectively connected with an inner leakage testing module I and an inner leakage testing module II, the inner leakage testing module I is connected with a rod cavity of the tested cylinder, the inner leakage testing module II is connected with a rodless cavity of the tested cylinder, and the high-pressure loading control module provides high-pressure low-flow power oil for the tested cylinder.

2. The system for rapidly and accurately testing the leakage rate of the hydraulic cylinder according to claim 1, is characterized in that: the low-pressure operation control module comprises a low-pressure large-flow pump (7) driven by a motor II (6), and an oil outlet of the low-pressure large-flow pump (7) is connected with a pressure gauge II (10-2) and an electro-hydraulic reversing valve (18); the electro-hydraulic directional valve (18) is connected with a rod cavity and a rodless cavity of the tested cylinder.

3. The system for rapidly and accurately testing the leakage rate of the hydraulic cylinder according to claim 2, is characterized in that: the low-pressure operation control module further comprises an oil level and temperature meter (4), an air filter (5), an oil return filter II (3-2), a one-way valve (8), an electromagnetic overflow valve (17), a three-position four-way electromagnetic reversing valve III (14-3), a hydraulic control one-way valve VIIII (19-1) and a hydraulic control one-way valve VIIIII (19-2);

an oil inlet of the one-way valve (8) is communicated with an oil outlet of the low-pressure high-flow pump (7);

an oil inlet of the electromagnetic overflow valve (17) is communicated with an oil outlet of the one-way valve (8), and an oil outlet of the electromagnetic overflow valve (17) is communicated with an oil inlet of the return oil filter II (3-2);

an oil inlet of the electro-hydraulic reversing valve (18) is communicated with an oil outlet of the one-way valve (8), an oil return port of the electro-hydraulic reversing valve (18) is communicated with an oil inlet of an oil return filter II (3-2), an oil outlet A of the electro-hydraulic reversing valve (18) is communicated with an oil inlet of a hydraulic control one-way valve VIIII (19-1), and an oil outlet B of the electro-hydraulic reversing valve (18) is communicated with an oil inlet of a hydraulic control one-way valve VIIIII (19-2);

an oil inlet of the three-position four-way electromagnetic reversing valve III (14-3) is communicated with an oil outlet of the one-way valve (8), an oil return port of the three-position four-way electromagnetic reversing valve III (14-3) is communicated with an oil tank, an oil outlet A of the three-position four-way electromagnetic reversing valve III (14-3) is communicated with a pilot control port of the hydraulic control one-way valve (19-1), and an oil outlet B of the three-position four-way electromagnetic reversing valve III (14-3) is communicated with a pilot control port of the hydraulic control one-way valve VIIIII (19-2);

the oil outlet of the hydraulic control one-way valve VIIII (19-1) is communicated with the oil port of the rodless cavity of the tested cylinder and the oil outlet of the internal leakage testing module II;

the oil outlet of the hydraulic control one-way valve VIIIII (19-2) is communicated with the oil outlet of the rod cavity of the tested cylinder and the oil outlet of the internal leakage testing module I.

4. The system for rapidly and accurately testing the leakage rate of the hydraulic cylinder according to claim 2, is characterized in that: the high-pressure loading control module comprises a high-pressure small-flow pump (2) driven by a motor I (1), and an oil outlet of the high-pressure small-flow pump (2) is connected with a pressure gauge I (10-1), an energy accumulator (12), a two-position two-way electromagnetic ball valve (13), a three-position four-way electromagnetic directional valve I (14-1) and a three-position four-way electromagnetic directional valve II (14-2); the two-position two-way electromagnetic ball valve (13) is connected to an oil tank; the three-position four-way electromagnetic directional valve I (14-1) and the three-position four-way electromagnetic directional valve II (14-2) are correspondingly connected with the inner leakage testing module II and the inner leakage testing module I.

5. The system for rapidly and accurately testing the leakage rate of the hydraulic cylinder according to claim 4, is characterized in that: the internal leakage testing module II comprises a hydraulic control one-way valve V (15-5), a hydraulic control one-way valve VI (15-6), a hydraulic control one-way valve VII (15-7) and a hydraulic control one-way valve VIII (15-8);

the oil outlet of the hydraulic control one-way valve V (15-5) is communicated with the oil outlet of the high-pressure small-flow pump (2), the oil inlet of the hydraulic control one-way valve V (15-5) is communicated with the oil inlet of the hydraulic control one-way valve VI (15-6), and the pilot control port of the hydraulic control one-way valve V (15-5) is communicated with the pilot control port of the hydraulic control one-way valve VI (15-6) and the oil outlet B of the three-position four-way electromagnetic reversing valve I (14-1);

an oil outlet of the hydraulic control one-way valve VI (15-6) is communicated with a rodless cavity of the tested cylinder;

an oil inlet of the hydraulic control one-way valve VII (15-7) is communicated with an oil inlet of the flowmeter II (16-2), an oil outlet of the hydraulic control one-way valve VII (15-7) is communicated with an oil outlet of the high-pressure small-flow pump (2), and a pilot control port of the hydraulic control one-way valve VII (15-7) and a pilot control port of the hydraulic control one-way valve VIII (15-8) are communicated with an oil outlet A of the three-position four-way electromagnetic directional valve I (14-1);

an oil inlet of the hydraulic control one-way valve VIII (15-8) is communicated with an oil outlet of the flowmeter II (16-2), and an oil outlet of the hydraulic control one-way valve VIII (15-8) is communicated with a rodless cavity of the tested cylinder.

6. The system for rapidly and accurately testing the leakage rate of the hydraulic cylinder according to claim 5, wherein: the internal leakage testing module I comprises a hydraulic control one-way valve I (15-1), a hydraulic control one-way valve II (15-2), a hydraulic control one-way valve III (15-3) and a hydraulic control one-way valve IV (15-4);

the oil outlet of the hydraulic control one-way valve I (15-1) is communicated with the oil outlet of the high-pressure small-flow pump (2), the oil inlet of the hydraulic control one-way valve I (15-1) is communicated with the oil inlet of the hydraulic control one-way valve II (15-2), and the pilot control port of the hydraulic control one-way valve I (15-1) and the pilot control port of the hydraulic control one-way valve II (15-2) are communicated with the oil outlet B of the three-position four-way electromagnetic reversing valve II (14-2);

the oil outlet of the hydraulic control one-way valve II (15-2) is communicated with a rod cavity of the tested cylinder;

an oil inlet of the hydraulic control one-way valve III (15-3) is communicated with an oil inlet of the flowmeter I (16-1), an oil outlet of the hydraulic control one-way valve III (15-3) is communicated with an oil outlet of the high-pressure small-flow pump (2), and a pilot control port of the hydraulic control one-way valve III (15-3) and a pilot control port of the hydraulic control one-way valve IV (15-4) are communicated with an oil outlet A of the three-position four-way electromagnetic directional valve II (14-2);

an oil inlet of the hydraulic control one-way valve IV (15-4) is communicated with an oil outlet of the flowmeter I (16-1), and an oil outlet of the hydraulic control one-way valve IV (15-4) is communicated with a rod cavity of the tested cylinder.

7. The system for rapidly and accurately testing the leakage rate of the hydraulic cylinder according to claim 6, wherein: the high-pressure loading control module also comprises an oil return filter I (3-1), an overflow valve (9) and a three-position four-way electromagnetic directional valve II (14-2);

an oil inlet of the overflow valve (9) is communicated with an oil outlet of the high-pressure small-flow pump (2), and an oil outlet of the overflow valve (9) is communicated with an oil return filter I (3-1);

an oil inlet of the two-position two-way electromagnetic ball valve (13) is communicated with an oil outlet of the high-pressure small-flow pump (2), and an oil outlet of the two-position two-way electromagnetic ball valve (13) is communicated with an oil return filter I (3-1);

the oil inlet of the energy accumulator valve group (11) is communicated with the oil inlet of the energy accumulator (12) and the oil outlet of the high-pressure small-flow pump (2), and the oil outlet of the energy accumulator valve group (11) is communicated with the oil return filter I (3-1);

an oil inlet of the three-position four-way electromagnetic reversing valve I (14-1) is communicated with an oil outlet of the high-pressure small-flow pump (2), an oil return port of the three-position four-way electromagnetic reversing valve I (14-1) is communicated with an oil return oil filter I (3-1), an oil outlet A of the three-position four-way electromagnetic reversing valve I (14-1) is communicated with pilot control ports of a hydraulic control one-way valve VII (15-7) and a hydraulic control one-way valve VIII (15-8), and an oil outlet B of the three-position four-way electromagnetic reversing valve I (14-1) is communicated with pilot control ports of a hydraulic control one-way valve V (15-5) and a hydraulic control one-way valve;

an oil inlet of the three-position four-way electromagnetic reversing valve II (14-2) is communicated with an oil outlet of the high-pressure small-flow pump (2), an oil return port of the three-position four-way electromagnetic reversing valve II (14-2) is communicated with an oil return oil filter I (3-1), an oil outlet A of the three-position four-way electromagnetic reversing valve II (14-2) is communicated with pilot control ports of the hydraulic control one-way valve III (15-3) and the hydraulic control one-way valve IV (15-4), and an oil outlet B of the three-position four-way electromagnetic reversing valve II (14-2) is communicated with pilot control ports of the hydraulic control one-way valve I (15-1), the hydraulic control one-way valve II.

8. The system of claim 7 for rapidly and accurately testing the amount of leakage in a hydraulic cylinder, wherein: when the three-position four-way electromagnetic directional valve II (14-2) works at the left position, oil ways from the hydraulic control one-way valve I (15-1) and the hydraulic control one-way valve II (15-2) to the tested cylinder rod cavity in the internal leakage testing module I are opened, and oil ways from the hydraulic control one-way valve III (15-3), the flowmeter I (16-1), the hydraulic control one-way valve IV (15-4) to the tested cylinder rod cavity are closed;

when the three-position four-way electromagnetic directional valve II (14-2) works at the right position, the oil way from the hydraulic control one-way valve III (15-3), the flowmeter I (16-1) and the hydraulic control one-way valve IV (15-4) to the rod cavity of the tested cylinder in the internal leakage testing module I is opened, and the oil way from the hydraulic control one-way valve I (15-1) and the hydraulic control one-way valve II (15-2) to the rod cavity of the tested cylinder is closed.

9. The system of claim 7 for rapidly and accurately testing the amount of leakage in a hydraulic cylinder, wherein: when the three-position four-way electromagnetic directional valve I (14-1) works at the left position, an oil way from a hydraulic control one-way valve V (15-5) and a hydraulic control one-way valve VI (15-6) to a rodless cavity of the tested cylinder in the internal leakage testing module II is opened, and an oil way from the hydraulic control one-way valve VII (15-7), the flowmeter II (16-2), the hydraulic control one-way valve VIII (15-8) to the rodless cavity of the tested cylinder is closed;

when the three-position four-way electromagnetic directional valve I (14-1) works at the right position, the oil way from the hydraulic control one-way valve VII (15-7), the flowmeter II (16-2) and the hydraulic control one-way valve VIII (15-8) to the rodless cavity of the tested cylinder in the internal leakage testing module II is opened, and the oil way from the hydraulic control one-way valve V (15-5) and the hydraulic control one-way valve VI (15-6) to the rodless cavity of the tested cylinder is closed.

10. A test method of a hydraulic cylinder internal leakage amount rapid and accurate test system, which adopts the hydraulic cylinder internal leakage amount rapid and accurate test system of any one of claims 6 to 9, and comprises the following steps:

the tested cylinder does not have the test mode of the discharge capacity in the cavity of the pole:

the starting motor II (6) drives the low-pressure high-flow pump (7) to work, the electro-hydraulic reversing valve (18) reverses to the right position to work, the low-pressure high flow enters a rodless cavity of a tested cylinder through the electro-hydraulic reversing valve (18) and drives the tested cylinder to extend to the tail end of a stroke;

secondly, a starting motor I (1) drives a high-pressure small-flow pump (2) to work, a two-position two-way electromagnetic ball valve (13) is electrified to work at an upper position, and an unloading oil way is closed;

an oil inlet stop valve of the energy accumulator valve group (11) is opened, an oil return stop valve is closed, the energy accumulator (12) flushes liquid, and the constant pressure characteristic for absorbing pressure pulsation of an outlet of the pump and controlling outlet pressure of the high-pressure small-flow pump (2) is ensured;

an electromagnet at the right end of a three-position four-way electromagnetic reversing valve I (14-1) is electrified and works at the right position, an oil way from a hydraulic control one-way valve VII (15-7), a flowmeter II (16-2) and a hydraulic control one-way valve VIII (15-8) to a rodless cavity of a tested cylinder in an inner leakage test module I is driven to be opened, high-pressure power oil of a high-pressure small-flow pump (2) applies pressure to the rodless cavity of the tested cylinder, and after the pressure quickly reaches rated test pressure and is stable, a rodless inner leakage value of the tested cylinder in unit time is read through a flowmeter II (16-2) installed in a rodless cavity pressurizing end pipeline of the tested cylinder;

the tested cylinder has a rod cavity internal leakage testing mode:

the starting motor II (6) drives the low-pressure high-flow pump (7) to work, the electro-hydraulic reversing valve (18) reverses to the left position to work, the low-pressure high flow enters a rod cavity of the cylinder to be tested through the electro-hydraulic reversing valve (18), and the cylinder to be tested is driven to retract to the stroke tail end;

secondly, a starting motor I (1) drives a high-pressure small-flow pump (2) to work, a two-position two-way electromagnetic ball valve (13) is electrified to work at an upper position, and an unloading oil way is closed;

an oil inlet stop valve of the energy accumulator valve group (11) is opened, an oil return stop valve is closed, the energy accumulator (12) flushes liquid, and the constant pressure characteristic for absorbing pressure pulsation of an outlet of the pump and controlling outlet pressure of the high-pressure small-flow pump (2) is ensured;

the electromagnet at the right end of the three-position four-way electromagnetic reversing valve II (14-2) is electrified to work at the right position, an oil path from a hydraulic control one-way valve III (15-3), a flow meter I (16-1) and a hydraulic control one-way valve IV (15-4) to a rod cavity of a tested cylinder in the inner leakage test module II is driven to be opened, high-pressure power oil of the high-pressure small-flow pump (2) exerts pressure on the rod cavity of the tested cylinder, and after the pressure quickly reaches rated test pressure and is stable, the rod inner leakage value of the tested cylinder in unit time is read through the flow meter I (16-1) installed in a pipeline at the rod cavity pressurizing end of the tested cylinder.

Technical Field

The invention relates to hydraulic cylinder detection equipment, in particular to a quick and accurate test system and a test method for internal leakage of a hydraulic cylinder.

Background

When the current hydraulic cylinder industry carries out internal leakage test, the internal leakage test is generally carried out according to national standard GB/T15622-2005 hydraulic cylinder test method and industry standard JB/T10205-2010 hydraulic cylinder, and the test method comprises the following steps: inputting oil liquid into the working cavity of the tested hydraulic cylinder, pressurizing to nominal pressure, and measuring the leakage quantity of the oil liquid leaked to the unpressurized cavity through the piston. The test method requires: firstly, installing a flowmeter or a measuring cup at an oil outlet of an unpressurized cavity of a tested cylinder for measurement; and secondly, an oil port of the unpressurized cavity of the tested cylinder faces downwards, and the internally leaked hydraulic oil can flow out of the oil port of the unpressurized cavity to a flowmeter or a measuring cup at the fastest time to perform testing. If the non-pressurized cavity oil port of the tested cylinder is not downward, and the hydraulic oil leaked inwards is required to fill the non-pressurized cavity volume or partial volume (determined according to the angle of the non-pressurized cavity oil outlet of the tested cylinder) of the tested cylinder, wherein the volume is raised to the hundreds liter level (determined according to the parameters of the tested cylinder).

It can be seen that the national standard and the line standard test methods have the following problems in practical application:

because the leakage range in the commonly used oil cylinder (the cylinder diameter is 40mm in the middle and 500mm in the middle and the middle) is 0.03 ml/min-4.2 ml/min, the leakage amount in the milliliter level needs to firstly flow through the unpressurized cavity of the tested cylinder, then part or all of the volume of the unpressurized cavity of the tested cylinder is filled (according to the angle of the oil outlet of the unpressurized cavity of the tested cylinder), and then the leakage amount can flow to a flowmeter or a measuring cup through the oil port of the unpressurized cavity of the tested cylinder for detection, so that the efficiency is extremely low. According to experience, the accurate test of one oil cylinder requires 0.5 to 3 hours (according to the sealing structure and specification parameters of the tested cylinder), and the requirement of quick quality detection of batch products is severely restricted.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a system and a method for quickly and accurately testing the leakage rate in a hydraulic cylinder.

The invention is realized by the following technical scheme:

a quick and accurate test system for the internal leakage amount of a hydraulic cylinder comprises a low-pressure operation control module, a high-pressure loading control module, an internal leakage test module I, an internal leakage test module II and a tested cylinder; the low-pressure operation control module is connected with a rod cavity and a rodless cavity of the tested cylinder and provides low-pressure large-flow power oil for the tested cylinder; the high-pressure loading control module is respectively connected with an inner leakage testing module I and an inner leakage testing module II, the inner leakage testing module I is connected with a rod cavity of the tested cylinder, the inner leakage testing module II is connected with a rodless cavity of the tested cylinder, and the high-pressure loading control module provides high-pressure low-flow power oil for the tested cylinder.

It further comprises the following steps: the low-pressure operation control module comprises a low-pressure large-flow pump driven by a motor II, and an oil outlet of the low-pressure large-flow pump is connected with a pressure gauge II and an electro-hydraulic reversing valve; the electro-hydraulic reversing valve is connected with a rod cavity and a rodless cavity of the tested cylinder.

The low-pressure operation control module further comprises an oil level and temperature meter, an air filter, an oil return oil filter II, a one-way valve, an electromagnetic overflow valve, a three-position four-way electromagnetic reversing valve III, a hydraulic control one-way valve VIIII and a hydraulic control one-way valve VIIIII;

an oil inlet of the one-way valve is communicated with an oil outlet of the low-pressure high-flow pump;

an oil inlet of the electromagnetic overflow valve is communicated with an oil outlet of the one-way valve, and an oil outlet of the electromagnetic overflow valve is communicated with an oil inlet of the return oil filter II;

an oil inlet of the electro-hydraulic reversing valve is communicated with an oil outlet of the one-way valve, an oil return port of the electro-hydraulic reversing valve is communicated with an oil inlet of an oil return oil filter II, an oil outlet A of the electro-hydraulic reversing valve is communicated with an oil inlet of a hydraulic control one-way valve VIIII, and an oil outlet B of the electro-hydraulic reversing valve is communicated with an oil inlet of a hydraulic control one-way valve VIIIII;

an oil inlet of the three-position four-way electromagnetic reversing valve III is communicated with an oil outlet of the one-way valve, an oil return port of the three-position four-way electromagnetic reversing valve III is communicated with an oil tank, an oil outlet A of the three-position four-way electromagnetic reversing valve III is communicated with a pilot control port of the hydraulic control one-way valve, and an oil outlet B of the three-position four-way electromagnetic reversing valve III is communicated with a pilot control port of the hydraulic control one-way valve VIIIII;

the oil outlet of the hydraulic control one-way valve VIIII is communicated with the rodless cavity oil port of the tested cylinder and the oil outlet of the internal leakage testing module II;

and the oil outlet of the hydraulic control one-way valve VIIIII is communicated with the oil port of the rod cavity of the tested cylinder and the oil outlet of the internal leakage testing module I.

The high-pressure loading control module comprises a high-pressure small-flow pump driven by a motor I, and an oil outlet of the high-pressure small-flow pump is connected with a pressure gauge I, an energy accumulator, a two-position two-way electromagnetic ball valve, a three-position four-way electromagnetic reversing valve I and a three-position four-way electromagnetic reversing valve II; the two-position two-way electromagnetic ball valve is connected to the oil tank; the three-position four-way electromagnetic directional valve I and the three-position four-way electromagnetic directional valve II are correspondingly connected with the internal leakage testing module II and the internal leakage testing module I.

The internal leakage testing module II comprises a hydraulic control one-way valve V, a hydraulic control one-way valve VI, a hydraulic control one-way valve VII and a hydraulic control one-way valve VIII;

the oil outlet of the hydraulic control one-way valve V is communicated with the oil outlet of the high-pressure small-flow pump, the oil inlet of the hydraulic control one-way valve V is communicated with the oil inlet of the hydraulic control one-way valve VI, and the pilot control port of the hydraulic control one-way valve V is communicated with the pilot control port of the hydraulic control one-way valve VI and the oil outlet B of the three-position four-way electromagnetic reversing valve I;

an oil outlet of the hydraulic control one-way valve VI is communicated with a rodless cavity of the tested cylinder;

an oil inlet of the hydraulic control one-way valve VII is communicated with an oil inlet of the flowmeter II, an oil outlet of the hydraulic control one-way valve VII is communicated with an oil outlet of the high-pressure small-flow pump, and a pilot control port of the hydraulic control one-way valve VII and a pilot control port of the hydraulic control one-way valve VIII are communicated with an oil outlet A of the three-position four-way electromagnetic reversing valve I;

an oil inlet of the hydraulic control one-way valve VIII is communicated with an oil outlet of the flowmeter II, and an oil outlet of the hydraulic control one-way valve VIII is communicated with a rodless cavity of the tested cylinder.

The internal leakage testing module I comprises a hydraulic control one-way valve I, a hydraulic control one-way valve II, a hydraulic control one-way valve III and a hydraulic control one-way valve IV;

the oil outlet of the hydraulic control one-way valve I is communicated with the oil outlet of the high-pressure small-flow pump, the oil inlet of the hydraulic control one-way valve I is communicated with the oil inlet of the hydraulic control one-way valve II, and the pilot control port of the hydraulic control one-way valve I and the pilot control port of the hydraulic control one-way valve II are communicated with the oil outlet B of the three-position four-way electromagnetic reversing valve II;

the oil outlet of the hydraulic control one-way valve II is communicated with a rod cavity of the tested cylinder;

an oil inlet of the hydraulic control one-way valve III is communicated with an oil inlet of the flowmeter I, an oil outlet of the hydraulic control one-way valve III is communicated with an oil outlet of the high-pressure small-flow pump, and a pilot control port of the hydraulic control one-way valve III and a pilot control port of the hydraulic control one-way valve IV are communicated with an oil outlet A of the three-position four-way electromagnetic reversing valve II;

an oil inlet of the hydraulic control one-way valve IV is communicated with an oil outlet of the flowmeter I, and an oil outlet of the hydraulic control one-way valve IV is communicated with a rod cavity of the tested cylinder.

The high-pressure loading control module also comprises an oil return filter I, an overflow valve and a three-position four-way electromagnetic directional valve II;

an oil inlet of the overflow valve is communicated with an oil outlet of the high-pressure small-flow pump, and an oil outlet of the overflow valve is communicated with an oil return filter I;

an oil inlet of the two-position two-way electromagnetic ball valve is communicated with an oil outlet of the high-pressure small-flow pump, and an oil outlet of the two-position two-way electromagnetic ball valve is communicated with an oil return filter I;

the oil inlet of the energy accumulator valve bank is communicated with the oil outlet of the high-pressure small-flow pump, and the oil outlet of the energy accumulator valve bank is communicated with the oil return filter I;

an oil inlet of the three-position four-way electromagnetic reversing valve I is communicated with an oil outlet of the high-pressure small-flow pump, an oil return port of the three-position four-way electromagnetic reversing valve I is communicated with an oil return oil filter I, an oil outlet A of the three-position four-way electromagnetic reversing valve I is communicated with pilot control ports of a hydraulic control one-way valve VII and a hydraulic control one-way valve VIII, and an oil outlet B of the three-position four-way electromagnetic reversing valve I is communicated with pilot control ports of a hydraulic control one-way valve V and a;

an oil inlet of the three-position four-way electromagnetic reversing valve II is communicated with an oil outlet of the high-pressure small-flow pump, an oil return port of the three-position four-way electromagnetic reversing valve II is communicated with an oil return oil filter I, an oil outlet A of the three-position four-way electromagnetic reversing valve II is communicated with pilot control ports of the hydraulic control one-way valve III and the hydraulic control one-way valve IV, and an oil outlet B of the three-position four-way electromagnetic reversing valve II is communicated with pilot control ports of the hydraulic control one-way valve I and the hydraulic.

When the three-position four-way electromagnetic reversing valve II works at the left position, an oil way from the hydraulic control one-way valve I and the hydraulic control one-way valve II to the tested cylinder rod cavity in the internal leakage testing module I is opened, and an oil way from the hydraulic control one-way valve III, the flowmeter I, the hydraulic control one-way valve IV to the tested cylinder rod cavity is closed;

when the three-position four-way electromagnetic directional valve II works at the right position, an oil way from the hydraulic control one-way valve III, the flowmeter I and the hydraulic control one-way valve IV to the rod cavity of the tested cylinder in the internal leakage testing module I is opened, and an oil way from the hydraulic control one-way valve I and the hydraulic control one-way valve II to the rod cavity of the tested cylinder is closed.

When the three-position four-way electromagnetic reversing valve I works at the left position, an oil way from a hydraulic control one-way valve V and a hydraulic control one-way valve VI to a rodless cavity of the tested cylinder in the internal leakage testing module II is opened, and an oil way from a hydraulic control one-way valve VII, a flowmeter II, a hydraulic control one-way valve VIII to the rodless cavity of the tested cylinder is closed;

when the three-position four-way electromagnetic directional valve I works at the right position, an oil way from a hydraulic control one-way valve VII, a flowmeter II and a hydraulic control one-way valve VIII to a rodless cavity of the tested cylinder in the internal leakage testing module II is opened, and an oil way from a hydraulic control one-way valve V and a hydraulic control one-way valve VI to the rodless cavity of the tested cylinder is closed.

A test method for a hydraulic cylinder internal leakage amount rapid and accurate test system comprises the following steps:

the tested cylinder does not have the test mode of the discharge capacity in the cavity of the pole:

the starting motor II drives the low-pressure large-flow pump to work, the electro-hydraulic reversing valve reverses to work to the right, the low-pressure large flow enters a rodless cavity of the tested cylinder through the electro-hydraulic reversing valve, and the tested cylinder is driven to extend to the tail end of a stroke;

a starting motor I drives a high-pressure small-flow pump to work, a two-position two-way electromagnetic ball valve is electrified to work at an upper position, and an unloading oil way is closed;

an oil inlet stop valve of the energy accumulator valve bank is opened, an oil return stop valve is closed, the energy accumulator is flushed, and the constant pressure characteristic for absorbing pressure pulsation at the outlet of the pump and controlling the outlet pressure of the high-pressure small-flow pump is ensured;

an electromagnet at the right end of a three-position four-way electromagnetic reversing valve I is electrified and works at the right position, an oil way from a hydraulic control one-way valve VII, a flowmeter II and a hydraulic control one-way valve VIII to a rodless cavity of a tested cylinder in an inner leakage testing module I is driven to be opened, high-pressure power oil of a high-pressure small-flow pump applies pressure to the rodless cavity of the tested cylinder, and after the pressure quickly reaches rated test pressure and is stable, a rodless inner leakage value of the tested cylinder in unit time is read through the flowmeter II arranged in a rodless cavity pressurizing end pipeline of the tested cylinder;

the tested cylinder has a rod cavity internal leakage testing mode:

a starting motor II drives the low-pressure large-flow pump to work, the electro-hydraulic reversing valve reverses to a left position to work, the low-pressure large flow enters a rod cavity of the tested cylinder through the electro-hydraulic reversing valve, and the tested cylinder is driven to retract to the stroke tail end;

a starting motor I drives a high-pressure small-flow pump to work, a two-position two-way electromagnetic ball valve is electrified to work at an upper position, and an unloading oil way is closed;

an oil inlet stop valve of the energy accumulator valve bank is opened, an oil return stop valve is closed, the energy accumulator is flushed, and the constant pressure characteristic for absorbing pressure pulsation at the outlet of the pump and controlling the outlet pressure of the high-pressure small-flow pump is ensured;

the electromagnet at the right end of the three-position four-way electromagnetic reversing valve II is electrified to work at the right position, an oil path from a hydraulic control one-way valve III, a flowmeter I and a hydraulic control one-way valve IV to a rod cavity of a tested cylinder in the internal leakage test module II is driven to be opened, high-pressure power oil of a high-pressure small-flow pump applies pressure to the rod cavity of the tested cylinder, and after the pressure quickly reaches rated test pressure and is stable, the leakage value in the rod of the tested cylinder in unit time is read through the flowmeter I installed in a pipeline at the pressurizing end of the rod cavity of the tested cylinder.

The invention has the beneficial effects that: the hydraulic principle is novel, the functions are complete, and the rapid and accurate measurement of the leakage in the hydraulic cylinder can be realized; the universality is stronger, and the reference significance is provided for other similar product designs.

Drawings

FIG. 1 is a hydraulic schematic of the present invention;

in the figure: 1. a motor I, 2, a high-pressure small-flow pump 3-1, an oil return oil filter I, 3-2, an oil return oil filter II, 4, an oil level and temperature gauge 5, an air filter 6, a motor II, 7, a low-pressure large-flow pump 8, a check valve 9, an overflow valve 10-1, a pressure gauge I, 10-2, a pressure gauge II, 11, an energy accumulator valve group 12, an energy accumulator 13, a two-position two-way electromagnetic ball valve 14-1, a three-position four-way electromagnetic directional valve I, 14-2, a three-position four-way electromagnetic directional valve II,14-3, a three-position four-way electromagnetic directional valve III, 15-1, a hydraulic control check valve I, 15-2, a hydraulic control check valve II, 15-3, a hydraulic control check valve III, 15-4, a hydraulic control check valve IV, 15-5, a hydraulic control check valve V, 15-6 and a hydraulic control check valve VI, 15-7 parts of hydraulic control one-way valves VII and 15-8 parts of hydraulic control one-way valves VIII and 16-1 parts of hydraulic control one-way valves VIII and 17 parts of flow meters I and 16-2 parts of flow meters II and 17 parts of electromagnetic overflow valves 18 parts of electro-hydraulic reversing valves 19-1 parts of hydraulic control one-way valves VIIII and 19-2 parts of hydraulic control one-way valves VIIIII.

Detailed Description

The invention will be further explained with reference to the drawings.