CN215639980U - Internal leakage quantity measuring device for hydraulic element - Google Patents
Internal leakage quantity measuring device for hydraulic element Download PDFInfo
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- CN215639980U CN215639980U CN202121807816.7U CN202121807816U CN215639980U CN 215639980 U CN215639980 U CN 215639980U CN 202121807816 U CN202121807816 U CN 202121807816U CN 215639980 U CN215639980 U CN 215639980U
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Abstract
The utility model provides a device for measuring the internal leakage amount of a hydraulic element. The device comprises an oil inlet pipe and a test oil pipe which are respectively connected with an oil inlet and an oil outlet of a hydraulic element to be tested; one end of the test oil pipe, which is far away from the hydraulic element to be tested, is connected with the hydraulic oil tank; the testing oil pipe is provided with a first control valve and a second control valve, and a magnetostrictive liquid level sensor is arranged between the first control valve and the second control valve and used for detecting the internal leakage amount of the hydraulic element to be tested. According to the utility model, the magnetostrictive liquid level sensor is arranged in the hydraulic component internal leakage amount measuring device, so that the liquid level change caused by the internal leakage of the hydraulic component can be accurately detected, and the measuring precision of the internal leakage of the hydraulic component is improved.
Description
Technical Field
The utility model relates to the field of detection devices, in particular to a device for measuring the internal leakage amount of a hydraulic element.
Background
At present, the measurement of the internal leakage of a hydraulic cylinder and a hydraulic valve is commonly used by a measuring cup, taking the hydraulic cylinder as an example, when the internal leakage of the hydraulic cylinder is measured by the measuring cup, a piston of the hydraulic cylinder to be measured is fixed at one end of the stroke of the hydraulic cylinder, the pressure of an experimental cavity of the hydraulic cylinder to be measured is adjusted to a rated test pressure value (or pressure designated by a user), the hydraulic oil flowing out is received by the measuring cup at the oil outlet at the other side of the hydraulic cylinder, meanwhile, the time of the flowing-out oil is recorded by a stopwatch, and the flow in unit time is calculated to be the leakage in the hydraulic cylinder, but the measuring cup measurement method has the following defects:
firstly, a certain error exists when the liquid level scale in the measuring cup is observed by naked eyes of people, and the measuring accuracy is not high;
secondly, when the internal leakage is small, the oil drops are discontinuously dropped, so that certain measurement errors are caused in time calculation.
In the prior art, when the internal leakage amount is measured by the machine vision detection technology, a professional is required to debug, the operation is complex, the accuracy of the internal leakage amount detection by the machine vision detection technology is limited, and the production cost of the test system is high.
In view of the above, there is a need for an apparatus for measuring the amount of leakage in a hydraulic component to solve the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a device for measuring the internal leakage amount of a hydraulic element, which aims to solve the problem that the detection accuracy of the internal leakage amount of the existing hydraulic element is not high.
In order to achieve the purpose, the utility model provides a hydraulic element internal leakage measuring device which comprises an oil inlet pipe and a test oil pipe, wherein the oil inlet pipe and the test oil pipe are respectively connected with an oil inlet and an oil outlet of a hydraulic element to be tested; one end of the test oil pipe, which is far away from the hydraulic element to be tested, is connected with the hydraulic oil tank; the testing oil pipe is provided with a first control valve and a second control valve, and a magnetostrictive liquid level sensor is arranged between the first control valve and the second control valve and used for detecting the internal leakage amount of the hydraulic element to be tested.
Preferably, the magnetostrictive liquid level sensor comprises a detection pipe body, a detection rod, a floater and a signal processing module; the detection pipe body is vertically arranged and communicated with the test oil pipe; the detection rod is located inside the detection pipe body and is coaxially arranged with the detection pipe body, the floater is arranged on the detection rod in a sliding mode, a magnetic ring is arranged inside the floater, and the signal processing module is connected with the detection rod.
Preferably, the detection rod is a waveguide tube with a waveguide wire arranged inside.
Preferably, an insulating sleeve for protecting the waveguide wire is arranged inside the detection rod.
Preferably, the signal processing module comprises a signal generating component, an echo detecting component and a controller which are connected with each other.
Preferably, the controller is a PLC controller.
Preferably, the detection pipe body is provided with a branch pipe communicated with the hydraulic oil tank.
Preferably, the branch pipe is horizontally arranged, and a third control valve is arranged on the branch pipe.
Preferably, the device for measuring the internal leakage amount of the hydraulic element further comprises a movable mounting seat; the test oil pipe, the hydraulic oil tank and the magnetostrictive liquid level sensor are all arranged on the movable mounting seat.
Preferably, the bottom of the movable mounting seat is provided with a universal wheel.
The technical scheme of the utility model has the following beneficial effects:
(1) in the utility model, the magnetostrictive liquid level sensor is arranged in the hydraulic element internal leakage amount measuring device, so that the liquid level change caused by the internal leakage of the hydraulic element can be accurately detected, and the measuring precision of the internal leakage of the hydraulic element is improved.
(2) In the utility model, the signal processing module comprises a signal generating assembly, an echo detecting assembly and a controller which are connected with each other, an excitation pulse is sent by the signal generating assembly, the echo pulse is detected by the echo detecting assembly, and the internal leakage amount is calculated by the controller.
(3) In the utility model, the controller is a PLC controller and has an automatic timing function.
(4) According to the utility model, the internal leakage measuring device for the hydraulic element further comprises the movable mounting seat, and the universal wheels are arranged at the bottom of the movable mounting seat, so that the whole measuring device can move freely, and the internal leakage measuring device can be used for measuring the internal leakage of the hydraulic element on different test beds.
(5) Use measuring device in this application to carry out internal leakage volume and measure, compare with the graduated flask method, measurement accuracy obtains promoting by a wide margin, compares with machine vision detection technique, has simplified the operating procedure, has reduced measuring device's cost of manufacture.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic structural diagram of a leakage amount measuring device in a hydraulic component according to an embodiment of the present application;
the device comprises an oil inlet pipe 1, an oil inlet pipe 2, a test oil pipe 3, a hydraulic oil tank 4, a first control valve 5, a second control valve 6, a magnetostrictive liquid level sensor 6.1, a detection pipe body 6.2, a detection rod 6.3, a floater 6.4, a signal processing module 7, a branch pipe 8, a third control valve 9, a movable mounting seat 9.1, a universal wheel 9.2, a mounting rack 10 and a hydraulic element to be tested.
Detailed Description
Embodiments of the utility model will be described in detail below with reference to the drawings, but the utility model can be implemented in many different ways, which are defined and covered by the claims.
Example (b):
referring to fig. 1, the present embodiment is applied to internal leakage measurement of a hydraulic cylinder.
A hydraulic component internal leakage quantity measuring device comprises an oil inlet pipe 1 and a test oil pipe 2 which are respectively connected with an oil inlet and an oil outlet of a hydraulic component 10 to be tested; one end of the test oil pipe 2, which is far away from the hydraulic element 10 to be tested, is connected with the hydraulic oil tank 3; the test oil pipe 2 is provided with a first control valve 4 and a second control valve 5 which are used for controlling the on-off of an oil path between the test oil pipe 2 and the hydraulic oil tank 3, wherein the second control valve 5 is closer to the hydraulic oil tank 3; and a magnetostrictive liquid level sensor 6 is arranged between the first control valve 4 and the second control valve 5 and is used for detecting the internal leakage amount of the hydraulic element 10 to be detected. In this embodiment, the hydraulic component 10 to be measured is a hydraulic cylinder, and when measuring the internal leakage amount of the hydraulic component 10 to be measured, air in the hydraulic component 10 to be measured is firstly exhausted, and a piston of the hydraulic cylinder is pushed to one end of the hydraulic component 10 to be measured; then inputting oil liquid to the test oil pipe 2 and one end of an oil outlet of the hydraulic element to be tested 10 through the hydraulic oil tank 3, filling a cavity at one end of the oil outlet of the hydraulic cylinder, and then closing the second control valve 5; then, oil is input into a cavity at one end of an oil inlet of the hydraulic element 10 to be measured through an oil inlet pipe 1 connected with an oil pump, so that the pressure of hydraulic oil in the hydraulic element 10 to be measured (namely a hydraulic cylinder) reaches the rated pressure or the pressure specified by a user, and the requirement of a method for measuring internal leakage specified in GB/T15622-2005 'Hydraulic Cylinder test method' is met; when the hydraulic component 10 to be tested has internal leakage, the oil flows through the test oil pipe 2 and the first control valve 4 to flow into the magnetostrictive liquid level sensor 6, and the internal leakage amount of the hydraulic component 10 to be tested is detected by the magnetostrictive liquid level sensor 6.
The magnetostrictive liquid level sensor 6 comprises a detection pipe body 6.1, a detection rod 6.2, a floater 6.3 and a signal processing module 6.4; the detection pipe body 6.1 is vertically arranged and communicated with the test oil pipe 2, and leaked oil flows into the detection pipe body 6.1 from the test oil pipe 2 to cause the liquid level of the oil inside the detection pipe body 6.1 to change; the detection rod 6.2 is located inside the detection pipe body 6.1 and the detection rod 6.2 is coaxially arranged with the detection pipe body 6.1, the floater 6.3 is arranged on the detection rod 6.2 in a sliding mode, a magnetic ring is arranged inside the floater 6.3, the floater 6.3 floats on the oil liquid level inside the detection pipe body 6.1 and changes in height position along with the change of the oil liquid level, and the signal processing module 6.4 is connected with the detection rod 6.2 and used for sending and receiving electromagnetic signals to the detection rod 6.2.
The detection 6.2 is a waveguide tube with a waveguide wire arranged inside, is matched with a floater 6.3 with a magnetic ring, and realizes the detection of the liquid level change inside the detection tube body 6.1 by a magnetostrictive technology.
The detection rod 6.2 is internally provided with an insulating sleeve for protecting the waveguide wire, in the embodiment, two layers of insulating sleeves are arranged, the detection rod 6.2 further comprises a return lead, a damping element at the tail end and the like, and the connection mode is designed according to the prior art.
The signal processing module 6.4 comprises a signal generating assembly, an echo detecting assembly and a controller which are connected with each other, the signal generating assembly is used for sending an excitation pulse, the echo detecting assembly is used for detecting an echo pulse, and the controller is used for calculating the internal leakage amount; in the application, the time interval between the emission time of the excitation pulse and the echo pulse is measured by the magnetostrictive technology, and then the time interval is converted into the displacement (namely, the liquid level variation) L of the measured body, and if the difference between the cross section inside the detection pipe body 6.1 and the cross section of the detection rod 6.2 is S, the internal leakage Q of the hydraulic component 10 to be measured is LS/T.
The detection pipe body 6.1 is provided with a branch pipe 7 communicated with the hydraulic oil tank 3, the branch pipe 7 is horizontally arranged, and the branch pipe 7 is provided with a third control valve 8. When the internal leakage amount of the hydraulic element 10 to be detected is measured, the third control valve 8 is opened, when the internal leakage amount of the hydraulic element 10 to be detected is too large, the liquid level of oil inside the detection pipe body 6.1 is too high, and the oil can flow into the hydraulic oil tank 3 from the branch pipe 7 at the moment, so that the magnetostrictive liquid level sensor 6 is protected.
The device for measuring the internal leakage quantity of the hydraulic element further comprises a movable mounting seat 9; the test oil pipe 2, the hydraulic oil tank 3 and the magnetostrictive liquid level sensor 6 are arranged on the movable mounting seat 9, so that the whole movement of the measuring device is convenient to realize, and the internal leakage detection of the hydraulic element 10 to be detected can be carried out on different test beds. In this embodiment, the movable mounting base 9 is provided with a mounting frame 9.2 for fixedly mounting the test oil pipe 2, the hydraulic oil tank 3 and the magnetostrictive liquid level sensor 6, and the bottom of the movable mounting base 9 is provided with a universal wheel 9.1 for realizing free movement of the movable mounting base 9.
The use method of the internal leakage measuring device of the hydraulic element comprises the following steps:
firstly, exhausting air in the hydraulic component 10 to be tested;
opening a first control valve 4, a second control valve 5 and a third control valve 8 to input oil in a hydraulic oil tank 3 to one end of an oil outlet of a hydraulic element 10 to be tested, and then closing the second control valve 5;
inputting oil to one end of an oil inlet of the hydraulic element 10 to be measured through the oil inlet pipe 1, enabling the pressure of hydraulic oil inside the hydraulic element 10 to be measured (namely a hydraulic cylinder) to reach rated pressure or pressure specified by a user, meeting the requirement of a method for measuring internal leakage specified in GB/T15622-2005 'hydraulic cylinder test method', enabling the oil inside a detection pipe body 6.1 of the magnetostrictive liquid level sensor 6 to reach a basic liquid level, and closing the oil inlet pipe 1;
and fourthly, detecting the internal leakage of the hydraulic component 10 to be detected, and obtaining the internal leakage amount of the hydraulic component 10 to be detected through a signal processing module 6.4 of the magnetostrictive liquid level sensor 6.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The internal leakage measuring device for the hydraulic element is characterized by comprising an oil inlet pipe (1) and a test oil pipe (2), wherein the oil inlet pipe and the test oil pipe are respectively connected with an oil inlet and an oil outlet of the hydraulic element to be tested; one end of the test oil pipe (2), which is far away from the hydraulic element to be tested, is connected with the hydraulic oil tank (3); be equipped with first control valve (4) and second control valve (5) on test oil pipe (2), be equipped with magnetostrictive liquid level sensor (6) between first control valve (4) and second control valve (5) for detect the internal leakage volume of hydraulic component that awaits measuring.
2. The device for measuring the internal leakage quantity of the hydraulic element according to claim 1, wherein the magnetostrictive liquid level sensor (6) comprises a detection pipe body (6.1), a detection rod (6.2), a floater (6.3) and a signal processing module (6.4); the detection pipe body (6.1) is vertically arranged and communicated with the test oil pipe (2); the detection rod (6.2) is located inside the detection pipe body (6.1), the detection rod (6.2) and the detection pipe body (6.1) are coaxially arranged, the floater (6.3) is arranged on the detection rod (6.2) in a sliding mode, a magnetic ring is arranged inside the floater (6.3), and the signal processing module (6.4) is connected with the detection rod (6.2).
3. A hydraulic component internal leakage measuring device according to claim 2, wherein the probe rod (6.2) is a waveguide tube with a waveguide wire inside.
4. A hydraulic component internal leakage measuring device according to claim 3, characterised in that the probe rod (6.2) is internally provided with an insulating sleeve for protecting the waveguide wire.
5. A device for measuring the amount of leakage in a hydraulic component according to claim 2, characterised in that the signal processing module (6.4) comprises a signal generating assembly, an echo detection assembly and a controller connected to each other.
6. The apparatus of claim 5, wherein the controller is a PLC controller.
7. A hydraulic component internal leakage measuring device according to claim 2, characterised in that the probe body (6.1) is provided with a branch pipe (7) communicating with the hydraulic reservoir (3).
8. A hydraulic component internal leakage measuring device according to claim 7, wherein the branch pipe (7) is horizontally arranged, and the branch pipe (7) is provided with a third control valve (8).
9. A device for measuring the amount of leakage in a hydraulic component according to claim 1, further comprising a movable mounting (9); the test oil pipe (2), the hydraulic oil tank (3) and the magnetostrictive liquid level sensor (6) are arranged on the movable mounting seat (9).
10. A device for measuring the amount of leakage in a hydraulic component according to claim 9, characterised in that the movable mounting (9) is provided with a universal wheel (9.1) at its bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121807816.7U CN215639980U (en) | 2021-08-04 | 2021-08-04 | Internal leakage quantity measuring device for hydraulic element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121807816.7U CN215639980U (en) | 2021-08-04 | 2021-08-04 | Internal leakage quantity measuring device for hydraulic element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215639980U true CN215639980U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121807816.7U Active CN215639980U (en) | 2021-08-04 | 2021-08-04 | Internal leakage quantity measuring device for hydraulic element |
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| Country | Link |
|---|---|
| CN (1) | CN215639980U (en) |
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2021
- 2021-08-04 CN CN202121807816.7U patent/CN215639980U/en active Active
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