CN113864265A - Hydraulic valve testing tool and micro-motion characteristic testing method for bridge type hydraulic circuit - Google Patents
Hydraulic valve testing tool and micro-motion characteristic testing method for bridge type hydraulic circuit Download PDFInfo
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- CN113864265A CN113864265A CN202111052669.1A CN202111052669A CN113864265A CN 113864265 A CN113864265 A CN 113864265A CN 202111052669 A CN202111052669 A CN 202111052669A CN 113864265 A CN113864265 A CN 113864265A
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- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 238000010998 test method Methods 0.000 claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Engineering & Computer Science (AREA)
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention mainly relates to the technical field of micromotion characteristic tests, and a test tool comprises: a first oil through hole; a second oil through opening; a first oil passage; a second oil passage; a third oil passage; a fourth oil passage; a fifth oil passage; an overflow valve; a flow meter; a first check valve; a second one-way valve; the test method comprises the steps that the load of the overflow valve is set to be 75% of the nominal pressure; the oil inlet of the tested valve passes through the nominal flow; reversing a valve rod of the tested valve from a middle position to enter a first working state; the valve rod of the tested valve is reversed from the first working state to enter the second working state, and by the test method and the test tool, under the condition that the flow directions of the push-pull valve rod, namely the flow directions of the oil inlet P and the oil return port T are opposite, the flow can be positively timed through the flow, so that the secondary disassembly step is omitted, the measurement time is saved, and the measurement efficiency is improved.
Description
Technical Field
The invention mainly relates to the technical field of micro-motion characteristic testing, in particular to a hydraulic valve testing tool of a bridge type hydraulic circuit and a micro-motion characteristic testing method.
Background
The micro-motion characteristic is one of main indexes for evaluating the quality of the reversing valve, the micro-motion characteristic refers to the capability of the flow and the pressure at a small opening changing along with the change of the size of the opening of the valve, if the change is slow, the resolution ratio is high, the micro-motion characteristic of the valve is good, the maneuverability is good, and the phenomena of inaccurate positioning or sudden increase and movement of the flow can not occur when an execution mechanism is controlled.
Among the prior art, the fine motion characteristic test need link to each other by the hydraulic fluid port that awaits measuring and the flowmeter of test valve, and the numerical value is read in the test, need dismantle the flowmeter during reverse oil flow, and the reverse flow meter that connects, the retest reads numerical value, and it is very troublesome when measuring like this, need carry out the secondary to the flowmeter and dismantle, both extravagant measuring time has reduced measurement of efficiency again.
Disclosure of Invention
The invention mainly provides a hydraulic valve testing tool of a bridge type hydraulic circuit and a micro-motion characteristic testing method, which are used for solving the technical problems in the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a hydrovalve test fixture of bridge type hydraulic circuit, its characterized in that, test fixture includes the bridge type return circuit, the bridge type return circuit includes: a first oil through hole; a second oil through opening; one end of the first oil way is communicated with the first oil through hole; one end of the second oil way is connected with the first oil way in series, the connection position is marked as a first node, and the other end of the second oil way is communicated with the second oil through hole; one end of the third oil way is communicated with the first oil through hole; one end of the fourth oil way is connected with the third oil way in series, the connection position is marked as a second node, and the other end of the fourth oil way is communicated with the second oil through hole; the fifth oil way is communicated between the first node and the second node; the test fixture further comprises: the oil inlet of the overflow valve is communicated with the first node, and the oil outlet of the overflow valve is communicated with the second node; the flowmeter is connected between the overflow valve and the second node; the first check valve is arranged on the first oil path and conducts the first oil through port to the first node in a one-way mode; the second check valve is arranged on the second oil path and conducts the second oil through port to the first node in a one-way mode; the third check valve is arranged on the third oil path and conducts the second node to the first oil through hole in a one-way mode; and the fourth check valve is arranged on the fourth oil path and conducts the second node to the second oil through hole in a one-way mode.
A fretting behavior test method using the hydraulic valve test tool of the bridge hydraulic circuit of claim 1, the test method comprising: step S1, setting the load of the overflow valve to be 75% of the nominal pressure; step S2, nominal flow is conducted on an oil inlet of the tested valve; step S3, reversing the valve rod of the tested valve from a middle position state to a first working state at a first preset speed; step S4, reading the flow count value; step S5, returning the valve rod of the tested valve from the first working state to the middle position state at a second preset speed; step S6, reversing the valve rod of the tested valve from the middle position state to a second working state at the first preset speed; step S7, reading the flow count value; and step S8, returning the valve rod of the tested valve from the second working state to the middle position state at a second preset speed.
Preferably, the first predetermined speed is 7 mm of displacement in 5 seconds; the second predetermined speed is 7 mm displacement in 1 second.
Compared with the prior art, the invention has the beneficial effects that: by the test method and the test tool, under the condition that the flow directions of the push-pull valve rod, namely the flow directions of the oil inlet P and the oil return port T are opposite, the flow can be positively measured through the flow meter.
The present invention will be explained in detail below with reference to the drawings and specific embodiments.
Drawings
FIG. 1 is a schematic diagram of a test tool oil circuit according to the present invention;
FIG. 2 is a schematic view illustrating a flow direction of an oil path in a first operating state of the present invention;
FIG. 3 is a schematic view illustrating the flow direction of the oil path in the second operating state of the present invention;
FIG. 4 is a flow chart of a testing method of the present invention.
In the figure: 1 a first oil path;
2 a second oil passage;
3 a third oil path;
4 a fourth oil path;
5 a fifth oil passage;
6, an overflow valve;
7, a flow meter;
8 a first one-way valve;
9 a second one-way valve;
10 a third one-way valve;
11 a fourth check valve;
a, a first working oil port;
b, a second working oil port;
c, a first oil through hole;
d, a second oil through hole;
e, a first node;
f, a second node;
a P oil inlet;
and T, an oil return port.
Detailed Description
In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in different forms and not limited to the embodiments described herein, but which are provided so as to provide a more thorough and complete disclosure of the invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the knowledge of the terms used herein in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Please refer to fig. 1 in greater detail, fig. 1 is a schematic diagram of an oil path of a testing tool of the present invention, the testing tool includes a bridge-type circuit, the bridge-type circuit includes a first oil passage C, a second oil passage D, a first oil passage 1, a second oil passage 2, a third oil passage 3, a fourth oil passage 4 and a fifth oil passage 5, the testing tool further includes an overflow valve 6, a flowmeter 7, a first check valve 8, a second check valve 9, a third check valve 10 and a fourth check valve 11, wherein one end of the first oil passage 1 is communicated with the first oil passage C; one end of the second oil way 2 is connected with the first oil way 1 in series, the connection position is marked as a first node E, and the other end is communicated with the second oil through hole D; one end of the third oil path 3 is communicated with a first oil through hole C; one end of the fourth oil way 4 is connected with the third oil way 3 in series, the connection position is marked as a second node F, and the other end of the fourth oil way is communicated with a second oil through hole D; the fifth oil way 5 is communicated between the first node E and the second node F; an oil inlet of the overflow valve 6 is communicated with the first node E, and an oil outlet of the overflow valve 6 is communicated with the second node F; the flowmeter 7 is connected between the overflow valve 6 and the second node F; the first check valve 8 is arranged on the first oil way 1, and the first check valve 8 unidirectionally conducts the first oil through port C to the first node E; the second check valve 9 is arranged on the second oil way 2, and the second check valve 9 unidirectionally conducts the second oil through port D to the first node E; the third check valve 10 is arranged on the third oil path 3, and the third check valve 10 unidirectionally conducts the second node F to the first oil through port C; the fourth check valve 11 is arranged on the fourth oil path 4, and the fourth check valve 11 unidirectionally conducts the second node F to the second oil through port D.
A micro-motion characteristic testing method is shown in figure 4 and is used for measuring a tested valve and adopts the hydraulic valve testing tool of the bridge type hydraulic circuit, and the testing method comprises the following steps:
step S1, setting the load of the overflow valve 6 to be 75% of the nominal pressure;
step S2, passing a nominal flow to an oil inlet P of the tested valve;
step S3, reversing a valve rod of the tested valve from a middle position at a first preset speed to enter a first working state, wherein in the first working state, as shown in figure 2, the flow flows in from an oil inlet P of the tested valve, flows out from a first working oil port A of the tested valve, enters a test tool, sequentially passes through a first oil passing port C, a first check valve 8, a first node E, an overflow valve 6, a flow meter 7, a second node F, a fourth check valve 11 and a second oil passing port D, finally returns to the tested valve from a second working oil port B, and then flows out of the tested valve from an oil return port T;
step S4, reading a flow count value;
step S5, returning the valve rod of the tested valve to the middle position state from the first working state at a second preset speed, namely immediately returning to the middle position state;
step S6, reversing the valve stem of the tested valve from the neutral position state to enter a second working state at a first predetermined speed, as shown in fig. 3, where the flow enters from the tested valve oil return port T, the flow exits from the tested valve second working port B, enters the testing tool, passes through the second oil through port D, the second check valve 9, the first node E, the overflow valve 6, the flow meter 7, the second node F, the third check valve 10 and the first oil through port C in sequence, finally returns to the tested valve from the first working port a, and then flows out of the tested valve from the oil inlet P;
step S7, reading a flow count value;
and step S8, returning the valve rod of the tested valve to the middle position state from the second working state at a second preset speed, namely immediately returning to the middle position state.
By the test method, the flow micro-motion characteristic from the oil inlet P of the tested valve to the first working oil port A/the second working oil port B can be measured, and similarly, the flow micro-motion characteristic from the first working oil port A/the second working oil port B to the oil return port T of the tested valve can also be measured, wherein, aiming at the steps S3 and S5, in the case of the push-pull valve rod, namely, under the condition that the flow directions of the oil inlet P and the oil return port T are opposite, the flow can pass through the flow meter in the forward direction, compared with the prior art, the secondary disassembly step is omitted, the measurement time is saved, meanwhile, the measurement efficiency is also improved, and therefore, the hydraulic valve test tool and the micromotion characteristic test method for the bridge hydraulic circuit provided by the embodiment are believed to solve the technical problems that in the prior art, the flow meter needs to be disassembled secondarily during measurement, the measurement time is wasted, and the measurement efficiency is reduced.
In view of the specific implementation of the first predetermined speed and the second predetermined speed, on the basis of the above embodiment, the present invention further provides a preferable technical solution, where the first predetermined speed is 7 mm displaced in 5 seconds, that is, the valve rod is slowly pushed/pulled, so as to achieve the purpose of measuring the micro-motion characteristic of the measured valve; the second predetermined speed is 7 mm displacement in 1 second, which quickly returns the valve stem to the neutral position.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to adopt such insubstantial modifications of the inventive concept and solution, or to apply the inventive concept and solution directly to other applications without such modifications.
Claims (3)
1. The utility model provides a hydrovalve test fixture of bridge type hydraulic circuit, its characterized in that, test fixture includes the bridge type return circuit, the bridge type return circuit includes:
a first oil through hole;
a second oil through opening;
one end of the first oil way is communicated with the first oil through hole;
one end of the second oil way is connected with the first oil way in series, the connection position is marked as a first node, and the other end of the second oil way is communicated with the second oil through hole;
one end of the third oil way is communicated with the first oil through hole;
one end of the fourth oil way is connected with the third oil way in series, the connection position is marked as a second node, and the other end of the fourth oil way is communicated with the second oil through hole; and
the fifth oil way is communicated between the first node and the second node;
the test fixture further comprises:
the oil inlet of the overflow valve is communicated with the first node, and the oil outlet of the overflow valve is communicated with the second node;
the flowmeter is connected between the overflow valve and the second node;
the first check valve is arranged on the first oil path and conducts the first oil through port to the first node in a one-way mode;
the second check valve is arranged on the second oil path and conducts the second oil through port to the first node in a one-way mode;
the third check valve is arranged on the third oil path and conducts the second node to the first oil through hole in a one-way mode; and
and the fourth check valve is arranged on the fourth oil path and conducts the second node to the second oil through port in a one-way mode.
2. A fretting behavior test method, wherein the hydraulic valve test tool of the bridge hydraulic circuit according to claim 1 is adopted, and the test method comprises the following steps:
step S1, setting the load of the overflow valve to be 75% of the nominal pressure;
step S2, nominal flow is conducted on an oil inlet of the tested valve;
step S3, reversing the valve rod of the tested valve from a middle position state to a first working state at a first preset speed;
step S4, reading the flow count value;
step S5, returning the valve rod of the tested valve from the first working state to the middle position state at a second preset speed;
step S6, reversing the valve rod of the tested valve from the middle position state to a second working state at the first preset speed;
step S7, reading the flow count value;
and step S8, returning the valve rod of the tested valve from the second working state to the middle position state at a second preset speed.
3. The method of claim 2, wherein the first predetermined speed is 7 mm displacement in 5 seconds;
the second predetermined speed is 7 mm displacement in 1 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111052669.1A CN113864265A (en) | 2021-09-09 | 2021-09-09 | Hydraulic valve testing tool and micro-motion characteristic testing method for bridge type hydraulic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111052669.1A CN113864265A (en) | 2021-09-09 | 2021-09-09 | Hydraulic valve testing tool and micro-motion characteristic testing method for bridge type hydraulic circuit |
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|---|---|
| CN113864265A true CN113864265A (en) | 2021-12-31 |
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| CN202111052669.1A Pending CN113864265A (en) | 2021-09-09 | 2021-09-09 | Hydraulic valve testing tool and micro-motion characteristic testing method for bridge type hydraulic circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2173414C1 (en) * | 2000-06-27 | 2001-09-10 | Всероссийский научно-исследовательский технологический институт ремонта и эксплуатации машинно-тракторного парка | Stand for testing steering hydraulic unit components |
| CN203548388U (en) * | 2013-11-21 | 2014-04-16 | 中联重科股份有限公司 | Hydraulic loading circuit for multi-way valve |
| CN104454792A (en) * | 2014-12-19 | 2015-03-25 | 上海电气液压气动有限公司 | Comprehensive testing system of hydraulic product pump |
| CN109506905A (en) * | 2018-10-31 | 2019-03-22 | 西南交通大学 | A kind of electro-hydraulic testing stand |
| CN111735619A (en) * | 2020-06-18 | 2020-10-02 | 北京天地玛珂电液控制系统有限公司 | Automatic control electromagnetic directional valve test system and method |
-
2021
- 2021-09-09 CN CN202111052669.1A patent/CN113864265A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2173414C1 (en) * | 2000-06-27 | 2001-09-10 | Всероссийский научно-исследовательский технологический институт ремонта и эксплуатации машинно-тракторного парка | Stand for testing steering hydraulic unit components |
| CN203548388U (en) * | 2013-11-21 | 2014-04-16 | 中联重科股份有限公司 | Hydraulic loading circuit for multi-way valve |
| CN104454792A (en) * | 2014-12-19 | 2015-03-25 | 上海电气液压气动有限公司 | Comprehensive testing system of hydraulic product pump |
| CN109506905A (en) * | 2018-10-31 | 2019-03-22 | 西南交通大学 | A kind of electro-hydraulic testing stand |
| CN111735619A (en) * | 2020-06-18 | 2020-10-02 | 北京天地玛珂电液控制系统有限公司 | Automatic control electromagnetic directional valve test system and method |
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