CN113933048A - Automatic detection method of differential pressure valve - Google Patents
Automatic detection method of differential pressure valve Download PDFInfo
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- CN113933048A CN113933048A CN202111246716.6A CN202111246716A CN113933048A CN 113933048 A CN113933048 A CN 113933048A CN 202111246716 A CN202111246716 A CN 202111246716A CN 113933048 A CN113933048 A CN 113933048A
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- 238000001514 detection method Methods 0.000 title description 5
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 238000007689 inspection Methods 0.000 claims abstract description 5
- 239000000725 suspension Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/08—Railway vehicles
- G01M17/10—Suspensions, axles or wheels
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- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses an automatic inspection method of a differential pressure valve, which is characterized in that a controller is used for respectively electrifying normally-open exhaust solenoid valves at the left side and the right side of the differential pressure valve so as to exhaust the solenoid valves, wherein a check valve at one side is opened; and the pressure of the valve ports on the two sides is reduced until the opened one-way valve is closed again, the numerical value of the pressure sensor is observed at the moment, if the pressure value fluctuates within an error range within a plurality of seconds, the pressure of the pressure sensor at the moment is recorded as the opening pressure value of the one-way valve, and the set value test is finished. The invention provides an automatic inspection method which is simple to operate, convenient to maintain, convenient to move and low in cost, and can greatly improve the working efficiency.
Description
Technical Field
The invention relates to the field of air suspension systems, in particular to an automatic testing method of a differential pressure valve.
Background
In the air suspension system of the rail transit, as the medium adopted by the air spring is mainly air, the active control is easier to implement. And the air spring can utilize a height control system to keep the working height of the air spring basically unchanged under different loads, so that the vehicle body can stably run and the air spring can be widely applied to the field of rail transit air. In an air suspension system, the most important core is an automatic air spring adjusting device which comprises a height valve, a differential pressure valve and a connecting rod.
Because rail vehicle is in long-term operation, the vehicle bottom environment is abominable, influences such as silt, sleet, greasy dirt have reduced the differential pressure valve reliability, also can aggravate the theoretical differential pressure value that the differential pressure valve deviated setting, have lost product property ability.
Meanwhile, the problems brought by the differential pressure valve in the using process are not only troubles brought by the running of the vehicle body, but also manual measurement is adopted in the production, debugging and maintenance detection processes of products without convenient and concise detection methods, and the whole detection period is long and the efficiency is not high.
Disclosure of Invention
The invention aims to provide an automatic testing method of a differential pressure valve aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: a method for automatically testing a differential pressure valve comprises the steps that a left valve port and a right valve port of the differential pressure valve are connected to a gas circuit of an input port through gas circuits respectively, normally-open exhaust solenoid valves are installed on the gas circuits of the left valve port and the right valve port of the differential pressure valve, normally-open exhaust solenoid valves and air cylinders are installed on the gas circuits of the input port, and pressure sensors are installed on the gas circuits at the lower ends of the air cylinders; the normally open exhaust solenoid valve and the normally open exhaust solenoid valve are controlled by a controller; the specific steps for checking the pressure set value of the differential pressure valve are as follows:
(1) the controller is not electrified to the normally open exhaust solenoid valve and the normally open exhaust solenoid valve, all the solenoid valves are in a normally open state, air enters the input port, and enters the two valve ports of the differential pressure valve after being usually electrified without the exhaust solenoid valve and the air cylinder;
(2) because the controller is under the condition that two normal open are not provided with the exhaust electromagnetic valve and are not electrified, the left valve port and the right valve port of the differential pressure valve are in a balanced state under the action of air pressure to achieve the pressure maintaining function, then the normal open belt exhaust electromagnetic valve of the right valve port of the differential pressure valve is electrified, the electromagnetic valve exhausts, and the left check valve is opened under the pressure of the left valve port; the pressure of the left valve port is supplemented to the right valve port;
(3) the pressure of the left valve port and the pressure of the right valve port are both reduced until the pressure of the left valve port is reduced to the opening pressure of the left check valve, the left check valve is closed again, the numerical value of the pressure sensor is observed at the moment, if the pressure value fluctuates within an error range within a plurality of seconds, the pressure of the pressure sensor at the moment is recorded as the opening pressure value of the left check valve, and the test of the set value on the left side is finished;
(4) and (4) performing a right set value test in the same manner as the step (2) and the step (3).
Furthermore, a pressure reducing valve is arranged on an air path between the input port and the normally-open exhaust-free electromagnetic valve.
Furthermore, the air cylinder is a 2-liter air cylinder, and the air cylinder is used as an equipment container for pressure load, so that the differential pressure valve is in dynamic motion in the processes of air inlet, pressure maintaining and air exhaust.
The invention has the beneficial effects that: the invention provides an automatic inspection method which is simple to operate, convenient to maintain, convenient to move and low in cost, and can greatly improve the working efficiency. The opening pressure value of the one-way valve is determined by the spring force, the pressure value when the one-way valve is closed is also determined by the spring force, and the opening pressure value and the closing value of the one-way valve are theoretically consistent in stress. Therefore, the check valve closing value is tested, and the automatic check logic is easier to realize and has strong operability.
Drawings
FIG. 1 is a schematic diagram of the method of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in figure 1, the automatic inspection method of the differential pressure valve provided by the invention is characterized in that a left valve port and a right valve port of the differential pressure valve are respectively connected to an air path of an input port 8 through air paths, the air paths of the left valve port and the right valve port of the differential pressure valve 6 are respectively provided with a right normally-open exhaust solenoid valve 4 and a left normally-open exhaust solenoid valve 5, the air path of the input port 8 is provided with a normally-open exhaust solenoid valve 2 and an air cylinder 7, the air path between the input port 8 and the normally-open exhaust solenoid valve 2 is provided with a pressure reducing valve 1, the air path at the lower end of the air cylinder is provided with a pressure sensor 3, and the air cylinder is used as a pressure-loaded equipment container, so that the differential pressure valve is in dynamic motion in the air inlet, pressure maintaining and exhaust processes. The right normally-open exhaust solenoid valve 4, the left normally-open exhaust solenoid valve 5 and the normally-open non-exhaust solenoid valve 2 are controlled by a controller 9; the specific steps for checking the pressure set value of the operation of the differential pressure valve 6 are as follows:
and (3) testing a left set value: controller 9 does not take exhaust solenoid valve 2 to the normal open, the normal open exhaust solenoid valve 4 in right side, the normal open exhaust solenoid valve 5 in left side does not all not have the circular telegram, all solenoid valves are in the normal open state, admit air to input port 8, set for 1 output pressure of relief pressure valve and be 900kPa back, the normal open does not take exhaust solenoid valve 2, 2L reservoir 7, divide into two branches, get into the valve port on the right side of differential pressure valve 6 through the normal open exhaust solenoid valve 4 in right side all the way, another way gets into the valve port on the left side of differential pressure valve 6 through the normal open exhaust solenoid valve 5 in left side. A pressure sensor 3 is placed at the lower end of a 2L air cylinder 7, when the pressure is stabilized at 900kPa, a controller 9 is used for powering off a normally open exhaust solenoid valve 2, the downstream is in a pressure maintaining state, then the right normally open exhaust solenoid valve 4 is powered on, the right normally open exhaust solenoid valve 4 exhausts air, a left check valve is opened under the high pressure of a left valve port, the air pressure of the left valve port is supplemented to the right valve port, but because the whole system has no additional gas supplement, and the air pressure of the right valve port is exhausted along with the right normally open exhaust solenoid valve 4, the air pressure of the two valve ports is reduced, until the air pressure of the left valve port is reduced to the opening pressure of the left check valve, the left check valve is closed again, the pressure of the pressure sensor 3 is observed, if the pressure value does not change obviously (fluctuates within an error range) within the stabilization time of 30S, the pressure of the pressure sensor 3 is recorded as the opening pressure value of the left check valve, the left set value test is finished;
and (3) testing a right set value: with left side setting value test the same way, controller 9 does not take exhaust solenoid valve 2 to the normal open, right side normal open band exhaust solenoid valve 4 and left side normal open band exhaust solenoid valve 5 all do not have the circular telegram, all solenoid valves are in normal open state, admit air to input port 8, set for 1 output pressure of relief pressure valve and be 900kPa back, the normal open does not take exhaust solenoid valve 2, 2L reservoir 7, divide into two branches, get into the valve port on the right side of differential pressure valve 6 through right side normal open band exhaust solenoid valve 4 all the way, another way gets into the valve port on the left side of differential pressure valve 6 through left side normal open band exhaust solenoid valve 5. A pressure sensor 3 is placed at the lower end of a 2L air cylinder 7, when the pressure is stabilized at 900kPa, a controller 9 is used for powering off a normally open exhaust solenoid valve 2, the downstream is in a pressure maintaining state, then the left normally open exhaust solenoid valve 5 is powered on, the left normally open exhaust solenoid valve 5 exhausts air, the right check valve is opened under the high pressure of the right valve port, the air pressure of the right valve port is supplemented to the left valve port, but because the whole system has no additional gas supplement, and the air pressure of the left valve port is exhausted along with the left normally open exhaust solenoid valve 5, the air pressure of the two valve ports is reduced, until the air pressure of the right valve port is reduced to the opening pressure of the right check valve, the right check valve is closed again, the pressure of the pressure sensor 3 is observed, if the pressure value does not change obviously within the stabilization time of 30S, the pressure of the pressure sensor 3 at the moment is recorded as the opening pressure value of the right check valve, the right set value test is finished;
the opening pressure value of the one-way valve is determined by the spring force, the pressure value when the one-way valve is closed is also determined by the spring force, and the opening pressure value and the closing value of the one-way valve are theoretically consistent in stress. Therefore, the check valve closing value is tested, and the automatic check logic is easier to realize and has strong operability.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (3)
1. The automatic inspection method of the differential pressure valve is characterized in that the left valve port and the right valve port of the differential pressure valve are respectively connected to a gas circuit of an input port through gas circuits, normally open exhaust solenoid valves are installed on the gas circuits of the left valve port and the right valve port of the differential pressure valve, normally open exhaust solenoid valves and air cylinders are installed on the gas circuits of the input port, and pressure sensors are installed on the gas circuits at the lower ends of the air cylinders; the normally open exhaust solenoid valve and the normally open exhaust solenoid valve are controlled by a controller; the specific steps for checking the pressure set value of the differential pressure valve are as follows:
(1) the controller is used for not electrifying the two normally-open exhaust electromagnetic valves without the exhaust electromagnetic valve and the normally-open exhaust electromagnetic valve with the exhaust electromagnetic valve, all the electromagnetic valves are in a normally-open state, air enters the input port, and enters the two valve ports of the differential pressure valve after being always electrified without the exhaust electromagnetic valve and the air cylinder;
(2) because the controller is under the condition that two normal open are not provided with the exhaust electromagnetic valve and are not electrified, the left valve port and the right valve port of the differential pressure valve are in a balanced state under the action of air pressure to achieve the pressure maintaining function, then the normal open belt exhaust electromagnetic valve of the right valve port of the differential pressure valve is electrified, the electromagnetic valve exhausts, and the left check valve is opened under the pressure of the left valve port; the pressure of the left valve port is supplemented to the right valve port;
(3) the pressure of the left valve port and the pressure of the right valve port are both reduced until the pressure of the left valve port is reduced to the opening pressure of the left check valve, the left check valve is closed again, the numerical value of the pressure sensor is observed at the moment, if the pressure value fluctuates within an error range within a plurality of seconds, the pressure of the pressure sensor at the moment is recorded as the opening pressure value of the left check valve, and the test of the set value on the left side is finished;
(4) and (4) performing a right set value test in the same manner as the step (2) and the step (3).
2. The method of claim 1, wherein a pressure relief valve is installed in the path between the input port and the normally open exhaust solenoid valve.
3. The method of claim 1, wherein the reservoir is a 2-liter reservoir, and the reservoir is a pressure-loaded equipment container, so that the differential valve is in dynamic motion during the processes of air intake, pressure maintaining and air exhaust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111246716.6A CN113933048B (en) | 2021-10-26 | Automatic checking method for differential pressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111246716.6A CN113933048B (en) | 2021-10-26 | Automatic checking method for differential pressure valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113933048A true CN113933048A (en) | 2022-01-14 |
| CN113933048B CN113933048B (en) | 2024-05-10 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03167070A (en) * | 1989-11-27 | 1991-07-18 | Sumitomo Metal Ind Ltd | Electronic control method of air spring for rolling stock |
| CN201819777U (en) * | 2010-09-10 | 2011-05-04 | 长春轨道客车股份有限公司 | Detection device of differential pressure valve |
| CN103674541A (en) * | 2013-12-31 | 2014-03-26 | 卓旦春 | Method for testing performance of differential pressure valve |
| CN103983447A (en) * | 2014-05-27 | 2014-08-13 | 牡丹江市康兴电站设备制造有限公司 | Performance test bench for differential valve of power station oil seal system |
| CN105910813A (en) * | 2016-06-23 | 2016-08-31 | 太原鹏跃电子科技有限公司 | Double-valve test bench |
| CN206095653U (en) * | 2016-09-22 | 2017-04-12 | 杭州中车车辆有限公司 | Railcar braking system brake valve class test bench |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03167070A (en) * | 1989-11-27 | 1991-07-18 | Sumitomo Metal Ind Ltd | Electronic control method of air spring for rolling stock |
| CN201819777U (en) * | 2010-09-10 | 2011-05-04 | 长春轨道客车股份有限公司 | Detection device of differential pressure valve |
| CN103674541A (en) * | 2013-12-31 | 2014-03-26 | 卓旦春 | Method for testing performance of differential pressure valve |
| CN103983447A (en) * | 2014-05-27 | 2014-08-13 | 牡丹江市康兴电站设备制造有限公司 | Performance test bench for differential valve of power station oil seal system |
| CN105910813A (en) * | 2016-06-23 | 2016-08-31 | 太原鹏跃电子科技有限公司 | Double-valve test bench |
| CN206095653U (en) * | 2016-09-22 | 2017-04-12 | 杭州中车车辆有限公司 | Railcar braking system brake valve class test bench |
Non-Patent Citations (1)
| Title |
|---|
| 吴帅: "差压式空气泄漏检测仪的研究与设计", 15 May 2014 (2014-05-15) * |
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