CN115791149B - Intelligent testing system for multi-way reversing valve - Google Patents

Abstract

The present invention relates to the technical field of hydraulic valves, in particular to an intelligent test system for multi-way reversing valves, comprising: a closing module, which is used to close each opening in a first preset closing manner or a second preset closing manner; The pressure module is used to respectively pressurize the openings of the multi-way reversing valve to be tested and the oil passages of the multi-way reversing valve in the first preset working condition and the second preset working condition; the pressure detection module is used to The closed module measures the pressure on each opening; the laser detection module is used to irradiate the valve plug and receive the reflected lasers; the central control module is used to analyze the results to determine the damage position of the multi-way reversing valve; use the setting The method of each module mentioned above detects the tightness of the opening, the tightness of the valve body and the smoothness of the valve core of the multi-way reversing valve, which effectively reduces the detection complexity of the multi-way reversing valve and effectively improves the multi-way reversing valve. Accuracy of reversing valve fault location.

Description

An intelligent test system for multi-way reversing valve

technical field

The invention relates to the technical field of hydraulic valves, in particular to an intelligent test system for multi-way reversing valves.

Background technique

As an important part of the hydraulic system, multi-way reversing valves are closely matched with each other, and the structure of each part of the valve is very compact. For the detection of multi-way directional valves, it is difficult to detect multi-way directional valves by the current testing methods. The actual damaged part of the reversing valve is determined.

Chinese Patent Publication No.: CN105136442A discloses a factory test and detection method of a hydraulic multi-way directional valve. Using a pressure test, a pressure test pressure is applied to each pressure oil port. During the test, the test pressure is increased to the pressure test pressure to ensure Oil circuit type and spool valve function, reversing performance, internal leakage, measuring the neutral position. The multi-way valve in the building market is in the neutral position, the AB oil inlet is blocked, the system pressure is adjusted to the nominal pressure, and the leakage flow is measured from the T port. ; Pressure loss, the multi-way valve under test is in the reversing position, the system flow is adjusted to the nominal flow rate, and the pressure loss of P-A, B-T or P-B, A-T is measured; the performance of the safety valve, the AB port of the multi-way valve under test is blocked, and placed in the changer Adjust the system pressure to be higher than the nominal pressure of the safety valve, and pass through the nominal flow rate to measure the pressure regulation range, pressure stability, pressure swing and closing characteristics of the safety valve. Chinese Patent Publication No.: CN109342050A discloses a multi-mode multi-way reversing valve performance testing system and testing method. By setting up two sets of test bridges, it is suitable for performance testing of multi-way reversing valves in various test oil circuit modes. .

It can be seen that the above-mentioned technical solution has the following problem: the problem that the actual damage position of the multi-way reversing valve cannot be determined.

Contents of the invention

For this reason, the present invention provides a multi-way directional valve intelligent testing system to overcome the problem in the prior art that the actual damage position of the multi-way directional valve cannot be determined, resulting in low efficiency in locating the damaged position of the multi-way directional valve question.

In order to achieve the above purpose, the present invention provides a multi-way reversing valve intelligent test system, including:

A closing module, which is arranged at each opening on the surface of the multi-way reversing valve to be tested, so as to close each opening in a first preset closing manner or a second preset closing manner;

A pressurizing module, which is connected with the closed module and the multi-way reversing valve to be tested, for when the multi-way reversing valve to be tested is in the first preset working condition and the second preset working condition, pressurizing the oil circuit inside the multi-way reversing valve to be tested through the opened opening;

a pressure detection module, which is arranged at each of the openings of the closed module, and is used to measure the pressure on each opening;

A laser detection module, which includes several laser generating units of the same specification and a laser receiving unit, which are used to irradiate the valve plug of the multi-way reversing valve to be tested with laser light in a preset direction and receive reflected laser points;

a central control module, which is respectively connected to the sealing module, the pressurization module, the pressure detection module and the laser detection module, to control the closure module and the pressurization module to work in a set order, And, analyze the pressures and the laser points, and determine the damage position of the multi-way reversing valve to be tested according to the analysis results;

Wherein, the first preset closing method is to open one of the openings to be tested of the multi-way directional control valve to be tested and close other openings of the multi-way directional control valve to be tested except the opening to be tested, the first The second preset closing method is to close all openings in the multi-way directional valve to be tested for connecting output objects and open other openings of the multi-way directional valve to be tested. The first preset working condition is The corresponding working condition when the valve plug is at the first preset position, and the second preset working condition is the corresponding working condition when the valve plug is at the second preset position;

Wherein, the first preset position is the corresponding position of the valve plug when the oil in the multi-way reversing valve to be tested is in the preset positive direction, and the second preset position is the corresponding position of the multi-way reversing valve to be tested The corresponding position of the valve plug when the medium oil is in the preset reverse direction, the preset forward direction and the preset reverse direction are related to the working connection mode of the multi-way reversing valve to be tested.

Further, the sealing module includes several sealing covers, and the sealing covers cover each opening on the surface of the valve body of the multi-way reversing valve to be tested in a preset manner;

The pressurization module gradually increases the pressure applied to the multi-way directional valve to be tested at preset time intervals when testing the multi-way directional valve to be tested;

When the sealing cover of the closure module is closed to the corresponding opening, the edge of the sealing cover is rigidly connected to the corresponding opening, and the middle part of the sealing cover can be upward or downward when bearing a preset minimum deformation pressure. under the bulge;

Wherein, the preset minimum deformation pressure is a value corresponding to the minimum pressure of the pressurization module.

Further, the central control module adopts the first control method to control the work of the closed module and the pressurized module, and sets the currently opened opening as the i-th opening, and the pressurized module switches the multi-way to be tested The pressure in the valve is pressurized to the preset pressure Pi, where i=1, 2,..., n, n is the number of openings corresponding to the multi-way reversing valve to be tested, n≥4 and n is an integer, the central control module Judging the total quantity na of the pressure Pi' measured by the pressure detection module from any closed opening during pressurization, so as to classify the strictness interval of the multi-way reversing valve to be tested,

If na≤1, the central control module determines that the multi-way reversing valve to be tested complies with the first preset stringency;

If na≥2, the central control module determines that the multi-way reversing valve to be tested does not meet the first preset strictness, and further judges according to the variance σ _i ² of each Pi';

Wherein, the first control mode is to control the closing module to close the multi-way switching valve in the first preset closing mode, and control the pressurizing module to switch from the opened opening to the multi-way switching valve. pressurize the valve;

The first preset tightness is the corresponding tightness without leakage between the valve plug and the valve body of the multi-way reversing valve to be tested.

Further, the central control module determines the state of the multi-way reversing valve to be tested according to the mean square error σ _i ² of each Pi' detected by the pressure detection module under the first judgment condition, and the central control module is provided with The first preset comparison value α1 and the second preset comparison value α2, wherein, 0<α1<α2, the central control module compares σ _i ² with α1 and α2,

If _α2≤σi ² , the central control module determines that the multi-way reversing valve to be tested is in the second preset stringency;

If _α1≤σi ² <α2, the central control module determines that the multi-way reversing valve to be tested is in the third preset strictness;

If 0≤σ _i ² <α1, the central control module determines that the multi-way reversing valve to be tested is damaged, and determines the damaged part according to the detection result of the laser detection module;

Wherein, the first judgment condition is that the central control module judges that the multi-way reversing valve to be tested does not meet the first preset strictness;

The second preset tightness is the corresponding tightness of the multi-way reversing valve to be tested that can work normally; the third preset tightness is the corresponding tightness of the damaged opening of the multi-way reversing valve to be tested Spend.

Further, in the second judgment condition, the central control module is the difference Δα obtained by making a difference between the mean square error σ _i ² corresponding to the i-th opening and the mean square error σ i+1 ² corresponding to _{the i+1} -th opening Make a judgment to determine the damage position of the opening of the multi-way reversing valve to be tested, set Δα=σ _i ² -σ _i+1 ² , the central control module is provided with a third preset comparison value α3, where 0 <α3, the central control module compares Δα with α3,

If -α3≤Δα≤α3, the central control module determines that the joint position of the valve body and the valve plug is damaged, and determines the damaged part according to the detection result of the laser detection module;

If Δα<-α3, the central control module determines that the ith opening position is damaged;

If α3<Δα, the central control module determines that the i+1th opening position is damaged;

Wherein, the second judging condition is that the central control module judges that the multi-way reversing valve to be tested is in the third preset strictness.

Further, the detection mode of the laser detection module is:

Step S1, removing the valve plug from the multi-way reversing valve to be tested and fixing it at the set detection position of the laser detection module;

In step S2, the laser generating unit takes the central axis of the valve plug as a reference, and at the same time irradiates a beam of parallel laser light to the upper tangential direction and the lower tangential direction of the cross-section of the valve plug in a preset direction. The jth laser beam in the upper tangential direction corresponds to the j'th laser beam directed at the lower tangential direction of the cross-section of the valve plug, and is coplanar on the cross-section;

Step S3, the laser receiving unit receives the light reflected by the laser generating unit through the surface of the valve plug, and calculates the distance Lj between the reflection point corresponding to the jth laser and the reflection point corresponding to the j'th laser ;

Wherein, j=1, 2, 3, . . . , m, m≥2 and m is an integer.

Further, the central control module determines the smoothness of the valve plug according to the measured distance Lj of the valve plug in the third judgment condition, and the central control module is provided with a corresponding to the multi-way directional valve to be tested. The qualified distance Lα and the second preset distance Lβ, where 0<Lα<Lβ, the central control module compares Lj with Lα and Lβ sequentially,

If there is any distance Lj that satisfies Lj<Lα or Lβ<Lj, the central control module determines that the smoothness of the valve plug is in the ultra-limit smoothness interval;

If any distance Lj satisfies Lα≤Lj≤Lβ, the central control module determines that the smoothness of the valve plug is within the preset allowable smoothness interval;

Wherein, the third judgment condition is that the central control module judges that the joint position of the valve body and the valve plug is damaged and the laser detection module completes the calculation of the distance Lj;

The over-limit smoothness interval is that there is a depression or a protrusion on the valve plug, and the preset allowable smoothness interval is that the valve plug is normal.

Further, the central control module determines the corresponding specific damage position of the multi-way reversing valve to be tested according to the smoothness of the valve plug,

If the smoothness of the valve plug is within the allowable smoothness range, the central control module determines that the damaged position of the multi-way reversing valve to be tested is the valve body;

If the smoothness of the valve plug is in the first preset smoothness interval or the second preset smoothness interval, the central control module replaces the valve plug with a valve plug in the preset allowable smoothness interval, and After replacing the valve plug, the multi-way directional control valve to be tested is closed again in the first preset closing manner, and at the same time, each of the openings is tested to determine the tightness of the multi-way directional control valve to be tested .

Further, the central control module adopts the second control mode to control the operation of the sealing module and the pressurizing module under the first qualified condition, and the pressure detection module controls the operation of each of the sealing modules in the second preset sealing mode. The opening is detected to determine the unobstructed state of the oil passage of the multi-way reversing valve to be tested.

If the pressures of the openings detected by the pressure detection module are the same, the central control module determines that the oil circuit is in the first preset unobstructed state;

If the pressures of the openings detected by the pressure detection module are different, the central control module determines that the oil circuit is in the second preset unobstructed state;

Wherein, the second control mode is sequentially controlling the multi-way reversing valve to be in the first preset working condition and the second preset working condition, and controlling the closed module to operate in the corresponding working condition respectively. The second preset closing mode closes the multi-way reversing valve, and controls the pressurization module to pressurize the multi-way reversing valve from the opened opening;

The first preset unobstructed state is a corresponding state in which the multi-way reversing valve to be tested runs stably, and the second preset unobstructed state is a corresponding state in which the oil circuit of the multi-way reversing valve to be tested is blocked;

The first qualified condition is a corresponding condition that the multi-way reversing valve to be tested is in a first preset strictness.

Further, the pressure detection module further includes several pressure sensors, which respectively correspond to the sealing covers of the sealing module, and are arranged at the position where the center of the sealing cover has the largest deformation, so as to measure the pressure on each sealing cover.

Compared with the prior art, the beneficial effect of the present invention is that, by means of setting a closed module, a pressurization module, a pressure detection module, a laser detection module and a central control module, the tightness of the opening of the multi-way reversing valve, the valve body The tightness and the smoothness of the valve core are tested, which effectively reduces the detection complexity of the multi-way directional valve and effectively improves the accuracy of the fault location of the multi-way directional valve.

Further, the openings of the multi-way reversing valve are covered separately by means of setting the sealing cover, while effectively isolating the oil circuit of the multi-way reversing valve, the discrimination of the detection of the multi-way reversing valve is improved, thereby The accuracy of fault location of the multi-way reversing valve is further improved.

Furthermore, by judging the measured pressure quantity, the tightness of the oil circuit in the multi-way reversing valve is judged, which effectively reduces the difficulty of oil circuit detection and further improves the fault location of the multi-way reversing valve. the accuracy.

Furthermore, by comparing the variance of the pressure at each closed opening, the clogging situation in the multi-way reversing valve is determined, which effectively reduces the complexity of detecting the multi-way reversing valve and further improves the multi-way reversing valve. The accuracy of the fault location of the road reversing valve.

Furthermore, by detecting the openings of the multi-way directional valve separately, the damaged position of the opening of the multi-way directional valve is located, while effectively reducing the difficulty of detecting the tightness of the opening of the multi-way directional valve, The accuracy of fault location of the multi-way reversing valve is further improved.

Further, by using the laser to detect the appearance of the valve plug, the appearance smoothness of the valve plug is judged, while effectively improving the detection accuracy of the valve plug appearance, the valve plug and the valve body are in operation. The rigor is judged, thereby further improving the accuracy of fault location of the multi-way reversing valve.

Furthermore, by judging the damaged parts of the multi-way reversing valve through the smoothness of the valve plug, at the same time, the parts that cannot be judged are further tested with qualified parts to accurately locate the damaged position of the multi-way reversing valve. While judging the damage position of the multi-way reversing valve is reasonable, the accuracy of fault location of the multi-way reversing valve is further improved.

Further, the oil circuit is tested by closing each opening of the multi-way reversing valve, so as to judge whether the oil circuit is working normally, which not only effectively reduces the difficulty of testing the oil circuit, but also further improves the Accuracy of multi-way reversing valve fault location.

Furthermore, by setting a sealing cover capable of deformation in the center, while effectively improving the accuracy of pressure detection, the accuracy of fault location of the multi-way reversing valve is further improved.

Furthermore, the method of arranging pressure sensors on each sealing cover effectively reduces the difficulty of pressure detection and at the same time further improves the accuracy of fault location of the multi-way reversing valve.

Description of drawings

Fig. 1 is the connection schematic diagram of multi-way reversing valve intelligent test system of the present invention;

Fig. 2 is the connection schematic diagram of the test system of the embodiment of the present invention and the multi-way reversing valve to be tested;

Fig. 3 is a closed schematic diagram of a multi-way reversing valve according to an embodiment of the present invention;

Fig. 4 is the test diagram of the laser detection module of the embodiment of the present invention;

Among them: 1: multi-way reversing valve; 2: sealing cover; 3: pressure sensor; 4: valve plug; 5: first laser; 6: second laser; 7: first reflection point; 8: second reflection point .

Detailed ways

In order to make the objects and advantages of the present invention clearer, the present invention will be further described below in conjunction with the examples; it should be understood that the specific examples described here are only for explaining the present invention, and are not intended to limit the present invention.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

It should be noted that, in the description of the present invention, terms such as "upper", "lower", "left", "right", "inner", "outer" and other indicated directions or positional relationships are based on the terms shown in the accompanying drawings. The direction or positional relationship shown is only for convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In addition, it should be noted that, in the description of the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a It is a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary, and it may be the internal communication of two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

Please refer to Fig. 1 and Fig. 2, which are respectively the connection schematic diagrams of the multi-way directional valve intelligent test system of the present invention and the connection schematic diagrams of the test system of the embodiment of the present invention and the multi-way directional valve to be tested. The directional valve intelligent test system includes:

A closing module, which is arranged at each opening on the surface of the multi-way reversing valve to be tested, so as to close each opening in a first preset closing manner or a second preset closing manner;

The pressurization module is connected with the closed module and the multi-way reversing valve to be tested, and is used to supply the pressure to the to-be-tested multi-way reversing valve through the opened opening when the multi-way reversing valve to be tested is in the first preset working condition and the second preset working condition. Measure the oil circuit inside the multi-way reversing valve to pressurize;

a pressure detection module, which is arranged at each opening of the closed module to measure the pressure received by each opening;

A laser detection module, which includes several laser generating units of the same specification and a laser receiving unit, which are used to irradiate the valve plug of the multi-way reversing valve to be tested with laser light in a preset direction and receive reflected laser points;

The central control module is connected to the closed module, the pressurized module, the pressure detection module and the laser detection module respectively, and is used to control the closed module and the pressurized module to work in a set order, and to analyze each pressure and each laser point, And judge the damaged position of the multi-way reversing valve to be tested according to the analysis results;

Among them, the first preset closing method is to open an opening to be tested of the multi-way reversing valve to be tested and close other openings of the multi-way reversing valve to be tested except the opening to be tested, and the second preset closing method is to close the opening to be tested. The multi-way reversing valve is used to connect all the openings of the output object and open other openings of the multi-way reversing valve to be tested. The first preset working condition is the corresponding working condition when the valve plug is at the first preset position. The second preset working condition is the corresponding working condition when the valve plug is at the second preset position;

Among them, the first preset position is the corresponding position of the valve plug when the oil in the multi-way reversing valve to be tested is in the preset forward direction, and the second preset position is the valve plug when the oil in the multi-way reversing valve to be tested is in the preset reverse direction. The corresponding position of the plug, the preset forward direction and the preset reverse direction are related to the working connection mode of the multi-way reversing valve to be tested;

Specifically, the output object is the piston corresponding to the oil circuit of the multi-way reversing valve, which is set behind the multi-way reversing valve to provide power to the hydraulic equipment; the preset positive direction is the flow of oil corresponding to the compression stroke of the piston. Corresponding direction, the preset reverse direction is the corresponding direction of the oil corresponding to the piston's power stroke.

By setting up a closed module, a pressurization module, a pressure detection module, a laser detection module, and a central control module, the opening tightness, valve body tightness, and valve core smoothness of the multi-way reversing valve are tested, which effectively reduces the While the detection complexity of the multi-way directional valve is improved, the accuracy of fault location of the multi-way directional valve is effectively improved.

Please refer to FIG. 3 , which is a closed schematic view of the multi-way reversing valve according to the embodiment of the present invention.

The sealing cover 2 closes the openings on the multi-way reversing valve 1 , and at the same time, the pressure sensor 3 is arranged at the center of the sealing cover 2 .

The sealing module includes several sealing covers, and the sealing covers cover each opening on the surface of the valve body of the multi-way reversing valve to be tested in a preset manner;

The pressurization module gradually increases the pressure applied to the multi-way directional valve to be tested at preset time intervals when testing the multi-way directional valve to be tested;

When the sealing cover of the closing module is closed to the corresponding opening, the edge of the sealing cover body is rigidly connected to the corresponding opening, and the middle part of the sealing cover body can bulge upward or downward when bearing the preset minimum deformation pressure;

Wherein, the preset minimum deformation pressure is a value corresponding to the minimum pressure of the pressurized module.

The openings of the multi-way directional valve are covered separately by setting the sealing cover. While effectively isolating the oil circuit of the multi-way directional valve, the detection discrimination of the multi-way directional valve is improved, thereby further improving the Accuracy of multi-way reversing valve fault location.

By arranging pressure sensors on each sealing cover, the difficulty of pressure detection is effectively reduced, and the accuracy of fault location of the multi-way reversing valve is further improved.

Specifically, the central control module adopts the first control method to control the work of the closed module and the pressurization module, and sets the currently opened opening as the i-th opening, and the pressurization module pressurizes the internal pressure of the multi-way reversing valve to be measured to a preset value. Let the pressure Pi, where, i=1, 2,..., n, n is the number of openings corresponding to the multi-way reversing valve to be tested, n≥4 and n is an integer, the central control module pressurizes the pressure detection module by The total number na of the pressure Pi' measured by any closed opening is judged to classify the strictness interval of the multi-way reversing valve to be tested,

If na≤1, the central control module determines that the multi-way reversing valve to be tested meets the first preset stringency;

If na≥2, the central control module determines that the multi-way reversing valve to be tested does not meet the first preset strictness, and further judges according to the variance σ _i ² of each Pi';

Wherein, the first control method is to control the closing module to close the multi-way reversing valve in a first preset closing way, and control the pressurization module to pressurize the multi-way reversing valve from the opened opening;

The first preset tightness is the corresponding tightness without leakage between the valve plug and the valve body in the multi-way reversing valve to be tested.

Specifically, when the pressure at any closed opening is ≠0, it is recorded as the pressure that can be measured, and at this time, the strictness interval of the multi-way reversing valve to be tested is classified according to the total number na of the measured pressure Pi' , by judging the measured pressure quantity, the tightness of the oil circuit in the multi-way reversing valve is judged, which effectively reduces the difficulty of oil circuit detection and further improves the accuracy of fault location of the multi-way reversing valve Spend.

Specifically, the central control module determines the state of the multi-way reversing valve to be tested according to the mean square error σ _i ² of each Pi' detected by the pressure detection module under the first judgment condition, and the central control module is provided with a first preset comparison value α1 and the second preset comparison value α2, wherein, 0<α1<α2, the central control module compares σ _i ² with α1 and α2,

If α2≤σi ₂ , the central control module determines that the multi-way reversing valve to be tested is in the second preset ^strictness ;

If _α1≤σi ² <α2, the central control module determines that the multi-way reversing valve to be tested is in the third preset strictness;

If 0≤σ _i ² <α1, the central control module determines that the multi-way reversing valve to be tested is damaged, and determines the damaged part according to the detection results of the laser detection module;

Wherein, the first judgment condition is that the central control module judges that the multi-way reversing valve to be tested does not meet the first preset strictness;

The second preset strictness is the corresponding tightness of the multi-way reversing valve to be tested to be able to work normally; the third preset strictness is the corresponding strictness of the opening damage of the multi-way reversing valve to be tested.

By comparing the variance of the pressure at each closed opening, the blockage in the multi-way reversing valve is determined, which effectively reduces the complexity of multi-way reversing valve detection and further improves the multi-way reversing valve. Accuracy of valve fault location.

Specifically, the central control module judges according to the difference Δα obtained by making the difference between the mean square error σ _i ² corresponding to the i-th opening and the mean square error σ i+1 ² corresponding to the _i+1 -th opening in the second judgment condition, To determine the damage position of the multi-way reversing valve opening to be tested, set Δα=σ _i ² -σ _i+1 ² , the central control module is provided with a third preset comparison value α3, where, 0<α3, the central control The module compares Δα to α3,

If -α3≤Δα≤α3, the central control module determines that the joint position of the valve body and the valve plug is damaged, and determines the damaged part according to the detection result of the laser detection module;

If Δα<-α3, the central control module determines that the i-th opening position is damaged;

If α3<Δα, the central control module determines that the i+1 opening position is damaged;

Wherein, the second judging condition is that the central control module judges that the multi-way reversing valve to be tested is in the third preset strictness.

By detecting each opening of the multi-way directional valve separately, the damaged position of the opening of the multi-way directional valve is located, which effectively reduces the difficulty of detecting the tightness of the opening of the multi-way directional valve and further improves the Accuracy of multi-way reversing valve fault location.

Please refer to FIG. 4 , which is a test diagram of a laser detection module according to an embodiment of the present invention.

Wherein, the laser generating unit emits the first laser 5 and the second laser 6, respectively irradiating on the corresponding upper tangential direction and the lower tangential direction of the valve plug 4, which respectively form the first reflection point 7 and the second reflection point on the laser receiving unit 8.

Specifically, the detection method of the laser detection module is:

Step S1, removing the valve plug from the multi-way reversing valve to be tested and fixing it at the set detection position of the laser detection module;

Step S2, the laser generating unit takes the central axis of the valve plug as a reference, and at the same time irradiates a beam of parallel laser light to the upper tangential direction and the lower tangential direction of the cross-section of the valve plug in a preset direction. a laser, corresponding to the j'th laser irradiated in the tangential direction of the cross-section of the valve plug, and coplanar on the cross-section;

Step S3, the laser receiving unit receives the light reflected by the laser generating unit through the surface of the valve plug, and calculates the distance Lj between the reflection point corresponding to the jth laser and the reflection point corresponding to the j'th laser;

Wherein, j=1, 2, 3, . . . , m, m≥2 and m is an integer.

Specifically, the central control module determines the smoothness of the valve plug according to the measured distance Lj of the valve plug in the third judgment condition. Assuming the distance Lβ, where 0<Lα<Lβ, the central control module compares Lj with Lα and Lβ sequentially,

If there is any Lj<Lα or Lβ<Lj, the central control module determines that the smoothness of the valve plug is in the ultra-limit smoothness range;

If any Lα≤Lj≤Lβ, the central control module determines that the smoothness of the valve plug is within the preset allowable smoothness range;

Wherein, the third judgment condition is that the central control module judges that the joint position of the valve body and the valve plug is damaged and the laser detection module completes the calculation of the distance Lj;

The first preset smoothness interval is that there is a depression on the valve plug, the preset allowable smoothness interval is that the valve plug is normal, and the second preset smoothness interval is that there is a protrusion on the valve plug.

Specifically, according to the smoothness of the valve plug, the central control module judges the damage of the multi-way reversing valve to be tested and/or the corresponding specific damage location of the damage of the joint position between the valve body and the valve plug,

If the smoothness of the valve plug is within the allowable smoothness range, the central control module determines that the damaged position of the multi-way reversing valve to be tested is the valve body;

If the smoothness of the valve plug is in the first preset smoothness interval or the second preset smoothness interval, the central control module replaces the valve plug with a valve plug in the preset allowable smoothness interval, and checks the valve plug after the valve plug is replaced. The multi-way reversing valve to be tested is closed again in the first preset closing manner, and at the same time, each opening is tested to determine the tightness of the multi-way reversing valve to be tested.

By using the laser to detect the appearance of the valve plug, the smoothness of the appearance of the valve plug is judged, which effectively improves the detection accuracy of the appearance of the valve plug, and at the same time checks the tightness of the valve plug and the valve body during work. Judgment, thereby further improving the accuracy of multi-way reversing valve fault location.

Specifically, the central control module adopts the second control method to control the work of the closed module and the pressurized module under the first qualified condition, and the pressure detection module detects the openings in the second preset closed method to determine the number of switches to be tested. The oil passage to the valve is unobstructed,

If the pressure of each opening detected by the pressure detection module is the same, the central control module determines that the oil circuit is in the first preset unobstructed state;

If the pressure of each opening detected by the pressure detection module is different, the central control module determines that the oil circuit is in the second preset unobstructed state;

Wherein, the second control method is to sequentially control the multi-way reversing valve to be in the first preset working condition and the second preset working condition, and respectively control the closing module to operate the multi-way switching valve in the second preset closing mode under the corresponding working conditions. Close the valve and control the pressurization module to pressurize the multi-way directional valve from the opened opening;

The first preset unobstructed state is the corresponding state in which the multi-way reversing valve to be tested runs stably, and the second preset unobstructed state is the corresponding state in which the oil passage of the multi-way reversing valve to be tested is blocked;

The first qualified condition is the corresponding condition that the multi-way reversing valve to be tested is in the first preset strictness.

The damaged parts of the multi-way reversing valve are judged by the smoothness of the valve plug, and at the same time, the parts that cannot be judged are further tested with qualified parts to accurately locate the damaged position of the multi-way reversing valve, which effectively improves the accuracy of the multi-way reversing valve. While improving the rationality of judging the damaged position of the directional valve, the accuracy of fault location of the multi-way directional valve is further improved.

Specifically, the central control module uses the second control mode to control the work of the sealing module and the pressurizing module, and the pressure detection module detects each opening in the second preset sealing mode to determine the oil circuit of the multi-way reversing valve to be tested. patency,

If the pressure of each opening detected by the pressure detection module is the same, the central control module determines that the oil circuit is in the first preset unobstructed state;

If the pressure of each opening detected by the pressure detection module is different, the central control module determines that the oil circuit is in the second preset unobstructed state;

Wherein, the second control method is to sequentially control the multi-way reversing valve to be in the first preset working condition and the second preset working condition, and respectively control the closing module to operate the multi-way switching valve in the second preset closing mode under the corresponding working conditions. Close the valve and control the pressurization module to pressurize the multi-way directional valve from the opened opening;

The first preset unobstructed state is a corresponding state in which the multi-way reversing valve to be tested runs stably, and the second preset unobstructed state is a corresponding state in which the oil passage of the multi-way reversing valve to be tested is blocked.

By closing the openings of the multi-way reversing valve, the oil circuit is tested to judge whether the oil circuit is working normally. Accuracy of valve fault location.

Specifically, the pressure detection module also includes a number of pressure sensors, which respectively correspond to the sealing covers of the sealing module, and are arranged at the position of the maximum deformation in the center of the sealing covers to measure the pressure on each sealing cover.

By setting a sealing cover that can be deformed in the center, while effectively improving the accuracy of pressure detection, the accuracy of fault location of the multi-way reversing valve is further improved.

By arranging pressure sensors on each sealing cover, the difficulty of pressure detection is effectively reduced, and the accuracy of fault location of the multi-way reversing valve is further improved.

Taking a single multi-way reversing valve to be tested as an example, the test process of using the technical solution of the present invention for multi-way reversing is as follows:

Put the multi-way directional valve into the test system, and at the same time, the sealing module seals all the openings of the multi-way directional valve;

Open the sealing caps in sequence, and pressurize them separately, test the pressure of the remaining closed openings, and compare the pressures, there are 4 situations:

In case Si1, if the other closed openings are not under pressure, the central control module determines that the multi-way reversing valve is tight;

Si2, if only a single closed opening is under pressure, the central control module determines that the multi-way reversing valve is tight;

In case Si3, if multiple closed openings are subjected to different pressures, the central control module judges the tightness according to the degree of dispersion. Among them, if the degree of dispersion is low, the central control module determines that the internal leakage of the multi-way reversing valve is high; The control module determines that the multi-way reversing valve is not leaking;

In case Si4, if multiple closed openings are subjected to the same pressure, the central control module determines that the internal leakage of the multi-way reversing valve;

After determining the leakage degree of the multi-way reversing valve, in order to determine the damaged parts of the valve body and valve plug, take out the valve plug of the multi-way reversing valve, place it in the center of the laser receiving unit, and at the same time, turn on the laser generating unit;

The laser generating unit emits two laser beams to irradiate the edge of the valve plug at a preset angle. The cross section of the edge is in the same plane as the connecting line between the laser generating unit and the central axis of the valve plug. Both laser beams are reflected by the valve plug to the laser receiving unit. Two spots are formed, each of which contains a spot with the highest brightness; the central control module judges the distance of the spot with the highest brightness, if during the test, the distance between any pair of laser spots formed by the laser receiving unit exceeds The allowable value indicates that the smoothness of the valve plug is unqualified.

Among them, the cross-section is perpendicular to the central axis of the valve plug, and it is located on the perpendicular line between the laser emitting unit and the central axis of the valve plug. For a single cross-section, there is a boundary line between it and the outer contour of the valve plug, and the boundary line is ideally a For the circular closed line, the first laser and the second laser in FIG. 4 are irradiated to the tangential direction of the boundary line, that is, there is one and only one intersection point between each laser extension line and the boundary line.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings, but those skilled in the art will easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to related technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention; for those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A multi-way reversing valve intelligent test system is characterized in that, comprising: A closing module, which is arranged at each opening on the surface of the multi-way reversing valve to be tested, so as to close each opening in a first preset closing manner or a second preset closing manner; A pressurizing module, which is connected with the closed module and the multi-way reversing valve to be tested, for when the multi-way reversing valve to be tested is in the first preset working condition and the second preset working condition, pressurizing the oil circuit inside the multi-way reversing valve to be tested through the opened opening; a pressure detection module, which is arranged at each of the openings of the closed module, and is used to measure the pressure on each opening; A laser detection module, which includes several laser generating units of the same specification and a laser receiving unit, which are used to irradiate the valve plug of the multi-way reversing valve to be tested with laser light in a preset direction and receive reflected laser points; a central control module, which is respectively connected to the sealing module, the pressurization module, the pressure detection module and the laser detection module, to control the closure module and the pressurization module to work in a set order, And, analyze the pressures and the laser points, and determine the damage position of the multi-way reversing valve to be tested according to the analysis results; Wherein, the first preset closing method is to open one of the openings to be tested of the multi-way directional control valve to be tested and close other openings of the multi-way directional control valve to be tested except the opening to be tested, the first The second preset closing method is to close all openings in the multi-way directional valve to be tested for connecting output objects and open other openings of the multi-way directional valve to be tested. The first preset working condition is The corresponding working condition when the valve plug is at the first preset position, and the second preset working condition is the corresponding working condition when the valve plug is at the second preset position; Wherein, the first preset position is the corresponding position of the valve plug when the oil in the multi-way reversing valve to be tested is in the preset positive direction, and the second preset position is the corresponding position of the multi-way reversing valve to be tested The corresponding position of the valve plug when the medium oil is in the preset reverse direction, the preset forward direction and the preset reverse direction are related to the working connection mode of the multi-way reversing valve to be tested. 2. The multi-way reversing valve intelligent testing system according to claim 1, wherein the closed module includes several sealing covers, and the sealing covers cover the valve of the multi-way directional valve to be tested in a preset manner. openings on the body surface; The pressurization module gradually increases the pressure applied to the multi-way directional valve to be tested at preset time intervals when testing the multi-way directional valve to be tested; When the sealing cover of the closure module is closed to the corresponding opening, the edge of the sealing cover is rigidly connected to the corresponding opening, and the middle part of the sealing cover can be upward or downward when bearing a preset minimum deformation pressure. under the bulge; Wherein, the preset minimum deformation pressure is a value corresponding to the minimum pressure of the pressurization module. 3. The multi-way reversing valve intelligent testing system according to claim 2, characterized in that, the central control module uses the first control mode to control the work of the closed module and the pressurized module, and set the currently opened The opening is the i-th opening, and the pressurization module pressurizes the internal pressure of the multi-way reversing valve to be measured to the preset pressure Pi, where i=1, 2,..., n, n is the multi-way reversing valve to be tested The number of openings corresponding to the valve, n≥4 and n is an integer, the central control module determines the total number na of the pressure Pi' measured by any closed opening of the pressure detection module during pressurization, and treats Classify the strictness range of the multi-way reversing valve, If na≤1, the central control module determines that the multi-way reversing valve to be tested complies with the first preset stringency; If na≥2, the central control module determines that the multi-way reversing valve to be tested does not meet the first preset strictness, and further judges according to the variance σ _i ² of each Pi'; Wherein, the first control mode is to control the closing module to close the multi-way switching valve in the first preset closing mode, and control the pressurizing module to switch from the opened opening to the multi-way switching valve. pressurize the valve; The first preset tightness is the corresponding tightness without leakage between the valve plug and the valve body of the multi-way reversing valve to be tested. 4. The multi-way reversing valve intelligent testing system according to claim 3, characterized in that, said central control module detects according to the mean square error σ i of each Pi' detected by said pressure detection module under the first judgment condition σ _i ² To determine the state of the multi-way reversing valve to be tested, the central control module is provided with a first preset comparison value α1 and a second preset comparison value α2, wherein, 0<α1<α2, the central control module sets σ _i ² Compared with α1 and α2, If _α2≤σi ² , the central control module determines that the multi-way reversing valve to be tested is in the second preset stringency; If _α1≤σi ² <α2, the central control module determines that the multi-way reversing valve to be tested is in the third preset strictness; If 0≤σ _i ² <α1, the central control module determines that the multi-way reversing valve to be tested is damaged, and determines the damaged part according to the detection result of the laser detection module; Wherein, the first judgment condition is that the central control module judges that the multi-way reversing valve to be tested does not meet the first preset strictness; The second preset tightness is the corresponding tightness of the multi-way reversing valve to be tested that can work normally; the third preset tightness is the corresponding tightness of the damaged opening of the multi-way reversing valve to be tested Spend. 5. The multi-way reversing valve intelligent testing system according to claim 4, wherein the central control module is based on the mean square error σ _i ² corresponding to the ith opening and the i+th opening in the second judgment condition The mean square error σ _i+1 ² corresponding to one opening is judged by the difference Δα obtained by making the difference to determine the damage position of the multi-way reversing valve opening to be tested. Set Δα=σ _i ² -σ _i+1 ² , The central control module is provided with a third preset comparison value α3, wherein, 0<α3, the central control module compares Δα with α3, If -α3≤Δα≤α3, the central control module determines that the joint position of the valve body and the valve plug is damaged, and determines the damaged part according to the detection result of the laser detection module; If Δα<-α3, the central control module determines that the ith opening position is damaged; If α3<Δα, the central control module determines that the i+1th opening position is damaged; Wherein, the second judging condition is that the central control module judges that the multi-way reversing valve to be tested is in the third preset strictness. 6. The multi-way reversing valve intelligent testing system according to claim 5, wherein the detection mode of the laser detection module is: Step S1, removing the valve plug from the multi-way reversing valve to be tested and fixing it at the set detection position of the laser detection module; In step S2, the laser generating unit takes the central axis of the valve plug as a reference, and at the same time irradiates a beam of parallel laser light to the upper tangential direction and the lower tangential direction of the cross-section of the valve plug in a preset direction. The jth laser beam in the upper tangential direction corresponds to the j'th laser beam directed at the lower tangential direction of the cross-section of the valve plug, and is coplanar on the cross-section; Step S3, the laser receiving unit receives the light reflected by the laser generating unit through the surface of the valve plug, and calculates the distance Lj between the reflection point corresponding to the jth laser and the reflection point corresponding to the j'th laser ; Wherein, j=1, 2, 3, . . . , m, m≥2 and m is an integer. 7. The multi-way reversing valve intelligent testing system according to claim 6, wherein the central control module determines the smoothness of the valve plug according to the distance Lj measured for the valve plug in the third judgment condition, The central control module is provided with a qualified distance Lα corresponding to the multi-way reversing valve to be tested and a second preset distance Lβ, wherein, 0<Lα<Lβ, the central control module sequentially compares Lj, Lα and Lβ Compare, If there is any distance Lj that satisfies Lj<Lα or Lβ<Lj, the central control module determines that the smoothness of the valve plug is in the ultra-limit smoothness interval; If any distance Lj satisfies Lα≤Lj≤Lβ, the central control module determines that the smoothness of the valve plug is within the preset allowable smoothness interval; Wherein, the third judgment condition is that the central control module judges that the joint position of the valve body and the valve plug is damaged and the laser detection module completes the calculation of the distance Lj; The over-limit smoothness interval is that there is a depression or a protrusion on the valve plug, and the preset allowable smoothness interval is that the valve plug is normal. 8. The multi-way reversing valve intelligent testing system according to claim 7, wherein the central control module determines the corresponding specific damage position of the multi-way directional valve to be tested according to the smoothness of the valve plug , If the smoothness of the valve plug is within the allowable smoothness range, the central control module determines that the damaged position of the multi-way reversing valve to be tested is the valve body; If the smoothness of the valve plug is in the first preset smoothness interval or the second preset smoothness interval, the central control module replaces the valve plug with a valve plug in the preset allowable smoothness interval, and After replacing the valve plug, the multi-way directional control valve to be tested is closed again in the first preset closing manner, and at the same time, each of the openings is tested to determine the tightness of the multi-way directional control valve to be tested . 9. The multi-way reversing valve intelligent testing system according to claim 8, characterized in that, the central control module adopts the second control mode to control the work of the closed module and the pressurized module under the first qualified condition, The pressure detection module detects the openings in the second preset closed mode to determine the unobstructed state of the oil passage of the multi-way reversing valve to be tested, If the pressures of the openings detected by the pressure detection module are the same, the central control module determines that the oil circuit is in the first preset unobstructed state; If the pressures of the openings detected by the pressure detection module are different, the central control module determines that the oil circuit is in the second preset unobstructed state; Wherein, the second control mode is sequentially controlling the multi-way reversing valve to be in the first preset working condition and the second preset working condition, and controlling the closed module to operate in the corresponding working condition respectively. The second preset closing mode closes the multi-way reversing valve, and controls the pressurization module to pressurize the multi-way reversing valve from the opened opening; The first preset unobstructed state is a corresponding state in which the multi-way reversing valve to be tested runs stably, and the second preset unobstructed state is a corresponding state in which the oil circuit of the multi-way reversing valve to be tested is blocked; The first qualified condition is a corresponding condition that the multi-way reversing valve to be tested is in a first preset strictness. 10. The multi-way reversing valve intelligent testing system according to claim 9, wherein the pressure detection module further comprises a plurality of pressure sensors corresponding to each of the sealing covers of the closed module respectively, and, Set it at the maximum deformation position in the center of the sealing cover to measure the pressure on each sealing cover.

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