CN115791149B - Intelligent testing system for multi-way reversing valve - Google Patents
Intelligent testing system for multi-way reversing valve Download PDFInfo
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- CN115791149B CN115791149B CN202310047686.9A CN202310047686A CN115791149B CN 115791149 B CN115791149 B CN 115791149B CN 202310047686 A CN202310047686 A CN 202310047686A CN 115791149 B CN115791149 B CN 115791149B
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Abstract
The invention relates to the technical field of hydraulic valves, in particular to an intelligent testing system for a multi-way reversing valve, which comprises the following components: the sealing module is used for sealing each opening in a first preset sealing mode or a second preset sealing mode respectively; the pressurizing module is used for pressurizing each opening of the multi-way reversing valve to be tested and the oil way of the multi-way reversing valve under the first preset working condition and the second preset working condition respectively; the pressure detection module is used for measuring the pressure received by the sealing module at each opening; the laser detection module is used for irradiating the valve plug and receiving reflected lasers; the central control module is used for analyzing the result to judge the damage position of the multi-way reversing valve; by means of the mode of arranging the modules, the tightness of the opening, the tightness of the valve body and the smoothness of the valve core of the multi-way reversing valve are detected, so that the detection complexity of the multi-way reversing valve is effectively reduced, and meanwhile, the fault positioning accuracy of the multi-way reversing valve is effectively improved.
Description
Technical Field
The invention relates to the technical field of hydraulic valves, in particular to an intelligent testing system for a multi-way reversing valve.
Background
The multi-way reversing valve is used as an important component in a hydraulic system, the components of the multi-way reversing valve are closely matched, the structure of each component of the valve is very compact, and the actual damaged part of the multi-way reversing valve is difficult to determine by a test mode which is adopted at present for detecting the multi-way reversing valve.
Chinese patent publication No.: CN105136442a discloses a method for testing a delivery test of a hydraulic multi-way reversing valve, which uses a pressure-proof test to apply pressure-proof test pressure to each pressure-bearing oil port, and increases the pressure-proof test pressure to maintain the pressure during the test; the oil way type and slide valve function, reversing performance and internal leakage are measured, the multi-way valve in the middle position of the inclined building city is at the middle position, the AB oil inlet is blocked, the system pressure is regulated to the nominal pressure, and the leakage flow is measured from the T port; the pressure loss, the tested multi-way valve is positioned at the reversing position, the system flow is regulated to the nominal flow, and the pressure loss of P-A, B-T or P-B, A-T is measured; the performance of the safety valve is that the AB port of the tested multi-way valve is blocked, the system pressure is regulated to be higher than the nominal pressure of the safety valve, and the pressure regulating range, the pressure stability, the pressure runout and the closing characteristics of the safety valve are measured by the nominal flow. Chinese patent publication No.: CN109342050a discloses a system and a method for testing performance of a multi-mode multi-way reversing valve, which are applicable to performance testing of multi-way reversing valves in various testing oil circuit modes by means of setting two groups of testing bridges.
It can be seen that the above technical solution has the following problems: the actual damaged position of the multiple directional control valve cannot be determined.
Disclosure of Invention
Therefore, the invention provides an intelligent testing system for a multi-way reversing valve, which is used for solving the problem that the actual damaged position of the multi-way reversing valve cannot be determined in the prior art, so that the positioning efficiency of the damaged position of the multi-way reversing valve is low.
In order to achieve the above object, the present invention provides an intelligent testing system for a multiple directional control valve, comprising:
the sealing module is arranged at each opening on the surface of the valve body of the multi-way reversing valve to be tested, so as to seal each opening in a first preset sealing mode or a second preset sealing mode respectively;
the pressurizing module is connected with the sealing module and the multi-way reversing valve to be tested and is used for pressurizing an oil way in the multi-way reversing valve to be tested through an opened opening under a first preset working condition and a second preset working condition of the multi-way reversing valve to be tested;
the pressure detection module is arranged at each opening of the sealing module and is used for measuring the pressure received by each opening;
the laser detection module comprises a plurality of laser generating units and laser receiving units with the same specification, and is used for carrying out laser irradiation on the valve plug of the multi-way reversing valve to be detected according to a preset direction and receiving reflected laser points;
The central control module is respectively connected with the sealing module, the pressurizing module, the pressure detection module and the laser detection module and used for controlling the sealing module and the pressurizing module to work in a set sequence, analyzing each pressure and each laser point and judging the damage position of the multi-way reversing valve to be tested according to an analysis result;
the first preset sealing mode is to open one of openings to be tested of the multi-way reversing valve to be tested and seal other openings of the multi-way reversing valve to be tested except the opening to be tested, the second preset sealing mode is to seal all openings of the multi-way reversing valve to be tested for connecting output objects and open other openings of the multi-way reversing valve to be tested, the first preset working condition is a corresponding working condition of the valve plug at a first preset position, and the second preset working condition is a corresponding working condition of the valve plug at a second preset position;
the first preset position is a corresponding position of the valve plug when the oil liquid in the multi-way reversing valve to be detected is in a preset forward direction, and the second preset position is a corresponding position of the valve plug when the oil liquid in the multi-way reversing valve to be detected is in a preset reverse direction, and the preset forward direction and the preset reverse direction are related to the working connection mode of the multi-way reversing valve to be detected.
Further, the sealing module comprises a plurality of sealing covers which cover all openings on the surface of the valve body of the multi-way reversing valve to be tested in a preset mode;
when the pressurizing module tests the multi-way reversing valve to be tested, gradually increasing the pressure applied to the multi-way reversing valve to be tested at preset time intervals;
when the sealing cover of the sealing module is sealed with the corresponding opening, the edge of the cover body of the sealing cover is rigidly connected with the corresponding opening, and the middle part of the cover body of the sealing cover can bulge upwards or downwards when bearing the preset minimum deformation pressure;
the preset minimum deformation pressure is a value corresponding to the minimum pressure of the pressurizing module.
Further, the central control module adopts a first control mode to control the closing module and the pressurizing module to work, the opening which is currently opened is set as an ith opening, the pressurizing module pressurizes the pressure in the multi-way reversing valve to be tested to a preset pressure Pi, wherein i=1, 2, …, n, n is the number of openings corresponding to the multi-way reversing valve to be tested, n is more than or equal to 4 and n is an integer, the central control module judges the total number na of the pressures Pi' measured by any closed opening in the pressurizing process of the pressure detection module so as to classify the severe density interval of the multi-way reversing valve to be tested,
If na is less than or equal to 1, the central control module judges that the multi-way reversing valve to be tested accords with a first preset tightness;
if na is more than or equal to 2, the central control module judges that the multi-way reversing valve to be tested does not accord with a first preset tightness and according to the variance sigma of each Pi' i 2 Further judging;
the first control mode is to control the sealing module to seal the multi-way reversing valve in the first preset sealing mode and control the pressurizing module to pressurize the multi-way reversing valve from the opened opening;
the first preset tightness is the corresponding tightness between the valve plug and the valve body of the multi-way reversing valve to be tested, wherein the corresponding tightness is not leaked.
Further, the central control module determines a first judgment condition according to the mean square error sigma of each Pi' detected by the pressure detection module i 2 Determining the state of a multi-way reversing valve to be tested, wherein a first preset comparison value alpha 1 and a second preset comparison value alpha 2 are arranged in the central control module, wherein 0 is more than alpha 1 and less than alpha 2, and the central control module uses sigma i 2 In comparison with a 1 and a 2,
if alpha 2 is less than or equal to sigma i 2 The central control module judges that the data to be processedMeasuring that the multi-way reversing valve is at a second preset tightness;
if alpha 1 is less than or equal to sigma i 2 The central control module judges that the multi-way reversing valve to be detected is at a third preset density;
If 0 is less than or equal to sigma i 2 The central control module judges that the multi-way reversing valve to be detected is damaged and judges a damaged part according to the detection result of the laser detection module;
the first judging condition is that the central control module judges that the multi-way reversing valve to be tested does not accord with a first preset tightness;
the second preset tightness is the corresponding tightness of the to-be-tested multi-way reversing valve capable of working normally; and the third preset tightness is the corresponding tightness of the opening damage of the multi-way reversing valve to be tested.
Further, the central control module determines a second judgment condition according to the mean square error sigma corresponding to the ith opening i 2 Mean square error sigma corresponding to the (i+1) th opening i+1 2 The difference delta alpha obtained by the difference is judged to determine the damage position of the opening of the multi-way reversing valve to be detected, and delta alpha = sigma is set i 2 -σ i+1 2 A third preset comparison value alpha 3 is arranged in the central control module, wherein 0 is smaller than alpha 3, the central control module compares delta alpha with alpha 3,
if the alpha 3 is less than or equal to delta alpha and less than or equal to alpha 3, the central control module judges that the combination position of the valve body and the valve plug is damaged, and judges the damaged part according to the detection result of the laser detection module;
if delta alpha is less than-alpha 3, the central control module judges that the ith opening position is damaged;
If alpha 3 is less than delta alpha, the central control module judges that the (i+1) th opening position is damaged;
and the second judging condition is that the central control module judges that the multi-way reversing valve to be tested is in a third preset density.
Further, the detection mode of the laser detection module is as follows:
step S1, removing a valve plug from the multi-way reversing valve to be detected and fixing the valve plug at a set detection position of the laser detection module;
step S2, the laser generation unit takes the central axis of the valve plug as a reference, simultaneously irradiates a beam of parallel laser to the upper tangential direction and the lower tangential direction of the cross section of the valve plug in a preset direction, and corresponds to the jth laser irradiated to the upper tangential direction of the valve plug and the jth laser irradiated to 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 surface of the valve plug by the laser generating unit, and calculates the distance Lj between the reflecting point corresponding to the jth laser and the reflecting point corresponding to the jth laser;
wherein j=1, 2,3, …, m, m is not less than 2 and m is an integer.
Further, the central control module determines the smoothness of the valve plug according to the distance Lj measured on the valve plug under a third judging condition, the central control module is provided with a qualified distance Lalpha and a second preset distance Lbeta corresponding to the multi-way reversing valve to be tested, wherein 0 < Lalpha < Lbeta, the central control module sequentially compares Lj with Lalpha and Lbeta,
If any one of the distances Lj is consistent with Lj < Lα or Lβ < Lj, the central control module judges that the smoothness of the valve plug is in an overrun smoothness interval;
if any one of the distances Lj accords with Lalpha, lj and Lbeta, the central control module judges that the smoothness of the valve plug is in a preset allowable smoothness interval;
the third judging condition is that the central control module judges that the combination position of the valve body and the valve plug is damaged and the laser detection module finishes the calculation of the distance Lj;
the overrun smoothness interval is a valve plug with a concave or convex part, and the preset allowable smoothness interval is a valve plug normal.
Further, the central control module judges 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 in the allowable smoothness interval, the central control module judges that the damaged position of the multi-way reversing valve to be detected is a valve body;
and if the smoothness of the valve plug is in a first preset smoothness interval or a second preset smoothness interval, the central control module replaces the valve plug with the valve plug in the preset allowable smoothness interval, and seals the to-be-tested multi-way reversing valve after replacing the valve plug in the first preset sealing mode again, and simultaneously tests each opening to determine the tightness of the to-be-tested multi-way reversing valve.
Further, the central control module adopts a second control mode to control the sealing module and the pressurizing module to work under the first qualified condition, the pressure detection module detects the openings in the second preset sealing mode to determine the smooth state of the oil path of the multi-way reversing valve to be detected,
if the pressures of the openings detected by the pressure detection module are the same, the central control module judges that the oil way is in a first preset unobstructed state;
if the pressure of each opening detected by the pressure detection module is different, the central control module judges that the oil way is in a second preset unobstructed state;
the second control mode is to sequentially control the multi-way reversing valve to be in the first preset working condition and the second preset working condition, control the sealing module to seal the multi-way reversing valve in the second preset sealing mode under the corresponding working conditions respectively, and control the pressurizing module to pressurize the multi-way reversing valve from the opened opening;
the first preset unobstructed state is a corresponding state of stable operation of the multi-way reversing valve to be detected, and the second preset unobstructed state is a corresponding state of oil channel blockage of the multi-way reversing valve to be detected;
And the first qualified condition is a corresponding condition that the multi-way reversing valve to be tested is in a first preset strict density.
Further, the pressure detection module further comprises a plurality of pressure sensors, which are respectively corresponding to the sealing covers of the sealing module, and are arranged at the position with the largest central deformation amount of the sealing covers so as to measure the pressure applied to the sealing covers.
Compared with the prior art, the invention has the beneficial effects that the opening tightness, the valve body tightness and the valve core smoothness of the multi-way reversing valve are detected by arranging the sealing module, the pressurizing module, the pressure detecting module, the laser detecting module and the central control module, so that the detection complexity of the multi-way reversing valve is effectively reduced, and the fault positioning accuracy of the multi-way reversing valve is effectively improved.
Further, by means of the sealing cover, all openings of the multi-way reversing valve are respectively covered, oil ways of the multi-way reversing valve are effectively isolated, meanwhile, the degree of distinction of detection of the multi-way reversing valve is improved, and therefore the accuracy of fault positioning of the multi-way reversing valve is further improved.
Further, by judging the number of the measured pressures, the tightness of the oil way in the multi-way reversing valve is judged, so that the difficulty in detecting the oil way is effectively reduced, and meanwhile, the fault positioning accuracy of the multi-way reversing valve is further improved.
Further, by comparing the variances of the pressures at the closed openings, the blocking condition in the multi-way reversing valve is determined, so that the complexity of detecting the multi-way reversing valve is effectively reduced, and meanwhile, the fault positioning accuracy of the multi-way reversing valve is further improved.
Furthermore, through the mode of detecting each opening of the multi-way reversing valve respectively, the damage positions of the openings of the multi-way reversing valve are positioned, so that the difficulty of tightness detection of the openings of the multi-way reversing valve is effectively reduced, and meanwhile, the fault positioning accuracy of the multi-way reversing valve is further improved.
Further, through utilizing the laser to detect the outward appearance that the valve plug detected, judge the outward appearance smoothness of valve plug, when effectively promoting the outward appearance detection precision to the valve plug, judge the tightness of valve plug and valve body at the during operation to the degree of accuracy of multichannel switching-over valve fault location has further been promoted.
Further, through judging the damage part of multiple direction valve to the valve plug smoothness, simultaneously, utilize qualified part to carry out further test with the part that can't judge to the damage position of accurate positioning multiple direction valve, when effectively promoted the rationality of judging the multiple direction valve damage position, further promoted the degree of accuracy of multiple direction valve fault location.
Further, through the mode of sealing each opening of the multi-way reversing valve, the oil way is tested, so that whether the work of the oil way is normal or not is judged, the difficulty in testing the oil way is effectively reduced, and meanwhile, the fault positioning accuracy of the multi-way reversing valve is further improved.
Further, through the mode of setting up the sealed lid that the center can deform, when effectively promoting the accuracy to pressure detection, further promoted the degree of accuracy of multichannel switching-over valve fault location.
Furthermore, by means of arranging the pressure sensors on the sealing covers, the pressure detection difficulty is effectively reduced, and meanwhile, the fault positioning accuracy of the multi-way reversing valve is further improved.
Drawings
FIG. 1 is a schematic connection diagram of an intelligent testing system for a multiple directional control valve of the present invention;
FIG. 2 is a schematic diagram illustrating connection between a test system and a multiple directional control valve to be tested according to an embodiment of the present invention;
FIG. 3 is a schematic closing diagram of a multiple directional control valve according to an embodiment of the present invention;
FIG. 4 is a test chart of a laser detection module according to an embodiment of the invention;
wherein: 1: a multi-way reversing valve; 2: sealing cover; 3: a pressure sensor; 4: a valve plug; 5: a first laser; 6: a second laser; 7: a first reflection point; 8: and a second reflection point.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the 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 the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 and 2, which are respectively a connection schematic diagram of an intelligent testing system for a multiple directional control valve according to the present invention and a connection schematic diagram of a testing system and a multiple directional control valve to be tested according to an embodiment of the present invention, the intelligent testing system for a multiple directional control valve according to the present invention includes:
the sealing module is arranged at each opening on the surface of the valve body of the multi-way reversing valve to be tested, so as to seal each opening in a first preset sealing mode or a second preset sealing mode respectively;
the pressurizing module is connected with the sealing module and the multi-way reversing valve to be tested and is used for pressurizing an oil way inside the multi-way reversing valve to be tested through the opened opening under the first preset working condition and the second preset working condition of the multi-way reversing valve to be tested;
the pressure detection module is arranged at each opening of the sealing module and is used for measuring the pressure received by each opening;
the laser detection module comprises a plurality of laser generating units and laser receiving units with the same specification, and is used for carrying out laser irradiation on valve plugs of the multi-way reversing valve to be detected according to a preset direction and receiving reflected laser points;
the central control module is respectively connected with the sealing module, the pressurizing module, the pressure detection module and the laser detection module and used for controlling the sealing module and the pressurizing module to work in a set sequence, analyzing each pressure and each laser point and judging the damage position of the multi-way reversing valve to be tested according to the analysis result;
The first preset sealing mode is to open one opening to be tested of the multi-way reversing valve to be tested and seal other openings of the multi-way reversing valve to be tested except the opening to be tested, the second preset sealing mode is to seal all openings of the multi-way reversing valve to be tested for connecting an output object and open other openings of the multi-way reversing valve to be tested, the first preset working condition is a corresponding working condition of the valve plug at a first preset position, and the second preset working condition is a corresponding working condition of the valve plug at a second preset position;
the first preset position is the corresponding position of the valve plug when the oil liquid in the multi-way reversing valve to be detected is in a preset forward direction, and the second preset position is the corresponding position of the valve plug when the oil liquid in the multi-way reversing valve to be detected is in a preset reverse direction, and the preset forward direction and the preset reverse direction are related to the working connection mode of the multi-way reversing valve to be detected;
specifically, the output object is a piston corresponding to the oil way of the multi-way reversing valve, which is arranged behind the multi-way reversing valve and is used for providing power for the hydraulic equipment; the preset forward direction is the corresponding direction of oil corresponding to the compression stroke of the piston, and the preset reverse direction is the corresponding direction of oil corresponding to the power stroke of the piston.
The sealing module, the pressurizing module, the pressure detecting module, the laser detecting module and the central control module are arranged to detect the opening tightness, the valve body tightness and the valve core smoothness of the multi-way reversing valve, so that the accuracy of fault positioning of the multi-way reversing valve is effectively improved while the detection complexity of the multi-way reversing valve is effectively reduced.
Fig. 3 is a schematic diagram showing a multi-way reversing valve according to an embodiment of the invention.
The sealing cover 2 seals the openings on the multi-way reversing valve 1, and meanwhile, the pressure sensor 3 is arranged at the center of the sealing cover 2.
The sealing module comprises a plurality of sealing covers which cover all openings on the surface of the valve body of the multi-way reversing valve to be tested in a preset mode;
the pressurizing module gradually increases the pressure applied to the multi-way reversing valve to be tested at preset time intervals when the multi-way reversing valve to be tested is tested;
when the sealing cover of the sealing module is sealed with the corresponding opening, the edge of the cover body of the sealing cover is rigidly connected with the corresponding opening, and the middle part of the cover body of the sealing cover can bulge upwards or downwards when bearing the preset minimum deformation pressure;
the preset minimum deformation pressure is a value corresponding to the minimum pressure of the pressurizing module.
By means of the sealing cover, all openings of the multi-way reversing valve are respectively covered, oil ways of the multi-way reversing valve are effectively isolated, meanwhile, the degree of distinction of detection of the multi-way reversing valve is improved, and therefore the fault positioning accuracy of the multi-way reversing valve is further improved.
By means of the mode that the pressure sensors are arranged on the sealing covers, pressure detection difficulty is effectively reduced, and meanwhile, fault positioning accuracy of the multi-way reversing valve is further improved.
Specifically, the central control module adopts a first control mode to control the operation of the sealing module and the pressurizing module, the opening which is currently opened is set as an ith opening, the pressurizing module pressurizes the pressure in the multi-way reversing valve to be tested to a preset pressure Pi, wherein i=1, 2, …, n and n are the number of the openings corresponding to the multi-way reversing valve to be tested, n is more than or equal to 4 and n is an integer, the central control module judges the total number na of the pressures Pi' measured by any sealing opening in the pressurizing process of the pressure detection module so as to classify the severe density interval of the multi-way reversing valve to be tested,
if na is less than or equal to 1, the central control module judges that the multi-way reversing valve to be tested accords with a first preset strict density;
if na is more than or equal to 2, the central control module judges that the multi-way reversing valve to be detected does not accord with the first preset strict density and according to the variance sigma of each Pi' i 2 Further judging;
the first control mode is to control the sealing module to seal the multi-way reversing valve in a first preset sealing mode and control the pressurizing module to pressurize the multi-way reversing valve from the opened opening;
the first preset tightness is the corresponding tightness between the valve plug and the valve body in the multi-way reversing valve to be tested, which is not leaked.
Specifically, when the pressure at any closed opening is not equal to 0, the pressure can be measured, at the moment, the severe intervals of the multi-way reversing valve to be measured are classified according to the total number na of the measured pressures Pi', the severe oil way density in the multi-way reversing valve is judged by judging the number of the measured pressures, the difficulty in detecting the oil way is effectively reduced, and meanwhile, the fault positioning accuracy of the multi-way reversing valve is further improved.
Specifically, the central control module determines the first determination condition according to the mean square error σ of each Pi' detected by the pressure detection module i 2 Determining the state of a multi-way reversing valve to be tested, wherein a first preset comparison value alpha 1 and a second preset comparison value alpha 2 are arranged in a central control module, wherein 0 is smaller than alpha 1 and smaller than alpha 2, and the central control module uses sigma i 2 In comparison with a 1 and a 2,
if alpha 2 is less than or equal to sigma i 2 The central control module judges that the multi-way reversing valve to be tested is at a second preset tightness;
if alpha 1 is less than or equal to sigma i 2 The central control module judges that the multi-way reversing valve to be tested is in a third preset strict density;
if 0 is less than or equal to sigma i 2 The central control module judges that the multi-way reversing valve to be detected is damaged and judges a damaged part according to the detection result of the laser detection module;
the first judging condition is that the central control module judges that the multi-way reversing valve to be tested does not accord with a first preset strict density;
the second preset tightness is the corresponding tightness of the to-be-tested multi-way reversing valve capable of working normally; the third preset tightness is the corresponding tightness of the opening damage of the multi-way reversing valve to be tested.
By comparing the variances of the pressures at the closed openings, the blocking condition in the multi-way reversing valve is determined, the complexity of detecting the multi-way reversing valve is effectively reduced, and meanwhile, the fault positioning accuracy of the multi-way reversing valve is further improved.
Specifically, the central control module determines the second judgment condition according to the mean square error sigma corresponding to the ith opening i 2 Mean square error sigma corresponding to the (i+1) th opening i+1 2 The difference delta alpha obtained by the difference is judged to determine the damage position of the opening of the multi-way reversing valve to be detected, and delta alpha = sigma is set i 2 -σ i+1 2 A third preset comparison value alpha 3 is arranged in the central control module, wherein, 0 is smaller than alpha 3, the central control module compares delta alpha with alpha 3,
if the alpha 3 is less than or equal to delta alpha and less than or equal to alpha 3, the central control module judges that the combination position of the valve body and the valve plug is damaged, and judges the damaged part according to the detection result of the laser detection module;
if delta alpha is less than-alpha 3, the central control module judges that the ith opening position is damaged;
if alpha 3 is less than delta alpha, the central control module judges that the (i+1) th opening position is damaged;
the second judging condition is that the central control module judges that the multi-way reversing valve to be tested is in a third preset density.
The damage positions of the openings of the multi-way reversing valve are positioned in a mode of respectively detecting the openings of the multi-way reversing valve, so that the difficulty of detecting the tightness of the openings of the multi-way reversing valve is effectively reduced, and the fault positioning accuracy of the multi-way reversing valve is further improved.
Fig. 4 is a test chart of the laser detection module according to the embodiment of the invention.
The laser generating unit emits a first laser beam 5 and a second laser beam 6, which respectively irradiate the corresponding upper tangential direction and lower tangential direction of the valve plug 4, and respectively form a first reflection point 7 and a second reflection point 8 on the laser receiving unit.
Specifically, the detection mode of the laser detection module is as follows:
step S1, removing a valve plug from a multi-way reversing valve to be tested and fixing the valve plug at a set detection position of a laser detection module;
step S2, the laser generating unit takes the central axis of the valve plug as a reference, simultaneously irradiates a beam of parallel laser to the upper tangential direction and the lower tangential direction of the cross section of the valve plug in a preset direction, and corresponds to the jth laser irradiated to the upper tangential direction of the valve plug and the jth laser irradiated to the lower tangential direction of the cross section of the valve plug, and is coplanar in the cross section;
step S3, the laser receiving unit receives the light reflected by the surface of the valve plug by the laser generating unit, and calculates the reflecting point corresponding to the jth laser and the distance Lj of the reflecting point corresponding to the jth laser;
wherein j=1, 2,3, …, m, m is not less than 2 and m is an integer.
Specifically, the central control module determines the smoothness of the valve plug according to the distance Lj measured on the valve plug under the third judging condition, the central control module is provided with a qualified distance Lalpha and a second preset distance Lbeta corresponding to the multi-way reversing valve to be tested, wherein, lalpha is more than 0 and less than Lbeta, the central control module sequentially compares Lj with Lalpha and Lbeta,
If any Lj is less than Lalpha or Lbeta is less than Lj, the central control module judges that the smoothness of the valve plug is in an overrun smoothness interval;
if any Lalpha is less than or equal to Lj and less than or equal to Lbeta, the central control module judges that the smoothness of the valve plug is in a preset allowable smoothness interval;
the third judging 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 finishes the calculation of the distance Lj;
the first preset smoothness interval is a concave part on the valve plug, the preset allowable smoothness interval is a normal valve plug, and the second preset smoothness interval is a convex part on the valve plug.
In particular, the central control module judges the corresponding specific damage position of the multi-way reversing valve to be detected and/or the valve body and the valve plug combination position according to the smoothness of the valve plug,
if the smoothness of the valve plug is in the allowable smoothness interval, the central control module judges that the damaged position of the multi-way reversing valve to be detected is the valve body;
if the smoothness of the valve plug is in a first preset smoothness interval or a second preset smoothness interval, the central control module replaces the valve plug with the valve plug in a preset allowable smoothness interval, and seals the to-be-tested multi-way reversing valve after replacing the valve plug in a first preset sealing mode again, and simultaneously tests each opening to determine the tightness of the to-be-tested multi-way reversing valve.
The appearance smoothness of the valve plug is judged by utilizing the laser to detect the appearance of the valve plug, so that the accuracy of fault positioning of the multi-way reversing valve is further improved when the appearance detection accuracy of the valve plug is effectively improved.
Specifically, the central control module adopts a second control mode to control the sealing module and the pressurizing module to work under the first qualified condition, the pressure detection module detects each opening in a second preset sealing mode to determine the smooth state of the oil path of the multi-way reversing valve to be detected,
if the pressures of the openings detected by the pressure detection module are the same, the central control module judges that the oil way is in a first preset unobstructed state;
if the pressure of each opening detected by the pressure detection module is different, the central control module judges that the oil way is in a second preset unobstructed state;
the second control mode is to sequentially control the multi-way reversing valve to be in a first preset working condition and a second preset working condition, control the sealing module to seal the multi-way reversing valve in the second preset sealing mode under the corresponding working conditions respectively, and control the pressurizing module to pressurize the multi-way reversing valve from the opened opening;
The first preset unobstructed state is a corresponding state of stable operation of the multi-way reversing valve to be detected, and the second preset unobstructed state is a corresponding state of oil channel blockage of the multi-way reversing valve to be detected;
the first qualified condition is a corresponding condition that the multi-way reversing valve to be tested is in a first preset strict density.
The damaged part of the multi-way reversing valve is judged through the smoothness of the valve plug, meanwhile, the part which cannot be judged is further tested by utilizing the qualified part, so that the damaged position of the multi-way reversing valve is accurately positioned, and the fault positioning accuracy of the multi-way reversing valve is further improved while the judging rationality of the damaged position of the multi-way reversing valve is effectively improved.
Specifically, the central control module adopts a second control mode to control the sealing module and the pressurizing module to work, the pressure detection module detects each opening in a second preset sealing mode to determine the smooth state of the oil path of the multi-way reversing valve to be detected,
if the pressures of the openings detected by the pressure detection module are the same, the central control module judges that the oil way is in a first preset unobstructed state;
if the pressure of each opening detected by the pressure detection module is different, the central control module judges that the oil way is in a second preset unobstructed state;
The second control mode is to sequentially control the multi-way reversing valve to be in a first preset working condition and a second preset working condition, control the sealing module to seal the multi-way reversing valve in the second preset sealing mode under the corresponding working conditions respectively, and control the pressurizing module to pressurize the multi-way reversing valve from the opened opening;
the first preset unobstructed state is a corresponding state of stable operation of the multi-way reversing valve to be detected, and the second preset unobstructed state is a corresponding state of oil way blockage of the multi-way reversing valve to be detected.
The oil way is tested in a mode of sealing each opening of the multi-way reversing valve, so that whether the oil way works normally or not is judged, the difficulty in testing the oil way is effectively reduced, and meanwhile, the fault positioning accuracy of the multi-way reversing valve is further improved.
Specifically, the pressure detection module further comprises a plurality of pressure sensors, wherein the pressure sensors respectively correspond to the sealing covers of the sealing module and are arranged at the position with the largest central deformation amount of the sealing covers so as to measure the pressure born by the sealing covers.
The mode of the sealing cover capable of deforming through the arrangement center effectively improves the accuracy of pressure detection and simultaneously further improves the accuracy of fault positioning of the multi-way reversing valve.
By means of the mode that the pressure sensors are arranged on the sealing covers, pressure detection difficulty is effectively reduced, and meanwhile, fault positioning accuracy of the multi-way reversing valve is further improved.
Taking a single to-be-tested multi-way reversing valve as an example, the test flow for multi-way reversing by utilizing the technical scheme of the invention is as follows:
placing the multi-way reversing valve into a test system, and closing all openings of the multi-way reversing valve by a closing module;
the sealing covers are sequentially opened and respectively pressurized, the pressure of the other closed openings is tested, the pressures are compared, and 4 conditions exist:
in the case Si1, if all the other closed openings are not pressurized, the central control module judges that the multi-way reversing valve is tight;
in the case of Si2, if only a single closed opening is pressurized, the central control module judges that the multi-way reversing valve is tight;
if the plurality of closed openings are subjected to different pressures, the central control module judges tightness according to the discrete degree, wherein if the discrete degree is low, the central control module judges that the inside of the multi-way reversing valve leaks, and if the discrete degree is high, the central control module judges that the multi-way reversing valve does not leak;
in the case of Si4, if the plurality of closed openings are subjected to the same pressure, the central control module judges that the inside of the multi-way reversing valve leaks;
After the leakage degree of the multi-way reversing valve is determined, the valve plug of the multi-way reversing valve is taken out to be positioned at the center of the laser receiving unit in order to determine the damage position of the valve body and the valve plug, and meanwhile, the laser generating unit is started;
the laser generating unit emits two laser beams to irradiate the edge of the valve plug at a preset included angle, the cross section of the edge is in the same plane with the connecting line of the central axis of the laser generating unit and the central axis of the valve plug, the two laser beams are reflected to the laser receiving unit by the valve plug to form two light spots, and each light spot comprises a point with highest brightness; and the central control module judges the distance of the highest brightness point, and if the distance of the light spot formed by any pair of lasers on the laser receiving unit exceeds an allowable value in the test process, the smoothness of the valve plug is unqualified.
Wherein, the cross section is perpendicular to the central axis of the valve plug and 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 an intersection line with the outer contour of the valve plug, the intersection line is a circular closed line in an ideal state, and the first laser and the second laser in fig. 4 irradiate the tangential direction of the intersection line, that is, the intersection point of each laser extension line and the intersection line has one and only one.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An intelligent testing system for a multiple directional control valve, comprising:
the sealing module is arranged at each opening on the surface of the valve body of the multi-way reversing valve to be tested, so as to seal each opening in a first preset sealing mode or a second preset sealing mode respectively;
the pressurizing module is connected with the sealing module and the multi-way reversing valve to be tested and is used for pressurizing an oil way in the multi-way reversing valve to be tested through an opened opening under a first preset working condition and a second preset working condition of the multi-way reversing valve to be tested;
The pressure detection module is arranged at each opening of the sealing module and is used for measuring the pressure received by each opening;
the laser detection module comprises a plurality of laser generating units and laser receiving units with the same specification, and is used for carrying out laser irradiation on the valve plug of the multi-way reversing valve to be detected according to a preset direction and receiving reflected laser points;
the central control module is respectively connected with the sealing module, the pressurizing module, the pressure detection module and the laser detection module and used for controlling the sealing module and the pressurizing module to work in a set sequence, analyzing each pressure and each laser point and judging the damage position of the multi-way reversing valve to be tested according to an analysis result;
the first preset sealing mode is to open one of openings to be tested of the multi-way reversing valve to be tested and seal other openings of the multi-way reversing valve to be tested except the opening to be tested, the second preset sealing mode is to seal all openings of the multi-way reversing valve to be tested for connecting output objects and open other openings of the multi-way reversing valve to be tested, the first preset working condition is a corresponding working condition of the valve plug at a first preset position, and the second preset working condition is a corresponding working condition of the valve plug at a second preset position;
The first preset position is a corresponding position of the valve plug when the oil liquid in the multi-way reversing valve to be detected is in a preset forward direction, and the second preset position is a corresponding position of the valve plug when the oil liquid in the multi-way reversing valve to be detected is in a preset reverse direction, and the preset forward direction and the preset reverse direction are related to the working connection mode of the multi-way reversing valve to be detected.
2. The intelligent testing system of the multi-way reversing valve according to claim 1, wherein the sealing module comprises a plurality of sealing covers, and the sealing covers cover all openings on the surface of the valve body of the multi-way reversing valve to be tested in a preset mode;
when the pressurizing module tests the multi-way reversing valve to be tested, gradually increasing the pressure applied to the multi-way reversing valve to be tested at preset time intervals;
when the sealing cover of the sealing module is sealed with the corresponding opening, the edge of the cover body of the sealing cover is rigidly connected with the corresponding opening, and the middle part of the cover body of the sealing cover can bulge upwards or downwards when bearing the preset minimum deformation pressure;
the preset minimum deformation pressure is a value corresponding to the minimum pressure of the pressurizing module.
3. The intelligent testing system of multiple directional control valve according to claim 2, wherein the central control module adopts the first control mode to control the closed module and the pressurizing module to work, the opening which is currently opened is set as the i-th opening, the pressurizing module pressurizes the pressure in the multiple directional control valve to be tested to the preset pressure Pi, wherein i=1, 2, …, n, n is the number of openings corresponding to the multiple directional control valve to be tested, n is greater than or equal to 4 and n is an integer, the central control module determines the total number na of the pressures Pi' measured by any closed opening in the pressurizing process of the pressure detecting module to classify the severe density interval of the multiple directional control valve to be tested,
If na is less than or equal to 1, the central control module judges that the multi-way reversing valve to be tested accords with a first preset tightness;
if na is more than or equal to 2, the central control module judges that the multi-way reversing valve to be tested does not accord with a first preset tightness and according to the variance sigma of each Pi' i 2 Further judging;
the first control mode is to control the sealing module to seal the multi-way reversing valve in the first preset sealing mode and control the pressurizing module to pressurize the multi-way reversing valve from the opened opening;
the first preset tightness is the corresponding tightness between the valve plug and the valve body of the multi-way reversing valve to be tested, wherein the corresponding tightness is not leaked.
4. A multiplexing according to claim 3The intelligent check valve testing system is characterized in that the central control module is used for detecting the mean square error sigma of each Pi' according to the pressure detection module under a first judging condition i 2 Determining the state of a multi-way reversing valve to be tested, wherein a first preset comparison value alpha 1 and a second preset comparison value alpha 2 are arranged in the central control module, wherein 0 is more than alpha 1 and less than alpha 2, and the central control module uses sigma i 2 In comparison with a 1 and a 2,
if alpha 2 is less than or equal to sigma i 2 The central control module judges that the multi-way reversing valve to be tested is in a second preset strict density;
If alpha 1 is less than or equal to sigma i 2 The central control module judges that the multi-way reversing valve to be detected is at a third preset density;
if 0 is less than or equal to sigma i 2 The central control module judges that the multi-way reversing valve to be detected is damaged and judges a damaged part according to the detection result of the laser detection module;
the first judging condition is that the central control module judges that the multi-way reversing valve to be tested does not accord with a first preset tightness;
the second preset tightness is the corresponding tightness of the to-be-tested multi-way reversing valve capable of working normally; and the third preset tightness is the corresponding tightness of the opening damage of the multi-way reversing valve to be tested.
5. The intelligent testing system of multiple directional control valve according to claim 4, wherein the central control module is configured to determine, according to the mean square error σ corresponding to the ith opening, under a second determination condition i 2 Mean square error sigma corresponding to the (i+1) th opening i+1 2 The difference delta alpha obtained by the difference is judged to determine the damage position of the opening of the multi-way reversing valve to be detected, and delta alpha = sigma is set i 2 -σ i+1 2 A third preset comparison value alpha 3 is arranged in the central control module, wherein 0 is smaller than alpha 3, the central control module compares delta alpha with alpha 3,
if the alpha 3 is less than or equal to delta alpha and less than or equal to alpha 3, the central control module judges that the combination position of the valve body and the valve plug is damaged, and judges the damaged part according to the detection result of the laser detection module;
If delta alpha is less than-alpha 3, the central control module judges that the ith opening position is damaged;
if alpha 3 is less than delta alpha, the central control module judges that the (i+1) th opening position is damaged;
and the second judging condition is that the central control module judges that the multi-way reversing valve to be tested is in a third preset density.
6. The intelligent testing system of a multiple directional control valve according to claim 5, wherein the detection mode of the laser detection module is:
step S1, removing a valve plug from the multi-way reversing valve to be detected and fixing the valve plug at a set detection position of the laser detection module;
step S2, the laser generation unit takes the central axis of the valve plug as a reference, simultaneously irradiates a beam of parallel laser to the upper tangential direction and the lower tangential direction of the cross section of the valve plug in a preset direction, and corresponds to the jth laser irradiated to the upper tangential direction of the valve plug and the jth laser irradiated to 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 surface of the valve plug by the laser generating unit, and calculates the distance Lj between the reflecting point corresponding to the jth laser and the reflecting point corresponding to the jth laser;
Wherein j=1, 2,3, …, m, m is not less than 2 and m is an integer.
7. The intelligent testing system of multiple directional control valve according to claim 6, wherein the central control module determines the smoothness of the valve plug according to the distance Lj measured on the valve plug under the third judging condition, the central control module is provided with a qualified distance lα and a second preset distance lβ corresponding to the multiple directional control valve to be tested, wherein 0 < lα < lβ, the central control module sequentially compares Lj with lα and lβ,
if any one of the distances Lj is consistent with Lj < Lα or Lβ < Lj, the central control module judges that the smoothness of the valve plug is in an overrun smoothness interval;
if any one of the distances Lj accords with Lalpha, lj and Lbeta, the central control module judges that the smoothness of the valve plug is in a preset allowable smoothness interval;
the third judging condition is that the central control module judges that the combination position of the valve body and the valve plug is damaged and the laser detection module finishes the calculation of the distance Lj;
the overrun smoothness interval is a valve plug with a concave or convex part, and the preset allowable smoothness interval is a valve plug normal.
8. The intelligent testing system of multiple directional control valve according to claim 7, wherein the central control module determines the corresponding specific damaged position of the multiple directional control valve to be tested according to the smoothness of the valve plug,
If the smoothness of the valve plug is in the allowable smoothness interval, the central control module judges that the damaged position of the multi-way reversing valve to be detected is a valve body;
and if the smoothness of the valve plug is in a first preset smoothness interval or a second preset smoothness interval, the central control module replaces the valve plug with the valve plug in the preset allowable smoothness interval, and seals the to-be-tested multi-way reversing valve after replacing the valve plug in the first preset sealing mode again, and simultaneously tests each opening to determine the tightness of the to-be-tested multi-way reversing valve.
9. The intelligent testing system of the multiple directional control valve according to claim 8, wherein the central control module uses the second control mode to control the sealing module and the pressurizing module to work under the first qualified condition, the pressure detection module detects the openings in the second preset sealing mode to determine the open state of the oil path of the multiple directional control valve to be tested,
if the pressures of the openings detected by the pressure detection module are the same, the central control module judges that the oil way is in a first preset unobstructed state;
if the pressure of each opening detected by the pressure detection module is different, the central control module judges that the oil way is in a second preset unobstructed state;
The second control mode is to sequentially control the multi-way reversing valve to be in the first preset working condition and the second preset working condition, control the sealing module to seal the multi-way reversing valve in the second preset sealing mode under the corresponding working conditions respectively, and control the pressurizing module to pressurize the multi-way reversing valve from the opened opening;
the first preset unobstructed state is a corresponding state of stable operation of the multi-way reversing valve to be detected, and the second preset unobstructed state is a corresponding state of oil channel blockage of the multi-way reversing valve to be detected;
and the first qualified condition is a corresponding condition that the multi-way reversing valve to be tested is in a first preset strict density.
10. The intelligent testing system of a multiple directional control valve according to claim 9, wherein the pressure detecting module further comprises a plurality of pressure sensors, which are respectively corresponding to the sealing covers of the sealing module, and are disposed at the positions of maximum central deformation of the sealing covers, so as to measure the pressure applied to each sealing cover.
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