CN115791149A - Multichannel conversion valve intelligent test system - Google Patents
Multichannel conversion valve intelligent test system Download PDFInfo
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- CN115791149A CN115791149A CN202310047686.9A CN202310047686A CN115791149A CN 115791149 A CN115791149 A CN 115791149A CN 202310047686 A CN202310047686 A CN 202310047686A CN 115791149 A CN115791149 A CN 115791149A
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Abstract
The invention relates to the technical field of hydraulic valves, in particular to an intelligent test system for a multi-way reversing valve, which comprises: the sealing module is used for sealing each opening in a first preset sealing mode or a second preset sealing mode; the pressurization module is used for respectively 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; the pressure detection module is used for measuring the pressure applied to each opening by the sealing module; the laser detection module is used for irradiating the valve plug and receiving the reflected lasers; the central control module is used for analyzing the result and judging the damage position of the multi-way reversing valve; the mode that utilizes to set up above-mentioned each module detects opening tightness, valve body tightness and the case smoothness of multichannel switching-over valve, when effectively having reduced the detection complexity of multichannel switching-over valve, has effectively promoted the degree of accuracy of multichannel switching-over valve fault location.
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
As an important component in a hydraulic system, the multiple directional control valve has the advantages that all components are closely matched, the structure of all components of the valve is very compact, and for the detection of the multiple directional control valve, the actual damaged part of the multiple directional control valve is difficult to determine by adopting a test mode which is mostly adopted at present.
Chinese patent publication no: CN105136442A discloses a delivery test detection method for a hydraulic multi-way directional control valve, which applies a pressure-resistant test pressure to each pressure-bearing oil port by using a pressure-resistant test, and increases the pressure to the pressure-resistant test pressure during the test to maintain the pressure; the oil way type and the sliding valve function, the reversing performance and the internal leakage are measured, the multi-way valve in the slope city in the neutral position 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, namely, when the tested multi-way valve is at a reversing position, regulating the flow of the system to a nominal flow, and measuring the pressure loss of P-A and B-T or P-B and A-T; and (4) the performance of the safety valve is blocked by the AB port of the tested multi-way valve, the multi-way valve is placed at a reversing position, the system pressure is adjusted to be higher than the nominal pressure of the safety valve, and the pressure regulating range, the pressure stability, the pressure swing and the closing characteristic of the safety valve are measured by introducing the nominal flow. Chinese patent publication no: CN109342050A discloses a performance testing system and a testing method for a multi-mode multi-way reversing valve, which are suitable for performance testing of multi-way reversing valves in various testing oil-way modes by using a mode of setting two groups of testing bridges.
Therefore, the technical scheme has the following problems: the actual damage position of the multi-way reversing valve cannot be determined.
Disclosure of Invention
Therefore, the invention provides an intelligent test system for a multi-way reversing valve, which is used for solving the problem that the positioning efficiency of the damaged position of the multi-way reversing valve is low due to the fact that the actual damaged position of the multi-way reversing valve cannot be determined in the prior art.
In order to achieve the above object, the present invention provides an intelligent testing system for a multi-way reversing 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 and is used for sealing each opening in a first preset sealing mode or a second preset sealing mode;
the pressurization module is connected with the sealing module and the to-be-tested multi-way reversing valve and is used for pressurizing an oil path inside the to-be-tested multi-way reversing valve through an opened opening under a first preset working condition and a second preset working condition of the to-be-tested multi-way reversing valve;
the pressure detection module is arranged at each opening of the sealing module and used for measuring the pressure applied to each opening;
the laser detection module comprises a plurality of laser generating units with the same specification and a laser receiving unit, and is used for performing laser irradiation on the valve plug of the multi-way reversing valve to be detected according to a preset direction and receiving each reflected laser spot;
the central control module is respectively connected with the sealing module, the pressurizing module, the pressure detection module and the laser detection module and is 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 to-be-detected multi-way reversing valve according to an 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 to 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, which are used for connecting an output object, and to 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;
wherein, first preset position does the corresponding position of valve plug when fluid is in predetermineeing forward in the multichannel switching valve that awaits measuring, the second preset position does the corresponding position of valve plug when fluid is in predetermineeing reverse in the multichannel switching valve that awaits measuring predetermines forward and predetermine reverse and the job connection mode of the multichannel switching valve that awaits measuring relevant.
Furthermore, the sealing module comprises a plurality of sealing covers, and the sealing covers cover the 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 is used for testing the multi-way reversing valve to be tested, the pressurizing module gradually increases the pressure applied to the interior of 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;
and the preset minimum deformation pressure is a corresponding value of the minimum pressure for pressurizing the pressurizing module.
Further, the central control module controls the sealing module and the pressurizing module to work in a first control mode, the currently opened opening 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, \ 8230, n, n is the number of the openings corresponding to the multi-way reversing valve to be tested, n is more than or equal to 4 and 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 strict 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 meets 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 tested does not accord with the first preset strict density, and the variance sigma of each Pi' is used for judging whether the multi-way reversing valve to be tested does not accord with the first preset strict density i 2 Further judgment is carried out;
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 an opened opening;
the first preset strict density is the corresponding strict density which is not leaked between the valve plug and the valve body of the multi-way reversing valve to be tested.
Further, the central control module determines the mean square error σ of each Pi' detected by the pressure detection module under a first determination condition i 2 Determining the state of the 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, alpha 1 is more than 0 and less than alpha 2, and the central control module enables the sigma to be more than i 2 Compared with the alpha 1 and the alpha 2,
if alpha 2 is not more than 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 not more than sigma i 2 If the density is less than alpha 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 to-be-detected multi-way reversing valve is damaged, and judges a damaged part according to the detection result of the laser detection module;
the first judgment 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 strict density is a corresponding strict density at which the to-be-tested multi-way reversing valve can normally work; and the third preset strict density is the corresponding strict density of the opening damage of the multi-way reversing valve to be detected.
Further, the central control module performs a second judgment according to the mean square error σ corresponding to the ith opening i 2 Mean square error σ corresponding to the i +1 th opening i+1 2 And (4) judging a difference value delta alpha obtained by difference making to determine the damaged position of the opening of the multi-path reversing valve to be detected, and setting delta alpha = sigma i 2 -σ i+1 2 The central control module is provided with a third preset comparison value alpha 3, wherein, alpha 3 is more than 0, the central control module compares delta alpha with alpha 3,
if delta alpha is larger than or equal to-alpha 3 and smaller 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 that a damaged part is damaged 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 judgment condition is that the central control module judges that the multi-way reversing valve to be tested is in a third preset strict density.
Further, the detection mode of the laser detection module is as follows:
s1, taking down a valve plug from the to-be-detected multi-way reversing valve and fixing the valve plug at a set detection position of the laser detection module;
s2, the laser generating unit takes a central axis of the valve plug as a reference, and simultaneously irradiates a beam of parallel laser to the upper tangent direction and the lower tangent direction of the cross section of the valve plug in a preset direction, wherein for the jth laser irradiating the tangential direction of the valve plug, the jth laser irradiating the lower tangent direction of the cross section of the valve plug corresponds to the jth laser irradiating the lower tangent direction of the cross section of the valve plug, and the jth laser irradiating the lower tangent direction of the cross section of the valve plug is coplanar on the cross section;
s3, the laser receiving unit receives the light rays reflected by the surface of the valve plug by the laser generating unit and calculates the distance Lj between the reflection point corresponding to the jth laser and the reflection point corresponding to the jth laser;
wherein j =1,2,3, \8230, m, m ≧ 2 and m is an integer.
Further, the central control module determines the smoothness of the valve plug according to the distance Lj measured by the valve plug under a third judgment condition, the central control module is provided with a qualified distance L α and a second preset distance L β corresponding to the multi-way reversing valve to be measured, wherein L α is greater than 0 and L β is less than 0, the central control module compares Lj with L α and L β in sequence,
if any distance Lj meets the condition that Lj is less than L alpha or L beta is less than Lj, the central control module judges that the smoothness of the valve plug is in an overrun smoothness interval;
if any distance Lj meets the condition that L alpha is not less than Lj and not more than L beta, the central control module judges that the smoothness of the valve plug is in a preset allowable smoothness interval;
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 overrun smoothness interval is that the valve plug is provided with a recess or a protrusion, and the preset allowable smoothness interval is that the valve plug is normal.
Furthermore, 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 within the allowable smoothness range, the central control module judges that the damaged position of the to-be-tested multi-way reversing valve is a 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 the preset smoothness allowing interval, the to-be-tested multi-way reversing valve after the valve plug is replaced is sealed in the first preset sealing mode again, and meanwhile, the openings are tested to determine the tightness of the to-be-tested multi-way reversing valve.
Further, the central control module controls the sealing module and the pressurizing module to work in a second control mode under the first qualified condition, the pressure detection module detects the openings in the second preset sealing mode to determine the unobstructed state of the oil path of the multi-path 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 smooth state;
if the pressures of the openings detected by the pressure detection module are 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, 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 to-be-tested multi-way reversing valve, and the second preset unobstructed state is a corresponding state of blockage of an oil way of the to-be-tested multi-way reversing valve;
the first qualified condition is a corresponding condition that the to-be-tested multi-way reversing valve is in a first preset strict density.
Furthermore, the pressure detection module further comprises a plurality of pressure sensors, which correspond to the sealing covers of the sealing module respectively and are arranged at the positions with the maximum central deformation of the sealing covers so as to measure the pressure applied to the sealing covers.
Compared with the prior art, the method has the advantages that 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 by arranging the sealing module, the pressurizing module, the pressure detection module, the laser detection module and the central control module, so that the detection complexity of the multi-way reversing valve is effectively reduced, and the accuracy of fault positioning of the multi-way reversing valve is effectively improved.
Furthermore, by means of the mode of arranging the sealing covers, the openings of the multiple directional control valves are respectively covered, the oil circuit of the multiple directional control valves is effectively isolated, and meanwhile, the degree of difference of detection of the multiple directional control valves is improved, so that the accuracy of fault location of the multiple directional control valves is further improved.
Furthermore, the strict density of the oil circuit in the multi-way reversing valve is judged in a mode of judging the measured pressure quantity, the difficulty degree of oil circuit detection is effectively reduced, and meanwhile the accuracy of fault positioning of the multi-way reversing valve is further improved.
Furthermore, the blocking condition in the multi-way reversing valve is determined by comparing the variance of the pressure at each closed opening, so that the fault positioning accuracy of the multi-way reversing valve is further improved while the complexity of detecting the multi-way reversing valve is effectively reduced.
Furthermore, the opening damage positions 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 tightness detection of the openings of the multi-way reversing valve is effectively reduced, and the accuracy of fault positioning of the multi-way reversing valve is further improved.
Further, through the mode that utilizes laser to detect the outward appearance that the valve plug detected, judge the outward appearance smoothness of valve plug, when effectively having promoted the valve plug outward appearance detection precision, judge valve plug and valve body leakproofness at the during operation to further promoted multichannel switching valve fault location's the degree of accuracy.
Further, through judging the damaged part of multichannel switching-over valve to the valve plug smoothness, simultaneously, utilize qualified part to carry out further test with the part that can't judge to the damaged position of accurate positioning multichannel switching-over valve, when effectively having promoted the rationality of judging multichannel switching-over valve damaged position, further promoted the degree of accuracy of multichannel switching-over valve fault location.
Furthermore, 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 degree of testing the oil way is effectively reduced, and the accuracy of fault positioning of the multi-way reversing valve is further improved.
Furtherly, can carry out the sealed mode of lid of deformation through setting up the center, when effectively having promoted the accuracy to pressure detection, further promoted multichannel switching-over valve fault location's the degree of accuracy.
Furthermore, by means of the mode that the pressure sensors are arranged on the sealing covers, the pressure detection difficulty is effectively reduced, and meanwhile the accuracy of fault location of the multi-way reversing valve is further improved.
Drawings
FIG. 1 is a schematic connection diagram of an intelligent testing system for a multi-way reversing valve according to the present invention;
FIG. 2 is a schematic diagram of a connection between a test system and a multi-way directional valve to be tested according to an embodiment of the invention;
FIG. 3 is a schematic closed view of a multi-way reversing valve according to an embodiment of the invention;
FIG. 4 is a test chart of a laser detection module according to an embodiment of the present invention;
wherein: 1: a multi-way directional valve; 2: a sealing cover; 3: a pressure sensor; 4: a valve plug; 5: a first laser; 6: a second laser; 7: a first reflection point; 8: a second reflection point.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described in conjunction with the following examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit 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 only for explaining the technical principles of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do 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.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 and fig. 2, a schematic connection diagram of an intelligent test system for a multi-way directional valve according to the present invention and a schematic connection diagram of a test system and a multi-way directional valve to be tested according to an embodiment of the present invention are shown, respectively, where the intelligent test system for a multi-way directional 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 and is used for sealing each opening in a first preset sealing mode or a second preset sealing mode;
the pressurizing module is connected with the sealing module and the to-be-tested multi-way reversing valve and is used for pressurizing an oil path inside the to-be-tested multi-way reversing valve through the opened opening under a first preset working condition and a second preset working condition of the to-be-tested multi-way reversing valve;
the pressure detection module is arranged at each opening of the sealing module and used for measuring the pressure applied to each opening;
the laser detection module comprises a plurality of laser generating units with the same specification and a laser receiving unit, 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 each reflected laser point;
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 detected according to an analysis result;
the method comprises the following steps that a 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, a second preset sealing mode is to seal all openings used for connecting output objects in the multi-way reversing valve to be tested and open other openings of the multi-way reversing valve to be tested, the first preset working condition is a corresponding working condition of a 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 oil in the multi-way reversing valve to be tested is in a preset forward direction, the second preset position is a corresponding position of the valve plug when the oil in the multi-way reversing valve to be tested is in a preset reverse direction, and the preset forward direction and the preset reverse direction are related to a working connection mode of the multi-way reversing valve to be tested;
specifically, the output object is a piston corresponding to an oil path of the multi-path reversing valve, and the piston is arranged behind the multi-path reversing valve and used for providing power for 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 working stroke of the piston.
The mode that utilizes to set up closed module, pressurization module, pressure detection module, laser detection module and well accuse module detects opening tightness, valve body tightness and case smoothness of multichannel switching-over valve, when effectively having reduced the detection complexity of multichannel switching-over valve, has effectively promoted the degree of accuracy of multichannel switching-over valve fault location.
Please refer to fig. 3, which is a schematic closing diagram of a multi-way reversing valve according to an embodiment of the present invention.
The sealing cover 2 seals each opening of the multiple directional control valve 1, and the pressure sensor 3 is provided at the center of the sealing cover 2.
The sealing module comprises a plurality of sealing covers, and the sealing covers cover the 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 is used for testing the multi-way reversing valve to be tested, the pressure applied to the interior of the multi-way reversing valve to be tested is gradually increased 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 minimum pressure corresponding value for pressurizing the pressurizing module.
The mode that utilizes to set up sealed lid covers each opening of multichannel switching-over valve respectively, when effectively having kept apart the multichannel switching-over valve oil circuit, has promoted the difference degree to the multichannel switching-over valve detection to further promoted the degree of accuracy of multichannel switching-over valve fault location.
The mode that sets up pressure sensor on each sealed lid is utilized, when effectively having reduced the pressure detection degree of difficulty, has further promoted multichannel switching-over valve fault location's the degree of accuracy.
Specifically, the central control module controls the closed module and the pressurizing module to work in a first control mode, the currently opened opening is set as the 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, \8230;, 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 is an integer, the central control module judges the total number na of the pressure Pi' measured by any closed opening in the pressurizing process of the pressure detection module so as to classify the strict 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 meets 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 tested does not conform to the first preset strict density, and the variance sigma of each Pi' is used for judging whether the multi-way reversing valve to be tested does not conform to the first preset strict density i 2 Further judgment is carried out;
the first control mode is that the sealing module is controlled to seal the multi-way reversing valve in a first preset sealing mode, and the pressurizing module is controlled to pressurize the multi-way reversing valve from the opened opening;
the first preset strict density is a corresponding strict density which is not leaked between a valve plug and a valve body in the multi-way reversing valve to be tested.
Specifically, when the pressure at any closed opening is not equal to 0, the pressure is recorded as being capable of being measured, the strict density interval of the multi-way reversing valve to be measured is classified according to the total number na of the measured pressures Pi', the strict density of an oil way in the multi-way reversing valve is judged by judging the measured pressure number, the difficulty of detecting the oil way is effectively reduced, and meanwhile, the accuracy of fault location of the multi-way reversing valve is further improved.
Specifically, the central control module determines the mean square error σ of each Pi' according to the pressure detection module under the first determination condition i 2 Determining the state of the 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, alpha 1 is more than 0 and less than alpha 2, and the central control module enables the sigma to be more than i 2 Compared with the alpha 1 and the alpha 2,
if alpha 2 is not more than sigma i 2 Central control module determinationThe multi-way reversing valve to be tested is in a second preset strict density;
if alpha 1 is not more than sigma i 2 If the density is less than alpha 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 If the detection result is less than alpha 1, the central control module judges that the multi-way reversing valve to be detected is damaged, and judges that a damaged part is damaged according to the detection result of the laser detection module;
the first judgment 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 strict density is a corresponding strict density at which the to-be-detected multi-way reversing valve can normally work; and the third preset strict density is the corresponding strict density of the damage of the opening of the multi-way reversing valve to be detected.
The blocking condition in the multi-way reversing valve is determined by comparing the variance of the pressure at each closed opening, so that the complexity of detecting the multi-way reversing valve is effectively reduced, and the accuracy of fault positioning of the multi-way reversing valve is further improved.
Specifically, the central control module corresponds to the mean square error sigma according to the ith opening under the second judgment condition i 2 Mean square error σ corresponding to the i +1 th opening i+1 2 And judging the difference value delta alpha obtained by difference to determine the damage position of the opening of the multi-path reversing valve to be detected, and setting delta alpha = sigma i 2 -σ i+1 2 The central control module is provided with a third preset comparison value alpha 3, wherein, 0 is less than alpha 3, the central control module compares delta alpha with alpha 3,
if delta alpha is larger than or equal to-alpha 3 and smaller 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 that a damaged part is damaged 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 is damaged;
if the alpha 3 is less than the delta alpha, the central control module judges that the (i + 1) th opening position is damaged;
and the second judgment condition is that the central control module judges that the multi-way reversing valve to be tested is in a third preset strict density.
Through the mode of detecting each opening of multichannel switching-over valve respectively, damage the position to the opening of multichannel switching-over valve and fix a position, when effectively having reduced because of the degree of difficulty that the tightness of multichannel switching-over valve opening detected, further promoted the degree of accuracy of multichannel switching-over valve fault location.
Please refer to fig. 4, which is a test chart of a laser detection module according to an embodiment of the present invention.
The laser generating unit emits a first laser 5 and a second laser 6, which are respectively irradiated on the corresponding upper tangent and lower tangent 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:
s1, taking down a valve plug from a multi-way reversing valve to be detected and fixing the valve plug at a set detection position of a laser detection module;
s2, the laser generating unit takes the central axis of the valve plug as a reference, and simultaneously irradiates a beam of parallel laser to the upper tangent and the lower tangent of the cross section of the valve plug in a preset direction, wherein for the jth laser irradiating the upper tangent of the valve plug, the jth laser irradiating the lower tangent of the cross section of the valve plug corresponds to the jth laser irradiating the lower tangent of the cross section of the valve plug, and the jth laser is coplanar on the cross section;
s3, the laser receiving unit receives the light rays reflected by the surface of the valve plug from the laser generating unit and calculates the distance Lj between the reflection point corresponding to the jth laser and the reflection point corresponding to the jth laser;
wherein j =1,2,3, \8230, m, m ≧ 2 and m is an integer.
Specifically, the central control module determines the smoothness of the valve plug according to the distance Lj measured by the valve plug under the third judgment condition, the central control module is provided with a qualified distance L alpha and a second preset distance L beta corresponding to the multi-way reversing valve to be measured, wherein L alpha is greater than 0 and less than L beta, the central control module compares Lj with L alpha and L beta in sequence,
if any Lj is less than L alpha or L beta is less than Lj, the central control module judges that the smoothness of the valve plug is in the out-of-limit smoothness range;
if any L alpha is less than or equal to Lj and less than or equal to L beta, the central control module judges that the smoothness of the valve plug is within a preset allowable smoothness range;
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 smoothness interval of predetermineeing exists sunkenly for on the valve plug, predetermines and allows the smoothness interval for the valve plug normal, and the second predetermines the smoothness interval and exists protrudingly for on the valve plug.
Specifically, the central control module determines the corresponding specific damage position of the damage of the multi-way reversing valve to be detected and/or the damage of the combination position of the valve body and the valve plug 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 judges that the damaged position of the multi-way reversing valve to be detected is a 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 the valve plug in the preset smoothness allowing interval, the to-be-tested multi-way reversing valve after the valve plug is replaced is sealed in the first preset sealing mode again, and meanwhile, each opening is tested to determine the tightness of the to-be-tested multi-way reversing valve.
Through the mode that utilizes laser to carry out the detection to the outward appearance that the valve plug detected, judge the outward appearance smoothness of valve plug, when effectively having promoted the valve plug outward appearance and detecting the precision, judge valve plug and valve body in the tightness of during operation to the degree of accuracy of multichannel switching valve fault location has further been promoted.
Specifically, the central control module controls the sealing module and the pressurizing module to work in a second control mode under the first qualified condition, the pressure detection module detects each opening in a second preset sealing mode to determine the smooth state of an oil path of the multi-path 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 smooth state;
if the pressures of the openings detected by the pressure detection module are different, the central control module judges that the oil way is in a second preset smooth state;
the second control mode is that the multi-way reversing valve is controlled to be in a first preset working condition and a second preset working condition in sequence, the sealing module is controlled to seal the multi-way reversing valve in a second preset sealing mode under the corresponding working conditions respectively, and the pressurizing module is controlled to pressurize the multi-way reversing valve from the opened opening;
the first preset unobstructed state is a corresponding state that the operation of the multi-way reversing valve to be tested is stable, and the second preset unobstructed state is a corresponding state that an oil way 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 strict density.
Through judging the damaged part of multichannel switching-over valve to the valve plug smoothness, simultaneously, utilize qualified part to further test the part that can't judge to the damaged position of accurate positioning multichannel switching-over valve when effectively having promoted the rationality of judging multichannel switching-over valve damaged position, further promoted the degree of accuracy of multichannel switching-over valve fault location.
Specifically, the central control module controls the sealing module and the pressurizing module to work in a second control mode, the pressure detection module detects each opening in a second preset sealing mode to determine the unobstructed state of an oil path of the multi-path 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 smooth state;
if the pressures of the openings detected by the pressure detection module are different, the central control module judges that the oil way is in a second preset smooth state;
the second control mode is that the multi-way reversing valve is controlled to be in a first preset working condition and a second preset working condition in sequence, the sealing module is controlled to seal the multi-way reversing valve in a second preset sealing mode under the corresponding working conditions respectively, and the pressurizing module is controlled to pressurize the multi-way reversing valve from the opened opening;
the first preset smooth state is a corresponding state that the to-be-detected multi-way reversing valve runs stably, and the second preset smooth state is a corresponding state that an oil way of the to-be-detected multi-way reversing valve is blocked.
The oil way is tested in a mode of sealing the openings of the multi-way reversing valve, so that whether the oil way works normally or not is judged, the difficulty degree of testing the oil way is effectively reduced, and the accuracy of fault positioning 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 positions where the central deformation of the sealing covers is maximum so as to measure the pressure applied to the sealing covers.
Through setting up the mode that the sealed lid that the center can carry out deformation, when effectively having promoted the accuracy to pressure measurement, further promoted multichannel switching-over valve fault location's the degree of accuracy.
The mode that sets up pressure sensor on each sealed lid is utilized, when effectively having reduced the pressure detection degree of difficulty, has further promoted multichannel switching-over valve fault location's the degree of accuracy.
Taking a single to-be-tested multi-way reversing valve as an example, the testing process for carrying out multi-way reversing by using the technical scheme of the invention is as follows:
placing the multi-way reversing valve into a test system, and simultaneously sealing all openings of the multi-way reversing valve by a sealing module;
the sealing caps were opened in sequence and pressurized separately, the pressure of the remaining closed openings was tested and compared, and there were 4 cases:
under the condition of Si1, if the other closed openings are not subjected to pressure, the central control module judges that the multi-way reversing valve is tight;
in case Si2, if only a single closed opening is subjected to pressure, the central control module judges that the multi-way reversing valve is tight;
in case Si3, if the plurality of closed openings are subjected to different pressures, the central control module judges the tightness according to the discrete degree of the plurality of closed openings, wherein if the discrete degree is low, the central control module judges that the interior 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 case 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, in order to determine the damaged parts of the valve body and the valve plug, the valve plug of the multi-way reversing valve is taken out and placed in the center of the laser receiving unit, and meanwhile, the laser generating unit is started;
the laser generating unit emits two beams of laser to irradiate towards the edge of the valve plug at a preset included angle, the section of the edge and a connecting line of the laser generating unit and the central axis of the valve plug are positioned on the same plane, the two beams of laser are reflected to the laser receiving unit by the valve plug to form two light spots, and each light spot comprises a point with the highest brightness; and the central control module judges the distance of the highest brightness point, and if the distance of the light spots formed by any pair of lasers in the laser receiving unit exceeds an allowable value in the test process, the smoothness of the valve plug is unqualified.
The cross section is perpendicular to the central axis of the valve plug and is located on the perpendicular line of the laser emitting unit and the central axis of the valve plug, for a single cross section, a boundary line exists between the single cross section and the outer contour of the valve plug, the boundary line is a circular closed line in an ideal state, the first laser and the second laser in fig. 4 are irradiated to the tangential direction of the boundary line, namely, the intersection points of the extension lines of the lasers and the boundary line are respectively provided with one and only one intersection point.
So far, the technical solutions of the present invention have 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 the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a multichannel switching-over valve intelligent test system which characterized in that 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 pressurization module is connected with the sealing module and the to-be-tested multi-way reversing valve and is used for pressurizing an oil path inside the to-be-tested multi-way reversing valve through an opened opening under a first preset working condition and a second preset working condition of the to-be-tested multi-way reversing valve;
the pressure detection module is arranged at each opening of the sealing module and used for measuring the pressure applied to each opening;
the laser detection module comprises a plurality of laser generating units with the same specification and a laser receiving unit, and is used for performing laser irradiation on the valve plug of the multi-way reversing valve to be detected according to a preset direction and receiving each reflected laser spot;
the central control module is respectively connected with the sealing module, the pressurizing module, the pressure detection module and the laser detection module and is 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 to-be-detected multi-way reversing valve according to an 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 to 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, which are used for connecting an output object, and to 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;
wherein, first preset position does the corresponding position of valve plug when fluid is in predetermineeing forward in the multichannel switching valve that awaits measuring, the second preset position does the corresponding position of valve plug when fluid is in predetermineeing reverse in the multichannel switching valve that awaits measuring predetermines forward and predetermine reverse and the job connection mode of the multichannel switching valve that awaits measuring relevant.
2. The intelligent test system for the multi-way reversing valve according to claim 1, wherein the sealing module comprises a plurality of sealing covers, and the sealing covers are covered at each opening on the surface of the valve body of the multi-way reversing valve to be tested in a preset mode;
when the pressurizing module is used for testing the multi-way reversing valve to be tested, the pressure applied to the interior of the multi-way reversing valve to be tested is gradually increased at preset time intervals;
when the sealing covers of the sealing modules are sealed with the corresponding openings, the edges of the cover bodies of the sealing covers are rigidly connected with the corresponding openings, and the middle parts of the cover bodies of the sealing covers can bulge upwards or downwards when bearing preset minimum deformation pressure;
and presetting the minimum deformation pressure as a corresponding value of the minimum pressure for pressurizing the pressurizing module.
3. The intelligent testing system of the multi-way reversing valve according to claim 2, wherein the central control module controls the operation of the sealing module and the pressurizing module in a first control manner, sets the currently opened opening 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, \8230, n, n is the number of openings corresponding to the multi-way reversing valve to be tested, n is not less than 4 and is an integer, the central control module determines the total number na of the pressures Pi' measured by any sealed opening of the pressure detection module during pressurization so as to classify the strict 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 meets 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 tested does not accord with the first preset strict density, and the variance sigma of each Pi' is used for judging whether the multi-way reversing valve to be tested does not accord with the first preset strict density i 2 Further judgment is carried out;
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 an opened opening;
the first preset strict density is the corresponding strict density which is not leaked between the valve plug and the valve body of the multi-way reversing valve to be tested.
4. The intelligent testing system of claim 3, wherein 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 the 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, alpha 1 is more than 0 and less than alpha 2, and the central control module compares the alpha with the alpha 2 i 2 Compared with the alpha 1 and the alpha 2,
if alpha 2 is not more than 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 not more than sigma i 2 If the measured value is less than alpha 2, the central control module judges that the multi-way reversing valve to be measured is in a third preset strict density;
if 0 is less than or equal to sigma i 2 If the detected signal is less than alpha 1, 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 judgment 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 strict density is a corresponding strict density at which the to-be-tested multi-way reversing valve can normally work; and the third preset strict density is the corresponding strict density of the damaged opening of the to-be-detected multi-way reversing valve.
5. The intelligent test system for the multiway reversing valve according to claim 4, wherein the central control module is used for judging the mean square error (σ) corresponding to the ith opening under the second judgment condition i 2 Mean square error σ corresponding to the i +1 th opening i+1 2 Make a differenceAnd judging the obtained difference value delta alpha to determine the damage position of the opening of the multi-path reversing valve to be detected, and setting delta alpha = sigma i 2 -σ i+1 2 The central control module is provided with a third preset comparison value alpha 3, wherein, 0 is more than alpha 3, the central control module compares delta alpha with alpha 3,
if the-alpha 3 is not less than the delta alpha and not more than the alpha 3, the central control module judges that the joint position of the valve body and the valve plug is damaged, and judges that a damaged part is damaged 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 judgment condition is that the central control module judges that the multi-way reversing valve to be tested is in a third preset strict density.
6. The intelligent test system for the multiway reversing valve according to claim 5, wherein the detection mode of the laser detection module is as follows:
s1, taking down a valve plug from the to-be-detected multi-way reversing valve and fixing the valve plug at a set detection position of the laser detection module;
s2, the laser generating unit takes a central axis of the valve plug as a reference, and simultaneously irradiates a beam of parallel laser to the upper tangent direction and the lower tangent direction of the cross section of the valve plug in a preset direction, wherein for the jth laser irradiating the tangential direction of the valve plug, the jth laser irradiating the lower tangent direction of the cross section of the valve plug corresponds to the jth laser irradiating the lower tangent direction of the cross section of the valve plug, and the jth laser irradiating the lower tangent direction of the cross section of the valve plug is coplanar on the cross section;
s3, the laser receiving unit receives the light rays reflected by the surface of the valve plug by the laser generating unit and calculates the distance Lj between the reflection point corresponding to the jth laser and the reflection point corresponding to the jth laser;
wherein j =1,2,3, \8230, m, m ≧ 2 and m is an integer.
7. The intelligent testing system of claim 6, wherein the central control module determines the smoothness of the valve plug according to the distance Lj measured by the valve plug under a third determination condition, the central control module is provided with a qualified distance L α and a second preset distance L β corresponding to the multi-way reversing valve to be tested, wherein L α is greater than 0 and less than L β, the central control module compares Lj with L α and L β in sequence,
if any distance Lj meets the condition that Lj is less than L alpha or L beta is less than Lj, the central control module judges that the smoothness of the valve plug is in an overrun smoothness interval;
if any distance Lj meets the condition that Lalpha is not less than Lj not more than Lbeta, the central control module judges that the smoothness of the valve plug is within a preset allowable smoothness interval;
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 overrun smoothness interval is that the valve plug is provided with a recess or a protrusion, and the preset allowable smoothness interval is that the valve plug is normal.
8. The intelligent testing system of the multiple directional control valve according to claim 7, wherein the central control module determines a corresponding specific damaged position of the multiple directional control valve to be tested according to smoothness of the valve plug,
if the smoothness of the valve plug is within the allowable smoothness range, the central control module judges that the damaged position of the to-be-tested multi-way reversing valve is a 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 the preset smoothness allowing interval, the to-be-tested multi-way reversing valve after the valve plug is replaced is sealed in the first preset sealing mode again, and meanwhile, the openings are tested to determine the tightness of the to-be-tested multi-way reversing valve.
9. The intelligent test system for the multi-way reversing valve according to claim 8, wherein the central control module controls the sealing module and the pressurizing module to work in a second control mode under a first qualified condition, the pressure detection module detects each opening in the second preset sealing mode to determine the unobstructed state of an oil path 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 judges that the oil way is in a first preset smooth state;
if the pressures of the openings detected by the pressure detection module are different, the central control module judges that the oil way is in a second preset smooth 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, 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 to-be-tested multi-way reversing valve, and the second preset unobstructed state is a corresponding state of blockage of an oil way of the to-be-tested multi-way reversing valve;
the first qualified condition is a corresponding condition that the to-be-tested multi-way reversing valve is in a first preset strict density.
10. The intelligent testing system for the multiway reversing valve according to claim 9, wherein the pressure detection module further comprises a plurality of pressure sensors, each of the pressure sensors corresponds to each of the sealing covers of the sealing module, and the pressure sensors are arranged at positions where the central deformation of the sealing covers is the largest so as to measure the pressure applied to each of the sealing covers.
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