CN117704983B - Valve detection method - Google Patents
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Abstract
A valve detection method relates to the technical field of measurement, and comprises the following specific steps: the first step, determining hardware and signal basis; a second step of detecting association transfer of the object; third, compressing and detecting return; the measurement of the hinge clearance of the plurality of connecting rod combinations or the measurement of the hinge clearance and the meshing clearance of the plurality of connecting rods and the gear combination is changed into the measurement of the compression piston stroke and the return piston stroke of the piston, so that the measurement process is simplified, the measurement error is reduced, and the measurement accuracy is improved.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a valve detection method.
Background
The high-pressure valve or the refrigeration valve is used for an aircraft air source system, the safety and the stability are very important, the valve plate is controlled to be opened and closed by adopting the round trip of the piston, and a connecting rod combination is adopted between the piston and the valve plate; the connecting rod and the gear are combined between the piston and the valve plate, the hinge gap of the connecting rod and the meshing gap of the gear are detected, the detection difficulty is higher, the detection is complex, and the detection precision is low.
Disclosure of Invention
Aiming at least one of the problems is solved, and the invention aims to provide a valve detection method by converting the measurement of the hinge clearance of a plurality of connecting rod combinations or the measurement of the hinge clearance and the meshing clearance of a plurality of connecting rod and gear combinations into the measurement of the compression piston stroke and the return piston stroke of a piston, simplifying the measurement process, reducing the measurement error and improving the measurement accuracy.
The technical solution for realizing the purpose of the invention is as follows:
a valve detection method comprises the following specific steps:
the first step, determining hardware and a signal basis, measuring the displacement of a piston at a control end by using a laser ranging sensor, and measuring the rotation angle of a valve plate by using a rotary displacement sensor; the laser ranging sensor and the rotary displacement sensor are based on the same clock signal;
the second step, detecting the associated transfer of the object, wherein the pneumatic control end of the valve adopts a gas compression piston and a spring return piston, and an air flow channel controlled by the valve plate is not connected with an air flow pipeline for measurement; the method comprises the steps of detecting the displacement of a piston, and measuring the hinge gaps of a plurality of connecting rod combinations or the hinge gaps and the meshing gaps of a plurality of connecting rod and gear combinations;
Third step, compression and return detection:
The valve plate is opened, a compression piston state is entered, rotation of the valve plate is determined, the valve plate opening is in a larger state, the compression piston is stopped, the valve plate stops rotating, a compression first displacement amount of the piston at an opening stopping point is determined, then the piston enters a return state, a critical point of the valve plate in a closing state is determined, a return first displacement amount of the piston is determined, a difference value between the compression first displacement amount and the return first displacement amount is a gap displacement amount at the opening stopping point;
Traversing each displacement point of the compression stroke of the piston to obtain the gap displacement of each starting and stopping point;
The valve plate is closed, a return piston state is entered, the valve plate is determined to rotate, the valve plate opening is in a reduced state, the return piston is stopped, the valve plate stops rotating, the piston return second displacement of a closing stopping point is determined, then the piston enters a compression state, the valve plate is determined to be in a critical point of an opening state, the piston compression second displacement is determined, the difference value between the compression second displacement and the return second displacement is the gap displacement of the closing stopping point;
and traversing each displacement point of the return stroke of the piston to obtain the clearance displacement of each closing stopping point.
Compared with the prior art, the invention has the beneficial effects that:
(1) The synchronous measurement of the displacement measured by the laser ranging sensor and the rotation angle measured by the rotary displacement sensor has the following effects: the accuracy is improved, and the displacement and the rotation angle are mutually related data, so that the data with higher accuracy can be obtained by synchronously measuring the displacement and the rotation angle; the real-time performance is enhanced, and the synchronous measurement of the displacement and the rotation angle can acquire the position and posture information of the piston and the valve plate in real time; the data consistency, the synchronous measurement of the displacement and the rotation angle can ensure the measured data consistency;
(2) The hinge clearance measurement of a plurality of connecting rod combinations or the hinge clearance and the meshing clearance measurement of a plurality of connecting rods and gear combinations are converted into measurement of the compression piston stroke and the return piston stroke of the piston, so that the measurement process is simplified: the hinge gap of the connecting rod combination or the hinge gap and the meshing gap of the connecting rod and the gear combination need to be measured and adjusted, and the stroke measurement of the piston only needs to be measured, so that the measurement process is simpler; and (3) reducing measurement errors: the hinge clearance measurement of the connecting rod combination or the hinge clearance and the meshing clearance measurement of the connecting rod and the gear combination are easily affected by each component, the error is large, the stroke measurement of the piston only needs to be performed on the piston, the error source is reduced, and the measurement accuracy is improved; the reliability of the mechanical system is improved: by measuring the stroke of the piston, the abnormal movement condition of the piston can be found in time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a refrigeration valve in semi-section of a valve detection method;
FIG. 2 is a schematic view of a connecting rod hinged force applying rod and a force receiving rod in a valve detection method;
FIG. 3 is a schematic diagram showing the contact between the force applying rod and the left side of the force receiving rod in the connecting rod hinge in the valve detecting method;
FIG. 4 is a schematic view showing the contact between the force applying rod and the right side of the force receiving rod in the connecting rod hinge in the valve detecting method;
FIG. 5 is a gear mesh contactless schematic diagram of a method of detecting a shutter;
FIG. 6 is a schematic diagram of the left contact of the gear engagement of a method of detecting a shutter;
FIG. 7 is a schematic view of the right contact of the gear engagement of a method of detecting a shutter;
FIG. 8 is a schematic diagram of a piston stroke of a method of detecting a shutter;
FIG. 9 is a schematic diagram of the piston stroke determining the opening stop point clearance for a shutter detection method;
FIG. 10 is a schematic diagram of the stroke of a piston of a shutter detection method to determine the closing stop point clearance;
Wherein:
101-a refrigeration valve, 102-a control end air inlet, 103-a piston air pressure end top surface, 104-a pressure relief channel, 105-a valve plate, 201-a first connecting rod, 202-a second connecting rod, 301-a first hinge gap, 302-a second hinge gap, 303-a third hinge gap, 401-a first gear, 402-a second gear, 501-a first meshing gap, 502-a second meshing gap, 503-a third meshing gap, and 601-a piston.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention.
Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of some embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, under the condition of no conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The present invention will be described in further detail with reference to examples.
Embodiment 1, as shown in fig. 1 to 10, the present invention provides a method for detecting a valve, which is implemented by the following specific steps:
the first step, determining hardware and a signal basis, measuring the displacement of a piston at a control end by using a laser ranging sensor, and measuring the rotation angle of a valve plate by using a rotary displacement sensor; the laser ranging sensor and the rotary displacement sensor are based on the same clock signal;
the second step, detecting the associated transfer of the object, wherein the pneumatic control end of the valve adopts a gas compression piston and a spring return piston, and an air flow channel controlled by the valve plate is not connected with an air flow pipeline for measurement; the method comprises the steps of detecting the displacement of a piston, and measuring the hinge gaps of a plurality of connecting rod combinations or the hinge gaps and the meshing gaps of a plurality of connecting rod and gear combinations;
Third step, compression and return detection:
The valve plate is opened, a compression piston state is entered, rotation of the valve plate is determined, the valve plate opening is in a larger state, the compression piston is stopped, the valve plate stops rotating, a compression first displacement amount of the piston at an opening stopping point is determined, then the piston enters a return state, a critical point of the valve plate in a closing state is determined, a return first displacement amount of the piston is determined, a difference value between the compression first displacement amount and the return first displacement amount is a gap displacement amount at the opening stopping point;
Traversing each displacement point of the compression stroke of the piston to obtain the gap displacement of each starting and stopping point;
The valve plate is closed, a return piston state is entered, the valve plate is determined to rotate, the valve plate opening is in a reduced state, the return piston is stopped, the valve plate stops rotating, the piston return second displacement of a closing stopping point is determined, then the piston enters a compression state, the valve plate is determined to be in a critical point of an opening state, the piston compression second displacement is determined, the difference value between the compression second displacement and the return second displacement is the gap displacement of the closing stopping point;
and traversing each displacement point of the return stroke of the piston to obtain the clearance displacement of each closing stopping point.
Measuring the displacement of a piston at a control end by using a laser ranging sensor, and measuring the rotation angle of a valve plate by using a rotary displacement sensor; the laser ranging sensor and the rotary displacement sensor are based on the same clock signal; it should be noted that, by adopting the refrigeration valve 101 to perform the example explanation, the high-pressure level valve is based on the same principle, and in combination with fig. 1, the piston air pressure end top surface 103 of the refrigeration valve 101 measures the displacement by using a laser ranging sensor, the laser ranging sensor adopts a micro structure, the micro laser ranging sensor is put in from the pressure release channel 104, and the pressure release function of the pressure release channel 104 is not affected, the structural characteristics of the micro laser ranging sensor can include the following aspects, and the small size: the micro laser ranging sensor has smaller volume, usually a size of several millimeters to several centimeters, compared with the traditional laser ranging sensor; and (3) light weight: the miniature laser ranging sensor has light weight; integration: the miniature laser ranging sensor generally adopts an integrated design, and components such as a laser transmitter, a receiver, an optical element, a signal processing circuit and the like are integrated together so as to reduce the volume and simplify the structure; low power consumption: the miniature laser ranging sensor is generally characterized by low power consumption; high precision: although small in size, the miniature laser ranging sensor can still provide a high-precision ranging result, and can generally achieve a measuring precision of a sub-millimeter level; fast response: the micro laser ranging sensor has a fast measurement response time and can complete ranging operation in millisecond level. The laser ranging sensor calculates the distance between the top surface of the piston air pressure end and the sensor by emitting a laser beam and measuring the round trip time of the laser beam from the sensor to the top surface of the piston air pressure end, and then calculates the displacement of the top surface of the piston air pressure end. The specific working principle is that the laser ranging sensor emits laser pulses, and when the laser beam intersects with the top surface of the piston air pressure end, part of the laser is reflected back to the sensor by the top surface of the piston air pressure end. A rotary displacement sensor is provided on the valve plate 105, and the rotation angle of the valve plate is measured using the rotary displacement sensor. The rotary displacement sensor can measure the displacement of an object rotating around an axis, and comprises a rotary transformer, a photoelectric encoder and a Hall sensor.
Further, in the first step, the specific method for synchronously measuring the displacement measured by the laser ranging sensor and the rotation angle measured by the rotary displacement sensor is as follows:
step S1, determining a measurement starting point: firstly, determining measurement starting points of a laser ranging sensor and a rotary displacement sensor; for example, when the piston is not compressed, the displacement of the piston is zero as measured by the laser ranging sensor, the valve plate is in a closed state, and the rotation angle measured by the rotary displacement sensor is zero; the compressed value of the piston reaches the maximum value, the laser ranging sensor detects that the displacement of the piston is the maximum value, the valve plate is in an open state, the gas flow of the pipeline controlled by the valve plate reaches the maximum value, the rotation angle detected by the rotary displacement sensor is the maximum value, and conventionally, the angle maximum value can be 90 degrees;
Step S2, synchronizing time: ensuring that the measurement times of the laser ranging sensor and the rotary displacement sensor are synchronized; an external clock or synchronization signal may be used to keep the measurement times of the two sensors consistent;
Step S3, aligning data: aligning measurement data of the laser ranging sensor and the rotary displacement sensor; this can be achieved by matching the measurement data of the two sensors in time sequence, ensuring that the measurement data at each time point is in one-to-one correspondence;
Step S4, data processing: processing the measurement data of the laser ranging sensor and the rotary displacement sensor to obtain displacement and rotation angle;
Step S5, synchronous calibration: due to errors and uncertainties of the sensors, there may be some measurement error; therefore, synchronous calibration is required to improve measurement accuracy. Error correction or data filtering can be performed to reduce errors by comparing measurement results of the laser ranging sensor and the rotary displacement sensor; the synchronous measurement of the displacement measured by the laser ranging sensor and the rotation angle measured by the rotary displacement sensor has the following effects: the accuracy is improved, and the displacement and the rotation angle are mutually related data, so that the data with higher accuracy can be obtained by synchronously measuring the displacement and the rotation angle; the real-time performance is enhanced, and the synchronous measurement of the displacement and the rotation angle can acquire the position and posture information of the piston and the valve plate in real time; the data consistency, the synchronous measurement of the displacement and the rotation angle can ensure the measured data consistency.
Further, in the second step, the pneumatic control end of the valve adopts a gas compression piston and a spring return piston, the reciprocating motion of the piston controls the opening and closing of the valve plate, the piston transmits motion to the valve plate, a connecting rod mode is adopted, or a connecting rod and gear combination mode is adopted, due to the fact that a hinge gap exists between the connecting rod and the gear, a meshing gap exists between the connecting rod and the gear, the piston receives gas pressure, a section of invalid displacement exists in the stroke of the compression piston, that is, the section of displacement cannot exert a mechanical effect on the opening of the valve plate, the gas pressure is reduced, the elastic force of the spring is larger than the gas pressure, the piston is pushed to return by the elastic force, that is, a section of invalid displacement exists in the stroke of the spring return piston, that is, the section of displacement cannot exert a mechanical effect on the closing of the valve plate, and meanwhile, the gas flow channel controlled by the valve plate is not connected with a gas flow pipeline for measurement; it should be noted that, referring to fig. 2 to fig. 4, the first connecting rod 201 and the second connecting rod 202 adopt a hinged manner, when the first connecting rod 201 and the second connecting rod 202 are in the state of the first hinge gap 301, the first connecting rod 201 does not drive the second connecting rod 202 to rotate, the second connecting rod 202 does not drive the first connecting rod 201 to rotate, the first connecting rod 201 and the second connecting rod 202 adopt a circular structure on the force application and stress surface, or a non-circular structure, for example, the circular structure can be adopted here, the force application and stress surface of the second connecting rod 202 and the first connecting rod 201 can be in contact with any angle, for example, the left contact and the right contact are adopted here, and the first connecting rod 201 and the second connecting rod 202 are in contact with each other on the left side to form the second hinge gap 302, at this time, the first connecting rod 201 drives the second connecting rod 202, or the second connecting rod 202 drives the first connecting rod 201; the first connecting rod 201 and the second connecting rod 202 are contacted on the right to form a third hinge gap 303, and at this time, the first connecting rod 201 drives the second connecting rod 202, or the second connecting rod 202 drives the first connecting rod 201; referring to fig. 5 to fig. 7, in a gear engagement manner, when the first gear 401 and the second gear 402 are in a first engagement gap 501 state, the first gear 401 does not drive the second gear 402 to rotate, the second gear 402 does not drive the first gear 401 to rotate, the azimuth relationship between the first gear 401 and the second gear 402 can be changed, the basic principle is the same, and in order to conveniently express the position relationship, the first gear 401 and the second gear 402 are in contact with each other on the left side, for example, to form a second engagement gap 502, and at this time, the first gear 401 drives the second gear 402, or the second gear 402 drives the first gear 401; the first gear 401 and the second gear 402 contact at the right to form a third meshing gap 503, where the first gear 401 drives the second gear 402, or the second gear 402 drives the first gear 401. The plurality of connecting rods are combined to form a plurality of hinging relations, the basic hinging clearance is a hinging relation formed by the first connecting rod 201 and the second connecting rod 202, and then a superposition relation is formed, for example, 5 or 6 connecting rods are hinged; or a combination of links and gears, based on the articulation of the first link 201 and the second link 202, the meshing of the first gear 401 and the second gear 402, such as a combination of 3 links and 4 gears, or a combination of 5 links and 2 gears.
Further, in the second step, when the compression stroke and the return stroke of the gas compression piston and the spring return piston are alternated, the piston and the valve plate are driven by a plurality of connecting rods or driven by a plurality of connecting rods and gear combinations, a hinge gap exists at the hinge position of the two connecting rods, a meshing gap exists at the meshing position of the two gears, no matter the hinge gap or the meshing gap, a driving and driven relationship exists, the hinge of the plurality of connecting rod combinations is like 5 or 6 connecting rod combinations, and a plurality of gears are meshed like 1 or 2 gears are meshed; the first link 201 and the second link 202 are contacted from left to right or from right to left, and the gap displacement amount in this process is S; the first gear 401 and the second gear 402, from left contact to right contact, or from right contact to left contact, the gap displacement amount in this process is S, where the gap displacement amount is S (the gap displacement amount adopts the same symbol, the size can be changed), for illustrating the principle, taking the first link 201 as the driving force applying side and the second link 202 driven force applying side as an example, taking the first gear 401 as the driving force applying side and the second gear 402 driven force applying side as an example, setting the speed of the second link 202 and the second gear 402 to zero, the force F of the first link 201 and the first gear 401 is provided by the piston, according to newton' S second law f=ma, where F represents the force, m represents the mass of the first link 201 and the moving part, or represents the mass of the first gear 401 and the moving part, and a represents the acceleration; according to the kinematic formula v=at, where v represents the final speed and t represents time; at 2 according to the kinematic formula s= (1/2), where S represents the gap displacement amount,/represents division; according to the formula of momentum: p=mv, p represents momentum; from the above-described manner, the larger the gap displacement amount S, the larger the momentum of the first link 201 striking the second link 202, and the larger the probability of deformation at the hinge of the first link 201 and the second link 202; the greater the momentum of the first gear 401 striking the second gear 402, the greater the probability of the first gear 401 striking the second gear 402 to deform at the engagement; the same holds true for the first link 201 and the second link 202 to exchange driving force and driven force; the same holds true for the first gear 401 and the second gear 402 to exchange driving force and driven force; the method has the advantages that the measurement of the hinge clearance of the plurality of connecting rod combinations or the measurement of the hinge clearance and the meshing clearance of the plurality of connecting rods and the gear combinations is changed into the measurement of the compression piston stroke and the return piston stroke of the piston, and the method has the following advantages that the measurement process is simplified: the hinge gap of the connecting rod combination or the hinge gap and the meshing gap of the connecting rod and the gear combination need to be measured and adjusted, and the stroke measurement of the piston only needs to be measured, so that the measurement process is simpler; and (3) reducing measurement errors: the hinge clearance measurement of the connecting rod combination or the hinge clearance and the meshing clearance measurement of the connecting rod and the gear combination are easily affected by each component, the error is large, the stroke measurement of the piston only needs to be performed on the piston, the error source is reduced, and the measurement accuracy is improved; the reliability of the mechanical system is improved: by measuring the stroke of the piston, abnormal movement conditions of the piston, such as abnormal compression piston stroke or return piston stroke, can be found in time, and can be caused by the problems of poor piston sealing, abrasion of a piston rod and the like.
Further, in the third step, referring to fig. 8, the displacement of the movement stroke of the piston 601 is L, the minimum value of the displacement is L min,Lmin is 0, that is, L min =0, =equal to the minimum value, and the maximum value of the displacement is L max,Lmax, which is determined according to a specific model, for example, 10 cm or 15 cm, where the displacement L exists in the interval of L min≤L≤Lmax, +_equal to or less; the compression stroke of the piston 601 is driven by air pressure to move, the compression stroke of the piston 601 is directional, the displacement of the compression stroke of the piston 601 is vector, and the displacement is directed from L min to L max; the return stroke of the piston 601 is driven by the elastic force of a spring to move, the return stroke of the piston 601 is directional, the displacement of the return stroke of the piston 601 is vector, and the return stroke is directed from L max to L min; referring to fig. 9, a stroke of a gap between an opening stop point is determined, the opening stop point is that the piston 601 passes through to enter a state of opening a valve plate, that is, the opening of the valve plate is changed from small to large, compression is stopped in the stroke of the piston 601, the piston 601 and the valve plate are both in a static state, after the opening stop point is determined, the piston 601 is in a return stroke, specifically, the elastic force of a spring is greater than the pressure of gas, and the piston is driven to return by the elastic force; the specific method for measuring the clearance displacement of the starting and stopping points is that the valve plate is started, the state of a compression piston is entered, the valve plate is determined to rotate, the opening degree of the valve plate is in a variable state, the compression piston is stopped, the valve plate stops rotating, the compression first displacement L 1 of the piston at the starting and stopping points is determined, then the piston enters a return state, the critical point of the valve plate in a closing state is determined, the return first displacement L 2 of the piston is determined, the difference value between the compression first displacement and the return first displacement is determined, and L 1－L2 is the clearance displacement DeltaL Opening device of the starting and stopping points.
Further, in the third step, traversing each displacement point of the piston compression stroke to obtain a gap displacement amount Δl Opening device 1、ΔL Opening device 2、ΔL Opening device 3、 ……、ΔL Opening device n, n representing a natural number, Δl Opening device n representing a gap displacement amount of the opening stop point, setting a standard value of the gap displacement amount qualification of the opening stop point, such as a set standard value of 5 mm or 8mm, if the displacement amount in Δl Opening device 1、ΔL Opening device 2、ΔL Opening device 3、 ……、ΔL Opening device n is larger than the standard value, the shutter is unqualified, and if the displacement amount in Δl Opening device 1、ΔL Opening device 2、ΔL Opening device 3、 ……、ΔL Opening device n is smaller than the standard value, the shutter is qualified; selecting a maximum value delta L Opening device max from the delta L Opening device 1、ΔL Opening device 2、ΔL Opening device 3、 ……、ΔL Opening device n array, wherein the effective displacement interval of the piston 601 for detecting the gap of the starting and stopping points is (L min+ΔL Opening device max）≤L≤Lmax, + represents addition, and the reason is that the detection method is to be satisfied is that the method comprises the steps of entering a compression piston state, determining the rotation of a valve plate, the opening of the valve plate is in a variable-large state, stopping the compression piston, stopping the rotation of the valve plate, determining the compression first displacement L 1 of the piston at the starting and stopping points, then entering a return state of the piston, determining the critical point of the valve plate in a closing state, and determining the return first displacement L 2 of the piston, wherein the requirement of the movement flow is larger than the gap space, so delta L Opening device max is selected;
Calculating the difference value of the gap displacement amounts of two adjacent starting and stopping points, and a difference value sequence of the gap displacement amounts of the starting and stopping points: the sum of the delta L Opening device 1、ΔL Opening device 2、ΔL Opening device 3、 ……、ΔL Opening device n,
ΔJ1= ΔL Opening device 2－ΔL Opening device 1
ΔJ2= ΔL Opening device 3－ΔL Opening device 2
ΔJ3= ΔL Opening device 4－ΔL Opening device 3
……
ΔJn= ΔL Opening device n+1－ΔL Opening device n
Δj n represents the difference in the gap displacement amounts of the adjacent two opening stop points, n represents a natural number, -represents subtraction, the smaller the absolute value of Δj n, the smoother the opening or closing of the shutter.
Further, in the third step, referring to fig. 10, a stroke for closing a gap at a stopping point is determined, the closing stopping point is that the valve plate is closed by the return piston 601, that is, the opening of the valve plate is changed from large to small, the return is stopped in the stroke of the return piston 601, the piston 601 and the valve plate are both in a static state, after the closing stopping point is determined, the piston 601 is in a compression stroke, specifically, the pressure of gas is greater than the elastic force of the spring, and the pressure drives the piston to compress the spring; the specific method for measuring the clearance displacement of the closing stopping point is that the valve plate is closed, the valve plate is in a return piston state, the valve plate is determined to rotate, the valve plate opening is in a reduced state, the return piston is stopped, the valve plate stops rotating, the piston at the closing stopping point is determined to return to a second displacement L 3, then the piston is in a compression state, the critical point of the valve plate in an opening state is determined, the piston compression second displacement L 4 is determined, the difference value between the compression second displacement and the return second displacement is determined, and L 4－L3 is the clearance displacement DeltaL Switch for closing of the closing stopping point.
Further, in the third step, traversing each displacement point of the piston return stroke to obtain a gap displacement amount Δl Switch for closing 1、ΔL Switch for closing 2、ΔL Switch for closing 3、 ……、ΔL Switch for closing n, n representing a natural number, Δl Switch for closing n representing a gap displacement amount of the closing stop point, setting a standard value of the gap displacement amount qualification of the closing stop point, such as a set standard value of 5 mm or 8mm, if the displacement amount in Δl Switch for closing 1、ΔL Switch for closing 2、ΔL Switch for closing 3、 ……、ΔL Switch for closing n is larger than the standard value, the shutter is unqualified, and if the displacement amount in Δl Switch for closing 1、ΔL Switch for closing 2、ΔL Switch for closing 3、 ……、ΔL Switch for closing n is smaller than the standard value, the shutter is qualified; selecting a maximum value Δl Switch for closing max from the Δl Switch for closing 1、ΔL Switch for closing 2、ΔL Switch for closing 3、 ……、ΔL Switch for closing n series, and closing the effective displacement interval of the piston 601 for detecting the gap at the stopping point to be L min≤L≤（Lmax－ΔL Switch for closing max), -indicating subtraction, because the method for detecting is to be satisfied: the valve plate is closed, a return piston state is entered, rotation of the valve plate is determined, the valve plate opening is in a reduced state, the return piston is stopped, the valve plate stops rotating, a piston return second displacement L 3 at a closing stopping point is determined, then the piston enters a compression state, a critical point of the valve plate in an opening state is determined, and a piston compression second displacement L 4 is determined; meeting the above motion process requires a larger clearance space, therefore ΔL Switch for closing max is selected;
Calculating the difference value of the gap displacement amounts of two adjacent closing stopping points, and a series of difference values of the gap displacement amounts of the closing stopping points: the sum of the delta L Switch for closing 1、ΔL Switch for closing 2、ΔL Switch for closing 3、 ……、ΔL Switch for closing n,
ΔK1= ΔL Switch for closing 2－ΔL Switch for closing 1
ΔK2= ΔL Switch for closing 3－ΔL Switch for closing 2
ΔK3= ΔL Switch for closing 4－ΔL Switch for closing 3
……
ΔKn= ΔL Switch for closing n+1－ΔL Switch for closing n
Δk n represents the difference in the gap displacement amounts of the adjacent two closing stop points, n represents a natural number, -represents subtraction, the smaller the absolute value of Δk n, the smoother the opening or closing of the shutter.
It should be noted that the technical features which are not fully explained are adopted by conventional technical means.
The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above specific embodiments, and thus any modifications or equivalent substitutions are made to the present invention; all technical solutions and modifications thereof that do not depart from the spirit and scope of the invention are intended to be included in the scope of the appended claims.
Claims (6)
1. A valve detection method is characterized by comprising the following specific steps of:
the first step, a laser ranging sensor is adopted to measure the displacement of a piston at a control end, and a rotary displacement sensor is adopted to measure the rotation angle of a valve plate; the laser ranging sensor and the rotary displacement sensor are based on the same clock signal;
The second step, the pneumatic control end of the valve adopts a gas compression piston and a spring return piston, and the air flow channel controlled by the valve plate is not connected with the air flow pipeline for measurement;
The third step, the piston and the valve plate are driven by a plurality of connecting rods or by a plurality of connecting rods and gears; the valve plate is opened, a compression piston state is entered, the valve plate is determined to rotate, the valve plate opening is in a larger state, the compression piston is stopped, the valve plate stops rotating, the compression first displacement amount of the piston at an opening stopping point is determined, then the piston enters a return state, the critical point of the valve plate in a closing state is determined, the return first displacement amount of the piston is determined, the difference value between the compression first displacement amount and the return first displacement amount is the hinge gap of a plurality of connecting rod combinations, or the hinge gap and the meshing gap of a plurality of connecting rod and gear combinations, and the difference value is the gap displacement amount at the opening stopping point; traversing each displacement point of the compression stroke of the piston, and sequentially obtaining the gap displacement quantity delta L Opening device 1、ΔL Opening device 2、ΔL Opening device 3、 ……、ΔL Opening device n of each starting and stopping point, wherein n represents a natural number; the valve plate is closed, a return piston state is entered, the valve plate is determined to rotate, the valve plate opening is in a reduced state, the return piston is stopped, the valve plate stops rotating, the piston at a closing stopping point is determined to return to a second displacement amount, then the piston enters a compression state, a critical point of the valve plate in an opening state is determined, the piston is determined to compress the second displacement amount, the difference value between the compressed second displacement amount and the return second displacement amount is the hinge gap of a plurality of connecting rod combinations, or the hinge gap and the meshing gap of a plurality of connecting rod and gear combinations, and the difference value is the gap displacement amount at the closing stopping point; and traversing each displacement point of the return stroke of the piston to sequentially obtain the clearance displacement quantity delta L Switch for closing 1、ΔL Switch for closing 2、ΔL Switch for closing 3、 ……、ΔL Switch for closing n of each closing stopping point.
2. The method according to claim 1, wherein the displacement amount of the movement stroke of the piston (601) is L, the minimum value of the displacement amount is L min,Lmin is 0, the maximum value of the displacement amount is L max, and the existence interval of the displacement amount L is L min≤L≤Lmax, which is equal to or smaller than.
3. A method of detecting a shutter according to claim 1 or 2, wherein the displacement amount of the compression stroke of the piston (601) is a vector, directed from L min to L max.
4. A method of detecting a shutter according to claim 1 or 2, wherein the displacement amount of the return stroke of the piston (601) is a vector, directed from L max to L min.
5. The method according to claim 1, wherein a maximum value Δl Opening device max is selected from Δl Opening device 1、ΔL Opening device 2、ΔL Opening device 3、 ……、ΔL Opening device n, and an effective displacement amount interval of the piston (601) for opening the stop point gap detection is (L min +ΔL Opening device max）≤L≤Lmax).
6. The method according to claim 1, wherein the maximum value Δl Switch for closing max is selected from Δl Switch for closing 1、ΔL Switch for closing 2、ΔL Switch for closing 3、 ……、ΔL Switch for closing n, and the effective displacement interval of the piston (601) for closing the stop point gap detection is L min≤L≤（Lmax－ΔL Switch for closing max.
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