Method for detecting air tightness of balance valve of hydraulic element

Abstract

The invention relates to the technical field of air tightness detection, and particularly discloses a hydraulic element balance valve air tightness detection method, which comprises the steps of presetting a detection period, dividing the detection period into a plurality of time subunits, and obtaining an actual pressure difference between an input end and an output end of a balance valve at an intermediate moment of each time subunit; the actual pressure difference is compared with a pressure difference threshold value, and the states of the time subunits are divided; wherein the state of the time subunit is divided into a standard subunit and a non-standard subunit; and on the basis of the state of the time subunit, acquiring air tightness state data of the hydraulic element balance valve, and processing the air tightness state data of the hydraulic element balance valve to complete online identification of the air tightness state. According to the air pressure loss non-numerical ratio, the air pressure deviation value ratio and the adjacent non-punctuality numerical value in the detection period, the air tightness non-punctuality value of the hydraulic element balance valve in the detection period is obtained, and therefore multi-dimensional recognition of the air tightness state is achieved, and the accuracy is high.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection, and in particular to an air tightness detection method for a hydraulic element balancing valve. Background Art

[0002] The hydraulic element balancing valve is a valve with special functions, which is mainly used in hydraulic systems to balance the flowing medium in the system and improve the balancing ability of the system.

[0003] The balancing valve determines the size of the valve core opening according to the load size (pressure), which can limit the speed of the actuator and prevent the actuator from stalling and losing pressure. In addition, the balancing valve also has the flow regulation feature, which can be adjusted through the digital lock to improve the intelligence of valve regulation.

[0004] The prior art lacks status monitoring of the hydraulic component balancing valve during use, and cannot timely and effectively identify the air tightness of the hydraulic component balancing valve, which has great limitations. Summary of the invention

[0005] The object of the present invention is to provide a method for detecting the air tightness of a hydraulic component balancing valve, by obtaining the non-number ratio of air pressure loss within the detection period by the number of non-accurate sub-units within the detection period, by processing the actual pressure difference table values ​​corresponding to the non-accurate sub-units and the standard sub-units to obtain the air pressure deviation value ratio within the detection period, and then by integrating the adjacent non-accurate time lengths of any two adjacent groups of non-accurate sub-units within the detection period to obtain the adjacent non-punctual values ​​within the detection period, and then according to the non-number ratio of air pressure loss within the detection period, the air pressure deviation value ratio and the adjacent non-punctual values, the air tightness non-accurate value of the hydraulic component balancing valve within the detection period is obtained, thereby realizing multi-dimensional identification of the air tightness status with high accuracy.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A method for detecting air tightness of a hydraulic component balancing valve comprises the following steps:

[0008] Preset a detection cycle, divide the detection cycle into a number of time sub-units, and obtain the actual pressure difference between the input end and the output end of the balancing valve at the middle moment of each time sub-unit;

[0009] Compare the actual pressure difference with the pressure difference threshold, and divide the state of the time sub-unit;

[0010] Among them, the states of time subunits are divided into standard subunits and non-quasi subunits;

[0011] Based on the state of the time subunit, the air tightness state data of the hydraulic component balancing valve is obtained, and the air tightness state data of the hydraulic component balancing valve is processed to complete the online identification of the air tightness state.

[0012] As a further solution of the present invention: the process of the progress state of the time subunit is:

[0013] If the actual pressure difference is greater than or equal to the pressure difference threshold, the time subunit is recorded as a non-quasi subunit;

[0014] If the actual pressure difference is less than the pressure difference threshold, the time subunit is recorded as a standard subunit.

[0015] As a further solution of the present invention: the process of obtaining the actual pressure difference is:

[0016] During the operation of the hydraulic element balancing valve, the pressure values ​​on both sides of the hydraulic element balancing valve are collected at the middle moment of each time sub-unit;

[0017] The difference between the output pressure value and the input pressure value is calculated to obtain the pressure difference between the input end and the output end of the balancing valve;

[0018] The difference between the pressure difference between the input and output ends of the balancing valve and the pipeline air pressure loss value is calculated to obtain the actual pressure difference of the balancing valve.

[0019] As a further solution of the present invention: the air tightness status data of the hydraulic element balancing valve includes the air pressure loss non-number ratio within the detection period, the air pressure deviation value ratio within the detection period and the adjacent non-punctual values ​​within the detection period;

[0020] The non-numerical ratio of air pressure loss during the detection period is recorded as Ys;

[0021] The pressure deviation ratio within the detection period is recorded as Yp;

[0022] The adjacent non-punctual values ​​within the detection period are recorded as St;

[0023] By formula The air tightness non-accurate value Yj of the hydraulic component balancing valve during the detection period is calculated, where d1 and d2 are both preset proportional coefficients.

[0024] As a further solution of the present invention: the process of obtaining the non-numerical ratio of air pressure loss within the detection period is:

[0025] Obtain the number of non-standard subunits and the number of standard subunits within the detection period;

[0026] The ratio of the number of non-accurate sub-units to the number of time sub-units in the detection period is calculated to obtain the non-accurate ratio of air pressure loss in the detection period.

[0027] As a further solution of the present invention: the process of obtaining the air pressure deviation value ratio within the detection period is:

[0028] Arrange all time subunits belonging to the standard subunits within the detection period, integrate the actual pressure differences corresponding to all standard subunits, and obtain an actual pressure difference group of the standard subunits;

[0029] Processing the actual pressure difference group of the standard subunit to obtain the actual pressure difference table value of the standard subunit within the detection period;

[0030] Arrange all time sub-units belonging to non-quasi sub-units within the detection period, integrate the actual pressure differences corresponding to all non-quasi sub-units, and obtain an actual pressure difference group of non-quasi sub-units;

[0031] The actual pressure difference group of the non-quasi sub-unit is processed to obtain the actual pressure difference table value of the non-quasi sub-unit within the detection period;

[0032] The actual pressure difference table value of the standard subunit in the detection period is calculated by the difference between the actual pressure difference table value of the non-standard subunit in the detection period and the absolute value is taken to obtain the pressure difference deviation value of the non-standard subunit;

[0033] The pressure difference deviation value of the non-standard sub-unit is calculated by ratio with the pressure difference threshold value to obtain the pressure deviation value ratio within the detection period.

[0034] As a further solution of the present invention: the process of obtaining adjacent non-punctual values ​​within the detection period is:

[0035] Mark all non-quasi sub-units in the detection period, obtain the intermediate time of each non-quasi sub-unit and record it as the non-quasi initial time;

[0036] The interval between the non-quasi-initial moments of any two adjacent groups of non-quasi-subunits within the detection period is recorded as the adjacent non-quasi-time length;

[0037] Sum up all adjacent non-punctual durations, and calculate the ratio of the sum to the total duration of the detection period to obtain the adjacent non-punctual ratio within the detection period;

[0038] The adjacent non-punctuality ratio within the detection period is divided by the non-punctuality number ratio within the detection period to obtain the adjacent non-punctuality value within the detection period.

[0039] As a further solution of the present invention: the ratio of the number of non-accurate sub-units in the detection period to the total duration of the detection period is calculated to obtain the non-accurate number ratio in the detection period.

[0040] As a further solution of the present invention: the limit values ​​of the non-standard value of the air tightness of the hydraulic element balancing valve in the detection period are preset to be Yj1 and Yj2, wherein Yj1<Yj2;

[0041] When Yj < Yj1, it indicates that the airtightness of the hydraulic component balance valve is overall good during the detection period, and a good signal of the hydraulic component balance valve state is obtained;

[0042] When Yj1 ≤ Yj < Yj2, it indicates that the airtightness of the hydraulic component balance valve is average during the detection period, and an average signal of the hydraulic component balance valve state is obtained;

[0043] When Yj ≥ Yj2, it indicates that the airtightness of the hydraulic component balance valve is poor during the detection period, and a poor signal of the hydraulic component balance valve state is obtained.

[0044] Advantages of the present invention: During the airtightness detection of the hydraulic component balance valve, a preset detection period is set, and the detection period is divided into several time sub-units. The classification and recognition of the time sub-units are completed according to the pressure difference between the input end and the output end of the hydraulic component balance valve in each time sub-unit;

[0045] And according to the processing of non-standard sub-units and standard sub-units during the detection period, that is, the non-air-pressure-loss ratio during the detection period is obtained by the number of non-standard sub-units during the detection period, the air-pressure deviation value ratio during the detection period is obtained by processing the actual pressure difference table values corresponding to the non-standard sub-units and the standard sub-units, and then the adjacent non-standard duration of any two adjacent groups of non-standard sub-units during the detection period is integrated and processed to obtain the adjacent non-standard time value during the detection period. Furthermore, the non-standard airtightness value of the hydraulic component balance valve during the detection period is obtained according to the non-air-pressure-loss ratio, the air-pressure deviation value ratio, and the adjacent non-standard time value during the detection period, thereby realizing the multi-dimensional recognition of the airtightness state with high accuracy. Description of the Drawings

[0046] The following further describes the present invention with reference to the drawings.

[0047] Figure 1 is a flowchart of a method for detecting the airtightness of a hydraulic component balance valve according to an embodiment of the present invention;

[0048] Figure 2 is a flowchart of the recognition of the airtightness state of a hydraulic component balance valve in a method for detecting the airtightness of a hydraulic component balance valve according to an embodiment of the present invention. Detailed Embodiments

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] Embodiment 1

[0051] See also Figure 1 As shown, the present invention is a method for detecting air tightness of a hydraulic component balancing valve, comprising the following steps:

[0052] Preset a detection cycle, divide the detection cycle into a number of time sub-units, and obtain the actual pressure difference between the input end and the output end of the balancing valve at the middle moment of each time sub-unit;

[0053] Compare the actual pressure difference with the pressure difference threshold, and divide the state of the time sub-unit;

[0054] Among them, the states of time subunits are divided into standard subunits and non-quasi subunits;

[0055] Based on the status of the time subunit, the air tightness status of the hydraulic component balancing valve is identified online.

[0056] Among them, the detection period includes but is not limited to 10 days, 20 days and 30 days.

[0057] Example 2

[0058] In each time subunit, the specific process of comparing the actual pressure difference with the pressure difference threshold is as follows:

[0059] During the operation of the hydraulic element balancing valve, the pressure values ​​on both sides of the hydraulic element balancing valve are collected at the middle moment of the time subunit, that is:

[0060] A pressure gauge is provided on one side (input end) of the hydraulic element balancing valve, and the pressure value on one side of the hydraulic element balancing valve is collected by the pressure gauge to obtain the input pressure value;

[0061] A pressure gauge is provided on the other side (output end) of the hydraulic element balancing valve, and the pressure value on the other side of the hydraulic element balancing valve is collected by the pressure gauge to obtain the output pressure value;

[0062] The difference between the output pressure value and the input pressure value is calculated to obtain the pressure difference between the input end and the output end of the balancing valve;

[0063] The difference between the pressure difference between the input and output ends of the balancing valve and the air pressure loss value of the pipeline is calculated to obtain the actual pressure difference of the balancing valve;

[0064] Among them, the process of obtaining the pipeline air pressure loss value is:

[0065] By formula Calculate the pipeline gas pressure loss value;

[0066] Among them, γ is the friction coefficient, L is the length of the pipeline (that is, the distance between the sampling point at the input end of the hydraulic element balancing valve and the sampling point at the output end of the hydraulic element balancing valve), d is the pipeline diameter, ρ is the fluid density, and V is the fluid velocity.

[0067] Preset the pressure difference threshold and compare the actual pressure difference with the pressure difference threshold:

[0068] If the actual pressure difference is greater than or equal to the pressure difference threshold, it means that the air pressure loss of the hydraulic element balance valve in the time sub-unit is abnormal, and the time sub-unit is recorded as a non-quasi sub-unit;

[0069] If the actual pressure difference is less than the pressure difference threshold, it means that the air pressure loss of the hydraulic element balancing valve in the time sub-unit is within the normal range, and the time sub-unit is recorded as a standard sub-unit.

[0070] Obtain the number of non-standard sub-units and the number of standard sub-units in the detection period, calculate the ratio of the number of non-standard sub-units to the number of time sub-units in the detection period, and obtain the non-standard ratio of air pressure loss in the detection period;

[0071] Arrange all time subunits belonging to the standard subunits within the detection period, integrate the actual pressure differences corresponding to all standard subunits, and obtain an actual pressure difference group of the standard subunits;

[0072] The actual pressure difference of each standard subunit is recorded as Bc i, where i is the number of standard subunits, i=1, 2, ..., n; and the actual pressure difference groups of the standard subunits are obtained as Bc1, Bc2, Bc3, ..., Bcn;

[0073] According to the formula The standard deviation value Bcb of the actual pressure difference group of the standard subunit is calculated, wherein Bcp is the actual pressure difference group Bc1, Bc2, Bc3, ..., Bcn;

[0074] If the standard deviation value Bcb of the actual pressure difference group of the standard subunit is greater than or equal to the preset standard deviation value Bcby, the maximum value and / or the minimum value in the actual pressure difference group data of the standard subunit is deleted, and the standard deviation value Bcb of the actual pressure difference group data of the standard subunit is calculated again, until Bcb is less than the preset standard deviation value Bcby, the remaining data in the actual pressure difference group of the standard subunit is summed and averaged to obtain the actual pressure difference table value of the standard subunit within the detection period;

[0075] Arrange all time subunits belonging to non-quasi subunits within the detection period, integrate the actual pressure differences corresponding to all non-quasi subunits, and obtain an actual pressure difference group of non-quasi subunits;

[0076] The actual pressure difference of each non-quasi sub-unit is recorded as Fcj, where j is the number of standard sub-units, j=1, 2, ...., m; and the actual pressure difference group of non-quasi sub-units is obtained as Fc1, Fc2, Fc3, ...., Fcm;

[0077] According to the formula The standard deviation value Fcb of the actual pressure difference group of the non-quasi-subunit is calculated, wherein Fcp is the actual pressure difference group Fc1, Fc2, Fc3, ..., Fcn;

[0078] If the standard deviation value Fcb of the actual pressure difference group of the non-quasi sub-unit is greater than or equal to the preset standard deviation value Fcby, the maximum value and / or the minimum value in the actual pressure difference group data of the non-quasi sub-unit is deleted, and the standard deviation value Fcb of the actual pressure difference group data of the non-quasi sub-unit is calculated again, until Fcb is less than the preset standard deviation value Fcby, the remaining data in the actual pressure difference group of the non-quasi sub-unit are summed and averaged to obtain the actual pressure difference table value of the non-quasi sub-unit within the detection period;

[0079] The actual pressure difference table value of the standard subunit in the detection period is calculated by the difference between the actual pressure difference table value of the non-standard subunit in the detection period and the absolute value is taken to obtain the pressure difference deviation value of the non-standard subunit;

[0080] The pressure difference deviation value of the non-standard sub-unit is calculated by ratio with the pressure difference threshold value to obtain the pressure deviation value ratio within the detection period;

[0081] Mark all non-quasi sub-units in the detection period, obtain the intermediate time of each non-quasi sub-unit and record it as the non-quasi initial time;

[0082] The interval between the non-quasi-initial moments of any two adjacent groups of non-quasi-subunits within the detection period is recorded as the adjacent non-quasi-time length;

[0083] Sum up all adjacent non-punctual durations, and calculate the ratio of the sum to the total duration of the detection period to obtain the adjacent non-punctual ratio within the detection period;

[0084] The ratio of the number of non-accurate sub-units in the detection period to the total duration of the detection period is calculated to obtain the non-accurate number ratio in the detection period;

[0085] The adjacent non-punctuality ratio within the detection period is divided by the non-punctuality number ratio within the detection period to obtain the adjacent non-punctuality value within the detection period;

[0086] The non-numerical ratio of air pressure loss during the detection period is recorded as Ys;

[0087] The pressure deviation ratio within the detection period is recorded as Yp;

[0088] The adjacent non-punctual values ​​within the detection period are recorded as St;

[0089] Through the formula Calculate the non-standard airtightness value Yj of the hydraulic component balance valve within the detection period, where d1 and d2 are both preset proportionality coefficients, and both d1 and d2 are greater than zero.

[0090] Embodiment 3

[0091] Refer to Figure 2 , the limit values of the non-standard airtightness value of the preset hydraulic component balance valve within the detection period are Yj 1 and Yj2, where Yj 1 < Yj2;

[0092] Among them, the limit values Yj1 and Yj2 of the non-standard airtightness value are an empirical value, obtained according to experience:

[0093] In the actual obtaining process, there are many groups of non-pressure-loss ratios within the detection period, air pressure deviation ratios within the detection period, and adjacent non-standard numerical values within the detection period. Process the non-pressure-loss ratios within the detection period, air pressure deviation ratios within the detection period, and adjacent non-standard numerical values within the detection period for many groups to obtain the corresponding group of non-standard airtightness values. The staff identify the state level of the hydraulic component balance valve within the detection period based on so many groups of non-standard airtightness values, thereby obtaining a corresponding relationship between the non-standard airtightness value and the state level of the hydraulic component balance valve within the detection period. Furthermore, deduce and divide the non-standard airtightness value threshold according to the state of the hydraulic component balance valve with the non-standard airtightness value within the detection period, so as to obtain the limit values Yj1 and Yj2 of the non-standard airtightness value. By comparing the limit values of the non-standard airtightness value, the identification of the state level of the hydraulic component balance valve corresponding to the non-standard airtightness value within the detection period is completed;

[0094] When Yj < Yj 1, it indicates that the overall airtightness of the hydraulic component balance valve within the detection period is good, and a good signal of the hydraulic component balance valve state is obtained;

[0095] When Yj 1 ≤ Yj < Yj2, it indicates that the airtightness of the hydraulic component balance valve within the detection period is average, and an average signal of the hydraulic component balance valve state is obtained;

[0096] When Yj ≥ Yj2, it indicates that the airtightness of the hydraulic component balance valve within the detection period is poor, and a poor signal of the hydraulic component balance valve state is obtained;

[0097] Thus, the identification and judgment of the airtightness state of the hydraulic component balance valve within the detection period are completed.

[0098] In a specific embodiment, it is also possible to collect the non-standard airtightness values of the hydraulic component balance valve corresponding to multiple detection periods, and complete the identification and judgment of the airtightness change trend of the hydraulic component balance valve according to the non-standard airtightness values of the hydraulic component balance valve in multiple detection periods;

[0099] Specifically, a plane coordinate system is established, with the time sequence of the detection cycle as the X-axis and the airtightness non-accuracy value as the Y-axis, and the airtightness non-accuracy value of the hydraulic element balancing valve corresponding to each detection cycle is plotted in the plane coordinate system, and the plotted points are connected in time sequence through a smooth curve to obtain a periodically changing airtightness non-accuracy value curve, and the airtightness change trend of the hydraulic element balancing valve is identified and judged according to the changing state of the airtightness non-accuracy value curve.

[0100] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for detecting the air tightness of a hydraulic component balancing valve, characterized in that: The following steps are involved: Preset a detection cycle, divide the detection cycle into a number of time sub-units, and obtain the actual pressure difference between the input end and the output end of the balancing valve at the middle moment of each time sub-unit; Compare the actual pressure difference with the pressure difference threshold, and divide the state of the time sub-unit; Among them, the states of time subunits are divided into standard subunits and non-quasi subunits; Based on the state of the time subunit, the air tightness state data of the hydraulic component balancing valve is obtained, and the air tightness state data of the hydraulic component balancing valve is processed to complete the online identification of the air tightness state.

2. A method for detecting air tightness of a hydraulic component balancing valve according to claim 1, characterized in that: The process of the state of the time subunit is: If the actual pressure difference is greater than or equal to the pressure difference threshold, the time subunit is recorded as a non-quasi subunit; If the actual pressure difference is less than the pressure difference threshold, the time subunit is recorded as a standard subunit.

3. A method for detecting air tightness of a hydraulic component balancing valve according to claim 1, characterized in that: The process of obtaining the actual pressure difference is: During the operation of the hydraulic element balancing valve, the pressure values ​​on both sides of the hydraulic element balancing valve are collected at the middle moment of each time sub-unit; The difference between the output pressure value and the input pressure value is calculated to obtain the pressure difference between the input end and the output end of the balancing valve; The difference between the pressure difference between the input and output ends of the balancing valve and the pipeline air pressure loss value is calculated to obtain the actual pressure difference of the balancing valve.

4. A method for detecting air tightness of a hydraulic component balancing valve according to claim 1, characterized in that: The air tightness status data of the hydraulic component balancing valve includes the non-number ratio of air pressure loss within the detection period, the air pressure deviation ratio within the detection period, and the adjacent non-punctual values ​​within the detection period; The non-numerical ratio of air pressure loss during the detection period is recorded as Ys; The pressure deviation ratio within the detection period is recorded as Yp; The adjacent non-punctual values ​​within the detection period are recorded as St; By formula The air tightness non-accurate value Yj of the hydraulic component balancing valve during the detection period is calculated, where d1 and d2 are both preset proportional coefficients.

5. A method for detecting air tightness of a hydraulic component balancing valve according to claim 4, characterized in that: The process of obtaining the non-digital ratio of air pressure loss within the detection period is as follows: Obtain the number of non-standard subunits and the number of standard subunits within the detection period; The ratio of the number of non-accurate sub-units to the number of time sub-units in the detection period is calculated to obtain the non-accurate ratio of air pressure loss in the detection period.

6. A method for detecting air tightness of a hydraulic component balancing valve according to claim 4, characterized in that: The process of obtaining the air pressure deviation ratio within the detection period is as follows: Arrange all time subunits belonging to the standard subunits within the detection period, integrate the actual pressure differences corresponding to all standard subunits, and obtain an actual pressure difference group of the standard subunits; Processing the actual pressure difference group of the standard subunit to obtain the actual pressure difference table value of the standard subunit within the detection period; Arrange all time sub-units belonging to non-quasi sub-units within the detection period, integrate the actual pressure differences corresponding to all non-quasi sub-units, and obtain an actual pressure difference group of non-quasi sub-units; The actual pressure difference group of the non-quasi sub-unit is processed to obtain the actual pressure difference table value of the non-quasi sub-unit within the detection period; The actual pressure difference table value of the standard subunit in the detection period is calculated by the difference between the actual pressure difference table value of the non-standard subunit in the detection period and the absolute value is taken to obtain the pressure difference deviation value of the non-standard subunit; The pressure difference deviation value of the non-standard sub-unit is calculated by ratio with the pressure difference threshold value to obtain the pressure deviation value ratio within the detection period.

7. A method for detecting air tightness of a hydraulic component balancing valve according to claim 4, characterized in that: The process of obtaining adjacent non-punctual values ​​within the detection period is: Mark all non-quasi sub-units in the detection period, obtain the intermediate time of each non-quasi sub-unit and record it as the non-quasi initial time; Denote the interval time between the non-standard initial moments of any two adjacent groups of non-standard sub-units within the detection period as the adjacent non-standard duration; Sum up all the adjacent non-standard durations, and calculate the ratio of the obtained sum value to the total duration of the detection period to obtain the adjacent non-standard ratio within the detection period; The adjacent non-standard ratio within the detection period is divided by the non-standard number ratio within the detection period to obtain the adjacent non-standard numerical value within the detection period.

8. A method for detecting air tightness of a hydraulic component balancing valve according to claim 7, characterized in that: Calculate the ratio of the number of non-standard sub-units within the detection period to the total duration of the detection period to obtain the non-standard number ratio within the detection period.

9. A method for detecting air tightness of a hydraulic component balancing valve according to claim 1, characterized in that: Preset the limit values of the airtightness non-standard value of the hydraulic component balance valve within the detection period as Yj1 and Yj2, where Yj1 < Yj2; When Yj < Yj1, it indicates that the airtightness of the hydraulic component balance valve is generally good within the detection period, and a good state signal of the hydraulic component balance valve is obtained; When Yj1 ≤ Yj < Yj2, it indicates that the airtightness of the hydraulic component balance valve is average within the detection period, and an average state signal of the hydraulic component balance valve is obtained; When Yj ≥ Yj2, it indicates that the airtightness of the hydraulic component balance valve is poor within the detection period, and a poor state signal of the hydraulic component balance valve is obtained.

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