Method and device for checking mounting position of liquid level sensor in rocket storage tank

Abstract

The invention relates to the technical field of rocket detection, in particular to a method and device for checking the mounting position of a liquid level sensor in a rocket storage tank. The checking method comprises the following steps: S1, constructing a storage tank three-dimensional model at a preset mounting position of a liquid level sensor in a storage tank; s2, measuring initial capacitance; s3, a detection reagent is dropwise added to the preset installation position of each liquid level sensor, and the capacitance value change condition is obtained; and S4, determining whether the mounting position of each liquid level sensor is correct or not according to the change condition of the capacitance value. The principle that the dielectric constant of a detection reagent is different from that of air is utilized to test whether capacitance changes or not, the proper detection reagent is adopted, the tiny deviation of the mounting position of the sensor can be sensitively detected according to the capacitance value change condition, the detection precision is improved, the influence of human factors is small, and the detection result is reliable; the method is simple in operation, does not need complex equipment, can quickly complete the inspection of a large batch of sensors, and improves the efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rocket detection, in particular to a method for checking the installation position of a liquid level sensor in a rocket tank and a device thereof. BACKGROUND

[0002] The liquid level sensor in the liquid rocket tank is used to monitor the remaining amount of propellant, to ensure that the engine has enough fuel and oxidizer. Whether the installation position of the liquid level sensor meets the design requirements directly affects whether the liquid level data in the rocket tank is accurate, and further affects the working state and safety of the rocket engine. Therefore, checking the installation position of the liquid level sensor in the liquid rocket tank is an important step. The traditional method for checking the installation position of the liquid level sensor mainly relies on manual visual inspection and paper comparison, which has the following shortcomings: 1. Low precision: manual visual inspection cannot accurately determine whether the sensor completely matches the predetermined position, and deviation may occur.

[0003] 2. Complex detection: the environment in the liquid rocket tank is dark, and it is relatively complex to rely on manual search for the position of the liquid level sensor.

[0004] 3. Poor reliability: manual inspection is easily affected by human factors, and there is a risk of missed detection and false detection. SUMMARY

[0005] The present application provides a method for checking the installation position of a liquid level sensor in a rocket tank and a device thereof, to solve the defects of low precision, complex detection and poor reliability in the prior art relying on manual visual inspection and paper comparison.

[0006] The present application provides a method for checking the installation position of a liquid level sensor in a rocket tank, comprising: According to the design drawing of the tank, the predetermined installation position of the liquid level sensor in the tank is determined, a three-dimensional model of the tank is constructed according to the predetermined installation position of the liquid level sensor in the tank, and the preset installation position of each liquid level sensor is determined in the three-dimensional model of the tank; Connect the bridge of each liquid level sensor, and measure the initial capacitance; Drop the detection reagent at the preset installation position of each liquid level sensor, and obtain the capacitance value change; According to the capacitance value change, it is determined whether the installation position of each liquid level sensor is correct.

[0007] According to the method for checking the installation position of the liquid level sensor in the rocket tank provided by the present application, the liquid level sensor comprises a continuous liquid level sensor, a single-point liquid level sensor, a double-point liquid level sensor and a depletion shutdown liquid level sensor; the preset installation position of each liquid level sensor in the three-dimensional model of the tank is determined, specifically comprising: According to the position and type of the liquid level sensor, the preset installation positions of the first continuous liquid level sensor, the single-point liquid level sensor and the double-point liquid level sensor located on the upper bottom of the storage tank in the three-dimensional model are determined, and the preset installation positions of the run-out shutdown liquid level sensor and the second continuous liquid level sensor located on the lower bottom of the storage tank in the three-dimensional model are determined.

[0008] The method for checking the installation position of the liquid level sensor in the rocket storage tank provided by the application determines whether the installation position of each liquid level sensor is correct according to the change of the capacitance value, and specifically includes the following steps. Setting a capacitance change threshold value. According to the size relationship between the capacitance value change value of the liquid level sensor and the capacitance change threshold value, it is determined whether the installation position of the liquid level sensor is correct.

[0009] The method for checking the installation position of the liquid level sensor in the rocket storage tank provided by the application determines whether the installation position of each liquid level sensor is correct according to the size relationship between the capacitance value change value of the liquid level sensor and the capacitance change threshold value, and specifically includes the following steps. If the capacitance value change value of the liquid level sensor is less than or equal to the capacitance change threshold value, it is determined that the installation position of the liquid level sensor is incorrect. If the capacitance value change value of the liquid level sensor is greater than the capacitance change threshold value, it is determined that the installation position of the liquid level sensor is correct.

[0010] The method for checking the installation position of the liquid level sensor in the rocket storage tank provided by the application determines whether the installation position of each liquid level sensor is correct according to the size relationship between the capacitance value change value of the liquid level sensor and the capacitance change threshold value, and specifically includes the following steps. If the capacitance value change value of the detected liquid level sensor is greater than the capacitance change threshold value, and the capacitance value change value of at least one undetected liquid level sensor is also greater than the capacitance change threshold value, it is determined that at least one of the installation positions of the liquid level sensors whose capacitance value change value is greater than the capacitance change threshold value is incorrect.

[0011] The method for checking the installation position of the liquid level sensor in the rocket storage tank provided by the application further includes the following steps after determining that the installation position of the liquid level sensor is incorrect. Adjust the installation position of the liquid level sensor, add the detection reagent at the adjusted installation position, and obtain the current capacitance value change until the capacitance value change value of the liquid level sensor is greater than the capacitance change threshold value.

[0012] The method for checking the installation position of the liquid level sensor in the rocket storage tank provided by the application includes the following steps for the installation position detection method of the double-point liquid level sensor. A detection reagent is added at the first point of the two-point liquid level sensor, and the capacitance value change of the first point and the second point is obtained; A detection reagent is added at the second point of the two-point liquid level sensor, and the capacitance value change of the first point and the second point is obtained; According to the capacitance value changes of the first point and the second point in the two detections, whether the installation position of the two-point liquid level sensor is correct is determined.

[0013] According to the rocket tank liquid level sensor installation position checking method provided by the application, the installation position detection method for multiple point liquid level sensors specifically includes: A detection reagent is added at one of the point liquid level sensors, and the capacitance value changes of the point liquid level sensor to which the detection reagent is added and the point liquid level sensor to which the detection reagent is not added are obtained; According to the capacitance value changes of the point liquid level sensor to which the detection reagent is added and the point liquid level sensor to which the detection reagent is not added, whether the installation position of the point liquid level sensor is correct is determined.

[0014] According to the rocket tank liquid level sensor installation position checking method provided by the application, the installation position detection method for continuous liquid level sensors specifically includes: A detection reagent is added at one end of the continuous liquid level sensor, and the capacitance value changes of the odd capacitor and the even capacitor of the continuous liquid level sensor are obtained; A detection reagent is added at the other end of the continuous liquid level sensor, and the capacitance value changes of the odd capacitor and the even capacitor of the continuous liquid level sensor are obtained; According to the capacitance value changes of the odd capacitor and the even capacitor of the continuous liquid level sensor, whether the installation position of the continuous liquid level sensor is correct is determined.

[0015] The application also provides a rocket tank liquid level sensor installation position checking system, which includes: A dropping device for adding a detection reagent to a predetermined installation position of a liquid level sensor; A detection device for detecting the initial capacitance and capacitance value change of the liquid level sensor; A controller for determining the predetermined installation position of the liquid level sensor in the tank according to the design drawing of the tank, constructing a three-dimensional model of the tank according to the predetermined installation position of the liquid level sensor in the tank, determining the predetermined installation position of each liquid level sensor in the three-dimensional model of the tank, and determining whether the installation position of each liquid level sensor is correct according to the capacitance value change.

[0016] The application provides a rocket tank internal liquid level sensor installation position checking method, which comprises the following steps: S1, determining a predetermined installation position of the liquid level sensor in the tank according to a design drawing of the tank, constructing a tank three-dimensional model according to the predetermined installation position of the liquid level sensor in the tank, and determining a preset installation position of each liquid level sensor in the tank three-dimensional model; S2, connecting a bridge to each liquid level sensor and measuring an initial capacitance; S3, adding a detection reagent at the preset installation position of each liquid level sensor and obtaining a capacitance value change condition; and S4, determining whether the installation position of each liquid level sensor is correct according to the capacitance value change condition. The rocket tank internal liquid level sensor installation position checking method and device provided by the application can sensitively detect a small deviation of the sensor installation position by using the principle that the dielectric constant of the detection reagent is different from that of air, testing whether the capacitance changes, and adopting a suitable detection reagent, thereby improving the checking precision, reducing the influence of human factors, and improving the reliability of the checking result; the method is simple to operate, does not require complex equipment, and can quickly complete the checking of a large number of sensors, thereby improving the efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is one of the flowcharts of the rocket tank internal liquid level sensor installation position checking method provided in one of the embodiments of the present application.

[0019] Figure 2 is a schematic diagram of the constructed tank three-dimensional model provided in one of the embodiments of the present application. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described clearly and completely in the following with reference to the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0021] In the description of the present embodiments, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the present embodiments and simplifying the description, and therefore cannot be construed to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present embodiments.

[0022] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be construed to indicate or imply relative importance or an implied indication of the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present embodiments, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0023] In the present embodiments, unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "linked", "fixed", and the like should be broadly understood, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be a communication or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present embodiments can be understood according to the specific circumstances.

[0024] In the present embodiments, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over", and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under", and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0025] The following will be described in conjunction with Figure 1 A method for checking the installation position of a liquid level sensor in a rocket tank is described. The method for checking the installation position of the liquid level sensor in the rocket tank includes the following steps: S1, determine the predetermined installation position of the liquid level sensor in the tank according to the design drawing of the tank, construct a three-dimensional model of the tank according to the predetermined installation position of the liquid level sensor in the tank, and determine the preset installation position of each liquid level sensor in the three-dimensional model of the tank; S2, connect the bridge to each liquid level sensor, and measure the initial capacitance; S3, drop the detection reagent at the preset installation position of each liquid level sensor, and obtain the capacitance value change; S4, determine whether the installation position of each liquid level sensor is correct according to the capacitance value change.

[0026] Specifically, the purpose of step S1 is to determine the predetermined installation position of the liquid level sensor. First, obtain the design drawing of the tank, and determine the predetermined installation position of the liquid level sensor in the tank according to the design drawing; then, three-dimensional modeling is performed according to the design drawing and the predetermined installation position of the liquid level sensor marked in the design drawing, and the three-dimensional model has the shape and size information of the tank and the position information of each liquid level sensor in the tank. It can be understood that the design drawing can be scanned by a scanning device, and the scanned image can be input into the computer storage by a recognition module.

[0027] The purpose of step S2 is to determine the initial capacitance of each liquid level sensor, which provides a reference for subsequent determination of whether the capacitance changes. In order to ensure the sealing of the liquid level sensor, all the liquid level sensors in the tank are generally connected to low-frequency lines, which are led out of the tank and then crimped to ensure electrical connection and sealing. Then, connect the low-frequency lines to the sealed connector in sequence for easy line management and sealing. At this time, in order to measure the capacitance of the liquid level sensor, a plug is used to connect the sealed connector, and the plug leads out the corresponding sensor line. At this time, the capacitance of the corresponding sensor can be measured by measuring the corresponding line through the bridge, and the initial capacitance value of each sensor is recorded. The plug is a kind of existing tooling connector used to connect the corresponding sensor.

[0028] The purpose of step S3 is to test whether the capacitance changes by dropping the detection reagent, which uses the principle that the dielectric constant of the detection reagent is different from that of air. Using appropriate detection reagent, the small deviation of the sensor installation position can be sensitively detected, and the checking accuracy is improved. Generally, alcohol reagent can be used. The preset installation position of the sensor in the three-dimensional model can be obtained by a mechanical hand, and an appropriate amount of alcohol is dropped. The amount of alcohol dropped should be sufficient to cover the sensing part of the sensor.

[0029] The purpose of step S4 is to determine whether the installation position of the liquid level sensor is correct by the capacitance change of the liquid level sensor. For example, using the principle that the dielectric constant of alcohol is different from that of air, the sensor capacitance value after dropping alcohol is measured and recorded, and whether it changes is observed. If the capacitance value changes, it can be preliminarily judged that the installation position is correct; if the capacitance value does not change, it can be preliminarily judged that the installation position is incorrect.

[0030] The application provides a method for checking the installation position of a liquid level sensor in a rocket tank, which comprises the following steps: S1, determining the predetermined installation position of the liquid level sensor in the tank according to the design drawing of the tank, constructing a three-dimensional model of the tank according to the predetermined installation position of the liquid level sensor in the tank, and determining the preset installation position of each liquid level sensor in the three-dimensional model of the tank; S2, connecting an electric bridge to each liquid level sensor and measuring the initial capacitance; S3, adding a detection reagent to the preset installation position of each liquid level sensor and obtaining the capacitance value change; and S4, determining whether the installation position of each liquid level sensor is correct according to the capacitance value change. The method for checking the installation position of a liquid level sensor in a rocket tank can sensitively detect the slight deviation of the installation position of the sensor by using the principle that the dielectric constant of the detection reagent is different from that of air, testing whether the capacitance changes, and adopting a suitable detection reagent, thereby improving the checking accuracy, being less affected by human factors, and being reliable in the checking result; the method is simple to operate, does not require complex equipment, and can quickly complete the checking of a large number of sensors, thereby improving the efficiency.

[0031] In one of the embodiments of the application, the liquid level sensor comprises a continuous liquid level sensor, a single-point liquid level sensor, a double-point liquid level sensor, and a depletion shutdown liquid level sensor; and the step of determining the preset installation position of each liquid level sensor in the three-dimensional model of the tank specifically comprises the following steps: according to the position and type of the liquid level sensor, determining the preset installation position of the first continuous liquid level sensor, the single-point liquid level sensor and the double-point liquid level sensor on the upper bottom of the tank in the three-dimensional model, and determining the preset installation position of the depletion shutdown liquid level sensor and the second continuous liquid level sensor on the lower bottom of the tank in the three-dimensional model. In this embodiment, nine liquid level sensors are determined to be installed in the rocket tank according to the design drawing, and are located at different positions of the tank, wherein the upper bottom of the tank comprises one continuous liquid level sensor, two single-point liquid level sensors and one double-point liquid level sensor; and the lower bottom of the tank comprises four depletion shutdown liquid level sensors and one continuous liquid level sensor. For the above liquid level sensors, the installation position is determined to be correct or not by adding alcohol and observing the capacitance value change, but there may be differences in the specific operation according to different types and specifications of the liquid level sensors.

[0032] In one of the embodiments of the present application, the step of determining whether the installation position of each liquid level sensor is correct according to the change of the capacitance value, i.e. step S4, specifically comprises: S41, setting a capacitance change threshold; S42, determining whether the installation position of the liquid level sensor is correct according to the size relationship between the capacitance value change of the liquid level sensor and the capacitance change threshold. In this embodiment, the capacitance change threshold is preset before the alcohol is added dropwise, and then the capacitance value change of the liquid level sensor is compared with the capacitance change threshold to determine whether the installation position of the liquid level sensor is correct.

[0033] In one of the embodiments of the present application, the step of determining whether the installation position of each liquid level sensor is correct according to the size relationship between the capacitance value change of the liquid level sensor and the capacitance change threshold, i.e. step S42, specifically comprises: if the capacitance value change of the liquid level sensor is less than or equal to the capacitance change threshold, it indicates that the capacitance value change is not obvious, and at this time, it can be preliminarily judged that the position of adding alcohol is different from the capacitance detection position, and it is determined that the installation position of the liquid level sensor is incorrect; if the capacitance value change of the liquid level sensor is greater than the capacitance change threshold, it indicates that the capacitance value change is obvious, and it indicates that the capacitance value change is caused by the alcohol added dropwise, and it can be preliminarily judged that the position of adding alcohol is consistent with the capacitance detection position, and it is determined that the installation position of the liquid level sensor is correct.

[0034] In one of the embodiments of the present application, the step of determining whether the installation position of each liquid level sensor is correct according to the size relationship between the capacitance value change of the liquid level sensor and the capacitance change threshold, i.e. step S42, specifically comprises: if the capacitance value change of the liquid level sensor is less than or equal to the capacitance change threshold, it indicates that the capacitance value change is not obvious, and at this time, it can be preliminarily judged that the position of adding alcohol is different from the capacitance detection position, and it is determined that the installation position of the liquid level sensor is incorrect; if the capacitance value change of the liquid level sensor is greater than the capacitance change threshold, it indicates that the capacitance value change is obvious, and it indicates that the capacitance value change is caused by the alcohol added dropwise, and it can be preliminarily judged that the position of adding alcohol is consistent with the capacitance detection position, and it is determined that the installation position of the liquid level sensor is correct.

[0035] In one of the embodiments of the present application, after it is determined that the installation position of the liquid level sensor is incorrect, the method further comprises the following step: S43, adjusting the installation position of the liquid level sensor, adding the detection reagent at the adjusted installation position, and obtaining the current capacitance value change until the capacitance value change of the liquid level sensor is greater than the capacitance change threshold. The installation position of the liquid level sensor which is incorrect is adjusted, and whether the current position is correctly installed is determined through the capacitance change. After multiple tests and fine adjustment, the correct position of the liquid level sensor can be found.

[0036] In one embodiment of the present application, the installation position detection method for the two-point liquid level sensor specifically comprises the following detection steps: S101, adding detection reagent at the first point of the two-point liquid level sensor, and obtaining the capacitance value change of the first point and the second point; S102, adding detection reagent at the second point of the two-point liquid level sensor, and obtaining the capacitance value change of the first point and the second point; S103, determining whether the installation position of the two-point liquid level sensor is correct according to the capacitance value changes of the first point and the second point in the two detections.

[0037] In one embodiment of the present application, the installation position detection method for the multi-point liquid level sensor specifically comprises the following detection steps: S201, adding detection reagent at one of the point liquid level sensors, and obtaining the capacitance value changes of the point liquid level sensor to which the detection reagent is added and the point liquid level sensor to which the detection reagent is not added; S202, determining whether the installation position of the point liquid level sensor is correct according to the capacitance value changes of the point liquid level sensor to which the detection reagent is added and the point liquid level sensor to which the detection reagent is not added.

[0038] In one embodiment of the present application, the installation position detection method for the continuous liquid level sensor specifically comprises the following detection steps: S301, adding detection reagent at one end of the continuous liquid level sensor, and obtaining the capacitance value changes of the odd capacitor and the even capacitor of the continuous liquid level sensor; S302, adding detection reagent at the other end of the continuous liquid level sensor, and obtaining the capacitance value changes of the odd capacitor and the even capacitor of the continuous liquid level sensor; S303, determining whether the installation position of the continuous liquid level sensor is correct according to the capacitance value changes of the odd capacitor and the even capacitor of the continuous liquid level sensor. The odd capacitor represents the capacitor at the odd position on the continuous liquid level sensor, and the even capacitor represents the capacitor at the even position on the continuous liquid level sensor. For example, in the structure as shown in FIG. 1, the definition is as follows: six capacitors are arranged on the continuous liquid level sensor, and are numbered as 1-6 in sequence according to the positions, the odd capacitor is the capacitor numbered with an odd number, and the even capacitor is the capacitor numbered with an even number. Figure 2

[0039] The following specific detection process is provided for the above-mentioned various liquid level sensors: Multiple liquid level sensors need to be installed in the rocket tank, and are installed on the top, bottom or side wall of the tank. First, the predetermined installation positions of all the liquid level sensors in the tank are determined according to the design drawings of the tank, a three-dimensional model of the tank and the liquid level sensors is constructed, and the three-dimensional coordinates of the tank and the liquid level sensors are determined, the three-dimensional coordinates are sent to the equipment for adding detection reagent, and the detection reagent is added according to the coordinates.

[0040] According to Figure 2 ​As shown, it is a schematic diagram of the constructed three-dimensional model, the left end is the upper bottom of the tank, the right end is the lower bottom of the tank, and the installation positions of the various liquid level sensors are determined. By delimiting quadrants, for example, the I quadrant and the III quadrant marked out, and the II quadrant and the IV quadrant not marked out can also be included to confirm the positions of the liquid level sensors. The corresponding sensor lines are led out to connect with the bridge, and the initial capacitance values of the various liquid level sensors are recorded.

[0041] The point number definition is led out. The following point numbers represent the collection points of the liquid level sensors. For example, the double-point liquid level sensor has two collection points, namely, the I point and the II point. The point numbers A and B indicate the corresponding contacts led out by the liquid level sensor. The odd capacitance and the even capacitance adopt a shared negative electrode, that is, 43 / 44 in the point number B. The positive electrode of the odd capacitance is 39 / 40 in the point number A, and the positive electrode of the even capacitance is 41 / 42 in the point number A. The specific information is shown in Table 1.

[0042] Table 1 The installation positions of the double-point liquid level sensors are checked. (1) For the double-point liquid level sensor, alcohol is dripped at the I point of the double-point liquid level sensor (close to the lower bottom side), and after testing, it is found that the capacitances of the points 23 and 24 change, and the capacitances of the points 25 and 26 do not change.

[0043] (2) After the alcohol evaporates, alcohol is dripped at the II point of the double-point liquid level sensor (close to the upper bottom side), and the capacitances of the points 25 and 26 change, and the capacitances of the points 23 and 24 do not change.

[0044] (3) According to the above data, after alcohol is dripped, the capacitance values of the double-point liquid level sensor in the tank obviously increase, and the capacitances of the two points do not affect each other, which meets the requirements of the polarity test.

[0045] The installation positions of the single-point liquid level sensors are checked. (4) Alcohol is dripped at the III point of the point-type liquid level sensor (close to the lower end side of the point-type sensor), and the capacitances of the points 27 and 28 of the point-type liquid level sensor III change, and the capacitances of the points 29 and 30 of the point-type liquid level sensor IV do not change.

[0046] (5) After the alcohol evaporates, alcohol is dripped at the IV point of the point-type liquid level sensor (close to the upper end side of the point-type sensor), and the capacitances of the points 29 and 30 of the point-type liquid level sensor IV change, and the capacitances of the points 27 and 28 of the point-type liquid level sensor III do not change.

[0047] (6) From the above data, the two point liquid level sensors in the tank show a significant increase in capacitance value after the alcohol is dropped, and the two point liquid level sensors do not affect each other, meeting the polarity test requirements. The detection method of the depleted shutdown liquid level sensor is similar to that of the point liquid level sensor.

[0048] Check the installation position of the continuous liquid level sensor: (7) In the upper bottom continuous liquid level sensor, close to the lower bottom position, after the alcohol is dropped, the odd capacitance (39 / 40 vs. 43 / 44) changes, and the even capacitance (41 / 42 vs. 43 / 44) does not change.

[0049] (8) After the alcohol evaporates, drop alcohol into the upper bottom continuous liquid level sensor close to the upper bottom position, the even capacitance (41 / 42 vs. 43 / 44) changes, and the odd capacitance (39 / 40 vs. 43 / 44) does not change.

[0050] Finally, the installation position of the sensor with no obvious change in capacitance value is fine-tuned to make the position of the sensing part more accurate, and after adding alcohol again, the capacitance value changes significantly. Record the inspection results of the five sensors to confirm that all sensor installation positions are correct.

[0051] The application also provides a checking system for the installation position of a liquid level sensor in a rocket tank, comprising a dropping device, a detection device and a controller.

[0052] The dropping device is used to drop a detection reagent into the preset installation position of the liquid level sensor; the detection device is used to detect the initial capacitance of the liquid level sensor and the capacitance value change; the controller is used to determine the predetermined installation position of the liquid level sensor in the tank according to the design drawing of the tank, to construct a three-dimensional model of the tank according to the predetermined installation position of the liquid level sensor in the tank, and to determine the preset installation position of each liquid level sensor in the three-dimensional model of the tank, and to determine whether the installation position of each liquid level sensor is correct according to the capacitance value change.

[0053] Specifically, the dropping device can adopt a six-axis robot, which clamps an alcohol bottle at the end, tilts the alcohol bottle at the preset installation position, and drops alcohol. The detection device uses a detection circuit to detect the change of the capacitance.

[0054] The checking method and device for the installation position of a liquid level sensor in a rocket tank provided by the application use the principle that the dielectric constant of the detection reagent is different from that of air to test whether the capacitance changes, use appropriate detection reagents, and can sensitively detect the small deviation of the sensor installation position through the capacitance value change, improve the checking accuracy, are less affected by human factors, and have reliable checking results; the method is simple to operate, does not require complex equipment, can quickly complete the checking of a large number of sensors, and improves the efficiency.

[0055] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0056] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for checking the installation position of a liquid level sensor inside a rocket propellant tank, characterized in that, include: Based on the design drawings of the storage tank, determine the predetermined installation positions of the liquid level sensors in the storage tank, construct a three-dimensional model of the storage tank based on the predetermined installation positions of the liquid level sensors in the storage tank, and determine the predetermined installation positions of each liquid level sensor in the three-dimensional model of the storage tank. Connect a bridge circuit to each liquid level sensor and measure the initial capacitance; Add detection reagents to the preset installation positions of each liquid level sensor and obtain the changes in capacitance values; Based on the changes in capacitance values, determine whether the installation positions of each liquid level sensor are correct.

2. The method for checking the installation position of the liquid level sensor inside the rocket propellant tank according to claim 1, characterized in that, The liquid level sensors include continuous liquid level sensors, single-point liquid level sensors, dual-point liquid level sensors, and depletion-shutdown liquid level sensors; determining the preset installation positions of each liquid level sensor in the three-dimensional model of the tank specifically includes: Based on the location and type of the liquid level sensor, determine the preset installation positions of the first continuous liquid level sensor, single-point liquid level sensor and dual-point liquid level sensor located on the top bottom of the tank in the three-dimensional model, and determine the preset installation positions of the depletion shutdown liquid level sensor and the second continuous liquid level sensor located on the bottom bottom of the tank in the three-dimensional model.

3. The method for checking the installation position of the liquid level sensor inside the rocket propellant tank according to claim 1, characterized in that, The step of determining whether the installation position of each liquid level sensor is correct based on the change in capacitance value specifically includes: Set a threshold for capacitance change; Based on the relationship between the change in capacitance value of the liquid level sensor and the capacitance change threshold, determine whether the installation position of the liquid level sensor is correct.

4. The method for checking the installation position of the liquid level sensor inside the rocket propellant tank according to claim 3, characterized in that, The step of determining whether the installation position of the liquid level sensor is correct based on the relationship between the change in capacitance value of the liquid level sensor and the capacitance change threshold specifically includes: If the change in capacitance of the liquid level sensor is less than or equal to the capacitance change threshold, it is determined that the installation position of the liquid level sensor is incorrect. If the change in capacitance of the liquid level sensor is greater than the capacitance change threshold, the installation position of the liquid level sensor is determined to be correct.

5. The method for checking the installation position of the liquid level sensor inside the rocket propellant tank according to claim 4, characterized in that, The step of determining whether the installation position of the liquid level sensor is correct based on the relationship between the change in capacitance value of the liquid level sensor and the capacitance change threshold specifically includes: If the capacitance change of a detected liquid level sensor is greater than the capacitance change threshold, and at least one undetected liquid level sensor also has a capacitance change greater than the capacitance change threshold, then it is determined that at least one of the liquid level sensors whose capacitance change is greater than the capacitance change threshold is incorrectly installed.

6. The method for checking the installation position of the liquid level sensor inside the rocket propellant tank according to claim 4 or 5, characterized in that, After determining that the liquid level sensor is installed in an incorrect location, the process also includes: Adjust the installation position of the liquid level sensor, add the detection reagent to the adjusted installation position, and obtain the current capacitance value change until the capacitance value change of the liquid level sensor is greater than the capacitance change threshold.

7. The method for checking the installation position of the liquid level sensor inside the rocket propellant tank according to claim 2, characterized in that, The installation position detection method for a dual-point liquid level sensor specifically includes: A detection reagent was added to the first point of the dual-point liquid level sensor, and the changes in capacitance values ​​at the first and second points were obtained. A detection reagent is added to the second point of the dual-point liquid level sensor, and the changes in capacitance values ​​at the first and second points are obtained. Based on the changes in capacitance values ​​at the first and second points during the two tests, determine whether the installation position of the dual-point liquid level sensor is correct.

8. The method for checking the installation position of the liquid level sensor inside the rocket propellant tank according to claim 2, characterized in that, The method for detecting the installation position of multiple point-type liquid level sensors specifically includes: A detection reagent is added to one of the point level sensors, and the changes in capacitance values ​​of the point level sensor with the detection reagent added and the point level sensor without the detection reagent added are obtained. Based on the changes in capacitance values ​​of the point-type liquid level sensor with and without added reagent, determine whether the installation position of the point-type liquid level sensor is correct.

9. The method for checking the installation position of the liquid level sensor inside the rocket propellant tank according to claim 2, characterized in that, The specific methods for detecting the installation position of a continuous liquid level sensor include: A detection reagent was added to one end of the continuous liquid level sensor, and the changes in the capacitance values ​​of the odd and even capacitances of the continuous liquid level sensor were obtained. Add a detection reagent to the other end of the continuous liquid level sensor and obtain the changes in the capacitance values ​​of the odd and even capacitances of the continuous liquid level sensor. Based on the changes in the odd and even capacitance values ​​of the continuous liquid level sensor, determine whether the installation position of the continuous liquid level sensor is correct.

10. A system for checking the installation position of a liquid level sensor inside a rocket propellant tank, characterized in that, include: A dripping device is used to drip detection reagents onto a preset installation position of the liquid level sensor; A detection device is used to detect the initial capacitance of the liquid level sensor and the change in its capacitance value. The controller is used to determine the predetermined installation positions of the liquid level sensors in the tank according to the tank design drawings, construct a three-dimensional model of the tank based on the predetermined installation positions of the liquid level sensors, determine the preset installation positions of each liquid level sensor in the three-dimensional model of the tank, and also determine whether the installation positions of each liquid level sensor are correct based on the changes in capacitance value.

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