CN112945458B - Automatic test system, method and device for pressure gauge - Google Patents
Automatic test system, method and device for pressure gauge Download PDFInfo
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Abstract
The invention discloses an automatic test system, method and device for a pressure gauge, and relates to the technical field of instrument and meter testing. The system comprises a rotating mechanism, a data acquisition mechanism and a data processing mechanism; the rotating mechanism is provided with a tested equipment mounting part, a linear guide rail, a sliding block and a piston, the piston comprises a piston cavity and a piston rod, the piston cavity is positioned between the tested equipment mounting part and the sliding block, the sliding block drives the piston rod to move when moving on the linear guide rail, the gas pressure in the piston cavity is changed and acts on a tested pressure gauge through a gas pressure channel, and a measured pressure value is obtained through the tested pressure gauge; the data acquisition mechanism comprises an atmospheric pressure sensor, an electronic temperature measurement structure and an electronic distance measurement structure, and the data processing mechanism receives information detected by the data acquisition mechanism and calculates a theoretical pressure value and then compares the theoretical pressure value with a measured pressure value. The invention does not depend on the precision of a reference pressure gauge, has high detection efficiency and wide pressure test range, and the precision of the generated reference pressure is irrelevant to the test range.
Description
Technical Field
The invention relates to the technical field of instrument and meter testing, in particular to an automatic testing system, method and device for a pressure gauge.
Background
Pressure gauges (such as common elastic element type general pressure gauge, pressure vacuum gauge and vacuum gauge) are the most commonly used gauges in various types of gauges, and must be calibrated frequently in order to ensure high reliability of the pressure gauge in use. These calibration tasks must comply with relevant national or international standards, according to the specific requirements commonly used for each different application. The test items of the pressure gauge can generally comprise test items such as zero point error detection, indicating value error detection, return stroke error detection and slight displacement detection.
The traditional pressure gauge testing scheme generally adopts a manual pressurization method, and the values between the tested pressure gauge and the reference pressure gauge are compared at a plurality of calibration points for calibration and calibration, so that the testing efficiency and the accuracy are lower. Taking an aircraft pressure gauge (also called a pressure indicator or a pressure gauge) as an example, since the stability and accuracy of the pressure gauge are directly related to the normal operation of the aircraft, frequent detection is needed to ensure the stability and accuracy of the performance of the pressure gauge. The existing detection equipment is usually pressurized by manually operating a hydraulic pump or an air pump, so that on one hand, overpressure is easily caused, and instruments are damaged; on the other hand, the constant voltage is difficult to dynamically protect, the precision is poor, intelligent judgment and recording cannot be performed, and the efficiency is low.
At present, some testing devices for assisting a metrologist in performing a pressure gauge test are also provided in the prior art, and take a chinese patent z12017208600722 as an example, which discloses a pressure calibration device: the pressure calibration device comprises a pressure calibration unit and a main control unit electrically connected with the pressure calibration unit, wherein the pressure calibration unit is externally connected with a calibrated pressure instrument, and is also integrated with a communication module which is electrically connected to the main control unit and is accessed into a remote database through a network; the pressure calibration unit comprises a pressure generation unit, a pressure control module, a pressure measurement module and a pressure interface module which are communicated through a gas pipeline, and the pressure measurement module and the pressure control module are respectively and electrically connected to the main control unit; the pressure interface module is externally connected with a pressure instrument to be calibrated, the pressure measurement module provides pressure standard data, and high-pressure gas generated by the pressure generation unit enters the pressure control module through a gas pipeline and reaches the pressure instrument to be calibrated through the pressure interface module; specifically, the pressure generating unit generates gas pressure by an air pump. However, in the above calibration scheme, a pressure measurement module including a standard meter needs to be arranged to provide pressure standard data, the accuracy of the test is highly dependent on the accuracy of the standard meter (or referred to as a reference pressure meter), and if the accuracy of the standard meter is defective, the calibrated pressure meter may be inaccurate; meanwhile, the standard meters with different measuring ranges are required to be replaced during testing to calibrate the pressure gauge to be tested with the corresponding measuring ranges, so that the testing efficiency is reduced.
In summary, it is a technical problem in the art to solve urgently how to provide an automatic testing system for a pressure gauge, which does not rely on reference to the accuracy of the pressure gauge, has high detection efficiency, a wide pressure testing range and a high degree of automation.
Disclosure of Invention
The invention aims to: the defects of the prior art are overcome, and the automatic test system, the method and the device of the pressure gauge are provided. According to the automatic testing system provided by the invention, the piston is pulled through the sliding block, pressure parameters are converted into physical parameters such as displacement, temperature and the like which are easy to measure with high accuracy, theoretical pressure applied to a measured pressure gauge is indirectly calculated through an ideal gas formula to serve as reference pressure, and measurement errors are obtained through comparison between the reference pressure and the measured pressure of the measured pressure gauge. The invention does not need to arrange a reference pressure gauge, has high detection efficiency, and has the advantages of wide pressure test range, independence of the generated reference pressure precision and the test range and high automation degree.
In order to achieve the above object, the present invention provides the following technical solutions:
an automatic test system of a pressure gauge comprises a rotating mechanism, a data acquisition mechanism and a data processing mechanism;
the rotating mechanism is provided with a tested equipment mounting part, a linear guide rail, a sliding block and a piston; the tested equipment mounting part is used for fixedly mounting the tested pressure gauge on the rotating mechanism; the linear guide rail is fixedly arranged on the rotating mechanism and arranged along the radius direction of the rotating mechanism, and the sliding block is movably arranged on the linear guide rail and can move on the linear guide rail along the radius direction of the rotating mechanism; the piston includes piston chamber and piston rod, piston chamber fixed mounting just is located between test equipment installation department and the slider on rotary mechanism, the piston chamber passes through the pipe and is connected formation atmospheric pressure passageway with the manometer that examines, piston rod rigid connection is to the slider on, and the slider drives when moving on linear guide the piston rod motion, the gas pressure in the piston chamber changes and is used in examining the manometer through aforementioned atmospheric pressure passageway, obtains measurement pressure value P through examining the manometer and surveys pressure value Pe；
The data acquisition mechanism comprises an atmospheric pressure sensor, an electronic temperature measurement structure and an electronic distance measurement structure, wherein the atmospheric pressure sensor is used for detecting atmospheric pressure information, the electronic temperature measurement structure is arranged corresponding to the piston and used for detecting temperature information in the piston cavity, and the electronic distance measurement structure is arranged corresponding to the piston or the sliding block and used for detecting length information of gas in the piston;
the data processing mechanism can receive the information detected by the data acquisition mechanism and obtain the initial atmospheric pressure P at the beginning of the test according to the detected information0Initial temperature T in the piston0And an initial length L of gas in the piston0And obtaining the temperature change quantity delta t in the piston and the gas length change quantity delta L in the piston in the test process, calculating and obtaining a theoretical pressure value delta P through the following formula,
receiving the measurement information of the pressure gauge to be measured, and comparing the theoretical pressure value delta P with the measurement pressure value PeAnd comparing to obtain the measurement error of the measured pressure gauge.
Furthermore, the conduit is a hose, a gas output port is arranged in the piston cavity corresponding to the piston, and one end of the hose is connected with the gas output port through an air tap; the other end of the hose is arranged corresponding to the installation part of the tested equipment and is used for connecting a gas input port of the tested pressure gauge during testing.
Further, the electronic distance measuring structure comprises a distance sensor in communication connection with the data processing mechanism, the distance sensor is arranged corresponding to the piston rod to collect the position change quantity of the piston rod, and the position change quantity of the piston rod is sent to the data processing mechanism to be used as the length change quantity delta L of the gas in the piston; or the distance sensor is arranged at one end of the linear guide rail corresponding to the outer side of the sliding block, and the distance sensor acquires the position change quantity of the sliding block when the rotating mechanism rotates and sends the position change quantity to the data processing mechanism as the length change quantity delta L of the gas in the piston.
Further, the electronic distance measuring structure comprises a camera, an image processor and a wireless communication structure; the camera is arranged corresponding to the piston or the sliding block and is used for shooting image data of the piston or the sliding block and sending the image data to the image processor; the image processor is used for carrying out image recognition on the received image data of the piston or the slide block so as to acquire position change information of the piston rod or the slide block; the change in the position of the piston rod is transmitted to the data processing mechanism as a change in the gas length in the piston Δ L or the change in the position of the slider is transmitted to the data processing mechanism as a change in the gas length in the piston Δ L through the wireless communication structure.
Furthermore, the electronic temperature measuring structure comprises a temperature sensor arranged corresponding to the piston cavity, temperature information in the piston cavity is collected through the temperature sensor and sent to the data processing mechanism, and the collected temperature information comprises initial temperature information in the piston when the test is started and change information of the temperature in the piston during the test process.
Furthermore, a rotating speed measuring unit and a rotating speed control unit are arranged corresponding to the rotating mechanism, the data acquisition mechanism comprises a test information acquisition unit for acquiring a plurality of pieces of test rotating speed information set by a user, and the rotating speed control unit can automatically adjust the rotating speed of the rotating mechanism to the next test rotating speed after one rotating speed test is finished according to the test rotating speed information until the preset number of calibration points and/or stroke requirements are met;
the rotating speed measuring unit is used for measuring the rotating speed of the rotating mechanism and sending a comparison instruction when the rotating speed is fixed, and according to the comparison instruction, the data processing mechanism is triggered to obtain a theoretical pressure value delta P and then the theoretical pressure value delta P and a measured pressure value PeAnd (6) carrying out comparison.
The invention also provides a test method according to the automatic test system, which comprises the following steps:
fixedly mounting the tested pressure gauge on the rotating mechanism through the mounting part of the tested equipment;
acquiring test rotation speed information, controlling the rotation of the rotating mechanism according to the test rotation speed information, and obtaining a measurement pressure value P through a pressure gauge to be tested when the rotating mechanism reaches a test rotation speed and the rotation speed is constanteMeanwhile, obtaining the temperature change quantity delta t in the piston and the gas length change quantity delta L in the piston in the test process through the electronic temperature measurement structure and the electronic distance measurement structure;
combining the initial atmospheric pressure P at the beginning of the test according to the temperature change delta t in the piston and the length change delta L of the gas in the piston0Initial temperature T in the piston0And the initial length L of gas in the piston0The theoretical pressure value deltap is calculated by the following formula,
comparing the theoretical pressure value Δ P with the measured pressure value PeAnd comparing to obtain the measurement error of the pressure gauge to be measured at the test rotating speed.
Furthermore, a rotating speed measuring unit and a rotating speed control unit are arranged on the rotating mechanism, the data acquisition mechanism comprises a test information acquisition unit for acquiring a plurality of pieces of test rotating speed information set by a user, and the rotating speed control unit can automatically adjust the rotating speed of the rotating mechanism to the next test rotating speed after one rotating speed test is finished according to the test rotating speed information until the preset number of calibration points and/or stroke requirements are met;
the rotating speed measuring unit is used for measuring the rotating speed of the rotating mechanism and sending a comparison instruction when the rotating speed is fixed, and according to the comparison instruction, the data processing mechanism is triggered to obtain a theoretical pressure value delta P and then the theoretical pressure value delta P and a measured pressure value PeAnd (6) carrying out comparison.
The invention also provides an intelligent pressure device for testing the pressure gauge, which comprises a rotating mechanism, wherein the rotating mechanism is provided with a tested equipment mounting part, a linear guide rail, a sliding block and a piston;
the tested equipment mounting part is used for fixedly mounting the tested pressure gauge on the rotating mechanism;
the linear guide rail is fixedly arranged on the rotating mechanism and arranged along the radius direction of the rotating mechanism, and the sliding block is movably arranged on the linear guide rail and can move on the linear guide rail along the radius direction of the rotating mechanism;
the piston includes piston chamber and piston rod, piston chamber fixed mounting just is located between test equipment installation department and the slider on rotary mechanism, the piston chamber passes through the pipe and is connected with the manometer that receives the test and form the atmospheric pressure passageway, piston rod rigid connection is to the slider on, and the slider drives when moving on linear guide the piston rod motion, the gas pressure in the piston chamber changes and acts on receiving on the manometer through aforementioned atmospheric pressure passageway.
Furthermore, the movement distance of the sliding block on the linear guide rail is adjusted by adjusting the rotating speed of the rotating mechanism, so that the air pressure acting on the pressure gauge to be measured is adjusted.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects as examples: according to the automatic test system of the pressure gauge, the piston is pulled through the sliding block, pressure parameters are converted into physical parameters such as displacement and temperature which are easy to measure with high accuracy, theoretical pressure applied to the measured pressure gauge is indirectly calculated through an ideal gas formula and serves as reference pressure, and measurement errors are obtained through comparison between the reference pressure and the measured pressure of the measured pressure gauge. The invention is suitable for the decompression test of the pressure gauge, does not need to set a reference pressure gauge (so that the calibration does not depend on the precision of the reference pressure gauge), has high detection efficiency, and has the advantages of wide pressure test range, irrelevance of the precision of the generated reference pressure to the test range and high automation degree. Simultaneously, owing to need not to set up reference pressure table, calibration point quantity can set up more as required.
Drawings
Fig. 1 is a diagram illustrating an exemplary structure of an automated testing system for a pressure gauge according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the piston initially in an unstretched state according to the embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a piston in a stretching state during rotation according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of information acquisition and transmission of the system according to the embodiment of the present invention.
Fig. 5 is a schematic diagram of information processing for performing rotation speed control and rotation speed measurement according to an embodiment of the present invention.
Description of reference numerals:
a system 10;
a rotating mechanism 100, a rotating center 101, a tested equipment mounting part 110, a linear guide rail 120, a sliding block 130, a piston 140, a piston cavity 141, a piston rod 142, gas 143 in the piston, and a conduit 150;
the system comprises a data acquisition mechanism 200, an atmospheric pressure sensor 210, an electronic temperature measurement structure 220 and an electronic distance measurement structure 230;
a data processing mechanism 300;
the pressure gauge 20 is measured.
Detailed Description
The automatic testing system, method and device for pressure gauges disclosed in the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects. In the drawings of the embodiments described below, the same reference numerals appearing in the respective drawings denote the same features or components, and may be applied to different embodiments. Thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
It should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the invention, which is defined by the claims, and any modifications of the structures, changes in the proportions and adjustments of the sizes and other dimensions, should be construed as falling within the scope of the invention unless the function and objectives of the invention are affected. The scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed out of order from that described or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
Examples
Referring to fig. 1, the present invention provides an automatic testing system for a pressure gauge.
The system 10 includes a rotation mechanism 100, a data acquisition mechanism 200, and a data processing mechanism 300.
The rotating mechanism 100 is capable of rotating about a center of rotation 101 under the drive of a rotational drive device, such as a motor. The rotating mechanism 100 is provided with a device under test mounting portion 110, a linear guide 120, a slider 130, and a piston 140, and fig. 1 illustrates a plan view of the rotating mechanism 100.
The device under test mounting portion 110 is used to fixedly mount the pressure gauge 20 under test on the rotation mechanism 100. The pressure gauge 20 under test is the subject of the test as the equipment under test. The fixed connection manner of the pressure gauge 20 to be tested on the rotating mechanism 100 includes, but is not limited to, a threaded connection, a snap connection, a clamping connection or a combination of multiple connection manners, and the connection manner may be applied to the device under test mounting portion 110 as long as the pressure gauge 20 to be tested can be fixed on the rotating mechanism 100.
The linear guide 120 is fixedly installed on the rotating mechanism and arranged along the radius direction of the rotating mechanism, and the slider 130 is movably installed on the linear guide 120. The linear guide 120 is used to limit the moving range of the slider 130 to make a linear motion in a radial direction. When the rotating mechanism 100 rotates, the slider 130 may move outward on the linear guide 120 in a radial direction of the rotating mechanism under centrifugal force. When the rotation mechanism 100 stops rotating, the slider is no longer subjected to centrifugal force, and the slider 130 can move inward on the linear guide 120 in the radial direction of the rotation mechanism to return to the initial position.
In this embodiment, the sliding block 130 may be a heavy object, and the movable mounting manner of the sliding block and the linear guide may be based on a matching groove or protrusion structure. For example, and not by way of limitation, the upper surface of the linear guide rail is provided with an inverted T-shaped groove (the cross section of the groove is inverted T-shaped), and the bottom of the slider 130 is provided with a T-shaped protrusion matching with the aforementioned groove, so that the slider can make a linear motion on the linear guide rail and avoid the slider from being separated from the guide rail.
The piston 140 is located inside the slider 130, i.e., the piston 140 is located between the device under test mounting portion 110 and the slider 130.
Specifically, referring to fig. 2, the piston 140 includes a piston chamber 141 (or cylinder) and a piston rod 142. The piston cavity 141 is fixedly arranged on the rotating mechanism 100 and is positioned between the tested equipment mounting part 110 and the sliding block 130, and the pistonThe chamber 141 is connected to the pressure gauge 20 to be measured through a pipe 150 to form a gas pressure passage, and the gas pressure in the piston chamber 141 can be applied to the pressure gauge 20 to be measured through the gas pressure passage. The piston rod 142 is rigidly connected to the sliding block, the sliding block drives the piston rod to move when moving on the linear guide rail, the gas pressure in the piston cavity is changed and acts on the pressure gauge to be tested through the gas pressure channel, and the pressure value P to be measured is obtained through the pressure gauge to be testede。
In specific implementation, the piston cavity 141 is a shell structure having a cavity, gas 143 in the piston is in the cavity, and the sectional area of the piston cavity is a constant value, that is, the sectional area is the same everywhere. One end of the piston rod 142 may have an enlarged head portion, and the enlarged head portion of the piston rod 142 is in sealing contact with an inner wall of the piston chamber 141 and can reciprocate within the piston chamber 141. Preferably, the enlarged head of the piston rod 142 is provided with a plurality of piston seals to improve the tightness of the contact of the enlarged head of the piston rod with the piston chamber. The other end of the piston rod 142 is rigidly connected to the slider 130, so that the slider 130 can pull the piston rod 142 to move together when moving outwards, thereby changing the gas pressure (pressure decrease) in the piston cavity, generating negative pressure on the pressure gauge 20 to be measured through the gas pressure channel, measuring the pressure of the pressure gauge to obtain a measured pressure value Pe。
The conduit 150 is preferably a hose, a gas outlet is provided corresponding to the piston cavity 141 of the piston, and one end of the hose can be connected to the gas outlet through a gas nozzle; the other end of the hose is arranged corresponding to the installation part of the tested equipment and can be connected with a gas input port of the tested pressure gauge during testing.
After receiving the test instruction, the rotating mechanism starts to rotate, the slider moves outwards along the radial direction (the movement direction indicated by the arrow in fig. 2) under the limit of the linear guide rail due to the action of centrifugal force, and simultaneously pulls the piston rod, so that the pressure of the gas in the piston cavity changes, as shown in fig. 3. The air pressure change is acted on the tested pressure gauge through the air pressure channel to generate pressure intensity for the tested pressure gauge, and the pressure intensity is related to the displacement of the piston (or the displacement of the slide block) and parameters such as current temperature information, air pressure information and the like.
According to the ideal gas state equation, there are:
PV＝nRT
wherein P is gas pressure, V is gas volume, n is the mole number of the gas, R is the universal gas constant of the gas, and T is gas temperature.
The cross-sectional area of the piston cavity in the piston is the same everywhere, so the air volume inside the piston can be calculated by the following formula:
V＝LS
wherein L is the length of the gas in the piston and S is the sectional area of the piston. In this case, the ideal gas state equation translates into:
since the mass of air in the piston is substantially unchanged, i.e., the number of moles is substantially unchanged, the parameters n, R and S in the above formula can be considered as constants, such that:
the following equation can be obtained:
PL＝KT
assume that in the initial state (before the start of the test), the initial atmospheric pressure is P0Initial temperature in the piston is T0The initial length of the gas in the piston is L0Substituting the formula to obtain a formula:
P0L0＝KT0
after the test begins, control rotary mechanism rotation, when rotary mechanism reaches preset constant rotational speed, because the slider (heavy object piece) receives centrifugal force effect pulling piston, has changed the gas volume (the volume increase) in the piston, has the following relational expression at this moment:
(P0+ΔP)(L0+ΔL)＝K(T0+Δt)
wherein, the delta P is the variation of the gas pressure in the piston; Δ L is the change in the length of the gas in the piston, embodied as the change in the position of the piston or the change in the position of the slider; Δ t is the amount of change in temperature in the piston.
The change amount Δ P of the gas pressure in the piston is the pressure value (pressure) acting on the measured pressure gauge, and the calculation formula of Δ P is as follows:
that is, after obtaining the temperature change Δ t in the piston and the gas length change Δ L in the piston during the test, the initial atmospheric pressure P at the start of the test can be combined0Initial temperature T in the piston0And the initial length L of gas in the piston0And (5) the parameters are equal, and the theoretical pressure value delta P of the measured pressure gauge is obtained through calculation by the formula.
Accordingly, the system provided by the present embodiment further includes a data acquisition mechanism 200 and a data processing mechanism 300.
The data acquisition mechanism 200 comprises an atmospheric pressure sensor 210, an electronic temperature measurement structure 220 and an electronic distance measurement structure 230. The atmospheric pressure sensor 210 is used to detect atmospheric pressure information. The electronic temperature measuring structure 220 is disposed corresponding to the piston and used for detecting temperature information in the piston cavity. The electronic distance measuring structure 230 is disposed corresponding to the piston or the slider for detecting the length information of the gas in the piston.
The data processing mechanism 300 can receive the information detected by the data acquisition mechanism and obtain the initial atmospheric pressure P at the beginning of the test according to the detected information0Initial temperature T in the piston0And the initial length L of gas in the piston0And obtaining the temperature change quantity delta t in the piston and the gas length change quantity delta L in the piston in the test process, and calculating and obtaining a theoretical pressure value delta P through the following formula:
the numberThe processing unit 300 can also receive the measurement information of the pressure gauge to be measured, and compare the theoretical pressure value Δ P with the measured pressure value PeAnd comparing to obtain the measurement error of the measured pressure gauge.
In this embodiment, the data processing mechanism may be integrated with the rotating mechanism, or may be independently disposed on the upper computer.
When the upper computer is adopted to set the data processing mechanism, preferably, the detected pressure gauge and the data acquisition mechanism transmit the detected data to the upper computer in a wireless data transmission mode, and the data processing mechanism on the upper computer performs data storage and data processing after receiving the data, which is shown in fig. 4. Preferably, a wireless transmission device is integrated on the rotating mechanism so as to transmit the detected displacement information, the temperature information of the gas in the piston, the rotating speed information of the rotating mechanism and other detection data to the data processing mechanism.
In one embodiment, the electronic ranging structure may include a range sensor communicatively coupled to the data processing mechanism.
In specific implementation, the distance sensor may be disposed corresponding to the piston rod to acquire a position change of the piston rod, and send the position change of the piston rod to the data processing mechanism as a length change Δ L of the gas in the piston.
Or, the distance sensor can also be arranged at one end of the linear guide rail corresponding to the outer side of the sliding block, and the distance sensor acquires the position change of the sliding block when the rotating mechanism rotates and sends the position change to the data processing mechanism as the length change delta L of the gas in the piston.
In another embodiment, the electronic ranging structure may also employ image recognition means. Specifically, the electronic distance measuring structure comprises a camera, an image processor and a wireless communication structure; the camera is arranged corresponding to the piston or the sliding block and is used for shooting image data of the piston or the sliding block and sending the image data to the image processor; the image processor is used for carrying out image recognition on the received image data of the piston or the slide block so as to acquire position change information of the piston rod or the slide block; the change in the position of the piston rod is transmitted to the data processing mechanism as a change in the gas length in the piston Δ L or the change in the position of the slider is transmitted to the data processing mechanism as a change in the gas length in the piston Δ L through the wireless communication structure.
In this embodiment, the electronic temperature measuring structure preferably employs a temperature sensor, and optionally, the temperature sensor is integrated on the piston. Specifically, the electronic temperature measuring structure can comprise a temperature sensor arranged corresponding to the piston cavity, the temperature sensor collects temperature information in the piston cavity and sends the temperature information to the data processing mechanism, and the collected temperature information can comprise initial temperature information in the piston when the test is started and change information of the temperature in the piston in the test process.
Referring to fig. 5, preferably, a rotation speed measuring unit and a rotation speed control unit are further provided corresponding to the rotating mechanism. When the device is specifically arranged, the rotating speed measuring unit can be integrated into the rotating mechanism for arrangement, and the rotating speed control unit can be integrated into the data processing mechanism for arrangement.
The data acquisition mechanism further comprises a test information acquisition unit for acquiring a plurality of test rotating speed information set by a user. As an example and not by way of limitation, for example, a user interface is set in the upper computer as a test information acquisition unit for a user to directly input a plurality of required test rotation speed information, or a file for setting the test rotation speed information under a preset storage path is read through the user interface, or a test rotation speed setting file imported by the user is received through the user interface.
During testing, the rotating speed control unit can automatically adjust the rotating speed of the rotating mechanism to the next testing rotating speed after one rotating speed test is finished according to the testing rotating speed information until all testing rotating speeds are finished, and the preset calibration point number and/or stroke requirement is met.
The rotating speed measuring unit is used for measuring the rotating speed of the rotating mechanism and sending a comparison instruction when the rotating speed is fixed. According to the comparison instruction, the test system can trigger the data processing mechanism to process data, and after the theoretical pressure value delta P is obtained, the theoretical pressure value delta P and the measured pressure value P are comparedeComparing to obtain the measured valueMeasurement error of the pressure gauge.
Through the cooperation of the rotating speed control unit and the rotating speed measuring unit, the test system can automatically complete the error measurement of the tested pressure gauge at a plurality of test rotating speeds until the preset calibration point number and stroke requirements are met.
According to the technical scheme provided by the invention, the piston is pulled by the sliding block, the pressure is converted into physical quantities such as displacement, temperature and the like which are easy to measure with high precision, the reference pressure applied to the measured pressure gauge is indirectly calculated, the pressure value applied to the measured pressure gauge can be conveniently and accurately controlled by controlling the rotating speed of the rotating mechanism, the problems that the calibration in the prior art is highly dependent on the precision of the reference pressure gauge, the detection efficiency is low, the number of calibration points is small are solved, and the pressure measuring device has the advantages of wide pressure measuring range, independence of the generated reference pressure precision and the measuring range and high automation degree.
In the above technical solution, the pressure gauge to be measured is a measured and calculated main body, the electronic distance measuring device, such as the distance sensor, is used for measuring the displacement of the piston or the slider along the radius, the piston is used for converting the displacement of the slider into the reference pressure applied to the pressure gauge to be measured, the guide rail is used for limiting the sliding movement range, the guide pipe is used for connecting the pressure gauge to be measured and the piston to form an air pressure channel, the electronic temperature measuring structure, such as the temperature sensor, is used for detecting temperature information, and the atmospheric pressure sensor is used for measuring atmospheric pressure. The data acquisition structure is used for collecting the detection data of each sensor and sending the detection data to the data processing mechanism for data processing in a wireless data transmission mode. The data processing mechanism is configured to: and calculating a theoretical pressure value according to a preset theoretical pressure calculation model, and comparing the theoretical pressure value with a measurement pressure value detected by the measured pressure gauge. Further, the data processing mechanism may be further configured to: and acquiring the stored detection data and calculating and comparing the data, and performing error analysis and calibration.
The typical steps of testing with the automatic test system of the pressure gauge may be as follows:
and S100, fixedly mounting the pressure gauge to be tested on the rotating mechanism through the mounting part of the tested equipment.
S200, obtaining test rotating speed information, controlling the rotating mechanism to rotate according to the test rotating speed information, and obtaining a measured pressure value P through the tested pressure gauge when the rotating mechanism reaches the test rotating speed and the rotating speed is constanteMeanwhile, the temperature change quantity delta t in the piston and the gas length change quantity delta L in the piston in the test process are obtained through the electronic temperature measurement structure and the electronic distance measurement structure.
S300, combining the initial atmospheric pressure P at the beginning of the test according to the temperature change delta t in the piston and the gas length change delta L in the piston0Internal initial temperature T of piston0And an initial length L of gas in the piston0The theoretical pressure value deltap is calculated by the following formula,
s400, comparing the theoretical pressure value delta P with the measured pressure value PeAnd comparing to obtain the measurement error of the pressure gauge to be measured at the test rotating speed.
The present embodiment will be described in detail below with reference to calibrating a pressure gauge having a range of-10 KPa-0 Pa.
Step 1, connecting a gas pressure measuring input port of a pressure gauge to an air tap of an output port of a piston through a hose, and placing the pressure gauge on a tested equipment mounting part of a rotating mechanism for fixing. The measurement output of the pressure gauge is connected to a wireless data transmission device through a wire.
Step 2, reading initial atmospheric pressure P through an air pressure sensor before calibration begins0101325Pa, reading the current piston temperature T by thermometer0280K, the initial length L of the piston is obtained through a distance measuring structure015cm (i.e. the length of gas in the piston when the piston is in an unstretched state).
And 3, starting the rotating mechanism.
And 4, gradually increasing the rotating speed of the rotating mechanism to a certain constant rotating speed (controlled according to a preset test rotating speed), obtaining the piston length change quantity delta L of 0.5mm (length increase), and obtaining the piston internal temperature T of 279K, wherein the data are measured by a distance measuring structure and a thermometer and then transmitted to the data processing mechanism through a wireless data transmission device. The measured values of the pressure gauges are also transmitted to the data processing means by means of a wireless data transmission device.
The data processing mechanism substitutes the previous pressure calculation formula with the pressure L being 0.5mm and the pressure t being 279K-280K being-1K based on a preset theoretical pressure calculation model, and the obtained theoretical pressure variation is as follows:
the data storage unit of the data processing mechanism records the numerical value, and the numerical value is compared with the received pressure gauge measured value through the comparison unit to obtain a measurement error.
And 5, adjusting the rotating speed of the rotating mechanism according to the test rotating speed information, and repeating the step 4 until the required calibration point number and stroke requirements are met.
The invention further provides an intelligent pressure applying device for the pressure gauge test.
The intelligent pressing device comprises a rotating mechanism, and a tested equipment installation part, a linear guide rail, a sliding block and a piston are arranged on the rotating mechanism.
The tested equipment installation part is used for fixedly installing the tested pressure gauge on the rotating mechanism.
The linear guide rail is fixedly arranged on the rotating mechanism and arranged along the radius direction of the rotating mechanism, and the sliding block is movably arranged on the linear guide rail and can move on the linear guide rail along the radius direction of the rotating mechanism.
The piston includes piston chamber and piston rod, piston chamber fixed mounting just is located between test equipment installation department and the slider on rotary mechanism, the piston chamber passes through the pipe and is connected with the manometer that receives the test and form the atmospheric pressure passageway, piston rod rigid connection is to the slider on, and the slider drives when moving on linear guide the piston rod motion, the gas pressure in the piston chamber changes and acts on receiving on the manometer through aforementioned atmospheric pressure passageway.
In this embodiment, the intelligent pressure applying device can adjust the movement distance of the sliding block on the linear guide rail by adjusting the rotating speed of the rotating mechanism, so as to adjust the air pressure acting on the pressure gauge to be measured.
Specifically, the intelligent pressure applying device may include a rotation speed measuring unit and a rotation speed control unit. The rotating speed measuring unit is used for measuring the rotating speed of the rotating mechanism. The rotating speed control unit can automatically adjust the rotating speed of the rotating mechanism to the next test rotating speed after one rotating speed test is finished according to the preset test rotating speed information until the preset calibration point number and/or stroke requirement is met.
Other technical features are referred to in the previous embodiments and are not described herein.
In the foregoing description, the disclosure of the present invention is not intended to limit itself to these aspects. Rather, the various components may be selectively and operatively combined in any number within the intended scope of the present disclosure. In addition, terms like "comprising," "including," and "having" should be interpreted as inclusive or open-ended, rather than exclusive or closed-ended, by default, unless explicitly defined to the contrary. All technical, scientific, or other terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. Common terms found in dictionaries should not be interpreted too ideally or too realistically in the context of related art documents unless the present disclosure expressly limits them to that. Any changes and modifications of the present invention based on the above disclosure will be within the scope of the appended claims.
Claims (10)
1. The utility model provides an automatic test system of manometer which characterized in that: the device comprises a rotating mechanism, a data acquisition mechanism and a data processing mechanism;
the rotating mechanism is provided with a tested equipment mounting part, a linear guide rail, a sliding block and a piston; the tested equipment mounting part is used for fixedly mounting the tested pressure gauge on the rotating mechanism; the straight lineThe guide rail is fixedly arranged on the rotating mechanism and arranged along the radius direction of the rotating mechanism, and the sliding block is movably arranged on the linear guide rail and can move on the linear guide rail along the radius direction of the rotating mechanism; the piston includes piston chamber and piston rod, piston chamber fixed mounting just is located between test equipment installation department and the slider on rotary mechanism, the piston chamber passes through the pipe and is connected formation atmospheric pressure passageway with the manometer that examines, piston rod rigid connection is to the slider on, and the slider drives when moving on linear guide the piston rod motion, the gas pressure in the piston chamber changes and is used in examining the manometer through aforementioned atmospheric pressure passageway, obtains measurement pressure value P through examining the manometer and surveys pressure value Pe；
The data acquisition mechanism comprises an atmospheric pressure sensor, an electronic temperature measurement structure and an electronic distance measurement structure, wherein the atmospheric pressure sensor is used for detecting atmospheric pressure information, the electronic temperature measurement structure is arranged corresponding to the piston and used for detecting temperature information in the piston cavity, and the electronic distance measurement structure is arranged corresponding to the piston or the sliding block and used for detecting length information of gas in the piston;
the data processing mechanism can receive the information detected by the data acquisition mechanism and obtain the initial atmospheric pressure P at the beginning of the test according to the detected information0Initial temperature T in the piston0And the initial length L of gas in the piston0And obtaining the temperature change quantity delta t in the piston and the gas length change quantity delta L in the piston in the test process, calculating and obtaining a theoretical pressure value delta P through the following formula,
receiving the measurement information of the pressure gauge to be measured, and comparing the theoretical pressure value delta P with the measurement pressure value PeAnd comparing to obtain the measurement error of the measured pressure gauge.
2. The automated test system of claim 1, wherein: the guide pipe is a hose, a gas output port is arranged in a piston cavity corresponding to the piston, and one end of the hose is connected with the gas output port through an air tap; the other end of the hose is arranged corresponding to the installation part of the tested equipment and is used for connecting a gas input port of the tested pressure gauge during testing.
3. The automated test system of claim 1 or 2, wherein: the electronic distance measuring structure comprises a distance sensor which is in communication connection with the data processing mechanism, the distance sensor is arranged corresponding to the piston rod to acquire the position change quantity of the piston rod, and the position change quantity of the piston rod is sent to the data processing mechanism to be used as the length change quantity delta L of the gas in the piston; or the distance sensor is arranged at one end of the linear guide rail corresponding to the outer side of the sliding block, and the distance sensor acquires the position change quantity of the sliding block when the rotating mechanism rotates and sends the position change quantity to the data processing mechanism as the length change quantity delta L of the gas in the piston.
4. The automated test system of claim 1 or 2, wherein: the electronic distance measuring structure comprises a camera, an image processor and a wireless communication structure; the camera is arranged corresponding to the piston or the sliding block and is used for shooting image data of the piston or the sliding block and sending the image data to the image processor; the image processor is used for carrying out image recognition on the received image data of the piston or the slide block so as to acquire position change information of the piston rod or the slide block; and transmitting the position change quantity of the piston rod to the data processing mechanism through the wireless communication structure as the length change quantity delta L of the gas in the piston, or transmitting the position change quantity of the slide block to the data processing mechanism as the length change quantity delta L of the gas in the piston.
5. The automated test system of claim 1 or 2, wherein: the electronic temperature measuring structure comprises a temperature sensor which is arranged corresponding to the piston cavity, temperature information in the piston cavity is collected through the temperature sensor and sent to the data processing mechanism, and the collected temperature information comprises initial temperature information in the piston when the test is started and change information of the temperature in the piston in the test process.
6. The automated test system of claim 1 or 2, wherein: the data acquisition mechanism comprises a test information acquisition unit for acquiring a plurality of pieces of test rotating speed information set by a user, and the rotating speed control unit can automatically adjust the rotating speed of the rotating mechanism to the next test rotating speed after one rotating speed test is finished according to the test rotating speed information until the preset number of calibration points and/or stroke requirements are met;
the rotating speed measuring unit is used for measuring the rotating speed of the rotating mechanism and sending a comparison instruction when the rotating speed is fixed, and according to the comparison instruction, the data processing mechanism is triggered to obtain a theoretical pressure value delta P and then the theoretical pressure value delta P and a measured pressure value PeAnd (6) carrying out comparison.
7. A method of testing an automated test system according to any one of claims 1 to 6, comprising the steps of:
fixedly mounting the tested pressure gauge on the rotating mechanism through the mounting part of the tested equipment;
acquiring test rotation speed information, controlling the rotation of the rotating mechanism according to the test rotation speed information, and obtaining a measurement pressure value P through a pressure gauge to be tested when the rotating mechanism reaches a test rotation speed and the rotation speed is constanteMeanwhile, obtaining the temperature change quantity delta t in the piston and the gas length change quantity delta L in the piston in the test process through an electronic temperature measurement structure and an electronic distance measurement structure;
combining the initial atmospheric pressure P at the beginning of the test according to the temperature change quantity Deltat in the piston and the gas length change quantity DeltaL in the piston0Initial temperature T in the piston0And the initial length L of gas in the piston0The theoretical pressure value deltap is calculated by the following formula,
comparing the theoretical pressure value DeltaP with the above measurementPressure value PeAnd comparing to obtain the measurement error of the pressure gauge to be measured at the test rotating speed.
8. The test method of claim 7, wherein: the data acquisition mechanism comprises a test information acquisition unit for acquiring a plurality of pieces of test rotating speed information set by a user, and the rotating speed control unit can automatically adjust the rotating speed of the rotating mechanism to the next test rotating speed after one rotating speed test is finished according to the test rotating speed information until the preset number of calibration points and/or stroke requirements are met;
the rotating speed measuring unit is used for measuring the rotating speed of the rotating mechanism and sending a comparison instruction when the rotating speed is fixed, and according to the comparison instruction, the data processing mechanism is triggered to obtain a theoretical pressure value delta P and then the theoretical pressure value delta P and a measured pressure value PeAnd (6) carrying out comparison.
9. The utility model provides an intelligence biasing means for manometer test which characterized in that: the test device comprises a rotating mechanism, wherein a tested equipment mounting part, a linear guide rail, a sliding block and a piston are arranged on the rotating mechanism;
the tested equipment mounting part is used for fixedly mounting the tested pressure gauge on the rotating mechanism;
the linear guide rail is fixedly arranged on the rotating mechanism and arranged along the radius direction of the rotating mechanism, and the sliding block is movably arranged on the linear guide rail and can move on the linear guide rail along the radius direction of the rotating mechanism;
the piston includes piston chamber and piston rod, piston chamber fixed mounting just is located between test equipment installation department and the slider on rotary mechanism, the piston chamber passes through the pipe and is connected with the manometer that receives the test and form the atmospheric pressure passageway, piston rod rigid connection is to the slider on, and the slider drives when moving on linear guide the piston rod motion, the gas pressure in the piston chamber changes and acts on receiving on the manometer through aforementioned atmospheric pressure passageway.
10. A smart pressure applicator as defined in claim 9 wherein: the movement distance of the sliding block on the linear guide rail is adjusted by adjusting the rotating speed of the rotating mechanism, so that the air pressure acting on the pressure gauge to be measured is adjusted.
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