Micro-pressure pressure instrument auxiliary calibration automatic leveling device and method

Abstract

The application relates to a micro-pressure pressure instrument auxiliary detection automatic leveling device and method, a high-precision inclination sensor is connected with an upper computer, signals collected are transmitted to the upper computer, the upper computer is connected with an electric control angular displacement controller, signals processed are input into the electric control angular displacement controller, the electric control angular displacement controller is connected with a precision electric pendulum table, the precision electric pendulum table is controlled to correct X and Y axes according to signals, the precision electric pendulum table is installed above a base, and a workbench is installed above the precision electric pendulum table. The application is used for detecting and calibrating various micro-pressure pressure instruments in laboratories and online detection, can greatly improve the accuracy of detection or calibration results of micro-pressure pressure instruments, especially micro-differential pressure transmitters and micro-differential pressure digital tables, and the automatic adjustment design of the whole device can be used for online detection and can be applied to the detection and calibration fields of other instruments.

Description

Technical Field

[0001] This invention belongs to the field of calibration technology, and in particular to an automatic leveling device and method for auxiliary calibration of micro-pressure instruments. Background Technology

[0002] Micro-pressure instruments are a crucial component of professional pressure instruments, widely used in industries such as factory metrology, laboratories, and healthcare. The accuracy of traceability for micro-pressure instruments is paramount. Micro-pressure instruments have stringent requirements for the calibration environment; in addition to temperature requirements, the most critical aspect in actual calibration is the levelness of the calibration bench.

[0003] Currently, there is no automatic leveling platform designed for micro-pressure instruments in China. Most of the patents for automatic leveling devices are related to construction, cranes, mounting platforms, vehicles, surveying, etc. Small automatic leveling devices are either designed in layers or have coarse and fine adjustment, or they have integrated automatic leveling into machines such as 3D printers and drones, which are not suitable for the daily verification or calibration of micro-pressure instruments.

[0004] Currently, the verification or calibration of micro-pressure instruments is carried out on a test bench. Wooden benches are inevitably subject to wear and tear, while plastic benches, due to their uneven base, cannot guarantee a level surface. Most micro-pressure instruments are verified or calibrated based on the data at the time of verification, resulting in significant errors in the instrument readings. These readings do not reflect the actual conditions of the users and fail to truly achieve the purpose of transmitting actual measurement values. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and to propose an automatic leveling device and method for auxiliary verification of micro-pressure instruments, which can greatly improve the accuracy of verification or calibration results of micro-pressure instruments, especially micro differential pressure transmitters and micro differential pressure digital meters.

[0006] The technical problem solved by this invention is achieved through the following technical solution:

[0007] An automatic leveling device for auxiliary calibration of a micro-pressure instrument is characterized by comprising a high-precision tilt sensor, a precision electric pendulum stage, an electrically controlled angular displacement controller, a worktable, a base, and a host computer. The high-precision tilt sensor is connected to the host computer to transmit the collected signal. The host computer is connected to the electrically controlled angular displacement controller to input the processed signal. The electrically controlled angular displacement controller is connected to the precision electric pendulum stage to control the stage to correct the X and Y axes according to the signal. The precision electric pendulum stage is mounted on top of the base, and the worktable is mounted on top of the stage.

[0008] Furthermore, the high-precision tilt sensor is set on the X-axis and Y-axis positions of the worktable. The high-precision tilt sensor includes an X-axis high-precision tilt sensor and a Y-axis high-precision tilt sensor, wherein the X-axis high-precision tilt sensor is set on the X-axis of the worktable and the Y-axis high-precision tilt sensor is set on the Y-axis of the worktable.

[0009] Furthermore, the high-precision tilt sensor is installed on the worktable using a bubble level, and the installation and adjustment are carried out by utilizing the principle that the high-precision tilt sensor measures the tilt of the axis around a rotation axis parallel to the measuring axis without producing an angle output.

[0010] Furthermore, the electronically controlled angular displacement controller includes an X-axis angular displacement stage and a Y-axis angular displacement stage. The X-axis angular displacement stage is mounted on the X-axis of the electronically controlled angular displacement controller and is used to adjust the Z-axis angle of the worktable surface relative to the X-axis. The Y-axis angular displacement stage is mounted on the Y-axis of the electronically controlled angular displacement controller and is used to adjust the Z-axis angle of the electronically controlled angular displacement controller relative to the Y-axis. The X-axis and Y-axis angular displacement stages are driven by piezoelectric motors. The piezoelectric motors convert the rotational motion of the motor shaft into the motion of the horizontal adjustment stage along an arc through a worm gear mechanism.

[0011] A leveling method for an automatic leveling device of a micro-pressure instrument includes the following steps:

[0012] Step 1: The host computer starts running;

[0013] Step 2: The host computer waits for the input angle and starts controlling the high-precision tilt sensor;

[0014] Step 3: The host computer communicates with the high-precision tilt sensor in real time to collect the real-time angle.

[0015] Step 4: The host computer receives the real-time angle and determines whether the real-time angle meets the set value. If it does not meet the set value, proceed to step 5; otherwise, return to step 3.

[0016] Step 5: The host computer calculates the dual-axis adjustment angle based on the system structure parameters and converts the calculated angle into a signal for transmission to the electronic angular displacement controller;

[0017] Step 6: The electric angular displacement controller controls the movement of the precision electric swing table and adjusts the angle of the worktable above the precision electric swing table.

[0018] Step 7: Determine if the precision electric swing stage has stopped working. If it has stopped working, stop the operation and the calibration is complete; otherwise, return to step 3.

[0019] Furthermore, step 5, calculating the dual-axis adjustment angle based on system structure parameters, includes: a clockwise rotation from the actual X-axis to the standard X' axis. The angle is 1 degree, and the actual X-axis is counterclockwise from the standard X' axis. Angle of 1 degree, the actual Y-axis to the standard Y' axis is clockwise. Angle of 1 degree, the actual Y-axis to the standard Y' axis is counterclockwise. Angle of degrees.

[0020] Furthermore, the actual X-axis is clockwise from the standard X' axis. The method for calculating the included angle is as follows:

[0021] If the actual X-axis to X' axis is clockwise With a minute included angle, the high-precision tilt sensor measures the X-axis angle as follows: Let the measuring angle be... The coordinates of the extended line L are (x0, y0, z0). The X' axis of the precision electric swing stage needs to be adjusted. ':

[0022] .

[0023] Furthermore, the actual X-axis is counterclockwise from the standard X' axis. The method for calculating the included angle is as follows:

[0024] If the actual X-axis to X' axis is counterclockwise With a minute included angle, the high-precision tilt sensor measures the X-axis angle as follows: Let the measuring angle be... The coordinates of the extended line L are (x0, y0, z0). The X' axis of the precision electric swing stage needs to be adjusted. ':

[0025] .

[0026] Furthermore, the actual Y-axis is clockwise from the standard Y' axis. The method for calculating the included angle is as follows:

[0027] If the actual Y-axis to Y' axis is clockwise With a minute included angle, the high-precision tilt sensor measures the Y-axis angle as follows: Let the measuring angle be... The coordinates of the extended line L are (x0, y0, z0). The X' axis of the precision electric swing stage needs to be adjusted. ':

[0028] .

[0029] Furthermore, the actual Y-axis is counterclockwise from the standard Y' axis. The method for calculating the included angle is as follows:

[0030] If the actual Y-axis to Y' axis has a counterclockwise rotation With a minute included angle, the high-precision tilt sensor measures the Y-axis angle as follows: Let the measuring angle be... The coordinates of the extended line L are (x0, y0, z0). The X' axis of the precision electric swing stage needs to be adjusted. ':

[0031] .

[0032] The advantages and positive effects of this invention are:

[0033] This invention connects a high-precision tilt sensor to a host computer, transmitting the collected signals. The host computer then connects to an electronically controlled angular displacement controller, inputting the processed signals back to the controller. The controller connects to a precision electric pendulum stage, which, based on the signals, controls the stage to correct the X and Y axes. The precision electric pendulum stage is mounted on a base, and a worktable is mounted on top of it. This invention is used for the verification and calibration of various micro-pressure instruments in laboratories and for online testing. It can significantly improve the accuracy of verification or calibration results for micro-pressure instruments, especially differential pressure transmitters and digital differential pressure meters. The automatic adjustment design of the entire device allows for online testing and can also be applied to the verification and calibration of other instruments. Attached Figure Description

[0034] Figure 1 This is the left view of the present invention;

[0035] Figure 2 This is a bottom view of the present invention;

[0036] Figure 3 This is a top view of the present invention;

[0037] Figure 4 This is a schematic diagram illustrating the leveling principle of the precision electric swing stage of the present invention.

[0038] Figure 5 This is a flowchart of the present invention;

[0039] Figure 6 This invention relates to the adjustment principle of the precision electric swing stage. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings.

[0041] An automatic leveling device for auxiliary calibration of a micro-pressure instrument includes a high-precision tilt sensor, a precision electric pendulum stage, an electrically controlled angular displacement controller, a worktable, a base, and a host computer. The high-precision tilt sensor is connected to the host computer to transmit the collected signal. The host computer is connected to the electrically controlled angular displacement controller to input the processed signal. The electrically controlled angular displacement controller is connected to the precision electric pendulum stage to control the stage to correct the X and Y axes according to the signal. The precision electric pendulum stage is mounted on the base, and the worktable is mounted on top of the stage.

[0042] like Figure 1 , Figure 2 and Figure 3 As shown, high-precision tilt sensors are set on the X-axis and Y-axis positions of the worktable. The high-precision tilt sensors include an X-axis high-precision tilt sensor and a Y-axis high-precision tilt sensor, wherein the X-axis high-precision tilt sensor is set on the X-axis of the worktable, and the Y-axis high-precision tilt sensor is set on the Y-axis of the worktable.

[0043] To prevent measurement errors caused by the high-precision tilt sensor's measuring axis not being parallel to the worktable, the high-precision tilt sensor is mounted on the worktable using a bubble level. The installation and adjustment are then performed based on the principle that the high-precision tilt sensor's measuring axis tilts around a rotation axis parallel to the measuring axis without producing an angle output. Taking the X-axis high-precision tilt sensor installation as an example, after installing the X-axis high-precision tilt sensor using a bubble level, the Y-axis angle is adjusted using an electronically controlled angular displacement controller. If the X-axis high-precision tilt sensor does not output any angle change at this point, the installation is considered complete.

[0044] The electronically controlled angular displacement controller includes an X-axis angular displacement stage and a Y-axis angular displacement stage. The X-axis angular displacement stage is mounted on the X-axis of the controller and is used to adjust the Z-axis angle of the worktable surface relative to the X-axis. The Y-axis angular displacement stage is mounted on the Y-axis and is used to adjust the Z-axis angle of the controller relative to the Y-axis. Both the X-axis and Y-axis angular displacement stages are driven by piezoelectric motors. The piezoelectric motors convert the rotational motion of the motor shaft into the motion of the horizontal adjustment stage along an arc via a worm gear mechanism. The pitch and yaw angles of the electronically controlled angular displacement controller can reach ±15°. The accuracy of the entire device can reach 0.0085. The minimum angular error can reach 0.0029. It can also be used for the verification and calibration of micro-pressure instruments under special conditions.

[0045] like Figure 6As shown, the X-axis angular displacement stage used in this invention is installed above the Y-axis angular displacement stage. The X-axis and Y-axis angular displacement stages are set horizontally and vertically. By adjusting the knob on the left side of the X-axis angular displacement stage, the stage above the X-axis can be swung left and right to adjust the X-axis. By adjusting the knob on the left side of the Y-axis angular displacement stage, the stage above the Y-axis can be swung back and forth to adjust the Y-axis. Since the X-axis angular displacement stage is located above the Y-axis angular displacement stage, the worktable is in a horizontal state after the X-axis and Y-axis angular displacement stages are adjusted. At the same time, the worktable is set above the X-axis angular displacement stage via a turntable. After the X-axis and Y-axis angular displacement stages are adjusted, the worktable is rotated by rotating the turntable. During the rotation, the high-precision tilt sensor is continuously checked. After rotating 360 degrees, the worktable is leveled.

[0046] The base uses a mechanically supported rigid platform, which is not affected by the underlying surface and can always remain level. It also has sufficient load-bearing capacity to meet the verification or calibration requirements of all micro-pressure instruments.

[0047] The host computer is the software operating device for the instrument. Calibration personnel can receive angle data from the high-precision tilt sensor through the host computer and control the software via an electronically controlled angular displacement controller to manage the automatic leveling device of the entire micro-pressure instrument. Ultimately, angle adjustment is achieved through a precision electric swing stage. The host computer software operation has two implementation directions: one is automatic horizontal adjustment, and the other is the ability to arbitrarily position the worktable surface using the host computer to meet measurement requirements under special conditions.

[0048] A leveling method for an automatic leveling device for auxiliary calibration of micro-pressure instruments, such as... Figure 5 As shown, it includes the following steps:

[0049] Step 1: The host computer starts running.

[0050] Step 2: The host computer waits for the input angle and starts controlling the high-precision tilt sensor.

[0051] Step 3: The host computer communicates with the high-precision tilt sensor in real time to collect the real-time angle.

[0052] Step 4: The host computer receives the real-time angle and determines whether the real-time angle meets the set value. If it does not meet the set value, proceed to step 5; otherwise, return to step 3.

[0053] The dual-axis adjustment angle is calculated based on the system structure parameters, including: a clockwise rotation from the actual X-axis to the standard X' axis. The angle is 1 degree, and the actual X-axis is counterclockwise from the standard X' axis. Angle of 1 degree, the actual Y-axis to the standard Y' axis is clockwise. Angle of 1 degree, the actual Y-axis to the standard Y' axis is counterclockwise. Angle of degrees.

[0054] like Figure 4 As shown, the leveling principle is as follows: Ideally, the X-axis is parallel to the X'-axis and the Y-axis is parallel to the Y'-axis. The measurement angle of the two high-precision tilt sensors is the leveling angle of the precision electric swing table.

[0055] The actual X-axis is clockwise from the standard X' axis. The method for calculating the included angle is as follows:

[0056] If the actual X-axis to X' axis is clockwise With a minute included angle, the high-precision tilt sensor measures the X-axis angle as follows: Let the measuring angle be... The coordinates of the extended line L are (x0, y0, z0). The X' axis of the precision electric swing stage needs to be adjusted. ':

[0057] .

[0058] The actual X-axis rotates counterclockwise from the standard X' axis. The method for calculating the included angle is as follows:

[0059] If the actual X-axis to X' axis is counterclockwise With a minute included angle, the high-precision tilt sensor measures the X-axis angle as follows: Let the measuring angle be... The coordinates of the extended line L are (x0, y0, z0). The X' axis of the precision electric swing stage needs to be adjusted. ':

[0060] .

[0061] The actual Y-axis is clockwise from the standard Y' axis. The method for calculating the included angle is as follows:

[0062] If the actual Y-axis to Y' axis is clockwise With a minute included angle, the high-precision tilt sensor measures the Y-axis angle as follows: Let the measuring angle be... The coordinates of the extended line L are (x0, y0, z0). The X' axis of the precision electric swing stage needs to be adjusted. ':

[0063] .

[0064] The actual Y-axis rotates counterclockwise from the standard Y' axis. The method for calculating the included angle is as follows:

[0065] If the actual Y-axis to Y' axis has a counterclockwise rotation With a minute included angle, the high-precision tilt sensor measures the Y-axis angle as follows: Let the measuring angle be... The coordinates of the extended line L are (x0, y0, z0). The X' axis of the precision electric swing stage needs to be adjusted. ':

[0066] .

[0067] Step 5: The host computer calculates the dual-axis adjustment angle based on the system structure parameters and converts the calculated angle into a signal to be transmitted to the electronic angular displacement controller.

[0068] Step 6: The electric angular displacement controller controls the movement of the precision electric swing table and adjusts the angle of the worktable above the precision electric swing table.

[0069] Step 7: Determine if the precision electric swing stage has stopped working. If it has stopped working, stop the operation and the calibration is complete; otherwise, return to step 3.

[0070] Based on the above-mentioned automatic leveling device and method for auxiliary calibration of micro-pressure instruments, the effectiveness of the present invention was verified by conducting tests.

[0071] Taking a (-100~100) Pa differential pressure transmitter as an example, within the range of 4mA~20mA, when the platform has a 0.5 degree angle with the horizontal plane, that is, a levelness error of 9mm / m, it will cause a current indication error of 0.105mA. If the differential pressure transmitter is a 0.5 class pressure transmitter, the pressure transmitter data will not meet the class requirements due to the unevenness of the calibration platform.

[0072] A 0-1 kPa differential pressure transmitter was used as the test object. This transmitter has a current output, a full-scale range of 16 mA, and an accuracy class of 0.075, meaning a maximum permissible error of ±0.012 mA. We tested the transmitter using conventional test methods, and the data are shown in Table 1.

[0073] Table 1. Routine test data for differential pressure transmitter

[0074]

[0075] The experiment was continued using the automatic leveling device of the micro-pressure instrument. The straight line where the H and L ends of the micro-differential pressure transmitter are located is parallel to the X-axis of the leveling device. Adjusting the Y-axis angle of the leveling device has no effect on the data. The experimental results are shown in Table 2.

[0076] Table 2 Test data of the leveling device

[0077]

[0078] It should be emphasized that the embodiments described in this invention are illustrative rather than limiting. Therefore, this invention includes, but is not limited to, the embodiments described in the specific implementation. Any other implementations derived by those skilled in the art based on the technical solutions of this invention are also within the scope of protection of this invention.

Claims

1. A leveling method for an automatic leveling device for auxiliary calibration of micro-pressure instruments, characterized in that: The leveling device used includes a high-precision tilt sensor, a precision electric swing stage, an electric angular displacement controller, a worktable, a base, and a host computer. The high-precision tilt sensor is connected to the host computer to transmit the collected signals. The host computer is connected to the electric angular displacement controller to input the processed signals. The electric angular displacement controller is connected to the precision electric swing stage to control the precision electric swing stage to correct the X and Y axes according to the signals. The precision electric swing stage is installed on top of the base, and the worktable is installed on top of the precision electric swing stage. Furthermore, the high-precision tilt sensor is set at the X-axis and Y-axis positions on the worktable. The high-precision tilt sensor includes an X-axis high-precision tilt sensor and a Y-axis high-precision tilt sensor, wherein the X-axis high-precision tilt sensor is set on the X-axis of the worktable and the Y-axis high-precision tilt sensor is set on the Y-axis of the worktable. Moreover, the high-precision tilt sensor is installed on the workbench using a bubble level, and the installation and adjustment are carried out by utilizing the principle that the high-precision tilt sensor measures the tilt of the axis around a rotation axis parallel to the measuring axis without producing an angle output. Furthermore, the electronically controlled angular displacement controller includes an X-axis angular displacement stage and a Y-axis angular displacement stage. The X-axis angular displacement stage is mounted on the X-axis of the electronically controlled angular displacement controller and is used to adjust the Z-axis angle of the worktable surface relative to the X-axis. The Y-axis angular displacement stage is mounted on the Y-axis of the electronically controlled angular displacement controller and is used to adjust the Z-axis angle of the electronically controlled angular displacement controller relative to the Y-axis. The X-axis angular displacement stage and the Y-axis angular displacement stage are driven by a piezoelectric motor. The piezoelectric motor converts the rotational motion of the motor's rotating shaft into the motion of the horizontal adjustment stage along an arc through a worm gear mechanism. The leveling method includes the following steps: Step 1: The host computer starts running; Step 2: The host computer waits for the input angle and starts controlling the high-precision tilt sensor; Step 3: The host computer communicates with the high-precision tilt sensor in real time to collect the real-time angle. Step 4: The host computer receives the real-time angle and determines whether the real-time angle meets the set value. If it does not meet the set value, proceed to step 5; otherwise, return to step 3. Step 5: The host computer calculates the dual-axis adjustment angle based on the system structure parameters and converts the calculated angle into a signal for transmission to the electronic angular displacement controller; Step 5 calculates the dual-axis adjustment angles based on the system structure parameters, including: a clockwise angle of θ degrees between the actual X-axis and the standard X' axis; a counterclockwise angle of θ degrees between the actual X-axis and the standard X' axis; and a clockwise angle between the actual Y-axis and the standard Y' axis. Angle of 1 degree, the actual Y-axis to the standard Y' axis is counterclockwise. Angle; The method for calculating the clockwise angle θ degrees between the actual X-axis and the standard X' axis is as follows: If there is a small clockwise angle θ degrees between the actual X-axis and X'-axis, and the measured angle of the X-axis of the high-precision tilt sensor is α, let the coordinate point of the extension line L of the measured angle α be (x0, y0, z0), the X'-axis of the precision electric swing stage needs to be adjusted by angle α': α′=arctan[x0 / (cosθ·x0-sinθ·y0)]·α; The method for calculating the counterclockwise angle θ degrees between the actual X-axis and the standard X' axis is as follows: If there is a small counterclockwise angle θ degrees between the actual X-axis and X'-axis, and the measured angle of the X-axis of the high-precision tilt sensor is α, let the coordinate point of the extension line L of the measured angle α be (x0, y0, z0), the X'-axis of the precision electric swing stage needs to be adjusted by the angle α': α′=arctan[x0 / (cosθ·x0+sinθ·y0)]·α; The actual Y-axis is clockwise from the standard Y' axis. The method for calculating the included angle is as follows: If the actual Y-axis to Y' axis is clockwise For a small angle, the Y-axis measurement angle of a high-precision tilt sensor is β. Let the coordinates of the point along the extension L of the measurement angle β be (x0, y0, z0). The X' axis of a precision electric tilting stage needs to be adjusted by angle β'. The actual Y-axis rotates counterclockwise from the standard Y' axis. The method for calculating the included angle is as follows: If the actual Y-axis to Y' axis has a counterclockwise rotation For a small angle, the Y-axis measurement angle of a high-precision tilt sensor is β. Let the coordinates of the point along the extension L of the measurement angle β be (x0, y0, z0). The X' axis of a precision electric tilting stage needs to be adjusted by angle β'. Step 6: The electric angular displacement controller controls the movement of the precision electric swing table and adjusts the angle of the worktable above the precision electric swing table. Step 7: Determine if the precision electric swing stage has stopped working. If it has stopped working, stop the operation and the calibration is complete; otherwise, return to step 3.

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