A pressure gauge automatic calibration device

Abstract

The present invention discloses an automatic calibration device for pressure gauges, comprising a pressure gauge silo, a gripping mechanism, a detection interface, a positioning and tightening mechanism, a visual inspection device, a pressure controller and a host computer; the pressure gauge silo is used to store pressure gauges to be calibrated, the gripping mechanism is used to identify and grip the pressure gauges to be calibrated from the pressure gauge silo and place them on the detection interface, the positioning and tightening mechanism is used to rotate the detection interface to tighten the pressure gauges to be calibrated, the pressure controller is used to apply a preset pressure to the pressure gauges to be detected, the visual inspection device is used to collect information about the pressure gauges to be calibrated and collect the readings of the pressure gauges to be detected during the process of applying the preset pressure and send them to the host computer, the host computer is used to receive the information about the pressure gauges to be calibrated and the reading information of the pressure gauges to be detected, and calculate the deviation of the pressure gauges to be calibrated according to the reading information; the device can reduce the calibration error of the pressure gauges.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical metrology, and in particular to an automatic calibration device for a pressure gauge. Background Art

[0002] In industrial production, pressure is an important process parameter. As a pressure detection device, pressure gauges are widely used due to their low price and simple use. According to relevant regulations, pressure gauges are mandatory inspection items and must be inspected every six months, which requires a lot of work.

[0003] The research and development of automatic calibration devices for pointer pressure gauges in China, especially the research and development of pressure value recognition, is still in its early stages. At present, manual pressure platforms are mainly used to generate pressure, and then the human eye reads the pressure indication value and the indication value of the standard gauge, and the indication error of each point is obtained by subtracting them. This method of using a manual pressure platform to generate pressure and then reading the degree by the human eye has low work efficiency and it is difficult to continuously ensure the measurement accuracy, which can no longer meet the current measurement work needs. Summary of the invention

[0004] The invention provides an automatic calibration device for a pressure gauge, so as to solve the problems of low working efficiency and low accuracy caused by manual pressurization and manual reading of the pressure gauge in the prior art.

[0005] A pressure gauge automatic calibration device, comprising a pressure gauge silo, a gripping mechanism, a detection interface, a positioning and tightening mechanism, a visual detection device, a pressure controller and a host computer;

[0006] The pressure gauge silo is used to store the pressure gauges to be calibrated, the grabbing mechanism is used to identify and grab the pressure gauges to be calibrated from the pressure gauge silo and place them on the detection interface, the positioning and tightening mechanism is used to rotate the detection interface to tighten the pressure gauge to be calibrated, the pressure controller is used to apply a preset pressure to the pressure gauge to be detected, the visual inspection device is used to collect information about the pressure gauge to be calibrated and collect the reading of the pressure gauge to be detected during the process of applying the preset pressure and send it to the host computer, the host computer is used to receive the information about the pressure gauge to be calibrated and the reading information of the pressure gauge to be detected, and calculate the deviation of the pressure gauge to be calibrated according to the reading information;

[0007] The positioning and tightening mechanism is also used to rotate the detection interface after the calibration is completed to release the tightening state of the calibrated pressure gauge, and the grasping mechanism is also used to grasp the calibrated pressure gauge and put it back into the pressure gauge silo.

[0008] In some embodiments, the pressure gauge silo includes a fixed positioning groove for fixing the pressure gauge to be calibrated and a sloped placement plate for placing the fixed positioning groove.

[0009] In some embodiments, the grasping mechanism includes a first image acquisition device, a first light source, a six-axis collaborative manipulator, a suction cup, a vacuum generator and a controller. The first image acquisition device and the first light source are arranged in coordination. The first image acquisition device and the suction cup are arranged at the end of the six-axis collaborative manipulator. The first image acquisition device is used to acquire image information of the pressure gauge to be calibrated and send it to the controller. The controller is used to perform target recognition according to the image information, and after identifying the bottom of the pressure gauge to be calibrated, generate a suction control signal to control the vacuum generator to suck the bottom of the pressure gauge to be calibrated through the suction cup, and control the six-axis collaborative manipulator to place the pressure gauge to be calibrated on the detection interface.

[0010] In some embodiments, the detection interface is threadedly connected to the pressure gauge to be calibrated.

[0011] In some embodiments, the positioning and tightening mechanism includes a quick-lock joint, a clutch, a right-angle reducer, a pulley and a servo motor. The quick-lock joint is used to clamp the detection interface, and the clutch, right-angle reducer, pulley and servo motor cooperate to drive the quick-lock joint to rotate.

[0012] In some embodiments, the visual inspection device includes a second image acquisition device, a calibration cylinder, a rectangular coordinate module and a second light source. The calibration cylinder is used to push the pressure gauge to be calibrated, and the rectangular coordinate module is used to position the second image acquisition device. The second image acquisition device is arranged in conjunction with the second light source to collect information of the pressure gauge to be calibrated and reading information of the pressure gauge to be inspected and send them to the host computer.

[0013] In some embodiments, the information of the pressure gauge to be calibrated includes the manufacturer, serial number, range and grade of the pressure gauge to be calibrated.

[0014] In some embodiments, the rectangular coordinate module includes an X-axis linear module and a Z-axis linear module.

[0015] In some embodiments, the pressure controller model is PACE5000.

[0016] The pressure gauge automatic calibration device provided by the present invention realizes the full automation of the pressure gauge calibration process including loading, tightening, pressurizing, reading, unloading and data processing, greatly improves work efficiency, greatly reduces manual labor, reduces errors, and has a calibration capability covering most pressure gauges with strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of an embodiment of the pressure gauge automatic calibration device provided by the present invention.

[0018] Figure 2 A schematic structural diagram of an embodiment of a grabbing mechanism in the pressure gauge automatic calibration device provided by the present invention.

[0019] Figure 3 A structural schematic diagram of an embodiment of a six-axis collaborative manipulator in the pressure gauge automatic calibration device provided by the present invention.

[0020] Figure 4 The present invention provides a schematic structural diagram of an embodiment of a positioning and tightening mechanism in the automatic calibration device for a pressure gauge provided by the present invention.

[0021] Figure 5 A structural schematic diagram of an embodiment of a visual inspection device in a pressure gauge automatic calibration device provided by the present invention. Specific implementation plan

[0022] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] refer to Figure 1 In some embodiments, a pressure gauge automatic calibration device is provided, including a pressure gauge silo 1, a gripping mechanism 2, a detection interface 3, a positioning and tightening mechanism 4, a visual detection device 5, a pressure controller 6, and a host computer 7;

[0024] The pressure gauge silo 1 is used to store the pressure gauges to be calibrated, the grabbing mechanism 2 is used to identify and grab the pressure gauges to be calibrated from the pressure gauge silo 1 and place them on the detection interface 3, the positioning and tightening mechanism 4 is used to rotate the detection interface 3 to tighten the pressure gauge to be calibrated, the pressure controller 6 is used to apply a preset pressure to the pressure gauge to be detected, the visual inspection device 5 is used to collect information of the pressure gauge to be calibrated and collect the reading of the pressure gauge to be detected during the process of applying the preset pressure and send it to the host computer 7, the host computer 7 is used to receive the information of the pressure gauge to be calibrated and the reading information of the pressure gauge to be detected, and calculate the deviation of the pressure gauge to be calibrated according to the reading information;

[0025] The positioning and tightening mechanism 4 is also used to rotate the detection interface 3 after the calibration is completed to release the tightening state of the calibrated pressure gauge, and the grasping mechanism 2 is also used to grasp the calibrated pressure gauge and put it back into the pressure gauge silo 1.

[0026] In some embodiments, the pressure gauge silo 1 includes a fixed positioning groove for fixing the pressure gauge to be calibrated and a sloped placement plate for placing the fixed positioning groove.

[0027] Before the pressure gauge to be calibrated is placed in the pressure gauge silo 1, the appearance inspection and zero position inspection are manually completed. For the pressure gauges whose joints do not match the detection interface 3, standard adapters are uniformly installed. The fixed positioning groove in the pressure gauge silo 1 fixes the dial neck of the pressure gauge to be calibrated, and the slope of the slope placement plate can well ensure the consistent positioning of the pressure gauge to be calibrated.

[0028] In some embodiments, reference Figure 2 and Figure 3 The grasping mechanism 2 includes a first image acquisition device 21, a first light source 22, a six-axis collaborative manipulator 23, a suction cup 24, a vacuum generator 25 and a controller (not shown in the figure). The first image acquisition device 21 and the first light source 22 are arranged in coordination. The first image acquisition device 21 and the suction cup 24 are arranged at the end of the six-axis collaborative manipulator 23. The first image acquisition device 21 is used to acquire image information of the pressure gauge to be calibrated and send it to the controller. The controller is used to perform target recognition according to the image information, and after recognizing the bottom of the pressure gauge to be calibrated, generate a suction control signal to control the vacuum generator 25 to suck the bottom of the pressure gauge to be calibrated through the suction cup 24, and control the six-axis collaborative manipulator 23 to place the pressure gauge to be calibrated on the detection interface.

[0029] In some embodiments, the detection interface 3 is threadedly connected to the pressure gauge to be tested. The detection interface 3 is provided with an internal thread, and the pressure gauge to be tested is provided with an external thread. The pressure gauge to be tested can be tightened or loosened by rotating the detection interface 3.

[0030] In some embodiments, reference Figure 4 The positioning and tightening mechanism 4 includes a quick-lock joint 41, a clutch 42, a right-angle reducer 43, a pulley 44 and a servo motor 45. The quick-lock joint 41 is used to clamp the detection interface, and the clutch 42, the right-angle reducer 43, the pulley 44 and the servo motor 45 cooperate to drive the quick-lock joint 41 to rotate.

[0031] In some embodiments, reference Figure 5 The visual inspection device 5 includes a second image acquisition device 51, a calibration cylinder 52, a rectangular coordinate module and a second light source 53. The calibration cylinder 52 is used to push the pressure gauge to be calibrated, and the rectangular coordinate module is used to position the second image acquisition device 51. The second image acquisition device 51 and the second light source 53 are arranged in cooperation to collect information of the pressure gauge to be calibrated and reading information of the pressure gauge to be detected and send them to the host computer 7.

[0032] In some embodiments, the rectangular coordinate module includes an X-axis linear module 54 and a Z-axis linear module 55 .

[0033] After the pressure gauge to be calibrated is tightened, the calibration cylinder pushes the dial to make the dial face the second image acquisition device. The rectangular coordinate module moves to move the second image acquisition device to a suitable position.

[0034] In some embodiments, the information of the pressure gauge to be calibrated includes the manufacturer, serial number, range and grade of the pressure gauge to be calibrated.

[0035] In some embodiments, the pressure controller 6 is model PACE5000.

[0036] The working process of calibrating a pressure gauge using an automatic pressure gauge calibration device is as follows:

[0037] Pretreatment of pressure gauge: Manually complete appearance inspection and zero position inspection; for pressure gauges with joints other than M20*1.5 external threads, install standard adapters and unify interfaces; place on pressure gauge silo; manually press the one-touch start button to complete equipment startup. Emergency measures: If an abnormal situation occurs during operation, the operator can press this button to stop the equipment operation.

[0038] Loading and tightening: The gripping mechanism 2 locates the pressure gauge to be calibrated in the pressure gauge bin, and the six-axis collaborative manipulator 23 grabs the identified pressure gauge to be calibrated through the end suction cup, and then places the pressure gauge to be calibrated on the transfer platform to locate the position of the stud of the pressure gauge to be calibrated by machine vision, and then the pressure gauge to be calibrated is picked up and adjusted to transfer to the detection interface 3. The six-axis collaborative manipulator adjusts the posture of the pressure gauge to be calibrated so that the front of the dial is opposite to the calibration camera, and presses the stud end of the pressure gauge to be calibrated to the quick-lock joint. The positioning and tightening mechanism clamps the quick-lock joint for rotation, and the tightening degree of the quick-lock device is determined by controlling the torque of the motor.

[0039] Tightening test: The pressure controller 6 sends a test instruction to perform a tightness test. If it is qualified, continue; if it is unqualified, re-tighten or alarm; control the pressure controller to perform corresponding leak detection operations. If a leak is found, an alarm will be issued and the positioning tightening mechanism 4 will increase the tightening torque to continue tightening. After tightening, repeat the leak detection operation until the leak detection is qualified.

[0040] Reading information: The basic information of the barometer dial is read through the visual inspection device 5. The calibration camera identifies the range, accuracy level, and brand information of the pressure gauge and sends the information to the host computer. The host computer automatically calculates the allowable deviation and sets the inspection point based on the above information. The allowable deviation is calculated as follows: range × level ÷ 100.

[0041] Pressure detection: Control the pressure controller to perform pressure detection at each detection point of boost and depressurization; after the leak detection is completed, the pressure controller performs indication error calibration and return error calibration according to the corresponding calibration process. The host computer reads the pressure controller data and determines whether the pressure is in place (or the pressure controller automatically gives a pressure stability signal). After confirming that the pressure is in place, the pressure reading on the dial of the barometer to be calibrated is read through the visual detection device, and the host computer calculates the indication error and return error; the pointer angle is calibrated and identified. For the return error calibration, the work of tapping the pressure gauge header is completed by the collaborative robot. At this time, the visual detection device uses the continuous shooting mode to track the pointer swing and identify the maximum pointer swing. Organize the information collected by the calibration vision, and generate a calibration information table through the software.

[0042] After completing the inspection of each point, release the product from its tightening state and put it back into the silo.

[0043] Data processing: The original data such as pictures and readings of each test point are kept for reference; the test data and results are generated into reports and uploaded to the superior system.

[0044] The pressure gauge automatic calibration device provided in the above embodiment realizes the automation of the entire process of pressure gauge calibration, including loading, tightening, pressurizing, reading, unloading and data processing, which greatly improves work efficiency, greatly reduces manual labor, reduces system errors, and has a calibration capability covering the vast majority of pressure gauges, with strong versatility.

[0045] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A pressure gauge automatic calibration device, characterized in that: It includes a pressure gauge silo, a gripping mechanism, a detection interface, a positioning and tightening mechanism, a visual detection device, a pressure controller and a host computer; The pressure gauge silo is used to store the pressure gauges to be calibrated, the grabbing mechanism is used to identify and grab the pressure gauges to be calibrated from the pressure gauge silo and place them on the detection interface, the positioning and tightening mechanism is used to rotate the detection interface to tighten the pressure gauge to be calibrated, the pressure controller is used to apply a preset pressure to the pressure gauge to be calibrated, the visual inspection device includes a second image acquisition device, a correction cylinder, a rectangular coordinate module and a second light source, the correction cylinder is used to push the pressure gauge to be calibrated, the rectangular coordinate module is used to position the second image acquisition device, the second image acquisition device is arranged in conjunction with the second light source, and is used to collect information about the pressure gauge to be calibrated and the reading information of the pressure gauge to be calibrated and send them to a host computer; the host computer is used to receive information about the pressure gauge to be calibrated and the reading information of the pressure gauge to be calibrated, and calculate the deviation of the pressure gauge to be calibrated according to the reading information; The positioning and tightening mechanism includes a quick-lock joint, a clutch, a right-angle reducer, a pulley and a servo motor, wherein the quick-lock joint is used to clamp the detection interface, and the clutch, the right-angle reducer, the pulley and the servo motor cooperate to drive the quick-lock joint to rotate; The positioning and tightening mechanism is also used to rotate the detection interface after the calibration is completed to release the tightening state of the calibrated pressure gauge, and the grabbing mechanism is also used to grab the calibrated pressure gauge and put it back into the pressure gauge silo; The grasping mechanism includes a first image acquisition device, a first light source, a six-axis collaborative manipulator, a suction cup, a vacuum generator and a controller. The first image acquisition device and the first light source are arranged in coordination. The first image acquisition device and the suction cup are arranged at the end of the six-axis collaborative manipulator. The first image acquisition device is used to acquire image information of the pressure gauge to be calibrated and send it to the controller. The controller is used to perform target recognition according to the image information, and after recognizing the bottom of the pressure gauge to be calibrated, generate a suction control signal to control the vacuum generator to absorb the bottom of the pressure gauge to be calibrated through the suction cup, and control the six-axis collaborative manipulator to place the pressure gauge to be calibrated on the detection interface. Loading and tightening: The grasping mechanism locates the pressure gauge to be calibrated in the pressure gauge silo, and the six-axis collaborative robot grabs the identified pressure gauge to be calibrated through the end suction cup, and then places the pressure gauge to be calibrated on the transfer platform, and uses machine vision to locate the position of the stud of the pressure gauge to be calibrated. The pressure gauge to be calibrated is then picked up and adjusted to be transferred to the detection interface. The six-axis collaborative robot adjusts the posture of the pressure gauge to be calibrated so that the front of the dial is opposite to the calibration camera, and presses the stud end of the pressure gauge to be calibrated against the quick-lock joint; the positioning and tightening mechanism clamps the quick-lock joint for rotation, and determines the tightening degree of the quick-lock device by controlling the torque of the motor.

2. The pressure gauge automatic calibration device according to claim 1, characterized in that: The pressure gauge silo comprises a fixed positioning groove for fixing the pressure gauge to be calibrated and a slope placement plate for placing the fixed positioning groove.

3. The automatic pressure gauge calibration device according to claim 1, characterized in that: The detection interface is threadedly connected to the pressure gauge to be calibrated.

4. The pressure gauge automatic calibration device according to claim 1, characterized in that: The information of the pressure gauge to be calibrated includes the manufacturer, serial number, range and grade of the pressure gauge to be calibrated.

5. The pressure gauge automatic calibration device according to claim 1, characterized in that: The rectangular coordinate module includes an X-axis linear module and a Z-axis linear module.

6. The pressure gauge automatic calibration device according to claim 1, characterized in that: The pressure controller model is PACE5000.

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