Intelligent automatic verification system for pointer multimeter

Abstract

The invention provides an intelligent automatic verification system for a pointer universal meter, which relates to the technical field of universal meter verification and comprises a feeding and discharging unit, a visual identification unit, a verification unit and a control unit. The feeding and discharging unit is used for carrying a pointer universal meter to be detected; two identification detection modules in the visual identification unit are respectively arranged above a dial and a control panel of the universal meter with the pointer to be detected, and the position information of the control panel of the universal meter with the pointer to be detected is acquired and sent to the control unit; and the control unit controls the verification unit to perform verification based on the position information, and reads the dial reading through the identification detection module to obtain a verification result. According to the system, the accuracy of operation of the verification unit on the control panel is ensured, the verification reliability is improved, errors caused by manual reading are avoided, and the accuracy of a verification result is ensured; the manual participation is reduced in the process, the verification efficiency is improved, the original record and the verification certificate are finally and automatically completed in the automatic verification process, and the automatic and intelligent verification of the pointer universal meter to be verified is realized.

Description

Technical Field

[0001] The invention relates to the technical field of multimeter verification, and in particular to an intelligent automatic verification system for a pointer multimeter. Background Art

[0002] Traditional multimeters, also known as multi-purpose meters, are indispensable measuring instruments in power electronics and other departments. They are usually used to measure data such as DC current, DC voltage, AC current, AC voltage, resistance parameters, etc. Specifically, they can be divided into two categories according to the composition of the meter head: digital multimeters and pointer multimeters. Among them, pointer multimeters have the advantages of indicating continuous changes, strong anti-interference ability, and no need for batteries for current and voltage ranges. They are widely used by professional and technical personnel. Among them, the characteristic function of the pointer swing amplitude in the pointer multimeter provides technicians with intuitive continuous change indications in many fields such as rail transit, electronic appliances, and maintenance. This is also an important reason why ordinary digital multimeters are difficult to completely replace pointer multimeters.

[0003] At present, the state stipulates that instruments need to be calibrated every year, and the traditional calibration method usually adopts manual operation and combined with naked eye identification. The disadvantages are that the calibration workload is large, the calibration efficiency is low, and it is impossible to realize the full process of automated calibration of pointer multimeters. In addition, the calibration accuracy is greatly affected by human skills and external environmental factors, and the consistency of read data needs to be improved.

[0004] Therefore, a system that can ensure the calibration accuracy of the pointer multimeter and realize the fully automatic intelligent calibration process of the pointer multimeter is in urgent need of research. Summary of the invention

[0005] In view of the deficiencies in the above-mentioned prior art, the present invention provides an intelligent automatic calibration system for a pointer multimeter, which solves the technical problems in the prior art that manual calibration of pointer multimeters by naked eye results in low calibration efficiency and cannot realize calibration automation.

[0006] The present invention provides an intelligent automatic calibration system for a pointer multimeter, comprising a material feeding and discharging unit, a visual recognition unit, a calibration unit and a control unit;

[0007] The feeding and discharging unit is used to carry the pointer multimeter to be tested;

[0008] The visual recognition unit is connected to the control unit, and the visual recognition unit includes a dial recognition detection module and a control panel recognition detection module. The dial recognition detection module is arranged above the dial of the pointer multimeter to be tested, and is used to recognize and record the metrological identification information required for the cover of the calibration certificate of the pointer multimeter to be tested. The control panel recognition detection module is arranged above the control panel of the pointer multimeter to be tested, and is used to obtain the control panel position information of the pointer multimeter to be tested, and send the control panel position information to the control unit, wherein the control panel position information includes the zero knob position information, the measurement gear position information and the terminal recognition position information;

[0009] The control unit is also connected to the calibration unit. The control unit controls the calibration unit to perform calibration actions on the control panel of the pointer multimeter to be tested based on the control panel position information, and reads the dial reading of the pointer multimeter to be tested through the dial recognition and detection module to obtain the calibration result of the pointer multimeter to be tested, complete the original record and issue a calibration certificate.

[0010] Optionally, the feeding and discharging unit includes a conveyor belt, a fixing fixture, a stepping motor and a driver;

[0011] A station to be tested, a testing station and a testing completion station are sequentially arranged along the transmission direction of the conveyor belt;

[0012] The fixing fixture is placed on the conveyor belt and is used to clamp and fix the pointer multimeter to be tested;

[0013] The control unit is connected to the driver, the driver is connected to the stepper motor, the stepper motor is connected to the conveyor belt, and the control unit controls the driver to drive the stepper motor to drive the conveyor belt to rotate, so that the pointer multimeter to be tested on the fixed fixture moves along the transmission direction of the conveyor belt, and passes through the station to be tested, the test station and the test completion station in sequence;

[0014] When the pointer multimeter to be inspected arrives at the testing station, the verification unit performs a verification action on the control panel of the pointer multimeter to be inspected.

[0015] Optionally, a clamping member is provided on the test station, and the clamping member is used to clamp the fixing fixture to fix the pointer multimeter to be tested on the test station;

[0016] A stopper is also provided between the station to be tested and the testing station, and the stopper is used to prevent the fixing fixture on the station to be tested from moving toward the testing station;

[0017] The test completion station is provided with a sensor and a limiter at one end away from the test station. When the sensor detects the pointer multimeter to be tested, the limiter limits the pointer multimeter to be tested, and the sensor sends a stop rotation instruction to the control unit to control the conveyor belt to stop rotating.

[0018] Optionally, the verification unit includes a six-axis robotic arm, a servo electric claw, a driving power supply and a programmable controller;

[0019] The servo electric claw is arranged at the end of the six-axis robot arm, and the driving power supply supplies power to the six-axis robot arm and the servo electric claw respectively;

[0020] The programmable controller is respectively connected to the six-axis robot arm, the servo electric claw and the control unit, and is used to receive the control panel position information sent by the control unit, and control the six-axis robot arm to drive the servo electric claw to reach the top of the control panel of the pointer multimeter to be inspected based on the control panel position information, and control the servo electric claw to perform a calibration action on the control panel of the pointer multimeter to be inspected, and perform a reading action on the dial of the pointer multimeter to be inspected through the dial recognition and detection module, wherein the calibration action includes controlling the servo electric claw to adjust the voltage and current zeroing knob positions and the resistance zeroing knob positions on the control panel respectively to achieve voltage zeroing, current zeroing and resistance zeroing, and the reading action includes forward reading of the voltage and current gears on the dial, and reverse reading of the resistance gear.

[0021] Optionally, the calibration unit further includes a clamping tool and / or a test lead tool;

[0022] The clamping jaw tooling is arranged on the servo electric jaw, and is used to adjust the knob position on the control panel of different types of pointer multimeters to be tested; and / or,

[0023] The test lead tooling is arranged on the servo electric claw and is used for inserting the test lead into a jack on a control panel of different types of pointer multimeters to be tested.

[0024] Optionally, the visual recognition unit further includes a controllable light source matrix;

[0025] The controllable light source matrix is ​​arranged between the dial identification and detection module and the pointer multimeter to be tested, and between the control panel identification and detection module and the pointer multimeter to be tested, and is used to provide a calibration light source.

[0026] Optionally, the control unit includes an electronic control module and a host computer;

[0027] The electric control module includes a material inlet and outlet unit control system, a visual recognition unit control system and a verification unit control system, which are used to control the actions of the material inlet and outlet unit, the visual recognition unit and the verification unit respectively;

[0028] The host computer runs automatic calibration software for a pointer multimeter, and the automatic calibration software for the pointer multimeter is used to control the feeding and discharging unit control system, the visual recognition unit control system and the calibration unit control system to work together to realize automatic calibration of the pointer multimeter to be inspected and automatic acquisition of the calibration results.

[0029] Optionally, the automatic calibration software of the pointer multimeter is integrated with a calibration item switching module and a standard source, wherein the calibration item switching module includes current calibration items, voltage calibration items and resistance calibration items, and the standard source is used to provide an electrical signal reference for the calibration items;

[0030] The host computer controls the calibration unit to perform one of current item calibration, voltage item calibration or resistance item calibration on the control panel of the pointer multimeter to be inspected based on the standard source and the calibration item switching module, and switches.

[0031] Optionally, the pointer multimeter intelligent automatic calibration system further includes a chassis;

[0032] The feeding and discharging unit, the visual recognition unit, the verification unit and the control unit are arranged in the chassis, and a feeding port and a discharging port are respectively provided on both sides of the chassis, the feeding end of the feeding and discharging unit is arranged at the feeding port, and the discharging end of the feeding and discharging unit is arranged at the discharging port;

[0033] A control panel is provided on the front of the chassis, and the control panel is electrically connected to the control unit;

[0034] An observation window is also provided on the front of the chassis, and a transparent protective plate is provided on the observation window.

[0035] Optionally, an air cooling device is provided on the top of the chassis, and the air cooling device is used to dissipate heat inside the chassis;

[0036] The chassis is also provided with an electrical input port and an external expansion port.

[0037] The present invention provides an intelligent automatic calibration system for a pointer multimeter. Two identification and detection modules are arranged to respectively perform visual identification on the dial and control panel of the pointer multimeter to be inspected. On the one hand, the accuracy of the operation of the control panel by the calibration unit can be ensured, the consistency and repeatability of the calibration conditions can be ensured, and the reliability of the calibration can be improved. On the other hand, the pointer position on the dial can be accurately read, thus avoiding the error that may be caused by manual reading, ensuring the accuracy of the calibration result, and at the same time, the measurement identification information of the pointer multimeter can be obtained; the feeding and discharging units automatically operate to carry the pointer multimeter to be inspected to the designated calibration position, thus reducing manual participation and improving the calibration efficiency; the system enables various functional units to work in coordination based on the control of the control unit, thus realizing the automatic and intelligent calibration of the pointer multimeter to be inspected.

[0038] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0039] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0041] Figure 1 A schematic diagram of the structure of the feeding and discharging unit of the intelligent automatic calibration system of the pointer multimeter in one embodiment provided in the present application;

[0042] Figure 2 A schematic diagram of a visual recognition unit of an intelligent automatic calibration system for a pointer multimeter in one embodiment provided in the present application calibrating a pointer multimeter to be inspected;

[0043] Figure 3 A schematic diagram of the structure of a six-axis robotic arm of an intelligent automatic calibration system for a pointer multimeter in an embodiment provided in the present application;

[0044] Figure 4 A schematic diagram of another embodiment provided by the present application, in which a visual recognition unit of an intelligent automatic calibration system for a pointer multimeter calibrates a pointer multimeter to be inspected;

[0045] Figure 5 A control principle diagram of a control unit of an intelligent automatic calibration system for a pointer multimeter in one embodiment provided in the present application;

[0046] Figure 6 A schematic diagram of the structure of a chassis in an intelligent automatic calibration system for a pointer multimeter in an embodiment provided in the present application;

[0047] Figure 7 A functional schematic diagram of automatic calibration software for a pointer multimeter in an intelligent automatic calibration system for a pointer multimeter in one embodiment provided in the present application.

[0048] In the figure:

[0049] 1. Pointer multimeter to be inspected; 2. Fixing fixture; 3. Clamping piece; 4. Stop piece; 5. Sensor; 6. Limit piece; 7. Dial identification and detection module; 8. Control panel identification and detection module; 9. Controllable light source matrix; 10. Chassis; 11. Observation window; 12. Air cooling device;

[0050] A. Station to be tested; B. Testing station; C. Station where testing is completed. DETAILED DESCRIPTION

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] The present invention provides an intelligent automatic calibration system for a pointer multimeter, comprising a material feeding and discharging unit, a visual recognition unit, a calibration unit and a control unit; the material feeding and discharging unit is used to carry the pointer multimeter 1 to be tested; the visual recognition unit is connected to the control unit, such as Figure 2 As shown, the visual recognition unit includes a dial recognition detection module 7 and a control panel recognition detection module 8. The dial recognition detection module 7 is arranged above the dial of the pointer multimeter 1 to be tested, and is used to identify and record the metrological identification information required for the cover of the calibration certificate of the pointer multimeter to be tested. The control panel recognition detection module 8 is arranged above the control panel of the pointer multimeter 1 to be tested, and is used to obtain the control panel position information of the pointer multimeter 1 to be tested, and send the control panel position information to the control unit, wherein the control panel position information includes the zero position knob position information, the measurement gear position information and the terminal identification position information; the control unit is also connected to the calibration unit, and the control unit controls the calibration unit to perform the calibration action on the control panel of the pointer multimeter 1 to be tested based on the control panel position information, and reads the dial reading of the pointer multimeter 1 to be tested through the dial recognition detection module 7, obtains the calibration result of the pointer multimeter 1 to be tested, completes the original record and issues the calibration certificate.

[0055] The present invention provides an intelligent automatic calibration system for a pointer multimeter. Two identification and detection modules are arranged to respectively perform visual identification on the dial and control panel of the pointer multimeter 1 to be inspected. On the one hand, the accuracy of the operation of the control panel by the calibration unit can be ensured, the consistency and repeatability of the calibration conditions can be ensured, and the reliability of the calibration can be improved. On the other hand, the pointer position on the dial can be accurately read, thus avoiding the error that may be caused by manual reading, ensuring the accuracy of the calibration result, and at the same time, the basic identification information of the pointer multimeter can be obtained; the feeding and discharging units automatically operate to carry the pointer multimeter 1 to be inspected to the designated calibration position, thus reducing manual participation and improving the calibration efficiency; the system enables various functional units to work in coordination based on the control of the control unit, thus realizing the automatic and intelligent calibration of the pointer multimeter 1 to be inspected.

[0056] Among them, the dial recognition and detection module 7 obtains the measurement identification information of the pointer multimeter 1 to be tested, including the instrument name, model, manufacturer, factory number, and accuracy level on the dial. The dial recognition and detection module 7 can automatically identify, record and issue certificates for basic identification information.

[0057] Specifically, in the above embodiment, Figure 1As shown, the feeding and discharging unit includes a conveyor belt, a fixing fixture 2, a stepper motor and a driver; a station A to be tested, a test station B and a test completion station C are arranged in sequence along the transmission direction of the conveyor belt; the fixing fixture 2 is placed on the conveyor belt, and is used to clamp and fix the pointer multimeter 1 to be tested; the control unit is connected to the driver control, the driver is connected to the stepper motor drive, the stepper motor is connected to the conveyor belt transmission, and the control unit controls the driver to drive the stepper motor to drive the conveyor belt to rotate, so that the pointer multimeter 1 to be tested on the fixing fixture 2 moves along the transmission direction of the conveyor belt, and passes through the station A to be tested, the test station B and the test completion station C in sequence; when the pointer multimeter 1 to be tested arrives at the test station B, the calibration unit performs a calibration action on the control panel of the pointer multimeter 1 to be tested.

[0058] In this embodiment, the automatic operation of the conveyor belt enables the pointer multimeter 1 to be tested to be moved from one station to the next in an orderly manner, thereby improving the efficiency of the overall calibration process. Specifically, the pointer multimeter 1 to be tested is placed at the test station A, and the movement of the conveyor belt allows the pointer multimeter 1 to be tested to reach the test station B, and is calibrated using a calibration unit. After the calibration is completed, the pointer multimeter 1 moves with the movement of the conveyor belt to the test completion station C, and finally the pointer multimeter 1 to be tested is taken out, completing the entire process of automated calibration; the fixing fixture 2 is used as the pointer multimeter 1 to be tested and placed on the conveyor belt. The carrier on the conveyor belt can stably clamp the multimeter to be tested, ensuring that it will not be positionally shifted during the calibration process, which helps to improve the accuracy of visual recognition and calibration; the combined use of the driver and the stepper motor can accurately control the speed and position of the conveyor belt, ensuring that each pointer multimeter 1 to be tested can accurately reach the designated workstation for corresponding operations; the control unit's coordinated control of the entire system enables the entire process from receiving the pointer multimeter 1 to be tested to completing the calibration to be executed automatically, reducing the possibility of human intervention and improving the consistency and reliability of the work.

[0059] Furthermore, a clamping member 3 is provided on the test station B, and the clamping member 3 is used to clamp the fixing fixture 2 to fix the pointer multimeter 1 to be tested on the test station B; a stop member 4 is also provided between the test station A and the test station B, and the stop member 4 is used to prevent the fixing fixture 2 on the test station A from moving toward the test station B; the test completion station C is provided with a sensor 5 and a limit member 6 at one end away from the test station B. When the sensor 5 detects the pointer multimeter 1 to be tested, the limit member 6 limits the pointer multimeter 1 to be tested, and the sensor 5 sends a stop rotation instruction to the control unit to control the conveyor belt to stop rotating.

[0060] In this embodiment, if Figure 1As shown, by setting a clamping member 3 on the test station B to clamp and fix the fixing fixture 2, it is ensured that the pointer multimeter 1 to be tested always remains stable and motionless during the entire calibration process, which is helpful for the visual recognition unit to accurately read the dial reading and ensure the consistency and accuracy of the calibration action; the stop member 4 is set between the test station A and the test station B, which can effectively prevent the pointer multimeter 1 to be tested that has not completed the previous preparation from entering the test station B in advance, or there are multiple pointer multimeters 1 to be tested in the test station B, which will cause confusion in the calibration results and affect the reliability and stability of the system; and the sensor 5 is set at one end of the test completion station C to accurately sense the position of the product to be tested and promptly report it to the control unit. The control unit sends a stop command to ensure that each product to be inspected can accurately reach the predetermined position for the next processing. By establishing a feedback mechanism, the accuracy of the conveyor belt motion control is effectively improved and the position error is reduced. Among them, the sensor 5 can be set in cooperation with the limiter 6. When the sensor 5 detects the pointer multimeter 1 to be inspected, the limiter 6 can limit the pointer multimeter 1 to be inspected and stop the pointer multimeter 1 to be inspected from continuing to move. Finally, based on the stopper 4, sensor 5 and limiter 6 provided by the present application and controlled by automation, the system can automatically adjust the work process without manual intervention, which speeds up the calibration cycle and improves the overall calibration efficiency of the system.

[0061] Specifically, in the above embodiment, the calibration unit includes a six-axis robotic arm, a servo electric claw, a driving power supply and a programmable controller; the servo electric claw is arranged at the end of the six-axis robotic arm, and the driving power supply supplies power to the six-axis robotic arm and the servo electric claw respectively; the programmable controller is respectively connected to the six-axis robotic arm, the servo electric claw and the control unit, for receiving the control panel position information sent by the control unit, and based on the control panel position information, controlling the six-axis robotic arm to drive the servo electric claw to reach above the control panel of the pointer multimeter 1 to be inspected, and controlling the servo electric claw to perform a calibration action on the control panel of the pointer multimeter 1 to be inspected, and performing a reading action on the dial of the pointer multimeter 1 to be inspected through the dial recognition detection module 7, wherein the calibration action includes controlling the servo electric claw to adjust the voltage and current zeroing knob positions and the resistance zeroing knob positions on the control panel respectively to achieve voltage zeroing, current zeroing and resistance zeroing, and the reading action includes forward reading of the voltage gear and current gear on the dial, and reverse reading of the resistance gear.

[0062] In this embodiment, if Figure 3As shown, the six-axis robot arm provides six degrees of freedom of motion and can flexibly adjust the position and posture to ensure that the servo electric claw can accurately reach the top of the control panel of the pointer multimeter 1 to be tested and perform the required calibration action; the servo electric claw is set at the end of the robot arm, with fast response characteristics and high-precision control capabilities, and can quickly and accurately complete operations such as grasping and releasing, which speeds up the calibration speed and improves the overall work efficiency; the programmable controller receives the position information sent from the control unit and parses it into specific motion instructions to achieve precise control of the six-axis robot arm and the servo electric claw, and finally forms a closed-loop control system to ensure that the servo electric claw is consistent and accurate every time it operates.

[0063] Specifically, a six-axis robotic arm is used in conjunction with a servo electric claw to complete the calibration action, that is, the voltage and current zeroing knob positions are adjusted to complete the voltage zeroing and current zeroing, and the resistance zeroing is completed by adjusting the resistance zeroing knob position. At the same time, the dial recognition and detection module 7 is used to read the dial of the pointer multimeter 1 to be inspected, including forward readings of the voltage and current gears, and reverse readings of the resistance gear. The present application performs the zeroing operation through the cooperation of a six-axis robotic arm and a servo electric claw. The six-axis robotic arm can quickly and accurately locate and adjust the knob position, and the servo electric claw can provide very fine control to ensure that each adjustment can achieve the required level of accuracy, shortening the time required for the calibration steps and reducing errors caused by human factors. The dial recognition and detection module 7 can automatically identify and record the pointer position, avoiding subjective deviations caused by human eye observation, and can not only read the voltage and current gears forward, but also read the resistance gear in reverse, providing a more comprehensive data verification method, further improving the reliability of the calibration results.

[0064] Furthermore, the calibration unit also includes a clamping jaw tooling and / or a test lead tooling; the clamping jaw tooling is arranged on the servo electric claw, and is used to adjust the knob gear on the control panel of different types of pointer multimeters 1 to be tested; and / or, the test lead tooling is arranged on the servo electric claw, and is used to insert the test lead into the jack on the control panel of different types of pointer multimeters 1 to be tested.

[0065] In this embodiment, a clamping jaw fixture and / or a test pen fixture can be set on the servo electric claw according to the test requirements, wherein the clamping jaw fixture is used to adjust the knob gear on the control panel of different types of pointer multimeters, so that the system can flexibly cope with a variety of different types of multimeters, without the need to design special tools for each specific model, which greatly improves the versatility and adaptability of the system; and the test pen fixture is used to insert the test pen into different types of jacks, ensuring the accuracy and stability of the test connection, and is suitable for pointer multimeters with various interface specifications; the clamping jaw fixture and the test pen fixture are both installed on the servo electric claw, and precise control is used to achieve precise operation of the knob and jack, which not only ensures the accuracy of each The consistency and accuracy of each operation is improved, and operational errors caused by human factors are reduced. In the specific operation process, the test lead tooling is fixed at the side and is grabbed by the six-axis robotic arm and servo electric claw, and is automatically returned to the starting position after the calibration is completed. The automated grabbing and insertion actions effectively reduce the need for manual intervention, speed up the calibration process, and improve the overall work efficiency. In addition, by setting up the gripper tooling and the test lead tooling, the system can perform more complex calibration tasks, such as simulating manual adjustment of knobs, inserting test leads for measurement, etc. It can also perform some simple adjustments or calibration work, which expands the application range and applicability of the system.

[0066] Specifically, in the above embodiment, Figure 4 As shown, the visual recognition unit also includes a controllable light source matrix 9; the controllable light source matrix 9 is arranged between the dial recognition detection module 7 and the pointer multimeter 1 to be tested, and between the control panel recognition detection module 8 and the pointer multimeter 1 to be tested, for providing a calibration light source.

[0067] In this embodiment, the controllable light source matrix 9 can provide uniform and stable lighting, reduce shadows and reflections, ensure the acquisition of clear, high-contrast images, and accurately read the pointer position on the dial and the information on the control panel; by adjusting the intensity, angle and color of the light source, the lighting conditions can be optimized for different types of multimeters and different calibration tasks, thereby improving the accuracy and reliability of the visual recognition unit; the controllable light source matrix 9 can be programmed and controlled according to specific needs to adapt to various calibration environments and requirements, thereby increasing the versatility and adaptability of the system; and a stable light source can help reduce the impact of external light changes on the calibration process, thereby enhancing the robustness and stability of the system, especially in the presence of external light source interference.

[0068] Among them, the controllable light source matrix 9 is specifically rectangular, can provide light sources on four sides, and can be fixed by a bracket; the dial recognition and detection module 7 and the control panel recognition and detection module 8 have the same structure, specifically including a 2000W pixel industrial camera and a 50mm lens to meet the visual distance of about 700mm to clearly identify the characteristics required for the calibration of the multimeter. Among them, the dial recognition and detection module 7 also includes automatic reading of the model, manufacturer and factory number of the instrument being tested for the recognition of the dial. When the handwritten version of the number is not clearly read, a screenshot can be used to upload it to the original record and certificate report.

[0069] Specifically, in the above embodiment, the control unit includes an electronic control module and a host computer; the electronic control module includes an inlet and outlet unit control system, a visual recognition unit control system and a calibration unit control system, which are respectively used to control the actions of the inlet and outlet unit, the visual recognition unit and the calibration unit; the host computer runs automatic calibration software for a pointer multimeter, and the automatic calibration software for a pointer multimeter is used to control the inlet and outlet unit control system, the visual recognition unit control system and the calibration unit control system to work together to realize automatic calibration of the pointer multimeter 1 to be inspected and automatic acquisition of the calibration results.

[0070] In this embodiment, if Figure 5 As shown, the control unit is the core component of the system, specifically including an electronic control module and a host computer, wherein the electronic control module is specifically controlled and managed by a high-performance industrial computer, and can be divided into a feeding and discharging unit control system, a visual recognition unit control system and a calibration unit control system based on the functions realized, for realizing the operation control of each functional unit; the host computer is used to run the automatic calibration software of the pointer multimeter, and the software can automatically identify the gear position and reading of the pointer multimeter 1 to be tested, control the coordinated work of each functional unit, and process the calibration results, and automatically generate a calibration report for the pointer multimeter 1 to be tested.

[0071] Furthermore, the automatic calibration software of the pointer multimeter is integrated with a calibration item switching module and a standard source, wherein the calibration item switching module includes current calibration items, voltage calibration items and resistance calibration items, and the standard source is used to provide an electrical signal reference for the calibration items; the host computer controls the calibration unit based on the standard source and the calibration item switching module to perform one of the current item calibration, voltage item calibration or resistance item calibration on the control panel of the pointer multimeter 1 to be inspected, and switches.

[0072] In this embodiment, the calibration item switching module is specifically an AVΩ switching module, which is a key component in the multimeter calibration system, and is used to automatically select and switch different measurement functions of the pointer multimeter 1 to be tested. Among them, A represents the current calibration item, V represents the voltage calibration item, and Ω represents the resistance calibration item. In the system provided in this application, the main function of the AVΩ switching module is to perform an automated test process, which can realize automatic switching of different measurement functions, and can complete the conversion between different measurement modes such as current to voltage and resistance without manual intervention, thereby effectively improving the calibration efficiency; in addition to being able to switch between different measurement types, the AVΩ switching module can also support switching between multiple ranges under the same measurement type. For example, in the voltage calibration item, it can automatically select Select a suitable voltage range to meet the actual needs of the object under test; at the same time, the AVΩ switching module will also be guided by the visual recognition unit, the visual recognition unit identifies the current gear setting of the pointer multimeter 1 to be tested, and then sends instructions to the AVΩ switching module according to the preset calibration program to adjust it to the required measurement function and range. Among them, the gear position in the voltage calibration item and the current calibration item is clockwise increasing, and the gear position in the resistance calibration item is counterclockwise increasing. Therefore, in the voltage calibration item and the current calibration item, the pointer needs to be read in the forward direction, and in the resistance calibration item, the pointer needs to be read in the reverse direction. At the same time, the calibration item also includes adjusting the voltage and current zero adjustment knob gear position and the resistance zero adjustment knob gear position on the control panel to achieve voltage zero adjustment, current zero adjustment and resistance zero adjustment.

[0073] The standard source is a key component in the multimeter calibration system, which is used to provide known and accurate electrical signals, such as voltage, current or resistance values, for calibrating and verifying the accuracy of the pointer multimeter 1 to be tested. The standard source plays a vital role in the automated calibration process, ensuring that each measurement function can be accurately tested and adjusted; specifically in this application, the AVΩ switching module can also work closely with the standard source. When switching to a specific measurement function, the standard source outputs the corresponding standard value for comparison and calibration.

[0074] Specifically, in the above embodiment, Figure 6 As shown, the intelligent automatic calibration system of the pointer multimeter also includes a chassis 10; the feed and discharge unit, the visual recognition unit, the calibration unit and the control unit are arranged in the chassis 10, and the two sides of the chassis 10 are respectively provided with a feed port and a discharge port, the feed end of the feed and discharge unit is arranged at the feed port, and the discharge end of the feed and discharge unit is arranged at the discharge port; a control panel is arranged on the front of the chassis 10, and the control panel is electrically connected to the control unit; an observation window 11 is also opened on the front of the chassis 10, and a transparent protective plate is arranged on the observation window 11.

[0075] In this embodiment, the feeding and discharging units, visual recognition unit, calibration unit and control unit in the system are integrated into a chassis 10, making the entire system more compact, reducing the footprint, and facilitating management and maintenance. The modular design of each functional unit also simplifies the installation and debugging process, and the entire calibration process from feeding to discharging is fully automated, reducing manual intervention and improving work efficiency. The design of the chassis 10 provides physical isolation to protect the internal precision instruments from the external environment, while also preventing operators from contacting moving parts, increasing safety and providing an additional safety barrier. A control panel is provided on the front of the chassis 10, which can be directly connected to the control unit, so that the user can easily manage the entire calibration process through an intuitive operating interface. A transparent protective panel is provided on the observation window 11 on the front of the chassis 10, allowing the operator to observe the internal working status without opening the chassis 10, ensuring safety while also facilitating monitoring.

[0076] Specifically, the control panel on the front of the chassis 10 includes a human-machine operation interface and mechanical operation buttons, so that the operator can control the entire test process on the front of the chassis 10. Among them, the visual recognition test software carried by the control center adopts functional modularization, such as Figure 7 As shown in the figure, combined with its graphical interface, it simplifies the complexity of programming and transforms complex programming concepts into an intuitive, drag-and-drop interface, thereby improving flexible business logic; it can also develop visual algorithms, PLC communication, instrument communication, robot communication, and data management into a single functional module through platform standardization; it can customize programming scripts to achieve secondary development of the system; and it adopts a flexible and configurable underlying building block architecture mode to reduce the coupling of functional modules and improve the configurability, reusability and independence of single functional modules; further, it builds a business platform according to business needs, combines the concept of digital twins, and quickly builds a full range of The business layer can be changed flexibly to meet the needs of use; the interface layer is a human-computer exchange layer, which includes the main operation interface, visual photography interface, parameter interface, manual interface, and log interface; the functions implemented by the software include the action control of the six-axis robotic arm in the visual recognition unit and the calibration unit and some other control hardware, and can also control the output of the standard source, and output reports on the test values ​​and results; the specific control logic is: first judge the initial state of the pointer multimeter 1 to be tested, then control the automatic zeroing of the pointer multimeter 1 to be tested, and finally compare the different values ​​of each gear of the pointer multimeter 1 to be tested with the standard source to make measurement judgments and output test values.

[0077] Furthermore, an air cooling device 12 is provided on the top of the chassis 10 , and the air cooling device 12 is used to dissipate heat inside the chassis 10 ; the chassis 10 is also provided with an electrical input port and an external expansion port.

[0078] In this embodiment, the top of the chassis 10 is provided with an air cooling device 12 for dissipating heat inside the chassis 10, so that the heat generated inside the chassis 10 can be discharged in time, ensuring the stability of the internal environment of the chassis 10; at the same time, the chassis 10 is provided with quick-connect electrical input ports and external expansion ports, etc., to facilitate subsequent expansion operations.

[0079] Obviously, those skilled in the art can 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. An intelligent automatic calibration system for pointer multimeter, characterized in that: It includes feeding and discharging unit, visual recognition unit, verification unit and control unit; The material loading and unloading unit is used to carry the pointer multimeter (1) to be tested; The visual recognition unit is connected to the control unit, and comprises a dial recognition detection module (7) and a control panel recognition detection module (8); the dial recognition detection module (7) is arranged above the dial of the pointer multimeter (1) to be tested, and is used to recognize and record the metrological identification information required for the cover of the calibration certificate of the pointer multimeter (1) to be tested; the control panel recognition detection module (8) is arranged above the control panel of the pointer multimeter (1) to be tested, and is used to obtain the control panel position information of the pointer multimeter (1) to be tested, and send the control panel position information to the control unit, wherein the control panel position information comprises zero position knob position information, measurement gear position information and terminal recognition position information; The control unit is also connected to the calibration unit. The control unit controls the calibration unit to perform a calibration action on the control panel of the pointer multimeter (1) to be tested based on the control panel position information, and reads the dial reading of the pointer multimeter (1) to be tested through the dial recognition detection module (7) to obtain the calibration result of the pointer multimeter (1) to be tested.

2. The intelligent automatic calibration system for pointer multimeter according to claim 1 is characterized in that: The feeding and discharging unit comprises a conveyor belt, a fixing fixture (2), a stepping motor and a driver; A station to be tested, a testing station and a testing completion station are sequentially arranged along the transmission direction of the conveyor belt; The fixing fixture (2) is placed on the conveyor belt and is used to clamp and fix the pointer multimeter (1) to be tested; The control unit is connected to the driver, the driver is connected to the stepper motor, the stepper motor is connected to the conveyor belt, the control unit controls the driver to drive the stepper motor to drive the conveyor belt to rotate, so that the pointer multimeter (1) to be tested on the fixing fixture (2) moves along the transmission direction of the conveyor belt, and passes through the station to be tested, the test station and the test completion station in sequence; When the pointer multimeter (1) to be tested arrives at the testing station, the verification unit performs a verification action on the control panel of the pointer multimeter (1) to be tested.

3. The intelligent automatic calibration system for pointer multimeter according to claim 2 is characterized in that: The test station is provided with a clamping member (3), and the clamping member (3) is used to clamp the fixing fixture (2) so as to fix the pointer multimeter (1) to be tested on the test station; A stopper (4) is also provided between the station to be tested and the testing station, and the stopper (4) is used to prevent the fixing fixture (2) on the station to be tested from moving toward the testing station; A sensor (5) and a limiter (6) are provided at one end of the test completion station away from the test station. When the sensor (5) detects the pointer multimeter (1) to be tested, the limiter (6) limits the pointer multimeter (1) to be tested, and the sensor (5) sends a stop rotation instruction to the control unit to control the conveyor belt to stop rotating.

4. The intelligent automatic calibration system for pointer multimeter according to claim 1 is characterized in that: The verification unit includes a six-axis robot arm, a servo electric claw, a driving power supply and a programmable controller; The servo electric claw is arranged at the end of the six-axis robot arm, and the driving power supply supplies power to the six-axis robot arm and the servo electric claw respectively; The programmable controller is connected to the six-axis robot arm, the servo electric claw and the control unit respectively, and is used to receive the control panel position information sent by the control unit, and based on the control panel position information, control the six-axis robot arm to drive the servo electric claw to reach the top of the control panel of the pointer multimeter (1) to be inspected, and control the servo electric claw to perform a calibration action on the control panel of the pointer multimeter (1) to be inspected, and perform a reading action on the dial of the pointer multimeter (1) to be inspected through the dial recognition detection module (7), wherein the calibration action includes controlling the servo electric claw to adjust the voltage and current zeroing knob gear and the resistance zeroing knob gear on the control panel respectively to achieve voltage zeroing, current zeroing and resistance zeroing, and the reading action includes reading the voltage gear and current gear in the forward direction on the dial, and reading the resistance gear in the reverse direction.

5. The intelligent automatic calibration system for pointer multimeter according to claim 4 is characterized in that: The verification unit also includes a clamping jaw tool and / or a test lead tool; The clamping jaw tooling is arranged on the servo electric jaw and is used to adjust the knob position on the control panel of different types of pointer multimeters (1) to be tested; and / or, The test lead tooling is arranged on the servo electric claw and is used for inserting the test lead into a socket on a control panel of a pointer multimeter (1) of different types to be tested.

6. The intelligent automatic calibration system for pointer multimeter according to claim 1 is characterized in that: The visual recognition unit also includes a controllable light source matrix (9); The controllable light source matrix (9) is arranged between the dial identification detection module (7) and the pointer multimeter (1) to be tested, and between the control panel identification detection module (8) and the pointer multimeter (1) to be tested, and is used to provide a calibration light source.

7. The intelligent automatic calibration system for pointer multimeter according to claim 1 is characterized in that: The control unit includes an electric control module and a host computer; The electric control module includes a material inlet and outlet unit control system, a visual recognition unit control system and a verification unit control system, which are used to control the actions of the material inlet and outlet unit, the visual recognition unit and the verification unit respectively; The host computer runs automatic calibration software for a pointer multimeter, and the automatic calibration software for the pointer multimeter is used to control the feeding and discharging unit control system, the visual recognition unit control system and the calibration unit control system to work in coordination, so as to realize automatic calibration of the pointer multimeter (1) to be inspected and automatic acquisition of the calibration result.

8. The intelligent automatic calibration system for pointer multimeter according to claim 7 is characterized in that: The automatic calibration software of the pointer multimeter is integrated with a calibration item switching module and a standard source, wherein the calibration item switching module includes current calibration items, voltage calibration items and resistance calibration items, and the standard source is used to provide an electrical signal reference for the calibration items; The host computer controls the calibration unit to perform one of current item calibration, voltage item calibration or resistance item calibration on the control panel of the pointer multimeter (1) to be inspected based on the standard source and the calibration item switching module, and performs switching.

9. The intelligent automatic calibration system for pointer multimeter according to claim 1 is characterized in that: The pointer multimeter intelligent automatic calibration system also includes a chassis (10); The feed-in and feed-out unit, the visual recognition unit, the verification unit and the control unit are arranged in the chassis (10), and a feed port and a feed port are respectively provided on both sides of the chassis (10), the feed end of the feed-in and feed-out unit is arranged at the feed port, and the discharge end of the feed-in and feed-out unit is arranged at the discharge port; A control panel is provided on the front of the chassis (10), and the control panel is electrically connected to the control unit; The front of the chassis (10) is also provided with an observation window (11), and a transparent protective plate is provided on the observation window (11).

10. The intelligent automatic calibration system for pointer multimeter according to claim 9, characterized in that: An air cooling device (12) is provided on the top of the chassis (10), and the air cooling device (12) is used to dissipate heat inside the chassis (10); The chassis (10) is also provided with an electrical input port and an external expansion port.

Images