Intelligent calibration system device for digital multimeter

Abstract

The utility model relates to an intelligent calibration system device for a digital multimeter, and the device comprises an operation platform which comprises a platform surface and a cabinet body; the metering standard equipment is arranged on the operation table; the automatic positioning device is arranged on the table top; the collaborative robot comprises a control cabinet and a mechanical arm, and the mechanical arm is installed on the table top; a visual device is arranged at the end of the mechanical arm; the control cabinet is arranged in the cabinet body; the test line conversion connection device comprises a detection line and a detection socket. The detection socket is installed on the table top, the detection socket is connected with the metering standard equipment, and the detection line is used for connecting the detection socket and a digital multimeter to be detected; the computer is arranged on the operation table; and the controller is respectively connected with the metering standard equipment, the automatic positioning device and the control cabinet. The condition of detection errors or data recording errors during manual detection is avoided; and the detection accuracy and the detection efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of calibration technology for handheld digital multimeters, and in particular to an intelligent calibration system device for digital multimeters. Background Technology

[0002] A digital multimeter, commonly known as a digital multimeter, is a general-purpose instrument for measuring electrical parameters in the field. It is widely used in electrical measurement instruments across various industries. Digital multimeters are also extensively used in railway rolling stock, locomotive, engineering, electrical, and vehicle manufacturing sectors. From simple electromechanical equipment testing and maintenance to complex applications in power supply systems, communications, and signaling departments, it is an indispensable tool in railway inspection work. Digital multimeters play a crucial role in measuring fundamental electrical parameters and are among the most basic and important instruments ensuring the safe operation of railways.

[0003] Multimeters are crucial measuring instruments in railway maintenance and inspection work. Their accuracy directly impacts the quality and safety of railway inspections. Therefore, they are managed as measuring instruments and require regular calibration to ensure accuracy and reliability. Standards require calibration of five parameters on digital multimeters: DC voltage, DC current, AC voltage, AC current, and resistance. Each calibration requires calibrating each range, resulting in calibration points ranging from dozens to hundreds, with some high-precision digital multimeters requiring thousands. Furthermore, to meet practical field needs, error calculations are performed on each calibrated measurement point during calibration to determine compliance and pass / fail status. Consequently, calibrating a single digital multimeter is time-consuming, involves large amounts of data, and is inefficient. Human error during data processing can easily lead to problems. Additionally, unlike some measuring instruments, digital multimeters are not standardized, resulting in significant differences and numerous models purchased by different units. The inconsistent range settings across different models of digital multimeters during calibration can lead to errors and low calibration efficiency. Therefore, automatic calibration is necessary to reduce the error rate and improve calibration efficiency.

[0004] The prior art CN116359816A discloses an automatic calibration device and method for a digital multimeter, comprising the following steps: connecting a multi-function calibration source to the digital multimeter under test; fixing the digital multimeter under test; a robot gripping component gripping the test lead head and inserting it into the wiring port of the digital multimeter under test; the robot rotating the knob of the digital multimeter under test to the specified range parameter; the multi-function calibration source providing preset electrical parameter values ​​for the digital multimeter under test; the robot taking pictures of the dial of the digital multimeter under test to obtain the reading information of the digital multimeter; and calibrating the deviation of the digital multimeter based on the reading information and the rated information of the digital multimeter under test.

[0005] However, the location, layout, and number of jacks on digital multimeters vary. Furthermore, some digital multimeters cannot connect multiple sets of jacks simultaneously; only one set can be connected at a time. Otherwise, the multimeter will alarm and fail to calibrate. Additionally, the jack spacing on digital multimeters used for calibration is relatively small. Moreover, because the test lead tip is cylindrical with a slight bevel, it increases the difficulty of gripper control. Using the device described in this patented technology, displacement of the test lead tip can easily occur, leading to connection failure or even damage to the connector. This further results in inaccurate calibration test data. Summary of the Invention

[0006] To address the shortcomings of the existing technology, this invention provides an intelligent calibration system for digital multimeters. This system utilizes the coordinated operation of components such as an automatic positioning device, a collaborative robot, and a test lead conversion and connection device to perform testing on various models of digital multimeters. Specifically, the technical solution of this invention to achieve the above objective is as follows:

[0007] The intelligent calibration system device for digital multimeters includes:

[0008] Workbench, including the countertop and cabinet;

[0009] A metrological standard device is installed on the operating table to provide measurement signals;

[0010] An automatic positioning device is installed on the platform for positioning the digital multimeter under test.

[0011] A collaborative robot includes a control cabinet and a robotic arm. The robotic arm is mounted on the platform and is used to adjust the buttons of the digital multimeter under test and to plug and unplug test lines. A vision device is provided at the end of the robotic arm for collecting the readings of the digital multimeter under test. The control cabinet is installed inside the cabinet and is used to send operation signals to the robotic arm.

[0012] A test lead conversion connection device includes a test lead and a test socket; the test socket is installed on the table surface and is connected to the metrological standard equipment; the test lead is used to connect the test socket to the digital multimeter to be tested.

[0013] A computer is installed on the operating table and connected to the metrological standard equipment, the automatic positioning device, and the control cabinet.

[0014] Furthermore, the automatic positioning device includes a vertical positioning component, a horizontal positioning component, and a cover plate; the vertical positioning component is arranged along the length direction of the digital multimeter under test and configured as an openable structure to restrict the movement of the digital multimeter under test along its length direction; the horizontal positioning component is arranged along the width direction of the digital multimeter under test and configured as an openable structure to clamp the digital multimeter under test along its width direction; the vertical positioning component includes a positioning plate and a limiting plate, the positioning plate being fixedly installed on the table surface; the limiting plate is movable along the length direction of the digital multimeter under test, and in use, a gap is left between the limiting plate and the top of the digital multimeter under test for the digital multimeter under test to be uprighted; the vertical positioning component also includes a limiting plate driving component connected to the limiting plate, used to drive the limiting plate to move along the length direction of the digital multimeter under test; the cover plate covers the horizontal positioning component and the vertical positioning component, and the plate surface has an oblong hole.

[0015] Furthermore, the lateral positioning component includes a first positioning unit and a second positioning unit; the first positioning unit corresponds to the lower part of the digital multimeter under test and is configured to open and close in the width direction of the digital multimeter under test; the second positioning unit corresponds to the upper part of the digital multimeter under test and is configured to open and close in the width direction of the digital multimeter under test; the first positioning unit and the second positioning unit operate sequentially to guide the digital multimeter under test into the correct position and then clamp and fix the digital multimeter under test.

[0016] Furthermore, the first positioning unit and the second positioning unit have the same structure, both including positioning posts and positioning drive components; there are two positioning posts, which are located on both sides of the digital multimeter under test; the positioning drive component is connected to the two positioning posts and is used to drive the two positioning posts to open and close.

[0017] Furthermore, the output end of the positioning drive is connected to a positive and negative threaded rod, and the two positioning posts are respectively set at both ends of the positive and negative threaded rod; the positioning post includes a mounting shaft and a positioning sleeve; the mounting shaft is connected to the positive and negative threaded rod through a base; the positioning sleeve is assembled on the mounting shaft through a bearing so that the positioning sleeve rotates around its axis.

[0018] Furthermore, the robotic arm end is provided with a V-shaped gripper; the detection line is provided with detection plugs at both ends, the detection plugs are banana-shaped, and the upper end of the detection plug is provided with a V-shaped groove for cooperating with the V-shaped gripper; the detection line includes a first detection line and a second detection line; the detection socket is provided with a plurality of detection holes that match the detection plugs; during detection, the detection plug at one end of the detection line is inserted into the detection socket, and the detection plug at the other end is inserted into the detection hole of the digital multimeter under test, for transmitting the measurement signal from the detection socket to the digital multimeter under test.

[0019] Furthermore, the detection plugs of the first and second detection lines are set at different heights to accommodate the digital multimeter under test with narrow detection hole spacing and to prevent clamping failure during insertion and removal; the V-grooves of the detection plugs of the first and second detection lines are located at different heights, and the V-groove on the higher detection plug is higher than the top of the lower detection plug, which facilitates gripping by the V-shaped claw.

[0020] Furthermore, the V-shaped gripper consists of two clamping plates, which are set to be perpendicular to the operating table surface. The opposing surfaces of the two clamping plates are provided with V-shaped protrusions that match the V-shaped grooves at the upper end of the detection plug. When gripping, the V-shaped protrusions engage with the V-shaped grooves to achieve stable gripping.

[0021] Furthermore, it also includes a temporary socket, installed in the middle of the automatic positioning device. The temporary socket is provided with multiple temporary sockets for storing the test plugs of the first and second test lines that are inserted into the test holes of the digital multimeter under test when not in operation. The test socket and the temporary socket are provided with multiple guide blocks, and the upper end of the guide blocks is provided with a chamfer to improve the accuracy of the test plug when it is inserted into the test socket.

[0022] Furthermore, the cabinet is equipped with casters with height-adjustable brackets at the four corners of its bottom; ventilation openings and cable routing holes are provided on the sides of the cabinet; a light source is also provided on the robotic arm to illuminate the acquisition area of ​​the vision device; and a push rod is provided at the end of the robotic arm to press the button of the digital multimeter to be tested.

[0023] The principle of this utility model is as follows:

[0024] During the calibration and testing process, the digital multimeter 6 is placed on the automatic positioning device 3, with its upper and lower ends roughly aligned with the limiting plate 312 and the positioning plate 311, respectively. The positioning drive 322 drives the two positioning posts 321 of the first positioning unit to close along the width direction of the digital multimeter 6, clamping it in place. Then, the positioning drive 322 drives the two positioning posts 321 of the second positioning unit to close along the width direction of the digital multimeter 6, clamping it in place as well. After clamping by the second positioning unit, the four positioning posts 321 adjust the digital multimeter 6 to a preset horizontal position. During this adjustment, the positioning sleeve 3212, which contacts the digital multimeter 6, rotates as the digital multimeter 6 moves. Then, the limiting plate drive 313 drives the limiting plate 312 to move towards the positioning plate 311, pushing the digital multimeter 6 onto the positioning plate 311 and clamping it in place, thus adjusting the digital multimeter 6 to a preset vertical position. During this adjustment, the positioning sleeve 3212 rotates as the digital multimeter 6 moves. In the initial state, one end of the test line 51, the test plug 52, is inserted into the test socket 53, and the other end is inserted into the temporary socket 54. After the digital multimeter 6 is positioned, the robotic arm 41 pulls the test plug 52 out of the temporary socket 541 and inserts it into the socket of the digital multimeter 6, connecting the digital multimeter 6 to the metrological standard device 2 through the test socket 53 and the test line 51. Then, the robotic arm 41 controls the V-shaped gripper 412 to rotate the rotary button on the digital multimeter 6 or press the button on the digital multimeter 6 to adjust it to the item to be measured. Finally, the reading of the digital multimeter 6 is acquired by the vision device 411. The light source is used to illuminate the reading area of ​​the digital multimeter 6 for easy visual acquisition. The V-shaped protrusion 4122 matches the V-shaped groove 521 so that the V-shaped gripper 412 can stably grasp the test plug 52 and prevent the test plug from slipping. The detection plugs 52 of the first detection line 51 and the second detection line 51 are set at different heights. The V-grooves 521 of the detection plugs 52 of the first detection line 51 and the second detection line 51 are located at different heights. The V-groove 521 on the detection plug 52 with the higher height is higher than the top of the detection plug 52 with the lower height. When the sockets on the digital multimeter 6 are close together, the two inserted detection plugs 52 are too close. The detection plugs 52 with different heights can ensure that the V-shaped gripper 412 can accurately grip the one with the higher position first, and then grip the other one, thereby improving the gripping accuracy.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (i) The system can automatically test digital multimeters according to a preset testing process, avoiding errors in testing or data recording caused by complicated testing steps and large amounts of data during manual testing; thus improving testing accuracy and efficiency.

[0027] (ii) The invention can adapt to different models of digital multimeters through an automatic positioning device, reducing calibration failures or errors caused by model differences, thereby improving calibration efficiency and better handling the calibration work of a large number of digital multimeters.

[0028] (III) This utility model can facilitate the mechanical arm to grip and insert the specially designed detection plug with height difference and the corresponding gripper, avoiding the situation where the calibration test data is not accurate due to the failure of insertion or damage of the connector, thereby ensuring the safety of the calibration process and the accuracy of the calibration test data. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0030] Figure 2 This is a schematic diagram of the automatic positioning device described in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the cover plate structure according to an embodiment of the present utility model;

[0032] Figure 4 This is a schematic diagram of the lateral positioning component structure described in an embodiment of the present utility model;

[0033] Figure 5 This is a schematic diagram of the vertical positioning component structure according to an embodiment of the present utility model;

[0034] Figure 6 This is a top view of the automatic positioning device described in an embodiment of the present utility model;

[0035] Figure 7 This is a schematic diagram of the working state of the automatic positioning device described in this embodiment of the utility model;

[0036] Figure 8 for Figure 7 Enlarged view of section B;

[0037] Figure 9 This is a schematic diagram of the robotic arm structure described in an embodiment of the present invention;

[0038] Figure 10 This is a schematic diagram of the V-shaped gripper pressing the buttons of the digital multimeter according to an embodiment of the present invention;

[0039] Figure 11 This is a schematic diagram of the V-shaped gripper rotating digital multimeter knob described in an embodiment of the present invention;

[0040] Figure 12 This is a schematic diagram of the V-shaped gripper inserting and removing the detection plug according to an embodiment of the present invention;

[0041] Figure 13 This is a schematic diagram of the robotic arm end structure according to an embodiment of the present invention;

[0042] Figure 14 This is a cross-sectional view of the end structure of the robotic arm according to an embodiment of the present invention;

[0043] Figure 15 This is a schematic diagram of the clamping plate structure described in an embodiment of the present utility model;

[0044] Figure 16 This is a schematic diagram of the push rod pressing the button of the digital multimeter according to an embodiment of the present invention;

[0045] Figure 17 This is a schematic diagram of the detection line structure described in an embodiment of the present utility model;

[0046] Figure 18 This is a schematic diagram of the detection plug structure according to an embodiment of the present utility model;

[0047] Figure 19 This is a schematic diagram of the detection socket structure described in an embodiment of the present utility model;

[0048] Figure 20 This is a schematic diagram of the temporary socket structure described in an embodiment of the present utility model;

[0049] Figure 21 This is a schematic diagram showing the state when the detection line is inserted into the detection socket and the temporary socket according to an embodiment of the present invention;

[0050] In the diagram: 1—operating table, 11—countertop, 12—cabinet, 13—caster wheels, 14—ventilation opening, 15—cable hole;

[0051] 2—Metrological standard equipment;

[0052] 3—Automatic positioning device; 31—Vertical positioning component; 311—Positioning plate; 312—Limiting plate; 313—Limiting plate drive component; 32—Horizontal positioning component; 321—Positioning column; 3211—Mounting shaft; 3212—Positioning sleeve; 322—Positioning drive component; 323—Positive and negative threaded rod; 33—Cover plate.

[0053] 4—Collaborative robot, 41—Robotic arm, 411—Vision device, 412—V-shaped gripper, 4121—Clamping plate, 4122—V-shaped protrusion, 413—Actuating lever, 42—Control cabinet;

[0054] 5—Test lead conversion connection device, 51—Test lead, 52—Test plug, 521—V-groove, 53—Test socket, 531—Test jack, 54—Temporary socket, 541—Temporary jack, 55—Guide block, 551—Chamfer;

[0055] 6—Digital Multimeter. Detailed Implementation

[0056] like Figures 1-21 As shown, the embodiments of this utility model are as follows:

[0057] A digital multimeter intelligent calibration system includes an operating console 1, a metrological standard device 2, an automatic positioning device 3, a collaborative robot 4, a test lead conversion and connection device 5, and a computer.

[0058] The control panel 1 includes a tabletop 11 and a cabinet 12. Each of the four corners of the cabinet 12 is equipped with casters 13 with height-adjustable supports. When the control panel 1 moves to a preset position, the height of the height-adjustable supports is lowered to contact the ground, supporting the control panel 1 and allowing the casters 13 to lift off the ground, thus positioning the control panel 1. The cabinet 12 has ventilation openings 14 and cable management holes on its sides. The power cords of the equipment inside the cabinet 12 are connected to an external power source through cable management holes 15.

[0059] The collaborative robot 4 includes a control cabinet 42 and a robotic arm 41. The robotic arm 41 is mounted on the platform 11, and the control cabinet 42 is installed inside the cabinet 12. The movement of the robotic arm 41 is controlled by the control cabinet 42. The robotic arm 41 uses six joints to achieve basic spatial movement. The end of the robotic arm 41 is provided with a vertically downward V-shaped gripper 412 and a downwardly inclined cylindrical push rod 413. The V-shaped gripper 412 consists of two clamping plates 4121, which are set perpendicular to the platform 11 of the operating table 1. V-shaped protrusions 4122 are provided on the opposite surfaces of the two clamping plates 4121. The V-shaped gripper 412 is used for plugging and unplugging the test plug and adjusting the knob of the digital multimeter 6 under test. The push rod 413 or the V-shaped gripper 412 can press the buttons on the digital multimeter 6 under test via the movement of the robotic arm 41. A vision device 411 is also installed on the robotic arm 41 to collect the readings of the digital multimeter 6 under test. The vision device 411 uses a 2.5D high-resolution industrial camera and is equipped with a dedicated LED light source module to illuminate the acquisition area of ​​the vision device 411. The vision device 411 can accurately identify changes in scene height and tilt, with a spatial compensation accuracy of ±0.26mm. It is equipped with a comprehensive error-proofing detection algorithm, enabling rapid visual positioning, measurement, detection, and recognition applications. The readings of the digital multimeter 6 under test are collected by the device installed at the end of the robotic arm 41.

[0060] The metrology standard device 2, also known as the multi-functional calibration source, is installed inside the cabinet 12 to provide measurement signals.

[0061] An automatic positioning device 3 is installed on the table 11 for positioning the digital multimeter 6 to be tested. The automatic positioning device 3 includes a vertical positioning component 31, a horizontal positioning component 32, and a cover plate 33. The vertical positioning component 31 is arranged along the length of the digital multimeter 6 and is configured as an openable structure to restrict the movement of the digital multimeter 6 along its length. The vertical positioning component 31 includes a positioning plate 311, a limiting plate 312, and a limiting plate drive component 313 connected to the limiting plate 312, for driving the limiting plate 312 to move along the length of the digital multimeter 6. The positioning plate 311 is fixedly installed on the table 11; the limiting plate 312 can move along the length of the digital multimeter 6. In use, a gap is left between the limiting plate 312 and the top of the digital multimeter 6 to allow the digital multimeter 6 to be aligned. The lateral positioning component 32 is arranged along the width direction of the digital multimeter 6 to be tested and is configured as an openable structure for clamping the digital multimeter 6 to be tested along the width direction. The lateral positioning component 32 includes a first positioning unit and a second positioning unit; the first positioning unit corresponds to the lower part of the digital multimeter 6 to be tested and is configured to open and close along the width direction of the digital multimeter 6 to be tested; the second positioning unit corresponds to the upper part of the digital multimeter 6 to be tested and is configured to open and close along the width direction of the digital multimeter 6 to be tested; the first positioning unit and the second positioning unit operate sequentially to guide the digital multimeter 6 to be tested and clamp and fix it. The first positioning unit and the second positioning unit have the same structure, both including positioning posts 321 and positioning drive members 322; there are two positioning posts 321, which are located on both sides of the digital multimeter 6 to be tested; the positioning drive members 322 are connected to the two positioning posts 321 and are used to drive the two positioning posts 321 to open and close. The output end of the positioning drive 322 is connected to a positive and negative threaded rod 323, and two positioning posts 321 are respectively set at both ends of the positive and negative threaded rod 323. The positioning post 321 includes a mounting shaft 3211 and a positioning sleeve 3212. The mounting shaft 3211 is connected to the positive and negative threaded rod 323 through a base. The positioning sleeve 3212 is mounted on the mounting shaft 3211 through a bearing so that the positioning sleeve 3212 can rotate around its axis. A cover plate 33 covers the horizontal positioning component 32 and the vertical positioning component 31. The plate surface has an oblong hole for the components of the vertical positioning component 31 and the horizontal positioning component 32 to pass through.

[0062] The test lead conversion connection device 5 includes a test lead 51, a test socket 53, and a temporary socket 54. The test socket 53 and the temporary socket 54 are installed on the table 11. The temporary socket 54 is installed in the middle of the automatic positioning device 3. The temporary socket 54 is provided with multiple temporary insertion holes 541 for storing the test plugs 52 of the first test lead 51 and the second test lead 51 that are inserted into the test holes of the digital multimeter 6 to be tested when not in operation. The test socket 53 is connected to the metrological standard equipment 2. The test lead 51 is used to connect the test socket 53 and the digital multimeter 6 to be tested. The test lead 51 is provided with test plugs 52 at both ends. The test plugs 52 are banana-shaped. The upper end of the test plug 52 is provided with a V-groove 521 that cooperates with the V-shaped gripper 412. When gripping, the V-shaped protrusion 4122 engages with the V-groove 521 to achieve stable gripping. The detection line 51 includes a first detection line 51 and a second detection line 51; the detection socket 53 is provided with a plurality of detection holes 531 that match the detection plugs 52; during testing, the detection plug 52 at one end of the detection line 51 is inserted into the detection socket 53, and the detection plug 52 at the other end is inserted into the detection hole of the digital multimeter 6 under test, for transmitting the measurement signal from the detection socket 53 to the digital multimeter 6 under test. The detection plugs 52 of the first detection line 51 and the second detection line 51 are set at different heights to accommodate the narrow spacing of the detection holes in the digital multimeter 6 under test, preventing clamping failure during insertion and removal. The V-grooves 521 of the detection plugs 52 of the first detection line 51 and the second detection line 51 are located at different heights, and the V-grooves 521 on the higher detection plug 52 are higher than the top of the lower detection plug 52, which facilitates gripping by the V-shaped claws 412. Multiple guide blocks 55 are provided on the test socket 53 and the temporary socket 54. The upper end of the guide block 55 is provided with a chamfer 551 to improve the accuracy of the test plug 52 when it is inserted into the test socket 531.

[0063] The computer includes a host, operating devices, and a monitor. The host is placed inside the cabinet 12 and is connected to the metrological standard equipment 2, the automatic positioning device 3, and the control cabinet 42, respectively. The monitor and operating devices are installed on the operating table 1.

[0064] During the calibration and testing process, the tester first places the digital multimeter 6 on the automatic positioning device 3, aligning its upper and lower ends roughly with the limiting plate 312 and the positioning plate 311, respectively. In the initial state, there is a gap between the limiting plate 312 and the top of the digital multimeter 6 for the digital multimeter 6 to rotate. The positioning drive 322 drives the two positioning posts 321 of the first positioning unit to close along the width direction of the digital multimeter 6, clamping the digital multimeter 6. Then, the positioning drive 322 drives the two positioning posts 321 of the second positioning unit to close along the width direction of the digital multimeter 6, clamping the digital multimeter 6. After the second positioning unit clamps the digital multimeter 6, the four positioning posts 321 adjust the digital multimeter 6 to the preset horizontal position. During the adjustment process, the positioning sleeve 3212 that contacts the digital multimeter 6 rotates as the digital multimeter 6 moves. Then, the limiting plate drive 313 drives the limiting plate 312 to move towards the positioning plate 311, pushing the digital multimeter 6 onto the positioning plate 311 and clamping it, thus adjusting the digital multimeter 6 to a preset vertical position. During the adjustment process, the positioning sleeve 3212 rotates as the digital multimeter 6 moves. In the initial state, one end of the detection line 51, the detection plug 52, is inserted into the detection socket 53, and the other end is inserted into the temporary socket 54. After the digital multimeter 6 is positioned, the robotic arm 41 pulls the detection plug 52 out of the temporary socket 541 and inserts it into the digital multimeter 6 socket, connecting the digital multimeter 6 to the metrological standard device 2 through the detection socket 53 and the detection line 51. Then, the robotic arm 41 controls the V-shaped gripper 412 to rotate the rotary button on the digital multimeter 6 or press the button on the digital multimeter 6 to adjust it to the item to be measured. When clamping, first clamp the detection plug 52 with a lower height and insert it into the digital multimeter 6, then clamp the detection plug 52 with a higher height and insert it into the digital multimeter 6. Finally, the readings of the digital multimeter 6 are acquired by the vision device 411. When taking the readings, the light source is turned on to illuminate the reading area of ​​the digital multimeter 6 to facilitate visual acquisition.

[0065] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A digital multimeter intelligent calibration system apparatus, characterized in that, The utility model relates to a kind of digital multimeter test system, including: Operating platform (1), including table top (11) and cabinet (12); Metrological standard equipment (2) is arranged and installed on the operating platform (1), for providing measurement signal; Automatic positioning device (3) is arranged and installed on the table top (11), for the positioning of digital multimeter (6) to be measured; Collaborative robot (4), including control cabinet (42) and mechanical arm (41), the mechanical arm (41) is arranged and installed on the table top (11), for adjusting the button and plug-in detection line (51) of digital multimeter (6) to be measured;The end of the mechanical arm (41) is provided with visual equipment (411), for collecting digital multimeter (6) reading to be measured;The control cabinet (42) is arranged and installed in the cabinet (12), for sending operating signal to the mechanical arm (41); Test line conversion connecting device (5), including detection line (51) and detection socket (53);The detection socket (53) is arranged and installed on the table top (11), and the detection socket (53) is connected with the metrological standard equipment (2), and the detection line (51) is used to connect the detection socket (53) with digital multimeter (6) to be measured; Computer, arranged and installed on the operating platform (1);It is connected with metrological standard equipment (2), automatic positioning device (3) and control cabinet (42) respectively.

2. The digital multimeter intelligent calibration system apparatus of claim 1, wherein: The automatic positioning device (3) includes vertical positioning assembly (31), horizontal positioning assembly (32) and cover plate (33);The vertical positioning assembly (31) is arranged along the length direction of digital multimeter (6) to be measured, and is configured as openable and closable structure, for limiting the movement of digital multimeter (6) to be measured in its length direction along length direction;The horizontal positioning assembly (32) is arranged along the width direction of digital multimeter (6) to be measured, and is configured as openable and closable structure, for clamping digital multimeter (6) to be measured along width direction;The vertical positioning assembly (31) includes: positioning plate (311) and limiting plate (312), the positioning plate (311) is fixedly installed on the table top (11);The limiting plate (312) can move along the length direction of digital multimeter (6) to be measured, and when using, limiting plate (312) and digital multimeter (6) top leave gap for digital multimeter (6) to be measured to turn right;The vertical positioning assembly (31) further includes limiting plate driving element (313) connected with limiting plate (312), for driving the limiting plate (312) to move along the length direction of digital multimeter (6) to be measured;The cover plate (33) is covered on the horizontal positioning assembly (32) and the vertical positioning assembly (31), and the board face is provided with a waist-shaped hole.

3. The digital multimeter intelligent calibration system apparatus of claim 2, wherein: The transverse positioning assembly (32) comprises a first positioning unit and a second positioning unit; the first positioning unit corresponds to the lower part of the digital multimeter (6) to be tested and is configured to open and close in the width direction of the digital multimeter (6) to be tested; the second positioning unit corresponds to the upper part of the digital multimeter (6) to be tested and is configured to open and close in the width direction of the digital multimeter (6) to be tested; the first positioning unit and the second positioning unit act in sequence to guide and fix the digital multimeter (6) to be tested.

4. The digital multimeter intelligent calibration system apparatus of claim 3, wherein: The first positioning unit and the second positioning unit are structurally identical and each comprises a positioning column (321) and a positioning driving member (322); the positioning column (321) is provided with two positioning columns (321) and is located on both sides of the digital multimeter (6) to be tested; the positioning driving member (322) is connected with the two positioning columns (321) and is used to drive the two positioning columns (321) to open and close.

5. The digital multimeter intelligent calibration system apparatus of claim 4, wherein: The output end of the positioning driving member (322) is connected with a reversible toothed rod (323), and the two positioning columns (321) are arranged at the two ends of the reversible toothed rod (323); the positioning column (321) comprises a mounting shaft (3211) and a positioning sleeve (3212); the mounting shaft (3211) is connected with the reversible toothed rod (323) through a base; the positioning sleeve (3212) is assembled on the mounting shaft (3211) through a bearing so that the positioning sleeve (3212) rotates around its axis.

6. The digital multimeter intelligent calibration system apparatus of claim 1, wherein: The end of the mechanical arm (41) is provided with a V-shaped clamping jaw (412); the detection line (51) is provided with a detection plug (52) at both ends, the detection plug (52) is provided as a banana head, and the upper end of the detection plug (52) is provided with a V-shaped groove (521) used in cooperation with the V-shaped clamping jaw (412); the detection line (51) comprises a first detection line (51) and a second detection line (51); the detection socket (53) is provided with a plurality of detection jacks (531) matched with the detection plug (52); during detection, the detection plug (52) at one end of the detection line (51) is inserted into the detection socket (53), and the detection plug (52) at the other end is inserted into the detection hole of the digital multimeter (6) to be tested, which is used to transmit the measurement signal from the detection socket (53) to the digital multimeter (6) to be tested.

7. The digital multimeter intelligent calibration system apparatus of claim 6, wherein: The detection plugs (52) of the first detection line (51) and the second detection line (51) are provided at different heights to adapt to the digital multimeter (6) to be tested with narrow detection hole spacing and prevent the clamping from failing when the plug is pulled out; the V-shaped grooves (521) of the detection plugs (52) of the first detection line (51) and the second detection line (51) are provided at different heights, and the position of the V-shaped groove (521) on the detection plug (52) with a higher height is higher than the top of the detection plug (52) with a lower height, which facilitates the grabbing of the V-shaped clamping jaw (412).

8. The digital multimeter intelligent calibration system apparatus of claim 7, wherein: The V-shaped clamping jaw (412) is composed of two clamping plates (4121) arranged perpendicularly to the table top (11) of the operation table (1), and the opposite surfaces of the two clamping plates (4121) are provided with V-shaped protrusions (4122) matched with the V-shaped grooves (521) at the upper end of the detection plug (52), and the V-shaped protrusions (4122) are clamped with the V-shaped grooves (521) during grabbing to realize stable grabbing.

9. The digital multimeter intelligent calibration system apparatus of claim 6, wherein: The temporary socket (54) is installed on the automatic positioning device (3), and a plurality of temporary sockets (541) are arranged on the temporary socket (54) for storing the detection plugs (52) inserted into the detection holes of the digital multimeter (6) at one end of the first detection line (51) and the second detection line (51) in a non-working state; a plurality of guide blocks (55) are arranged on the detection socket (53) and the temporary socket (54), and guide angles (551) are arranged at the upper end of the guide blocks (55) to improve the accuracy when the detection plug (52) is inserted into the detection socket (531).

10. The digital multimeter intelligent calibration system apparatus of claim 1, wherein: The cabinet body (12) is provided with universal wheels (13) with height-adjustable supports at the four corners of the bottom; the cabinet body (12) is provided with ventilation openings (14) and wire passing holes (15) on the side; the mechanical arm (41) is further provided with a light source for illuminating the collection area of the visual equipment (411); the end of the mechanical arm (41) is further provided with a pressing rod (413) for pressing the keys of the digital multimeter (6) to be tested.

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