Automatic calibration device for steel tape

Abstract

The utility model provides an automatic calibration device for a steel tape, which comprises a calibration table, and a tape band clamp, a pulley, a reading microscope, a displacement sensor and a processor which are arranged on the calibration table, and a standard tape placing area and a measured tape placing area are arranged on the calibration table in parallel. The outer side of the standard ruler placing area and the outer side of the measured ruler placing area are each provided with a sliding guide rail in parallel, the sliding guide rails are used for sliding of the tackle, the reading microscope, the displacement sensor and the processor are integrated on the tackle, a plurality of inserting grooves are formed in the verification table in the sliding direction of the tackle at intervals according to the preset length, and inserting plates are arranged for the inserting grooves. The automatic calibration device for the steel tape can improve the precision and efficiency of steel tape calibration, meets the calibration requirements of steel tapes with different lengths, and has the advantages of simplicity and convenience in operation, good stability and the like.

Description

Technical Field

[0001] This utility model belongs to the field of steel tape measure calibration technology, specifically relating to an automatic steel tape measure calibration device. Background Technology

[0002] Steel measuring tapes, widely used in construction, machinery manufacturing, and daily life, directly impact the accuracy of measurement results. The larger the measuring range, the greater the potential error. Taking bus production as an example, inaccurate steel measuring tapes can affect the measurement of the vehicle body structure and the cutting dimensions of sheet metal, leading to significant waste and impacting production efficiency and costs. In actual production applications, steel measuring tapes inevitably experience deformation before being stored after purchase. Therefore, it is necessary to perform batch calibration of production steel measuring tapes before warehousing. This involves testing the measured steel tapes with high-precision, calibrated standard steel measuring tapes, and then returning or scrapping any measuring tapes that deviate from the standard.

[0003] Currently, traditional steel tape measure calibration mainly relies on manual operation, comparing the steel tape measure with a standard length measuring instrument. This method has many drawbacks. Manual operation is slow, especially when calibrating a large number of steel tape measures, consuming significant time and manpower. Furthermore, calibration accuracy is limited; human judgment of scale differences is prone to error, particularly in accurately identifying minute errors, making it difficult to guarantee calibration precision. In addition, repetitive manual calibration work can easily lead to operator fatigue, further affecting calibration quality and efficiency. Therefore, it is necessary to design an automatic steel tape measure calibration device that can improve calibration efficiency and accuracy to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide an automatic calibration device for steel tape measures that can improve the accuracy and efficiency of steel tape measure verification.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] This utility model provides an automatic calibration device for steel tape measures, including a calibration table and a tape clamp, a trolley, a reading microscope, a displacement sensor, and a processor disposed on the calibration table. A standard tape placement area and a tape to be measured placement area are arranged in parallel on the calibration table, and a sliding guide rail for the trolley to slide is provided parallel to the outer side of the standard tape placement area and the outer side of the tape to be measured placement area, respectively. The reading microscope, the displacement sensor, and the processor are integrated on the trolley. Along the sliding direction of the trolley, a number of slots are provided on the calibration table at preset length intervals, and insert plates are configured in the slots.

[0007] In one embodiment, the standard ruler placement area and the measured ruler placement area are provided with positioning grooves indicating the starting position of the measuring tape.

[0008] In one embodiment, a digital display box for displaying test data of the displacement sensor is also included, and the processor is integrated within the digital display box.

[0009] In one embodiment, the trolley also integrates an integrated industrial camera.

[0010] In one embodiment, the trolley is equipped with an illumination lamp relative to the reading microscope.

[0011] In one embodiment, two 5kg weights are also included.

[0012] In one embodiment, the calibration stand is a modular design that can be spliced ​​together, including at least one standard calibration stand, and the effective working length of one of the standard calibration stands is 5m.

[0013] In one embodiment, the effective working length of the calibration table is in the range of 5 to 50 meters.

[0014] In one embodiment, the reading microscope has a magnification of 20x and an accuracy of 0.01mm.

[0015] In one embodiment, the displacement sensor is a grating displacement sensor or a capacitive grating displacement sensor.

[0016] Compared with existing technologies, the automatic calibration device for steel tape measures of this utility model includes a calibration table and a tape clamp, a pulley, a reading microscope, a displacement sensor, and a processor mounted on the calibration table. The calibration table has a standard tape placement area and a test tape placement area arranged parallel to each other. The reading microscope, displacement sensor, and processor are integrated on the pulley. Along the sliding direction of the pulley, the calibration table has several slots spaced at preset lengths, and insert plates are configured for each slot. Through the design of the preset length slots and insert plates on the calibration table, segmented calibration of long steel tape measures can be achieved. When the test steel tape measure is long, the sliding stop point of the pulley can be quickly located by inserting the insert plate into the corresponding slot. The ability to quickly complete the calibration of the current testing section of the steel tape measure improves the calibration efficiency for longer steel tape measures. The calibration process is more standardized and convenient, suitable for calibrating various types of steel tape measures. The rational design of each structure and the optimized overall structure ensure the stability of the device during long-term use, reducing calibration errors and work delays caused by device malfunctions. The calibration table adopts a modular length extension design to meet the calibration needs of steel tape measures of different lengths. Strict control of the table's straightness and static friction, along with the use of high-precision standard steel tape measures, reading microscopes, and grating displacement sensors, effectively improves the accuracy of steel tape measure calibration and meets the calibration requirements of various high-precision steel tape measures. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an embodiment of the automatic calibration device for steel measuring tapes according to the present invention;

[0018] Figure 2 for Figure 1 The diagram shows the structure of the automatic calibration device for steel measuring tape from a top-down view.

[0019] Explanation of the attached diagram labels: 1. Calibration table; 11. Standard ruler placement area; 12. Measured ruler placement area; 13. Positioning slot; 14. Support base; 2. Ruler clip; 3. Pulley; 4. Reading microscope; 5. Sliding guide rail; 6. Slot; 7. Insert plate; 8. Illumination lamp; 9. Weight. Detailed Implementation

[0020] See also Figure 1-2This embodiment provides an automatic calibration device for steel tape measures, including a calibration table 1 and a tape clamp 2, a trolley 3, two 5kg weights 9, a reading microscope 4, a displacement sensor, an integrated industrial camera, a processor, and a digital display box for displaying test data from the displacement sensor, all mounted on the calibration table 1. A standard tape measure placement area 11 and a measured tape measure placement area 12 are arranged parallel to each other on the calibration table 1. Positioning grooves 13 indicating the starting position of the tape measure are provided on both the standard tape measure placement area 11 and the measured tape measure placement area 12. A sliding guide rail 5 for the trolley 3 to slide is provided parallel to the outer side of both the standard tape measure placement area 11 and the outer side of the measured tape measure placement area 12. The reading microscope 4, displacement sensor, processor, integrated industrial camera, and digital display box are integrated on the trolley 3. The displacement sensor is a grating displacement sensor. An illumination lamp 8 is also provided on the trolley 3 relative to the reading microscope 4. Several slots 6 are provided at preset length intervals along the sliding direction of the trolley 3, and insert plates 7 are configured on the slots 6. The calibration table 1 is provided with several slots 6 at preset length intervals, and each slot 6 is equipped with a plate 7. The slots 6 and plates 7 are set at preset length intervals to facilitate rapid segmented calibration of long steel tape measures. By inserting the plate into the corresponding slot, the sliding stop point of the trolley can be quickly located, and the calibration of the current test segment of the steel tape measure can be completed quickly, which helps to improve the calibration efficiency of long steel tape measures.

[0021] In this embodiment, the calibration platform 1 adopts a modular design that can be spliced ​​together, including at least one standard calibration platform. The effective working length of a standard calibration platform is 5m, and it can be arbitrarily extended to 50m in 5-meter segments to meet the calibration requirements of steel tape measures of different lengths. The straightness of the parallel standard tape measure placement area 11 and the measured tape measure placement area 12 on the calibration platform 1 is ≤0.5mm / m, ensuring that the steel tape measure can be placed in a straight line during the calibration process and reducing measurement errors caused by guide rail bending. The static friction of the calibration platform 1 is ≤4N, reducing the resistance to the stretching of the steel tape measure and ensuring the accuracy of the applied tension, so that the steel tape measure can be calibrated under standard tension. The standard tape measure at the standard tape measure placement area 11 is a full-scale standard steel tape measure with an accuracy of (0.02 +0.02L)mm (better than JJG41-2022 "Standard Steel Tape Measure"), which serves as the reference instrument for measurement and is regularly sent for inspection, providing a high-precision reference standard for steel tape measure calibration. The reading microscope 4 has a magnification of 20x and a minimum scale value of 0.01mm to improve reading accuracy. The grating displacement sensor uses a minimum resolution of 0.01mm / 20mm to accurately measure the displacement changes of the steel tape measure, providing reliable data for length measurement. Specific technical parameters are as follows: A 10m standard ruler with an accuracy of (0.02+0.02L)mm is provided for comparison measurement with the steel tape measure under test to ensure accuracy; two 5kg weights are provided to apply tension to the standard ruler and the measured ruler during operation, keeping the steel tape measure in a standard tensile state and ensuring consistent measurement conditions; two tape clips are provided to fix the steel tape measure tape for convenient measurement operation; a 20x reading microscope with an accuracy of 0.01mm is configured to aim at the scale of the steel tape measure and assist in reading; an integrated industrial camera and a small trolley with illumination are also provided to assist the reading microscope in measurement, improving the accuracy and convenience of reading. It adopts one digital display box, with the processor integrated inside. It uses a grating sensor as the main measurement unit to realize data acquisition, processing and display. It is equipped with one power supply to provide a stable power supply to the digital display box and ensure the normal operation of the equipment.

[0022] The automatic calibration device for steel tape measures in this embodiment operates as follows: First, the main structural components are installed according to design requirements, ensuring the straightness of the calibration table meets the standard of ≤0.5mm / m. The full-scale standard steel tape measure, grating displacement sensor, and other measuring components are installed, ensuring their installation accuracy. The digital display box, power supply, and other electrical components are connected, ensuring normal electrical connections. Then, the steel tape measure to be measured and the 10m standard ruler are installed on their respective areas on the calibration table. The measuring microscope is used to aim at the steel tape measure and the 10m standard ruler, ensuring that the steel tape measure and the 10m standard ruler are aligned correctly. The 0-mark of the standard ruler is aligned and fixed with a ruler clip. A 5kg weight is installed on both the standard ruler and the ruler under test, and a specified tension is applied to bring the ruler to a standard tensile state. Auxiliary devices such as the reading microscope, integrated industrial camera, and lighting are turned on and adjusted to suitable working conditions. The digital display box and power supply are turned on to ensure normal equipment operation. Then, the trolley slides, and the reading microscope is used to aim at the scale of the steel tape measure. Combined with the data measured by the grating displacement sensor, the measurement results are read and recorded on the digital display box. At the same time, the integrated industrial camera takes corresponding photos for archiving. According to the requirements of the JJG4-2015 National Metrological Verification Regulation for Steel Tapes, measurements are taken at different scale points to complete the verification of the steel tape measure. Finally, the processor in the digital display box processes and stores the measurement data, judges the measurement results according to relevant standards, and issues a verification report.

[0023] This utility model discloses an automatic calibration device for steel tape measures, comprising a calibration table and a tape clamp, a pulley, a reading microscope, a displacement sensor, and a processor mounted on the calibration table. The calibration table has a standard tape measure placement area and a test tape measure placement area arranged parallel to each other. The reading microscope, displacement sensor, and processor are integrated on the pulley. Along the sliding direction of the pulley, the calibration table has several slots spaced at preset lengths, and insert plates are configured for each slot. Through the design of the preset length slots and insert plates on the calibration table, segmented calibration of long steel tape measures can be achieved. When the test tape measure is long, inserting the insert plate into the corresponding slot quickly positions the sliding stop point of the pulley, rapidly completing the calibration. The calibration of the current testing section of the steel tape measure improves the calibration efficiency for longer steel tape measures. The calibration process is more standardized and convenient, applicable to the calibration of various types of steel tape measures. The rational design of each structure and the optimized overall structure ensure the stability of the device during long-term use, reducing calibration errors and work delays caused by device malfunctions. The calibration table adopts a modular length extension design to meet the calibration needs of steel tape measures of different lengths. Strict control of the straightness and static friction of the calibration table, along with the use of high-precision standard steel tape measures, reading microscopes, and grating displacement sensors, effectively improves the accuracy of steel tape measure calibration and meets the calibration requirements of various high-precision steel tape measures.

[0024] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0025] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. An automatic calibration device for steel measuring tapes, characterized in that, The device includes a calibration table (1) and a tape clip (2), a trolley (3), a reading microscope (4), a displacement sensor, and a processor, all mounted on the calibration table (1). The calibration table (1) has a standard ruler placement area (11) and a ruler placement area (12) arranged in parallel. A sliding guide rail (5) for the trolley (3) to slide is provided parallel to the outer side of the standard ruler placement area (11) and the outer side of the ruler placement area (12). The reading microscope (4), the displacement sensor, and the processor are integrated on the trolley (3). Along the sliding direction of the trolley (3), the calibration table (1) has several slots (6) spaced at preset lengths, and insert plates (7) are provided on the slots (6).

2. The automatic calibration device for steel measuring tapes as described in claim 1, characterized in that, The standard ruler placement area (11) and the measured ruler placement area (12) are provided with positioning grooves (13) indicating the starting position of the measuring tape.

3. The automatic calibration device for steel measuring tapes as described in claim 1, characterized in that, It also includes a digital display box for displaying test data of the displacement sensor, and the processor is integrated in the digital display box.

4. The automatic calibration device for steel measuring tapes as described in claim 1, characterized in that, The trolley (3) also integrates an integrated industrial camera.

5. The automatic calibration device for steel measuring tapes as described in claim 1, characterized in that, The trolley (3) is equipped with an illumination lamp (8) relative to the reading microscope (4).

6. The automatic calibration device for steel measuring tapes as described in any one of claims 1-5, characterized in that, It also includes two 5kg weights (9).

7. The automatic calibration device for steel measuring tapes as described in any one of claims 1-5, characterized in that, The calibration table (1) is a modular design that can be spliced ​​together, including at least one standard calibration table, and the effective working length of one of the standard calibration tables is 5m.

8. The automatic calibration device for steel measuring tapes as described in claim 7, characterized in that, The effective working length of the calibration table (1) is 5 to 50 meters.

9. The automatic calibration device for steel measuring tapes as described in any one of claims 1-5, characterized in that, The reading microscope (4) has a magnification of 20x and an accuracy of 0.01mm.

10. The automatic calibration device for steel measuring tapes as described in any one of claims 1-5, characterized in that, The displacement sensor is a grating displacement sensor or a capacitive grating displacement sensor.

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