Calibrating device for gap ruler
By designing a clearance ruler calibration device with simple structure and easy operation, the problem of expensive and complex operation of the clearance ruler calibration equipment in the prior art is solved, and the rapid and effective calibration of different types of clearance rulers is achieved.
Patent Information
- Application Number
- CN202422138630.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-30
AI Technical Summary
The existing gap ruler calibration methods rely on high-precision and expensive equipment, such as length gauge and universal tool microscope, are complex in operation and difficult to achieve rapid calibration, resulting in waste of manpower and material resources.
A gap ruler calibration device is designed, including a measuring table with grooves, a spiral digital micrometer microphone head, a square crossbeam, a magnifying glass and a connector, which can calibrate the flat feeler, tapered feeler and wedge feeler. It has a simple structure, easy to carry and simple operation.
It realizes rapid calibration of different types of gap rulers, reduces equipment costs and operational complexity, improves calibration efficiency, and reduces waste of manpower and material resources.
Smart Images
Figure CN223021164U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of metrological calibration, in particular to a calibration device for a clearance gauge. Background Art
[0002] A clearance gauge is a metrological device used to measure the clearance between objects or the size of apertures. It can be roughly divided into flat feeler gauges, wedge feeler gauges and tapered feeler gauges according to the structural form, application range and accuracy. In order to ensure the accuracy, it should be regularly sent for inspection or self-calibrated every year.
[0003] At present, clearance gauges are mainly calibrated and measured by metrological standards such as length measuring instruments, universal tool microscopes and dial indicators. These metrological standards are high-precision devices, which can only be installed in a constant temperature laboratory and cannot be carried out of the laboratory. Moreover, length measuring instruments and universal tool microscopes are relatively expensive, and it is easy to damage the measuring heads when used to calibrate clearance gauges. And the equipment is relatively complex to operate, with relatively high requirements for operators, and it is difficult to achieve rapid calibration. Therefore, using them to calibrate clearance gauges wastes manpower and material resources. Summary of the Utility Model
[0004] In view of this, the purpose of the utility model is to provide a calibration device for a clearance gauge to solve technical problems such as replacing length measuring instruments and universal tool microscopes to calibrate clearance gauges, reducing the cost of calibration equipment and improving the calibration efficiency.
[0005] The calibration device for a clearance gauge of the utility model includes a measuring table with a groove, two spiral digital micrometer heads symmetrically arranged on both sides of the measuring table and with the measuring rods facing into the groove, a square cross beam arranged on the measuring table and above the groove, a magnifying glass for observing the contact part between the measuring rod and the clearance gauge, and a connector for connecting the magnifying glass and the cross beam. The connector includes a sliding buckle slidably matched with the cross beam, a first threaded locking handle arranged on the sliding buckle for fixing the sliding buckle, a round sleeve connected to the sliding buckle, and a second threaded locking handle arranged on the round sleeve. The magnifying glass is placed in the round sleeve and fixed by the second threaded locking handle.
[0006] Further, the calibration device for a clearance gauge further includes a shim block arranged in the groove.
[0007] Advantages of the Utility Model
[0008] 1. The calibration device for a clearance gauge of the utility model can calibrate flat feeler gauges, tapered feeler gauges and wedge feeler gauges, and has good versatility.
[0009] 2. The calibration device for a clearance gauge of the utility model has a simple structure, is easy to carry, and has simple operation and high detection efficiency. It can replace tool microscopes and length measuring machines to calibrate clearance gauges, and can reduce the purchase cost and traceability cost of users. Description of the Drawings
[0010] Figure 1 It is a three-dimensional structural schematic diagram of a gap gauge calibration device.
[0011] Figure 2 It is a three-dimensional structural schematic diagram of a flat feeler gauge placed in the gap gauge calibration device.
[0012] Figure 3 It is a three-dimensional structural schematic diagram of a conical feeler gauge placed in the gap gauge calibration device.
[0013] Figure 4 It is a three-dimensional structural schematic diagram of a wedge feeler gauge placed in the gap gauge calibration device. Specific embodiments
[0014] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.
[0015] The gap gauge calibration device in this embodiment includes a measuring table 1 with a groove, two spiral digital micrometer differential heads 2 symmetrically arranged on both sides of the measuring table and the measuring rods facing and extending into the groove, a square cross beam 3 arranged on the measuring table and above the groove, a magnifying glass 4 for observing the contact part between the measuring rod and the gap gauge, and a connector for connecting the magnifying glass and the cross beam. The connector includes a sliding buckle 5 slidably matched with the cross beam, a first threaded locking handle 6 arranged on the sliding buckle for fixing the sliding buckle, a round sleeve 7 connected to the sliding buckle, and a second threaded locking handle 8 arranged on the round sleeve. The magnifying glass is placed in the round sleeve and fixed by the second threaded locking handle.
[0016] As an improvement to the above embodiment, the gap gauge calibration device further includes a padding block 9 arranged in the groove.
[0017] The method for calibrating a common flat feeler gauge 10 using the gap gauge calibration device in the above embodiment is as follows:
[0018] Before measurement, the micrometer to be measured and the calibration device should be placed in a constant temperature environment of (20±8)°C for at least 1 hour. Rotate the differential heads of the two spiral digital micrometers so that the working end faces of their measuring rods are in tactile contact. At this time, perform a zeroing operation on the readings of the differential heads of the two spiral digital micrometers. Then, keep the measuring rod of the differential head of the left spiral digital micrometer stationary, rotate the differential head of the right spiral digital micrometer to make its measuring rod retreat to a sufficient position, and then place the micrometer to be inspected between the two measuring rods, making the cross-section of the measuring rod of the differential head of the left spiral digital micrometer in tactile contact with the front surface of the micrometer. Then, rotate the differential head of the right spiral digital micrometer to make the end face of its measuring rod in tactile contact with the back surface of the micrometer. At this time, observe and record the readings A1 and A2 of the differential heads of the left and right spiral digital micrometers. Under normal circumstances, A1 is always zero, and the reading of A2, which is the measured value, is the thickness of the micrometer at this point. Otherwise, the thickness of the micrometer is the value of A1+A2. If the reading of A1 becomes negative, it should be zeroed again according to the above method and then measured. The indication error at this point is equal to the nominal value of the micrometer - the measured value. During measurement, at least 3 calibration points should be distributed on the center line of the working area of the micrometer. When calibrating a flat micrometer, the elevation block 9 does not need to be set in the measuring table 1.
[0019] The method for calibrating the conical micrometer 11 using the clearance gauge calibration device in the above embodiment is as follows:
[0020] Before measurement, the conical micrometer to be measured and the calibration device should be placed in a constant temperature environment of (20±8)°C for at least 1 hour. Rotate the differential heads of the two spiral digital micrometers so that the end faces of the measuring rods of the two spiral digital micrometers are in tactile contact. At this time, perform a zeroing operation on the readings of the differential heads of the two spiral digital micrometers. Rotate the differential heads of the left and right spiral digital micrometers to make the end faces of their measuring rods move away to a sufficient position, and then place a sufficiently high elevation block on the measuring table. Place the front surface (the side with scale) of the conical micrometer to be inspected face up on the elevation block, so that the left and right end faces of the scale of the conical micrometer can be roughly distributed on the axial diameters of the two measuring rods. Adjust the position of the connector along the square crossbeam, move the magnifying glass above the conical micrometer, and adjust the focal length of the magnifying glass so as to clearly see the magnified contour of the scale of the conical micrometer to be measured. With the help of the magnifying glass, move the conical micrometer to be measured and the differential heads of the spiral digital micrometers so that the middle parts of the two ends of the same scale line of the conical micrometer to be measured are respectively in contact with the edges of the end faces of the measuring rods of the left and right spiral digital micrometers. At this time, observe and record the readings A1 and A2 of the differential heads of the left and right spiral digital micrometers. The value of A1+A2 is the measured value of this scale line, and the indication error at this point is equal to the nominal value of the conical micrometer - the measured value. During measurement, at least 5 calibration points should be measured approximately evenly distributed within the measurement range of the conical micrometer to be measured.
[0021] The method for calibrating the wedge-shaped micrometer 12 using the clearance gauge calibration device in the above embodiment is as follows:
[0022] Before measurement, the wedge feeler gauge to be measured and the calibration device shall be placed in a constant temperature environment of (20±8)°C for at least 1 h. Rotate the differential heads of the two screw digital micrometers so that the end faces of the measuring rods of the differential heads of the two screw digital micrometers are in tactile contact. At this time, perform a zeroing operation on the readings of the two screw digital micrometers. Then keep the measuring rod of the differential head of the left screw digital micrometer stationary, and rotate the differential head of the right screw digital micrometer to separate the end faces of the two measuring rods by a sufficient distance. Then place a sufficiently high spacer block on the measuring table, place the wedge feeler gauge to be inspected on the spacer block sideways, and then move the bottom surface of the wedge feeler gauge to be inspected (i.e., the back of the engraved line surface) to be in tactile contact with the end face of the measuring rod of the differential head of the left screw digital micrometer. Adjust the position of the connector along the square cross beam, move the magnifying glass above the tapered feeler gauge, and adjust the focal length of the magnifying glass to clearly see the engraved line profile of the wedge feeler gauge to be measured after magnification. With the help of the magnifying glass for observation, rotate the differential head of the right screw digital micrometer so that the end face of its measuring rod just touches the middle position of the engraved line of the wedge feeler gauge to be measured. At this time, observe and record the indicated values A1 and A2 shown on the differential heads of the left and right screw digital micrometers. Under normal circumstances, A1 is always zero, and the indicated value of A2 is the measured value at this engraved line position. Otherwise, the measured value at this engraved line position is the value of A1+A2. If the indicated value of A1 becomes negative, it should be re-zeroed according to the above method and then measured. The indicated error at this point is equal to the nominal value of the wedge feeler gauge - the measured value. During measurement, at least 5 calibration points should be measured approximately evenly distributed within the measurement range of the wedge feeler gauge to be measured.
[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.
Claims
1. A gap gauge calibration device, characterized in that: The invention comprises a measuring platform with a groove, two spiral digital micrometer differential heads symmetrically arranged on both sides of the measuring platform with measuring rods directly facing and extending into the groove, a square crossbeam arranged on the measuring platform and located above the groove, a magnifying glass for observing the contact part between the measuring rod and the gap scale, and a connector for connecting the magnifying glass and the crossbeam, wherein the connector comprises a slide buckle slidably matched with the crossbeam, a first threaded locking handle arranged on the slide buckle for fixing the slide buckle, a round sleeve connected to the slide buckle, and a second threaded locking handle arranged on the round sleeve, wherein the magnifying glass is placed in the round sleeve and fixed by the second threaded locking handle.
2. The gap gauge calibration device according to claim 1, characterized in that: Also included is a spacer block arranged in the groove.