CN210135858U - Comprehensive calibration device for wide-range length measurement measuring tool based on laser interference - Google Patents

Abstract

The utility model discloses a comprehensive calibration device for long-range length measuring instruments based on laser interference, which belongs to the technical field of metrological verification of length measuring instruments. Rod inspection mechanism, caliper inspection mechanism and laser interference assembly; the calibration rod inspection mechanism includes a straight track set on the working platform, and an interference mirror bracket, a left measuring seat, and an adjustable V-shaped track are slidably connected on the straight track. The bracket, the four-dimensional worktable and the right measuring seat are floatingly connected with a left micrometer rod in the left measurement seat, and a mirror support is arranged at the non-measurement end of the left micrometer rod; the utility model is particularly suitable for large-range universal calipers, inner diameter Verification and calibration of micrometers and calibration rods; among them, the adjustment of the interference optical path is only related to the straightness of the moving part of the workpiece to be tested, and the linearity of the straight track on the base is not high, so the production requirements of the base itself are greatly reduced. Reduced costs.

Description

A Comprehensive Calibration Device for Large Range Length Measuring Tools Based on Laser Interference

technical field

The utility model belongs to the technical field of metrological verification of length measuring instruments, in particular to a comprehensive verification device for large-range length measuring instruments based on laser interference.

Background technique

The commonly used length measuring tools in the machinery industry mainly include general-purpose calipers and inner micrometers, which are widely used in manufacturing, installation, and scientific research institutes. Periodic verification and calibration, the verification measuring tools or calibrators for small-scale universal calipers and inner micrometers are relatively mature and can meet the verification requirements. However, with the rapid development of the equipment manufacturing industry, the requirements for large-range length measuring tools are increasing, especially for large-range general-purpose calipers and inner diameter micrometers. The number of internal micrometers and calibration rods submitted for inspection of the above ranges is increasing year by year, which puts forward higher requirements for their verification and calibration devices, and requires a more convenient and convenient comprehensive inspection and calibration that can realize automatic evaluation of measurement uncertainty device.

At present, the verification and calibration of the indication error of the large-scale length measuring instruments are mainly carried out by means of a combined gauge block. Because the main ruler is relatively long, heavy and has a large span, if the conventional measuring block is used as the standard for verification, the operation is relatively difficult, and there are many uncertain components, so it is difficult to achieve a certain verification accuracy. The Chinese Patent Publication No. CN108917515A discloses a continuous connection verification method for the indication error of a large-scale general-purpose caliper. Through the continuous zero-point operation of an auxiliary device and a standard gauge block, it can indicate the value of a general-purpose caliper with a range of more than 1000mm. Accurate verification of markings; standard gauge blocks can also be used in combination by continuing the zero-point operation, reducing the number of standard gauge blocks applied, thus partially solving the problems arising from the measurement of combined gauge blocks. Its measurement accuracy can not meet the verification and calibration requirements of all large-range length measuring instruments, and it cannot meet the correct judgment of the inflection point when measuring the large-range inner diameter micrometer and calibration rod, and the versatility is not high.

SUMMARY OF THE INVENTION

The purpose of this utility model is to solve the problems existing in the above-mentioned prior art and propose a large-scale length measuring instrument comprehensive calibration device based on laser interference; the technical scheme adopted in order to achieve the above-mentioned purpose is:

A comprehensive calibration device for large-range length measuring instruments based on laser interference, comprising a base, the top of the base is a working platform, and a calibration rod calibration mechanism and a caliper calibration mechanism are arranged on the working platform; The calibration mechanism includes a straight track set on the working platform, on which is slidably connected an interference mirror bracket, a left measurement seat, an adjustable V-shaped bracket, a four-dimensional workbench and a right measurement seat, and the interference mirror bracket is located on the left measurement seat. The adjustable V-shaped bracket and the four-dimensional worktable are located between the left measurement seat and the right measurement seat, and a left micrometer rod is floatingly connected in the left measurement seat, and a right micrometer is arranged in the right measurement seat. rod, with a mirror support at the non-measurement end of the left micrometer rod;

The caliper inspection mechanism includes a mirror bracket, a left caliper support seat and a right caliper support seat arranged on the working platform, the mirror bracket is located on the left side of the left caliper support seat, the left caliper support seat and the right caliper support seat They are respectively used to clamp and fix the two ends of the universal caliper with large range;

Also includes a laser interference component, the laser interference component includes a laser interferometer bracket, a laser interferometer, an interferometer and a plurality of mirrors, the interference mirror and the mirror are equipped with a mechanical fixing seat or a magnetic fixing seat; wherein the interference mirror It is installed on the interference mirror bracket, and a mirror is fixed on the mirror support, the mirror bracket and the movable claw of the large-range universal caliper.

Preferably, the adjustable V-shaped bracket includes a sliding seat slidably connected to a straight track, a lifting arm is provided on the sliding seat, a V-shaped branch arm is integrally formed on the top of the lifting arm, and a V-shaped branch arm is provided with Roller or buffer elastic sleeve.

Preferably, the four-dimensional worktable includes a sliding seat slidably connected to a straight track, and a four-axis supporting work platform is provided on the sliding seat.

Preferably, the straight track is a rack-shaped track, a gear or a gear set meshing with the rack is arranged in the left measuring seat and the right measuring seat, and the left measuring seat and the right measuring seat are provided with a gear for driving A manual wheel or stepper motor that is turned by a gear or set of gears.

Preferably, the caliper checking mechanism includes an auxiliary straight track arranged in parallel with the straight track, and the left caliper support seat and the right caliper support seat are slidably connected to the auxiliary straight track.

Preferably, the left caliper support base and the right caliper support base are fixed on the auxiliary straight track by bolts or magnetic bases.

Preferably, the left caliper support seat and the right caliper support seat have the same structure, and the two are collectively referred to as a caliper support seat. A vertically arranged adjustment column is connected, a clamping table is arranged at the top of the adjustment column, an L-shaped clamping arm is fixed on the side wall of the clamping table, and the transverse arm of the L-shaped clamping arm extends to the lifting table. Clamping bolts are provided above and above.

Preferably, a top tightening piece is hinged at the end of the clamping bolt.

Preferably, between the clamping table and the top end of the adjusting column, there are sliding rails arranged in the front-rear direction to realize the fine adjustment of the clamping table in the front-rear direction.

Preferably, the mechanical fixing seat of the interference mirror is provided with a through hole for passing through the support rod of the interference mirror bracket, and the mechanical fixing seat is provided with a fastening bolt, and the fastening bolt extends into the through hole.

The beneficial effects of the utility model are as follows: (1) the utility model realizes the comprehensive verification and calibration of the large-scale inner diameter micrometer, the calibration rod and the large-scale general-purpose caliper through the setting of the calibration rod calibration mechanism and the caliper calibration mechanism, The work efficiency is greatly improved; and the fast combined fixing method of the laser interferometer, the interference mirror and the mirror realizes the fast and accurate adjustment of the Michelson interference optical path, and the fixing of the interference mirror and the mirror does not damage the caliper itself;

(2) The mirror is fixed on the movable claw on the caliper through the magnetic base, which has no influence on the sliding and movement of the movable claw during the movement process, ensuring the accuracy of the movable claw itself;

(3) The clamping bolts at both ends hold the main ruler of the caliper relatively firmly, and it is not easy to loosen during the movement of the movable claw, which ensures the measurement accuracy;

(4) The clamping table on the caliper support seat can move in the front and rear directions, so that the optical path can be moved as a whole along the front and rear, which is very convenient to avoid the interference of the left measuring seat and the mirror bracket on the optical path;

(5) When calibrating or calibrating the inner micrometer and calibration rod waiting for the workpiece to be measured, compared with the traditional measurement method, the measurement of the fractional part of the workpiece to be measured is more accurate and fast, and the measurement accuracy is greatly improved;

(6) The utility model can be applied to the verification and calibration of length measuring instruments such as general-purpose calipers, inner micrometers, calibration rods, etc., and is especially suitable for the verification and calibration of large-range length measuring instruments;

(7) The adjustment of the interference optical path of the present utility model is only related to the straightness of the moving part of the workpiece to be measured, and the linearity of the straight track on the base is not high, so the manufacturing requirements of the base itself are greatly reduced, and the cost is reduced.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the structural schematic diagram of the adjustable V-shaped bracket of the card;

Fig. 4 is the structural representation of the four-dimensional workbench;

Fig. 5 is the top view of Fig. 4;

Fig. 6 is the structural schematic diagram of the left measuring seat;

Fig. 7 is the left side view of Fig. 6;

Fig. 8 is the structural schematic diagram of the left caliper support seat;

FIG. 9 is a left side view of FIG. 7 .

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, the utility model includes a base 7, the top of which is a working platform 6, and a calibration rod checking mechanism and a caliper checking mechanism are arranged on the working platform 6; The calibration mechanism includes a straight track arranged on the working platform 6, on which an interference mirror bracket 31, a left measurement seat 32, an adjustable V-shaped bracket 33, a four-dimensional workbench 34 and a right measurement seat 35 are slidably connected. The mirror bracket 31 is located on the left side of the left measurement seat 32, and the adjustable V-shaped bracket 33 and the four-dimensional worktable 34 are located between the left measurement seat 32 and the right measurement seat 35, as shown in Figure 1, Figure 6 and Figure 7 , a left micrometer rod 323 is floatingly connected in the left measurement seat 32, a right micrometer rod is arranged in the right measurement seat 35, and two adjustment rods are provided on the right measurement rod for micro-adjustment of the measuring cap when the zero position is adjusted. screw 8. A mirror support 322 is provided at the non-measurement end of the left micrometer rod 323 .

The floating structure of the left micrometer rod 323 here can adopt the following specific structure: the left micrometer rod 323 is located in the through hole 329 of the left measurement base 32, and is provided with a position near the left port and the right port in the through hole 329. The support roller set includes three eccentric rolling bearings 328 evenly distributed around the left micrometer rod 323 in the circumferential direction, and the left and right six eccentric rolling bearings 328 play a floating support role for the left micrometer rod 323; There is a steering wheel 325 inside the seat 32, a traction rope 324 is wound around the steering wheel 325, the left end of the traction rope 324 is fixed on the left micrometer rod 323, and the right end of the traction rope 324 is connected with a weight, so as to reduce the gravity of the weight 326 Converted into measuring force to ensure reliable contact between the left measuring cap 329 and the calibrated measuring tool.

Further, a guide plane 327 is machined on the left micrometer rod 323 in the left-right direction, and an eccentric rolling bearing 328 supporting the roller set is located at the guide plane 327 to prevent the rotation of the left micrometer rod 323 .

The caliper inspection mechanism includes a mirror bracket 21, a left caliper support seat 22 and a right caliper support seat 23 arranged on the working platform 6, the mirror bracket 21 is located on the left side of the left caliper support seat 22, and the left caliper support seat 22. The seat 22 and the right caliper support seat 23 are respectively used to clamp and fix both ends of the large-range universal caliper 4;

Also includes a laser interference component, the laser interference component includes a laser interferometer bracket 11, a laser interferometer 12, an interferometer 14 and a plurality of mirrors 13, 15, 16, the interferometer 14 and the mirrors 13, 15, 16 Equipped with a mechanical fixing seat or a magnetic fixing seat; wherein the interference mirror 14 is installed on the interference mirror bracket 31, and a mirror 13 is fixed on the mirror bracket 322, the mirror bracket 21 and the movable claw 5 of the large-range universal caliper. 15,16; The mechanical fixing seat of the interference mirror 14 is provided with a through hole for passing through the support rod of the interference mirror bracket 31, and the mechanical fixing seat is provided with a fastening bolt, and the fastening bolt extends into the through hole.

As shown in FIG. 3 , in order to improve the measurement accuracy of the large-scale inner diameter micrometer and the calibration rod, an adjustable V-shaped bracket 33 is added for its supporting part, and the adjustable V-shaped bracket 33 includes a sliding connection on a straight track. The seat 331 is provided with a lifting arm on the sliding seat 331, a V-shaped branch arm 332 is integrally formed on the top of the lifting arm, and a roller or a buffer elastic sleeve 333 is provided on the V-shaped branch arm 332; The structure can adopt the lifting structure in the prior art.

As shown in FIG. 4 and FIG. 5 , the four-dimensional worktable 34 includes a sliding seat 341 slidably connected to a straight track, and a four-axis support work platform 342 is provided on the sliding seat 341; the four-dimensional worktable 34 is an existing length measurement The adjustment platform of the machine can realize the functions of floating up and down, moving in the front and rear directions, moving in the left and right directions, inclining fine-tuning in the front and rear directions, and fine-tuning the inclination in the left and right directions.

The straight track is a rack-shaped track, the left measuring seat 32 and the right measuring seat 35 are provided with gears or gear sets that mesh with the rack, and the left measuring seat 32 and the right measuring seat 35 are provided with A manual wheel 321 or a stepper motor that drives the gear or gear set to rotate.

Among them, various fixed connection methods can be adopted between the left caliper support base 22 and the right caliper support base 23 and the working platform 6 , for example (1) the caliper calibration mechanism includes an auxiliary straight track arranged in parallel with the straight track, the The left caliper support base 22 and the right caliper support base 23 are slidably connected to the auxiliary straight track; (2) the left caliper support base 22 and the right caliper support base 23 can also be fixed on the working platform 6 by bolts or magnetic bases. The distance between the left caliper support base 22 and the right caliper support base 23 can be easily changed according to the actual situation.

As shown in FIG. 8 and FIG. 9 , for the convenience of description, the left caliper support base 22 and the right caliper support base 23 have the same structure, and they are collectively referred to as caliper support bases. An adjusting nut 221 is rotatably connected to the seat 222, a vertically arranged adjusting column 223 is threadedly connected in the adjusting nut 221, a clamping table 225 is arranged at the top of the adjusting column 223, and a side wall of the clamping table 225 is fixed with a L-shaped clamping arm 228, the transverse arm of L-shaped clamping arm 228 extends to 225 squares on the lifting table and is provided with clamping bolts 227; in order to increase the contact area between clamping bolts 227 and the main ruler of the universal caliper to increase the For the stability of the caliper, a top tightening piece 226 is hinged at the end of the clamping bolt 227 .

In order to adapt to the fixation of the interference mirror at different positions, a dovetail sliding pair 224 is arranged between the clamping table 225 and the top end 223 of the adjusting column in the front-rear direction to realize fine adjustment of the clamping table 225 in the front-rear direction.

When the utility model is working:

(1) When verifying or calibrating a large-range universal caliper, as shown in Figures 1 and 2, adjust the distance between the left caliper support base 22 and the right caliper support base 23 according to the range of the large-range caliper, and tighten the corresponding fixed The knob is fixed, and then the two ends of the large-range universal caliper 4 are placed horizontally on the clamping table 225, and the adjustment nut 221 is rotated to adjust the height of both ends of the large-range universal caliper 4 so that the two ends are roughly on the same level. Clamp the bolts 227 to fix the large-range universal caliper firmly; then, the reflector 13 is fixedly installed on the reflector bracket 21 through the mechanical fixing seat, and the reflector 16 is magnetically attracted to the movable claw 5 of the large-range universal caliper through the magnetic fixing seat. Above, the mechanical fixing seat and the magnetic fixing seat are connected with the reflector 13 and the reflector 16 in a detachable and fixed manner through screws; set up the laser interferometer 12, let the emitted laser pass through the interferometer 14 first, and be divided into the reference optical path and the measurement The optical path, the measurement optical path passes through the mirror 13 and the mirror 16 in turn, and then is reflected by the mirror 16 to form interference with the reference optical path, and is received again by the laser interferometer 12 to form a Michelson interference optical path, and the movable claw 5 is moved back and forth. The interferometer 12 is fine-tuned so that the Michelson interference optical path can be formed in the entire moving range of the movable claw 5, that is, the laser is parallel to the moving direction of the movable claw 5, so that the movement of the movable claw 5 can be accurately and quickly measured by the laser interferometer 12. Finally, the measured value of the laser interferometer 12 is compared with the scale value on the large-range universal caliper 4 to calculate the indication error of the large-range universal caliper, and the measurement uncertainty evaluation can also be given by using its own data processing system.

(2) When the inner micrometer or calibration rod is waiting for the workpiece to be verified or calibrated, the mirror 15 is magnetically attracted to the mirror support 322 through the magnetic fixing seat, and the interference mirror 14 on the interference mirror support 31 is horizontally rotated 90 degrees , let the measuring optical path of the interfering mirror 14 correspond to the position of the reflecting mirror 15, set up the laser interferometer 12, let the emitted laser pass through the interfering mirror 14 first, and be divided into the reference optical path and the measuring optical path, the measuring optical path passes through the reflecting mirror 15, and then passes through the After the reflection mirror 15 interferes with the reference optical path, it is received again by the laser interferometer 12 to form a Michelson interference optical path; after the interference optical path is adjusted, move the left measuring seat 32, so that the left measuring cap 330 of the left micrometer rod 323 and the left measuring cap 330 of the left micrometer rod 323 The right measuring cap is in contact, the micro-movement of the right measuring cap is changed by adjusting the right micrometer rod screw 8, and the inflection point is searched, so that the left measuring cap 330 and the right measuring cap are in the same straight line, and then the reading of the laser interferometer 12 is reset, this position as zero point.

Finally, place the workpiece to be measured on the adjustable V-shaped bracket 33 and the four-dimensional worktable 34, adjust the height of the adjustable V-shaped bracket 33, and make the connection between the workpiece to be measured and the two measuring caps coincide, and then move the left measuring seat 32 Make the left micrometer rod 323 and the measuring caps at the ends of the right micrometer rod correspond to both ends of the workpiece to be measured, and then adjust the four-axis adjustment platform to change the multi-dimensional micro-motion of the workpiece to be measured, and drive the left micrometer rod 323 to perform left and right The micro-movement of the direction, the micro-movement of the left micrometer rod 323 will drive the mirror support 322 to micro-move so that the amount of change is measured by the laser interferometer 12, and the measured value when the inflection point occurs is the reading of the workpiece to be measured, which is the same as the standard. The values are compared to calculate the indication error of the workpiece to be measured, and the measurement uncertainty evaluation can also be given by using its own data processing system.

This embodiment does not limit the shape, material, structure, etc. of the present invention in any form, and any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention belong to the technology of the present invention. The scope of protection of the program.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements to some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the embodiments of the present invention. and range.

Claims (10)

1. a comprehensive calibration device based on a large range length measurement measuring tool based on laser interference, comprises a base, and the top of the base is a working platform, and it is characterized in that, on the working platform, a calibration rod calibration mechanism and a caliper calibration mechanism are provided ; The calibration rod inspection mechanism includes a straight track arranged on the working platform, and an interference mirror bracket, a left measuring seat, an adjustable V-shaped bracket, a four-dimensional workbench and a right measuring seat are slidably connected on the straight track. The mirror bracket is located on the left side of the left measurement seat, the adjustable V-shaped bracket and the four-dimensional worktable are located between the left measurement seat and the right measurement seat, and a left micrometer rod is floatingly connected in the left measurement seat. There is a right micrometer rod inside, and a mirror support is provided at the non-measurement end of the left micrometer rod; The caliper inspection mechanism includes a mirror bracket, a left caliper support seat and a right caliper support seat arranged on the working platform, the mirror bracket is located on the left side of the left caliper support seat, the left caliper support seat and the right caliper support seat They are respectively used to clamp and fix the two ends of the universal caliper with large range; Also includes a laser interference component, the laser interference component includes a laser interferometer bracket, a laser interferometer, an interferometer and a plurality of mirrors, the interference mirror and the mirror are equipped with a mechanical fixing seat or a magnetic fixing seat; wherein the interference mirror It is installed on the interference mirror bracket, and a mirror is fixed on the mirror support, the mirror bracket and the movable claw of the large-range universal caliper. 2 . The comprehensive calibration device for large-range length measuring tools based on laser interference according to claim 1 , wherein the adjustable V-shaped bracket comprises a sliding seat slidably connected on a straight track, and a sliding seat is provided on the sliding seat. 3 . There is a lift arm, a V-shaped branch arm is integrally formed on the top of the lift arm, and a roller or a buffer elastic sleeve is arranged on the V-shaped branch arm. 3. The comprehensive calibration device for large-range length measuring tools based on laser interference according to claim 1, wherein the four-dimensional workbench comprises a sliding seat that is slidably connected on a straight track, and four are provided on the sliding seat. The shaft supports the work platform. 4. The comprehensive calibration device for large-range length measuring instruments based on laser interference according to claim 1, wherein the straight track is a rack-shaped track, and the left measuring seat and the right measuring seat are provided with and A gear or a gear group meshed with a rack, and a manual runner or a stepper motor for driving the gear or the gear group to rotate is arranged on the left measuring seat and the right measuring seat. 5. The comprehensive calibration device for large-range length measuring instruments based on laser interference according to any one of claims 1 to 4, wherein the caliper calibration mechanism comprises an auxiliary straight track arranged in parallel with the straight track, so The left caliper support seat and the right caliper support seat are slidably connected on the auxiliary straight track. 6 . The comprehensive calibration device for large-range length measuring instruments based on laser interference according to claim 5 , wherein the left caliper support seat and the right caliper support seat are fixed on the auxiliary straight track by bolts or magnetic seats. 7 . 7. The comprehensive calibration device for a large-range length measuring tool based on laser interference according to claim 6, wherein the left caliper support seat and the right caliper support seat have the same structure, and the two are collectively referred to as a caliper support seat, The caliper support base includes a fixed base, an adjusting nut is rotatably connected to the fixed base, a vertically arranged adjusting column is threadedly connected in the adjusting nut, a clamping table is provided at the top of the adjusting column, and a side of the clamping table is provided. An L-shaped clamping arm is fixed on the wall, and the transverse arm of the L-shaped clamping arm extends above the lifting table and is provided with clamping bolts. 8 . The comprehensive calibration device for large-range length measuring tools based on laser interference according to claim 7 , wherein a top tightening piece is hinged on the end of the clamping bolt. 9 . 9 . The comprehensive calibration device for large-range length measuring tools based on laser interference according to claim 7 , wherein a slide rail arranged in the front-rear direction is provided between the clamping table and the top of the adjusting column to realize clamping. 10 . Fine adjustment of the table in the front and rear direction. 10 . The comprehensive calibration device for large-range length measuring instruments based on laser interference according to claim 7 , wherein the mechanical fixing seat of the interferometer is provided with a perforation for passing through the support rod of the interferometer bracket. 10 . Fastening bolts are arranged on the mechanical fixing seat, and the fastening bolts extend into the through holes.

Images