CN113945171A - Flatness measuring device and using method thereof - Google Patents

Abstract

A flatness measuring device comprises a laser measuring head, a one-dimensional electric translation table, a rotary structure, a measured plane and an upper computer system. The laser probe includes: the device comprises a triangular laser sensor, a mounting frame, a lithium battery, a single chip microcomputer system, a Bluetooth antenna, a translation motor driver, a first screw, a steel wire threaded sleeve, a second screw, a compression nut, a battery pressing plate and a first flange; the laser measuring head is connected with the one-dimensional electric translation table through a first flange, and the one-dimensional electric translation table is connected with the rotary structure through a second flange arranged at the bottom. The lithium battery provides power for the trigonometry laser sensor, the single chip microcomputer system, the translation motor driver and the translation motor of the one-dimensional electric translation platform. The revolution structure drives the one-dimensional electric translation table and the laser measuring head to rotate, so that laser can scan circumferential lines with different radiuses of a measured plane, a normal plane of a revolution axis is used as a reference plane, flatness is calculated according to scanning data on each circumferential line, then the flatness on a plurality of circumferential lines is fused, and comprehensive flatness after plane inclination is removed can be obtained. The invention has stable measuring reference, high detecting precision and efficiency, convenient operation, independent use and on-machine measurement with other devices.

Description

Flatness measuring device and using method thereof

Technical Field

The invention relates to the field of shape error precision measurement, in particular to a flatness measuring device and a using method thereof.

Background

In modern manufacturing industry, as the requirement of customers on product quality is higher and higher, the detection requirement on products is stricter and stricter. In some mass consumer products, such as a vise, the flatness of the jaws directly affects the quality of the jaws and the service life of the product, so that a fast, high-precision, on-machine flatness measuring device is increasingly favored by manufacturers. The traditional measuring method mainly adopts a contact method, is complex to operate and has low measuring efficiency.

In the existing non-contact flatness measuring method, an optical method is mainly adopted. CN201811574389.5 discloses a non-contact flatness measuring device, which can obtain detection data by reflected light waves through a spectrum processing device, and obtain a plurality of height values of detection points through a movable objective table, wherein the detection speed is slow, and the precision is affected by the motion precision of the objective table; CN2015108558576 discloses a non-contact discontinuous flatness measuring system and method, in which a position sensor is used for detecting to obtain a reference plane, and the data of a measured surface is obtained by a laser displacement sensor, in the method, the measurement precision of the position sensor and the plane motion error of a machine tool directly act on the measurement result, and the precision is limited. CN200910180108.2 discloses a flatness measurement method for cutting tungsten and tungsten alloy devices by slow wire, which is characterized in that a laser, a measured object and an imaging system form a triangular relation, and the measurement data of each point is calculated, wherein the measurement precision is influenced by the error of the motion plane of an object stage in the method. CN201720374711.4 discloses a non-contact laser product detection system, in which a laser generator emits laser, which is reflected on a sample and received by a laser receiver, and the flatness of the product is determined by the difference of optical paths at different positions, which is only suitable for occasions with low precision requirements. CN201811096565.9 discloses a parallelism and flatness measuring device and method for a circular low-rigidity workpiece, which adopts multi-channel ventilation to make the workpiece in a suspension state during measurement, utilizes a motion plane of suspension movement as a reference plane, adopts a distance sensor to perform non-contact measurement, and is only suitable for measuring the flatness and the parallelism of the circular low-rigidity non-magnetic-conductive material workpiece.

Disclosure of Invention

In order to overcome the defects of the technology, the invention aims to provide the flatness measuring device which is convenient to operate, high in detection precision and easy to realize automatic operation and the using method thereof.

In one aspect, the present invention provides a flatness measuring apparatus: including laser gauge head 100, one-dimensional electronic translation platform 200, revolution mechanic 300, by plane 400 and upper computer system 500: the laser probe 100 includes: the device comprises a trigonometry laser sensor 101, a mounting frame 102, a lithium battery 103, a single chip microcomputer system 104, a Bluetooth antenna 105, a translation motor driver 106, a first screw 108, a steel wire thread sleeve 109, a second screw 110, a compression nut 111, a battery pressing plate 112 and a first flange 113; a first screw 108 and wire thread insert 109 clamp the chip microcomputer system 104 and the translation motor drive 106 to the left side 102 of the mounting bracket; the triangular laser sensor 101 is clamped in the middle of the mounting frame 102 by a second screw 110 and a compression nut 111, and the lithium battery 103 is clamped on the right side 102 of the mounting frame by a battery pressing plate 112; the laser measuring head 100 is connected with the one-dimensional electric translation table 200 through a first flange 113; the one-dimensional motorized translation stage 200 is connected to the revolution structure 400 by a second flange 201 arranged at the bottom.

Further, the lithium battery 103 provides power for the triangulation laser sensor 101, the single chip microcomputer system 104, the translation motor driver 106, and the translation motor 202 of the one-dimensional electric translation stage 200.

Further, data acquired by the triangulation laser sensor 101 can be preprocessed by the single chip microcomputer system 104 and then transmitted to the upper computer system 500; the single chip system 104 may provide control commands to the translation motor driver 106.

Further, the revolving structure 300 drives the one-dimensional electric translation stage 200 and the laser measuring head 100 to rotate, so as to realize the circular scanning of the laser to the measured plane 400, and the one-dimensional electric translation stage 200 can adjust the circular scanning radius.

In another aspect, the present invention provides a method for using the above apparatus, comprising the steps of:

1) starting the rotary structure 300 to drive the one-dimensional electric translation table 200 and the laser measuring head 100 to rotate;

2) the single chip microcomputer system 104 controls the one-dimensional electric translation table 200 to move to the position of the maximum scannable circumference radius, the laser measuring head 100 scans the measured plane 400, and the longitudinal and transverse inclination between the measured plane 400 and the plane of the rotary method is measured and calculated;

3) controlling a dovetail sliding table 204 of the one-dimensional electric translation table 200 to move to a position 1 with a specified scanning radius, circularly scanning the laser measuring head 100 at the position 1 to form scanning point cloud data, and calculating the flatness of the circumference after eliminating the inclination influence by an upper computer system according to a flatness evaluation method;

4) repeating the step 3), circularly scanning the laser measuring head 100 at the position N (N =2,3, … N, N > 5), and calculating the flatness of the circumference according to the point cloud data on the measured circumference;

5) and averaging the flatness of the scanning circumference obtained in the step 3) and the step 4) to obtain the actual flatness of the measured plane.

Further, in the above step 2, the circle radius is equal to the distance between the rotation axis and the laser beam, and the maximum scanning circle radius is determined by the stroke range of the one-dimensional motorized translation stage 200 and the size of the plane 400 to be measured.

The beneficial effects of the invention include: the laser measuring head 100 and the one-dimensional electric translation table 200 in the device are powered by the lithium battery 103, and the device does not have winding interference during rotation; the micro trigonometry laser sensor 101 and the small-stroke one-dimensional electric translation table 200 are selected, so that the device has small space and light weight; the single chip microcomputer system is provided with a wireless communication function and can also transmit the measurement result to an upper computer such as a numerical control system. Therefore, the invention can be used independently, and can also be assembled with a process device of a rotary main shaft, such as a machine tool, a robot and the like, to carry out on-machine measurement on the plane of a processing state, thereby improving the production efficiency and the quality of products.

Drawings

FIG. 1 is a schematic view of a flatness measuring apparatus;

FIG. 2 is a schematic view of a laser probe;

FIG. 3 is an electrical connection of a laser probe and a one-dimensional motorized translation stage;

fig. 4 is a schematic view of a measurement model.

In the figure: 100. a laser probe; 200. a one-dimensional motorized translation stage; 300. a revolving structure; 400. a measured plane; 500. an upper computer system; 101. a triangulation laser sensor; 102. a mounting frame; 103. a lithium battery; 104. a single chip system; 105. a Bluetooth antenna; 106. a translation motor driver; 107. a laser beam; 108. a first screw; 109. a steel wire thread insert; 110. a second screw; 111. a compression nut; 112. a battery pressure plate; 113. a first flange; 201. a second flange; 202. a translation motor; 203. a dovetail slide; 204. a dovetail sliding table; 301. a revolving structure frame; 302. a rotating main shaft; 303. and (4) a clamping head.

Detailed Description

The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.

Referring to fig. 1 to 3, a flatness measuring apparatus includes a laser probe 100, a one-dimensional electric translation stage 200, a rotation structure 300, a measured plane 400 and an upper computer system 500, wherein the laser probe 100 is connected to the one-dimensional electric translation stage 200 through a first flange 113; the one-dimensional motorized translation stage 200 is connected to the revolution structure 400 by a second flange 201 arranged at the bottom.

Specifically, the laser probe 100 includes: trigonometry laser sensor 101, mounting bracket 102, lithium cell 103, single chip microcomputer system 104, bluetooth antenna 10), translation motor driver 106, first screw 108, wire swivel nut 109, second screw 110, gland nut 111, battery clamp plate 112 and first flange 113. A first screw 108 and wire thread insert 109 clamp the chip microcomputer system 104 and the translation motor drive 106 to the left side 102 of the mounting bracket. The second screw 110 and the compression nut 111 clamp the triangulation laser sensor 101 in the middle of the mounting block 102 and the lithium battery 103 on the right side 102 of the mounting block with the battery hold down 112.

As a preferred embodiment of the present invention, the lithium battery 103 supplies power to the triangulation laser sensor 101, the single chip microcomputer system 104, the translation motor driver 106, and the translation motor 202 of the one-dimensional electric translation stage 200, and the output voltage of the lithium battery 103 is equal to the driving voltage of the triangulation laser sensor 101 and the translation motor 202.

As a preferred mode of the invention, the data acquired by the trigonometry laser sensor 101 can be preprocessed by the singlechip system 104 and then transmitted to the upper computer system 500 through the Bluetooth antenna 105.

As a preferred mode of the present invention, the one-chip microcomputer system 104 can provide a control command to the translation motor driver 106.

As a preferred mode of the present invention, the rotation structure 300 drives the one-dimensional electric translation stage 200 and the laser probe 100 to rotate, so as to implement circular scanning of the laser on the measured plane 400, and the one-dimensional electric translation stage 200 can adjust the circular scanning radius.

Referring to fig. 4, the method of using the above-described apparatus is implemented as follows.

In the first step, the rotation structure 300 is started to drive the one-dimensional electric translation stage 200 and the laser measuring head 100 to rotate.

And secondly, the singlechip system 104 controls the one-dimensional electric translation table 200 to move to the maximum scannable circumference radius position, the laser measuring head 400 scans the measured plane 400, and the longitudinal and transverse inclination between the measured plane 400 and the plane of the rotary method is measured.

And thirdly, controlling the dovetail sliding table 204 of the one-dimensional electric translation table 200 to move to a position 1 with a specified scanning radius, circularly scanning the laser measuring head 100 at the position 1 to form scanning point cloud data, and calculating the flatness of the circumference after eliminating the inclination influence by the upper computer system according to a flatness evaluation method.

And fourthly, repeating the step 3), circularly scanning the laser measuring head 100 at the position N (N =2,3, … N, N > 5), and calculating the flatness of the circumference according to the point cloud data on the measured circumference.

And fifthly, averaging the flatness of the scanning circumference obtained in the step 3) and the step 4) to obtain the actual flatness of the measured plane.

As a preferable aspect of the present invention, in the step 2, the circumferential radiusrEqual to the distance between the axis of rotation and the laser beam, the maximum scanning circumference radius is determined by the range of travel of the one-dimensional motorized translation stage 200 and the size of the plane 400 being measured.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.

Claims (5)

1. A flatness measuring device comprises a laser measuring head (100), a one-dimensional electric translation table (200), a rotary structure (300), a measured plane (400) and an upper computer system (500):

the laser probe (100) includes: the device comprises a trigonometry laser sensor (101), a mounting rack (102), a lithium battery (103), a single chip microcomputer system (104), a Bluetooth antenna (105), a translation motor driver (106), a first screw (108), a steel wire threaded sleeve (109), a second screw (110), a compression nut (111), a battery pressing plate (112) and a first flange (113); the laser measuring head (100) is connected with the one-dimensional electric translation table (200) through the first flange (113); the one-dimensional electric translation table (200) is connected with the rotary structure (400) through a second flange (201) arranged at the bottom.

2. The flatness measuring device according to claim 1, wherein the lithium battery (103) supplies power to the triangulation laser sensor (101), the single chip microcomputer system (104), the translation motor driver (106), and a translation motor (202) of the one-dimensional motorized translation stage (200).

3. The flatness measuring apparatus according to claim 1, wherein: the rotary structure (300) drives the one-dimensional electric translation table (200) and the laser measuring head to rotate (100), so that circular scanning of the laser to the measured plane (400) is realized, and the circular scanning radius of the one-dimensional electric translation table (200) can be adjusted.

4. A method of using the apparatus of any of claims 1-3, comprising the steps of:

1) starting the rotary structure (300) to drive the one-dimensional electric translation table (200) and the laser measuring head (100) to rotate;

2) the single chip microcomputer system (104) controls the one-dimensional electric translation table (200) to move to the position of the maximum scannable circumference radius, the laser measuring head (100) scans the measured plane (400), and the longitudinal and transverse slopes between the measured plane (400) and the plane of the rotary method are measured;

3) controlling a dovetail sliding table (204) of a one-dimensional electric translation table (200) to move to a position 1 with a designated scanning radius, circularly scanning a laser measuring head at the position 1 to form scanning point cloud data, and calculating the flatness of the circumference after eliminating the influence of the inclination by an upper computer system according to a flatness evaluation method;

4) repeating the step 3), performing circular scanning (N =2,3, … N, N > 5) on the laser measuring head (100) at different positions N, and calculating the flatness of the circumference according to the point cloud data of the measured circle;

5) and averaging the flatness of the scanning circumference obtained in the step 3) and the step 4) to obtain the comprehensive flatness of the measured plane.

5. Use according to claim 4, wherein in step 2 the circumferential radius is equal to the distance between the axis of rotation and the laser beam, the maximum scanning circumferential radius being determined by the range of travel of the one-dimensional motorized translation stage (200) and the dimensions of the plane (400) to be measured.

Images