阅读说明：本技术 一种非接触式激光测量系统及其测量方法 (non-contact laser measurement system and measurement method thereof ) 是由 于殿泓 周小亮 李琳 张辉 于 2019-08-12 设计创作，主要内容包括：本发明公开了一种非接触式激光测量系统及其测量方法,包括测头,测头包括圆弧轨道,圆弧轨道上活动连接有激光传感器,圆弧轨道上同心设置有拾取激光传感器运动角度的感应同步器,圆弧轨道连接有连接轴,连接轴上设置有编码器。测量灵活、测量范围广,能拓展测量功能,提高测量精度。(The invention discloses a non-contact laser measuring system and a measuring method thereof, wherein the measuring head comprises an arc track, a laser sensor is movably connected on the arc track, an induction synchronizer for picking up the motion angle of the laser sensor is concentrically arranged on the arc track, the arc track is connected with a connecting shaft, and an encoder is arranged on the connecting shaft. The measurement is flexible, the measurement range is wide, the measurement function can be expanded, and the measurement precision is improved.)

1. The non-contact laser measuring system is characterized by comprising a measuring head, wherein the measuring head comprises an arc track (1), a laser sensor (2) is movably connected onto the arc track (1), an induction synchronizer (3) for picking up the motion angle of the laser sensor (2) is concentrically arranged on the arc track (1), the arc track (1) is connected with a connecting shaft (4), and an encoder (5) is arranged on the connecting shaft (4).

2. The non-contact laser measuring system according to claim 1, further comprising a driving device, wherein the driving device comprises a workbench (6), a pair of slide rails (7) is arranged on the workbench (6) in parallel, the non-contact laser measuring system further comprises a cross beam (8), a slide block (9) is sleeved on the cross beam (8), and one end of the connecting shaft (4) vertically penetrates through the slide block (9) downwards to be connected with the circular arc track (1); the two ends of the cross beam (8) are respectively and vertically connected with sliding rods (10), and each sliding rod (10) is movably connected with a corresponding sliding rail (7).

3. A contactless laser measuring system according to claim 1 or 2, characterized in that the circular arc track (1) is provided with a ball (11) movable along it, and the laser sensor (2) is fixed on the ball (11).

4. A measuring method of a non-contact laser measuring system comprising the measuring system of any one of claims 1-3, characterized by comprising the steps of:

Step 1, determining the origin position and the initial position of a coordinate system of a measuring head;

Step 2, adjusting the light beam of the laser sensor (4) to reach a measured point;

Step 3, acquiring the rotation angle of the measuring head and the vertical distance L from the original point of the coordinate system of the measuring head to the measured point, and obtaining the position coordinate of the measured point according to the rotation angle of the measuring head, the distance L and the original point of the coordinate system of the measuring head, wherein the position coordinate of the measured point is the position coordinate relative to the original point of the coordinate system of the measuring head;

And 4, converting the position coordinates of the measured point obtained in the step 3 into position coordinates relative to the origin of the three-coordinate system.

5. The method according to claim 4, wherein the origin of the coordinate system of the measuring head in step 1 is the center (x) of the circular arc track (5)₀，y₀，z₀)。

6. The method according to claim 5, wherein the step 2 is: the position of the measuring head in X, Y, Z three directions is adjusted by a driving device, so that the light beam of the laser sensor (4) reaches the measured point.

7. The method according to claim 5 or 6, wherein the step 2 is: in the measured range, the laser sensor (4) is driven to move on the circular arc track (5), so that the light beam of the laser sensor (4) reaches the measured point.

8. The method according to claim 7, wherein the step 3 is: the rotation angle alpha of the laser sensor (4) is obtained through the induction synchronizer (9)₁the position coordinates (x) of the measured point are obtained by the following formula₁,y₁,z₁)：

L₁＝L×secα₁ (1)；

x₀＝x₁ (2)；

|z₁-z₀|＝L₁×cosα₁ (3)；

|y₁-y₀|＝L₁×sinα₁ (4)；

Wherein the distance L is measured by a laser sensor (4).

9. The method according to claim 5 or 6, wherein the step 2 is: in the measured range, the connecting shaft (4) is driven to rotate the arc track (5), and the laser sensor (4) is driven to move on the arc track (5) at the same time, so that the light beam of the laser sensor (4) reaches the measured point.

10. The method according to claim 9, wherein the step 3 is: the rotation angle alpha of the laser sensor (4) on the arc track (5) is obtained through the circle induction synchronizer (9)₂The rotation angle beta of the circular arc track (5) is obtained by a rotary encoder (8)₂Then the following formula obtains the position coordinates (x) of the measured point₂，y₂，z₂)：

L₂＝L×secα₂ (5)；

|z₂-z₀|＝L₂×cosα₂ (6)；

|y₂-y₀|＝L₂×sinα₂×cosβ₂ (7)；

|x₂-x₀|＝L₂×cosα₂×sinβ₂ (8)。

Technical Field

The invention belongs to the technical field of geometric measurement tools, relates to a non-contact laser measurement system and further relates to a measurement method of the measurement system.

background

The three-coordinate measuring machine is an advanced instrument with high precision, high efficiency and multifunction measurement, can measure the size, shape and mutual position of complex three-dimensional parts, and can realize the automation of the whole measuring process and the digitization of data processing, thereby being widely applied. In the whole measuring system of the three-coordinate measuring machine, the position information of the measured object is picked up by the measuring head. Except for the mechanical body and external factors, the measuring head is the key for realizing high-precision measurement of the measuring machine. The working efficiency, the measuring function, the precision and the like of the three-coordinate measuring machine are closely related to the measuring head, so that the advanced measuring head is one of important conditions for ensuring the measuring precision, the measuring function and the measuring efficiency of the three-coordinate measuring machine.

The traditional three-coordinate measuring machine inevitably has measurement errors in the measuring process due to the influence of factors such as structure, measuring principle, environment, human factors and the like, thereby reducing the measuring precision. In the measuring process, due to the limitation of the traditional measuring head structure, the related geometric elements of small holes, deep blind holes, inclined holes and the like cannot be measured; when a soft material and an ultrathin workpiece are measured, the workpiece is deformed by the contact pressure of a measuring head and the workpiece, the actual size of the measured object cannot be accurately measured, and the measuring head is abraded; during data processing, measurement head radius compensation is required to be carried out on the measurement data, and workload is increased.

Disclosure of Invention

The invention aims to provide a non-contact laser measuring system, which solves the problem that the size of a special type of workpiece cannot be accurately measured in the prior art.

The technical scheme includes that the non-contact laser measuring system comprises a measuring head, wherein the measuring head comprises an arc track, a laser sensor is movably connected to the arc track, a sensing synchronizer for picking up the movement angle of the laser sensor is concentrically arranged on the arc track, the arc track is connected with a connecting shaft, and an encoder is arranged on the connecting shaft.

The invention is also characterized in that:

The device also comprises a driving device, wherein the driving device comprises a workbench, a pair of slide rails is arranged on the workbench in parallel, the device also comprises a cross beam, a slide block is sleeved on the cross beam, and one end of a connecting shaft vertically penetrates through the slide block downwards to be connected with the arc track; the two ends of the cross beam are respectively and vertically connected with a slide bar, and each slide bar is movably connected with a corresponding slide rail.

The arc track is provided with a ball capable of moving along the arc track, and the laser sensor is fixed on the ball.

Another object of the present invention is to provide a measuring method of a non-contact laser measuring system.

another technical solution adopted by the present invention is a measuring method of a non-contact laser measuring system, including the above measuring system, characterized by comprising the steps of:

step 1, determining the origin position and the initial position of a coordinate system of a measuring head;

Step 2, adjusting the light beam of the laser sensor to reach a measured point;

Step 3, acquiring the rotation angle of the measuring head and the vertical distance L from the original point of the coordinate system of the measuring head to the measured point, and obtaining the position coordinate of the measured point according to the rotation angle of the measuring head, the distance L and the original point of the coordinate system of the measuring head, wherein the position coordinate of the measured point is the position coordinate relative to the original point of the coordinate system of the measuring head;

And 4, converting the position coordinates of the measured point obtained in the step 3 into position coordinates relative to the origin of the three-coordinate system.

In step 1, the origin of the coordinate system of the measuring head is the circle center (x) of the circular arc orbit₀，y₀，z₀)。

The step 2 is as follows: the position of the measuring head in X, Y, Z three directions is adjusted by the driving device, so that the light beam of the laser sensor reaches the measured point.

the step 2 is as follows: in the measured range, the laser sensor is driven to move on the circular arc track, so that the light beam of the laser sensor reaches the measured point.

The step 3 is: obtaining the rotation angle alpha of the laser sensor through the induction synchronizer₁the position coordinates (x) of the measured point are obtained by the following formula₁，y₁，z₁)：

L₁＝L×secα₁ (1)；

x₀＝x₁ (2)；

|z₁-z₀|＝L₁×cosα₁ (3)；

|y₁-y₀|＝L₁×sinα₁ (4)；

Wherein the distance L is measured by a laser sensor.

The step 2 is as follows: in the measured range, the connecting shaft is driven to rotate the arc track, and the laser sensor is driven to move on the arc track, so that the light beam of the laser sensor reaches the measured point.

The step 3 is: obtaining the rotation angle alpha of the laser sensor on the circular arc track through the circular induction synchronizer₂Acquiring the rotation angle beta of the circular arc track through a rotary encoder₂Then the following formula obtains the position coordinates (x) of the measured point₂，y₂，z₂)：

L₂＝L×secα₂ (5)；

|z₂-z₀|＝L₂×cosα₂ (6)；

|y₂-y₀|＝L₂×sinα₂×cosβ₂ (7)；

|x₂-x₀|＝L₂×cosα₂×sinβ₂ (8)。

The invention has the beneficial effects that:

The non-contact laser measuring system takes the light beam as a measuring means, and the measuring system does not directly contact with a measured object, so that the measuring error caused by contact deformation is eliminated; on the basis of the traditional three-dimensional linear motion, the two-dimensional angle rotation of the measuring head is realized through the arc track, the ball and the connecting shaft, and the geometric measurement can be carried out on various soft materials, easily-deformed workpieces and special-shaped curved surfaces; the measuring method has the advantages of flexible measurement and wide measuring range, and can expand the measuring function and improve the measuring precision.

Drawings

FIG. 1 is a schematic diagram of a non-contact laser measurement system according to the present invention;

FIG. 2 is a schematic diagram of a probe structure of a non-contact laser measurement system according to the present invention;

FIG. 3 is a schematic diagram of the operation of a non-contact laser measurement system of the present invention;

FIG. 4 is a schematic diagram of a non-contact laser measurement system according to the present invention;

FIG. 5 is a schematic plan view of a non-contact laser measurement system according to the present invention.

In the figure, 1, an arc track, 2, a laser sensor, 3, an induction synchronizer, 4, a connecting shaft, 5, an encoder, 6, a workbench, 7, a sliding rail, 8, a cross beam, 9, a sliding block, 10, a sliding rod and 11, and balls.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The utility model provides a non-contact laser measurement system, as shown in figure 1, includes the gauge head, and the gauge head includes circular arc track 1, swing joint has laser sensor 2 on the circular arc track 1, as shown in figure 2, is provided with ball 11 on the circular arc track 1, and laser sensor 2 fixes on ball 11, and ball 11 drives laser sensor 2 and moves on circular arc track 1, and the light that laser sensor 2 sent all passes through the centre of a circle of circular arc track 1 at arbitrary moment. The induction synchronizer 3 is concentrically arranged on the circular arc track 1, a stator of the induction synchronizer 3 is arranged at the central position of the circular arc track 1, a rotor is arranged on the laser displacement sensor 2, and the induction synchronizer 3 is used for picking up the movement angle of the laser sensor 2 on the circular arc track 1.

the laser sensor 2 is a laser displacement sensor, and the type of the laser displacement sensor is any one of MPS-XXXS, IL-300 and TFmini Plus.

The induction synchronizer 3 is a rotary induction synchronizer, which is model GJDCJXT or T2.

As shown in fig. 3, the laser sensor 2 can make circular motion on the circular arc track 1, and the rotational angle α is picked up by the induction synchronizer 3, which defines that the counterclockwise rotation from the starting point of the measuring head is positive, the interval is (0-90 °), the clockwise rotation from the starting point of the measuring head is negative, and the interval is (-90 ° -0), so that the laser sensor 2 can rotate at any angle within the measured range. The geometric measurement of any angle in the measured range can be realized, and a measurement result with higher precision can be obtained for the special-shaped curved surface. The circular arc track 1 is connected with a connecting shaft 4, an encoder 5 is arranged on the connecting shaft 4, the encoder 5 is used for picking up a rotating angle beta of the circular arc track 1 around the connecting shaft 4, and the interval is defined to be positive when the circular arc track rotates clockwise around a z axis and is (0-180 degrees), and the interval is negative when the circular arc track rotates anticlockwise around the z axis and is (-180-0 degrees).

The device also comprises a driving device, the driving device comprises a workbench 6, a pair of slide rails 7 is arranged on the workbench 6 in parallel, the device also comprises a cross beam 8, a slide block 9 is sleeved on the cross beam 8, and one end of a connecting shaft 4 vertically penetrates through the slide block 9 downwards to be connected with the arc track 1; two ends of the cross beam 8 are respectively and vertically connected with a slide bar 10, and each slide bar 10 is movably connected with a corresponding slide rail 7.

A measuring method of a non-contact laser measuring system comprises the measuring system, and is characterized by comprising the following steps:

Step 1, determining the origin position of the coordinate system of the measuring head as the center (x) of a circle of the circular arc track 1₀，y₀，z₀) During measurement, the initial state of the measuring head is also determined, and when the laser sensor 2 moves on the circular arc track 1, the position of the laser sensor 1 vertical to the worktable 6 is used as the initial position of the measuring head. When the circular arc orbit 1 rotates, the circular arc orbit is parallel to the yoz surface as the initial position of the circular arc orbit. When the measured object is measured, the rotation angle of the circular arc track 1 and the rotation angle of the laser sensor 2 are both angles relative to the initial state of the measuring head system.

Step 2, adjusting the light beam of the laser sensor 4 to reach a measured point;

Step 3, acquiring the rotation angle of the measuring head and the vertical distance L from the original point of the coordinate system of the measuring head to the measured point, and obtaining the position coordinate of the measured point according to the rotation angle of the measuring head, the distance L and the original point of the coordinate system of the measuring head, wherein the position coordinate of the measured point is the position coordinate relative to the original point of the coordinate system of the measuring head;

And 4, converting the position coordinates of the measured point obtained in the step 3 into position coordinates relative to the origin of the three-coordinate system.

As shown in fig. 4, the coordinates of the point C obtained by measurement at the time of measurement are the origin B with respect to the coordinate system of the stylus₁And the origin B of the coordinate system of the probe₁and has a definite relative relation with a three-coordinate origin O in the whole measurement process. Thus, the position coordinates of the measured point C can be mapped into a three-coordinate system. Similarly, the position coordinates of the measured point D and the coordinates of all the measured points can be mapped into a three-coordinate system, so that the coordinates are unified.