CN204924205U - Portable two -dimentional follow -up laser surveying device based on laser rangefinder sensor - Google Patents

Abstract

The utility model discloses a portable two-dimensional follow-up laser measuring device based on a laser distance measuring sensor. The slide table is driven by a horizontal drive stepper motor for horizontal X-direction movement, and a horizontal grating ruler is installed on it; the vertical movement component includes a vertical lift slide table, a vertical drive stepper motor and a laser distance measuring sensor; a vertical lift slide The platform is fixed on the horizontal sliding platform, which is driven by a vertically driven stepping motor to move in the vertical Z direction, and a vertical grating ruler is installed on it; the laser ranging sensor is fixed on the vertical lifting sliding platform through a connecting plate. The utility model adopts a two-dimensional measuring platform combined with a laser ranging sensor to realize flatness measurement, and has the advantages of simple operation, large measurable range and high precision.

Description

A portable two-dimensional follow-up laser measuring device based on a laser ranging sensor

technical field

The utility model belongs to the field of multifunctional measuring devices such as flatness and profile, and more specifically relates to a portable two-dimensional follow-up laser measuring device based on a laser ranging sensor.

Background technique

At present, with the rapid development of the electronics industry, various electronic products have larger and larger screens and thinner and thinner screens. When their flatness does not meet the design requirements, a series of problems will occur. Therefore, the detection of flatness It has become a mandatory inspection item in the production process. In order to detect product defects in time, it is necessary to carry out real-time and rapid detection of the flatness of the product in the production process. In addition, in practical applications, it is often necessary to measure and evaluate the cross-section of certain contours , such as wear measurement of rails, contour accuracy evaluation of curved parts, etc.

In the prior art, some designs have been made for flatness measuring devices. For example, CN201410514042.7 discloses a flatness detection device, which includes a length measuring instrument, a one-dimensional mobile platform and a two-dimensional mobile platform, wherein the one-dimensional mobile platform and the two-dimensional mobile platform form a three-dimensional translation platform, which can realize the Flatness detection of 150mm×150mm plane; as another example, CN201320872526.X discloses a flatness laser measuring instrument, which includes a working platform, a three-dimensional moving mechanism, a programmable controller, a laser transmitter, and a laser transmitter in sequence The electrically connected data collector and PC use a three-dimensional moving mechanism and a laser transmitter to realize real-time and rapid detection of product flatness in a non-contact manner, with high detection accuracy. For the evaluation and measurement of curved surface profiles, equipment such as three-coordinate measuring machines is currently mainly used.

However, further research shows that the above existing technologies still have the following defects or deficiencies: they are all measured in three-dimensional coordinates, need to make precise inspection tools, the execution process is cumbersome, and quite complicated pre-work is required, and the detection efficiency is low. , complex structure and cumbersome operation; in addition, when the three-coordinate measurement is applied to high-precision detection, there are problems such as insufficient precision and inconvenient portability.

Utility model content

In view of the above defects or improvement needs of the prior art, the utility model provides a portable two-dimensional follow-up laser measuring device based on a laser ranging sensor, which uses a two-dimensional measuring platform combined with a small laser ranging sensor to achieve high flatness Accuracy measurement, and through the research and design of its key components such as the structure of the horizontal moving component and the vertical moving component and their specific setting methods, the corresponding problems of low measurement accuracy and inconvenient portability can be effectively solved. In addition, the utility model adopts The principle of follow-up control overcomes the shortcomings of ordinary laser ranging sensors, such as small measurement range and unfavorable profile measurement, and has the advantages of high degree of automation, simple operation, large measurable range, and high precision.

In order to achieve the above purpose, the utility model proposes a portable two-dimensional follow-up laser measuring device based on a laser ranging sensor, which is characterized in that it includes a horizontal moving component and a vertical moving component, wherein:

The horizontal movement assembly includes a horizontal movement slide and a horizontal drive stepper motor; the horizontal movement slide is driven by the horizontal drive stepper motor to move in the horizontal X direction, and a horizontal grating ruler is installed on it;

The vertical moving assembly includes a vertical lifting slide, a vertically driven stepper motor and a laser distance measuring sensor; the vertical lifting slide is fixed on the horizontal moving slide, which is driven by the vertical driving step The motor is driven to move in the vertical Z direction, and a vertical grating ruler is installed on it; the laser distance measuring sensor is fixed on the vertical lifting slide table through a connecting plate.

As a further preference, the horizontally driven stepper motor is supported and guided by horizontal guide rails.

As a further preference, the measuring device further includes a display screen, which is used to display the two-dimensional contour curve of the workpiece to be measured.

As a further preference, the vertical position of the workpiece to be measured is calculated by subtracting the position distance measured by the vertical grating ruler from the distance measured by the laser ranging sensor.

As a further preference, the horizontally driven stepper motor and the vertically driven stepper motor respectively drive the linear motion of the horizontally moving sliding table and the vertically elevating sliding table through a ball screw pair transmission.

Generally speaking, compared with the prior art, the above technical solution conceived by the utility model mainly has the following technical advantages:

1. The utility model adopts a two-dimensional measurement platform combined with a portable measurement scheme of a small laser ranging sensor to realize high-precision measurement of flatness. At the same time, the utility model designs a follow-up control device to overcome the small measurement range of ordinary laser ranging sensors. It is not conducive to the disadvantage of contour measurement, so it can replace the current contour measurement equipment of automatic three-coordinate measuring instrument, and realize simple curved surface contour measurement. Measure the contour of the curved surface in the straight plane, the device is light in weight and easy to carry.

2. The utility model also researches and sets the key components in the two-dimensional follow-up laser measuring device, such as the specific structure and specific assembly position of the horizontal moving component and the vertical moving component, and uses the laser ranging sensor and the vertical grating The vertical position of the workpiece is obtained through the cooperation of the horizontal grating ruler, and the horizontal position of the workpiece is obtained by using the horizontal grating ruler. Through the mutual cooperation and joint action of each key component, the measurement of the flatness of the workpiece and the two-dimensional surface profile is realized. It has the advantages of simple operation and large measurable range. , high precision and other advantages.

Description of drawings

Fig. 1 is a perspective view of a two-dimensional servo laser measuring device;

Fig. 2 is a measurement schematic diagram of a two-dimensional servo laser measurement device.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

A portable two-dimensional follow-up laser measurement device based on a laser ranging sensor designed by the utility model is used to realize two-dimensional follow-up non-contact measurement of flatness and curved surface profile, which includes a horizontal moving component and a vertical moving component.

The key components of the present utility model will be described in more detail below one by one.

As one of the key components of the present utility model, as shown in Figure 1, the horizontal movement assembly includes a horizontal movement slide table 2 and a horizontal drive stepper motor 10, and the horizontal movement slide table 2 is driven by the horizontal drive stepper motor 10 for horizontal X direction Movement, a horizontal grating ruler 1 is installed on the horizontal sliding table 2 to accurately measure the position of the horizontal moving sliding table, so that the position of the workpiece measurement point in the horizontal direction can be obtained. The horizontal driving stepper motor 10 is supported and guided by the horizontal guide rail 3 .

As another key assembly of the present utility model, as shown in Figure 1, the vertical mobile assembly includes a vertical lift slide 6, a vertically driven stepper motor 11 and a laser ranging sensor 7, and the vertical lift slide 6 is fixed on Move the sliding platform 2 horizontally to form an XZ two-dimensional follow-up measurement platform, which can move in the horizontal direction with the horizontal moving sliding platform, and the vertical lifting sliding platform 6 is driven by a vertically driven stepping motor 11 for vertical Z direction The vertical grating scale 4 that is used to measure its position is installed on it; The laser ranging sensor 7 is placed vertically for measuring the distance, and it is fixed on the moving end of the vertical lifting slide table 6 by the connecting plate 5, and can be Movement in the vertical direction.

In addition, the two-dimensional follow-up laser measuring device of the present invention is also provided with a control system component 8, the control system component 8 is composed of a single-chip microcomputer system and a stepping motor driver, and is used to control the horizontally moving sliding table 2 and the vertical lifting sliding table 6 process the distance data fed back by the laser ranging sensor 7 , the horizontal grating ruler 1 and the vertical grating ruler 4 and display it on the display screen 9 . Specifically, the single-chip microcomputer system reads the position signal measured by the vertical grating ruler 4 and the laser distance sensor 7 to obtain the position information in the vertical direction, and the single-chip computer system reads the position signal of the horizontal grating ruler 1 to obtain the position information in the horizontal direction, Then draw and display the two-dimensional profile curve on the display screen 9 after the position information in the horizontal direction and the vertical direction is processed, and can be transmitted to the computer for data processing by the data line; the stepper motor driver drives the horizontal drive stepper motor And vertical drive stepper motor, horizontal drive stepper motor 10 and vertical drive stepper motor 11 drive the linear motion of horizontally moving slide table 2 and vertical lifting slide table 6 through ball screw pair transmission respectively.

The operation process and principle of the two-dimensional servo laser measuring device according to the present invention will be explained in detail below.

The follow-up control principle of the utility model is: the laser ranging sensor 7 installed in the vertical direction measures the distance in the vertical direction, and the stepper motor in the vertical direction drives the follow-up modulation according to the distance change in the vertical direction. Straight up and down the slide table 6, the distance between the laser distance measuring sensor 7 and the measuring point of the workpiece to be measured is maintained as a set value d, the set value is for example 30mm, and the laser distance measuring sensor can be kept at the best measurement position by using this distance. Therefore, the laser distance measuring sensor maintains a high measurement accuracy when the contour changes.

The principle of flatness and two-dimensional profile measurement of the present utility model: the vertical direction position of the workpiece is measured by the laser ranging sensor from the distance on the surface of the workpiece 12 to be measured minus the vertical stepping motor measured by the grating ruler in the vertical direction The follow-up position generated by the motion is calculated, and the follow-up position refers to the displacement adjusted by the stepping motor in the vertical direction in order to maintain the distance between the laser distance measuring sensor 7 and the measuring point of the workpiece to be measured; the horizontal position of the measuring point of the workpiece is obtained by It is measured by the grating ruler on the horizontal moving slide table.

During measurement, when measuring the contour information of a vertical section of the free-form surface, the horizontal moving slide 2 moves at a constant speed, and the vertical lifting slide 6 drives the laser distance measuring sensor 7 to move in the vertical direction. When the laser distance measuring sensor 7 When the distance to the measured surface is too close, the vertical lifting slide 6 drives the sensor to rise; when the laser ranging sensor is too far away from the measured surface, the vertical lifting slide 6 drives the sensor to descend, thereby realizing the follow-up in the vertical direction control.

At each moment of measurement, the vertical position of the workpiece and the horizontal position measured by the grating ruler are combined to form the two-dimensional coordinates of the workpiece at that moment, and the flatness of the measured workpiece can be obtained through the collection of positions at all moments The position point set of the measurement data or the two-dimensional contour, the two-dimensional follow-up measuring device of the utility model is connected to the control system component based on the single-chip microcomputer to finally calculate the flatness or the two-dimensional contour. The measurement accuracy of the horizontal direction of the utility model depends on the accuracy of the grating ruler (up to more than 1um), and the accuracy of the vertical direction depends on the minimum accuracy of the grating ruler and the laser ranging sensor (up to more than 1um).

To sum up, the utility model adopts a portable measurement scheme of a two-dimensional measuring platform combined with a small laser ranging sensor, which can realize high-precision measurement of flatness. It is small and not conducive to the disadvantage of contour measurement, so it can replace the current contour measurement equipment of the automatic three-coordinate measuring instrument, and realize simple surface contour measurement. In addition, the portable two-dimensional follow-up laser measuring device of the utility model has a high degree of automation and can easily measure the contour of a curved surface in a vertical plane. The device is less than 15 kg and is easy to carry. Measurement of steel plate plane, hub outer circle section, taper hole section, etc.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and modifications made within the spirit and principles of the utility model Improvements and the like should all be included within the protection scope of the present utility model.

Claims (5)

1. A portable two-dimensional follow-up laser measuring device based on a laser rangefinder, characterized in that it comprises a horizontal movement assembly and a vertical movement assembly, wherein: The horizontal movement assembly includes a horizontal movement slide (2) and a horizontal drive stepper motor (10); the horizontal movement slide (2) is driven by the horizontal drive stepper motor (10) to move horizontally in the X direction, A horizontal grating ruler (1) is installed on it; The vertical movement assembly includes a vertical lift slide (6), a vertically driven stepper motor (11) and a laser distance measuring sensor (7); the vertical lift slide (6) is fixed on the horizontal movement On the slide table (2), it is driven by the vertically driven stepping motor (11) to move vertically in the Z direction, and a vertical grating ruler (4) is installed on it; the laser distance measuring sensor (7) passes The connecting plate (5) is fixed on the vertical lift slide (6). 2. The portable two-dimensional follow-up laser measuring device based on a laser ranging sensor according to claim 1, characterized in that, the horizontal drive stepper motor (10) is supported and guided by a horizontal guide rail (3). 3. The portable two-dimensional follow-up laser measuring device based on laser ranging sensor as claimed in claim 2, is characterized in that, described measuring device also comprises display screen (9), and described display screen (9) is used for displaying A two-dimensional contour curve of the workpiece (12) to be measured. 4. The portable two-dimensional follow-up laser measuring device based on the laser distance measuring sensor as claimed in claim 3, wherein the position of the vertical direction of the workpiece to be measured (12) is passed through the laser distance measuring sensor (7). ) is calculated by subtracting the distance measured by the vertical grating ruler (4) from the distance measured. 5. the portable two-dimensional follow-up laser measurement device based on the laser ranging sensor as claimed in claim 4, is characterized in that, described horizontal drive stepper motor (10) and vertical drive stepper motor (11) pass through respectively The ball screw pair is driven to drive the linear motion of the horizontal moving slide table (2) and the vertical lifting slide table (6).