Calibration tool for target ball positioning device of laser tracker

Abstract

The utility model relates to a calibration tool for a target ball positioning device of a laser tracker. The calibration tool comprises a rocker (1), a fixing rod (2), a retaining rod (4), connecting screws (3 and 5), a positioning block (6) and a base (7). According to the utility model, the current situation that the laser tracker positioning device is clamped by a vice is changed. Locking is carried out through the rocker, and the problems that due to the fact that the size of the laser tracker positioning device is too small, clamping is not stable, the covering area is too large, the sampling point requirement in the measuring process is guaranteed, the clamping force is uncontrollable, and the working face of the laser tracker positioning device is prone to being damaged are solved. And different fixing blocks can be selected for clamping according to different types of target balls and / or ball seats of the laser tracker, so that the universality is wide.

Description

Technical Field

[0001] This utility model relates to laser length calibration technology, specifically a calibration fixture for a laser tracker target ball positioning device. Background Technology

[0002] The operation mode of a laser tracker involves using a target sphere and target mount to measure the coordinates of multiple points on the surface or edge to be measured. Multi-point fitting calculations or spatial analysis are then performed to obtain the actual coordinates. Accurate positioning of the target sphere is crucial throughout the measurement process, and this position is determined by the laser tracker's positioning device. Therefore, the positioning device is indispensable and extremely important in the entire use of the laser tracker. Current methods for calibrating the laser tracker's positioning device are very limited, often involving simple clamping with a vise followed by the positioning device holding the target sphere for measurement. During measurement, a coordinate measuring machine is used to collect data from both the laser tracker's target sphere and the positioning device. Software analysis of the collected data confirms the accuracy of the laser tracker's positioning device. Because the laser tracker's positioning device needs to be used with various sizes of target spheres in different applications, there are numerous models and sizes of laser tracker positioning devices available. Using only a vise for clamping is not only inconvenient, but also results in unstable clamping, affecting the measurement process, and the uncontrollable clamping force can cause significant damage to the surface of the laser tracker positioning device, impacting subsequent normal use. Measuring the laser tracker positioning device using a coordinate measuring machine (CMM) for point acquisition and analysis is also problematic because the clamping position is uncertain each time, requiring multiple point acquisitions for each measurement, making the operation complex and unsuitable for large-scale measurements. When dealing with a large number of target seats, the measurement process becomes cumbersome and complex, with unstable clamping, numerous repetitions, and low measurement efficiency. This device, designed and used in our factory, boasts low manufacturing costs, a simple manufacturing process, ease of operation, and good stability. The calibration fixture base is made of lightweight and highly flexible material. It is suitable for both single and large-scale measurements and is applicable to different models of laser tracker positioning devices. Utility Model Content

[0003] The purpose of this invention is as follows: First, different fixing devices are selected for installation and positioning based on different models of the laser tracker positioning device. Second, the fixing devices are connected to the calibration fixture base with screws. The selection of fixing devices ensures that the installation position of the same model of laser tracker positioning device is consistent each time. The calibration fixture has 2mm countersunk holes for positioning, ensuring that the laser tracker positioning device can be installed through the holes. Similarly, setting the depth ensures that the installation height is consistent each time. Furthermore, it minimizes obstruction of large working surfaces during clamping, reducing the difficulty of coordinate measuring machine (CMM) measurement and ensuring accurate sampling points. By determining multiple clamping positions and methods, it minimizes the repetition of sampling points during CMM measurement. By determining the positions of a few simple points, an automatic measurement program can be directly executed, simplifying the CMM measurement process, enabling large-scale measurement, and improving efficiency. The structure is entirely mechanical, offering good stability, long service life, and convenient operation.

[0004] The technical solution of this utility model is:

[0005] A calibration fixture for a laser tracker target ball positioning device is provided, comprising a rocker arm 1, a fixing rod 2, a retaining rod 4, connecting screws 3 and 5, a positioning block 6, and a base 7;

[0006] The positioning block has horizontal double lugs, and the root of the horizontal double lugs forms an open circular groove. The open circular groove matches the ball seat of the target ball of the laser tracker. By deforming and clamping the horizontal double lugs, the ball seat can be clamped in the open circular groove.

[0007] At least one of the horizontal double lugs has a threaded hole in its lug hole. The two lug holes are coaxial. The rocker arm 1 passes through the two lug holes and engages with the threaded hole through an external thread. When the rocker arm is rotated in the forward direction, the two lugs will deform and clamp towards each other. When the rocker arm is rotated in the reverse direction, the two lugs will deform and open away from each other.

[0008] The positioning block 6 has a connecting through hole, and the base has a connecting hole. The positioning block can be fixed to the upper surface of the base by connecting screws.

[0009] A column 2 is fixed on the positioning block 6 or the base, and a retaining rod 4 is horizontally extended on the column. The retaining rod is used to press down on or hold the laser tracker target ball on the ball seat to prevent the laser tracker target ball from falling out of the ball seat.

[0010] Furthermore, the positioning block is a component, in which each positioning block differs only in the inner diameter of the open circular groove, used to match ball seats of different sizes.

[0011] Furthermore, the width of the opening circular groove is at least 2 mm.

[0012] Furthermore, one end of the rocker arm 1 forms a curved handle.

[0013] Furthermore, the positioning block 6 has a positioning hole, and the base has a positioning hole, and the positioning pin is positioned on the upper plane of the base corresponding to the positioning block.

[0014] Furthermore, there are multiple connecting through holes.

[0015] Furthermore, one of the horizontal double lugs has a threaded hole, and the other lug has a through hole.

[0016] Furthermore, both ear holes in the horizontal double ear pieces are threaded holes, and the two threaded holes rotate in opposite directions.

[0017] In use, select the appropriate positioning block based on the model of the target ball and / or ball seat of the laser tracker. Then, install the positioning device on the base 7 using screws 3 and 5. The open circular groove of the positioning block ensures that the target ball and / or ball seat of the same model are installed in the same position. It also exposes the working surface of the target ball to meet the point sampling requirements during the coordinate measuring machine measurement process. Each component is removable, making replacement convenient and simple. The calibration fixture is made of aluminum, which is lightweight and flexible. All structures are mechanical, simple to use, stable, and not easily damaged. There are no electronic components, making operation simple.

[0018] The advantages of this invention are: It changes the current practice of using a vise to clamp the positioning device of a laser tracker. Locking is achieved via a rocker arm, solving the problems of unstable clamping due to the small size of the laser tracker positioning device, excessively large coverage area, difficulty in ensuring point sampling requirements during measurement, and uncontrollable clamping force that could easily damage the working surface of the laser tracker positioning device. Furthermore, different fixing blocks can be selected for clamping depending on the model of the laser tracker target ball and / or ball seat, offering wide versatility. The positioning block is a component; by ensuring the same clamping position each time, it reduces the point sampling process for determining the measurement position of the laser tracker target ball during measurement. It can directly execute programs for automatic measurement, reducing the process of determining the position of the laser tracker positioning device during measurement, simplifying the measurement process, enabling large-scale measurements, and improving efficiency. The structure is entirely mechanical, offering good stability, long service life, and convenient operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the target ball installation method;

[0021] Figure 3 Joystick structure diagram

[0022] Figure 4 This is a sectional view of the fixing block structure (one lug hole is a threaded hole, and the other lug hole is a through hole);

[0023] Figure 5 This is a top view of a fixed block structure;

[0024] The components include: rocker arm 1, column 2, positioning pin 3, retaining rod 4, connecting screw 5, positioning block 6, base 7, threaded hole 8, through hole 9, and open circular groove 10. Detailed Implementation

[0025] The disclosed examples will be described more fully with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described, and these examples should not be construed as limited to those set forth herein. Rather, these examples are described so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0026] A calibration fixture for a laser tracker target ball positioning device is provided, comprising a rocker arm 1, a fixing rod 2, a retaining rod 4, connecting screws 3 and 5, a positioning block 6, and a base 7;

[0027] The positioning block has horizontal double lugs, and the root of the horizontal double lugs forms an open circular groove. The open circular groove matches the ball seat of the target ball of the laser tracker. By deforming and clamping the horizontal double lugs, the ball seat can be clamped in the open circular groove.

[0028] At least one of the horizontal double lugs has a threaded hole in its lug hole. The two lug holes are coaxial. The rocker arm 1 passes through the two lug holes and engages with the threaded hole through an external thread. When the rocker arm is rotated in the forward direction, the two lugs will deform and clamp towards each other. When the rocker arm is rotated in the reverse direction, the two lugs will deform and open away from each other.

[0029] The positioning block 6 has a connecting through hole, and the base has a connecting hole. The positioning block can be fixed to the upper surface of the base by connecting screws.

[0030] A column 2 is fixed on the positioning block 6 or the base, and a retaining rod 4 is horizontally extended on the column. The retaining rod is used to press down on or hold the laser tracker target ball on the ball seat to prevent the laser tracker target ball from falling out of the ball seat.

[0031] The positioning block is a component, in which each positioning block has a different inner diameter of the open circular groove, used to match ball seats of different sizes.

[0032] The width of the open circular groove is at least 2 mm.

[0033] One end of the rocker arm 1 forms a curved handle.

[0034] The positioning block 6 has a positioning hole, and the base has a positioning hole. The positioning pin is positioned on the upper plane of the base corresponding to the positioning block.

[0035] There are two connecting through holes.

[0036] One of the horizontal double lugs has a threaded hole, and the other lug has a through hole.

[0037] Descriptions of various advantageous arrangements have been shown for illustrative and descriptive purposes, but such descriptions are not intended to be exclusive or limited to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. Furthermore, different advantageous examples may describe different advantages compared to other advantageous examples. One or more examples have been selected and described in order to best illustrate the principles and practical application of the examples, and to enable those skilled in the art to understand that this disclosure contains various examples with various modifications suitable for the particular intended use.

Claims

1. A calibration fixture for a laser tracker target sphere positioning device, characterized in that: Includes a rocker arm (1), a column (2), a retaining rod (4), connecting screws (3, 5), a positioning block (6), and a base (7); The positioning block has horizontal double lugs, and the root of the horizontal double lugs forms an open circular groove. The open circular groove matches the ball seat of the target ball of the laser tracker. By deforming and clamping the horizontal double lugs, the ball seat can be clamped in the open circular groove. At least one of the horizontal double ear pieces has a threaded hole in the ear piece hole. The two ear piece holes are coaxial. The rocker (1) passes through the two ear piece holes and engages with the threaded hole through the external thread. When the rocker is rotated in the forward direction, the two ear pieces will deform and clamp towards each other. When the rocker is rotated in the reverse direction, the two ear pieces will deform and open away from each other. The positioning block (6) has a connecting through hole, and the base has a connecting hole. The positioning block can be fixed to the upper surface of the base by connecting screws. A column (2) is fixed on the positioning block (6) or the base, and a retaining rod (4) is horizontally extended on the column. The retaining rod is used to press down or hold the laser tracker target ball on the ball seat to prevent the laser tracker target ball from falling out of the ball seat.

2. The calibration fixture for a laser tracker target sphere positioning device as described in claim 1, characterized in that: The positioning block is a component, in which each positioning block has a different inner diameter of the open circular groove, used to match ball seats of different sizes.

3. The calibration fixture for a laser tracker target sphere positioning device as described in claim 1, characterized in that: The width of the open circular groove is at least 2 mm.

4. The calibration fixture for a laser tracker target ball positioning device as described in claim 1, characterized in that: One end of the rocker (1) forms a curved handle.

5. The calibration fixture for a laser tracker target sphere positioning device as described in claim 1, characterized in that: The positioning block has a positioning hole, and the base has a positioning hole. The positioning pin is used to position the positioning block on the upper plane of the base.

6. The calibration fixture for a laser tracker target sphere positioning device as described in claim 1, characterized in that: There are multiple connecting through holes.

7. The calibration fixture for a laser tracker target ball positioning device as described in claim 1, characterized in that: One of the horizontal double lugs has a threaded hole, and the other lug has a through hole.

8. The calibration fixture for a laser tracker target sphere positioning device as described in claim 1, characterized in that: Both lug holes in the horizontal double lugs are threaded holes, and the two threaded holes rotate in opposite directions.

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