A method for detecting and adjusting the height of a spherical screw

Abstract

The application discloses a kind of detection adjustment methods of spherical screw height, utilize height detection tool to carry out height detection, the method for detecting spherical screw height includes the following steps: S1. utilize laser tracker to construct measurement space coordinate system 1;S2. arbitrarily select one spherical screw as first spherical screw, in space coordinate system 1, the top ball center coordinates of first spherical screw are measured;S3. detection sleeve is sleeved to first spherical screw, target ball is placed in the ball slot of detection sleeve, in space coordinate system 1, the ball center coordinates of target ball are measured;S4. form space coordinate system 2.The application is measured by using detection tool, only needs to carry out multipoint measurement to first spherical screw, thereafter other spherical screw is directly adjusted height according to target ball coordinate, need not again carry out multipoint measurement one by one, can be time-consuming less, it is easy to operate, stability is good, improve work efficiency, solve the problem of low efficiency of detecting spherical screw height.

Description

Technical Field

[0001] This invention belongs to the field of detection technology, specifically relating to a method for detecting and adjusting the height of a spherical screw. Background Technology

[0002] One of the key components of the spherical screw-type heliostat assembly platform, the spherical screw-type heliostat assembly platform is referenced from the applicant's earlier Chinese invention patent application, publication number CN113399220A, entitled "A Method for Filling Glue into a Large Heliostat." A heliostat is generally composed of multiple sub-mirrors assembled on an assembly platform to form a large mirror with a certain curvature, in order to focus solar radiation onto a tower-type receiver. The heliostat assembly platform is equipped with a large number of identical spherical screws, one end of which is spherical. The spherical part contacts the mirror. By precisely detecting and adjusting the height of the spherical screws, these screws are made to form the required curvature. Sub-mirrors are placed on these spherical screws and assembled to obtain the designed heliostat.

[0003] The height of the spherical screw refers to the distance from the center of the small ball at the top of the screw to the reference surface. However, this reference surface is a virtual plane in space, not a physical surface. Furthermore, the assembly platform is quite large, making it impossible to measure using conventional measuring tools. Therefore, a laser tracker is required to conduct relevant measurements and use its "adjustment" function to guide the adjustment of the spherical screw height. After the height adjustment is in place, the spherical screw needs to be re-measured to check whether it meets the design requirements.

[0004] Because the laser tracker needs to measure four points on the surface of the ball at the top of the screw to obtain the coordinates of the ball's center, and adjusting the height of a spherical screw requires at least two checks, a total of at least eight points need to be measured on the ball at the top of the screw to complete the height adjustment. Since there are a large number of spherical screws that need to be adjusted, if each spherical screw needs to have eight points measured to complete the inspection fixture, it will take a long time, increase the labor intensity of the inspection personnel, and reduce work efficiency. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a method for detecting and adjusting the height of a spherical screw. By using a detection fixture, only the first spherical screw needs to be measured at multiple points. Subsequently, the height of other spherical screws can be adjusted directly based on the target ball coordinates, eliminating the need for repeated multi-point measurements. This method is time-efficient, convenient to operate, and provides good stability, thereby improving work efficiency and solving the problem of low efficiency in detecting the height of spherical screws.

[0006] The embodiments of the present invention are achieved through the following technical solutions:

[0007] A method for detecting and adjusting the height of a spherical screw, wherein a height detection fixture is used for height detection. The height detection fixture includes a laser tracker and a detection sleeve. The detection sleeve has a central blind hole into which the spherical screw can be inserted. The outer end face of the closed end of the detection sleeve has a ball-placement groove for placing a target ball.

[0008] The method for detecting the height of the spherical screw includes the following steps:

[0009] S1. Construct a measurement space coordinate system 1 using a laser tracker;

[0010] S2. Arbitrarily select a spherical screw as the first spherical screw. In the spatial coordinate system 1, measure the coordinates of the center of the top ball of the first spherical screw and obtain the height value H of the center of the top ball.

[0011] S3. Fit the detection sleeve onto the first spherical screw, place the target ball in the ball placement groove of the detection sleeve, measure the coordinates of the center of the target ball in the spatial coordinate system 1, and obtain the height value L of the center of the target ball;

[0012] S4. Calculate the distance D between the center of the target ball and the center of the small ball at the top of the first spherical screw. Move the spatial coordinate system 1 up by a distance D along the Z-axis to form the spatial coordinate system 2.

[0013] S5. In spatial coordinate system 2, use a laser tracker to re-measure the coordinates of the target ball's center and obtain the height value of the target ball's center. If the height value of the target ball's center does not meet the design requirements, adjust the first spherical screw until the design requirements are met.

[0014] S6. Install the test sleeves onto the other spherical screws one by one, and adjust and measure according to step S5.

[0015] In one embodiment of the present invention, the distance D between the center of the target ball and the center of the top ball of the first spherical screw is calculated by subtracting the height H of the center of the top ball from the height L of the target ball.

[0016] In one embodiment of the present invention, the cross-section of the bottom end of the central blind hole is tapered.

[0017] In one embodiment of the present invention, the central blind hole is clearance-fitted with the spherical screw.

[0018] In one embodiment of the present invention, the cross-section of the ball placement groove is conical.

[0019] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0020] This invention utilizes a height detection fixture. First, the Z-axis coordinate of the target ball (i.e., the height of the target ball) is linked to the height of the spherical screw on the first spherical screw. Then, the height of the first spherical screw is adjusted, which means adjusting the Z-axis coordinate of the target ball, until the Z-axis coordinate of the target ball meets the design requirements, i.e., the height of the first spherical screw meets the design requirements. Afterward, for other spherical screws, the height detection fixture is directly installed on the spherical screw, and only the Z-axis coordinate of the target ball needs to be adjusted to the design value. Compared with existing technologies, only the first spherical screw requires multi-point measurement to obtain the center of the top ball. Once the Z-axis coordinate of the target ball is linked to the height of the spherical screw, other spherical screws no longer require multi-point measurement or measurement of the spherical shape of the top ball; only the Z-axis coordinate of the target ball needs to be adjusted to the design value. This facilitates quick adjustment by operators. The method for detecting the height of spherical screws in this application has good stability, improves work efficiency, and solves the problem of low efficiency in detecting the height of spherical screws. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a flowchart of the method for detecting the height of the spherical screw in this invention;

[0023] Figure 2 This is a schematic diagram of the tooling used for detecting the height of the spherical screw in this invention;

[0024] Figure 3 This is a schematic diagram of the detection sleeve in this invention;

[0025] Figure 4 This is a schematic diagram illustrating the establishment of a coordinate system for the height fixture in this invention during use.

[0026] Icons: 1-Detection sleeve, 11-Central blind hole, 12-Ball groove, 2-Target ball, 3-Spherical screw, 31-Top ball. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this invention, it should be noted that if terms such as "inner" or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "configure," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Example

[0033] This embodiment provides a method for detecting and adjusting the height of a spherical screw. A height detection fixture is used to detect and adjust the height of the spherical screw. Specifically, the height detection fixture includes a laser tracker and a detection sleeve 1. Please refer to... Figure 2 and 3The laser tracker is existing technology, and readily available finished products commonly used by those skilled in the art can be used. Furthermore, the laser tracker's built-in software allows for the setting of the measurement coordinate system and origin as needed. The target ball 2 is also an existing finished product, used in conjunction with the laser tracker. The detection sleeve 1 has a central blind hole 11 with a tapered cross-section at its bottom. During use, a spherical screw 3 can be inserted into the central blind hole 11, so that the small ball 31 at the top of the spherical screw 3 directly reaches the bottom of the central blind hole 11. The bottom of the central blind hole 11 is stably engaged with the small ball 31 at the top through the tapered structure. Moreover, the central blind hole 11 and the spherical screw 3 have a clearance fit, preventing the detection sleeve 1 from freely wobbling during detection, thus ensuring detection accuracy. The outer end face of the closed end of the detection sleeve 1 has a ball-placement groove 12 for placing the target ball 2. The cross-section of the ball-placement groove 12 is tapered, ensuring the target ball 2 can be stably placed.

[0034] Please refer to Figure 1 This embodiment provides a method for detecting and adjusting the height of a spherical screw, which includes:

[0035] S1. Construct a measurement space coordinate system 1 using a laser tracker;

[0036] S2. Arbitrarily select a spherical screw as the first spherical screw. In the spatial coordinate system 1, use a laser tracker to measure the coordinates of the center of the top ball 31 of the first spherical screw 3, and obtain the height value H of the center of the top ball 31.

[0037] S3. Install the detection sleeve 1 on the top of the first spherical screw 3, place the target ball 2 on the ball placement groove 12 of the detection sleeve 1, measure the center coordinates of the target ball 2, and obtain the height value L of the center of the target ball;

[0038] S4. Calculate the distance D between the center of the target ball 2 and the center of the top ball 31 of the first spherical screw 3, that is, the height L of the target ball center minus the height H of the top ball center, D = LH. Move the spatial coordinate system 1 up by a distance D along the Z-axis to form the spatial coordinate system 2.

[0039] S5. In spatial coordinate system 2, the coordinates of the center of the target ball 2 are re-measured using a laser tracker to obtain the height value of the center of the target ball 2. If the height value of the center of the target ball does not meet the design requirements, the first spherical screw is adjusted until the design requirements are met. At this time, in spatial coordinate system 2, the Z-axis coordinate of the target ball 2 is equal to the height of the spherical screw 3. Finally, the Z-axis coordinate of the target ball 2 is compared with the design height value of the spherical screw 3, and the height of the spherical screw 3 is adjusted as needed. When the Z-axis coordinate of the target ball 2 is the same as the design height value of the spherical screw 3, it indicates that the height of the first spherical screw 3 has been adjusted to the design height.

[0040] S6. Install the testing sleeve onto each of the other spherical screws one by one, and adjust and measure according to step S5. After the height of the first spherical screw 3 is adjusted to the correct position, the testing sleeve 1 can be directly installed on all subsequent spherical screws 3, such as the second and third spherical screws. In the spatial coordinate system 2, the height of the spherical screw 3 is determined by the Z-axis coordinate of the target ball 2. There is no need to perform multi-point measurements on each spherical screw 3, nor is it necessary to measure the center of the top ball 31 on each spherical screw 3. This facilitates quick adjustment by the operator. This testing fixture has good stability, improves work efficiency, and solves the problem of low efficiency in testing the height of the spherical screw 3.

[0041] Please refer to Figure 4 Using this testing fixture, the spherical screw 3 with specifications of M10×150 and a ball head diameter of φ9.5mm was measured on the heliostat assembly platform. The specific implementation steps are as follows:

[0042] Step 1: Use a laser tracker to measure and construct the required spatial coordinate system 1 according to the heliostat assembly platform and technical requirements;

[0043] Step 2: Randomly select a spherical screw 3 as the first spherical screw 3, and use a laser tracker to measure the small ball 31 at the top of the first spherical screw 3 to obtain the coordinates of the ball center. The height of the ball center 31 at the top of the screw from the reference plane is H.

[0044] Step 3: Fit the testing sleeve 1 of the testing fixture onto the spherical screw 3 measured in Step 2, place the target ball 2 in the upper conical surface of the testing fixture, use a laser tracker to measure the target ball 2, obtain the coordinates of the center of the target ball 2, and calculate the height L of the center of the target ball 2 in coordinate system 1.

[0045] Step 4: Calculate the distance D = LH between the center of the target ball 2 and the center of the spherical screw 3. When adjusting the height of different spherical screws 3, since the detection fixture remains constant, the value of D remains constant. Therefore, coordinate system 1 is moved upward by a distance D along the Z-axis to form coordinate system 2. At this time, in coordinate system 2, the Z-axis coordinate value of the center of the target ball 2 is the height distance from the center of the ball 31 at the top of the spherical screw 3 to the reference plane, which is the height parameter of the spherical screw 3 to be adjusted.

[0046] Step 5: Use the "adjustment" function of the laser tracker to guide the adjustment of the spherical screw 3 to the design height value, and re-measure the center coordinates of the target ball 2 of the laser tracker. If the design requirements are not met, continue to adjust until the design requirements are met.

[0047] Step 6: Install the testing fixture onto the other spherical screws 3, adjust and measure according to Step 5, directly measure the real-time coordinates of the target ball 2 in coordinate system 2, adjust the height of the current spherical screw 3 according to the height value of the target ball 2 until the height value of the target ball 2 meets the design requirements, indicating that the height of the current spherical screw 3 meets the design requirements.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for detecting and adjusting the height of a spherical screw, characterized in that, Height detection is performed using a height detection fixture, which includes a laser tracker and a detection sleeve. The detection sleeve has a central blind hole into which a spherical screw can be inserted. The outer end face of the closed end of the detection sleeve has a ball-placement groove for placing a target ball. The method for detecting the height of a spherical screw includes the following steps: S1. Construct a measurement space coordinate system 1 using a laser tracker; S2. Arbitrarily select a spherical screw as the first spherical screw. In the spatial coordinate system 1, measure the coordinates of the center of the top ball of the first spherical screw and obtain the height value H of the center of the top ball. S3. Fit the detection sleeve onto the first spherical screw, place the target ball in the ball placement groove of the detection sleeve, measure the coordinates of the center of the target ball in the spatial coordinate system 1, and obtain the height value L of the center of the target ball; S4. Calculate the distance D between the center of the target ball and the center of the small ball at the top of the first spherical screw. Move the spatial coordinate system 1 up by a distance D along the Z-axis to form the spatial coordinate system 2. S5. In spatial coordinate system 2, use a laser tracker to re-measure the coordinates of the target ball's center and obtain the height value of the target ball's center. If the height value of the target ball's center does not meet the design requirements, adjust the first spherical screw until the design requirements are met. S6. Install the test sleeves onto the other spherical screws one by one, and adjust and measure according to step S5.

2. The method for detecting and adjusting the height of a spherical screw according to claim 1, characterized in that, The distance D between the center of the target ball and the center of the top ball of the first spherical screw is calculated as follows: the height L of the target ball's center minus the height H of the top ball's center is the distance D.

3. The method for detecting and adjusting the height of a spherical screw according to claim 1, characterized in that, The cross-section at the bottom of the central blind hole is tapered.

4. The method for detecting and adjusting the height of a spherical screw according to claim 1, characterized in that, The central blind hole is clearance-fitted with the spherical screw.

5. The method for detecting and adjusting the height of a spherical screw according to claim 1, characterized in that, The cross-section of the ball-placement groove is conical.

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