Method for detecting and adjusting height of spherical screw

Abstract

The invention discloses a method for detecting and adjusting the height of a spherical screw, height detection is performed by using a height detection tool, and the method for detecting the height of the spherical screw comprises the following steps: S1, constructing a measurement space coordinate system 1 by using a laser tracker; s2, randomly selecting one spherical screw rod as a first spherical screw rod, and measuring a sphere center coordinate of a small sphere at the top end of the first spherical screw rod in the space coordinate system 1; s3, the first spherical screw is sleeved with a detection sleeve, a target ball is placed in a ball containing groove of the detection sleeve, and in the space coordinate system 1, the center coordinates of the target ball are measured; and S4, forming a space coordinate system 2. By using the detection tool, only the first spherical screw needs to be subjected to multi-point measurement, then the heights of other spherical screws are directly adjusted according to the coordinates of the target sphere, multi-point measurement does not need to be carried out one by one, time consumption is low, operation is convenient, stability is good, working efficiency is improved, and the problem that the efficiency of detecting the heights of the spherical screws is low is solved.

Description

Technical Field

[0001] The invention belongs to the field of detection technology, and in particular relates to a method for detecting and adjusting the height of a spherical screw. Background Art

[0002] One of the important components on the spherical screw heliostat assembly platform, the spherical screw heliostat assembly platform refers to the Chinese invention patent with publication number CN113399220A and patent name "A method for gluing large heliostats" previously applied by the applicant. Heliostats are generally composed of multiple sub-mirrors spliced ​​on the assembly platform into a large mirror with a certain curvature, so as to focus solar radiation onto the tower heat absorber. A large number of spherical screws with the same specifications and one end being spherical are installed on the heliostat assembly platform. The spherical part is in contact with the mirror. Through precise detection and adjustment of the height of the spherical screws, these spherical screws form the curvature required by the design. The sub-mirrors are placed on these spherical screws for splicing to obtain the heliostats required by the design.

[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 plane. The reference plane is a virtual plane in space, not a real plane. In addition, the size of the assembly platform is large and cannot be measured with conventional measuring tools. A laser tracker is required to carry out relevant measurements and use its "adjustment" function to guide the height adjustment of the spherical screw. After the height is adjusted in place, the spherical screw needs to be remeasured to check whether it meets the design height requirements.

[0004] Since the laser tracker needs to measure four points on the surface of the small ball at the top of the screw to obtain the coordinates of the center of the small ball at the top of the screw, and completing the height adjustment of a spherical screw requires at least two inspections, that is, to complete the height adjustment of a spherical screw, a total of at least eight points of the small ball at the top of the screw need to be measured. Since there are a large number of spherical screws that need to be adjusted, if eight points need to be measured for each spherical screw to complete the inspection tooling, it will take a long time, which increases the labor intensity of the inspectors and reduces work efficiency. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a method for detecting and adjusting the height of a spherical screw. By using a detection tool, only multi-point measurement of the first spherical screw is required. After that, the heights of other spherical screws are directly adjusted according to the target ball coordinates. There is no need to perform multi-point measurements one by one. This method is time-saving, easy to operate, and has good stability. It improves work efficiency and solves the problem of low efficiency in detecting the height of spherical screws.

[0006] The embodiments of the present invention are implemented by the following technical solutions:

[0007] A method for detecting and adjusting the height of a spherical screw rod, using a height detection tool to perform height detection, the height detection tool comprising a laser tracker and a detection sleeve, the detection sleeve is provided with a central blind hole, the spherical screw rod can be inserted into the central blind hole, and the outer end surface of the closed end of the detection sleeve is provided with a ball placement groove for placing a target ball;

[0008] The method for detecting the height of the ball screw comprises the following steps:

[0009] S1. Use laser tracker to construct measurement space coordinate system 1;

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

[0011] S3. Put the detection sleeve onto the first spherical screw, place the target ball in the ball-setting 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, and move the spatial coordinate system 1 up along the Z axis by a distance D to form a spatial coordinate system 2;

[0013] S5. In the spatial coordinate system 2, the coordinates of the center of the target ball are remeasured using a laser tracker to obtain the height value of the center of the target ball. If the height value of the center of the target ball does not meet the design requirement, the first spherical screw is adjusted until the design requirement is met;

[0014] S6. Put the detection sleeves onto other ball 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 small ball of the first spherical screw is calculated by subtracting the height value H of the center of the top small ball from the height value L of the center 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 conical.

[0017] In one embodiment of the present invention, the central blind hole and the spherical screw are clearance-matched.

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

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

[0020] The present invention utilizes a height detection tool. First, on the first spherical screw, the Z-axis coordinate of the target ball, that is, the height value of the target ball, is linked with the height value of the spherical screw. Then, the height of the first spherical screw is adjusted, that is, the Z-axis coordinate of the target ball is adjusted, until the Z-axis coordinate of the target ball meets the design requirements, that is, the height of the first spherical screw meets the design requirements. Thereafter, for other spherical screws, the height detection tool is directly installed on the spherical screw. It is only necessary to adjust the Z-axis coordinate of the target ball to the design value. Compared with the prior art, only the first spherical screw needs to perform multi-point measurement to obtain the center of the top ball. After the Z-axis coordinate of the target ball is linked with the height value of the spherical screw, thereafter, other spherical screws no longer need to perform multi-point measurement, nor do they need to measure the sphericity of the top ball. It is only necessary to adjust the Z-axis coordinate of the target ball to the design value, which is convenient for operators to quickly adjust. The method for detecting the height of the spherical screw of the present application has good stability, improves work efficiency, and solves the problem of low efficiency in detecting the height of the spherical screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a flow chart of the method for detecting the height of the ball screw in the present invention;

[0023] Figure 2 It is a schematic diagram of a tooling for detecting the height of a ball screw in the present invention;

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

[0025] Figure 4 It is a schematic diagram of establishing a coordinate system when the height tooling in the present invention is used.

[0026] Icon: 1-detection sleeve, 11-center blind hole, 12-ball groove, 2-target ball, 3-spherical screw, 31-top small ball. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that if the terms "inside" or "outside" appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "configure", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Example

[0033] This embodiment provides a method for detecting and adjusting the height of a ball screw, using a height detection tool to detect and adjust the height of the ball screw. Specifically, the height detection tool includes a laser tracker and a detection sleeve 1. Please refer to Figure 2 and 3The laser tracker is an existing technology, and the finished product commonly used by technicians in this field can be used. The built-in software of the laser tracker can set the measurement coordinate system and the measurement coordinate origin as needed. The target ball 2 is also an existing finished product and is used in conjunction with the laser tracker. The detection sleeve 1 is provided with a central blind hole 11, and the cross-section of the bottom end of the central blind hole 11 is conical. When in use, the spherical screw 3 can be inserted into the central blind hole 11, so that the top ball 31 of the spherical screw 3 directly reaches the bottom end of the central blind hole 11. The bottom end of the central blind hole 11 is stably matched with the top ball 31 through the conical structure. Moreover, the central blind hole 11 and the spherical screw 3 are clearance-matched. During detection, the detection sleeve 1 will not shake freely to ensure detection accuracy. The outer end surface of the closed end of the detection sleeve 1 is provided with a ball placement groove 12 for placing the target ball 2. The cross-section of the ball placement groove 12 is conical to ensure that 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 ball screw, which includes:

[0035] S1. Use laser tracker to construct measurement space coordinate system 1;

[0036] S2. arbitrarily select a spherical screw as the first spherical screw, and measure the coordinates of the center of the top ball 31 of the first spherical screw 3 in the spatial coordinate system 1 using a laser tracker, 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 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 center of the target ball minus the height H of the center of the top ball, D = LH, and move the spatial coordinate system 1 up along the Z axis by a distance D to form a spatial coordinate system 2;

[0039] S5. In the spatial coordinate system 2, the coordinates of the center of the target sphere 2 are remeasured using a laser tracker to obtain the height value of the center of the target sphere 2. If the height value of the center of the target sphere does not meet the design requirement, the first spherical screw is adjusted until the design requirement is met. At this time, in the spatial coordinate system 2, the Z-axis coordinate of the target sphere 2 is equivalent to the height of the spherical screw 3. Finally, the Z-axis coordinate of the target sphere 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 sphere 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 detection sleeves on 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 right position, the second spherical screw, the third spherical screw, and all other spherical screws 3 can be directly installed with the detection sleeve 1. 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, and there is no need to measure the center of the top small ball 31 of each spherical screw 3, which is convenient for operators to adjust quickly. This detection tooling has good stability, improves work efficiency, and solves the problem of low efficiency in detecting the height of the spherical screw 3.

[0041] Please refer to Figure 4 , use this inspection tool to measure the ball screw 3 with a specification of M10×150 and a ball head diameter of φ9.5mm 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: arbitrarily select a spherical screw 3 as the first spherical screw 3, use a laser tracker to measure the top ball 31 of the first spherical screw 3, and obtain the coordinates of the center of the ball, wherein the height from the center of the top ball 31 of the screw to the reference plane is H;

[0044] Step 3: Put the detection sleeve 1 of the detection tooling onto the spherical screw 3 measured in step 2, place the target ball 2 on the upper conical surface of the detection tooling, 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 the 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 D value remains constant, so the coordinate system 1 is moved up along the Z axis by a distance D to form a coordinate system 2. At this time, in the 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 small ball 31 at the top of the spherical screw 3 to the reference plane, that 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 ball screw 3 to adjust to the designed height value, re-measure the coordinates of the center of the target ball 2 of the laser tracker, and continue to adjust if it does not meet the design requirements until it meets the design requirements;

[0047] Step 6: Attach the inspection tooling set to other spherical screws 3, adjust and measure according to step 5, directly measure the real-time coordinates of the target ball 2 in the coordinate system 2, and 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 only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for detecting and adjusting the height of a ball screw, characterized in that: The height detection is performed by using a height detection tool, the height detection tool comprising a laser tracker and a detection sleeve, the detection sleeve is provided with a central blind hole, the spherical screw can be inserted into the central blind hole, and the outer end surface of the closed end of the detection sleeve is provided with a ball placement groove for placing a target ball; The method for detecting the height of the ball screw comprises the following steps: S1. Use laser tracker to construct measurement space coordinate system 1; S2. arbitrarily select a spherical screw as the first spherical screw, measure the coordinates of the center of the top ball of the first spherical screw in the spatial coordinate system 1, and obtain the height value H of the center of the top ball; S3. Put the detection sleeve onto the first spherical screw, place the target ball in the ball-setting 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, and move the spatial coordinate system 1 up along the Z axis by a distance D to form a spatial coordinate system 2; S5. In the spatial coordinate system 2, the coordinates of the center of the target ball are remeasured using a laser tracker to obtain the height value of the center of the target ball. If the height value of the center of the target ball does not meet the design requirement, the first spherical screw is adjusted until the design requirement is met; S6. Put the detection sleeves onto other ball screws one by one, and adjust and measure according to step S5.

2. A method for detecting and adjusting the height of a ball screw according to claim 1, characterized in that: The distance value D between the center of the target ball and the center of the small ball at the top of the first spherical screw is calculated by subtracting the height value H of the center of the small ball at the top from the height value L of the center of the target ball.

3. A method for detecting and adjusting the height of a ball screw according to claim 1, characterized in that: The cross section of the bottom end of the central blind hole is conical.

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

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

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