Measurement and Detection Method and Detection Equipment for the Surface Shape Accuracy of Parabolic Trough Reflectors

Abstract

Method and device for measuring and detecting the surface accuracy of a trough-shaped parabolic reflector, belonging to the field of solar reflector accuracy detection, solving the problems in the prior art that the detection depends on the general assembly workshop and thus cannot be carried out at the final application site, and that the existing optical detection equipment is expensive, complex and has high requirements for the workshop. The method and device of the present invention use the light rays emitted by a light source to simulate the light rays emitted from the focus of the parabolic reflector to be detected, and irradiate the parabolic reflector to be detected; according to the light ray deviation reflected by the "parabolic reflector to be detected", the shape and position accuracy of the "parabolic reflector to be detected" are measured and detected. The method and device of the invention no longer depend on the general assembly workshop, can detect the final surface accuracy of the parabolic reflector after regular operation and detection at the application site, and greatly reduce the cost. The detection and measurement results are simple, intuitive, and the detection results and calibration targets can be formed on the spot, solving the problems in the prior art.

Description

Technical Field

[0001] The present invention relates to a metrology and detection method and detection equipment for complex surface profiles, belonging to the field of precision detection of solar reflectors. Background Art

[0002] The trough solar thermal power generation system uses a trough-shaped parabolic mirror to concentrate heat for power generation, and mainly consists of a trough-shaped parabolic mirror, a heat collection tube, and a tracking mechanism. Among them, the mirror is generally made of glass, with silver plating on the back and a protective layer, or a mirror aluminum plate or a mirror stainless steel plate can also be used to make the mirror. The trough-shaped parabolic mirror can focus the incident sunlight on a line at the focus, and a heat collection tube with a receiver is installed on this line to absorb sunlight and heat the internal heat transfer medium.

[0003] In the entire trough solar thermal power generation system, the parabolic profile accuracy of the mirror is very important, which can determine the reflection effect of sunlight. When the parabolic profile accuracy of the mirror is low, after the sunlight is reflected by the mirror, it cannot be effectively focused on the heat collection tube at the focus of the trough-shaped parabolic mirror, reducing the total effective area of the reflecting surface and directly leading to a decrease in the thermal efficiency of the entire power generation system. Therefore, both the ex-factory inspection of the parabolic mirror and the surface profile accuracy inspection of the parabolic mirror at the optical thermal power generation site are extremely important.

[0004] The existing technology for surface profile accuracy inspection of parabolic mirrors is: installing optical detection equipment inside the roof of the general assembly workshop, setting the assembled parabolic mirror below the optical detection equipment, and using the optical detection equipment to receive the reflection of the mirror on the light, and then measuring and detecting the surface profile accuracy of the parabolic mirror.

[0005] In the existing patent, the patent application number is 201210004029.8, and the invention name is a rapid performance evaluation device and method for a solar accumulation reflector surface, which discloses a gantry frame, a cross beam, and a light target support. Linear guide rails are installed on both sides of the gantry frame. The two ends of the cross beam are slidably matched with the two linear guide rails, and the cross beam is driven to move vertically up and down on the gantry frame by a driving motor and a transmission mechanism. A plurality of small laser emission tubes are installed in parallel at equal intervals on the cross beam to simulate the situation where parallel sunlight irradiates and converges on the mirror surface. A light target support is installed in the middle of the cross beam, and a light target and a CCD camera are installed on the support. The CCD camera is used to obtain the image of the mirror surface irradiating on the light target and convert it into a digital video signal, and the performance of the mirror is evaluated by image processing and analysis by a PC.

[0006] However, the existing technologies have the following problems: 1. For the detection of the surface accuracy of the parabolic mirror, it is necessary to conduct the detection in the general assembly workshop, and it is impossible to conduct the final installation state detection at the application site of the parabolic mirror. Nor can it be detected and calibrated for the surface accuracy of the parabolic mirror at the site after running for a period of time or after regular maintenance. Moreover, the common size of the opening of the parabolic mirror is 5 to 12 meters in length, and the length dimension range of the parabolic mirror is generally 8 to 18 meters. Such a length is not convenient for storage and transportation, and the measurement is difficult; 2. The existing technologies have high requirements for the workshop, and the optical detection equipment and post-processing equipment are expensive and complex; 3. In the detection technology disclosed in the patent application No. 201210004029.8, with the invention name of a device and method for rapid performance evaluation of a solar concentrating reflector surface, the relative position between the entire gantry frame and the parabolic mirror to be detected cannot be effectively determined. As a result, the light target needs to be adjusted every time during detection to set the light target at the focus of the parabolic mirror. Therefore, the detection process is cumbersome; in addition, due to structural limitations, this device cannot be effectively applied to the on-site detection of parabolic mirrors; moreover, this device uses a light target to collect the images reflected by multiple laser emitters through reflectors. Although it can detect the overall performance of the parabolic mirror, since the CCD camera can only collect the images on the light target and cannot collect the light reflection path, it is not known which specific laser emitter's reflected image position has an error, so it is not clear which specific position of the parabolic mirror has a surface defect, and it cannot play a guiding role in the production process of the parabolic mirror (for example: whether a defect in a certain mold position or process causes a surface defect at this point).

[0007] Therefore, there is an urgent need to propose a new method and equipment for measuring and detecting the surface accuracy of a trough-shaped parabolic mirror to solve the above technical problems. Summary of the Invention

[0008] The object of the present invention is to solve the problems that the surface accuracy of the existing trough-shaped parabolic mirror can only be detected in the workshop, and it is impossible to detect and measure the surface accuracy of the parabolic mirror after final installation, operation, and maintenance at the application site, as well as the problems that the optical detection equipment for detection in the existing workshop is expensive, complex, and has high requirements for the workshop. A method and equipment for measuring and detecting the surface accuracy of a trough-shaped parabolic mirror are invented. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0009] The technical solution of the present invention:

[0010] A method for measuring and detecting the surface accuracy of a trough-shaped parabolic mirror includes the following steps:

[0011] Step S1. Simulate the light rays emitted from the focus of the parabolic mirror to be detected by the light rays emitted from a light source, and project them onto the parabolic mirror to be detected.

[0012] Step S2. Measure and detect the shape and position accuracy of the "parabolic mirror to be detected" according to the deviation of the light rays reflected by the "parabolic mirror to be detected".

[0013] Preferably: There are at least two light sources. The light rays emitted by the light sources intersect at an intersection point and then project onto the parabolic mirror to be detected, or the reverse extension lines of the light rays emitted by the light sources intersect at an intersection point.

[0014] Preferably: The positional relationship between the light source and the parabolic mirror to be detected is that the plane formed by the light source and its light rays is in the same plane as the profile line of the cross-section of the "parabolic mirror to be detected", and the intersection point of all the light rays coincides with the focus position of the parabolic mirror to be detected.

[0015] Preferably: In Step S2, the specific method for measuring and detecting the shape and position accuracy of the "parabolic mirror to be detected" is to calibrate and check the parallelism of the parallel light rays reflected by the light source through the parabolic mirror to be detected and / or the position error of the light spot formed by the projection of the parallel light rays, so as to measure the position and angular deviation of the parabolic mirror to be detected.

[0016] A detection device for the surface shape accuracy of a trough-shaped parabolic mirror, comprising at least two light sources for emitting light rays and a scale. The positions of the light sources and the scale are relatively fixed. The light rays emitted by the light sources project onto the parabolic mirror to be detected, are reflected, and irradiate onto the scale to form light spots.

[0017] Preferably: The scale is provided with a dial, and the dial is provided with scale lines of two-dimensional coordinates. The "number and position of the dials" correspond one-to-one with the "number and position of the light spots formed by the parallel light rays projecting onto the scale".

[0018] Preferably: The scale is of a foldable, telescopic and / or detachable structure.

[0019] Preferably: The scale adopts a dial with a light-sensitive surface, and the dial converts the position of the light spot irradiated on the surface into an electrical signal.

[0020] Preferably: A slider is installed on the detection device, and a slide rail is provided on the heat collecting tube support of the parabolic mirror to be detected as a support structure. The slider on the detection device is used in cooperation with the slide rail provided on the heat collecting tube support.

[0021] Preferably: The slider is adjustably installed on the scale through a first adjustment bolt.

[0022] Preferably, two parallel light source brackets are installed on the lower end face of the scale. Slide block adjusting seats are respectively installed on the inner sides of the light source brackets. The slide blocks are installed on the slide block adjusting seats through first adjusting bolts.

[0023] Preferably, two parallel light source brackets are installed on the lower end face of the scale. A second adjusting bolt is also installed on the light source bracket, and the second adjusting bolt abuts against the slide rail.

[0024] Preferably, light source installation holes are formed in the light source brackets, and the light sources are installed in the light source installation holes.

[0025] Preferably, a first marking portion is provided at the center of the lower end face of the scale.

[0026] Preferably, a first marking portion is provided at the center of the lower end face of the scale. A positioning support is installed at the lower end of the slide rail, and a second marking portion corresponding to the first marking portion is installed at the center of the positioning support.

[0027] Preferably, the end of the first marking portion is arc-shaped. When used for detection, the first marking portion fits against the outer wall of the heat collecting tube.

[0028] Preferably, both the first marking portion and the second marking portion are triangular, or the first marking portion is triangular and the second marking portion is an M shape corresponding to the triangle.

[0029] The present invention has the following beneficial effects:

[0030] The method and device for measuring and detecting the surface shape accuracy of the trough-shaped parabolic reflector mirror of the present invention simulate setting a light source at the focus of the parabolic reflector mirror, and detect the surface shape accuracy of the parabolic reflector mirror through the parallel light error of the light rays reflected from the light source to the surface of the parabolic reflector mirror. This method and device do not depend on the general assembly workshop, can detect and measure the accuracy of the parabolic reflector mirror in the final application state at the application site of the collector, as well as the regular detection after running for a period of time. Compared with the prior art, the cost is greatly reduced, the detection result is simple and intuitive, and the detection result and the calibration target are formed on the spot, solving the problems of high cost, complexity and inability to detect the surface shape accuracy of the parabolic reflector mirror in the final running state in the prior art. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the parabolic reflector mirror concentrating solar heat in Embodiment 1;

[0032] Figure 2 It is a schematic diagram of the overall structure of the trough-shaped collector in Embodiment 1;

[0033] Figure 3-1 It is a schematic diagram of the method for detecting parallel light rays at the focus of the trough-shaped parabolic reflector in Embodiments 1 and 2 Figure 1 ;

[0034] Figure 3-2 Schematic diagram of the detection method for parallel light rays at the reflection focus of the trough-shaped parabolic mirror in Embodiment 1 and Embodiment 2 Figure 2 ;

[0035] Figure 4-1 Structural plan view of the device for detecting the surface shape accuracy of the trough-shaped parabolic mirror;

[0036] Figure 4-2 Schematic diagram of the structure of the device for detecting the surface shape accuracy of the trough-shaped parabolic mirror Figure 2 ;

[0037] Figure 5 Schematic diagram of the layout structure of the dial on the scale;

[0038] Figure 6 Schematic diagram of the detection deviation of the parabolic mirror in the x-axis direction in Embodiment 1;

[0039] Figure 7 Schematic diagram of the detection deviation of the parabolic mirror in the z-axis direction in Embodiment 1;

[0040] Figure 8 Schematic diagram of the detection deviation of the parabolic mirror in both the x- and z-axis directions simultaneously in Embodiment 1;

[0041] Figure 9 Schematic diagram of the installation structure of the slide rail on the heat collector support in Embodiment 5;

[0042] Figure 10 Alignment installation diagram of the detection device and the slide rail in Embodiment 6;

[0043] Figure 10-1 Schematic diagram of the installation of the scale on the heat collector support in Embodiment 9;

[0044] Figure 11 Installation structure and positional relationship diagram of the second identification part, positioning support and slide rail in Embodiment 10;

[0045] Figure 12 Schematic diagram of the structure of the combined detection device in Embodiment 11;

[0046] In the figure: 1 - parabolic mirror, 2 - mirror support, 3 - heat collector, 4 - heat collector support, 5 - light source, 6 - parallel light rays, 7 - scale, 8 - slider, 9 - slide rail, 10 - first adjustment bolt, 11 - second adjustment bolt, 12 - positioning bolt, 13-1 - first identification part, 13-2 - second identification part, 14 - light source support, 15 - installation positioning hole, 17 - first detection device, 18 - second detection device, 19 - slider adjustment seat, 20 - intersection point, 21 - positioning support, 71 - dial, 711 - scale line, 712 - origin of the dial. Specific Embodiment

[0047] To make the objectives, technical solutions and advantages of the present invention clearer and more explicit, the present invention will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0048] The present invention is a method and device for measuring and detecting the surface accuracy of a trough parabolic mirror, which solves the problems that the prior art depends on the general assembly workshop for detecting the surface accuracy of the parabolic mirror and cannot detect at the final application site, and that the existing optical detection equipment is expensive, complex and has high requirements for the workshop.

[0049] The method and device of the present invention use a light source 5 to simulate the focus of the parabolic mirror 1, and detect and measure the parabolic accuracy of the parabolic mirror through the light rays projected onto the parabolic mirror surface 1 and the parallel light error of the reflected light.

[0050] The method and device of the present invention no longer depend on the general assembly workshop, can detect the final surface accuracy of the parabolic mirror 1 at the final application site or after regular operation, and can greatly reduce costs. The detection and measurement results are simple, intuitive, and the detection results and calibration targets can be formed on the spot, solving the problems of the prior art.

[0051] Embodiment 1

[0052] First, for the convenience of description, the illustrations of the present invention are all carried out in a three-dimensional rectangular coordinate system of x, y, and z.

[0053] This embodiment is a method for measuring and detecting the surface accuracy of a trough parabolic mirror. As Figure 1 shown, the trough collector is used to collect the parallel light irradiated by the sun, and the parallel light is concentrated and focused onto the heat collecting pipe 3 at the focal line of the parabolic mirror 1 through the parabolic mirror 1, achieving the effect of concentrating the solar energy.

[0054] As Figure 2 shown, the trough collector includes a parabolic mirror 1, a mirror support 2, a heat collecting pipe 3, and a heat collecting pipe support 4. The parabolic mirror 1 is installed on the mirror support 2, the heat collecting pipe 3 is installed on the heat collecting pipe support 4, and the heat collecting pipe 3 is at the focus of the parabolic mirror 1.

[0055] For such a trough collector, the method for measuring and detecting the surface accuracy of the trough parabolic mirror in this embodiment, as Figure 3-1 , Figure 3-2 shown, specifically includes the following steps:

[0056] Step S1. Use the light rays emitted by the light source 5 to simulate the light rays emitted from the focus of the parabolic mirror 1 to be detected, and project them onto the parabolic mirror 1 to be detected.

[0057] Step S2. According to the deviation of the light rays reflected by the "parabolic mirror 1 to be detected", measure and detect the shape and position accuracy of the "parabolic mirror 1 to be detected".

[0058] In this embodiment, use the light source 5 to simulate the light rays emitted from the focus of the parabolic mirror 1 to be detected, project them onto the parabolic mirror 1 to be detected, and reflect parallel light rays 6 parallel to the y-axis. Then, according to the parallelism error of the parallel light rays 6 or / and the position error of the parallel light spot, measure the profile accuracy of the parabolic mirror 1.

[0059] Among them, the light rays emitted by the light source 5 are high-brightness light rays that do not scatter. After the light rays are reflected by the parabolic mirror 1 to be detected, they irradiate on the scale 7 to produce a light spot, and the diameter of the light rays or the light spot is less than 2 mm.

[0060] Among them, there are at least 2 light sources 5. As Figure 3-1 shown, the light rays emitted by the light source 5 intersect at the intersection point 20 and then project onto the parabolic mirror 1 to be detected; or as Figure 3-2 shown, the reverse extension lines of the light rays emitted by the light source 5 intersect at the intersection point 20.

[0061] Furthermore, the positional relationship between the light source 5 and the parabolic mirror 1 to be detected is that "the plane formed by the light source 5 and its light rays" and "the profile of the cross-section of the parabolic mirror 1 to be detected" are in the same plane, and the intersection point 20 of all the light rays coincides with the focus position of the parabolic mirror 1 to be detected. In this way, the light source 5 can simulate the light rays emitted from the focus of the parabolic mirror 1 to be detected, and the light rays emitted by the light source 5 can be reflected after passing through the "cross-section of the parabolic mirror 1 to be detected". Since the light source 5, the light rays, and the cross-section of the detection parabolic mirror 1 are all in the same spatial plane, by judging the parallelism of the parallel light rays 6 or the difference between the position of the light spot formed by the projection of the parallel light rays 6 and the standard position, the surface profile accuracy detection of the trough-shaped parabolic mirror can be completed.

[0062] Furthermore, in step S2, the specific method for measuring and detecting the shape and position accuracy of the "parabolic mirror 1 to be detected" is: by calibrating and checking the "parallelism of the parallel light rays 6 reflected by the light source 5 through the parabolic mirror 1 to be detected" or / and the "position error of the light spot formed by the projection of the parallel light rays 6", so as to measure the position and angular deviation of the parabolic mirror surface 1 to be detected.

[0063] In this embodiment, the method for measuring and detecting the surface profile accuracy of the trough-shaped parabolic mirror is as follows:

[0064] As shown Figure 6 in the figure, the light ray emitted from the light source 5 (point) hits the B point position of the parabolic reflecting mirror surface 1 to be detected. If the coordinates of point B are ( ),, the coordinate value and tangent angle of point B satisfy the parabolic equation of the reflecting mirror surface: , for the standard parabolic reflecting mirror surface 1 to be detected, the parallel light ray 6 reflected from point B is parallel to the y-axis, and for any point on the reflected parallel light ray 6 , if the scale 7 of the detection device is at , and the scale 7 is parallel to the x-axis, then the coordinate of the standard light spot position where the parallel light ray 6 reflected by the light source 5 through point B hits the scale 7 is .

[0065] If there are position and / or profile tangent angle deviations of point B of the parabolic reflecting mirror surface 1 to be detected in the xy plane, then the reflection reaches Figure 6 the point shown in , the coordinate of , then there is a deviation of in the x-axis direction between the light source ray light spot and the standard position A, which means that there is a deviation of point B in the xy plane. By correspondingly adjusting the xy-direction angle of point B in the parabolic reflecting mirror surface 1 to be detected, can be reduced to within the specified error requirement range.

[0066] As Figure 7 shown in the figure, if the light spot position where the parallel light ray 6 is refracted through point B to the scale height y2 plane is , and there is a position deviation in the z-axis direction from the standard position , then it means that there is a deviation of point B in the yz plane. By correspondingly adjusting the yz-direction angle of the reflecting mirror at point B, can be reduced to within the specified error requirement range.

[0067] As Figure 8 shown in the figure, if the light ray of the light source ray refracted through point B of the reflecting mirror surface to the scale , has deviations in both the x-axis and z-axis directions from the standard position A, it indicates that there are deviations of point B of the reflecting mirror surface in both the xy plane and the yz plane. The deviation in the x-axis direction is , and the deviation in the z-axis direction is . According to the deviation values , the surface shape accuracy of point B of the reflecting mirror surface can be calibrated, and by adjusting the angle of point B in the xy and yz planes, can be reduced to within the specified error requirement range.

[0068] Further, by detecting three mirror surface points of a parabolic mirror 1 and obtaining the deviation from the standard spot coordinates, the position and angular deviation of each detection point can be calculated and measured, and the deviation adjustment amounts for adjusting the xy, yz angles or / and the height position of the entire mirror can be obtained.

[0069] Embodiment 2

[0070] Based on the detection method of Embodiment 1, Embodiment 2 provides a metrology detection device for the surface shape accuracy of a trough-type parabolic mirror, as Figure 3-1 、 Figure 3-2 、 Figure 4-1 、 Figure 4-2 and Figure 5 shown. The detection device includes at least two light sources 5 for emitting light rays and a scale 7. The positions of the light sources 5 and the scale 7 are relatively fixed. The light rays emitted by the light sources 5 are incident on the parabolic mirror 1 to be detected, reflected, and then irradiate on the scale 7 to form a spot;

[0071] Among them, the scale 7 is provided with a dial 71, and the dial 71 is provided with scale lines 711 of two-dimensional coordinates. The "number and position of the dials 71" correspond one-to-one with the "number and position of the spots formed by the parallel light rays 6 irradiating on the scale 7". The origin 712 of each dial on the scale 7 is located at the standard position of the "parallel spot reflected by the light source rays through the standard parabolic mirror 1".

[0072] The specific method for performing metrology detection of the surface shape accuracy of the parabolic mirror using the detection device of this embodiment is as follows: Install the scale 7 directly above the parabolic mirror 1 to be detected, and make the light rays emitted by the light source 5 intersect at the intersection point 20 and then be incident on the parabolic mirror 1 to be detected; or the reverse extension lines of the light rays emitted by the light source 5 intersect at the intersection point 20. Use the light rays emitted by the light source 5 to irradiate on the parabolic mirror 1 to be detected to form a reflection, and finally project the spot onto the dial 71 of the scale 7. By using the metrology detection method for the surface shape accuracy of the trough-type parabolic mirror in Embodiment 1, the shape and position accuracy of the "parabolic mirror 1 to be detected" can be realized for metrology detection.

[0073] In the above metrology calculation method, the scale 7 arranged along the x-axis corresponds to the standard position of each parallel spot reflected by the parallel light rays 6 through the standard parabolic mirror 1, which is the origin of each dial 71, that is, Figure 5 the point A shown in Figure 6 、 7 、8. The plane of the dial 71 is perpendicular to the y-axis, and scale lines 711 parallel to the x-axis and z-axis are set with the origin as the center. The deviation value between the deviation spot and the standard spot is detected and identified, that is, the deviation value from the origin A.

[0074] Embodiment 3

[0075] The difference between this Embodiment 3 and Embodiment 2 lies in that, for the convenience of collecting the spot position data of the parallel light rays 6 reflected by the parabolic mirror 1 onto the scale 7, the dial 71 of the scale 7 adopts a photosensitive recognition surface, and the spot position data during detection is converted into an electrical signal in real time and transmitted to a computer for real-time data acquisition, storage, and calculation.

[0076] Embodiment 4

[0077] The difference between this embodiment and the aforementioned Embodiment 2 and Embodiment 3 lies in that both sides of the scale 7 are of a foldable, telescopic or / and detachable structure. Since the common size of the opening of the parabolic mirror 1 is 5 - 12 meters and the length of the collector is approximately 8 - 18 meters, the length of the scale 7 for measurement should be equivalent to the opening size of the parabolic mirror. Therefore, the length of the scale 7 also needs to be made 5 - 12 meters. However, a scale 7 of this length is not convenient for storage and transportation, so the scale 7 is designed to be foldable or / and detachable.

[0078] Embodiment 5

[0079] As Figure 4-1 and Figure 4-2 shown, a slider 8 is installed on the detection device, and a slide rail 9 is provided on the heat collector support 4 of the parabolic mirror 1 to be detected as a support structure. The slider 8 on the detection device is used in cooperation with the slide rail 9 provided on the heat collector support 4.

[0080] In this Embodiment 5, as Figure 4-2 shown: The slider 8 is directly adjustably installed on the scale 7 through a first adjustment bolt 10; as Figure 9 shown: The slide rail 9 can be fixedly installed on the heat collector support 4 through a positioning bolt 12. Specifically, on the heat collector support 4 of the parabolic trough mirror 1 to be detected, a positioning bolt 12 is installed at the installation positioning hole 15 for installing the heat collector 3, and the slide rail 9 is fixed through the positioning bolt 12. With such a setting, when using the detection device to perform metrological detection on the parabolic mirror 1 to be detected, the scale 7 is installed on the slide rail 9 through the slider 8, and the first adjustment bolt 10 is adjusted. By adjusting the first adjustment bolt 10, the installation position of the slider 8 relative to the slide rail 9 is further adjusted, so that the "intersection point 20 of the light rays emitted by the light source 5" or the "intersection point 20 of the reverse extension lines of the light rays emitted by the light source 5" on the detection device is at the focus of the parabolic mirror 1 to be detected (or the intersection point 20 coincides with the focus of the parabolic mirror 1 to be detected). At this time, the result of the parabolic mirror surface shape accuracy metrological detection by the method of Embodiment 1 or Embodiment 2 is more accurate and reliable.

[0081] Embodiment 6

[0082] The difference between this Embodiment 6 and Embodiment 5 lies in the installation form of the slider 8 on the scale 7. As Figure 10 shown, two parallel light source brackets 14 are installed on the lower end face of the scale 7. Slider adjusting seats 19 are respectively installed on the inner sides of the light source brackets 14. The slider 8 is installed on the slider adjusting seat 19 through the first adjusting bolt 10. By adjusting the first adjusting bolt 10, it is still possible to adjust the intersection point 20 of the light sources 5 to coincide with the focus of the parabolic mirror 1 to be detected, and finally complete the measurement and detection of the surface shape accuracy of the parabolic mirror surface.

[0083] Embodiment 7

[0084] The detection device for the surface shape accuracy of the trough parabolic mirror in this Embodiment 7, as Figure 4-2 、 Figure 10 and Figure 10-1 shown, two parallel light source brackets 14 are installed on the lower end face of the scale 7. A second adjusting bolt 11 is also installed on the light source bracket 14, and the second adjusting bolt 11 abuts against the slide rail 9. With such a setting, by adjusting the second adjusting bolt 11, the position of the scale 7 in the z-axis direction meets the detection installation standard, avoiding errors in the measurement data of the surface shape accuracy of the parabolic mirror due to the installation error of the scale 7.

[0085] Embodiment 8

[0086] The detection device for the surface shape accuracy of the trough parabolic mirror in this Embodiment 8, as Figure 4-1 、 Figure 4-2 and Figure 10 shown, the light source 5 is arranged on the light source bracket 14. A plurality of light source mounting holes are provided on the light source bracket 14, and a plurality of light sources 5 are installed in the light source mounting holes. The light rays emitted by the light sources 5 are reflected after irradiating the parabolic mirror 1 to be detected, and finally project the light spots onto the scale plate 71 of the scale 7. Also, because the number of scale plates 71 on the scale 7 corresponds one-to-one with the number of light sources 5, at this time, by calibrating, identifying, and proofreading the imaging states on each scale plate 71, the surface shape accuracy of the parabolic mirror 1 to be detected can be achieved. Through the surface shape accuracy, problems such as installation errors and surface defects of the parabolic mirror 1 to be detected can be accurately analyzed. In addition, since the scale plate 71 and the light source 5 in this embodiment are in one-to-one correspondence, the detection results on the scale plate 71 can be used to inversely deduce which specific light source 5 has a surface shape defect when irradiating the surface of the parabolic mirror 1 to be detected through the results data, thereby guiding the production or installation of the parabolic mirror through the result data.

[0087] Embodiment 9

[0088] The detection device for the surface shape accuracy of the trough parabolic mirror in this Embodiment 9, as Figure 10-1As shown, a first identification portion 13-1 is provided at the center of the lower end face of the scale 7. The end of the first identification portion 13-1 is arc-shaped. When used for detection, the first identification portion 13-1 is attached to the outer wall of the heat collecting tube 3. With such a setting, when performing the final installation state detection or regular maintenance after the photoelectric heating site has been operating for a period of time, at this time, the heat collecting tube 3 has been installed on the heat collecting tube support 4. When performing the detection, the scale 7 is installed above the parabolic mirror 1 to be detected, and the light source support 14 is erected on both sides of the heat collecting tube support 4. The first adjustment bolt 10 is adjusted so that the sliders 8 on both sides are attached to the slide rails 9, and at the same time, it is ensured that (1) the scale 7 is parallel to the x-axis; (2) the end of the first identification portion 13-1 is attached to the outer wall of the heat collecting tube 3; the second adjustment bolt 11 is adjusted so that the position of the scale 7 in the z-axis direction meets the detection installation standard. At this time, the intersection point 20 of the light sources 5 on the light source support 14 is at the focus of the parabolic mirror 1 to be detected. By using the method of Embodiment 1 or Embodiment 2, the shape and position accuracy of the "parabolic mirror 1 to be detected" can be measured and detected.

[0089] By using the first identification portion 13-1 of this embodiment, the standard installation of the scale 7 during the detection process can be quickly and accurately completed without disassembling the heat collecting tube 3. While saving manpower and material resources, the cost of disassembling the heat collecting tube 3 required for on-site maintenance is greatly reduced, and the detection result is intuitive, and the detection result and calibration target can be formed on the spot.

[0090] Embodiment 10

[0091] The detection device for the surface shape accuracy of the trough-shaped parabolic mirror in this Embodiment 10, such as Figure 4-2 、 Figure 10 、 Figure 11As shown, a first identification part 13-1 is arranged at the center of the lower end surface of the scale 7. A positioning support 21 is installed at the lower end of the slide rail 9, and a second identification part 13-2 corresponding to the first identification part 13-1 is installed at the center of the positioning support 21. Both the first identification part 13-1 and the second identification part 13-2 are triangular, or the first identification part 13-1 is triangular and the second identification part 13-2 is an M shape corresponding to the triangle. With such a setting, when the trough solar collector leaves the factory or during the on-site installation process of the trough solar collector, at this time the collector tube 3 has not been installed on the collector tube support 4. During the detection, the scale 7 is installed above the parabolic mirror 1 to be detected, and the light source support 14 is erected on both sides of the collector tube support 4. The first adjustment bolt 10 is adjusted to make the sliders 8 on both sides fit with the slide rail 9, and at the same time ensure that (1) the scale 7 is parallel to the x-axis; (2) the end of the first identification part 13-1 fits with the second identification part 13-2; the second adjustment bolt 11 is adjusted to make the position of the scale 7 in the z-axis direction meet the detection installation standard. At this time, the intersection point 20 of the light sources 5 on the light source support 14 is at the focus of the parabolic mirror 1 to be detected. The shape and position accuracy of the "parabolic mirror 1 to be detected" can be measured and detected by the method of Embodiment 1 or Embodiment 2.

[0092] As Figure 10 , the detection device is installed on the temporarily installed slide rail 9 on the collector tube support 4 of the parabolic mirror 1. If the first identification part 13-1 at the light ray intersection point 20 coincides with the second identification part 13-2, it means that the light ray is the light emitted from the focus of the parabolic mirror 1.

[0093] If the first identification part 13-1 and the second identification part 13-2 do not coincide, then by adjusting the first adjustment bolt 10, the position of the detection device in the y-axis direction and the angle in the xy plane are adjusted to make the two identification structures coincide in the xy and yz planes. Further, by adjusting the second adjustment bolt 11, the position of the detection device in the x-axis direction and the angle in the xz plane are adjusted to make the two identification structures coincide in the xz plane, so as to realize the complete centering and coincidence of the two identification structures in the xy, xz, and yz planes, that is, the installation centering of the detection device is completed, and then the detection of the parabolic mirror 1 to be detected can be started.

[0094] Embodiment 11

[0095] The difference between this embodiment and the foregoing embodiments is that, in order to improve the detection efficiency, 2 groups or more of "detection devices" can be integrated into an integrated detection device with an integrated connection, specifically as Figure 12As shown, the first detection device 17 and the second detection device 18 are connected in parallel through a connection structure, and can simultaneously detect the surface accuracy of two cross-sections of the parabolic mirror 1, improving the detection efficiency, further improving the detection accuracy, eliminating the system measurement error, and decoupling the position deviation and surface height deviation of the mirror surface.

[0096] Embodiment 12

[0097] In this embodiment, the light source (5) is a visible light source, an invisible light source or ultrasonic waves. The visible light source is purple light, blue light, green light, yellow light, orange light or red light, and the invisible light source is an infrared light source, an ultraviolet light source, an X-ray or a gamma ray.

[0098] Among them, visible light sources and invisible light sources are distinguished according to the wavelength range of light. The wavelength of light determines whether the human eye can see the light, so light sources are divided into visible and invisible categories.

[0099] The first category, visible light sources, refers to light sources that emit light that can be perceived by the human eye. The wavelength range of visible light is approximately 380 to 700 nanometers, and different wavelengths correspond to different colors: (1) Purple light: wavelength about 380 - 450 nm; (2) Blue light: wavelength about 450 - 495 nm; (3) Green light: wavelength about 495 - 570 nm; (4) Yellow light: wavelength about 570 - 590 nm; (5) Orange light: wavelength about 590 - 620 nm; (6) Red light: wavelength about 620 - 700 nm. And some lasers can also emit visible light of specific wavelengths (such as red, green, and blue lasers).

[0100] The second category, invisible light sources, are lights that the human eye cannot directly see, and the wavelength of the light is not within the visible light range. According to different wavelengths, invisible light can be divided into the following categories: (1) Infrared light sources: wavelength greater than 700 nm, infrared light can be detected by some electronic devices, but the human eye cannot see it; (2) Ultraviolet light sources; (3) X-rays.

[0101] In this embodiment, using the above light source and combining with specific Embodiment 1 can achieve the metrological detection of the surface accuracy of the trough-shaped parabolic mirror.

[0102] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined. Those skilled in the art can exhaust all possibilities according to the mathematical knowledge of permutation and combination. Therefore, the present invention will no longer describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by the present invention.

[0103] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A metrological detection method for the surface shape accuracy of a trough-shaped parabolic reflector, characterized in that, It includes the following steps: Step S1. Use the light rays emitted by the light source (5) to simulate the light rays emitted from the focus of the parabolic mirror (1) to be detected, and project them onto the parabolic mirror (1) to be detected; Step S2. According to the light ray deviation reflected by the "parabolic mirror (1) to be detected", measure and detect the shape and position accuracy of the "parabolic mirror (1) to be detected".

2. The metrological detection method for the surface shape accuracy of a trough-shaped parabolic reflector according to claim 1, characterized in that: There are at least two light sources (5). The light rays emitted by the light sources (5) intersect at the intersection point (20) and then project onto the parabolic mirror (1) to be detected, or the reverse extension lines of the light rays emitted by the light sources (5) intersect at the intersection point (20).

3. The metrological detection method for the surface shape accuracy of the trough-shaped parabolic reflector according to claim 2, characterized in that: The positional relationship between the light source (5) and the parabolic mirror (1) to be detected is that the plane formed by the "light source (5) and its light rays" and the "profile line of the cross-section of the parabolic mirror (1) to be detected" are in the same plane, and the intersection point (20) of all light rays coincides with the focal position of the parabolic mirror (1) to be detected.

4. The metrological detection method for the surface shape accuracy of a trough-shaped parabolic reflector according to claim 1, characterized in that: In Step S2, the specific method for measuring and detecting the shape and position accuracy of the "parabolic mirror (1) to be detected" is: by calibrating and adjusting the "parallelism of the parallel light rays (6) reflected by the light source (5) through the parabolic mirror (1) to be detected" and / or the "position error of the light spot formed by the projection of the parallel light rays (6)", so as to measure the position and angular deviation of the parabolic mirror (1) to be detected.

5. A detecting device for the surface accuracy of a trough-shaped parabolic reflector used in the method for measuring and detecting the surface accuracy of a trough-shaped parabolic reflector according to any one of claims 1 to 4, characterized in that: It includes at least two light sources (5) for emitting light rays and a scale (7). The positions of the light sources (5) and the scale (7) are relatively fixed. The light rays emitted by the light sources (5) project onto the parabolic mirror (1) to be detected, are reflected, and irradiate onto the scale (7) to form light spots.

6. The detection device for the surface shape accuracy of a trough-shaped parabolic reflector according to claim 5, characterized in that: The scale (7) is provided with a dial (71), and the dial (71) is provided with scale lines (711) of two-dimensional coordinates. The "number and position of the dials (71)" correspond one-to-one with the "number and position of the light spots formed when the parallel light rays (6) project onto the scale (7)".

7. The detecting device for the surface shape accuracy of the trough-shaped parabolic reflector according to claim 5, characterized in that: The scale (7) is of a foldable, telescopic or / and detachable structure.

8. The detection device for the surface shape accuracy of the trough-shaped parabolic reflector according to claim 5, wherein: The scale (7) adopts a dial (71) with a light-sensitive surface, and the dial (71) converts the position of the light spot irradiated on the surface into an electrical signal.

9. The detecting device for the surface accuracy of a trough-shaped parabolic reflector according to claim 6 or 7 or 8, characterized in that: A slider (8) is installed on the detection device. A slide rail (9) is provided on the heat collecting tube support (4) of the parabolic mirror (1) to be detected as a support structure, and the slider (8) on the detection device is used in cooperation with the slide rail (9) provided on the heat collecting tube support (4).

10. The detection device for the surface shape accuracy of the trough-shaped parabolic reflector according to claim 9, characterized in that: The slider (8) is adjustably installed on the scale (7) through a first adjustment bolt (10).

11. The detection device for the surface shape accuracy of a trough-shaped parabolic reflector according to claim 9, characterized in that: Two parallel light source brackets (14) are installed on the lower end surface of the scale (7). Slide block adjusting seats (19) are respectively installed on the inner sides of the light source brackets (14), and the slider (8) is installed on the slide block adjusting seat (19) through a first adjustment bolt (10).

12. The detection device for the surface shape accuracy of a trough-shaped parabolic reflector according to claim 9, characterized in that: Two parallel light source brackets (14) are installed on the lower end surface of the scale (7). A second adjustment bolt (11) is also installed on the light source brackets (14), and the second adjustment bolt (11) abuts against the slide rail (9).

13. The detection device for the surface shape accuracy of a trough-shaped parabolic reflector according to claim 12, characterized in that: The light source (5) is installed on the light source bracket (14).

14. The detection device for the surface shape accuracy of a trough-shaped parabolic reflector according to claim 12, characterized in that: The light source bracket (14) is provided with a light source mounting hole, and the light source (5) is mounted in the light source mounting hole.

15. The detection device for the surface shape accuracy of the trough-shaped parabolic reflector according to claim 9, characterized in that: A first marking portion (13-1) is provided at the center of the lower end surface of the scale (7).

16. The detection device for the surface shape accuracy of a trough-shaped parabolic reflector according to claim 9, characterized in that: A first marking portion (13-1) is provided at the center of the lower end surface of the scale (7), a positioning support (21) is mounted at the lower end of the slide rail (9), and a second marking portion (13-2) corresponding to the first marking portion (13-1) is mounted at the center of the positioning support (21).

17. The detection device for the surface shape accuracy of the trough-shaped parabolic reflector according to claim 15, characterized in that: The end of the first marking portion (13-1) is arc-shaped. When used for detection, the first marking portion (13-1) is attached to the outer wall of the heat collecting tube (3).

18. The detection device for the surface shape accuracy of a trough-shaped parabolic reflector according to claim 16, characterized in that: Both the first marking portion (13-1) and the second marking portion (13-2) are triangular, or the first marking portion (13-1) is triangular and the second marking portion (13-2) is an M shape corresponding to the triangle.

19. The detecting device for the surface shape accuracy of a trough-shaped parabolic reflector according to claim 5, characterized in that: The light source (5) is a visible light source, an invisible light source or ultrasonic waves. The visible light source is purple light, blue light, green light, yellow light, orange light, red light or visible light emitted by a laser. The invisible light source is an infrared light source, an ultraviolet light source or an X-ray.

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