Metrological measurement method and measurement device for surface figure accuracy of parabolic trough reflector

Abstract

A metrological measurement method and measurement device for the surface figure accuracy of a parabolic trough reflector. The method comprises: using light rays (6) emitted from a light source (5) to simulate light rays emitted from the focal point of a parabolic reflector (1) to be subjected to measurement, and transmitting the light rays onto said parabolic reflector (1); and on the basis of deviations of the light rays (6) reflected by said parabolic reflector (1), performing metrological measurement on the shape and position accuracy of said parabolic reflector (1). The present invention no longer relies on a final assembly plant, and can measure the final surface figure accuracy of a parabolic reflector (1) at an application site, thereby greatly reducing costs, and generating a measurement result and a calibration object on site.

Description

Method and device for measuring and detecting parabolic trough reflector surface precision TECHNICAL FIELD

[0001] The present application relates to a kind of complex surface profile measurement and detection method and detection equipment, belong to solar reflector precision detection field. BACKGROUND

[0002] The trough type solar thermal power generation system is used to focus heat to generate electricity by using parabolic trough reflector, which mainly consists of parabolic trough reflector, heat collector tube and tracking mechanism. The reflector is usually made of glass, with silver coating on the back and protective layer. It can also be made of mirror aluminum plate or mirror stainless steel plate. The parabolic trough reflector can focus the incident sunlight to a line of focal points, and the heat collector tube with receiver is installed on the line to absorb sunlight and heat the internal heat transfer medium.

[0003] In the whole trough type solar thermal power generation system, the precision of parabolic trough reflector surface is very important, which can determine the reflection effect of sunlight. When the precision of parabolic trough reflector surface is low, the reflected sunlight cannot be effectively focused on the heat collector tube at the focal point of parabolic trough reflector, which reduces the total effective area of the reflecting surface and directly leads to the decrease of the thermal efficiency of the whole power generation system. Therefore, it is extremely important to detect the precision of parabolic trough reflector surface both in factory detection and on-site detection of photothermal power generation.

[0004] The existing detection technology for the precision of parabolic trough reflector surface is to install optical detection equipment on the roof of the assembly plant, set the assembled parabolic trough reflector below the optical detection equipment, and use the optical detection equipment to receive the reflection of light by the reflector, and then measure and detect the precision of parabolic trough reflector surface.

[0005] In the existing patent with patent number 201210004029.8 and invention name of a solar accumulation reflector surface rapid performance evaluation device and method, a gantry frame, a cross beam and a light target support are disclosed. Linear guides are installed on both sides of the gantry frame. The ends of the cross beam are slidingly connected with the linear guides, and the cross beam is driven to move vertically on the gantry frame by a driving motor and a transmission mechanism. A plurality of small laser emitting tubes are installed on the cross beam in parallel at equal intervals to simulate the situation of parallel sunlight shining on the reflector 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 reflector surface shining on the light target, and convert it into digital video signal. The performance of the reflector is evaluated by PC image processing and analysis.

[0006] But the prior art has the following problems: 1. The detection of the surface type precision of the parabolic reflector must be detected in the assembly plant, and it is impossible to detect the surface type precision of the parabolic reflector after final installation at the application site of the parabolic reflector, and it is also impossible to detect the surface type precision of the parabolic reflector after a period of operation or regular maintenance at the application site, and the length of the opening of the parabolic reflector is commonly 5 to 12 meters, and the length of the parabolic reflector is generally 8 to 18 meters, which is inconvenient for storage and transportation and difficult to measure; 2. The existing technology requires a high plant, and the optical detection equipment and post-processing equipment are expensive and complex; 3. The detection technology disclosed in the patent No. 201210004029.8 and the invention name of a solar energy accumulation reflector surface rapid performance evaluation device and method cannot effectively determine the relative position of the entire gantry frame and the parabolic reflector to be detected, so that the light target needs to be adjusted every time the detection is performed, and the light target is arranged at the focal point of the parabolic reflector, so that the detection process is complicated; in addition, due to the structural limitation, the device cannot be effectively applied to the operation site detection of the parabolic reflector; in addition, the device uses a light target to collect the imaging of a plurality of laser emission tubes reflected by the reflector, although the overall performance of the parabolic reflector can be detected, since the CCD camera can only collect the imaging on the light target, the light reflection path cannot be collected, so it is not clear which specific position of the parabolic reflector has the imaging position error, so that it cannot guide the production process of the parabolic reflector (for example: whether a mold position or process defect causes the point surface type to have a defect).

[0007] Therefore, it is urgent to propose a new type of groove type parabolic reflector surface type precision measurement and detection method and detection equipment to solve the above technical problems. Technical problem

[0008] The purpose of the present application is to solve the problems that the surface type precision of the existing groove type parabolic reflector can only be detected in the plant, and the surface type precision of the parabolic reflector cannot be detected after final installation at the application site and after operation and maintenance, and the problem that the optical detection equipment for detection in the plant is expensive and complex, and the plant requires high technology, and the invention of a groove type parabolic reflector surface type precision measurement and detection method and equipment. In the following, a brief summary of the present application is given to provide a basic understanding of some aspects of the present application. It should be understood that this summary is not an exhaustive summary of the present application. It is not intended to determine the key or important parts of the present application, nor to limit the scope of the present application. Technical solution

[0009] The technical scheme of the present application is:

[0010] The application discloses a method for measuring and detecting groove type parabolic reflector surface type precision, which comprises the following steps:

[0011] Step S1. Simulate the light rays emitted by the light source to the parabolic reflector to be detected.

[0012] Step S2. Measure and detect the shape and position precision of the parabolic reflector to be detected according to the deviation of the reflected light rays.

[0013] Preferably, the light source is at least two, and the light rays emitted by the light source intersect at an intersection point and then are incident on the parabolic reflector to be detected, or the reverse extension lines of the light rays emitted by the light source intersect at an intersection point.

[0014] Preferably, the position relationship between the light source and the parabolic reflector to be detected is that the plane formed by the light source and the light rays is in the same plane as the profile of the cross section of the parabolic reflector to be detected, and the intersection point of all the light rays coincides with the focal point of the parabolic reflector to be detected.

[0015] Preferably, in step S2, the specific method for measuring and detecting the shape and position precision of the parabolic reflector to be detected is that the parallelism of the light rays reflected by the light source through the parabolic reflector to be detected or / and the position error of the light spot formed by the projection of the light rays is calibrated and compared, so that the position and angle deviation of the parabolic reflector to be detected are measured.

[0016] A detection device for measuring and detecting groove type parabolic reflector surface type precision comprises at least two light sources for emitting light rays and a scale, the light sources and the scale are fixed in position, the light rays emitted by the light sources are incident on the parabolic reflector to be detected, are reflected, and form light spots on the scale.

[0017] Preferably, the scale is provided with a scale disc, the scale disc is provided with scale lines of two-dimensional coordinates, and the number and position of the scale discs correspond to the number and position of the light spots formed on the scale by the light rays.

[0018] Preferably, the scale has a foldable, telescopic or / and detachable structure.

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

[0020] Preferably, the detection device is provided with a sliding block, a slide rail is arranged on a heat collecting pipe support of the parabolic reflector to be detected as a support structure, and the sliding block on the detection device is used in cooperation with the slide rail arranged on the heat collecting pipe support.

[0021] Preferably, the sliding block is adjustably mounted on the scale through a first adjusting bolt.

[0022] Preferably, two light source supports are arranged in parallel on the lower end surface of the scale, and a sliding block adjusting seat is arranged on the inner side of each light source support.

[0023] Preferably, a second adjusting bolt is arranged on the light source support, and the second adjusting bolt abuts against the sliding rail.

[0024] Preferably, a light source mounting hole is arranged on the light source support, and a light source is arranged in the light source mounting hole.

[0025] Preferably, a first identification part is arranged at the center of the lower end surface of the scale.

[0026] Preferably, a first identification part is arranged at the center of the lower end surface of the scale, and a positioning support is arranged at the lower end of the sliding rail, and a second identification part corresponding to the first identification part is arranged at the center of the positioning support.

[0027] Preferably, the end of the first identification part is arc-shaped, and the first identification part is attached to the outer wall of the heat collecting pipe during detection.

[0028] Preferably, the first identification part and the second identification part are both triangular, or the first identification part is triangular and the second identification part is M-shaped corresponding to the triangular shape. Beneficial effects

[0029] The method and the device for measuring and detecting the surface type precision of the trough type parabolic reflector simulate the setting of a light source at the focal point of the parabolic reflector, detect the surface type precision of the parabolic reflector through the parallel light error of the light reflected by the light source to the parabolic reflector surface. The method and the device do not depend on the assembly plant, can detect the precision of the final application state of the parabolic reflector in the application field of the heat collector, and can detect periodically after running for a period of time. Compared with the prior art, the cost is greatly reduced, the detection result is simple and intuitive, the detection result and the adjustment target are formed on the spot, and the problems of high cost, complexity and inability to detect the surface type precision of the parabolic reflector in the final running state in the prior art are solved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 is a schematic diagram of light collection and heat collection of the parabolic reflector in embodiment 1;

[0031] Fig. 2 is a schematic diagram of the overall structure of the trough type heat collector in embodiment 1;

[0032] Fig. 3-1 is a schematic diagram of the light ray detection method of the focal point of the trough type parabolic reflector in embodiment 1 and embodiment 2;

[0033] Fig. 3-2 is a schematic diagram of the method for detecting the focal point of the light rays reflected by the trough-shaped parabolic reflector in Example 1 and Example 2;

[0034] Fig. 4-1 is a plan view of the structure of the device for detecting the accuracy of the surface profile of the trough-shaped parabolic reflector;

[0035] Fig. 4-2 is a schematic diagram of the structure of the device for detecting the accuracy of the surface profile of the trough-shaped parabolic reflector;

[0036] Fig. 5 is a schematic diagram of the arrangement of the scale on the ruler;

[0037] Fig. 6 is a schematic diagram of the detection of the deviation of the parabolic reflector in the x-axis direction in Example 1;

[0038] Fig. 7 is a schematic diagram of the detection of the deviation of the parabolic reflector in the z-axis direction in Example 1;

[0039] Fig. 8 is a schematic diagram of the detection of the simultaneous deviations of the parabolic reflector in the x-axis and z-axis directions in Example 1;

[0040] Fig. 9 is a schematic diagram of the installation of the slide rail on the support of the heat collecting tube in Example 5;

[0041] Fig. 10 is a diagram of the centering installation of the detection device and the slide rail in Example 6;

[0042] Fig. 10-1 is a schematic diagram of the installation of the ruler on the support of the heat collecting tube in Example 9;

[0043] Fig. 11 is a diagram of the installation structure and positional relationship of the second identification part, the positioning support and the slide rail in Example 10;

[0044] Fig. 12 is a schematic diagram of the structure of the combined detection device in Example 11;

[0045] In the drawings: 1 - parabolic reflector, 2 - reflector support, 3 - heat collecting tube, 4 - support of the heat collecting tube, 5 - light source, 6 - light rays, 7 - ruler, 8 - slide block, 9 - slide rail, 10 - first adjusting bolt, 11 - second adjusting bolt, 12 - positioning bolt, 13-1 first identification part, 13-2 second identification part, 14 - support of the light source, 15 - installation positioning hole, 17 - first detection device, 18 - second detection device, 19 - slide block adjusting seat, 20 - intersection point, 21 - positioning support, 71 - scale, 711 - scale line, 712 - origin of the scale. Embodiments of the present application

[0046] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described below through specific examples shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0047] The application is a kind of groove type parabolic reflector surface type precision measurement detection method and detection equipment, solves the problem that the prior art depends on the assembly plant to detect the parabolic reflector surface type precision, and cannot detect in the final application site, and the problem that the existing optical detection equipment is expensive and complex and requires high plant.

[0048] The method and equipment of the application simulate the focal point of the parabolic reflector 1 by using the light source 5, detect the parabolic precision of the parabolic reflector by the error of the light rays and the reflected parallel light rays.

[0049] The method and equipment of the application no longer depend on the assembly plant, can detect the final surface type precision of the parabolic reflector 1 in the final application site or after regular operation, greatly reduce the cost, and the detection result is simple and intuitive, and the detection result and the adjustment target can be formed on the spot, solving the problem of the prior art.

[0050] Embodiment 1

[0051] First, for the convenience of description, the drawings of the application are all in the x, y, z three-dimensional rectangular coordinate system.

[0052] The embodiment is a kind of groove type parabolic reflector surface type precision measurement detection method. As shown in Figure 1, the groove type collector is used to collect parallel light of solar radiation, and the parallel light is collected and focused on the collector tube 3 at the focal line of the parabolic reflector 1 by the parabolic reflector 1, to achieve the effect of collecting solar energy.

[0053] As shown in Figure 2, the groove type collector includes a parabolic reflector 1, a reflector support 2, a collector tube 3 and a collector tube support 4, the parabolic reflector 1 is installed on the reflector support 2, the collector tube 3 is installed on the collector tube support 4, and the collector tube 3 is at the focal point of the parabolic reflector 1.

[0054] For this kind of groove type collector, the groove type parabolic reflector surface type precision measurement detection method in the embodiment, as shown in Figure 3-1 and Figure 3-2, specifically includes the following steps:

[0055] Step S1. Simulate the light rays emitted from the focal point of the parabolic reflector 1 to be detected by the light rays emitted from the light source 5, and shoot on the parabolic reflector 1 to be detected;

[0056] Step S2. According to the deviation of the light rays reflected by the parabolic reflector 1 to be detected, measure and detect the shape and position precision of the parabolic reflector 1 to be detected.

[0057] In this embodiment, the light source 5 is used to simulate the light emitted from the focal point of the parabolic mirror 1 to be detected, and the light is reflected by the parabolic mirror 1 to be detected to form a light ray 6 parallel to the y-axis. The parallelism error of the light ray 6 or / and the position error of the parallel light spot is used to measure the profile accuracy of the parabolic mirror 1.

[0058] In this embodiment, the light source 5 is used to simulate the light emitted from the focal point of the parabolic mirror 1 to be detected, and the light is reflected by the parabolic mirror 1 to be detected to form a light ray 6 parallel to the y-axis. The parallelism error of the light ray 6 or / and the position error of the parallel light spot is used to measure the profile accuracy of the parabolic mirror 1.

[0059] In this embodiment, the light source 5 is used to simulate the light emitted from the focal point of the parabolic mirror 1 to be detected, and the light is reflected by the parabolic mirror 1 to be detected to form a light ray 6 parallel to the y-axis. The parallelism error of the light ray 6 or / and the position error of the parallel light spot is used to measure the profile accuracy of the parabolic mirror 1.

[0060] Further, the position 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 the light ray 6 is in the same plane as the profile of the cross section of the parabolic mirror 1 to be detected, and the intersection point 20 of all the light rays 6 coincides with the focal point of the parabolic mirror 1 to be detected. In this way, the light source 5 can simulate the light emitted from the focal point of the parabolic mirror 1 to be detected, and the parallel light ray 6 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 ray 6, and the cross section of the parabolic mirror 1 to be detected are all in the same spatial plane, the profile accuracy of the parabolic mirror 1 to be detected can be measured by judging the parallelism of the light ray 6 or the difference between the position of the light spot formed by the projection of the light ray 6 and the standard position.

[0061] Further, in step S2, the specific method for measuring the shape and position accuracy of the parabolic mirror 1 to be detected is to calibrate and correct the parallelism of the light ray 6 reflected by the parabolic mirror 1 to be detected or / and the position error of the light spot formed by the projection of the light ray 6, so as to measure the position and angle deviation of the parabolic mirror 1 to be detected.

[0062] In this embodiment, the method for measuring the profile accuracy of the parabolic mirror 1 to be detected is as follows:

[0063] As shown in FIG. 6, the light ray 6 emitted by the light source 5 (point 01) is incident on the B point of the parabolic mirror 1 to be detected. If the coordinates of the B point are (x1, y1, z0), the coordinate values and the tangent angle of the B point satisfy the parabolic mirror equation: x2=2py. For the standard parabolic mirror 1 to be detected, the light ray 6 reflected by the B point is parallel to the y-axis, and the x=x1 and z=z0 of any point on the reflected light ray 6. 0 If the scale 7 of the detection device is at y=y2, and the scale 7 is parallel to the x axis, the light ray 6 reflected by the light source 5 through the point B is shot to the standard light spot position coordinate A (x1, y2, z0) of the scale 7.

[0064] If the point B of the parabolic mirror surface 1 to be detected has a position deviation or / and a tangent angle deviation in the xy plane, the reflected light ray is shot to the point (x2, y2, z0) shown in Fig. 6, then the deviation of the light ray spot of the light source from the standard position A in the x axis direction means that the point B has a deviation in the xy plane, and the xy direction angle of the point B of the parabolic mirror surface 1 to be detected is adjusted accordingly to reduce the △x to the range of the specified error requirement.

[0065] As shown in Fig. 7, if the light spot position of the light ray 6 reflected by the point B to the scale height y2 plane is (x2, y2, z2), and there is a position deviation of the light spot from the standard position A (x1, y2, z0) in the z axis direction, it means that the point B has a deviation in the yz plane, and the yz direction angle of the point B of the parabolic mirror surface is adjusted accordingly to reduce the △z to the range of the specified error requirement.

[0066] As shown in Fig. 8, if the light ray of the light source is reflected by the point B of the mirror surface to the scale (x2, y2, z2), and there is a deviation of the light ray from the standard position A in the x axis and z axis directions, it means that the point B of the mirror surface has deviations in the xy plane and the yz plane, the x axis direction deviation is △x, and the z axis direction deviation is △z. According to the deviation values △x and △z, the surface type precision of the point B of the mirror surface is calibrated, and the angles of the point B in the xy plane and the yz plane are adjusted to reduce the △x and the △z to the range of the specified error requirement.

[0067] Further, by detecting three mirror surface points of a parabolic mirror 1, the deviations of the three mirror surface points from the standard light spot coordinates are obtained, the position and angle deviations of each detection point are calculated, and the deviation adjustment amount of the xy and yz angles or / and the height position of the whole mirror is obtained.

[0068] Embodiment 2

[0069] The embodiment 2 provides a kind of groove parabolic mirror surface type precision metrology detection device according to the detection method of embodiment 1, as shown in Fig. 3-1, Fig. 3-2, Fig. 4-1, Fig. 4-2 and Fig. 5, detection device includes at least two for emitting light ray 6 light source 5 and scale 7, the position of the light source 5 and scale 7 is opposite fixed, the light ray 6 shot by light source 5 is shot on the parabolic mirror 1 to be detected, and reflection is formed light spot on scale 7;

[0070] Wherein, the ruler 7 is provided with a scale disc 71, the scale disc 71 is provided with scale lines 711 of two-dimensional coordinates, the number and position of the scale disc 71 correspond to the number and position of the light spots formed by the light rays 6 on the ruler 7, and the origin 712 of each scale disc on the ruler 7 is located at the standard position of the parallel light spot reflected by the light rays through the standard parabolic mirror 1.

[0071] The specific method of measuring the parabolic mirror surface shape precision by using the detection device of the embodiment is as follows: the ruler 7 is installed directly above the parabolic mirror 1 to be detected, and the light source 5 emits the light rays 6 to intersect at the intersection point 20 and then to the parabolic mirror 1 to be detected; or the reverse extension line of the light rays 6 emitted by the light source 5 intersects at the intersection point 20, the light rays 6 emitted by the light source 5 are used to irradiate the parabolic mirror 1 to be detected to form a reflection, and finally the light spot is projected on the scale disc 71 of the ruler 7, and the measuring method of the parabolic mirror surface shape precision of the embodiment 1 is used to realize the measurement of the shape and position precision of the parabolic mirror 1 to be detected.

[0072] In the above measurement method, the ruler 7 arranged along the x-axis direction corresponds to the standard position of the parallel light spot reflected by each light ray 6 through the standard parabolic mirror 1, that is, the origin of each scale disc 71, that is, point A shown in FIG. 5, the disc surface of the scale disc 71 is perpendicular to the y-axis, and the scale lines 711 parallel to the x-axis and the z-axis are arranged with the origin as the center, and the deviation value of the deviation light spot from the standard light spot is detected and identified, that is, the deviation values of and from the origin A as shown in FIGS. 6, 7 and 8.

[0073] Embodiment 3

[0074] The difference between the embodiment 3 and the embodiment 2 is that, in order to facilitate the collection of the light spot position data of the light rays 6 reflected by the parabolic mirror 1 to the ruler 7, the scale disc 71 of the ruler 7 adopts a photosensitive recognition surface, and the light spot position data during detection is converted into an electrical signal in real time and transmitted to a computer for real-time data collection, storage and calculation.

[0075] Embodiment 4

[0076] The difference between the embodiment and the aforementioned embodiments 2 and 3 is that the two sides of the ruler 7 are foldable, telescopic or / and detachable structures. Since the common size of the opening of the parabolic mirror 1 is 5-12 meters, and the length of the collector is about 8-18 meters, the length of the measuring ruler 7 should be comparable to the opening size of the parabolic mirror, so the length of the ruler 7 also needs to be made to be 5-12 meters, but such a length of the ruler 7 is not convenient for storage and transportation, so the ruler 7 is designed to be foldable or / and detachable.

[0077] Embodiment 5

[0078] As shown in FIG. 4-1 and FIG. 4-2, the detection device is provided with a sliding block 8, and a sliding rail 9 is arranged on the heat collecting tube support 4 of the parabolic reflector 1 to be detected as a support structure, and the sliding block 8 on the detection device is used in cooperation with the sliding rail 9 arranged on the heat collecting tube support 4.

[0079] In this embodiment 5, as shown in FIG. 4-2, the sliding block 8 is directly adjustably mounted on the scale 7 through the first adjusting bolt 10; as shown in FIG. 9, the sliding rail 9 is fixedly mounted on the heat collecting tube support 4 through the positioning bolt 12, specifically, the positioning bolt 12 is mounted on the heat collecting tube support 4 of the trough parabolic reflector 1 to be detected at the position of the mounting and positioning hole 15 of the heat collecting tube 3, and the sliding rail 9 is fixed through the positioning bolt 12. In this way, when the detection device is used to measure and detect the parabolic reflector 1 to be detected, the scale 7 is mounted on the sliding rail 9 through the sliding block 8, and the first adjusting bolt 10 is adjusted, and the mounting position of the sliding block 8 relative to the sliding rail 9 is adjusted through the adjustment of the first adjusting bolt 10, so that the intersection point 20 of the light emitting rays 6 of the light source 5 or the intersection point 20 of the reverse extension line of the light emitting rays 6 of the light source 5 on the detection device is at the focal point of the parabolic reflector 1 to be detected (or the intersection point 20 coincides with the focal point of the parabolic reflector 1 to be detected), and the measurement and detection result of the parabolic reflector surface type precision by the method of embodiment 1 or embodiment 2 is more accurate and reliable.

[0080] Embodiment 6

[0081] The difference between this embodiment 6 and embodiment 5 is the mounting form of the sliding block 8 on the scale 7, as shown in FIG. 10, the lower end surface of the scale 7 is provided with two parallel light source supports 14, the inner sides of the light source supports 14 are respectively provided with sliding block adjusting seats 19, and the sliding block 8 is mounted on the sliding block adjusting seat 19 through the first adjusting bolt 10, and the intersection point 20 of the light source 5 and the focal point of the parabolic reflector 1 to be detected can still be adjusted by adjusting the first adjusting bolt 10, and the final measurement and detection of the parabolic reflector surface type precision is completed.

[0082] Embodiment 7

[0083] The detection device for the trough parabolic reflector surface type precision of this embodiment 7 is shown in FIG. 4-2, FIG. 10 and FIG. 10-1, the lower end surface of the scale 7 is provided with two parallel light source supports 14, and the second adjusting bolt 11 is further mounted on the light source support 14 and abuts against the sliding rail 9. In this way, the position of the scale 7 in the z-axis direction can meet the detection installation standard by adjusting the second adjusting bolt 11, so as to avoid the existence of errors in the measurement and detection data of the parabolic reflector surface type precision due to the installation error of the scale 7.

[0084] Embodiment 8

[0085] The detection device for the surface type precision of the trough-shaped parabolic reflector of this embodiment 8 is shown in FIG. 4-1, FIG. 4-2 and FIG. 10. The light source 5 is arranged on the light source support 14. A plurality of light source mounting holes are formed on the light source support 14. A plurality of light sources 5 are mounted in the light source mounting holes. The light rays 6 emitted by the light sources 5 are reflected on the parabolic reflector 1 to be detected to form a reflection and finally project a light spot on the scale disc 71 of the scale 7. Since the number of the scale discs 71 on the scale 7 and the number of the light sources 5 are one-to-one corresponding and matched, the imaging state on each scale disc 71 is calibrated, identified and corrected at this time. The surface type precision of the parabolic reflector 1 to be detected can be realized. The surface type precision can be used to accurately analyze whether the parabolic reflector 1 to be detected has installation errors, surface defects and other problems. In addition, since the scale disc 71 and the light source 5 are one-to-one corresponding in this embodiment, the detection result on the scale disc 71 can be used to obtain which specific light source 5 irradiates on the surface of the parabolic reflector 1 to be detected to cause the surface type defect. The production or installation of the parabolic reflector can be guided by the result data.

[0086] Embodiment 9

[0087] The detection device for the surface type precision of the trough-shaped parabolic reflector of this embodiment 9 is shown in FIG. 10-1. The first identification part 13-1 is arranged at the center of the lower end surface of the scale 7. The end part of the first identification part 13-1 is arc-shaped. The first identification part 13-1 is attached to the outer wall of the heat collecting pipe 3 during detection. In this way, the final installation state detection or the regular maintenance after the photoelectric heating site is operated for a period of time can be performed. At this time, the heat collecting pipe 3 has been installed on the heat collecting pipe support 4. During detection, the scale 7 is installed above the parabolic reflector 1 to be detected. The light source support 14 is erected on both sides of the heat collecting pipe support 4. The first adjusting bolt 10 is adjusted so that the sliding blocks 8 on both sides are attached to the sliding rails 9 and at the same time ensure that (1) the scale 7 is parallel to the x-axis; (2) the end part of the first identification part 13-1 is attached to the outer wall of the heat collecting pipe 3. The second adjusting 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 focal point of the parabolic reflector 1 to be detected. The shape and position precision of the parabolic reflector 1 to be detected can be realized by the method of embodiment 1 or embodiment 2.

[0088] The first identification part 13-1 of this embodiment can be used to quickly and accurately complete the standard installation of the scale 7 during detection without disassembling the heat collecting pipe 3. The use of the first identification part 13-1 can save manpower and material resources and greatly reduce the cost of disassembling the heat collecting pipe 3 required by the on-site maintenance. The detection result is intuitive and can be formed on the spot.

[0089] Embodiment 10

[0090] The detection device for the groove type parabolic reflector shape accuracy of this embodiment 10 is shown in FIG. 4-2, FIG. 10, FIG. 11, the first identification part 13-1 is arranged at the center of the lower end surface of the ruler 7, the lower end of the slide rail 9 is installed with the positioning support 21, the center of the positioning support 21 is installed with the second identification part 13-2 corresponding to the first identification part 13-1, 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 M-shaped corresponding to the triangular. By such arrangement, when the groove type solar collector is shipped or during the installation of the groove type solar collector on site, the heat collecting tube 3 has not been installed on the heat collecting tube support 4, when detecting, the ruler 7 is installed above the parabolic reflector 1 to be detected, and the light source support 14 is erected on both sides of the heat collecting tube support 4, the first adjusting bolt 10 is adjusted to make the slide blocks 8 on both sides adhere to the slide rail 9, and at the same time ensure that (1) the ruler 7 is parallel to the x-axis; (2) the end of the first identification part 13-1 adheres to the second identification part 13-2; the second adjusting bolt 11 is adjusted to make the position of the ruler 7 in the z-axis direction meet the detection installation standard, at this time the intersection point 20 of the light source 5 on the light source support 14 is at the focal point of the parabolic reflector 1 to be detected, and the shape and position accuracy of the parabolic reflector 1 to be detected can be realized by the method of embodiment 1 or embodiment 2.

[0091] As shown in FIG. 10, the detection device is installed on the temporarily installed slide rail 9 of the heat collecting tube support 4 of the parabolic reflector 1, and the first identification part 13-1 and the second identification part 13-2 at the intersection point 20 of the light rays 6 are coincided, which indicates that the light rays 6 are the light rays emitted from the focal point of the parabolic reflector 1.

[0092] If the first identification part 13-1 and the second identification part 13-2 are not coincided, the y-axis direction position of the detection device is adjusted by adjusting the first adjusting bolt 10, and the angle in the xy plane is adjusted, so that the two identification structures are coincided in the xy, yz planes, and further the x-axis direction position of the detection device is adjusted by the second adjusting bolt 11, and the angle in the xz plane is adjusted, so that the two identification structures are coincided in the xz plane, the complete centering and coinciding of the two identification structures in the xy, xz, yz planes are realized, that is, the installation centering of the detection device is completed, and then the detection of the parabolic reflector 1 to be detected can be started.

[0093] Embodiment 11

[0094] The difference between the embodiment and the foregoing embodiment is that, in order to improve the detection efficiency, 2 groups or more of the "detection equipment" can be arranged and integrated into integrated detection equipment connected in an integrated manner, as shown in FIG. 12, the first detection equipment 17 and the second detection equipment 18 are connected in parallel through a connecting structure, and the face type accuracy of two cross sections of the parabolic mirror surface 1 can be detected at the same time, the detection efficiency is improved, the detection accuracy is further improved, the system measurement error is eliminated, and the mirror surface position deviation and the face type height deviation are decoupled.

[0095] Embodiment 12

[0096] In the embodiment, the light source (5) is a visible light source, an invisible light source or an ultrasonic wave, 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, X-ray or gamma ray.

[0097] Among them, the visible light source and the invisible light source are distinguished according to the wavelength range of light. The wavelength of light determines whether the light can be seen by the human eye, so the light source is divided into two categories: visible and invisible.

[0098] The first category is a visible light source, which refers to a light source that emits light that can be perceived by the human eye. The wavelength range of visible light is about 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. Some lasers (such as red, green and blue lasers) can also emit visible light of specific wavelengths.

[0099] The second category is an invisible light source, which is light that cannot be directly seen by the human eye, and the wavelength of the light is not within the visible light range. According to the different wavelengths, invisible light can be divided into the following categories: (1) infrared light source: wavelength greater than 700 nm, infrared light can be detected by some electronic devices, but the human eye cannot see it; (2) ultraviolet light source; (3) X-ray.

[0100] In the embodiment, the above light source is used in combination with the specific embodiment 1 to realize the metrological detection of the face type accuracy of the trough parabolic mirror.

[0101] It should be noted that in the above embodiments, any non-contradictory technical solution can be arranged and combined, and those skilled in the art can exhaust all possibilities according to the mathematical knowledge of arrangement and combination, so the invention does not need to explain all the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the invention.

[0102] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for measuring and detecting the accuracy of a trough parabolic mirror surface, characterized in that, The method comprises the following steps: Step S1. Simulate the light rays emitted by the parabolic reflector (1) at the focal point with the light rays emitted by the light source (5), and project the light rays onto the parabolic reflector (1) to be detected. Step S2. Measure the shape and position accuracy of the parabolic reflector (1) to be detected according to the deviation of the reflected light rays.

2. The method for measuring and detecting the surface accuracy of a trough-shaped parabolic mirror according to claim 1, characterized in that: The light source (5) is at least two, and the light rays (6) emitted by the light source (5) intersect at the intersection point (20) and then project onto the parabolic reflector (1) to be detected, or the reverse extension lines of the light rays (6) emitted by the light source (5) intersect at the intersection point (20).

3. The method for measuring and detecting the surface accuracy of a trough-shaped parabolic mirror according to claim 2, characterized in that: The position relationship between the light source (5) and the parabolic reflector (1) to be detected is that the plane formed by the light source (5) and the light rays (6) thereof is in the same plane as the profile of the cross section of the parabolic reflector (1) to be detected, and the intersection point (20) of all light rays (6) coincides with the focal point position of the parabolic reflector (1) to be detected.

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

5. A device for measuring the surface accuracy of a trough-shaped parabolic mirror to be used in a method for measuring the surface accuracy of a trough-shaped parabolic mirror according to any one of claims 1 to 4, characterized in that: The method comprises at least two light sources (5) and a scale (7) for emitting light rays (6), the light source (5) and the scale (7) are fixed in position, the light rays (6) emitted by the light source (5) project onto the parabolic reflector (1) to be detected, produce reflection, and form light spots on the scale (7).

6. The device for testing the accuracy of a trough-shaped parabolic mirror according to claim 5, characterized in that: The scale (7) is provided with a scale disc (71), the scale disc (71) is provided with two-dimensional coordinate scale lines (711), and the number and position of the scale disc (71) correspond one-to-one to the number and position of the light spots formed by the light rays (6) projecting onto the scale (7).

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

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

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

10. The device for testing the accuracy of a trough-shaped parabolic mirror according to claim 9, characterized in that: The sliding block (8) is adjustably installed on the scale (7) through a first adjusting bolt (10).

11. The device for testing the accuracy of a trough-shaped parabolic mirror according to claim 9, characterized in that: The lower end surface of the scale (7) is provided with two parallel light source supports (14), the inner sides of the light source supports (14) are respectively provided with sliding block adjusting seats (19), and the sliding block (8) is installed on the sliding block adjusting seats (19) through the first adjusting bolt (10).

12. The device for testing the accuracy of a trough-shaped parabolic mirror according to claim 9, characterized in that: The lower end surface of the scale (7) is provided with two parallel light source supports (14), and a second adjusting bolt (11) is further installed on the light source supports (14), and the second adjusting bolt (11) abuts against the sliding rail (9).

13. The device for testing the accuracy of a trough-shaped parabolic mirror according to claim 12, characterized in that: The light source (5) is arranged on the light source support (14).

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

15. The device for testing the accuracy of a trough-shaped parabolic mirror according to claim 9, characterized in that: A first identification part (13-1) is arranged at the center of the lower end surface of the scale (7).

16. The device for testing the accuracy of a trough-shaped parabolic mirror according to claim 9, characterized in that: 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 mounted 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 mounted at the center of the positioning support (21).

17. The device for testing the accuracy of a trough-shaped parabolic mirror according to claim 15, characterized in that: The end of the first identification part (13-1) is arc-shaped, and the first identification part (13-1) is attached to the outer wall of the heat collecting pipe (3) during detection.

18. The facility for testing the surface accuracy of a trough-shaped parabolic mirror according to claim 16, characterized in that The first identification part (13-1) and the second identification part (13-2) are both triangular, or the first identification part (13-1) is triangular and the second identification part (13-2) is M-shaped corresponding to the triangle.

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

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