Centroid testing device and method suitable for solar cell panel

Abstract

The invention relates to a centroid testing device and method suitable for a solar cell panel, and the device achieves the centroid measurement of a product veneer when the product veneer is in a natural suspension state through a flexible hanging mode. The electric sliding table is used for automatically adjusting the balance weight, the laser sensor feeds back the offset of the solar cell panel in the adjusting process in real time, and the mass center position of the cell panel is calculated according to a formula. The mass center testing process is simplified according to the measuring steps, and high-precision measurement of the mass center of the solar cell panel is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of spacecraft ground equipment, and in particular relates to a centroid testing device and method suitable for solar panels. Background Art

[0002] Solar panels are the energy source of satellites and are usually used to power satellites and spacecraft. When the satellite is launched, the solar panels are in a folded state. After the satellite and rocket are separated, they are unfolded and the direction of the satellite is constantly adjusted during flight, so that the solar panels are aimed at the sun and provide energy for the entire satellite. Solar panels are unfolded in a weightless environment in space. The same zero-gravity environment must be provided during ground testing to ensure that the panels are in a standard posture and suspended through the center of mass, thereby offsetting the influence of gravity.

[0003] Solar panels are non-standard panels, and the center of mass position of the panels must be determined through a center of mass test. Traditional center of mass testing methods mostly use multi-point support quality measurement methods, with more than three mass sensors supporting the measuring platform. The center of mass is calculated by the position of each sensor relative to the reference center. The traditional center of mass test measuring platform uses a human-powered torsion trapezoidal lifting mechanism to achieve the lifting of the measuring platform. The operation is time-consuming and labor-intensive, and the accuracy is difficult to guarantee. At the same time, the traditional test system uses a single measurement method, which requires multiple measurements and weight corrections to complete the center of mass measurement. The test process is cumbersome and time-consuming.

[0004] In the context of mass production of satellites, in order to complete the centroid test of multiple models of solar panels in a short period of time, there is an urgent need for a testing device that can automatically complete the centroid test task and collect centroid data with high precision. Summary of the invention

[0005] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a centroid testing device and method suitable for solar panels to achieve high-precision measurement of the centroid of solar panels.

[0006] The solution to the technical problem of the present invention is: a centroid test device suitable for solar panels, the device includes a profile tooling, a lifting and mounting frame, a hanging drive mechanism, a wire rope lifting electric push rod, a guide wheel, a wire rope, a centroid adjustment unit, a hanging mounting part, and a laser displacement sensor; wherein:

[0007] The hanging drive mechanism drives the lifting installation frame to move along the vertical direction of the profile tooling. The wire rope lifting electric push rod is installed on the lifting installation frame. The wire rope lifting electric push rod controls the rise and fall of the wire rope. One end of the wire rope is connected to the output end of the wire rope lifting electric push rod, and the other end is turned through the guide wheel and then vertically downwardly connected to the center of mass adjustment unit;

[0008] The center of mass adjustment unit includes an adjustment platform, a connecting piece, a first electric slide, a second electric slide, a first adjustment counterweight, a second adjustment counterweight, a Hooke's hinge, a first basic counterweight, and a second basic counterweight;

[0009] The adjustment platform is a cross platform, including mutually perpendicular X-direction and Y-direction beams; the upper end of the connecting piece is connected to the wire rope, and the lower end is connected to the adjustment platform through a Hook hinge; the first electric slide and the first adjustment counterweight are installed at one end of the X-direction beam of the cross platform, the first basic counterweight is fixedly installed at the other end of the X-direction beam of the cross platform, the second electric slide and the second adjustment counterweight are installed at one end of the Y-direction beam of the cross platform, and the second basic counterweight is fixedly installed at the other end of the Y-direction beam of the cross platform; the first electric slide is used to move the position of the first adjustment counterweight; the second electric slide is used to move the position of the second adjustment counterweight; the hanging mounting piece is installed at the lower end of the X-direction beam or the Y-direction beam of the cross platform;

[0010] At least five laser displacement sensors are installed on the profile tooling, of which at least three are installed on a preset reference plane to measure the displacement of the surface of the solar panel in a naturally suspended state; and at least two are installed on a straight line perpendicular to the ground to measure the displacement of one side of the solar panel in a naturally suspended state.

[0011] Preferably, the suspension drive mechanism comprises a mounting base plate, a guide rail, a slider, a ball screw and a drive mechanism;

[0012] The mounting base is tightly connected to the profile fixture, the guide rail is fixedly installed on the profile fixture, the lifting mounting frame is connected to the mounting base through a slider, the ball screw is connected to the slider, and the driving mechanism is used to drive the ball screw to provide lifting power for the lifting mounting frame.

[0013] Preferably, the suspension drive mechanism also includes two positioning columns, and two positioning pins and a locking mechanism are provided on the connecting piece at the upper end of the center of mass adjustment unit. One end of the positioning column is fixed on the lifting mounting frame, and the other end is used to match and dock with the positioning pin. The locking mechanism is used to lock and unlock the positioning column.

[0014] Preferably, the interfaces between the two positioning columns and the positioning pins are different to prevent mis-insertion.

[0015] Another technical solution of the present invention is: a method for testing the centroid of a solar panel, the method comprising the following steps:

[0016] S1. Hang the standard parts on the center of mass adjustment unit, and use the standard parts to calibrate the initial positions L2 and L3 of the laser displacement sensor installation reference surface, the first basic counterweight, and the second basic counterweight;

[0017] S2, driving the electric push rod to lower the hanging mounting piece to the upper surface of the solar panel, unlocking the connecting piece of the hanging mounting piece adjustment unit, and connecting the hanging mounting piece to the hanging hole on the solar panel;

[0018] S3, the driving mechanism drives the lifting mounting frame to rise, so that the solar panel is in a natural suspended state;

[0019] S4, moving the first adjusting weight and the second adjusting weight until the surface of the solar panel is parallel to the reference plane and the side surface is perpendicular to the ground;

[0020] S5. Calculate the mass center offset of the measured solar panel according to the displacement L1 of the first adjusting weight and the displacement L4 of the second adjusting weight, the gravity F1 of the first adjusting weight, the gravity F2 of the first basic weight, the gravity F3 of the second basic weight, the gravity F4 of the second adjusting weight, and the gravity G of the solar panel.

[0021] Preferably, the mass center offset of the solar panel under test is:

[0022]

[0023]

[0024] Wherein, x is the displacement of the mass center of the solar panel under test along the X direction, and y is the displacement of the mass center of the solar panel under test along the Y direction.

[0025] Preferably, a laser displacement sensor located on the reference plane is used to determine whether the surface of the solar panel is parallel to the reference plane:

[0026] When the reading difference between the three laser displacement sensors located on the reference plane is less than a preset value, it is considered that the surface of the solar panel is parallel to the reference plane, otherwise, it is considered that the surface of the solar panel is not parallel to the reference plane.

[0027] Preferably, when the reading difference between at least two sensors installed on a straight line perpendicular to the ground is less than a preset value, it is considered that the side of the solar panel is perpendicular to the ground, otherwise, it is considered that the side of the solar panel is not perpendicular to the ground.

[0028] The beneficial effects of the present invention compared with the prior art are:

[0029] (1) The present invention adopts a fast displacement micro electric cylinder to realize the centroid test of a single board of a product, which effectively shortens the test time and can control the centroid test time within 3 minutes.

[0030] (2) The lifting height of the lifting installation frame of the present invention is automatically adjusted, which can meet the measurement requirements of various types of solar panels and improve work efficiency.

[0031] (3) The present invention uses a high-precision magnetic scale to record the displacement of the counterweight block during center of mass adjustment, and at the same time uses a laser displacement sensor to feedback the leveling status of the battery panel, so that the center of mass test adjustment accuracy can be controlled within 0.5mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG. 1( a ) is a front view schematic diagram of the structure of a solar panel centroid testing device according to an embodiment of the present invention.

[0033] FIG. 1( b ) is a schematic diagram of the back side of the structure of the solar panel centroid testing device according to an embodiment of the present invention.

[0034] Figure 2 It is a schematic diagram of components such as a center of mass adjustment unit and a hanging mounting part according to an embodiment of the present invention.

[0035] Figure 3 The figure is a schematic diagram of the centroid adjustment process of the hanging member adjustment unit according to an embodiment of the present invention.

[0036] Figure 4 Schematic diagram of the centroid test principle of an embodiment of the present invention.

[0037] In the figure, 1. profile tooling; 2. lifting mounting frame; 3. center of mass adjustment unit; 4. hanging mounting part; 5. laser displacement sensor; 6. mounting base plate; 7. guide rail slider; 8. ball screw; 9. driving mechanism; 10. wire rope lifting electric push rod; 11. guide wheel; 12. wire rope; 13. adjustment platform; 14. locking mechanism; 15. electric slide; 16. adjustment counterweight; 17. universal joint; 18. spring pin; 19. base counterweight; 20. locking pin; 21. solar panel. DETAILED DESCRIPTION

[0038] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0039] As shown in FIG. 1(a) and FIG. 1(b), the present invention provides a mass center test device suitable for solar panels for rapid mass center test of solar panels. The mass center test device includes a profile tooling 1, a lifting and mounting frame 2, a hanging drive mechanism, a wire rope lifting electric push rod 10, a guide wheel 11, a wire rope 12, a mass center adjustment unit 3, a hanging mounting part 4, and a laser displacement sensor 5; wherein:

[0040] The hanging drive mechanism drives the lifting mounting frame 2 to move along the vertical direction of the profile tooling 1. The wire rope lifting electric push rod 10 is installed on the lifting mounting frame 2. The wire rope lifting electric push rod 10 controls the rise and fall of the wire rope 12. One end of the wire rope 12 is connected to the output end of the wire rope lifting electric push rod 10, and the other end is turned through the guide wheel 11 and then vertically downwardly connected to the center of mass adjustment unit 3;

[0041] The center of mass adjustment unit 3 includes an adjustment platform 13, a connecting piece, a first electric slide, a second electric slide, a first adjustment counterweight, a second adjustment counterweight, a Hooke's hinge 17, a locking pin 18, a first basic counterweight, and a second basic counterweight;

[0042] Two electric slides 15, denoted as a first electric slide and a second electric slide;

[0043] Two adjusting weights 16, denoted as a first adjusting weight and a second adjusting weight;

[0044] Two basic counterweights 19, denoted as a first basic counterweight and a second basic counterweight;

[0045] The adjustment platform 13 is a cross platform, including mutually perpendicular X-direction and Y-direction beams; the upper end of the connecting piece is connected to the wire rope 12, and the lower end is connected to the adjustment platform 13 through a Hook hinge 17; the locking pin 18 is used to lock the connecting piece and the adjustment platform 13; the first electric slide and the first adjustment counterweight are installed at one end of the X-direction beam of the cross platform, the first basic counterweight is fixedly installed at the other end of the X-direction beam of the cross platform, the second electric slide and the second adjustment counterweight are installed at one end of the Y-direction beam of the cross platform, and the second basic counterweight is fixedly installed at the other end of the Y-direction beam of the cross platform; the first electric slide is used to move the position of the first adjustment counterweight; the second electric slide is used to move the position of the second adjustment counterweight; the hanging mounting member 4 is installed at the lower end of the X-direction beam or the Y-direction beam of the cross platform;

[0046] At least five laser displacement sensors 5 are installed on the profile fixture 1, of which at least three are installed on a preset reference plane to measure the displacement of the surface of the solar panel in a naturally suspended state; and at least two are installed on a straight line perpendicular to the ground to measure the displacement of one side of the solar panel in a naturally suspended state.

[0047] Preferably, the suspension drive mechanism comprises a mounting base plate 6, a guide rail, a slider, a ball screw 8 and a drive mechanism 9;

[0048] The mounting base 6 is fastened to the profile fixture 1 by screws, the guide rail is fixedly mounted on the profile fixture 1, the lifting mounting frame 2 is connected to the mounting base 6 by a slider, the ball screw 8 is connected to the slider, and the driving mechanism 9 is used to drive the ball screw 8 to provide lifting power for the lifting mounting frame 2.

[0049] Preferably, the suspension drive mechanism also includes two positioning columns, and two positioning pins and a locking mechanism are provided on the connecting piece at the upper end of the center of mass adjustment unit. One end of the positioning column is fixed on the lifting mounting frame, and the other end is used to match and dock with the positioning pin. The locking mechanism is used to lock and unlock the positioning column.

[0050] Preferably, the interfaces between the two positioning posts and the positioning pins are different to prevent mis-insertion. The purpose of locking the positioning posts and the positioning pins is to prevent the centroid adjustment unit from shaking when the hanging mounting member 4 is moved, and the purpose of locking the contact positioning posts and the positioning pins is to facilitate the subsequent matching of the clamping hole and the hanging hole.

[0051] The purpose of the counterweight position adjustment is to adjust the counterweight movement through the electric slide control, and the magnetic scale accurately feeds back the counterweight displacement, and calculate the center of mass offset according to the displacement of the counterweight when the final battery panel is leveled.

[0052] Based on the above device, the present invention also provides a method for testing the centroid of a solar panel, the method comprising the following steps:

[0053] S1. Before hanging the solar panel, hang the standard parts on the center of mass adjustment unit, and use the standard parts to calibrate the initial positions L2 and L3 of the laser displacement sensor installation reference surface, the first basic counterweight, and the second basic counterweight to ensure the accuracy of subsequent tests. After the calibration is completed, the transfer equipment transfers the solar panel to the test docking position.

[0054] S2, drive the electric push rod to make the hanging mounting member 4 drop to the upper end surface of the solar panel (about 5mm height from the upper end surface of the solar panel), unlock the connecting piece of the hanging member adjustment unit, and connect the hanging mounting member 4 to the hanging hole on the solar panel;

[0055] S3, the driving mechanism drives the lifting mounting frame to rise, so that the solar panel is in a natural suspended state;

[0056] S4, moving the first adjusting weight and the second adjusting weight until the surface of the solar panel is parallel to the reference plane and the side surface is perpendicular to the ground;

[0057] S5. Calculate the mass center offset of the measured solar panel according to the displacement L1 of the first adjusting weight and the displacement L4 of the second adjusting weight, the gravity F1 of the first adjusting weight, the gravity F2 of the first basic weight, the gravity F3 of the second basic weight, the gravity F4 of the second adjusting weight, and the gravity G of the solar panel.

[0058] The mass center offset of the solar panel under test is:

[0059]

[0060]

[0061] Wherein, x is the displacement of the mass center of the solar panel under test along the X direction, and y is the displacement of the mass center of the solar panel under test along the Y direction.

[0062] After calculating the mass center offset of the solar panel under test, the mass center offset of the solar panel under test can be transmitted to the PLC and fed back to the regulating mechanism to achieve closed-loop regulation of the mass center.

[0063] The laser displacement sensor uses the three-point plane determination method to determine whether the product is parallel to the reference plane. The laser displacement sensor located on the reference plane is used to determine whether the surface of the solar panel is parallel to the reference plane:

[0064] When the reading difference between the three laser displacement sensors located on the reference plane is less than a preset value, it is considered that the surface of the solar panel is parallel to the reference plane, otherwise, it is considered that the surface of the solar panel is not parallel to the reference plane.

[0065] When the reading difference between at least two sensors installed on a straight line perpendicular to the ground is less than a preset value, it is considered that the side of the solar panel is perpendicular to the ground, otherwise, it is considered that the side of the solar panel is not perpendicular to the ground.

[0066] Example:

[0067] See also Figure 2 , Figure 3 , the solar panel 20 is fixed to the test device hanging installation part 4 through the transfer device, and the lifting installation frame 2 is powered by the driving mechanism 9, and moves to the appropriate height according to the corresponding specifications of the solar panel 20 until the solar panel under test leaves the ground. The wire rope lifting electric push rod 10 controls the wire rope 12 to descend until the locking pin 20 is released and the spring pin 18 is unlocked. The electric slide in the center of mass adjustment unit 3 works, driving the adjustment counterweight 16 to move, and the laser displacement sensor 5 measures the distance to the back and side of the solar panel 20 in real time. The plane is determined by the three-point plane determination method. When the difference in readings of any two laser sensors 5 corresponding to the same plane is less than 0.3mm, the electric slide in the corresponding direction stops moving, and the system records the displacement of the electric slide. After the displacement of the electric slide in two directions is recorded, according to Figure 4 The centroid test principle calculates the centroid offset of the solar panel 20, and the calculation formula is:

[0068]

[0069] Wherein, x is the displacement of the mass center of the solar panel under test along the X direction, and y is the displacement of the mass center of the solar panel under test along the Y direction.

[0070] After the test is completed, the data processing software can achieve the following functions:

[0071] According to the results collected by sensors at different positions, the center of mass offset is calculated in real time and the data is transmitted to PLC;

[0072] Visual interface: the above collected / transmitted data needs to be displayed instantly on the system interface and support manual reading.

[0073] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A centroid test device for solar panels, characterized in that It comprises a profile tooling (1), a lifting and mounting frame (2), a hanging driving mechanism, a wire rope lifting electric push rod (10), a guide wheel (11), a wire rope (12), a center of mass adjustment unit (3), a hanging mounting part (4), and a laser displacement sensor (5); wherein: The hanging drive mechanism drives the lifting installation frame (2) to move along the vertical direction of the profile tooling (1). The wire rope lifting electric push rod (10) is installed on the lifting installation frame (2). The wire rope lifting electric push rod (10) controls the lifting and lowering of the wire rope (12). One end of the wire rope (12) is connected to the output end of the wire rope lifting electric push rod (10), and the other end is turned through the guide wheel (11) and then vertically downwardly connected to the center of mass adjustment unit (3); The center of mass adjustment unit (3) comprises an adjustment platform (13), a connecting piece, a first electric slide (15), a second electric slide, a first adjustment counterweight, a second adjustment counterweight, a Hooke's hinge (17), a first basic counterweight, and a second basic counterweight; The adjustment platform (13) is a cross platform, comprising mutually perpendicular X-direction and Y-direction cross beams; the upper end of the connecting member is connected to the steel wire rope (12), and the lower end is connected to the adjustment platform (13) through a Hook hinge (17); the first electric slide and the first adjustment counterweight are installed at one end of the X-direction cross beam of the cross platform, the first basic counterweight is fixedly installed at the other end of the X-direction cross beam of the cross platform, the second electric slide and the second adjustment counterweight are installed at one end of the Y-direction cross beam of the cross platform, and the second basic counterweight is fixedly installed at the other end of the Y-direction cross beam of the cross platform; the first electric slide is used to move the position of the first adjustment counterweight; the second electric slide is used to move the position of the second adjustment counterweight; the hanging mounting member (4) is installed at the lower end of the X-direction cross beam or the Y-direction cross beam of the cross platform; At least five laser displacement sensors (5) are installed on the profile tooling (1), wherein at least three are installed on a preset reference plane for measuring the displacement of the surface of the solar panel in a naturally suspended state; and at least two are installed on a straight line perpendicular to the ground for measuring the displacement of one side surface of the solar panel in a naturally suspended state.

2. A centroid testing device for solar panels according to claim 1, characterized in that: The suspension drive mechanism comprises a mounting base plate (6), a guide rail, a slider, a ball screw (8) and a drive mechanism (9); The mounting base plate (6) is tightly connected to the profile fixture (1), the guide rail is fixedly mounted on the profile fixture (1), the lifting mounting frame (2) is connected to the mounting base plate (6) via a slider, the ball screw (8) is connected to the slider, and the driving mechanism (9) is used to drive the ball screw (8) to provide lifting power for the lifting mounting frame (2).

3. A centroid testing device for solar panels according to claim 1, characterized in that: The suspension drive mechanism also includes two positioning columns. Two positioning pins and a locking mechanism are provided on the connecting piece at the upper end of the center of mass adjustment unit. One end of the positioning column is fixed on the lifting mounting frame, and the other end is used to match and dock with the positioning pin. The locking mechanism is used to lock and unlock the positioning column.

4. A centroid testing device for solar panels according to claim 1, characterized in that: The interfaces between the two positioning columns and the positioning pins are different to prevent mis-insertion.

5. A method for testing the centroid of a solar panel, characterized in that The steps include: S1. Hang the standard parts on the center of mass adjustment unit, and use the standard parts to calibrate the initial positions L2 and L3 of the laser displacement sensor installation reference surface, the first basic counterweight, and the second basic counterweight; S2, driving the electric push rod to lower the hanging mounting member (4) to the upper end surface of the solar panel, unlocking the connecting member of the hanging member adjustment unit, and connecting the hanging mounting member (4) to the hanging hole on the solar panel; S3, the driving mechanism drives the lifting mounting frame to rise, so that the solar panel is in a natural suspended state; S4, moving the first adjusting weight and the second adjusting weight until the surface of the solar panel is parallel to the reference plane and the side surface is perpendicular to the ground; S5. Calculate the mass center offset of the measured solar panel according to the displacement L1 of the first adjusting weight and the displacement L4 of the second adjusting weight, the gravity F1 of the first adjusting weight, the gravity F2 of the first basic weight, the gravity F3 of the second basic weight, the gravity F4 of the second adjusting weight, and the gravity G of the solar panel.

6. A method for testing the center of mass of a solar panel according to claim 5, characterized in that The mass center offset of the solar panel under test is: Wherein, x is the displacement of the mass center of the solar panel under test along the X direction, and y is the displacement of the mass center of the solar panel under test along the Y direction.

7. A method for testing the center of mass of a solar panel according to claim 5, characterized in that Use a laser displacement sensor located on the reference plane to determine whether the surface of the solar panel is parallel to the reference plane: When the reading difference between the three laser displacement sensors located on the reference plane is less than a preset value, it is considered that the surface of the solar panel is parallel to the reference plane, otherwise, it is considered that the surface of the solar panel is not parallel to the reference plane.

8. A method for testing the centroid of a solar panel according to claim 5, characterized in that When the reading difference between at least two sensors installed on a straight line perpendicular to the ground is less than a preset value, it is considered that the side of the solar panel is perpendicular to the ground, otherwise, it is considered that the side of the solar panel is not perpendicular to the ground.

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