A rotating platform device for measuring the field angle of view of a solar direct radiation meter

Abstract

The present invention relates to the technical field of optical radiation measurement devices, and discloses a rotating platform device for measuring the field angle of a solar direct radiation meter, including a rotating tray assembly for driving a measured optical head to be directional rotated. In a power-off state, the electromagnetic release and pre-tightening assembly squeezes a static friction plate through a dynamic friction plate arranged therein, locking the rotating tray assembly. In a power-on state, the electromagnetic release and pre-tightening assembly drives the dynamic friction plate to separate from the static friction plate, releasing the rotating tray assembly. In the present invention, a direct locking device is provided at the end of the mechanical transmission. When the carrying tray drives the measured optical head, it can effectively avoid slight swinging of the carrying tray due to the existence of a transmission gap, causing errors and mistakes in the measurement, and effectively ensure accurate measurement of the optical head.

Description

Technical Field

[0001] The invention relates to the technical field of optical radiation measuring devices, in particular to a rotating platform device for measuring the viewing angle of a solar direct radiation instrument. Background Art

[0002] In the fields of solar radiation research, environmental monitoring, satellite remote sensing, etc., direct solar radiation is an important prerequisite for obtaining parameters such as atmospheric aerosol optical thickness and the transmittance of the entire atmosphere.

[0003] With the development of science and technology, the demand for direct solar radiation measurement data in various scientific fields is increasing day by day. It is necessary to develop a wide band range, high-precision resolution, and fully automated direct solar illuminance measurement device; and the functional requirements are increasing. There are more and more measurement units, more and more integrated, and the load of the optical head is getting larger and larger. In order to verify the eligibility of the optical head to measure the field of view, a suitable measurement device is needed. The previous measurement devices either have a relatively small load; or a large load is bulky, takes up space, and is difficult to operate; and due to the existence of mechanical transmission clearance, the angle of the rotating device shaft will drift at the set position, which will bring uncertain errors to the inertial element and affect the accuracy of the measured data. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a rotating platform device for measuring the field of view angle of a solar direct radiation meter, which solves the problem in the prior art that during the test process for verifying the field of view angle measurement qualification of an optical head, the accuracy of the measured data is difficult to ensure due to the existence of mechanical transmission gaps and the lack of an efficient and accurate optical head measurement platform.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A rotating platform device for measuring the field angle of a solar direct radiation meter comprises a rotating tray assembly for driving a measured optical head to be rotated in a directional manner, a static friction plate is arranged on the rotating tray assembly, a rotating base is rotatably arranged at the lower part of the rotating tray assembly, an electromagnetic release and pre-tightening assembly is arranged between the rotating base and the rotating tray assembly, in a power-off state, the electromagnetic release and pre-tightening assembly squeezes the static friction plate through the dynamic friction plate arranged therein, and locks the rotating tray assembly, and in a power-on state, the electromagnetic release and pre-tightening assembly drives the dynamic friction plate to separate from the static friction plate, and releases the rotating tray assembly.

[0007] Preferably, a lower support ring is fixedly connected to the rotating base, a rotating inner ring is fixedly connected to the lower support ring, the rotating tray assembly is rotatably connected to the outer side of the rotating inner ring, and the rotating inner ring is fixedly connected to the electromagnetic release and pre-tightening assembly.

[0008] Preferably, the electromagnetic release and pre-tightening assembly includes an electromagnetic assembly and a pre-tightening assembly, the lower part of the dynamic friction plate is engaged and connected with a dynamic friction disk, and the electromagnetic assembly is arranged between the dynamic friction disk and the rotating inner ring. In the power-off state, the pre-tightening assembly presses the dynamic friction disk and causes the dynamic friction to squeeze the static friction plate. In the power-on state, the magnetic field of the electromagnetic assembly drives the dynamic friction disk and the dynamic friction plate thereon to separate from the static friction plate, thereby releasing the locking state.

[0009] Preferably, the electromagnetic component includes a yoke seat fixedly connected to the rotating inner ring and mica provided with an excitation coil, the upper part of the yoke seat is movably connected to an armature ring, the armature ring is fixedly connected to the dynamic friction disk, the dynamic friction plate is clamped and arranged on the dynamic friction disk, the pre-tightening component is arranged between the dynamic friction disk and the rotating inner ring, and the pre-tightening component is evenly arranged on the outside of the yoke seat and matches the outer shape of the yoke seat.

[0010] Preferably, the preload assembly includes a ball sleeve fixedly connected to the rotating inner ring and a guide shaft fixedly connected to the dynamic friction disk. The guide shaft and the ball sleeve are slidably inserted into each other. A preload elastic member is provided on the outside of the ball sleeve. In the power-off state, the preload elastic member squeezes the guide shaft and the dynamic friction disk, so that the dynamic friction plate is pressed against the static friction plate.

[0011] Preferably, the rotating tray assembly includes a rotating worm gear outer ring rotatably connected to a rotating inner ring, the rotating worm gear outer ring is fixedly connected to a carrying tray via a carrying sleeve, and the static friction plate is fixedly arranged on the cavity wall of the carrying sleeve and is located above the dynamic friction plate.

[0012] Preferably, the raceways of the rotating inner ring and the rotating worm gear outer ring are symmetrical about the axis and are curved surfaces with a pressure angle of 20 degrees, and can simultaneously withstand axial, radial, and positive and negative bidirectional loads. Balls are arranged between the rotating inner ring and the rotating worm gear outer ring.

[0013] Preferably, a shell is fixedly connected to the rotating base, the bearing sleeve passes through the shell, and a driving component is arranged in the inner cavity of the shell, and the driving component is used for directional rotation of the outer ring of the rotating worm gear.

[0014] Preferably, the driving assembly includes a driving frame fixedly connected to the rotating base, a driving motor is fixedly provided on one side of the driving frame via a motor mounting seat, an output shaft end of the driving motor is fixedly connected to a worm via a coupling, the worm and the driving frame are rotatably connected via a bearing, a sealed motor cover matching the driving motor is fixedly connected to the outer casing, an induction plate is fixedly connected to the outer ring of the rotating worm gear, and an optical coupler switch matching the induction plate is fixedly provided on the lower support ring.

[0015] Preferably, a plurality of horizontal adjustment components are symmetrically arranged on the lower end surface of the rotating base, and the horizontal adjustment components include a fixed screw and an adjustment foot, and the adjustment foot is threadedly connected to the fixed screw.

[0016] The present invention has the following beneficial effects:

[0017] The rotating platform device for measuring the field angle of the solar direct radiation meter is mechanically locked for angle adjustment by arranging a dynamic friction plate and a static friction plate between the rotating tray assembly and the base. In the locked state, it can effectively prevent the slight swing of the workbench due to the existence of the transmission gap during the test, which causes errors and mistakes in the measurement, thereby improving the accuracy of the measurement. At the same time, since the measuring optical head contains highly sensitive components, it is easily interfered. In this mechanical locking state, the electromagnetic coil is powered off at this time, which will not interfere with the relevant circuits, and will certainly not interfere with the measured signal. Therefore, it is a clean and pollution-free locking state, which is conducive to accurate measurement of the optical head and improves the reliability of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall main structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the overall bottom-up structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the top view structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the BB cross-section structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the CC cross-section structure of the present invention;

[0023] Figure 6 It is a schematic diagram of the layout structure of the dynamic friction plate and the static friction plate in the power-on state and the power-off state of the present invention;

[0024] Figure 7 This is a schematic diagram of the layout structure of the dynamic friction disc of the present invention;

[0025] Figure 8 It is a schematic diagram of the layout structure of the yoke seat and the pre-tightening assembly of the present invention;

[0026] Fig. 9 It is a schematic diagram of the cross-section structure of the electromagnetic component and the pre-tightening component DD of the present invention;

[0027] Fig.10 It is a schematic diagram of the worm layout structure of the present invention;

[0028] Fig.11 This is a schematic diagram of the layout structure of the drive motor and the worm of the present invention;

[0029] Fig.12 Schematic diagram of the layout structure of the worm and the rotating worm wheel outer ring of the present invention

[0030] Fig.13 This is a schematic diagram of the cross-sectional structure of the level adjustment component EE of the present invention;

[0031] Fig.14 It is a schematic diagram of the layout of the present invention when used to assist the optical head in measurement.

[0032] In the figure: 1, rotating base; 11, lower support ring; 12, rotating inner ring; 2, electromagnetic release and preload assembly; 21, electromagnetic assembly; 211, yoke seat; 212, mica; 213, excitation coil; 214, armature ring; 22, preload assembly; 221, ball sleeve; 222, preload elastic member; 223, guide shaft; 23, dynamic friction disc; 24, dynamic friction plate; 25, static friction plate; 3, rotating tray assembly; 31, rotating worm gear outer ring; 32, bearing sleeve ; 33. Carrying tray; 34. Induction sheet; 35. Optocoupler switch; 4. Driving assembly; 41. Driving frame; 42. Motor mounting seat; 43. Driving motor; 44. Coupling; 45. Worm; 46. Manual adjustment ring; 5. Housing; 6. Sealed motor cover; 7. Horizontal adjustment assembly; 71. Fixing screw; 72. Adjusting foot; 8. Sealing pressure ring; 9. First sealing element; 10. Second sealing element; 101. Third sealing element; 102. Fourth sealing element. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1The present invention provides a technical solution: a rotating platform device for measuring the field angle of a solar direct radiation meter, comprising a rotating tray assembly 3 for driving a measured optical head to be rotated in a directional manner, a static friction plate 25 being arranged on the rotating tray assembly 3, a rotating base 1 being rotatably arranged at the lower part of the rotating tray assembly 3, an electromagnetic release and pre-tightening assembly 2 being arranged between the rotating base 1 and the rotating tray assembly 3, in a power-off state, the electromagnetic release and pre-tightening assembly 2 squeezes the static friction plate 25 through a dynamic friction plate 24 arranged therein, and locks the rotating tray assembly 3, in a power-on state, the electromagnetic release and pre-tightening assembly 2 drives the dynamic friction plate 24 to separate from the static friction plate 25, and releases the rotating tray assembly 3.

[0035] The present invention mechanically locks the angle adjustment by arranging a dynamic friction plate 24 and a static friction plate 25 between the rotating tray assembly 3 and the base. In the locked state, it can effectively prevent the slight swing of the workbench due to the existence of the transmission gap during the test, which causes errors and mistakes in the measurement, thereby improving the accuracy of the measurement. At the same time, since the optical head for measurement contains highly sensitive components, it is easily interfered. In this mechanical locking state, the electromagnetic coil is powered off at this time, which will not interfere with the relevant circuits, and will certainly not interfere with the measured signal. Therefore, it is a clean and pollution-free locking state, which is conducive to accurate measurement of the optical head and improves the reliability of the measurement results.

[0036] In this embodiment, a lower support ring 11 is fixedly connected to the rotating base 1, a rotating inner ring 12 is fixedly connected to the lower support ring 11, a rotating tray assembly 3 is rotatably connected to the outer side of the rotating inner ring 12, and the rotating inner ring 12 is fixedly connected to the electromagnetic release and preload assembly 2.

[0037] In this embodiment, the electromagnetic release and pre-tightening component 2 includes an electromagnetic component 21 and a pre-tightening component 22. The lower part of the dynamic friction plate 24 is engaged with the dynamic friction disc 23. The electromagnetic component 21 is arranged between the dynamic friction disc 23 and the rotating inner ring 12. In the power-off state, the pre-tightening component 22 presses the dynamic friction disc 23 and causes the dynamic friction to squeeze the static friction plate 25. In the power-on state, the electromagnetic component 21 drives the dynamic friction disc 23 and the dynamic friction plate 24 thereon to separate from the static friction plate 25 under the action of the magnetic field, thereby releasing the locking state.

[0038] Reference Figure 5-9As shown, in this embodiment, the electromagnetic assembly 21 includes a yoke seat 211 fixedly connected to the rotating inner ring 12 and a mica 212 provided with an excitation coil 213, an armature ring 214 is movably connected to the upper part of the yoke seat 211, a dynamic friction disc 23 is fixedly connected to the armature ring 214, and the dynamic friction plate 24 is arranged on the dynamic friction disc 23 in a clamping manner, and the pre-tightening assembly 22 is arranged between the dynamic friction disc 23 and the rotating inner ring 12, and the pre-tightening assembly 22 is evenly arranged outside the yoke seat 211 and matches the outer shape of the yoke seat 211. The yoke seat 211 is distributed around the excitation coil 213 to restrict the leakage magnetic flux of the induction coil from diffusing outward. The mica 212 plays an isolating and insulating role to prevent the coil leakage from interfering with the control system, thereby improving the anti-interference of the system and the accuracy of the measurement process. The electromagnetic assembly 21 and the pre-tightening assembly 22 are combined into a special physical locking mechanism, which prevents the drying and contamination of the measurement signal and improves the accuracy and scientificity of the measurement result. The wreath-shaped compact design of the yoke seat 211 and the preload assembly 22 makes perfect use of the space of the inner ring and is perfectly connected and integrated with the rotating inner ring 12. The static friction plate 25 is fixed on the inner surface of the support sleeve by fitting it with the machined recessed hole and the convex shaft on the inner surface of the support sleeve. The dynamic friction plate 24 is fixed on the upper surface of the dynamic friction disc 23 by fitting it with the convex shaft and the recessed hole. A gap is provided between the dynamic friction plate 24 and the static friction plate for the motion stroke to assist the action under the control of the system. The friction plate adopts a high friction resistance brake pad, which is made of reinforced fiber as the base material and is composited with special metals and ceramics. It has high strength and good wear resistance. The material of the yoke seat 211 and the armature ring 214 is ferrite material, which has high magnetization intensity and low hysteresis loss, good stability and good mechanical strength.

[0039] Reference Figure 5 and 9As shown, in this embodiment, the preload assembly 22 includes a ball sleeve 221 fixedly connected to the rotating inner ring 12 and a guide shaft 223 fixedly connected to the dynamic friction plate 23. The guide shaft 223 and the ball sleeve 221 are slidably plugged. A preload elastic member 222 is arranged outside the ball sleeve 221. In the power-off state, the preload elastic member 222 squeezes the guide shaft 223 and the dynamic friction plate 23, so that the dynamic friction plate 24 presses the static friction plate 25. The guide shaft 223 is a guide shaft with a flange, and the flange and the lower surface of the dynamic friction plate 23 are fastened together by countersunk screws; the ball sleeve 221 is also a guide sleeve with a flange edge, and the flange of the sleeve is fixed on the upper surface of the rotating inner ring 12. The preload elastic member 222 adopts a spring, which is installed outside the ball sleeve 221 and integrated together to complete the functions of guiding the linear up and down movement and spring reset, and at the same time has the function of resisting overturning moment. The linear guide motion pair of the ball has ultra-low friction resistance and relatively smooth motion, making the motion reset of the dynamic friction disc 23 more reliable, stable and durable. The preload components 22 of the three sets of ball sliding sleeves 221 are evenly arranged along the circumference of the rotating inner ring 12; and are evenly connected to the circumference of the dynamic friction disc 23, so that the spring preload force is evenly pressed on the friction disc, improving the uniformity of the fit and thus improving the reliability of the locking.

[0040] In this embodiment, the rotating tray assembly 3 includes a rotating worm gear outer ring 31 rotatably connected to the rotating inner ring 12, the rotating worm gear outer ring 31 is fixedly connected to a carrying tray 33 via a carrying sleeve, and the static friction plate 25 is fixedly arranged on the cavity wall of the carrying sleeve and is located above the dynamic friction plate 24.

[0041] Reference Figure 4 and 5 As shown, in this embodiment, the raceways of the rotating inner ring 12 and the rotating worm wheel outer ring 31 are symmetrical about the axis and are curved surfaces with a pressure angle of 20 degrees, which can simultaneously bear axial, radial, and positive and negative bidirectional loads, and balls are arranged between the rotating inner ring 12 and the rotating worm wheel outer ring 31. The design of the raceways of the rotating inner ring 12 and the rotating worm wheel outer ring 31 is a curved surface structure device with a pressure angle of 20 degrees about the axis, which can simultaneously bear axial, radial, and positive and negative bidirectional loads. The combination of the two components forms a heavy-duty slewing support assembly to support the rotation. The large-disk slewing support has a large load capacity, high rigidity, and high rotation accuracy. At the same time, a ball retainer is designed to maintain the stability of operation, and the rotating inner ring 12 is provided with auxiliary structures such as oil filling holes and some installation process holes. At the same time, the meshing tooth surface of the worm wheel is directly processed on the structure of the rotating outer ring for the rotation drive of the worm wheel. This structure is exquisitely designed, simplifies the composition and connection of the structure, improves the overall rotation accuracy, and reduces the volume of the structure.

[0042] In this embodiment, a housing 5 is fixedly connected to the rotating base 1 , the bearing sleeve passes through the housing 5 , and a driving assembly 4 is arranged in the inner cavity of the housing 5 . The driving assembly 4 is used to rotate the worm gear outer ring 31 to directional rotate.

[0043] Reference Fig.10 and 11 As shown, in this embodiment, the driving assembly 4 includes a driving frame 41 fixedly connected to the rotating base 1, a driving motor 43 is fixedly arranged on one side of the driving frame 41 through a motor mounting seat 42, a worm 45 is fixedly connected to the output shaft end of the driving motor 43 through a coupling 44, the worm 45 is rotatably connected to the driving frame 41 through a bearing, a sealed motor cover 6 matching the driving motor 43 is fixedly connected to the outer shell 5, a sensing sheet 34 is fixedly connected to the rotating worm gear outer ring 31, and an optical coupler switch 35 matching the sensing sheet 34 is fixedly arranged on the lower support ring 11. The driving frame 41 is an integrated design, and the front and rear bearing supports are integrally processed on the frame, which ensures the concentricity of the front and rear rotating supports, makes assembly more convenient and easy to operate, reduces the precision error caused by assembly and the interference to the system operation, and makes the system run smoother and more accurately. The rotating support method adopts a back-to-back angular contact bearing structure design to improve the support rigidity and anti-deformation ability, and can withstand large loads and impact loads. The induction sheet 34 and the optical coupler switch 35 cooperate with the control system to realize the control of the angular displacement of the rotation according to the required requirements. When the drive motor 43 is started, the worm 45 is driven to rotate through the coupling 44, and the rotation of the worm 45 drives the rotating worm outer ring 31 to rotate, thereby driving the bearing sleeve 32 to rotate, and the bearing sleeve 32 drives the rotation of the bearing tray 33. The bearing tray 33 drives the rotary motion of the measuring instrument, and adopts this transmission mode of driving the worm 45 through the drive component 4. It is a spatial vertical cross-axis motion pair transmission form, which compresses the height of the transmission device and avoids the drawback of the measuring rotating device with a large height dimension caused by the transmission mode of the axis direct connection; it is convenient for the measurement and clamping of the instrument. The drive motor 43 preferably adopts a stepping motor, and a manual adjustment ring is arranged on its end face. According to the needs of the actual test, at a specific angle position, the relative motion origin is manually set in cooperation with the host computer control software.

[0044] Reference Fig.13As shown, in this embodiment, a plurality of horizontal adjustment components 7 are symmetrically arranged on the lower end surface of the rotating base 1, and the horizontal adjustment component 7 includes a fixed screw 71 and an adjustment foot 72, and the adjustment foot 72 is threadedly connected to the fixed screw 71. The horizontal adjustment component 7 is composed of a fixed screw 71 and an adjustment foot 72. The fixed rod is a structure with a milled flat shaft on the upper part of the shoulder, and a fine-tuning screw structure on the lower part of the shoulder, which is used in conjunction with the adjustment foot 72 to achieve horizontal adjustment of the instrument. After the fixed rod and the corresponding flat shaft holes at the bottom of the base are tightly fitted and installed, the self-locking function during rotation adjustment can be achieved. The adjustment foot 72 is an external hexagonal form with an internal thread structure, which is convenient for clamping and adjustment.

[0045] In actual application, in order to improve the adaptability of the entire device to the application environment, the connection between the bearing tray 33, the outer shell 5 and the bearing sleeve 32, the connection between the lower support ring 11 and the rotating base 1, the connection between the outer shell 5 and the rotating base 1, and the bearing tray 33 and the bearing sleeve are completely sealed through sealing grooves and sealing elements. Figure 4 and 5 As shown, the entire device achieves complete sealing through the design of multiple sealing elements and sealing grooves. Specifically, the outer shell 5 is designed with a shaft seal that seals a rotating bearing sleeve. When the shaft seal is installed, the groove and the outer surface are filled with vacuum silicone grease to reduce friction resistance, so that the operation is smoother and the durability of the shaft seal element is improved. The rotating base 1 is designed with a surrounding sealing groove that fits the surface of the outer shell 5. After installation, the connection between the outer shell 5 and the rotating base 1 is sealed. The overall dynamic and static fully sealed structural design prevents the coil from being affected by moisture and affecting the realization of the structural function and the corrosion of internal components, thereby improving durability and adaptability to harsh environments.

[0046] When the drive motor 43 is powered on and maintained under the control of the control system, the excitation coil 213 begins to be energized, generating a magnetic field and closing the magnetic circuit with the armature stroke (see the attached figure for details). Fig. 9The magnetic lines of force in the middle are shown in the figure. Under the action of magnetic force, the yoke seat 211 pulls the armature, and under the guidance of the ball sleeve, it moves linearly downward, thereby driving the dynamic friction disc 23 and the dynamic friction plate 24 fixed thereon to move downward. The dynamic friction plate 24 and the static friction plate 25 are disengaged and enter a non-locked state. The control system issues a driving rotation angle displacement command, and the motor drives the worm 45, the rotating worm gear outer ring, the bearing sleeve 32, and then drives the rotation of the bearing tray 33. When the movement is completed, the control system sends a signal to send a power-off command to the excitation coil 213 to control the on-off element. The excitation coil 213 is powered off and the magnetic force disappears. Under the action of the force of the preload elastic member 222, the dynamic friction disc 23 is supported by the flange of the guide shaft 223, and moves upward in a straight line under the linear guidance of the linear ball sleeve 221, and then moves upward with the dynamic friction plate 24, and fits with the static friction plate 25. Since the structure pre-compresses the preload elastic member 222, the dynamic friction plate 24 and the static friction plate 25 fit tightly, and enter the locking state under the maintenance of high resistance static friction. The optical head is a highly sensitive component and is easily interfered. In this mechanical locking state, the electromagnetic coil at this time has no electricity, so it will not interfere with the relevant circuits, and of course it will not interfere with the measured signal, so it is a clean and pollution-free locking state. In the locked state, it prevents the slight swing of the workbench due to the existence of the transmission gap during the test, which causes errors and mistakes in the measurement, so the accuracy of the measurement is improved.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotating platform device for measuring the field angle of a solar direct radiation meter, comprising a rotating tray assembly for driving an optical head to be measured to rotate in a directional manner, characterized in that: A static friction plate is arranged on the rotating tray assembly, and a rotating base is rotatably arranged at the lower part of the rotating tray assembly, and an electromagnetic release and pre-tightening assembly is arranged between the rotating base and the rotating tray assembly. In a power-off state, the electromagnetic release and pre-tightening assembly squeezes the static friction plate through the dynamic friction plate arranged therein, and locks the rotating tray assembly. In a power-on state, the electromagnetic release and pre-tightening assembly drives the dynamic friction plate to separate from the static friction plate, and releases the rotating tray assembly; the electromagnetic release and pre-tightening assembly includes an electromagnetic assembly and a pre-tightening assembly, and the lower part of the dynamic friction plate is engaged and connected with a dynamic friction disk, and the electromagnetic assembly is arranged between the dynamic friction disk and the rotating inner ring. In a power-off state, the pre-tightening assembly presses the dynamic friction disk and makes the dynamic friction squeeze the static friction plate, and in a power-on state Under the action of the magnetic field of the electromagnetic component, the dynamic friction disk and the dynamic friction plate thereon are driven to separate from the static friction plate to release the locking state; a lower support ring is fixedly connected to the rotating base, a rotating inner ring is fixedly connected to the lower support ring, the rotating tray assembly is rotatably connected to the outer side of the rotating inner ring, the rotating inner ring is fixedly connected to the electromagnetic release and pre-tightening assembly, the electromagnetic assembly includes a yoke seat fixedly connected to the rotating inner ring and mica provided with an excitation coil, an armature ring is movably connected to the upper part of the yoke seat, the dynamic friction disk is fixedly connected to the armature ring, the dynamic friction plate is clamped and arranged on the dynamic friction disk, the pre-tightening assembly is arranged between the dynamic friction disk and the rotating inner ring, and the pre-tightening assembly is evenly arranged on the outside of the yoke seat and matches the outer shape of the yoke seat.

2. The rotating platform device for measuring the field angle of a solar direct radiation meter according to claim 1, characterized in that: The preload assembly includes a ball sleeve fixedly connected to the rotating inner ring and a guide shaft fixedly connected to the dynamic friction plate. The guide shaft and the ball sleeve are slidably plugged in. A preload elastic member is arranged on the outside of the ball sleeve. In the power-off state, the preload elastic member squeezes the guide shaft and the dynamic friction plate so that the dynamic friction plate is pressed against the static friction plate.

3. The rotating platform device for measuring the field angle of a solar direct radiation meter according to claim 2, characterized in that: The rotating tray assembly includes a rotating worm gear outer ring rotatably connected to a rotating inner ring, the rotating worm gear outer ring is fixedly connected to a carrying tray via a carrying sleeve, and the static friction plate is fixedly arranged on the cavity wall of the carrying sleeve and is located above the dynamic friction plate.

4. The rotating platform device for measuring the field angle of a solar direct radiation meter according to claim 3, characterized in that: The raceways of the rotating inner ring and the rotating worm gear outer ring are bilaterally symmetrical about the axis and are curved surfaces with a pressure angle of 20 degrees, and can simultaneously withstand axial, radial, and positive and negative bidirectional loads. Balls are arranged between the rotating inner ring and the rotating worm gear outer ring.

5. The rotating platform device for measuring the field angle of a solar direct radiation meter according to claim 4, characterized in that: The rotating base is fixedly connected with a shell, the bearing sleeve passes through the shell, and the inner cavity of the shell is arranged with a driving component, and the driving component is used for directional rotation of the outer ring of the rotating worm gear.

6. The rotating platform device for measuring the field angle of a solar direct radiation meter according to claim 5, characterized in that: The driving assembly includes a driving frame fixedly connected to the rotating base, a driving motor is fixedly arranged on one side of the driving frame through a motor mounting seat, an output shaft end of the driving motor is fixedly connected to a worm through a coupling, the worm and the driving frame are rotatably connected through a bearing, a sealed motor cover matching the driving motor is fixedly connected to the outer shell, an induction sheet is fixedly connected to the outer ring of the rotating worm gear, and an optical coupler switch matching the induction sheet is fixedly arranged on the lower support ring.

7. The rotating platform device for measuring the field angle of a solar direct radiation meter according to claim 6, characterized in that: A plurality of horizontal adjustment components are symmetrically arranged on the lower end surface of the rotating base. The horizontal adjustment components include a fixed screw and an adjustment foot. The adjustment foot is threadedly connected to the fixed screw.

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