Electromagnetic compatibility detection device and detection method

Abstract

The embodiment of the present application provides an electromagnetic compatibility detection device and a detection method, which relate to the field of electromagnetic compatibility detection technology. An electromagnetic compatibility detection device includes a base frame, the outer side of the base frame is fixedly connected to a stand, and legs are fixedly connected to the four sides of the bottom of the stand, a top frame is arranged above the base frame, and the outer side of the top frame is fixedly connected to a side cover; the inner cavity of the top frame is provided with an adjustment component used in conjunction with the side cover, and the adjustment component includes a double-headed motor fixed to the top of the base frame, and the bottom of the adjustment component near the side cover is provided with a shielding component used in conjunction with the stand; one side of the adjustment component is respectively provided with a transposition component and a detection component used in conjunction with the shielding component and the stand. Through the cooperation of the adjustment component, the shielding component, the transposition component, the detection component and the rotation component, based on the shielding protection condition, a combination of transposition and rotation is adopted to achieve efficient and accurate multi-faceted electromagnetic compatibility detection effect on the detection object.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic compatibility detection, and in particular relates to an electromagnetic compatibility detection device and a detection method. Background Art

[0002] Electromagnetic compatibility test equipment is an analytical instrument that analyzes whether the device or system under test can work normally in its electromagnetic environment and does not cause unbearable electromagnetic interference to anything in the environment. It is mainly to confirm that the electromagnetic interference generated by the device to the environment in normal operation does not exceed a certain limit, and that the device has a certain degree of immunity to the electromagnetic interference in the environment.

[0003] In the prior art (the patent application with publication number CN116400104B and patent name of electromagnetic compatibility detection device for rail transit vehicles), the displacement adjustment adaptability of the electromagnetic compatibility detector is improved to meet the electromagnetic compatibility detection requirements of electronic products at different positions, without the need to manually adjust the detection position of electronic products frequently, thereby improving the detection efficiency of electronic products. In the process of implementing this technical solution, it is found that there are at least the following problems in the prior art.

[0004] Electromagnetic compatibility testing devices are used during electromagnetic compatibility testing of electrical accessories, electronic products, electrical instruments, etc. However, most of the electromagnetic compatibility testing devices currently used only have a single and simple testing function, and cannot achieve efficient and accurate electromagnetic compatibility testing effects on the test objects by combining transposition and rotation under shielding protection conditions. Summary of the invention

[0005] The present application aims to at least solve one of the technical problems that the electromagnetic compatibility detection devices currently used in the prior art mostly have only a single and simple detection function and cannot achieve efficient and accurate multi-faceted electromagnetic compatibility detection effects on the detection object by combining transposition and rotation under shielding protection conditions. To this end, the present application proposes an electromagnetic compatibility detection device and detection method.

[0006] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0007] An electromagnetic compatibility detection device comprises a base frame, a stand frame is fixedly connected to the outside of the base frame, legs are fixedly connected to the four sides of the bottom of the stand frame, a top frame is arranged above the base frame, and a side cover is fixedly connected to the outside of the top frame;

[0008] The inner cavity of the top frame is provided with an adjustment component used in conjunction with the side cover, and the adjustment component includes a double-headed motor fixed to the top of the bottom frame, and the bottom of the adjustment component near the side cover is provided with a shielding component used in conjunction with the stand;

[0009] A transposition component and a detection component used in conjunction with the shielding component and the stand are respectively arranged on one side of the adjustment component.

[0010] Preferably: an output shaft of the double-headed motor is fixedly connected to a rotating shaft, and the top of the rotating shaft is fixedly connected to a first driving bevel gear, first driven bevel gears are arranged around the top of the first driving bevel gear, and the outer side of the first driven bevel gear is fixedly connected to a first electric push rod, a long rotating rod is sleeved on the outer side of the first electric push rod, and a cam frame used in conjunction with a side cover is fixedly connected to the side of the long rotating rod away from the first driven bevel gear.

[0011] Preferably: the shielding assembly includes a pulley frame rolling on the cam frame, and the bottom of the pulley frame is fixedly connected to a lifting rod, the bottom of the lifting rod passes through the side cover and is fixedly connected to a shielding top cover, and the top of the stand is provided with a sealing groove that is snap-fitted with the shielding top cover, the bottom of the stand is fixedly connected to a shielding bottom cover that is used in conjunction with the shielding top cover, and the shielding top cover is fixedly connected to T-shaped rods that slide with the stand and the legs all around, and the bottom of the T-shaped rod is fixedly connected to a return spring that is fixedly fitted with the legs.

[0012] Preferably: the shifting assembly includes vertical grooves opened at the bottom around the rotating shaft, and a second electric push rod is embedded in the bottom of the inner cavity of the rotating shaft, the piston rod of the second electric push rod is fixedly connected to a driving circular gear that slides with the rotating shaft, and the driving circular gear is provided with sliding openings that slide with the vertical grooves around the rotating shaft, differential circular gears are arranged around the driving circular gear, and a gear ring is meshed on the outer side of the differential circular gear.

[0013] Preferably: the detection component includes a sealing port opened on the inner side of the shielding top cover, and a bent arm is fixedly connected to one side of the gear ring, a sealing frame that is snap-fitted with the sealing port is fixedly connected to the side of the bent arm away from the gear ring, and an electromagnetic compatibility detection instrument used in conjunction with the stand is fixedly connected to the inner side of the sealing frame, a position sensor is fixedly connected to the top of the electromagnetic compatibility detection instrument, and high-precision cameras are fixedly connected to both sides of the bottom of the electromagnetic compatibility detection instrument, and the high-precision cameras are distributed in a symmetrically inclined state along the central axis of the electromagnetic compatibility detection instrument.

[0014] Preferably: both sides of the platform are fixedly connected with side frames, and the side frames are fixedly connected with the placement table near the outer side of the platform, the side frames are fixedly connected with the columns on one side near the placement table, and the bottom of the top frame is fixedly connected with the middle cover that rotates with the rotating shaft and the differential circular gear through a connecting piece.

[0015] Preferably: an observation window is provided on the outer side of the shielding top cover, and the inner wall of the observation window is embedded with tempered glass, and the outer surface of the tempered glass is sprayed with transparent shielding paint, the inner cavity of the middle cover is provided with an annular guide rail, and the inner cavity of the annular guide rail is rotatably connected with an annular sliding end fixedly matched with the gear ring.

[0016] Preferably: a sliding recess which slides with the middle cover is provided at the top of the outer side of the bent arm, and short rotating rods which rotate with the side frames are rotatably connected to both sides of the inner cavity of the stand, and a ring-shaped rotating frame which cooperates with the shielding top cover and the shielding bottom cover is fixedly connected to the inner side of the short rotating rod.

[0017] Preferably: threaded rods are threadedly connected to both sides of the annular rotating frame, and screwing heads are fixedly connected to the outer sides of the threaded rods, anti-slip grooves are provided around the screwing heads, and a positioning head for use with the annular rotating frame is provided on the inner side of the threaded rods.

[0018] An electromagnetic compatibility testing method, according to the electromagnetic compatibility testing device, comprises the following steps:

[0019] Step 1: First, place the three groups of electrical accessories to be tested on the three groups of placement tables for pre-inspection, and then place the three groups of electrical accessories at the center of the inner side of the positioning head in the three groups of annular rotating racks, and rotate the screwing head clockwise. The screwing head drives the threaded rod to move inward, and the threaded rod drives the positioning head to move toward the surface of the electrical accessories. After the three groups of positioning heads tighten and fix the electrical accessories, first control the first group of first electric push rods to start and drive the first driven bevel gear to reach the meshing part of the first drive bevel gear, and then control the double-headed motor to start and drive the first group of first driven bevel gears to rotate forward through the first drive bevel gear meshed in place on the rotating shaft, and the first group of first driven bevel gears drives the long rotating rod to rotate accordingly, and the long rotating rod drives the cam frame to rotate accordingly;

[0020] Step 2: Next, the first group of cam frames drives the shielding top cover on the lifting rod to move downward through the pulley frame. At this time, the first group of pulley frames rolls along the edge of the cam frame to its lower dead point, and the lifting rod drives the shielding top cover to move down and stop in the sealing groove of the stand. The shielding bottom cover at the bottom of the stand shields the electrical accessories in the first group of annular rotating frames in a positioned state. At the same time, the shielding top cover that has moved down into place also drives the T-shaped rod to slide down in the hollow cavity of the support leg, and after the reset spring is compressed downward into place, the double-headed motor is first controlled to pause, and then the first group of first electric push rods are controlled to close and drive the first driven bevel gear to disengage from the meshing portion of the first driving bevel gear to the initial state, thereby completing the shielding protection work of the electrical accessories in the first group of the annular rotating frame in a positioned state.

[0021] Step 3, then, the sliding mouth and the vertical groove play a sliding limit role between the driving circular gear and the rotating shaft, first control the second electric push rod to drive the driving circular gear to move down to the meshing part of the three sets of differential circular gears, and then control the double-headed motor to restart and drive the three sets of differential circular gears to rotate forward synchronously through the driving circular gear that is meshed in place, and the annular guide rail and the annular sliding end play a role of rotation support for the gear ring, then the three sets of differential circular gears that rotate forward synchronously drive the gear ring to rotate in the middle cover, and while the gear ring drives the curved arm to rotate forward, the sliding notch on the curved arm slides circumferentially on the surface of the middle cover;

[0022] Step 4. At the same time, the bending arm drives the blocking frame to rotate forward to the blocking opening on the shielding top cover after the first group is moved down into place, and the blocking frame blocks the blocking opening on the shielding top cover of the first group, so that the first group of shielding top covers, the stand and the shielding bottom cover form a complete closed shielding space to prevent external electromagnetic radiation and other factors from interfering with the electromagnetic compatibility detection of the electrical accessories in the stand. At the same time, the position sensor monitors the displacement conversion position of the electromagnetic compatibility detection instrument reaching the first group of stands in real time, and then the electromagnetic compatibility detection instrument after the blocking frame is in place performs electromagnetic compatibility detection on the electrical accessories in the first group of annular rotating frames in a positioning state. During this period, the electromagnetic compatibility detection screen and position screen between the electromagnetic compatibility detection instrument and the electrical accessories are tracked and photographed by high-precision cameras symmetrically tilted on both sides. The inspection personnel can also observe the electromagnetic compatibility detection of the internal electrical accessories through the observation window on the first group of shielding top covers. After that, the double-headed motor is controlled to pause first, and then the second electric push rod is controlled to close and drive the driving circular gear to move up and disengage from the meshing part of the three sets of differential circular gears to the initial position;

[0023] Step 5. Complete the electromagnetic compatibility work on the electrical accessories in the first group of racks that are in a positioned state, remove the corresponding ones and place them on the placement table, and so on. First, synchronously disengage the sealing rack together with the electromagnetic compatibility testing instrument and rotate them to between the first group of shielding top covers and the second group of shielding top covers, waiting for the second group of shielding top covers to move down and close until the second group of shielding top covers move down into place. Similarly, seal the electromagnetic compatibility testing instrument on the sealing rack at the sealing opening on the second group of shielding top covers, and perform electromagnetic compatibility work on the electrical accessories in a positioned state in the second group of racks. Similarly, perform electromagnetic compatibility work on the electrical accessories in a positioned state in the third group of racks. You can also control the three groups of first electric push rods to open at the same time, and move the three groups of shielding top covers synchronously down and onto the racks, so that the electromagnetic compatibility testing instrument on the sealing rack reaches the sealing openings on the three groups of shielding top covers in turn, and perform electromagnetic compatibility work on the electrical accessories in a positioned state in the three groups of racks in an orderly manner.

[0024] An electromagnetic compatibility detection device and detection method of the present invention have the following advantages:

[0025] 1. This electromagnetic compatibility testing device, during the electromagnetic compatibility testing of electrical accessories, electronic products, electrical instruments, etc., firstly, a double-headed motor provides a unified driving source, then one or three groups of first electric push rods are opened and the meshing stroke between one or three groups of first driven bevel gears and first driving bevel gears is adjusted, and then the one or three groups of first driven bevel gears that are meshed in place are driven by the rotating shaft to cooperate with the first driving bevel gear, and then one or three groups of long rotating rods drive the cam frame to achieve the rotation effect.

[0026] 2. This electromagnetic compatibility testing device, then, one or three groups of cam frames drive the lifting rod on the pulley frame to move down or up through the height difference between the upper and lower dead points, so as to achieve a height adjustment effect for one or three groups of shielding top covers, so that one or three groups of shielding top covers that are snapped into the sealing groove and the shielding bottom covers form a complete enclosed shielding space for one or three groups of platforms. At the same time, the T-rod and the reset spring achieve elastic buffering and elastic reset effects for the shielding top covers during the height adjustment process, so as to meet the electromagnetic shielding requirements of the objects to be tested in one or three groups of platforms, so as to prevent external radiation, electromagnetic and other signals from affecting the electromagnetic compatibility testing of the objects to be tested, and improve the electromagnetic compatibility testing accuracy of the objects to be tested.

[0027] 3. This electromagnetic compatibility testing device, then, first the vertical groove and the sliding mouth play the role of sliding limit cooperation for the driving circular gear, and then the second electric push rod adjusts the height of the driving circular gear, and the double-headed motor is used as a unified driving source, and then the driving circular gear that is engaged in place is driven by the rotating shaft to drive the three sets of differential circular gears to achieve synchronous rotation effect, and the three sets of differential circular gears that rotate synchronously drive the ring gear to rotate, providing rotational driving force for the subsequent transposition of the electromagnetic compatibility testing instrument.

[0028] 4. This electromagnetic compatibility testing device, finally, the rotating gear ring drives the sealing frame through the bent arm to perform horizontal rotation processing, and at the same time, the horizontally rotating sealing frame drives the electromagnetic compatibility testing instrument to orderly shift to the sealing port on the shielding top cover after the three groups of shielding are in place, so as to achieve accurate and rapid shifting effect for the electromagnetic compatibility testing instrument and seal the shielding top cover as a whole. At the same time, the position sensor and high-precision camera monitor and capture the image of the shifted position of the electromagnetic compatibility testing instrument in real time, and then the electromagnetic compatibility testing instrument after the shift is in place can achieve efficient electromagnetic compatibility testing effect on the test object, which can be completed in one go and meet the electromagnetic compatibility testing needs of multiple groups of objects to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a structural initial state diagram of an electromagnetic compatibility detection device of the present invention;

[0031] Figure 2 This is a structural working state diagram of an electromagnetic compatibility detection device of the present invention;

[0032] Figure 3 It is an internal view of the initial state of the structure of an electromagnetic compatibility detection device of the present invention;

[0033] Figure 4 It is an internal view of the structure of an electromagnetic compatibility detection device of the present invention in a working state;

[0034] Figure 5 It is a working state diagram of the stand, legs, adjustment assembly and shielding assembly structure of the present invention;

[0035] Figure 6 It is a partial side cross-sectional view of the adjustment component and the shielding component structure of the present invention;

[0036] Figure 7 It is a cross-sectional exploded view of the stand, legs, short rotating rod, annular rotating frame, threaded rod, screwing head and positioning head structure of the present invention;

[0037] Figure 8 It is a side view of the transposition assembly and the detection assembly structure of the present invention;

[0038] Fig. 9 It is a partial cross-sectional view of the rotating shaft structure of the present invention;

[0039] Fig.10 A bottom view of the detection assembly structure of the present invention;

[0040] Fig.11 It is a top view of the structure of the stand, adjustment assembly and rotation assembly of the present invention;

[0041] Fig.12 It is a partial cross-sectional view of the double-headed motor and the rotating assembly structure of the present invention;

[0042] Fig.13 It is a partial side view of the structure of the stand and the rotating assembly of the present invention;

[0043] Fig.14 It is a bottom view of the top frame, side cover and middle cover structure of the present invention;

[0044] Fig.15 It is a top view of the base frame, platform frame, side frame, placement table and column structure of the present invention.

[0045] Explanation of the markings in the figure: 1. Base frame; 2. Stand; 3. Legs; 4. Top frame; 5. Side cover; 6. Adjustment assembly; 61. Double-headed motor; 62. Rotating shaft; 63. First driving bevel gear; 64. First driven bevel gear; 65. First electric push rod; 66. Long rotating rod; 67. Cam frame; 7. Shielding assembly; 71. Pulley frame; 72. Lifting rod; 73. Shielding top cover; 74. Sealing groove; 75. Shielding bottom cover; 76. T-bar; 77. Reset spring; 8. Transposition assembly; 81. Vertical groove; 82. Second electric push rod; 83. Driving circular gear; 84. Sliding mouth; 85. Differential circular gear; 86. Gear ring; 9. Detection assembly; 91. Sealing mouth; 92. Bending arm; 9 3. Blocking frame; 94. Electromagnetic compatibility testing instrument; 95. Position sensor; 96. High-precision camera; 10. Rotating assembly; 101. Second driving bevel gear; 102. Second driven bevel gear; 103. Third electric push rod; 104. Reciprocating screw; 105. Screw sleeve; 106. Bracket; 107. Rack plate; 108. Driven circular gear; 109. Limiting slide; 1010. Limiting slide groove; 11. Side frame; 12. Placement table; 13. Column; 14. Middle cover; 15. Observation window; 16. Annular guide rail; 17. Annular sliding end; 18. Sliding notch; 19. Short rotating rod; 20. Annular rotating frame; 21. Threaded rod; 22. Screwing head; 23. Positioning head. DETAILED DESCRIPTION

[0046] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0047] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0050] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0051] like Figure 1-Figure 15 As shown, an electromagnetic compatibility detection device of the present invention comprises a base frame 1, a stand 2 is fixedly connected to the outside of the base frame 1, and legs 3 are fixedly connected to the four sides of the bottom of the stand 2, and the inner cavity of the legs 3 adopts a hollow design, a top frame 4 is arranged above the base frame 1, and a side cover 5 is fixedly connected to the outside of the top frame 4, and the side cover 5 is marked with corresponding digital identifications, which are "1", "2" and "3" respectively, so that objects to be detected can be detected differently;

[0052] The inner cavity of the top frame 4 is provided with an adjustment component 6 used in conjunction with the side cover 5, and the adjustment component 6 includes a double-headed motor 61 fixed on the top of the bottom frame 1, and the bottom of the adjustment component 6 near the side cover 5 is provided with a shielding component 7 used in conjunction with the stand 2 to meet the electromagnetic shielding requirements of the objects to be detected in one or three groups of stands 2 to prevent external radiation, electromagnetic and other signals from affecting the electromagnetic compatibility detection of the objects to be detected. One side of the adjustment component 6 is respectively provided with a transposition component 8 and a detection component 9 used in conjunction with the shielding component 7 and the stand 2 to meet the electromagnetic compatibility detection requirements of multiple groups of objects to be detected, and effectively improve the electromagnetic compatibility detection accuracy of the objects to be detected.

[0053] like Figure 5-Figure 10 As shown, one output shaft of the double-headed motor 61 is fixedly connected to the rotating shaft 62, and the top of the rotating shaft 62 is fixedly connected to the first driving bevel gear 63, and the first driven bevel gear 64 is arranged around the top of the first driving bevel gear 63, and the first electric push rod 65 is fixedly connected to the outer side of the first driven bevel gear 64. The double-headed motor 61 first provides a unified driving source, and then one or three groups of first electric push rods 65 are opened and the meshing stroke between one or three groups of first driven bevel gears 64 and the first driving bevel gear 63 is adjusted. Then, a long rotating rod 66 is sleeved on the outer side of the first electric push rod 65, and the side of the long rotating rod 66 away from the first driven bevel gear 64 is fixedly connected to a cam frame 67 used in conjunction with the side cover 5, and then the rotating shaft 62 drives the one or three groups of first driven bevel gears 64 and the first driving bevel gear 63 to transmit and cooperate, and the one or three groups of long rotating rods 66 drive the cam frame 67 to achieve the rotation effect;

[0054] The shielding assembly 7 includes a pulley frame 71 rolling on the cam frame 67, and a lifting rod 72 is fixedly connected to the bottom of the pulley frame 71. One or three groups of cam frames 67 drive the lifting rod 72 on the pulley frame 71 to move down or up through the height difference between the upper and lower dead points. The bottom of the lifting rod 72 passes through the side cover 5 and is fixedly connected to the shielding top cover 73. The lifting rod 72 that moves down or up can achieve a height adjustment effect for one or three groups of shielding top covers 73, and a sealing groove 74 that is snap-fitted with the shielding top cover 73 is opened on the top of the stand 2. A shielding bottom cover 75 that is used in conjunction with the shielding top cover 73 is fixedly connected to the bottom of the stand 2, so that one or three groups of shielding top covers 73 snap-fitted into the sealing groove 74 and the shielding bottom cover 75 form a complete closed shielding space for one or three groups of stands 2.

[0055] The shielding top cover 73 is fixedly connected with T-shaped rods 76 that are slidably matched with the stand 2 and the legs 3 on all sides, and the bottom of the T-shaped rod 76 is fixedly connected with a reset spring 77 that is fixedly matched with the legs 3. At the same time, the T-shaped rod 76 and the reset spring 77 realize elastic buffering and elastic reset effects for the shielding top cover 73 during the height adjustment process, meeting the electromagnetic shielding requirements of the objects to be detected in one or three groups of stands 2, so as to prevent external radiation, electromagnetic and other signals from affecting the electromagnetic compatibility detection of the objects to be detected, and improve the accuracy of electromagnetic compatibility detection of the objects to be detected;

[0056] Both sides of the stand 2 are fixedly connected with side frames 11, and the side frames 11 are fixedly connected with a placement table 12 on the outside near the stand 2, which is convenient for temporarily placing the object to be tested. The side frame 11 is fixedly connected with a column 13 on one side near the placement table 12, and the bottom of the top frame 4 is fixedly connected with a middle cover 14 that rotates with the rotating shaft 62 and the differential circular gear 85 through a connecting piece, so that the side frames 11, the placement table 12 and the middle cover 14 are firmly supported and connected as a whole. An observation window 15 is opened on the outside of the shielding top cover 73, and the inner wall of the observation window 15 is embedded with tempered glass, so that the inspector can observe the electromagnetic compatibility test of the object to be tested in the shielding top cover 73 from the outside of the observation window 15, and the outer surface of the tempered glass is sprayed with transparent shielding paint, which plays an electromagnetic shielding role for the tempered glass.

[0057] The shifting assembly 8 includes a vertical groove 81 formed at the bottom of the rotating shaft 62, and a second electric push rod 82 is embedded at the bottom of the inner cavity of the rotating shaft 62. The piston rod of the second electric push rod 82 is fixedly connected to a driving circular gear 83 that is slidably matched with the rotating shaft 62, and a sliding opening 84 that is slidably matched with the vertical groove 81 is formed around the driving circular gear 83 near the rotating shaft 62. The vertical groove 81 and the sliding opening 84 first play a sliding limit role for the driving circular gear 83, and then the second electric push rod 82 adjusts the height of the driving circular gear 83.

[0058] Differential circular gears 85 are arranged around the driving circular gear 83, and the outer side of the differential circular gear 85 is meshed with a gear ring 86. The double-headed motor 61 is used as a unified driving source, and then the driving circular gear 83 that is meshed in place is driven by the rotating shaft 62 to drive the three sets of differential circular gears 85 to achieve synchronous rotation. The three sets of differential circular gears 85 that rotate synchronously drive the gear ring 86 to rotate, providing a rotational driving force for the subsequent transposition of the electromagnetic compatibility testing instrument 94. The inner cavity of the middle cover 14 is provided with an annular guide rail 16, and the inner cavity of the annular guide rail 16 is rotatably connected to an annular sliding end 17 that is fixedly matched with the gear ring 86, which plays a role of rotational support for the gear ring 86, thereby improving the stability of the gear ring 86 during rotation.

[0059] The detection component 9 includes a sealing port 91 provided on the inner side of the shielding top cover 73, and a bent arm 92 is fixedly connected to one side of the gear ring 86, and a sealing frame 93 which is engaged with the sealing port 91 is fixedly connected to the side of the bent arm 92 away from the gear ring 86. The rotating gear ring 86 drives the sealing frame 93 to rotate horizontally through the bent arm 92, and an electromagnetic compatibility detection instrument 94 used in conjunction with the stand 2 is fixedly connected to the inner side of the sealing frame 93. The electromagnetic compatibility detection instrument 94 is driven by the horizontally rotating sealing frame 93 to orderly transpose to the sealing port 91 on the shielding top cover 73 after the three groups of shielding are in place, so as to achieve an accurate and rapid transposition effect for the electromagnetic compatibility detection instrument 94 and also seal the shielding top cover 73 as a whole;

[0060] A position sensor 95 is fixedly connected to the top of the electromagnetic compatibility testing instrument 94, and high-precision cameras 96 are fixedly connected to both sides of the bottom of the electromagnetic compatibility testing instrument 94. The high-precision cameras 96 are symmetrically tilted and distributed along the central axis of the electromagnetic compatibility testing instrument 94. At the same time, the position sensor 95 and the high-precision camera 96 ​​monitor the transposed position of the electromagnetic compatibility testing instrument 94 in real time and capture the picture. The electromagnetic compatibility testing instrument 94 after transposition can achieve efficient electromagnetic compatibility testing effect on the test object, which can meet the electromagnetic compatibility testing requirements of multiple groups of objects to be tested.

[0061] A sliding notch 18 is provided at the top of the outer side of the curved arm 92, which is slidably matched with the middle cover 14, which is beneficial to the rotation stability of the curved arm 92. Short rotating rods 19 that are rotatably matched with the side frame 11 are rotatably connected to both sides of the inner cavity of the stand 2. Pointers are fixedly connected to both ends of the short rotating rod 19, and a scale groove is provided on the outer side of the center of the side frame 11. The short rotating rod 19 first drives the pointer to rotate. When the pointer rotates to the corresponding scale groove, the value is read to understand the current rotation angle of the short rotating rod 19 and the object to be detected. The inner side of the rotating rod 19 is fixedly connected with an annular rotating frame 20 used in conjunction with the shielding top cover 73 and the shielding bottom cover 75, which serves as a rotation support for the annular rotating frame 20. Threaded rods 21 are threadedly connected to both sides of the annular rotating frame 20, and a screwing head 22 is fixedly connected to the outer side of the threaded rod 21. Anti-slip grooves are provided around the screwing head 22, and a positioning head 23 used in conjunction with the annular rotating frame 20 is provided on the inner side of the threaded rod 21, which is convenient for tightening, positioning, and loosening and removing the object to be detected.

[0062] like Figure 11-13 As shown, during the electromagnetic compatibility test of electrical accessories, electronic products, electrical instruments, etc., most of the objects to be tested are in a fixed state and cannot be rotated and adjusted, resulting in that the electromagnetic compatibility testing instrument 94 can only test one side of the object to be tested, resulting in incomplete electromagnetic compatibility testing of the object to be tested and low accuracy. The base frame 1 is provided with a rotating assembly 10 used in conjunction with the stand 2 on all four sides, and the rotating assembly 10 includes a second driving bevel gear 101 fixed on another output shaft of the double-headed motor 61, and the second driving bevel gear 101 is provided with a second driven bevel gear 102 on all four sides, and the outer side of the second driven bevel gear 102 is fixedly connected to a third electric push rod 103, and the meshing stroke between one group or three groups of second driven bevel gears 102 and the second driving bevel gear 101 is adjusted by one or three groups of third electric push rods 103, and then the double-headed motor 61 drives one group or three groups of second driven bevel gears 102 to rotate through the second driving bevel gear 101 that is meshed in place;

[0063] The outer side of the third electric push rod 103 is sleeved with a reciprocating screw 104 that rotates with the base frame 1, and a screw sleeve 105 is threadedly connected to the reciprocating screw 104. The bottom of the screw sleeve 105 is fixedly connected to a bracket 106 that slides with the base frame 1, and both sides of the bottom of the bracket 106 are fixedly connected to a rack plate 107. The rack plate 107 is meshed with a driven circular gear 108 that is fixedly matched with the short rotating rod 19. The screw sleeve 105 on the reciprocating screw 104 is driven by one or three groups of second driven bevel gears 102 to move back and forth horizontally, and one or three groups of screw sleeves 105 drive the rack plate 107 to move back and forth horizontally through the bracket 106. The rack plate 107 that moves back and forth horizontally drives The driven circular gear 108 rotates forward and reversely accordingly, and the driven circular gear 108 rotating forward and reversely drives the object to be detected positioned in the annular rotating frame 20 to rotate forward and reversely through the short rotating rod 19, so that multiple surfaces of the object to be detected are exposed to the detection area of ​​the electromagnetic compatibility detection instrument 94, thereby realizing the multi-faceted detection effect of the electromagnetic compatibility detection instrument 94 on the object to be detected, and further improving the electromagnetic compatibility detection performance of the object to be detected. The bottom of the rack plate 107 is fixedly connected to the limiting slide bar 109, and the bottom of the inner cavity of the side frame 11 is provided with a limiting slide groove 1010 that slidably cooperates with the limiting slide bar 109, which plays a role of sliding support for the rack plate 107 that moves back and forth horizontally, thereby improving the displacement stability of the rack plate 107.

[0064] An electromagnetic compatibility testing method, based on an electromagnetic compatibility testing device, comprises the following steps:

[0065] Step 1: First, place the three groups of electrical accessories to be tested on the three groups of placement tables 12 for pre-inspection, and then place the three groups of electrical accessories at the center of the inner side of the positioning head 23 in the three groups of annular rotating frames 20, and rotate the screwing head 22 clockwise, the screwing head 22 drives the threaded rod 21 to move inward, and the threaded rod 21 drives the positioning head 23 to move toward the surface of the electrical accessories, until the three groups of positioning heads 23 tighten and fix the electrical accessories, first control the first group of first electric push rods 65 to open and drive the first driven bevel gear 64 to reach the meshing part of the first drive bevel gear 63, and then control the double-headed motor 61 to start and drive the first group of first driven bevel gears 64 to rotate forward through the first drive bevel gear 63 engaged in place on the rotating shaft 62, the first group of first driven bevel gears 64 drives the long rotating rod 66 to rotate accordingly, and the long rotating rod 66 drives the cam frame 67 to rotate accordingly;

[0066] The second step is to make the first cam frame 67 drive the shielding top cover 73 on the lifting rod 72 to move downward through the pulley frame 71. At this time, the first pulley frame 71 rolls along the edge of the cam frame 67 to its lower dead point, and the lifting rod 72 drives the shielding top cover 73 to move downward and stop in the sealing groove 74 of the stand 2. The shielding bottom cover 75 at the bottom of the stand 2 shields the electrical accessories in the first group of annular rotating frame 20 in the positioning state. At the same time, the shielding top cover 73 that has moved down to the position also drives the T-shaped rod 76 to slide down in the hollow cavity of the support leg 3, and after the reset spring 77 is compressed downward to the position, the double-headed motor 61 is first controlled to pause, and then the first group of first electric push rods 65 are controlled to close and drive the first driven bevel gear 64 to disengage the meshing portion of the first driving bevel gear 63 to the initial state, completing the shielding protection work of the electrical accessories in the positioning state in the annular rotating frame 20 of the first group of stands 2;

[0067] Step 3, then, the sliding opening 84 and the vertical groove 81 play a sliding limit role between the driving circular gear 83 and the rotating shaft 62, first control the second electric push rod 82 to drive the driving circular gear 83 to move down to the meshing part of the three sets of differential circular gears 85, and then control the double-headed motor 61 to restart and drive the three sets of differential circular gears 85 to rotate forward synchronously through the driving circular gear 83 that is meshed in place, and the annular guide rail 16 and the annular sliding end 17 play a rotation support role on the ring gear 86, then the three sets of differential circular gears 85 that rotate forward synchronously drive the ring gear 86 to rotate in the middle cover 14, and the ring gear 86 drives the curved arm 92 to rotate forward, and the sliding notch 18 on the curved arm 92 slides circumferentially on the surface of the middle cover 14;

[0068] Step 4. At the same time, the curved arm 92 drives the blocking frame 93 to rotate forward to the blocking opening 91 on the shielding top cover 73 after the first group is moved down to its position, and the blocking frame 93 blocks the blocking opening 91 on the first group of shielding top covers 73, so that the first group of shielding top covers 73, the stand 2 and the shielding bottom cover 75 form a complete closed shielding space to prevent external electromagnetic radiation and other factors from interfering with the electromagnetic compatibility detection of electrical accessories in the stand 2. At the same time, the position sensor 95 monitors the displacement conversion position of the electromagnetic compatibility detection instrument 94 to the first group of stand 2 in real time, and then the blocking frame 93 after it is in place The electromagnetic compatibility testing instrument 94 performs electromagnetic compatibility testing on the electrical accessories in the first set of annular rotating racks 20 that are in a positioned state. During this period, the electromagnetic compatibility testing screen and the position screen between the electromagnetic compatibility testing instrument 94 and the electrical accessories are tracked and photographed by high-precision cameras 96 that are symmetrically tilted on both sides. The testing personnel can also observe the electromagnetic compatibility testing of the internal electrical accessories through the observation window 15 on the first set of shielding top covers 73. Then, the double-headed motor 61 is controlled to pause, and then the second electric push rod 82 is controlled to close and drive the driving circular gear 83 to move up and disengage the meshing portion of the three sets of differential circular gears 85 to the initial position.

[0069] Step 5: After the electromagnetic compatibility work is completed for the electrical accessories in the positioning state in the first group of stands 2, the corresponding electrical accessories are removed and placed on the placement table 12. Similarly, the blocking frame 93 and the electromagnetic compatibility testing instrument 94 are first synchronously disengaged and rotated to stay between the first group of shielding top covers 73 and the second group of shielding top covers 73, waiting for the second group of shielding top covers 73 to move down and close, until the second group of shielding top covers 73 moves down to the right position, and similarly, the electromagnetic compatibility testing instrument 94 on the blocking frame 93 is blocked on the second group of shielding top covers 73. At the blocking port 91, the electromagnetic compatibility work is performed on the electrical accessories in the second group of racks 2 that are in a positioned state. Similarly, the electromagnetic compatibility work is performed on the electrical accessories in the third group of racks 2 that are in a positioned state. The three groups of first electric push rods 65 can also be controlled to open at the same time, and the three groups of shielding top covers 73 are synchronously moved down and clamped on the rack 2, so that the electromagnetic compatibility testing instrument 94 on the blocking rack 93 reaches the blocking port 91 on the three groups of shielding top covers 73 in turn, and the electromagnetic compatibility work is performed on the electrical accessories in the three groups of racks 2 that are in a positioned state in an orderly manner;

[0070] Step 6: During the period when the electromagnetic compatibility testing instrument 94 performs electromagnetic compatibility testing on electrical accessories, the first electric push rod 65 and the second electric push rod 82 are both in the closed state, and at the same time, the first group of third electric push rods 103 are controlled to open and drive the second driven bevel gear 102 to move inward to the meshing portion of the second driving bevel gear 101, and then the double-headed motor 61 is controlled to open and drive the first group of third electric push rods 103 to rotate through the second driving bevel gear 101 that is meshed in place, and the first group of third electric push rods 103 drive the screw sleeve 105 on the reciprocating screw 104 to move back and forth horizontally, and the limit slide bar 109 and the limit slide groove 1010 provide sliding support for the rack plate 107, and the screw sleeve 105 drives the two groups of rack plates 107 to move back and forth horizontally through the bracket 106;

[0071] Step seven, the two groups of rack plates 107 drive the two groups of driven circular gears 108 in the area of ​​the first group of gantry 2 to rotate forward and reverse synchronously, and the two groups of driven circular gears 108 drive the electrical accessories in the first group of annular rotating rack 20 in the positioning state to rotate forward and reversely through the short rotating rod 19, and then the electromagnetic compatibility work is performed on the electrical accessories in the positioning and forward and reverse rotating states in the first group of gantry 2, and the three groups of third electric push rods 103 can also be controlled to open at the same time, and the driven circular gears 108 drive the electrical accessories in the positioning state in the three groups of annular rotating racks 20 to rotate forward and reverse synchronously through the short rotating rod 19, and then the electrical accessories in the annular rotating racks 20 in the three groups of shielded gantry 2 in the positioning and forward and reverse rotating states are sequentially performed on the blocking ports 91 on the shielding top covers 73 in the closed shielding state.

[0072] It should be noted that the specific models and specifications of the double-headed motor 61, the first electric push rod 65, the second electric push rod 82, the third electric push rod 103, the electromagnetic compatibility testing instrument 94 and the second electric push rod 82 need to be selected and determined according to the actual specifications of the device, and the specific selection and calculation method adopts the existing technology in the field, so it will not be repeated in detail.

[0073] The power supply and principles of the double-headed motor 61, the first electric push rod 65, the second electric push rod 82, the electromagnetic compatibility testing instrument 94, the third electric push rod 103 and the second electric push rod 82, as well as the position sensor 95 and the high-precision camera 96 ​​are clear to those skilled in the art and will not be described in detail here.

[0074] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An electromagnetic compatibility testing device, comprising a base frame (1), characterized in that: The outer side of the bottom frame (1) is fixedly connected to a stand (2), and legs (3) are fixedly connected to the four sides of the bottom of the stand (2); a top frame (4) is arranged above the bottom frame (1), and a side cover (5) is fixedly connected to the outer side of the top frame (4); The inner cavity of the top frame (4) is provided with an adjustment component (6) for use with the side cover (5), and the adjustment component (6) includes a double-headed motor (61) fixed to the top of the bottom frame (1), an output shaft of the double-headed motor (61) is fixedly connected to a rotating shaft (62), and the top of the rotating shaft (62) is fixedly connected to a first driving bevel gear (63), first driven bevel gears (64) are arranged around the top of the first driving bevel gear (63), and the outer side of the first driven bevel gear (64) is fixedly connected to a first electric push rod (65), the outer side of the first electric push rod (65) is sleeved with a long rotating rod (66), and the side of the long rotating rod (66) away from the first driven bevel gear (64) is fixedly connected to a cam frame (67) for use with the side cover (5), and the adjustment component (6) is close to the side cover The bottom of the support frame (5) is provided with a shielding assembly (7) for use with the support frame (2), the shielding assembly (7) includes a pulley frame (71) rolling on the cam frame (67), and the bottom of the pulley frame (71) is fixedly connected to a lifting rod (72), the bottom of the lifting rod (72) passes through the side cover (5) and is fixedly connected to a shielding top cover (73), and the top of the support frame (2) is provided with a sealing groove (74) for engaging with the shielding top cover (73), the bottom of the support frame (2) is fixedly connected to a shielding bottom cover (75) for use with the shielding top cover (73), and the shielding top cover (73) is fixedly connected to a T-shaped rod (76) for slidingly engaging with the support frame (2) and the support leg (3) on all sides, and the bottom of the T-shaped rod (76) is fixedly connected to a return spring (77) for fixedly engaging with the support leg (3); A transposition component (8) and a detection component (9) for use with the shielding component (7) and the stand (2) are respectively arranged on one side of the adjustment component (6), the transposition component (8) comprising a vertical groove (81) provided at the bottom of the rotating shaft (62), and a second electric push rod (82) is embedded at the bottom of the inner cavity of the rotating shaft (62), the piston rod of the second electric push rod (82) is fixedly connected to a driving circular gear (83) that is slidably matched with the rotating shaft (62), and a sliding opening (84) that is slidably matched with the vertical groove (81) is provided on the driving circular gear (83) near the rotating shaft (62), and a differential circular gear (85) is provided on the periphery of the driving circular gear (83), and a gear ring (86) is meshed on the outer side of the differential circular gear (85). ), the detection component (9) comprises a sealing opening (91) opened on the inner side of the shielding top cover (73), and a bent arm (92) is fixedly connected to one side of the gear ring (86), a sealing frame (93) that is snap-fitted with the sealing opening (91) is fixedly connected to the side of the bent arm (92) away from the gear ring (86), and an electromagnetic compatibility detection instrument (94) used in conjunction with the stand (2) is fixedly connected to the inner side of the sealing frame (93), a position sensor (95) is fixedly connected to the top of the electromagnetic compatibility detection instrument (94), and high-precision cameras (96) are fixedly connected to both sides of the bottom of the electromagnetic compatibility detection instrument (94), and the high-precision cameras (96) are distributed in a symmetrically inclined state along the central axis of the electromagnetic compatibility detection instrument (94).

2. The electromagnetic compatibility detection device according to claim 1, characterized in that: Both sides of the platform (2) are fixedly connected to side frames (11), and the side frames (11) are fixedly connected to the outer sides of the platform (2) to the placement platform (12), and the side frames (11) are fixedly connected to the side of the placement platform (12) to the upright column (13), and the bottom of the top frame (4) is fixedly connected to a middle cover (14) that is rotatably matched with the rotating shaft (62) and the differential circular gear (85) via a connecting piece.

3. An electromagnetic compatibility detection device according to claim 2, characterized in that: An observation window (15) is provided on the outer side of the shielding top cover (73), and the inner wall of the observation window (15) is embedded with tempered glass, and the outer surface of the tempered glass is sprayed with transparent shielding paint. The inner cavity of the middle cover (14) is provided with an annular guide rail (16), and the inner cavity of the annular guide rail (16) is rotatably connected to an annular sliding end (17) fixedly matched with the gear ring (86).

4. The electromagnetic compatibility detection device according to claim 3, characterized in that: The top of the outer side of the bent arm (92) is provided with a sliding recess (18) that is slidably matched with the middle cover (14), and short rotating rods (19) that are rotatably matched with the side frames (11) are rotatably connected to both sides of the inner cavity of the stand (2), and the inner side of the short rotating rod (19) is fixedly connected with an annular rotating frame (20) that is used in conjunction with the shielding top cover (73) and the shielding bottom cover (75).

5. The electromagnetic compatibility detection device according to claim 4, characterized in that: Threaded rods (21) are threadedly connected to both sides of the annular rotating frame (20), and screwing heads (22) are fixedly connected to the outer sides of the threaded rods (21). Anti-slip grooves are provided around the screwing heads (22), and a positioning head (23) for use with the annular rotating frame (20) is provided on the inner side of the threaded rods (21).

6. An electromagnetic compatibility testing method, according to the electromagnetic compatibility testing device of claim 5, characterized in that: The steps include: Step 1: First, the three sets of electrical accessories to be inspected are placed on three sets of placement tables (12) for pre-inspection, and then the three sets of electrical accessories are placed at the center of the inner side of the positioning head (23) in the three sets of circular rotating racks (20), and the screwing head (22) is rotated clockwise, the screwing head (22) drives the threaded rod (21) to move inward, and the threaded rod (21) drives the positioning head (23) to move toward the surface of the electrical accessories until the three sets of positioning heads (23) tighten and fix the electrical accessories. , firstly control the first group of first electric push rods (65) to start and drive the first driven bevel gear (64) to reach the meshing portion of the first driving bevel gear (63), then control the double-headed motor (61) to start and drive the first group of first driven bevel gears (64) to rotate in the forward direction through the first driving bevel gear (63) meshed in place on the rotating shaft (62), the first group of first driven bevel gears (64) drive the long rotating rod (66) to rotate accordingly, and the long rotating rod (66) drives the cam frame (67) to rotate accordingly; Step 2: Next, the first cam frame (67) drives the shielding top cover (73) on the lifting rod (72) to move downward through the pulley frame (71). At this time, the first pulley frame (71) rolls along the edge of the cam frame (67) to its lower stop point, and the lifting rod (72) drives the shielding top cover (73) to move downward and stop in the sealing groove (74) of the stand (2). The shielding bottom cover (75) at the bottom of the stand (2) shields and protects the electrical accessories in the first annular rotating frame (20) in a positioned state. At the same time, the shielding top cover (73) that has moved down into position also drives the T-shaped rod (76) to slide down in the hollow cavity of the support leg (3), and after the return spring (77) is compressed downward into position, the double-headed motor (61) is first controlled to pause, and then the first electric push rod (65) of the first group is controlled to close and drive the first driven bevel gear (64) to disengage from the meshing portion of the first driving bevel gear (63) to the initial state, thereby completing the shielding protection work of the electrical accessories in the positioning state in the annular rotating frame (20) of the first group of gantry (2); Step 3, then, the sliding opening (84) and the vertical groove (81) play a sliding limit fit between the driving circular gear (83) and the rotating shaft (62), first control the second electric push rod (82) to drive the driving circular gear (83) to move down to the meshing portion of the three sets of differential circular gears (85), and then control the double-headed motor (61) to restart and drive the three sets of differential circular gears (85) to rotate synchronously in the positive direction through the meshing driving circular gear (83), and the annular guide rail (16) and the annular sliding end (17) play a rotation support role on the ring gear (86), then the three sets of differential circular gears (85) that rotate synchronously in the positive direction drive the ring gear (86) to rotate in the middle cover (14), and the ring gear (86) drives the bent arm (92) to rotate in the positive direction, while the sliding notch (18) on the bent arm (92) slides circumferentially on the surface of the middle cover (14); Step 4: At the same time, the curved arm (92) drives the blocking frame (93) to rotate forward to the blocking opening (91) on the shielding top cover (73) after the first group is moved down to the position, and the blocking frame (93) blocks the blocking opening (91) on the first group of shielding top covers (73), so that the first group of shielding top covers (73), the stand (2) and the shielding bottom cover (75) form a complete closed shielding space to prevent external electromagnetic radiation and other factors from interfering with the electromagnetic compatibility detection of the electrical accessories in the stand (2). At the same time, the position sensor (95) monitors the displacement conversion position of the electromagnetic compatibility detection instrument (94) reaching the first group of stands (2) in real time, and then the blocking frame (93) is followed. ) After the electromagnetic compatibility testing instrument (94) is in place, the electromagnetic compatibility testing operation is performed on the electrical accessories in the first set of annular rotating frames (20) in a positioned state. During this period, the electromagnetic compatibility testing screen and the position screen between the electromagnetic compatibility testing instrument (94) and the electrical accessories are tracked and photographed by high-precision cameras (96) symmetrically tilted on both sides. The testing personnel can also observe the electromagnetic compatibility testing status of the internal electrical accessories through the observation window (15) on the first set of shielding top cover (73). After that, the double-headed motor (61) is first controlled to pause, and then the second electric push rod (82) is controlled to close and drive the driving circular gear (83) to move up and disengage the meshing portion of the three sets of differential circular gears (85) to the initial position; Step 5: After the electromagnetic compatibility test is completed for the electrical accessories in the first set of stands (2) that are in the positioning state, the corresponding accessories are removed and placed on the placement table (12). Similarly, the blocking frame (93) and the electromagnetic compatibility testing instrument (94) are first synchronously disengaged and rotated to a position between the first set of shielding top covers (73) and the second set of shielding top covers (73), and the second set of shielding top covers (73) are stopped, waiting for the second set of shielding top covers (73) to move down and close, until the second set of shielding top covers (73) are moved down to the position, and then the electromagnetic compatibility testing instrument (94) on the blocking frame (93) is blocked on the second set of shielding top covers (73). The electromagnetic compatibility test is performed on the electrical accessories in the second set of racks (2) in a positioned state at the blocking opening (91). Similarly, the electromagnetic compatibility test is performed on the electrical accessories in the third set of racks (2) in a positioned state. The three sets of first electric push rods (65) can also be controlled to open simultaneously, and the three sets of shielding top covers (73) can be synchronously moved down and clamped on the racks (2), so that the electromagnetic compatibility test instruments (94) on the blocking racks (93) can sequentially reach the blocking openings (91) on the three sets of shielding top covers (73), and the electromagnetic compatibility test is performed on the electrical accessories in the three sets of racks (2) in a positioned state in an orderly manner.

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