Magnetic force test equipment of wireless charging device

By employing a mechanical positioning method in the magnetic force testing equipment for wireless charging devices, and utilizing the cooperation of centering holes and centering rods, the problems of complex sensor system structure and high cost are solved, thereby simplifying the equipment and reducing costs, while improving the accuracy and efficiency of testing.

CN224034817UActive Publication Date: 2026-03-24SHENZHEN STARPRECISE ROBOTICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-31
Publication Date
2026-03-24

AI Technical Summary

Technical Problem

In existing magnetic force testing equipment for wireless charging devices, the sensor system structure is complex and the cost is high.

Method used

A mechanical positioning method is adopted, and alignment is achieved through the centering structure on the first and second carriers. The centering process is simplified and the equipment cost is reduced by utilizing the cooperation of the centering hole and the centering rod.

Benefits of technology

The resulting magnetic testing equipment for wireless charging devices is simple in structure, low in cost, and improves the accuracy and efficiency of testing.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to magnetic force testing equipment of a wireless charging device. The magnetic force testing equipment comprises a machine main body, a first carrier and a second carrier, the first carrier and the second carrier are arranged on the machine body in a spaced mode in the first direction, and at least one of the first carrier and the second carrier can move in the first direction so as to be close to or away from the other carrier; the first carrier is provided with a first mounting position, the second carrier is provided with a second mounting position, one of the first mounting position and the second mounting position is used for placing a wireless charging device, and the other one of the first mounting position and the second mounting position is used for placing a to-be-charged device; the first carrier is provided with a first centering structure, the second carrier is provided with a second centering structure, and the first centering part can be matched with the second centering part so that the first installation position can directly face the second installation position. The device has the advantages of being simple in structure and low in cost.
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Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wireless charging test devices, and relates to a magnetic force test equipment for a wireless charging device. BACKGROUND

[0002] With the development of wireless technology and the popularization of wireless power transmission technology, wireless charging devices have been applied to many products.

[0003] The existing magnetic pull test equipment charging device is aligned with the center of the device to be charged to ensure effective coupling of the magnetic field and test accuracy. The common alignment method is generally a combination of a sensor feedback system and a laser positioning system. A Hall sensor, a proximity sensor or a displacement sensor is installed on the device. Then, according to the output data of the sensor, a laser emitter projects a light beam to the center mark of the receiving device. When the results of the two systems indicate alignment, the test begins.

[0004] The existing sensor system has a complex structure and high cost. SUMMARY

[0005] The technical problem to be solved by the application is to provide a magnetic force test equipment for a wireless charging device to solve the problem of complex structure and high cost of the existing sensor system.

[0006] To solve the above technical problems, the application provides a magnetic force test equipment for a wireless charging device, which comprises a main body, a first carrier and a second carrier.

[0007] The first carrier and the second carrier are arranged on the main body in a first direction, and at least one of the first carrier and the second carrier can move in the first direction to approach or move away from the other.

[0008] The first carrier is provided with a first mounting position, and the second carrier is provided with a second mounting position. One of the first mounting position and the second mounting position is used to place a wireless charging device, and the other is used to place a device to be charged.

[0009] The first carrier is provided with a first centering structure, and the second carrier is provided with a second centering structure. The first centering structure can cooperate with the second centering structure to make the first mounting position and the second mounting position opposite.

[0010] Optionally, the first centering structure is a first centering hole, the second centering structure is a second centering hole, and the first centering hole and the second centering hole can cooperate with a centering rod to make the first mounting position and the second mounting position opposite.

[0011] Optionally, the first pair of middle holes are through holes extending along the first direction; and the second pair of middle holes are through holes extending along the first direction.

[0012] Optionally, the machine body has a mounting plane.

[0013] The first carrier comprises a first linear module, a bearing member and a support member, the support member is fixed to the mounting plane, the first linear module is arranged on the support member, and the bearing member is connected to the first linear module, and a sliding direction of the bearing member is parallel to the first direction.

[0014] The first mounting position is arranged on the bearing member, and the first mounting position is used for placing the device to be charged.

[0015] Optionally, the machine body has a mounting plane, and the second linear module is arranged on the mounting plane.

[0016] The third linear module is connected to the second linear module, so that the second linear module can drive the third linear module to displace along a second direction; and the second carrier is connected to the third linear module, so that the third linear module can drive the second carrier to displace along a third direction.

[0017] The first direction, the second direction and the third direction are perpendicular to each other.

[0018] Optionally, the machine body has a mounting plane, and the second linear module is arranged on the mounting plane.

[0019] Optionally, the second carrier comprises a first base plate, a first jig seat and a jaw assembly, the first base plate is detachably connected to the mounting plate, the jaw assembly and the first jig seat are arranged on the first base plate, the first jig seat is provided with a first accommodation groove and at least two avoiding grooves, the avoiding grooves are communicated with the first accommodation groove, the first accommodation groove is used for accommodating the wireless charging device, and the second pair of middle holes are arranged at the bottom of the first accommodation groove.

[0020] The jaw assembly comprises at least two jaws and a power assembly, the avoiding grooves and the jaws are in one-to-one correspondence, each jaw is arranged in the avoiding groove, and the power assembly is used for driving the jaws to clamp or release the wireless charging device in the first accommodation groove.

[0021] Optionally, the first carrier is provided with two first carriers, the two first carriers are arranged on the first linear module in a second direction, one of the first carriers is used for placing a first to-be-charged device, and the other first carrier is used for placing a second to-be-charged device, the first to-be-charged device and the second to-be-charged device are different in type.

[0022] The second carrier comprises a second base plate, a second jig seat and a clamp assembly, and the second base plate is detachably connected with the mounting plate.

[0023] The clamp assembly and the second jig seat are arranged on the second base plate, the second jig seat is provided with a second placement groove and a third placement groove, the second placement groove is used for accommodating a charging part of a wireless charging device corresponding to the first to-be-charged device, and the third placement groove is used for accommodating a charging part of the wireless charging device corresponding to the second to-be-charged device.

[0024] The clamp assembly is used for temporarily fixing the base of the wireless charging device.

[0025] Optionally, the second carrier further comprises a rotating shaft and a rotating seat, the rotating seat is fixed to the second base plate, the rotating shaft is rotationally connected to the rotating seat, and the second jig seat is fixed to the rotating shaft, so that the second jig seat rotates relative to the rotating seat.

[0026] Optionally, the opening direction of the second placement groove is different from the opening direction of the third placement groove, and a second pair of centering holes are arranged on the bottom walls of the second placement groove and the third placement groove respectively, and the axes of the second pair of centering holes in the second placement groove and the second pair of centering holes in the third placement groove are different in surface.

[0027] The magnetic force test equipment for the wireless charging device disclosed in the application has the advantages of simple structure and low cost through the mechanical cooperation between the first centering part and the second centering part. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the overall appearance of the magnetic force test equipment provided by an embodiment of the application;

[0029] Figure 2 is a schematic diagram of the positions of the first carrier and the second carrier of the magnetic force test equipment provided by an embodiment of the application;

[0030] Figure 3 is a schematic diagram of the mounting plane, the first carrier and the second carrier of the magnetic force test equipment provided by an embodiment of the application;

[0031] Figure 4is a bottom structure schematic view of a first carrier of a magnetic force testing device provided by an embodiment of the present application;

[0032] Figure 5 is a schematic view of a second carrier of a magnetic force testing device provided by an embodiment of the present application without a charging part;

[0033] Figure 6 is a schematic view of a second carrier of a magnetic force testing device provided by an embodiment of the present application with a charging part;

[0034] Figure 7 is a first perspective schematic view of a second carrier of a magnetic force testing device provided by an embodiment of the present application

[0035] Figure 8 is a second perspective schematic view of a second carrier of a magnetic force testing device provided by an embodiment of the present application.

[0036] The reference signs in the specification are as follows:

[0037] 1, machine body; 11, mounting plane; 2, first carrier; 21, support; 22, first linear module; 23, bearing piece; 24, sensor; 25, first centering hole; 3, second carrier; 3, second centering hole; 31, first base plate; 32, first jig seat; 33, clamping jaw assembly; 331, power assembly; 332, clamping jaw; 34, second base plate; 35, second jig seat; 351, first mounting groove; 352, second mounting groove; 36, clamp assembly; 361, power piece; 362, bracket; 363, roller; 37, rotating shaft; 38, rotating seat; 39, driving motor; 4, second linear module; 5, third linear module; 6, mounting plate; 9, wireless charging device; 91, charging part; 92, base; 93, mobile phone charging part; 94, watch charging part. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects solved by the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0039] Reference is made to Figures 1 to 8The application provides a magnetic force testing device of a wireless charging device, which comprises a machine body 1, a first carrier 2 and a second carrier 3. The first carrier 2 and the second carrier 3 are arranged on the machine body 1 in a first direction, and at least one of the first carrier 2 and the second carrier 3 can move in the first direction to approach or move away from the other. The first carrier 2 is provided with a first mounting position, and the second carrier 3 is provided with a second mounting position, one of the first mounting position and the second mounting position is used for placing the wireless charging device 9, and the other is used for placing a device to be charged; the first carrier 2 is provided with a first centering structure, and the second carrier 3 is provided with a second centering structure, and the first centering structure can cooperate with the second centering structure to make the first mounting position and the second mounting position opposite.

[0040] In the embodiment, the mechanical positioning has the advantages of simple structure and low cost compared with the sensor 24 and laser positioning in the prior art.

[0041] The first direction is the up-down direction of the magnetic force testing device of the wireless charging device. In the industry, the position of the second carrier 3 is generally fixed, and the position of the first carrier 2 can be moved up and down to approach or move away from the second carrier 3.

[0042] Reference Figures 2 to 5 Specifically, the first centering structure is a first centering hole 25, the second centering structure is a second centering hole 30, and the first centering hole 25 and the second centering hole 30 can cooperate with a centering rod to make the first mounting position and the second mounting position opposite. The hole diameters of the first centering hole 25 and the second centering hole 30 in the embodiment are the same.

[0043] In the embodiment, when the first centering hole 25 and the second centering hole 30 are coaxial, the centering rod can be inserted into the first centering hole 25 and the second centering hole 30 at the same time, and vice versa. If the first centering hole 25 and the second centering hole 30 are not coaxial, the centering rod cannot be inserted into the first centering hole 25 and the second centering hole 30, which indicates that the two carriers are not aligned and the position needs to be adjusted. The position is adjusted to the position where the centering rod can be inserted into the first centering hole 25 and the second centering hole 30. The centering rod is inserted into the first centering hole 25 and the second centering hole 30 before testing and during centering. After the centering is completed, the centering rod is pulled out of the first centering hole 25 and the second centering hole 30 to avoid affecting the installation of the charging device and the device to be charged.

[0044] The wireless charging device 9 in the embodiment is a wireless charging base 92, and the device to be charged is a smart phone and / or a smart watch.

[0045] As an example, the first centering hole 25 is a through hole extending in the first direction, and the second centering hole 30 is a through hole extending in the first direction. After the centers of the first mounting position and the second mounting position are aligned, the centering rod is inserted into the second centering hole 30 from the first centering hole 25.

[0046] In other embodiments, one of the first pair of holes 25 and the second pair of holes 30 is a through hole, and the other is a blind hole. For example, the first pair of holes 25 is a through hole, and the second pair of holes 30 is a blind hole. The centering rod is inserted into the second pair of holes 30 from top to bottom, and is pulled out upwardly. If the first pair of holes 25 is a blind hole, and the second pair of holes 30 is a through hole, the centering rod is inserted into the second pair of holes 30 from bottom to top.

[0047] In other embodiments, the first pair of holes 25 and the second pair of holes 30 are both blind holes. To center, the centering rod is placed in one of the first pair of holes 25 and the second pair of holes 30, so that the first carrier 2 is close to the second carrier 3. During the close process, it is observed that the centering rod can be inserted into the other of the first pair of holes 25 and the second pair of holes 30.

[0048] Referring to Figures 2 to 4 As an example, the machine body 1 has a mounting plane 11; the first carrier 2 includes a first linear module 22, a bearing 23, and a support 21. The support 21 is fixed to the mounting plane 11. The first linear module 22 is arranged on the support 21. The bearing 23 is connected with the first linear module 22. The sliding direction of the bearing 23 is parallel to the first direction. A first mounting position is arranged on the bearing 23, and is used for placing a device to be charged. In this embodiment, the bearing 23 is fixed on the mounting plane 11. The bearing 23 extends upwardly. The first linear module 22 is arranged on the bearing 23. Then, the bearing 23 is mounted on the first linear module 22.

[0049] A sensor 24 is arranged on the first carrier 2. A base 92 of the sensor 24 is mounted on the first linear module 22. A sensing end of the sensor 24 is connected with the bearing 23.

[0050] Before testing, the device to be charged is first arranged in the bearing 23. The first linear module 22 is started to drive the bearing 23 to approach or move away from the second carrier 3. The sensor 24 can sense the force applied by the second carrier 3 to the device to be charged. Thus, the test result of the magnetic force of the wireless charging device 9 can be obtained.

[0051] Referring to Figure 3As an example, the second linear module 4 is arranged on the mounting plane 11, and the third linear module 5 is connected with the second linear module 4 to enable the second linear module 4 to drive the third linear module 5 to displace along the second direction, and the second carrier 3 is connected with the third linear module 5 to enable the third linear module 5 to drive the second carrier 3 to displace along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. The first linear module 22, the second linear module 4 and the third linear module 5 in the embodiment are any one of common linear displacement devices such as a linear motor module, a synchronous belt linear module and a ball screw linear module. One of the second direction and the third direction is a front-rear direction of the magnetic force testing equipment of the wireless charging device, and the other is a left-right direction of the magnetic force testing equipment of the wireless charging device.

[0052] With reference to Figure 3 As an example, the mounting plate 6 is arranged on the third linear module 5, and the second carrier 3 is detachably connected with the mounting plate 6. The mounting plate 6 is provided with a plurality of bolt holes, and the second carrier 3 is fixed on the mounting plate 6 by bolts to realize the detachable connection of the second carrier 3. As described below, the second carrier 3 in the embodiment is at least two types, and a plurality of different second carriers 3 are connected with the third linear module 5 through detachable connection, thereby improving the application range of the magnetic force testing equipment of the wireless charging device.

[0053] With reference to Figure 5 and Figure 6 In an embodiment, the second carrier 3 includes a first base plate 31, a first jig seat 32 and a jaw 332 assembly 33. The first base plate 31 is detachably connected with the mounting plate 6, the jaw 332 assembly 33 and the first jig seat 32 are arranged on the first base plate 31, the first jig seat 32 is provided with a first accommodating groove 351 and at least two avoiding grooves, the avoiding grooves are communicated with the first accommodating groove 351, the first accommodating groove 351 is used for accommodating the wireless charging device 9, and the second centering hole 30 is arranged at the bottom of the first accommodating groove 351.

[0054] The jaw 332 assembly 33 includes at least two jaws 332 and a power assembly 331. The avoiding grooves and the jaws 332 are in one-to-one correspondence, each jaw 332 is arranged in an avoiding groove, and the power assembly 331 is used for driving the jaws 332 to clamp or release the wireless charging device 9 in the first accommodating groove 351.

[0055] In the embodiment, the first substrate 31 is provided with a plurality of bolt holes, and the plurality of bolt holes on the first substrate 31 correspond to the plurality of bolt holes on the mounting plate 6 one by one, and the two are detachably connected by bolts. The first jig seat 32 is provided with only one first placement groove 351, and the first placement groove 351 places the wireless charging device 9 corresponding to the mobile phone or the wireless charging device 9 corresponding to the watch. The shape and depth of the first placement groove 351 are designed according to the size of the wireless charging device 9 placed. The wireless charging device 9 placed in the first placement groove 351 is fixed by using the claw 332 assembly 33 to avoid the wireless charging device 9 from being separated from the first placement groove 351 due to magnetic force during the test process. The claw 332 of the claw 332 assembly 33 is generally elastic to avoid scratching the wireless charging device 9. The power assembly 331 selects a pneumatic finger, and the claw 332 is fixed on the finger of the power assembly 331.

[0056] Referring to Figure 3 and Figure 4 In an embodiment, two first carriers 2 are provided, and the two first carriers 2 are arranged on the first linear module 22 along the second direction. One of the two first carriers 2 is used for placing a first to-be-charged device, and the other first carrier 2 is used for placing a second to-be-charged device. The first to-be-charged device and the second to-be-charged device are different in type.

[0057] In the embodiment, one of the first carriers 2 is used for placing a smart phone (the first to-be-charged device), and the other first carrier 2 is used for placing a smart watch (the second to-be-charged device).

[0058] Referring to Figure 7 and Figure 8 The second carrier 3 includes a second substrate 34, a second jig seat 35, and a clamp assembly 36. The second substrate 34 is detachably connected with the mounting plate 6. The clamp assembly 36 and the second jig seat 35 are arranged on the second substrate 34. The second jig seat 35 is provided with a second placement groove 352 and a third placement groove. The second placement groove 352 is used for containing a charging part 91 of the wireless charging device 9 corresponding to the first to-be-charged device, and the third placement groove is used for containing a charging part 91 of the wireless charging device 9 corresponding to the second to-be-charged device.

[0059] The wireless charging device 9 in the embodiment includes a base 92, a mobile phone charging part 93, and a watch charging part 94. The wireless charging device 9 can simultaneously charge a mobile phone and a watch. The second jig seat 35 is provided with a second placement groove 352 and a third placement groove. The second placement groove 352 corresponds to the first carrier 2 for placing a mobile phone, and the third placement groove corresponds to the first carrier 2 for placing a watch.

[0060] The clamp assembly 36 is used to temporarily fix the base 92 of the wireless charging device 9. When testing, the base 92 of the wireless charging device 9 is fixed by the clamp assembly 36, so as to indirectly fix the two charging parts 91 of the wireless charging device 9. The clamp assembly 36 comprises a power member 361 and a pressing member, the pressing member comprising a bracket 362 and a roller 363, the bracket 362 being connected with the power member 361, and the roller 363 being arranged at an end of the bracket 362 away from the power member 361. The roller 363 can press the base 92 against the second jig seat 35 under the action of the power member 361.

[0061] As an example, the second carrier 3 further comprises a rotating shaft 37 and a rotating seat 38, the rotating seat 38 being fixed to the second base plate 34, and the rotating shaft 37 being rotatably connected to the rotating seat 38. The second jig seat 35 is fixed to the rotating shaft 37, so that the second jig seat 35 rotates with the rotating shaft 37 relative to the rotating seat 38. In the embodiment, the rotating shaft 37 and the rotating seat 38 can drive the second jig seat 35 to rotate together around the axis of the rotating shaft 37, so that the charging part 91 of the wireless charging device 9 on the second jig seat 35 can rotate. The rotating shaft 37 is connected with a driving motor 39, and the driving motor 39 is a servo motor. The driving motor 39 drives the rotating shaft 37 to rotate.

[0062] As an example, the opening direction of the second accommodating groove 352 is different from the opening direction of the third accommodating groove, and a second centering hole 30 is arranged on the bottom wall of the second accommodating groove 352 and the third accommodating groove respectively. The axis of the second centering hole 30 located in the second accommodating groove 352 is out of plane with the axis of the second centering hole 30 located in the third accommodating groove.

[0063] The opening direction of the end of the second centering hole 30 close to the second accommodating groove 352 is the same as the opening direction of the second accommodating groove 352, and the opening direction of the end of the second centering hole 30 close to the third accommodating groove is the same as the opening direction of the third accommodating groove. In combination with the rotating shaft 37 and the rotating seat 38 described above, when testing the magnetic force between the mobile phone charging part 93 of the wireless charging device 9 and the mobile phone, the centers of the mobile phone on the first carrier 2 and the mobile phone charging part 93 of the wireless charging device 9 are directly opposite. When testing the magnetic force between the watch charging part 94 of the wireless charging device 9 and the watch, the centers of the watch on the first carrier 2 and the watch charging part 94 of the wireless charging device 9 are directly opposite, which can be suitable for the wireless charging device 9 on the market which can charge the watch and the mobile phone. The above is only a preferred embodiment of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A magnetic force testing device for a wireless charging device, characterized in that, Includes the main body of the aircraft, the first vehicle, and the second vehicle; The first vehicle and the second vehicle are spaced apart on the main body along a first direction, and at least one of the first vehicle and the second vehicle is capable of moving along the first direction to move closer to or further away from the other. The first vehicle is provided with a first mounting position, and the second vehicle is provided with a second mounting position. One of the first mounting position and the second mounting position is used to place a wireless charging device, and the other is used to place a device to be charged. The first carrier is provided with a first centering structure, and the second carrier is provided with a second centering structure. The first centering component can cooperate with the second centering component to make the first mounting position and the second mounting position face each other.

2. The magnetic force testing device for the wireless charging device according to claim 1, characterized in that, The first centering structure is a first centering hole; the second centering structure is a second centering hole; the first centering hole and the second centering hole can be fitted with a centering rod so that the first mounting position and the second mounting position are aligned.

3. The magnetic force testing device for the wireless charging device according to claim 2, characterized in that, The first pair of center holes are through holes extending along the first direction; the second pair of center holes are through holes extending along the first direction.

4. The magnetic force testing device for the wireless charging device according to claim 2, characterized in that, The main body of the machine has a mounting surface; The first carrier includes a first linear module, a carrier, and a support. The support is fixed to the mounting plane, the first linear module is disposed on the support, the carrier is connected to the first linear module, and the sliding direction of the carrier is parallel to the first direction. The first mounting position is disposed on the carrier and is used to place the device to be charged.

5. The magnetic force testing device for the wireless charging device according to claim 4, characterized in that, It also includes a second linear module and a third linear module; the main body has a mounting plane, and the second linear module is disposed on the mounting plane; The third linear module is connected to the second linear module so that the second linear module can drive the third linear module to move along the second direction; the second vehicle is connected to the third linear module so that the third linear module can drive the second vehicle to move along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

6. The magnetic force testing device for the wireless charging device according to claim 5, characterized in that, It also includes a mounting plate, which is disposed on the third linear module; the second carrier is detachably connected to the mounting plate.

7. The magnetic force testing device for the wireless charging device according to claim 6, characterized in that, The second carrier includes a first base plate, a first fixture seat, and a gripper assembly. The first base plate is detachably connected to the mounting plate. The gripper assembly and the first fixture seat are both disposed on the first base plate. The first fixture seat is provided with a first placement groove and at least two clearance grooves. The clearance grooves communicate with the first placement groove. The first placement groove is used to accommodate the wireless charging device. The second centering hole is disposed at the bottom of the first placement groove. The gripper assembly includes at least two grippers and a power component. The clearance slots and grippers correspond one-to-one, with each gripper disposed in a clearance slot. The power component is used to drive the grippers to clamp or release the wireless charging device located in the first placement slot.

8. The magnetic force testing device for the wireless charging device according to claim 6, characterized in that, There are two first carriers, which are spaced apart on the first linear module along the second direction. One first carrier is used to house the first device to be charged, and the other first carrier is used to house the second device to be charged. The first device to be charged and the second device to be charged are of different types. The second carrier includes a second base plate, a second fixture seat, and a clamping assembly, wherein the second base plate is detachably connected to the mounting plate; The clamping assembly and the second fixture base are both disposed on the second base plate. The second fixture base is provided with a second placement groove and a third placement groove. The second placement groove is used to accommodate the charging part of the wireless charging device corresponding to the first device to be charged, and the third placement groove is used to accommodate the charging part of the wireless charging device corresponding to the second device to be charged. The clamp assembly is used to temporarily secure the base of the wireless charging device.

9. The magnetic force testing device for the wireless charging device according to claim 8, characterized in that, The second carrier further includes a rotating shaft and a rotating seat. The rotating seat is fixed to the second base plate, the rotating shaft is rotatably connected to the rotating seat, and the second fixture seat is fixed to the rotating shaft so that the second fixture seat rotates relative to the rotating seat with the rotating shaft.

10. The magnetic force testing device for the wireless charging device according to claim 8, characterized in that, The opening orientation of the second placement groove is different from that of the third placement groove. A second centering hole is provided on the bottom wall of the second placement groove and the bottom wall of the third placement groove, respectively. The axis of the second centering hole located in the second placement groove is opposite to the axis of the second centering hole located in the second placement groove of the third placement groove.