Test box for mobile phone electromagnetic compatibility test

Abstract

The utility model belongs to the technical field of mobile phone electromagnetic compatibility test, and particularly relates to a test box for mobile phone electromagnetic compatibility test, which comprises a test box body, a sealing door rotatably mounted on the front side of the test box body, a base fixedly mounted in the test box body, and a motor fixedly mounted in the base. An output shaft of the motor penetrates through the base and is fixedly provided with a rotating column, a rotating groove is formed in the rotating column, a sliding column is slidably installed in the rotating groove, a plurality of threaded rods are rotatably installed in the rotating groove and located below the sliding column, the upper ends of the threaded rods extend into the sliding column, and the threaded rods are in threaded connection with the sliding column; according to the intelligent illuminating lamp with the fire detection and alarm functions, the angle of the detected mobile phone can be conveniently adjusted by a worker, the operation is convenient and rapid, the height of the detected mobile phone can be conveniently adjusted by the worker, and in the process of adjusting the degree of the intelligent illuminating lamp with the fire detection and alarm functions, the detected mobile phone is relatively stable in displacement and does not shake or fall off.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic compatibility testing technology for mobile phones, and particularly relates to a test box for electromagnetic compatibility testing of mobile phones. Background Technology

[0002] Mobile phone electromagnetic compatibility testing is a series of tests that evaluate a mobile phone's ability to work in coordination with other devices in an electromagnetic environment, as well as its ability to resist external electromagnetic interference. This test aims to ensure that the mobile phone will not interfere with other electronic devices during normal use, and will not affect its normal function due to external electromagnetic interference.

[0003] For example, Chinese patent CN209030274U discloses a test chamber for electromagnetic compatibility testing of mobile phones, including a chamber body, handle, display screen, charging port, and USB port. A rotating platform is also provided on the bottom surface inside the test chamber, on which a mobile phone base is fixed. The rotating platform is connected to a motor, and a receiving antenna is provided on the inner wall of the test chamber. The test chamber is also equipped with a corresponding control system, which is located between the inner wall of the chamber and the shielding steel plate of the chamber body. The control system includes a filter, a central processing module, and a data transmission module. The data transmission module is connected to the central processing module and the USB port. The receiving antenna, the motor, and the display screen are connected to the central processing module. This utility model is specifically designed for mobile phone use, featuring small size and ease of use. In the mobile phone industry, it replaces anechoic chambers, saving testing costs and avoiding the cost of constructing anechoic chambers, demonstrating good practicality.

[0004] The aforementioned patent has the following problems:

[0005] This patent has some drawbacks in its use, such as: when conducting electromagnetic compatibility (EMC) tests on mobile phones, the phone holder can only fix one type of phone, and cannot fix phones of different sizes, resulting in a limited range of applicability. Furthermore, in mobile phone EMC testing, the phone needs to be rotated for omnidirectional testing, but the aforementioned device cannot adjust the angle of the phone under test, leading to incomplete test results. Therefore, we propose a test chamber for mobile phone EMC testing. Utility Model Content

[0006] The purpose of this invention is to provide a test box for electromagnetic compatibility testing of mobile phones, so as to solve the problems mentioned in the background art.

[0007] In view of this, the present invention provides a test chamber for electromagnetic compatibility testing of mobile phones, comprising:

[0008] The test chamber body has a sealing door rotatably installed on the front side of the test chamber body, a base is fixedly installed inside the test chamber body, a motor is fixedly installed inside the base, the output shaft of the motor passes through the base and a rotating column is fixedly installed thereon, a rotating groove is opened in the rotating column, a sliding column is slidably installed in the rotating groove, and several threaded rods are rotatably installed in the rotating groove and below the sliding column, the upper ends of the several threaded rods extend into the sliding column, and the several threaded rods are threadedly connected to the sliding column.

[0009] A drive assembly, located within a rotating column, is used to drive a plurality of threaded rods to rotate.

[0010] A fixing strip is fixedly installed on the top of the sliding column. The top of the fixing strip is symmetrically provided with sliding grooves. Sliding rods are slidably installed in both sliding grooves. Several tension springs that are fixed to the inner wall of the corresponding sliding groove are fixedly installed on the side of the two sliding rods that are close to each other. Limiting strips are rotatably installed on the side of the two sliding rods that are close to each other.

[0011] A limiting component, which is located inside one of the sliding rods and is used to limit the rotation of one of the limiting bars.

[0012] In this technical solution, when electromagnetic compatibility testing of a mobile phone is required, the sealing door is first opened outward, then one of the sliding rods is pulled to slide away from the other sliding rod, and at the same time, several tension springs are stretched. Then the mobile phone under test is placed between the two limiting bars. Next, one of the sliding rods is released, and under the tension of the several tension springs, one of the sliding rods slides closer to the other sliding rod. Finally, the two limiting bars can hold the mobile phone under test.

[0013] When the angle of the tested phone needs to be adjusted, one of the limit bars can be rotated through the set limit components. One limit bar drives the tested phone and the other limit bar to rotate. When the tested phone rotates to the appropriate position, the position of the limit post can be fixed through the set limit components. The fixed position of the limit post further fixes the angle of the tested phone, making it convenient for staff to adjust the angle of the tested phone. The operation is convenient and quick.

[0014] When the height of the phone under test needs to be adjusted, the drive component can drive several threaded rods to rotate. Under the action of the threads, the threaded rods drive the sliding column to slide upward. The sliding column drives the fixing bar and the phone under test to move upward, which makes it convenient for staff to adjust the height of the phone under test. During the height adjustment process, the displacement of the phone under test is relatively stable and will not shake or fall.

[0015] In the above technical solution, the driving component further includes:

[0016] A gear ring is rotatably mounted in a rotating groove and located below a threaded rod. Several gears are meshed on the inner side of the gear ring. The gears are located at the bottom of several threaded rods and are fixedly connected to the threaded rods. All gears are rotatably connected to the rotating groove.

[0017] In this technical solution, when it is necessary to adjust the height of the mobile phone under test, the gear ring is first rotated, which drives the several gears meshing with it to rotate. The gears drive the several threaded rods to rotate. Under the action of the threads, the several threaded rods drive the sliding column to slide upward. The sliding column drives the fixed bar and the mobile phone under test to move upward, which makes it convenient for the staff to adjust the height of the mobile phone under test. During the height adjustment process, the displacement of the mobile phone under test is relatively stable and will not shake or fall.

[0018] In the above technical solution, the limiting component further includes...

[0019] A limiting post is fixedly installed on one side of one of the limiting strips, one end of the limiting post extends into one of the sliding rods, and the limiting post is rotatably connected to one of the sliding rods;

[0020] A limiting groove is provided, which is formed inside one of the sliding rods and located at the top of the limiting post. A limiting rod is slidably installed in the limiting groove, and a disc is fixedly installed on the limiting rod. The disc is slidably connected to the limiting groove. A tension spring is fixedly installed at the bottom of the disc and fixed to the inner wall of the limiting groove. Several limiting holes are formed on the circumferential side wall of the limiting post. The lower end of the limiting rod extends into the corresponding limiting hole and is inserted into the limiting hole. The upper end of the limiting rod passes through the limiting groove and extends to the outside.

[0021] In this technical solution, when the angle of the tested mobile phone needs to be adjusted, the limiting rod can be pulled upward, causing the disc to move upward. At the same time, the second tension spring is stretched. After the lower end of the limiting rod disengages from one of the limiting holes, one of the limiting strips can be rotated. One limiting strip causes the tested mobile phone and the other limiting strip to rotate. When the tested mobile phone rotates to the appropriate position, the limiting rod is released. Under the tension of the second tension spring, the disc causes the limiting rod to slide downward. The lower end of the limiting rod inserts into the corresponding limiting hole, which can fix the position of the limiting post. The fixed position of the limiting post further fixes the angle of the tested mobile phone, making it convenient for staff to adjust the angle of the tested mobile phone. The operation is convenient and quick.

[0022] In the above technical solution, furthermore, a number of tie rods are fixedly installed on the circumferential sidewall of the toothed ring.

[0023] In this technical solution, the gear ring is easily rotated by the pull rod.

[0024] In the above technical solution, further, the plurality of limiting holes are distributed in a ring at equal intervals, and the plurality of threaded rods are distributed in a ring at equal intervals.

[0025] In this technical solution, the position of the limiting post can be fixed at any angle, ensuring that the displacement of the tested mobile phone is relatively stable during the height adjustment process and that it will not shake or fall.

[0026] In the above technical solution, a further step is to fix an anti-slip rubber pad that is in close contact with the inner wall of the rotating groove on the toothed ring.

[0027] In this technical solution, the anti-slip rubber pad ensures that the toothed ring will not rotate when no staff are operating it, thus ensuring that the phone's position will not shift during testing.

[0028] In the above technical solution, the output shaft of the motor is rotatably connected to the base.

[0029] In this technical solution, it is ensured that the output shaft of the motor can rotate within the base.

[0030] The beneficial effects of this utility model are:

[0031] 1. This test chamber for electromagnetic compatibility testing of mobile phones allows for the adjustment of the angle of the tested mobile phone by rotating one of the limiting bars through a set limiting component. This rotating bar causes the tested mobile phone and the other limiting bar to rotate. When the tested mobile phone rotates to the appropriate position, the limiting component fixes the position of the limiting post. Fixing the position of the limiting post further fixes the angle of the tested mobile phone, making it convenient for staff to adjust the angle of the tested mobile phone. The operation is convenient and quick.

[0032] 2. This test chamber for electromagnetic compatibility testing of mobile phones can rotate several threaded rods by a set drive component when the height of the mobile phone under test needs to be adjusted. Under the action of the threads, the threaded rods drive the sliding column to slide upward. The sliding column drives the fixed bar and the mobile phone under test to move upward, which makes it convenient for the staff to adjust the height of the mobile phone under test. During the height adjustment process, the displacement of the mobile phone under test is relatively stable and will not shake or fall. Attached Figure Description

[0033] Figure 1 This is one of the overall structural schematic diagrams of this utility model;

[0034] Figure 2 This is the second schematic diagram of the overall structure of this utility model;

[0035] Figure 3This is a schematic diagram of the cross-sectional structure of the base of this utility model;

[0036] Figure 4 This is one of the schematic diagrams of the cross-sectional structure of the rotating column of this utility model;

[0037] Figure 5 This is the second schematic diagram of the cross-sectional structure of the rotating column of this utility model;

[0038] Figure 6 This is a schematic diagram of the cross-sectional structure of the fixing strip of this utility model;

[0039] Figure 7 This is a schematic diagram of the cross-sectional structure of the sliding rod of this utility model;

[0040] Figure 8 This is a schematic diagram of the limiting post area structure of this utility model.

[0041] The markings in the diagram are as follows:

[0042] 1. Test chamber body; 2. Sealed door; 3. Base; 4. Motor; 5. Rotating column; 6. Rotating groove; 7. Sliding column; 8. Threaded rod; 9. Fixing strip; 10. Sliding groove; 11. Sliding rod; 12. Tension spring one; 13. Limiting strip; 14. Gear; 15. Gear ring; 16. Limiting column; 17. Limiting groove; 18. Limiting rod; 19. Disc; 20. Tension spring two; 21. Limiting hole; 22. Anti-slip rubber pad; 23. Pull rod. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0044] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0045] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0046] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0047] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0048] Example 1:

[0049] Please see Figure 1 - Figure 8 As shown, this embodiment provides a test chamber for electromagnetic compatibility testing of mobile phones, including:

[0050] The test chamber body 1 has a sealing door 2 rotatably installed on the front side of the test chamber body 1. A base 3 is fixedly installed inside the test chamber body 1. A motor 4 is fixedly installed inside the base 3. The output shaft of the motor 4 passes through the base 3 and is fixedly installed with a rotating column 5. A rotating groove 6 is opened in the rotating column 5. A sliding column 7 is slidably installed in the rotating groove 6. Several threaded rods 8 are rotatably installed in the rotating groove 6 and below the sliding column 7. The upper ends of the several threaded rods 8 extend into the sliding column 7, and the several threaded rods 8 are threadedly connected to the sliding column 7.

[0051] A drive assembly is located inside the rotating column 5 and is used to drive several threaded rods 8 to rotate.

[0052] The fixing strip 9 is fixedly installed on the top of the sliding column 7. The top of the fixing strip 9 is symmetrically provided with sliding grooves 10. Sliding rods 11 are slidably installed in both sliding grooves 10. Several tension springs 12 that are fixed to the inner wall of the corresponding sliding groove 10 are fixedly installed on the side of the two sliding rods 11 that are close to each other. Limiting strips 13 are rotatably installed on the side of the two sliding rods 11 that are close to each other.

[0053] A limiting component is located within one of the sliding rods 11 and is used to limit the rotation of one of the limiting bars 13.

[0054] When electromagnetic compatibility testing of a mobile phone is required, the sealing door 2 is first opened outwards. Then, one of the sliding rods 11 is pulled to slide away from the other sliding rod 11. At the same time, several tension springs 12 are stretched. Then, the mobile phone under test is placed between the two limiting bars 13. Next, one of the sliding rods 11 is released. Under the pulling force of several tension springs 12, one of the sliding rods 11 slides closer to the other sliding rod 11. Finally, the two limiting bars 13 can hold the mobile phone under test.

[0055] When the angle of the tested mobile phone needs to be adjusted, one of the limit bars 13 can be rotated through the set limit components. One limit bar 13 drives the tested mobile phone and the other limit bar 13 to rotate. When the tested mobile phone rotates to the appropriate position, the position of the limit post 16 can be fixed through the set limit components. The fixed position of the limit post 16 further fixes the angle of the tested mobile phone, making it convenient for staff to adjust the angle of the tested mobile phone. The operation is convenient and quick.

[0056] When the height of the phone under test needs to be adjusted, the drive component can drive several threaded rods 8 to rotate. Under the action of the threads, the threaded rods 8 drive the sliding column 7 to slide upward. The sliding column 7 drives the fixing strip 9 and the phone under test to move upward, which makes it convenient for staff to adjust the height of the phone under test. During the height adjustment process, the displacement of the phone under test is relatively stable and will not shake or fall.

[0057] In this embodiment, the driving component includes:

[0058] A gear ring 15 is rotatably installed in the rotating groove 6 and located below the threaded rod 8. Several gears 14 are meshed on the inner side of the gear ring 15. The several gears 14 are located at the bottom of several threaded rods 8 respectively, and the several gears 14 are fixedly connected to the several threaded rods 8 respectively. The several gears 14 are all rotatably connected to the rotating groove 6.

[0059] When the height of the tested mobile phone needs to be adjusted, the gear ring 15 is rotated first, which drives the gears 14 meshing with it to rotate. The gears 14 drive the threaded rods 8 to rotate. Under the action of the threads, the threaded rods 8 drive the sliding column 7 to slide upward. The sliding column 7 drives the fixing bar 9 and the tested mobile phone to move upward, which makes it convenient for the staff to adjust the height of the tested mobile phone. During the height adjustment process, the displacement of the tested mobile phone is relatively stable and will not shake or fall.

[0060] In this embodiment, the limiting component includes

[0061] A limiting post 16 is fixedly installed on one side of one of the limiting bars 13. One end of the limiting post 16 extends into one of the sliding rods 11, and the limiting post 16 is rotatably connected to one of the sliding rods 11.

[0062] A limiting groove 17 is formed inside one of the sliding rods 11 and located at the top of the limiting post 16. A limiting rod 18 is slidably installed inside the limiting groove 17. A disc 19 is fixedly installed on the limiting rod 18. The disc 19 is slidably connected to the limiting groove 17. A tension spring 20 is fixedly installed at the bottom of the disc 19 and fixed to the inner wall of the limiting groove 17. Several limiting holes 21 are formed on the circumferential side wall of the limiting post 16. The lower end of the limiting rod 18 extends into the corresponding limiting hole 21 and is inserted into the limiting hole 21. The upper end of the limiting rod 18 passes through the limiting groove 17 and extends to the outside.

[0063] When the angle of the phone under test needs to be adjusted, the limiting rod 18 can be pulled upward, causing the disc 19 to move upward. At the same time, the tension spring 20 is stretched. After the lower end of the limiting rod 18 disengages from one of the limiting holes 21, one of the limiting bars 13 can be rotated. One limiting bar 13 causes the phone under test and the other limiting bar 13 to rotate. When the phone under test is rotated to the appropriate position, the limiting rod 18 is released. Under the tension of the tension spring 20, the disc 19 causes the limiting rod 18 to slide downward. The lower end of the limiting rod 18 is inserted into the corresponding limiting hole 21, which can fix the position of the limiting post 16. The fixed position of the limiting post 16 further fixes the angle of the phone under test, making it convenient for staff to adjust the angle of the phone under test. The operation is convenient and quick.

[0064] Example 2:

[0065] This embodiment provides a test box for electromagnetic compatibility testing of mobile phones, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0066] In this embodiment, a number of tie rods 23 are fixedly installed on the circumferential sidewall of the toothed ring 15.

[0067] The pull rod 23 facilitates the rotation of the gear ring 15.

[0068] Example 3:

[0069] This embodiment provides a test box for electromagnetic compatibility testing of mobile phones, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0070] In this embodiment, a plurality of limiting holes 21 are distributed in a ring at equal intervals, and a plurality of threaded rods 8 are distributed in a ring at equal intervals.

[0071] In particular, it ensures that the position of the limiting post 16 can be fixed at any angle, so that the displacement of the tested mobile phone is relatively stable during the height adjustment process and will not shake or fall.

[0072] Example 4:

[0073] This embodiment provides a test box for electromagnetic compatibility testing of mobile phones, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0074] In this embodiment, a non-slip rubber pad 22 that is in close contact with the inner wall of the rotating groove 6 is fixedly installed on the toothed ring 15.

[0075] The anti-slip rubber pad 22 ensures that the toothed ring 15 will not rotate without the help of staff, thus ensuring that the phone will not shift during testing.

[0076] Example 5:

[0077] This embodiment provides a test box for electromagnetic compatibility testing of mobile phones, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0078] In this embodiment, the output shaft of the motor 4 is rotatably connected to the base 3.

[0079] This ensures that the output shaft of motor 4 can rotate within base 3.

[0080] It is worth noting that when the tested mobile phone is undergoing electromagnetic testing, the receiving antenna on the test box body 1 receives the electromagnetic radiation emitted by the tested mobile phone and transmits it to the control system. The control system is located between the inner wall of the test box body 1 and the shielding steel plate of the test box body 1. The central processing module on the test box body 1 imports electromagnetic field simulation, parameter extraction, signal analysis, simulation calculation and data processing software. After the central processing module on the test box body 1 receives the signal emitted by the receiving antenna on the test box body 1, the electromagnetic radiation signal is processed through these steps and can be displayed on the display screen on the test box body 1. It can also be transmitted to an external PC through the USB port on the test box body 1 by the data transmission module on the test box body 1.

[0081] The structure and principle of the electromagnetic compatibility test in this embodiment are existing technologies. For details, please refer to the prior art document (publication number CN209030274U, patent name: a test box for electromagnetic compatibility testing of mobile phones), which will not be repeated here.

[0082] Working principle: When electromagnetic compatibility testing of a mobile phone is required, first open the sealing door 2 outward, then pull one of the sliding rods 11 to slide away from the other sliding rod 11. At the same time, several tension springs 12 are stretched. Then place the mobile phone under test between the two limiting bars 13. Next, release one of the sliding rods 11. Under the pulling force of several tension springs 12, one of the sliding rods 11 slides closer to the other sliding rod 11. Finally, the two limiting bars 13 can hold the mobile phone under test.

[0083] When the angle of the phone under test needs to be adjusted, the limiting rod 18 can be pulled upwards, causing the disc 19 to move upwards. At the same time, the tension spring 20 is stretched. After the lower end of the limiting rod 18 disengages from one of the limiting holes 21, one of the limiting bars 13 can be rotated. One limiting bar 13 causes the phone under test and the other limiting bar 13 to rotate. When the phone under test rotates to the appropriate position, the limiting rod 18 is released. Under the tension of the tension spring 20, the disc 19 causes the limiting rod 18 to slide downwards. The lower end of the limiting rod 18 is inserted into the corresponding limiting hole 21, which can fix the position of the limiting post 16. The fixed position of the limiting post 16 further fixes the angle of the phone under test, making it convenient for staff to adjust the angle of the phone under test. The operation is convenient and quick.

[0084] When the height of the phone under test needs to be adjusted, first rotate one of the levers 23 and drive the gear ring 15 to rotate. The gear ring 15 then drives several gears 14 meshing with it to rotate. The gears 14 drive several threaded rods 8 to rotate. Under the action of the threads, the threaded rods 8 drive the sliding column 7 to slide upward. The sliding column 7 drives the fixing bar 9 and the phone under test to move upward, making it convenient for staff to adjust the height of the phone under test. During the height adjustment process, the displacement of the phone under test is relatively stable and will not shake or fall.

[0085] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A test chamber for electromagnetic compatibility testing of mobile phones, characterized in that, include: The test box body (1) has a sealing door (2) rotatably installed on the front side of the test box body (1). A base (3) is fixedly installed inside the test box body (1). A motor (4) is fixedly installed inside the base (3). The output shaft of the motor (4) passes through the base (3) and is fixedly installed with a rotating column (5). A rotating groove (6) is opened in the rotating column (5). A sliding column (7) is slidably installed in the rotating groove (6). Several threaded rods (8) are rotatably installed in the rotating groove (6) and below the sliding column (7). The upper ends of several threaded rods (8) extend into the sliding column (7), and several threaded rods (8) are threadedly connected to the sliding column (7). A drive assembly located inside a rotating column (5) and used to drive a plurality of threaded rods (8) to rotate; A fixing strip (9) is fixedly installed on the top of the sliding column (7). The top of the fixing strip (9) is symmetrically provided with sliding grooves (10). Sliding rods (11) are slidably installed in both sliding grooves (10). Several tension springs (12) that are fixed to the inner wall of the corresponding sliding groove (10) are fixedly installed on the side of the two sliding rods (11) that are close to each other. Limiting strips (13) are rotatably installed on the side of the two sliding rods (11) that are close to each other. A limiting component is located within one of the sliding rods (11) and is used to limit the rotation of one of the limiting bars (13).

2. The test chamber for electromagnetic compatibility testing of mobile phones according to claim 1, characterized in that, The driving component includes: A toothed ring (15) is rotatably mounted in a rotating groove (6) and located below a threaded rod (8). A plurality of gears (14) are meshed on the inner side of the toothed ring (15). The plurality of gears (14) are located at the bottom of the plurality of threaded rods (8) respectively, and the plurality of gears (14) are fixedly connected to the plurality of threaded rods (8) respectively. The plurality of gears (14) are rotatably connected to the rotating groove (6).

3. A test chamber for electromagnetic compatibility testing of mobile phones according to claim 2, characterized in that, The limiting component includes A limiting post (16) is fixedly installed on one side of one of the limiting strips (13), one end of the limiting post (16) extends into one of the sliding rods (11), and the limiting post (16) is rotatably connected to one of the sliding rods (11). A limiting groove (17) is formed in one of the sliding rods (11) and located at the top of the limiting post (16). A limiting rod (18) is slidably installed in the limiting groove (17). A disc (19) is fixedly installed on the limiting rod (18). The disc (19) is slidably connected to the limiting groove (17). A tension spring (20) is fixedly installed at the bottom of the disc (19) and fixed to the inner wall of the limiting groove (17). Several limiting holes (21) are formed on the circumferential side wall of the limiting post (16). The lower end of the limiting rod (18) extends into the corresponding limiting hole (21) and is inserted into the limiting hole (21). The upper end of the limiting rod (18) passes through the limiting groove (17) and extends to the outside.

4. A test chamber for electromagnetic compatibility testing of mobile phones according to claim 2, characterized in that, Several tie rods (23) are fixedly installed on the circumferential sidewall of the toothed ring (15).

5. A test chamber for electromagnetic compatibility testing of mobile phones according to claim 3, characterized in that, The limiting holes (21) are distributed in a ring at equal intervals, and the threaded rods (8) are distributed in a ring at equal intervals.

6. A test chamber for electromagnetic compatibility testing of mobile phones according to claim 2, characterized in that, The toothed ring (15) is fixedly installed with an anti-slip rubber pad (22) that is in close contact with the inner wall of the rotating groove (6).

7. A test chamber for electromagnetic compatibility testing of mobile phones according to claim 1, characterized in that, The output shaft of the motor (4) is rotatably connected to the base (3).

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