Low-scattering foam support for supporting test target of compact range

Abstract

The utility model relates to a low-scattering foam support used for supporting a test target of a compact range. The low-scattering foam support comprises a foam support, a wave absorbing plate installed at the bottom of the foam support and a posture adjusting table used for being connected with the wave absorbing plate. The foam support is a regular cylinder and comprises a truncated cone cylinder part and a cylinder part; the truncated cone column part and the cylinder part are coaxially arranged, and the truncated cone column part is arranged at the upper end of the cylinder part; the wave absorbing plate is connected to the end, away from the truncated cone column part, of the cylinder part, and the wave absorbing plate covers the end of the cylinder part. According to the utility model, electromagnetic influence on the supported measured object can be effectively avoided through the arranged foam support, and the accuracy and reliability of the measurement process can be facilitated. In addition, a wave absorbing plate can be arranged at the bottom of the foam support, so that the influence of coupling between the posture adjusting table below and the measured object on the electromagnetic measurement process can be effectively blocked.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic measurement, in particular to a low-scattering foam support for supporting a test target of a compact range. Background Art

[0002] The compact range is the preferred solution for high-precision target radar cross-section and antenna pattern testing and evaluation. Traditional compact ranges have the advantages of high precision, low background, all-weather operation, good confidentiality, etc. Currently, compact ranges are generally built in fixed and enclosed anechoic chambers, and then the target to be measured can be placed in the quiet zone of the fixed compact range for testing.

[0003] In target scattering measurement, the radar cross-section (RCS) is becoming increasingly important as an important indicator. Furthermore, target scattering measurement based on a compact range has the advantages of a stable electromagnetic environment and being less susceptible to external factors. The clutter in the compact range is mainly fixed clutter, and its sources are mainly direct leakage of the feed, reflected waves from the reflector and the wall, etc. For example, in target scattering measurement, the support for the target to be measured is one of the most important sources of background noise. From the perspective of mechanical and electrical properties, foam materials have the advantages of a dielectric constant close to that of air, strong wave transmission, small body scattering, easy processing and low cost, and can be a good material for a low-scattering RCS support for carrying heavy targets. Therefore, foam supports are usually used as low-scattering supports to support the target to be measured in open-field radiation and scattering measurements. However, due to the generally large volume and weight of foam supports, they generally require a certain movable carrier for movement. However, since movable carriers usually do not have a low-scattering effect, movable carriers usually have a great impact on the measurement process, resulting in interference to the entire measurement result. Therefore, there is an urgent need for a better support structure to reduce the impact on the measurement process. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a low-scattering foam support for supporting a test target of a compact range.

[0005] To achieve the above-mentioned utility model purpose, the utility model provides a low-scattering foam support for supporting a test target of a compact range, including: a foam support, an absorbing plate installed at the bottom of the foam support, and an attitude adjustment platform for connecting with the absorbing plate;

[0006] The foam support is a regular columnar body, and it includes: a truncated cone column part and a cylindrical part;

[0007] The truncated cone column part and the cylindrical part are coaxially arranged, and the truncated cone column part is arranged at the upper end of the cylindrical part;

[0008] The wave-absorbing plate is connected to one end of the cylindrical part away from the truncated conical column part, and the wave-absorbing plate covers the end of the cylindrical part.

[0009] According to one aspect of the present invention, the bottom end of the truncated conical column part is arranged to be consistent with the upper end of the cylindrical part, and the truncated conical column part and the cylindrical part are adhesively bonded to each other.

[0010] According to one aspect of the present invention, the truncated conical column part includes: a plurality of truncated conical column structures;

[0011] In the direction from top to bottom, the plurality of truncated conical column structures are arranged coaxially in sequence;

[0012] The end faces between adjacent truncated conical column structures are arranged to be consistent.

[0013] According to one aspect of the present invention, in the direction from top to bottom, the height of the first truncated conical column structure of the truncated conical column part is less than the height of the remaining truncated conical column structures, and the heights of the remaining truncated conical column structures are the same.

[0014] According to one aspect of the present invention, in the direction from top to bottom, the first truncated conical column structure of the truncated conical column part is detachable, and the remaining truncated conical column structures are adhesively bonded to each other.

[0015] According to one aspect of the present invention, a carrying groove is provided at one end of the cylindrical part connected to the wave-absorbing plate;

[0016] In the radial direction of the cylindrical part, a plurality of the carrying grooves are arranged at intervals.

[0017] According to one aspect of the present invention, both the truncated conical column structure and the cylindrical part are polystyrene foam structures;

[0018] The wave-absorbing plate is a PMI material plate, and the flatness of the surface of the wave-absorbing plate ≤ 2 mm, and the parallelism of the upper and lower surfaces ≤ 4 mm.

[0019] According to one aspect of the present invention, the attitude adjustment table includes: a table body, a rotation mechanism arranged in the table body, a table top connected to the rotation mechanism, and a leveling structure connected to the bottom of the table body;

[0020] The shape and size of the table top are arranged to be consistent with those of the wave-absorbing plate, or the size of the table top is smaller than the size of the wave-absorbing plate;

[0021] The wave-absorbing plate is detachably connected to the table top;

[0022] An annular support is provided at the bottom end of the table body;

[0023] The leveling structure is detachably connected to the annular support, and a plurality of the leveling structures are arranged at equal intervals along the circumferential direction of the annular support;

[0024] The leveling structure includes: a connecting plate body, and a leveling nut connected to the leveling structure;

[0025] The upper end of the leveling nut is threadedly connected to the annular support, and its lower end is movably connected to the connecting plate body.

[0026] According to one aspect of the present invention, the attitude adjustment table further includes: a shielding screen;

[0027] A high-angle cone absorbing structure is provided on the outer side of the shielding screen;

[0028] The shielding screen is integrally in a plate-like structure, and includes: a first plate body part and a second plate body part;

[0029] The first plate body part and the second plate body part are arranged at an included angle;

[0030] The shielding screen is arranged at an interval from the table body, and the opening direction of the bending of the shielding screen faces the table body;

[0031] Along the vertical direction, the height of the shielding screen is greater than or equal to the overall height of the attitude adjustment table;

[0032] Along the horizontal direction, the projection size of the shielding screen is greater than or equal to the overall radial size of the attitude adjustment table.

[0033] According to one aspect of the present invention, it further includes: a mobile vehicle for supporting the attitude adjustment table;

[0034] The mobile vehicle includes: a vehicle platform and a movable support connected to the bottom of the vehicle platform;

[0035] The connecting plate body is connected to the vehicle platform by a threaded connector.

[0036] According to one solution of the present invention, the electromagnetic influence on the measured object supported by the present invention can be effectively avoided by the provided foam support, which is beneficial to the accuracy and reliability of the measurement process. In addition, an absorbing plate can be provided at the bottom of the foam support, which can effectively block the influence of the lower attitude adjustment table on the electromagnetic measurement process, so as to further effectively ensure the measurement accuracy of the anechoic chamber using the present invention.

[0037] According to one solution of the present utility model, the frustum column part and the cylindrical part are bonded, which can effectively ensure the flatness of the connection position, effectively avoid the influence of the internal structural change of the foam support on the measurement process. In addition, the structure of the whole foam support can be effectively simplified by the bonding method, and the production cost of the whole foam support is reduced.

[0038] According to one solution of the present utility model, by adopting a plurality of frustum column structures to achieve splicing and form a low-scattering foam support, not only can the manufacturing difficulty of the foam support be effectively simplified, but also the size of the foam support can be conveniently and flexibly controlled, so that it can be flexibly set according to the anechoic chamber and the test target.

[0039] According to one solution of the present utility model, based on the method of arranging a handling groove at the bottom of the foam support, the embedding installation of the handling structure can be conveniently realized, so as to facilitate the overall handling of the foam support of the present utility model, and the damage to the outer surface of the foam support can be effectively avoided.

[0040] According to one solution of the present utility model, a shielding screen is arranged on one side of the attitude adjustment table of the present utility model, and an absorbing layer structure can be conveniently arranged on the shielding screen. Furthermore, the electromagnetic wave reflection on the side of the attitude adjustment table during the electromagnetic test in the anechoic chamber can be effectively prevented through the arranged absorbing layer structure, effectively ensuring the accuracy of the test process. Description of the Drawings

[0041] Figure 1 is a schematic perspective view of a low-scattering foam bracket according to an embodiment of the present utility model;

[0042] Figure 2 is a schematic structural diagram of a low-scattering foam bracket according to an embodiment of the present utility model;

[0043] Figure 3 is a schematic combined structural diagram of an attitude adjustment table and a mobile vehicle according to an embodiment of the present utility model. Detailed Embodiment

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] When describing the embodiments of the present invention, the orientation or positional relationships expressed by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" are based on the orientation or positional relationships shown in the relevant drawings. These are only for the convenience of describing 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. Therefore, the above terms should not be construed as limiting the present invention.

[0046] The present invention will be described in detail below in conjunction with the drawings and specific embodiments. The embodiments cannot be elaborated one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0047] Combined with Figure 1 、 Figure 2 and Figure 3 As shown, according to an embodiment of the present invention, a low-scattering foam bracket for supporting a test target of a compact range of the present invention includes: a foam support 1, an absorbing plate 2 installed at the bottom of the foam support 1, and an attitude adjustment table 3 for connecting with the absorbing plate 2; in this embodiment, the foam support 1 is a regular columnar body, and it includes: a truncated cone column part 11 and a cylindrical part 12; wherein, the truncated cone column part 11 and the cylindrical part 12 are coaxially arranged, and the truncated cone column part 11 is arranged at the upper end of the cylindrical part 12. In this embodiment, the absorbing plate 2 is connected to one end of the cylindrical part 12 away from the truncated cone column part 11, and the absorbing plate 2 covers the end of the cylindrical part 12.

[0048] Through the above settings, the present invention can effectively avoid the electromagnetic influence on the measured object supported by the provided foam support 1, which is beneficial to the accuracy and reliability of the measurement process. In addition, by setting the absorbing plate 2 at the bottom of the foam support 1, the influence of the lower attitude adjustment table 3 on the electromagnetic measurement process can be effectively blocked, so as to further effectively ensure the measurement accuracy of the compact range using the present invention.

[0049] Combined with Figure 1 、 Figure 2 and Figure 3 As shown, according to an embodiment of the present invention, the bottom end of the truncated cone column part 11 is arranged to be consistent with the upper end of the cylindrical part 12, and the truncated cone column part 11 and the cylindrical part 12 are adhesively bonded to each other.

[0050] With the above settings, the frustum column part 11 and the cylindrical part 12 are adhesively bonded, which can effectively ensure the flatness of the connection position and effectively avoid the influence of the structural change inside the foam support 1 on the measurement process. In addition, the adhesive bonding method can effectively simplify the structure of the entire foam support 1 and reduce the production cost of the entire foam support 1.

[0051] Combined Figure 1 、 Figure 2 and Figure 3 As shown, according to an embodiment of the present invention, the frustum column part 11 includes: a plurality of frustum column structures 111; wherein, along the direction from top to bottom, the plurality of frustum column structures 111 are coaxially arranged in sequence. In this embodiment, the end faces between adjacent frustum column structures 111 are arranged to be consistent.

[0052] With the above settings, by using a plurality of frustum column structures 111 to splice and form the foam support 1, not only can the manufacturing difficulty of the foam support 1 be effectively simplified, but also the size of the foam support 1 can be conveniently and flexibly controlled, enabling it to be flexibly set for the compact range and test target.

[0053] Combined Figure 1 、 Figure 2 and Figure 3 As shown, according to an embodiment of the present invention, along the direction from top to bottom, the height of the first frustum column structure 111 of the frustum column part 11 is less than the height of the remaining frustum column structures 111, and the heights of the remaining frustum column structures 111 are the same.

[0054] With the above settings, by setting the height of the uppermost frustum column structure 111 to be different from the height of the other frustum column structures 111, it is convenient to flexibly control the overall height of the entire foam support 1 by setting the height of the uppermost frustum column structure 111 and the different numbers of the remaining frustum column structures 111, so that the foam support 1 can flexibly adapt to different compact ranges and test targets to improve the flexibility of use of the present invention.

[0055] Combined Figure 1 、 Figure 2 and Figure 3As shown, according to an embodiment of the present utility model, in the direction from top to bottom, the first frustum column structure 111 of the frustum column part 11 is detachable, and the remaining frustum column structures 111 are adhesively bonded to each other. In this embodiment, the uppermost frustum column structure 111 can be detachably installed with other frustum column structures 111 by means of fitting, and its disassembly and assembly are more convenient and flexible. In addition, by adopting the bonding method for the remaining frustum column structures 111, the flatness of the bonding plane can be effectively guaranteed, so as to reduce the structural complexity of adjacent frustum column structures 111, and effectively reduce the manufacturing difficulty and production cost of the foam support 1. In addition, by setting the lower frustum column structures 111 to have the same height, the versatility and practicability of its structure can be effectively improved.

[0056] Combined with Figure 1 、 Figure 2 and Figure 3 As shown, according to an embodiment of the present utility model, a handling groove 121 is provided at one end of the cylindrical part 12 connected to the absorbing plate 2; wherein, along the radial direction of the cylindrical part 12, a plurality of handling grooves 121 are provided at intervals. In this embodiment, the cross-sectional shape of the handling groove 121 can be set as a rectangle or a circle.

[0057] Through the above setting, based on the way of arranging the handling groove 121 at the bottom of the foam support 1, the embedded installation of the handling structure can be conveniently realized, so as to facilitate the overall handling of the foam support 1 of the present utility model, and effectively avoid damage to the outer surface of the foam support 1.

[0058] Combined with Figure 1 、 Figure 2 and Figure 3 As shown, according to an embodiment of the present utility model, both the frustum column structure 111 and the cylindrical part 12 are polystyrene foam structures.

[0059] Through the above-set frustum column structure 111 and cylindrical part 12, they have excellent low-scattering characteristics, so that the present utility model has excellent low-scattering performance.

[0060] Furthermore, the absorbing plate 2 is a PMI material plate, and the surface flatness of the absorbing plate 2 ≤ 2 mm, and the parallelism of the upper and lower surfaces ≤ 4 mm; wherein, the reflectivity of the absorbing plate 2 in the frequency band range of 1 GHz to 40 GHz ≤ -15 dB, and the compressive strength of the absorbing plate 2 ≥ 8 Mpa.

[0061] Through the above setting, by setting the absorbing plate 2 as a high-strength absorbing plate of PMI material, the absorption effect of electromagnetic waves can be fully realized, the isolation of the attitude adjustment table 3 can be effectively realized, the coupling between the attitude adjustment table and the object under test can be reduced, and the test accuracy of the compact range adopting this scheme is effectively guaranteed.

[0062] Combined Figure 1 、 Figure 2 and Figure 3 As shown, according to an embodiment of the present utility model, the attitude adjustment table 3 includes: a table body 31, a rotation mechanism disposed within the table body 31, a table top 32 connected to the rotation mechanism, and a leveling structure 33 connected to the bottom of the table body 31; in this embodiment, the rotation mechanism can be set as a rotation motor, and its rotation axis is arranged upward to achieve connection with the table top 32, so as to facilitate the rotation of the table top 32. In this embodiment, the shape and size of the table top 32 are set to be consistent with those of the wave-absorbing plate 2, and the wave-absorbing plate 2 is detachably connected to the table top 32. In this embodiment, in order to facilitate the controlled operation of the rotation mechanism, a controller can be arranged within the table body 31 to achieve accurate control of the rotation mechanism; among them, the controller can adopt a PLC controller.

[0063] In another embodiment, the size of the wave-absorbing plate 2 can also be set to be larger than that of the table top 32. Thus, a groove can be provided on the lower side of the wave-absorbing plate 2 so that the wave-absorbing plate 2 is fitted and connected to the table top 32 to achieve the surrounding of the table top 32 by the wave-absorbing plate 2, which can further effectively isolate the reflection of electromagnetic waves by the attitude adjustment table 3.

[0064] In this embodiment, an annular support 311 is provided at the bottom end of the table body 31. Among them, the annular support 311 is an overall annular plate and extends radially outward along the table body 31. In this embodiment, the leveling structure 33 is detachably connected to the annular support 311, and a plurality of leveling structures 33 are equally spaced along the circumferential direction of the annular support 311.

[0065] In this embodiment, the leveling structure 33 includes: a connecting plate body 331 and a leveling nut 332 connected to the leveling structure 33; among them, the upper end of the leveling nut 332 is threadedly connected to the annular support 311, and its lower end is movably connected to the connecting plate body 331. In this embodiment, the connecting plate body 331 is an overall regular plate body, and its lower end can be connected to the leveling nut 332 in a rotational manner or in a threaded connection manner. In this embodiment, through holes for the size of threaded connectors to pass through are also provided on the connecting plate body 331. Furthermore, the connecting plate body 331 can be fixed to the corresponding carrying vehicle through the through holes on the connecting plate body 331 and the threaded connectors, so as to facilitate the accurate and reliable fixation of the attitude adjustment table 3.

[0066] In this embodiment, by rotating the leveling nut 332, the height and levelness of the table body 31 in the vertical direction can be flexibly adjusted. Specifically, through a plurality of spaced leveling structures 33, selectively adjusting the corresponding leveling nut 332 can achieve flexible and accurate adjustment of the table body 31.

[0067] Combined with Figure 1 、 Figure 2 and Figure 3 As shown, according to an embodiment of the present invention, the attitude adjustment table 3 further includes: a shielding screen 34; wherein, the shielding screen 34 is integrally in a plate-like structure, which includes: a first plate body portion 341 and a second plate body portion 342. In this embodiment, the first plate body portion 341 and the second plate body portion 342 are arranged at an angle; wherein, the included angle between the first plate body portion 341 and the second plate body portion 342 is 150°. In this embodiment, the shielding screen 34 is arranged at an interval from the table body 31, and the opening direction of the bend of the shielding screen 34 faces the table body 31. In this embodiment, along the vertical direction, the height of the shielding screen 34 is greater than or equal to the overall height of the attitude adjustment table 3; along the horizontal direction, the projection size of the shielding screen 34 is greater than or equal to the overall radial size of the attitude adjustment table 3.

[0068] Through the above settings, by arranging the shielding screen 34 on one side of the attitude adjustment table 3, it is convenient to set an absorbing layer structure on the shielding screen 34. Furthermore, the absorbing layer structure can effectively prevent the reflection of electromagnetic waves on the side of the attitude adjustment table 3 during the electromagnetic test in the anechoic chamber, effectively ensuring the accuracy of the test process.

[0069] In this embodiment, the absorbing layer structure on the shielding screen 34 can be connected by means of pasting, and among them, the absorbing layer structure can adopt a high-angle cone absorbing structure. In this embodiment, the height of the absorbing layer structure is greater than or equal to 500 mm.

[0070] Through the above settings, the absorbing layer structure can effectively absorb electromagnetic waves, effectively suppress the influence on the test process, and effectively improve the test accuracy of the present invention.

[0071] Combined with Figure 1 、 Figure 2 and Figure 3 As shown, according to an embodiment of the present invention, the test target support foam bracket of the present invention further includes: a mobile carrier 4 for supporting the attitude adjustment table 3; in this embodiment, the mobile carrier 4 includes: a carrier platform 41 and a movable support 42 connected to the bottom of the carrier platform 41; wherein, the movable support 42 can be realized by structures such as rollers or slide rails, so as to facilitate the flexible movement of the entire test target support foam bracket to adjust the corresponding position.

[0072] In this embodiment, the connecting plate body 331 is connected to the carrier platform 41 by means of threaded connectors; specifically, the threaded connectors are arranged to pass through the through holes on the connecting plate body 331 to realize the fixed connection with the carrier platform 41.

[0073] The above content is only an example of the specific solution of the present utility model. For the equipment and structures not described in detail therein, it should be understood that the existing general equipment and general methods in the art are adopted for implementation.

[0074] The above is only one solution of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A low scattering foam support for supporting a test target in a compact field, characterized in that: include: A foam support (1), an absorbing plate (2) mounted at the bottom of the foam support (1), and a posture adjustment platform (3) connected to the absorbing plate (2); The foam support (1) is a regular column, and comprises: a truncated cone column part (11) and a cylindrical part (12); The truncated cone column part (11) and the cylindrical part (12) are coaxially arranged, and the truncated cone column part (11) is arranged at the upper end of the cylindrical part (12); The wave absorbing plate (2) is connected to an end of the cylindrical part (12) away from the truncated cone column part (11), and the wave absorbing plate (2) covers the end of the cylindrical part (12).

2. The low-scattering foam bracket according to claim 1, characterized in that: The bottom end of the truncated cone column part (11) is arranged to be consistent with the upper end of the cylindrical part (12), and the truncated cone column part (11) and the cylindrical part (12) are bonded to each other.

3. The low scattering foam bracket according to claim 2, characterized in that: The truncated cone column part (11) comprises: a plurality of truncated cone column structures (111); From top to bottom, a plurality of the truncated cone column structures (111) are coaxially arranged in sequence; The end surfaces of adjacent truncated cone column structures (111) are arranged to be consistent.

4. The low scattering foam bracket according to claim 3, characterized in that: Along the direction from top to bottom, the height of the first truncated cone column structure (111) of the truncated cone column part (11) is smaller than the height of the remaining truncated cone column structures (111), and the heights of the remaining truncated cone column structures (111) are consistent.

5. The low-scattering foam bracket according to claim 4, characterized in that: Along the direction from top to bottom, the first truncated cone column structure (111) of the truncated cone column part (11) is detachable, and the remaining truncated cone column structures (111) are bonded to each other.

6. The low-scattering foam bracket according to claim 5, characterized in that: One end of the cylindrical portion (12) connected to the wave absorbing plate (2) is provided with a moving groove (121); A plurality of the transfer grooves (121) are arranged at intervals along the radial direction of the cylindrical portion (12).

7. The low-scattering foam bracket according to claim 6, characterized in that: The truncated cone column structure (111) and the cylindrical portion (12) are both polystyrene foam structures; The wave absorbing plate (2) is a PMI material plate, and the surface flatness of the wave absorbing plate (2) is ≤2 mm, and the parallelism of the upper and lower surfaces is ≤4 mm.

8. The low-scattering foam bracket according to any one of claims 1 to 7, characterized in that: The posture adjustment platform (3) comprises: a platform body (31), a rotating mechanism arranged inside the platform body (31), a platform surface (32) connected to the rotating mechanism, and a leveling structure (33) connected to the bottom of the platform body (31); The shape and size of the table top (32) are consistent with those of the wave absorbing plate (2), or the size of the table top (32) is smaller than the size of the wave absorbing plate (2); The wave absorbing plate (2) is detachably connected to the table top (32); The bottom end of the platform (31) is provided with an annular support (311); The leveling structure (33) is detachably connected to the annular support (311), and a plurality of the leveling structures (33) are arranged at equal intervals along the circumference of the annular support (311); The leveling structure (33) comprises: a connecting plate (331), and a leveling nut (332) connected to the leveling structure (33); The upper end of the leveling nut (332) is threadedly connected to the annular support (311), and the lower end of the leveling nut (332) is movably connected to the connecting plate body (331).

9. The low-scattering foam bracket according to claim 8, characterized in that: The posture adjustment platform (3) further comprises: a shielding screen (34); A high-angle pyramid wave absorbing structure is arranged on the outer side of the shielding screen (34); The shielding screen (34) is in a plate-shaped structure as a whole, and comprises: a first plate body part (341) and a second plate body part (342); The first plate portion (341) and the second plate portion (342) are arranged at an angle; The shielding screen (34) and the platform (31) are spaced apart, and the bent opening direction of the shielding screen (34) is opposite to the platform (31); In the vertical direction, the height of the shielding screen (34) is greater than or equal to the overall height of the posture adjustment platform (3); Along the horizontal direction, the projection size of the shielding screen (34) is greater than or equal to the overall radial size of the posture adjustment platform (3).

10. The low-scattering foam bracket according to claim 9, characterized in that: Also includes: A mobile carrier (4) for supporting the posture adjustment platform (3); The mobile carrier (4) comprises: a carrier platform (41) and a movable support (42) connected to the bottom of the carrier platform (41); The connecting plate body (331) is connected to the carrier platform (41) by means of a threaded connection.

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