Anechoic chamber hoist crane covering acoustic structure

Abstract

The invention belongs to the technical field of acoustics, and discloses an anechoic chamber hoist crane covering acoustic structure which comprises an acoustic transmission perforated plate lower portion, acoustic transmission perforated plate side portions are symmetrically distributed at the two ends of the acoustic transmission perforated plate lower portion, a hanging rod is fixedly connected to the middle of the top of the acoustic transmission perforated plate lower portion, and a hanging ring is fixedly installed at the top of the hanging rod. The two side walls of the top end of the hanging rod are fixedly connected with balance supporting rods. Compared with a traditional hoist crane which is exposed at the top of an anechoic chamber, the hoist crane has the advantages that through the arrangement of the lower part of the sound-transmitting perforated plate and the side part of the sound-transmitting perforated plate, the design of the structure and the material, and the arrangement of the suspender, the hoisting ring and the balance supporting rod, the hoisting efficiency is improved; the whole device has the advantages of being simple in structure, convenient and fast to install and use, perfect in appearance and high in integrating degree with the anechoic chamber, the sound field environment of the anechoic chamber is guaranteed, meanwhile, the requirement for hoisting of the anechoic chamber can be met, and therefore the using effect of the anechoic chamber is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of acoustic technology, and more specifically, to an acoustic structure for covering a hoist in an anechoic chamber. Background Art

[0002] The anechoic chamber is not only a special laboratory for acoustic testing, but also an important part of the testing system. In fact, it is also one of the acoustic testing equipment. Its acoustic performance indicators directly affect the accuracy of the test. The main purpose of the anechoic chamber is to test the electroacoustic properties of the noise transmitter and receiver, such as sensitivity, frequency response and directionality.

[0003] At present, when constructing an anechoic chamber, it is often necessary to install a lifting hoist on the top of the anechoic chamber due to the need for lifting and hoisting, and the anechoic wedge at the installation position of the lifting hoist is replaced by the lifting hoist. However, the lifting hoist is currently exposed to the outside, which will cause sound wave reflection problems and affect the sound field environment of the anechoic chamber, thereby affecting the use effect of the anechoic chamber.

[0004] In order to solve the above problems, the present application provides an acoustic structure for shielding a hoist in an anechoic chamber. Summary of the invention

[0005] The present application provides an anechoic chamber hoisting hoisting acoustic structure that adopts the following technical solution:

[0006] A hoisting hoist acoustic structure for covering an anechoic chamber comprises a lower part of a sound-transmitting perforated plate, the two ends of the lower part of the sound-transmitting perforated plate are symmetrically distributed with side parts of the sound-transmitting perforated plate, a suspension rod is fixedly connected to the middle position of the top of the lower part of the sound-transmitting perforated plate, a suspension ring is fixedly installed on the top of the suspension rod, both side walls of the top of the suspension rod are fixedly connected with balance support rods, and the bottom ends of the two balance support rods are fixedly connected to the top of the lower part of the sound-transmitting perforated plate, a bottom cover is arranged at the middle position of the bottom of the lower part of the sound-transmitting perforated plate, a rotating rod is distributed at the center of the inner side of the bottom cover, and the outer part of the middle of the rotating rod A groove is provided in the wall-embedded part, and the outer wall in the middle of the rotating rod is rotatably sleeved with a limit seat through the groove, and the limit seat is fixedly installed at the bottom of the lower part of the sound-transmitting perforated plate, and the outer walls on both sides of the rotating rod are symmetrically distributed with thread grooves, and both sides of the rotating rod are symmetrically screwed with threaded tubes through the thread grooves, and the two threaded tubes are respectively slidably sleeved in the inner cavity at both ends of the bottom cover, and the opposite ends of the two threaded tubes are fixedly connected with connecting plates, and the two connecting plates are respectively fixedly installed at the bottom of the side parts of the two sound-transmitting perforated plates, and a driving structure is provided at the outer end of one side in the middle of the rotating rod.

[0007] Through the above technical solution, the bottom cover can support and protect the inner structure.

[0008] Furthermore, the driving structure includes a first bevel gear, a second bevel gear and an I-shaped shaft, the first bevel gear is fixedly sleeved and installed on an outer wall of one side of the middle part of the rotating rod, and the first bevel gear is located on one side of the groove, the I-shaped shaft is through-rotatably sleeved and installed on the center position of the bottom end of the bottom cover, the second bevel gear is vertically meshed with the bottom end of the first bevel gear, and the second bevel gear is fixedly sleeved and installed on the outer surface of the upper side of the I-shaped shaft.

[0009] Through the above technical solution, the driving structure can drive the rotating rod to rotate.

[0010] Furthermore, a plurality of shifting bars are evenly and fixedly mounted on the circumference of the outer surface of the lower side of the I-shaped shaft, and the plurality of shifting bars are all located on the outer side of the bottom end of the bottom cover.

[0011] Through the above technical solution, the pull bar facilitates the manual screwing operation of the I-shaped shaft.

[0012] Furthermore, plug-in grooves are symmetrically provided on both sides of the lower part of the sound-permeable perforated plate, and the inner walls of the plug-in grooves on both sides are slidably sleeved with extension parts, and the extension parts on both sides are respectively fixedly installed on the opposite end faces of the bottom ends of the side parts of the two sound-permeable perforated plates.

[0013] Through the above technical solution, the plug-in groove and the extension part realize the limiting cooperation between the lower part of the sound-permeable perforated plate and the side part of the sound-permeable perforated plate, and at the same time, realize the sound insulation effect of the spacing position when the two are separated.

[0014] Furthermore, a sealing sleeve is fixedly mounted on the inner wall of one side of the plug-in slot near the side of the sound-transmitting perforated plate, and the inner wall of the sealing sleeve is in sliding contact with the outer surface of the extension portion. The bottom of the two sides of the sound-transmitting perforated plates are rectangular and jointly fixed with four pads.

[0015] Through the above technical solution, the sealing sleeve can improve the sealing effect of the matching position between the plug-in slot and the extension portion.

[0016] Furthermore, the lower part of the sound-permeable perforated plate and the two side parts and the extension part of the sound-permeable perforated plate are all plate structures with consistent materials, and the lower part of the sound-permeable perforated plate and the two side parts and the extension part of the sound-permeable perforated plate are internally provided with sound-absorbing materials.

[0017] Furthermore, the lower part of the sound-permeable perforated plate and the two sides and extensions of the sound-permeable perforated plate are all made of high-porosity materials, and the sound-absorbing material is glass wool material or fiber, BASF, polyester wool and other materials with high sound absorption rate.

[0018] Through the above technical solution, the overall shielding and sound insulation effect can be improved by designing the materials of the lower part, the side part and the extension part of the sound-transmitting perforated plate.

[0019] Furthermore, the bottom cover includes a front cover body and a rear cover body which are distributed in a front-to-back contact manner, a first circular hole is commonly opened at the center position of the bottom end of the front cover body and the rear cover body, and the first circular hole is rotatably sleeved and adapted with the middle part of the I-shaped shaft, and second circular holes are commonly opened in the inner cavities at both ends of the front cover body and the rear cover body, and the two second circular holes are respectively slidably sleeved and adapted with two threaded cylinders.

[0020] Through the above technical solution, the design of the two parts of the bottom cover can facilitate the disassembly work when necessary.

[0021] Furthermore, a plurality of first ear blocks and second ear blocks are linearly fixedly installed near the bottom of the front cover body and the rear cover body, each of the first ear block and the second ear block is in contact with each other, and a screw is threadedly installed at the connection between the inner cavity of each first ear block and the second ear block.

[0022] Furthermore, the outer surface of the top end of the side opposite to the front cover body and the rear cover body is fixed with four fixing blocks in a rectangular shape, and the inner cavity of each fixing block is installed with a fixing bolt, and each fixing block is fixedly screwed to the bottom position of the lower part of the sound-permeable perforated plate by the fixing bolt.

[0023] Through the above technical solution, the arrangement of each first ear block, second ear block, screw member, fixing block and fixing bolt can facilitate the assembly and fixation of the two parts of the bottom cover and the overall fixing and assembly function.

[0024] In summary, this application includes the following beneficial technical effects:

[0025] (1) The present application adopts the lower part and the side part of the sound-transmitting perforated plate, and utilizes the design of the structure and materials thereof, in combination with the suspension rod, the lifting ring, and the balance support rod, so that compared with the traditional lifting hoist exposed on the top of the anechoic chamber, the overall structure is simple, easy to install and use, perfect in appearance, and highly compatible with the anechoic chamber. In addition, the present application ensures that the sound field environment of the anechoic chamber is met, and at the same time, the requirements of the lifting and hoisting of the anechoic chamber are met, thereby ensuring the use effect of the anechoic chamber.

[0026] (2) The present application arranges a bottom cover, a rotating rod, a groove, a limit seat, a threaded groove, a threaded tube, a connecting plate and a driving structure at the bottom of the lower part of the sound-transmitting perforated plate and the bottom of the side of the sound-transmitting perforated plate, so that the plug-in groove, the extension part and the sealing sleeve arranged between the lower part of the sound-transmitting perforated plate and the side of the sound-transmitting perforated plate can be extended, adjusted and positioned at the two ends of the lower part of the sound-transmitting perforated plate, so as to effectively adjust the lateral range of action of the body-masking acoustic structure, thereby further improving the overall use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1This is a schematic diagram of the overall structure of this application;

[0028] Figure 2 It is an overall internal cross-sectional view of the present application;

[0029] Figure 3 For this application Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 For this application Figure 2 Enlarged view of point B in the middle;

[0031] Figure 5 This is a schematic diagram of the bottom cover structure of this application;

[0032] Figure 6 This is a schematic diagram of the I-shaped shaft structure of this application;

[0033] Figure 7 This is one of the installation and use diagrams for this application;

[0034] Figure 8 This is the second installation and use diagram of this application.

[0035] Description of the numbers in the figure:

[0036] 1. Lower part of the sound-permeable perforated plate; 2. Side part of the sound-permeable perforated plate; 3. Hanging rod; 4. Lifting ring; 5. Balance support rod; 6. Bottom cover; 61. Front cover body; 62. Rear cover body; 63. First ear block; 64. Second ear block; 65. Screw; 66. Fixing block; 67. Fixing bolt; 7. Rotating rod; 8. Groove; 9. Limit seat; 10. Threaded cylinder; 11. Connecting plate; 12. First bevel gear; 13. Second bevel gear; 14. I-shaped shaft; 1401. Pick-up bar; 15. Plug-in slot; 16. Extension part; 17. Sealing sleeve; 18. Pad rod. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0038] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Example:

[0041] The present application embodiment discloses an acoustic structure for covering a hoist in an anechoic chamber, see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 , comprising a sound-transmitting perforated plate lower part 1, with sound-transmitting perforated plate side parts 2 symmetrically distributed at both ends of the sound-transmitting perforated plate lower part 1, and a suspension rod 3 is fixedly connected to the middle position of the top of the sound-transmitting perforated plate lower part 1, and a suspension ring 4 is fixedly installed on the top of the suspension rod 3, and both side walls of the top of the suspension rod 3 are fixedly connected to balance support rods 5, and the bottom ends of the two balance support rods 5 are fixedly connected to the top of the sound-transmitting perforated plate lower part 1, and a bottom cover 6 is arranged at the middle position of the bottom of the sound-transmitting perforated plate lower part 1, and a rotating rod 7 is distributed at the center of the inner side of the bottom cover 6, and a groove 8 is embedded in the outer wall of the middle of the rotating rod 7, The outer wall in the middle of the rotating rod 7 is rotatably sleeved with a limit seat 9 through a groove 8, and the limit seat 9 is fixedly installed at the bottom of the lower part 1 of the sound-transmitting perforated plate. The outer walls on both sides of the rotating rod 7 are symmetrically distributed with thread grooves, and both sides of the rotating rod 7 are symmetrically screwed with threaded tubes 10 through the thread grooves. The two threaded tubes 10 are respectively slidably sleeved in the inner cavities at both ends of the bottom cover 6, and the opposite ends of the two threaded tubes 10 are fixedly connected with connecting plates 11, and the two connecting plates 11 are respectively fixedly installed at the bottoms of the two side parts 2 of the sound-transmitting perforated plates. A driving structure is provided at the outer end of one side in the middle of the rotating rod 7.

[0042] The driving structure includes a first bevel gear 12, a second bevel gear 13 and an I-shaped shaft 14. The first bevel gear 12 is fixedly sleeved and installed on an outer wall of one side of the middle part of the rotating rod 7, and the first bevel gear 12 is located on one side of the groove 8. The I-shaped shaft 14 is rotatably sleeved through the center position of the bottom end of the bottom cover 6. The second bevel gear 13 is vertically meshed with the bottom end of the first bevel gear 12, and the second bevel gear 13 is fixedly sleeved and installed on the outer surface of the upper side of the I-shaped shaft 14. A plurality of shifting bars 1401 are evenly fixedly installed on the outer surface of the lower side of the I-shaped shaft 14, and the plurality of shifting bars 1401 are all located on the outer side of the bottom end of the bottom cover 6.

[0043] The two sides of the lower part 1 of the sound-permeable perforated plate are symmetrically provided with plug-in grooves 15, and the inner walls of the plug-in grooves 15 on both sides are slidably sleeved with extensions 16, and the extensions 16 on both sides are respectively fixedly installed on the end faces opposite to the bottom ends of the two sound-permeable perforated plate side parts 2, and the inner peripheral wall of the plug-in groove 15 on one side close to the sound-permeable perforated plate side part 2 is fixedly sleeved with a sealing sleeve 17, and the inner side wall of the sealing sleeve 17 is in sliding contact with the outer surface of the extension 16, and the bottom of the two sound-permeable perforated plate side parts 2 is rectangular and fixedly installed with four pads 18, and the lower part 1 of the sound-permeable perforated plate and the two sound-permeable perforated plate side parts 2 and the extensions 16 are The plate body structure is consistent with the material, and the lower part 1 of the sound-transmitting perforated plate and the two side parts 2 of the sound-transmitting perforated plate and the extension part 16 are all provided with sound-absorbing materials. The lower part 1 of the sound-transmitting perforated plate and the two side parts 2 of the sound-transmitting perforated plate and the extension part 16 are all high-porosity materials, and the sound-absorbing materials are glass wool materials or fiber, BASF, polyester wool high-sound-absorbing materials. Among them, the high-porosity materials can not reflect sound waves and have a strong absorption effect on sound waves, so they are also a good protective layer for the sound-absorbing materials, and the glass wool materials or fiber, BASF, polyester wool high-sound-absorbing materials can also have a good sound absorption effect on sound waves.

[0044] See also Figure 1 , Figure 2 and Figure 5 The bottom cover 6 includes a front cover body 61 and a rear cover body 62 which are arranged in front-to-back contact. A first circular hole is provided at the center of the bottom ends of the front cover body 61 and the rear cover body 62, and the first circular hole is rotatably sleeved and adapted with the middle part of the I-shaped shaft 14. Second circular holes are provided at the inner cavities at both ends of the front cover body 61 and the rear cover body 62, and the two second circular holes are respectively slidably sleeved and adapted with the two threaded tubes 10.

[0045] A plurality of first ear blocks 63 and second ear blocks 64 are linearly fixedly installed near the bottom of the front cover body 61 and the rear cover body 62, respectively. Each first ear block 63 and the second ear block 64 are in contact with each other, and a screw 65 is screwed and installed at the connection of the inner cavity of each first ear block 63 and the second ear block 64. Four fixing blocks 66 are fixedly installed in a rectangular shape on the outer surface of the top of the opposite side of the front cover body 61 and the rear cover body 62. A fixing bolt 67 is installed in the inner cavity of each fixing block 66, and each fixing block 66 is fixedly screwed and installed at the bottom position of the lower part 1 of the sound-permeable perforated plate by the fixing bolt 67. Among them, through the split design of the front cover body 61 and the rear cover body 62 on the bottom cover 6, The first circular hole and the second circular hole jointly opened between the two can realize stable support of the inner structure while not affecting the rotation of the I-shaped shaft 14 and the sliding of the threaded tube 10. The first ear block 63, the second ear block 64, the screw 65 (including the mounting screw and the locking nut) and the fixing block 66 and the fixing bolt 67 on the front cover body 61 and the rear cover body 62 can realize the docking and fixing between the front cover body 61 and the rear cover body 62, and realize the fixed assembly function of the two at the bottom of the lower part 1 of the sound-permeable perforated plate, and the front cover body 61 and the rear cover body 62 can be separated and disassembled when necessary, which can facilitate the inspection and maintenance of the inner structure of the bottom cover 6.

[0046] The implementation principle of the embodiment of the present application is: when in use, the whole is in a complete assembly state, referring to Figure 7 and Figure 8 , the hoisting ring 4 is used to fit with the hook on the hoisting hoist in the anechoic chamber, and at this time, the sling on the hoisting hoist cooperates with the hook, and the overall shielding acoustic structure can be adjusted in a vertical hoisting manner, and the shielding and sound insulation effect of the hoisting hoist can be achieved;

[0047] When it is necessary to adjust the lateral range of the overall acoustic shielding structure, it is only necessary to use each lever 1401 to screw the I-shaped shaft 14 to drive the second bevel gear 13 to rotate. Due to the meshing state of the second bevel gear 13 and the first bevel gear 12, the rotating rod 7 can be indirectly driven to rotate, so that the threaded tubes 10 on both sides move away from each other, thereby pushing the connecting plates 11 on both sides and the side parts 2 of the sound-transmitting perforated plate to adjust their positions away from each other on both sides of the lower part 1 of the sound-transmitting perforated plate, thereby realizing the adjustment operation of the lateral range of action of the overall acoustic shielding structure. During the adjustment process, the side parts 2 of the sound-transmitting perforated plates on both sides respectively drive the two extension parts 16 to slide and extend in cooperation inside the plug-in groove 15, and the limit seat 9 realizes the rotational limit receiving function of the rotating rod 7 through the groove 8 on the outer wall of the middle part of the rotating rod 7.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An acoustic structure for hoisting in an anechoic chamber, comprising a lower part (1) of a sound-permeable perforated plate, characterized in that: The two ends of the lower part (1) of the sound-permeable perforated plate are symmetrically provided with side parts (2) of the sound-permeable perforated plate, and a suspension rod (3) is fixedly connected to the middle position of the top of the lower part (1) of the sound-permeable perforated plate, and a suspension ring (4) is fixedly installed on the top of the suspension rod (3), and the two side walls of the top of the suspension rod (3) are fixedly connected with balance support rods (5), and the bottom ends of the two balance support rods (5) are fixedly connected to the top of the lower part (1) of the sound-permeable perforated plate, and a bottom cover (6) is arranged at the middle position of the bottom of the lower part (1) of the sound-permeable perforated plate, and a rotating rod (7) is distributed at the center of the inner side of the bottom cover (6), and a groove (8) is embedded in the outer wall of the middle part of the rotating rod (7), and the rotating rod The outer wall of the middle part (7) is rotatably sleeved with a limit seat (9) through a groove (8), and the limit seat (9) is fixedly installed at the bottom of the lower part (1) of the sound-transmitting perforated plate. The outer walls on both sides of the rotating rod (7) are symmetrically distributed with thread grooves, and both sides of the rotating rod (7) are symmetrically screwed with threaded cylinders (10) through the thread grooves. The two threaded cylinders (10) are respectively slidably sleeved in the inner cavities at both ends of the bottom cover (6), and the opposite ends of the two threaded cylinders (10) are fixedly connected with connecting plates (11), and the two connecting plates (11) are respectively fixedly installed at the bottom of the two side parts (2) of the sound-transmitting perforated plates. A driving structure is arranged at one outer end of the middle part of the rotating rod (7).

2. The acoustic structure of a hoisting hoist in an anechoic chamber according to claim 1, characterized in that: The driving structure comprises a first bevel gear (12), a second bevel gear (13) and an I-shaped shaft (14); the first bevel gear (12) is fixedly sleeved and installed on an outer wall of one side of the middle of the rotating rod (7), and the first bevel gear (12) is located on one side of the groove (8); the I-shaped shaft (14) is rotatably sleeved through the center position of the bottom end of the bottom cover (6); the second bevel gear (13) is vertically meshed with the bottom end of the first bevel gear (12), and the second bevel gear (13) is fixedly sleeved and installed on the outer surface of the upper side of the I-shaped shaft (14).

3. The acoustic structure of a hoist in an anechoic chamber according to claim 2, characterized in that: A plurality of shifting bars (1401) are evenly and fixedly mounted on the outer surface of the lower side of the I-shaped shaft (14), and the plurality of shifting bars (1401) are all located on the outer side of the bottom end of the bottom cover (6).

4. The acoustic structure of a hoist in an anechoic chamber according to claim 1, characterized in that: The lower part (1) of the sound-permeable perforated plate is symmetrically provided with plug-in grooves (15) on both sides, and the inner walls of the plug-in grooves (15) on both sides are slidably sleeved with extension parts (16), and the extension parts (16) on both sides are respectively fixedly installed on the opposite end surfaces of the bottom ends of the two sound-permeable perforated plate side parts (2).

5. The acoustic structure of a hoist in an anechoic chamber according to claim 4, characterized in that: A sealing sleeve (17) is fixedly sleeved and installed on the inner peripheral wall of one side of the plug-in slot (15) close to the side portion (2) of the sound-transmitting perforated plate, and the inner side wall of the sealing sleeve (17) is in sliding contact with the outer surface of the extension portion (16). The bottoms of the two side portions (2) of the sound-transmitting perforated plate are fixedly installed with four pads (18) in a rectangular shape.

6. The acoustic structure of a hoisting hoist in an anechoic chamber according to claim 5, characterized in that: The lower part (1) of the sound-transmitting perforated plate, the two side parts (2) of the sound-transmitting perforated plate, and the extension part (16) are all plate structures made of the same material, and sound-absorbing materials are arranged inside the lower part (1) of the sound-transmitting perforated plate, the two side parts (2) of the sound-transmitting perforated plate, and the extension part (16).

7. The acoustic structure of a hoist in an anechoic chamber according to claim 6, characterized in that: The lower part (1) of the sound-permeable perforated plate, the two side parts (2) of the sound-permeable perforated plate, and the extension part (16) are all made of materials with high porosity, and the sound-absorbing material is glass wool material or fiber, BASF, polyester wool material with high sound absorption rate.

8. The acoustic structure of a hoist in an anechoic chamber according to claim 2, characterized in that: The bottom cover (6) comprises a front cover body (61) and a rear cover body (62) which are arranged in a front-to-back contact manner. A first circular hole is provided at the center of the bottom ends of the front cover body (61) and the rear cover body (62), and the first circular hole is rotatably sleeved and adapted to the middle part of the I-shaped shaft (14). Second circular holes are provided at the inner cavities at both ends of the front cover body (61) and the rear cover body (62), and the two second circular holes are respectively slidably sleeved and adapted to the two threaded cylinders (10).

9. The acoustic structure of a hoisting hoist in an anechoic chamber according to claim 8, characterized in that: A plurality of first ear blocks (63) and second ear blocks (64) are linearly fixedly installed at positions close to the bottom of the front cover body (61) and the rear cover body (62), and each of the first ear blocks (63) and the second ear blocks (64) are in contact with each other, and a screw member (65) is threadedly installed at the connection between the inner cavities of each of the first ear blocks (63) and the second ear blocks (64).

10. The acoustic structure of a hoist in an anechoic chamber according to claim 8, characterized in that: Four fixing blocks (66) are fixedly installed in a rectangular shape on the outer surfaces of the top ends of the front cover body (61) and the rear cover body (62) opposite to each other. A fixing bolt (67) is installed in the inner cavity of each fixing block (66), and each fixing block (66) is fixedly screwed to the bottom position of the lower part (1) of the sound-permeable perforated plate by means of the fixing bolt (67).

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