Uniform coating assembly and system for coating and applying medicine to basement membrane

Abstract

The utility model discloses a uniform coating component and a uniform coating system for coating and applying a medicine to a base membrane, relates to the technical field of manufacturing of lithium battery diaphragms, and can solve the problem of poor uniformity during coating and applying the medicine to the base membrane in the prior art. The uniform coating component comprises a driving motor, a bearing seat rotationally connected to an output shaft of the driving motor, and a feeding hard pipe communicated with an external feeding pipeline, and the feeding hard pipe penetrates through the bearing seat and is fixed on the bearing seat; the material receiving disc and the atomizing wheel disc are fixedly connected to an output shaft of the driving motor and rotate synchronously, the material receiving disc is located in the atomizing wheel disc, the discharging end of the feeding hard pipe is located in the material receiving disc, a plurality of material leaking openings are formed in the bottom of the material receiving disc, and a plurality of evenly-distributed material throwing atomizing holes are formed in the periphery of the atomizing wheel disc. A plurality of first discharging openings are formed in the bottom of the atomization wheel disc.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery diaphragm manufacturing, in particular to a uniform coating component and system for coating a base film with medicine. Background Art

[0002] In the production process of lithium battery separators, after the base film is manufactured, it needs to be coated and dried by the coating and drug application system to form a semi-finished separator. After winding, it is transferred to the slitting system to be slit into small rolls of finished separators for subsequent lithium battery production.

[0003] Since lithium battery separators are the key core materials for lithium battery manufacturing and have high material requirements, the coating process of the base film is one of the key factors that determine the quality of the finished lithium battery separator. The existing coating device or system for the separator usually uses a coating machine to apply the drug and a coating roller to roll the coating. Since the base film needs to be dried after coating, and the base film needs to be coated on both sides, the length of the base film in the entire coating system is relatively large, and the overall length can reach more than 100 meters. At the coating position, the tension at various positions of the base film cross section is not uniform. When the coating roller is used for rolling, the uniformity of the base film after coating is not good. In particular, fine particles may appear in the drug slurry and are directly coated on the base film by the coating roller, resulting in defective sections of the diaphragm after drying, which need to be removed, and it is difficult to ensure the quality of the diaphragm after drying.

[0004] In view of the above background, the inventors have designed a uniform coating component and system for coating a base film with a drug to solve one or more of the above problems, and thus proposed the present application. Utility Model Content

[0005] The purpose of the present application is to provide a uniform coating component and system for coating a base film with medicine, so as to solve the problem of poor uniformity when coating the base film with medicine in the prior art.

[0006] In order to solve the above technical problems, the utility model adopts the following solutions:

[0007] One aspect of the present application provides a uniform coating assembly for coating a base film with a drug, comprising:

[0008] A driving motor, a bearing seat rotatably connected to an output shaft of the driving motor, and a feed pipe connected to an external feed pipe, wherein the feed pipe penetrates the bearing seat and is fixed to the bearing seat;

[0009] It also includes a receiving plate and an atomizing wheel plate which are fixedly connected to the output shaft of the driving motor and rotate synchronously, the receiving plate is located inside the atomizing wheel plate, and the discharge end of the feeding hard pipe is located inside the receiving plate, wherein:

[0010] A plurality of material leakage ports are arranged at the bottom of the material receiving plate, a plurality of evenly distributed material throwing atomization holes are arranged on the periphery of the atomizing wheel, and a plurality of first material discharge ports are arranged at the bottom of the atomizing wheel.

[0011] Preferably, it also includes a mounting flange for mounting the driving motor, the mounting flange is fixedly connected to the bearing seat, and the mounting flange is located on a side of the bearing seat away from the receiving tray;

[0012] The mounting flange is provided with a pipeline window, and the external feed pipeline is connected with the feed hard pipe through the pipeline window.

[0013] Preferably, the atomizing wheel is provided with a wheel baffle, and the material-throwing atomizing hole and the first material discharge port are located on the same side of the wheel baffle;

[0014] It also includes a wheel cover body fixedly connected to the output shaft of the driving motor and rotating synchronously, the wheel cover body is sleeved on the atomizing wheel disc, the wheel cover body is provided with a wheel cover rib parallel to the wheel disc rib, and the material throwing atomizing hole is located between the wheel disc rib and the wheel cover rib;

[0015] A plurality of second discharge ports are also arranged at the bottom of the wheel cover body.

[0016] Preferably, a locking bolt is also provided for locking and threadedly connecting the output shaft of the driving motor, and the receiving plate, the atomizing wheel disc and the wheel cover body are all detachably fixed to the output shaft of the driving motor by the locking bolt.

[0017] Another aspect of the present application provides a uniform coating system for coating a base film with a drug, comprising any of the uniform coating components for coating a base film with a drug as described above, as well as a box, a feeding component and a tensioning roller group, wherein the uniform coating component and the feeding component are both arranged in the box, and the tensioning roller group is located on the side of the box, wherein:

[0018] The box body is provided with a feed cavity, a motor installation cavity and an atomization cavity which are distributed up and down, and an atomization port is provided on the side of the atomization cavity facing the tensioning roller group;

[0019] The feed assembly is arranged in the feed cavity and is connected with the feed hard pipe of the uniform coating assembly;

[0020] There are multiple uniform coating assemblies, and the multiple uniform coating assemblies are evenly distributed in the box along the axial direction of the tensioning roller assembly. The driving motor of the uniform coating assembly is invertedly arranged in the motor mounting cavity, and the atomizing wheel discs of the multiple uniform coating assemblies are located in the atomizing cavity.

[0021] Preferably, the feed assembly includes a feed main pipe arranged in the feed cavity and connected to an external feeding device, and a plurality of feed branches evenly distributed on the feed main pipe. The number of the feed branches is the same as the number of the uniform coating assemblies, and each feed branch pipe is connected to the feed hard pipe of the uniform coating assembly.

[0022] Preferably, the tensioning roller set comprises a first tensioning roller and a second tensioning roller located above and below the mist outlet;

[0023] It also includes a return material assembly for recovering slurry, the return material assembly includes an upper return material pipe connected to the bottom of the atomization chamber, and a return material box arranged between the first tensioning roller and the second tensioning roller, and the return material box is provided with a return material port arranged toward the atomization port.

[0024] Preferably, the return material assembly further comprises a lower return material tray fixed to the bottom of the box body, and an upper return material tray located directly below the mist material outlet and arranged obliquely, wherein one side of the upper return material tray close to the lower return material tray is lower than the other side;

[0025] The lower return material tray is located below the upper return material tray, and the bottom of the lower return material tray is connected with a lower return material pipe.

[0026] Preferably, the bottom of the lower return material tray and the atomization chamber are both U-shaped or V-shaped.

[0027] Preferably, it also includes a driving cylinder and a crank arranged on the box body, and a revolving door located in the atomization chamber, the revolving door is rotatably connected to the box body through a rotating shaft thereon, the rotating shaft of the revolving door is arranged parallel to the axis of the tensioning roller group, one end of the crank is fixedly connected to the output end of the driving cylinder, and the other end is fixedly connected to the rotating shaft of the revolving door.

[0028] Beneficial effects of the utility model:

[0029] The present application drives the atomizing wheel fixed on its output end to rotate at high speed by driving the motor to rotate at high speed, so that after the slurry enters the receiving plate and the atomizing wheel from the feed hard pipe, the slurry is uniformly and quickly thrown out from the atomizing hole in the form of mist under the action of centrifugal force until it is thrown out from the mist port onto the diaphragm to complete the coating. Compared with traditional coating methods, the slurry is thrown out onto the diaphragm in the form of mist, which is more uniform. In addition, a plurality of first discharge ports are also provided at the bottom of the atomizing wheel in the present application, and the size of the first atomizing port is larger than the size of the atomizing hole, so that hard particles in the slurry that are larger than the size of the atomizing hole can be discharged through the first discharge port, thereby preventing the particles from being thrown out and coated on the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the exploded three-dimensional structure of Example 1 of the utility model;

[0031] Figure 2 This is a schematic diagram of the three-dimensional structure of the dispersion wheel in Example 1 of the utility model;

[0032] Figure 3 This is a schematic diagram of the main structure of Embodiment 1 of the present utility model;

[0033] Figure 4This is a schematic diagram of the three-dimensional structure of Example 2 of the utility model;

[0034] Figure 5 This is a schematic diagram of the three-dimensional structure of Example 2 of the utility model after removing the top plate and the rear side plate;

[0035] Figure 6 This is a schematic diagram of the main structure of Embodiment 2 of the present utility model;

[0036] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure of AA.

[0037] Description of reference numerals:

[0038] 11-driving motor, 12-mounting flange, 121-pipe window, 13-bearing seat, 14-receiving tray, 141-leakage port, 15-feeding hard pipe, 16-atomizing wheel disc, 161-first discharge port, 162-throwing atomizing hole, 163-wheel disc retaining edge, 17-wheel cover body, 171-second discharge port, 18-locking bolt; 2-box, 21-motor mounting cavity, 22-feeding cavity, 23-atomizing cavity, 231-atomizing port, 3-feeding main pipe, 31-feeding branch pipe, 41-first tensioning roller, 42-second tensioning roller, 5-return box, 51-return port, 61-upper return pipe, 62-upper return tray, 63-lower return tray, 64-lower return pipe, 71-driving cylinder, 72-crank, 73-revolving door. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0040] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection 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 the present invention can be understood according to specific circumstances.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0043] Embodiment 1:

[0044] Reference Figures 1 to 3 As shown, this embodiment provides a uniform coating component for coating a base film with a drug, comprising:

[0045] The driving motor 11 rotates a bearing seat 13 connected to the output shaft of the driving motor 11, and a feed pipe 15 connected to an external feed pipe, wherein the feed pipe 15 penetrates the bearing seat 13 and is fixed to the bearing seat 13;

[0046] It also includes a receiving tray 14 and an atomizing wheel 16 which are fixedly connected to the output shaft of the driving motor 11 and rotate synchronously therewith. The receiving tray 14 is located inside the atomizing wheel 16, and the discharge end of the feeding hard pipe 15 is located inside the receiving tray 14, wherein:

[0047] A plurality of material leakage ports 141 are provided at the bottom of the material receiving tray 14 , a plurality of evenly distributed material throwing atomization holes 162 are provided on the periphery of the atomizing wheel 16 , and a plurality of first material discharge ports 161 are provided at the bottom of the atomizing wheel 16 .

[0048] In this embodiment, the high-speed rotation of the driving motor 11 can drive the atomizing wheel 16 fixed on its output end to rotate at a high speed, so that the slurry can enter the receiving plate 14 from the feeding hard tube 15, and then enter the atomizing wheel 16 from the leakage port 141 of the receiving plate 14. Under the action of centrifugal force, the slurry can be uniformly and quickly thrown out from the throwing atomizing hole 162 in the form of mist, until it is thrown out from the mist port 231 onto the diaphragm to complete the coating. Compared with traditional coating methods, the slurry is thrown out onto the diaphragm in the form of mist, which is more uniform. In addition, a plurality of first discharge ports 161 are also provided at the bottom of the atomizing wheel 16 in the present application, and the size of the first atomizing port is larger than the size of the throwing atomizing hole 162, so that hard particles in the slurry larger than the size of the atomizing hole can be discharged through the first discharge port 161 to prevent the particles from being thrown out and coated on the diaphragm.

[0049] Specifically, in this embodiment, it also includes a mounting flange 12 for mounting the drive motor 11, the mounting flange 12 is fixedly connected to the bearing seat 13, and the mounting flange 12 is located on a side of the bearing seat 13 away from the receiving tray 14;

[0050] The mounting flange 12 is provided with a pipe window 121, and the external feed pipe is connected to the feed pipe 15 through the pipe window 121. In this embodiment, the size of the mounting flange 12 is larger than the size of the bearing seat 13, so the pipe window 121 is provided on the mounting flange 12, so the curvature of the feed pipe 15 can be reduced.

[0051] In some preferred exemplary embodiments, the atomizing wheel 16 is provided with a wheel baffle 163, and the material-throwing atomizing hole 162 and the first material discharge port 161 are located on the same side of the wheel baffle;

[0052] The wheel cover body 17 is fixedly connected to the output shaft of the driving motor 11 and rotates synchronously therewith. The wheel cover body 17 is mounted on the atomizing wheel disc 16. The wheel cover body 17 is provided with a wheel cover rib parallel to the wheel disc rib 163. The material throwing atomizing hole 162 is located between the wheel disc rib 163 and the wheel cover rib.

[0053] A plurality of second discharge ports 171 are also provided at the bottom of the wheel cover body 17 .

[0054] In this embodiment, since the atomizing wheel 16 is provided with a wheel wheel guard 163, the wheel cover body 17 is provided with a wheel cover guard, and the material throwing atomizing hole 162 is located between the wheel wheel guard 163 and the wheel cover guard, the atomized slurry is only thrown out from between the wheel edge and the wheel cover guard, and the atomized slurry can be restricted to a certain extent in the vertical direction, ensuring stable and uniform spraying of the diaphragm.

[0055] In some preferred embodiments, a locking bolt 18 is provided for locking and threading the output shaft of the drive motor 11, and the receiving plate 14, the atomizing wheel plate 16 and the wheel cover body 17 are all detachably fixed to the output shaft of the drive motor 11 by the locking bolt 18. By providing the locking bolt 18, the subsequent disassembly and maintenance of the atomizing wheel plate 16, the receiving plate 14, the wheel cover body 17 and other parts can be facilitated.

[0056] Embodiment 2:

[0057] like Figures 4 to 7 As shown, based on the above embodiment 1, this embodiment provides: a uniform coating system for coating a base film with a drug, comprising any of the above uniform coating components for coating a base film with a drug, as well as a box 2, a feeding component and a tensioning roller group, wherein the uniform coating component and the feeding component are both arranged in the box 2, and the tensioning roller group is located on the side of the box 2, wherein:

[0058] The box body 2 has a feed cavity 22, a motor installation cavity 21 and an atomization cavity 23 distributed vertically, and an atomization cavity 23 is provided with an atomization material port 231 on one side of the atomization cavity 23 facing the tensioning roller group;

[0059] The feed assembly is disposed in the feed cavity 22 and communicates with the feed hard pipe 15 of the uniform coating assembly;

[0060] There are multiple uniform coating assemblies, and the multiple uniform coating assemblies are evenly distributed in the box body 2 along the axial direction of the tensioning roller assembly. The driving motor 11 of the uniform coating assembly is invertedly arranged in the motor mounting cavity 21, and the atomizing wheel discs 16 of the multiple uniform coating assemblies are located in the atomizing cavity 23.

[0061] By providing multiple uniform spraying assemblies and uniformly distributing the multiple uniform spraying assemblies along the axial direction of the tensioning roller assembly, the atomized slurry formed by the multiple uniform spraying assemblies can be uniformly sprayed from the atomizing material port 231, thereby avoiding unevenness caused by diffusion of the atomized slurry.

[0062] The driving motor 11 in this embodiment is a direct-drive high-speed motor.

[0063] In some preferred embodiments, the feed assembly includes a feed main pipe 3 disposed in the feed cavity 22 and connected to an external feed device, and a plurality of feed branch pipes 31 evenly distributed on the feed main pipe 3. The number of the feed branch pipes 31 is the same as the number of the uniform coating assembly, and each feed branch pipe 31 is connected to the feed hard pipe 15 of the uniform coating assembly. Each uniform coating assembly is fed separately through each feed branch pipe 31.

[0064] In some preferred embodiments, the tension roller set includes a first tension roller 41 and a second tension roller 42 located above and below the mist outlet 231;

[0065] It also includes a return assembly for recovering the slurry, which includes an upper return pipe 61 connected to the bottom of the atomizing chamber 23, and a return box 5 arranged between the first tensioning roller 41 and the second tensioning roller 42, and the return box 5 is provided with a return port 51 arranged toward the atomizing port 231. By setting the return assembly, the slurry that is not sprayed onto the diaphragm after atomization can be recovered, especially, the slurry atomized by the uniform coating assembly is evenly dispersed from its surroundings, and a considerable part of the slurry is not thrown onto the diaphragm. Therefore, by setting the upper return pipe 61 and the return box 5, the waste of slurry can be avoided. In this embodiment, the width of the return port 51 of the return box 5 is greater than the width of the diaphragm.

[0066] In some preferred embodiments, the return material assembly further includes a lower return material tray 63 fixed to the bottom of the box body 2, and an upper return material tray 62 located directly below the mist material port 231 and arranged obliquely, and one side of the upper return material tray 62 close to the lower return material tray 63 is lower than the other side;

[0067] The lower return material tray 63 is located below the upper return material tray 62 , and the bottom of the lower return material tray 63 is connected with a lower return material pipe 64 , which can further avoid slurry waste.

[0068] In some preferred embodiments, the bottom of the lower return plate 63 and the bottom of the atomization chamber 23 are both U-shaped or V-shaped, so that the slurry can be recovered in time to avoid slurry accumulation.

[0069] In some preferred embodiments, it also includes a driving cylinder 71 and a crank 72 disposed on the housing 2, and a revolving door 73 located in the atomizing chamber 23. The revolving door 73 is rotatably connected to the housing 2 via a rotating shaft thereon, and the rotating shaft of the revolving door 73 is arranged parallel to the axis of the tensioning roller group. One end of the crank 72 is fixedly connected to the output end of the driving cylinder 71, and the other end is fixedly connected to the rotating shaft of the revolving door 73. Since the slurry in the recycle box 5 needs to be regularly recovered by the operator, by providing the driving cylinder 71, the crank 72 and the revolving door 73, the present embodiment can recover the slurry in the recycle box 5 without shutting down the uniform coating assembly, thereby avoiding frequent starting and stopping of the driving motor 11 of the uniform coating assembly.

[0070] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A uniform coating component for coating a base film with a drug, characterized in that: include: A driving motor (11), a bearing seat (13) rotatably connected to an output shaft of the driving motor (11), and a feed pipe (15) connected to an external feed pipe, wherein the feed pipe (15) penetrates the bearing seat (13) and is fixed to the bearing seat (13); It also includes a material receiving tray (14) and an atomizing wheel (16) which are fixedly connected to the output shaft of the driving motor (11) and rotate synchronously therewith, the material receiving tray (14) being located inside the atomizing wheel (16), and the material discharge end of the feeding hard pipe (15) being located inside the material receiving tray (14), wherein: A plurality of material leakage openings (141) are arranged at the bottom of the material receiving plate (14), a plurality of evenly distributed material throwing atomization holes (162) are arranged on the periphery of the atomizing wheel (16), and a plurality of first material discharge openings (161) are arranged at the bottom of the atomizing wheel (16).

2. The uniform coating assembly for coating the base film with medicine according to claim 1, characterized in that: It also includes a mounting flange (12) for mounting the drive motor (11), the mounting flange (12) being fixedly connected to the bearing seat (13), and the mounting flange (12) being located on a side of the bearing seat (13) away from the receiving tray (14); The mounting flange (12) is provided with a pipeline window (121), and an external feed pipeline is connected to the feed hard pipe (15) through the pipeline window (121).

3. The uniform coating assembly for coating the base film with medicine according to claim 1, characterized in that: The atomizing wheel (16) is provided with a wheel baffle (163), and the material-throwing atomizing hole (162) and the first material discharge port (161) are located on the same side of the wheel baffle; It also includes a wheel cover body (17) fixedly connected to the output shaft of the driving motor (11) and rotating synchronously therewith, the wheel cover body (17) being mounted on the atomizing wheel disc (16), the wheel cover body (17) being provided with a wheel cover rib arranged parallel to the wheel disc rib (163), and the material throwing atomizing hole (162) being located between the wheel disc rib (163) and the wheel cover rib; A plurality of second discharge openings (171) are also provided at the bottom of the wheel cover body (17).

4. The uniform coating assembly for coating the base film with medicine according to claim 1, characterized in that: A locking bolt (18) is also provided for locking and threadedly connecting the output shaft of the drive motor (11), and the material receiving plate (14), the atomizing wheel disc (16) and the wheel cover body (17) are all detachably fixed to the output shaft of the drive motor (11) via the locking bolt (18).

5. A uniform coating system for coating the base film with medicine, characterized in that: The invention comprises a uniform coating assembly for coating a base film with a drug as claimed in any one of claims 1 to 4, as well as a box body (2), a feed assembly and a tension roller group, wherein the uniform coating assembly and the feed assembly are both arranged in the box body (2), and the tension roller group is located on the side of the box body (2), wherein: The box body (2) has a feed cavity (22), a motor installation cavity (21) and an atomization cavity (23) distributed vertically, and a side of the atomization cavity (23) facing the tensioning roller group is provided with an atomization cavity (231); The feed assembly is arranged in the feed cavity (22) and is connected to the feed hard pipe (15) of the uniform coating assembly; There are multiple uniform coating assemblies, and the multiple uniform coating assemblies are evenly distributed in the box body (2) along the axial direction of the tension roller assembly. The drive motor (11) of the uniform coating assembly is invertedly arranged in the motor installation cavity (21), and the atomizing wheel discs (16) of the multiple uniform coating assemblies are located in the atomizing cavity (23).

6. The uniform coating system for coating a base film with a drug according to claim 5, characterized in that: The feed assembly comprises a feed main pipe (3) arranged in a feed cavity (22) and connected to an external feed device, and a plurality of feed branch pipes (31) evenly distributed on the feed main pipe (3), wherein the number of the feed branch pipes (31) is the same as the number of the uniform coating assembly, and each feed branch pipe (31) is connected to the feed hard pipe (15) of the uniform coating assembly.

7. The uniform coating system for coating a base film with a drug according to claim 5, characterized in that: The tensioning roller set comprises a first tensioning roller (41) and a second tensioning roller (42) located above and below the mist outlet (231); The invention also comprises a material return assembly for recovering slurry, the material return assembly comprising an upper material return pipe (61) connected to the bottom of the atomization chamber (23), and a material return box (5) arranged between the first tensioning roller (41) and the second tensioning roller (42), the material return box (5) being provided with a material return port (51) arranged toward the atomization port (231).

8. The uniform coating system for coating a base film with a drug according to claim 7, characterized in that: The return material assembly further comprises a lower return material tray (63) fixed to the bottom of the box body (2), and an upper return material tray (62) located directly below the mist material port (231) and arranged obliquely, wherein one side of the upper return material tray (62) close to the lower return material tray (63) is lower than the other side; The lower return material tray (63) is located below the upper return material tray (62), and the bottom of the lower return material tray (63) is connected to a lower return material pipe (64).

9. The uniform coating system for coating a base film with a drug according to claim 8, characterized in that: The bottoms of the lower return material tray (63) and the atomization chamber (23) are both U-shaped or V-shaped.

10. The uniform coating system for coating a base film with a drug according to claim 5, characterized in that: It also comprises a driving cylinder (71) and a crank (72) arranged on the housing (2), and a rotating door (73) located in the atomizing chamber (23); the rotating door (73) is rotatably connected to the housing (2) via a rotating shaft thereon; the rotating shaft of the rotating door (73) is arranged parallel to the axis of the tensioning roller group; one end of the crank (72) is fixedly connected to the output end of the driving cylinder (71), and the other end is fixedly connected to the rotating shaft of the rotating door (73).

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