Mechanical and electrical engineering electronic equipment maintenance cleaning mechanism

By combining a cleaning brush with a vacuum fan, the problem of dust pollution and incomplete cleaning is solved, achieving efficient and energy-saving cleaning of electronic equipment and extending the service life of the driven impeller.

CN224525399UActive Publication Date: 2026-07-21ZHENGZHOU DAXUAN ELECTRONICS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHENGZHOU DAXUAN ELECTRONICS TECH CO LTD
Filing Date
2025-08-25
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

When existing electromechanical engineering electronic equipment maintenance and cleaning organizations use air blowing methods, dust can easily pollute the surrounding environment and may fall back onto the equipment, resulting in incomplete cleaning and unsatisfactory cleaning results.

Method used

The design combines a cleaning brush with a vacuum fan. Dust is sucked up through the suction holes, and the cleaning brush is rotated by the driven impeller and transmission rod. Combined with the flow chamber and dust filter material, dust is effectively collected and cleaned.

Benefits of technology

It effectively prevents dust from floating and polluting the environment, improves cleaning effect, reduces secondary dust adhesion, saves energy and reduces costs, and extends the life of the driven impeller.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a kind of electromechanical engineering electronic equipment maintenance cleaning mechanism, it is related to electronic equipment maintenance technical field, including rack, clamping platform installed in the bottom of rack, cleaning mechanism elastically installed in the top of rack and dust extraction fan fixed in the top of rack, the cleaning mechanism includes: cleaning round brush, installation sleeve, transmission rod and driven impeller, the inside of cleaning round brush forms cavity and upper end opening, dust extraction hole in the bottom of cleaning round brush is located in bristle gap, the utility model is set through cleaning mechanism and dust extraction fan, dust raised can be sucked and removed simultaneously in cleaning, to avoid dust floating in air when being blown up, reduce the possibility of dust secondary attachment on electronic equipment, dust can also avoid scattering and polluting surrounding environment simultaneously, and rotating cleaning round brush can better clean electronic component surface, and cleaning effect is better.
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Description

Technical Field

[0001] This utility model relates to the field of electronic equipment repair technology, and in particular to a repair and cleaning mechanism for electromechanical engineering electronic equipment. Background Technology

[0002] In electromechanical engineering, a large number of electronic devices are usually deployed. During use, these devices may be damaged and require repair. During the repair process, cleaning mechanisms are needed to clean the surface of the electronic devices to ensure their cleanliness and facilitate the smooth progress of the repair.

[0003] A search revealed a patent document with publication number "CN222035922U" that discloses a cleaning structure for the maintenance of electromechanical engineering electronic equipment. The structure includes a housing with supporting legs fixedly installed at the lower end and base plates fixedly installed on both sides. This cleaning structure uses a fan and duct to disperse dust swept by the cleaning brush, preventing dust accumulation on the worktable and hindering subsequent cleaning of the electronic equipment. The cooperation of a first electric slide rail and a first slider allows the cleaning brush to be precisely adjusted according to the required cleaning position on the electronic equipment, facilitating cleaning. A hydraulic cylinder adjusts the height of the cleaning brush according to the size of the electronic equipment, ensuring the brush just touches it. A drive motor rotates the cleaning brush, cleaning out dust particles embedded in crevices during rotation.

[0004] In addition, a cleaning device for repairing electronic equipment is disclosed in the patent document with the publication number "CN220092366U", which also adopts a cleaning method that combines air blowing and cleaning brushes.

[0005] Based on the above search and combined with existing technology, it was found that most existing electromechanical engineering electronic equipment repair and cleaning organizations have certain drawbacks. For example, although blowing air can achieve a cleaning effect, the dust blown up will pollute the surrounding environment. At the same time, the dust may float around and fall back onto the electronic equipment under the airflow, resulting in incomplete cleaning and unsatisfactory cleaning effect. Therefore, there is a need for an electromechanical engineering electronic equipment repair and cleaning organization. Utility Model Content

[0006] The purpose of this application is to provide a maintenance and cleaning mechanism for electromechanical engineering electronic equipment to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this application provides the following technical solution: a maintenance and cleaning mechanism for electromechanical engineering electronic equipment, comprising a frame, a clamping platform installed at the bottom of the frame, a cleaning mechanism flexibly installed at the top of the frame, and a dust extraction fan fixed to the top of the frame, wherein the cleaning mechanism includes:

[0008] A cleaning round brush, wherein the interior of the cleaning round brush is formed with a cavity and the upper end is open, and the bottom of the cleaning round brush is provided with a dust suction hole located in the gap between the bristles;

[0009] The mounting sleeve has a lower end that is rotatably connected to and sealed to the cleaning brush via a bearing, and the upper end of the mounting sleeve is fixed and connected to a discharge pipe. The discharge pipe is connected to the input end of the vacuum cleaner via a suction pipe, which is a telescopic flexible hose.

[0010] A transmission rod is rotatably installed inside an installation sleeve. The lower end of the transmission rod is fixed to the inner wall of the cleaning circular brush via a lower bracket, and the upper end of the transmission rod is rotatably connected to an upper bracket fixed to the inner wall of the installation sleeve.

[0011] The driven impeller is fixedly sleeved on the upper part of the transmission rod, and rotates with the movement of the airflow in the mounting sleeve.

[0012] Preferably, a fixed partition is fixed inside the mounting sleeve to divide the inner cavity of the mounting sleeve into upper and lower parts, and the lower part of the transmission rod rotates through the fixed partition;

[0013] The mounting sleeve has a flow cavity, and the upper and lower ends of the flow cavity are respectively connected to the upper and lower inner cavities of the mounting sleeve. The mounting sleeve is filled with dust filter consumables.

[0014] The driven impeller is located in the upper inner cavity of the mounting sleeve.

[0015] Preferably, the upper part of the mounting sleeve is integrally formed with a reduced diameter section, the inner diameter of the top of the mounting sleeve is smaller than the inner diameter of the bottom of the mounting sleeve and the inner diameter of the upper end of the cleaning brush, and the driven impeller is located inside the top of the mounting sleeve.

[0016] Preferably, the inner side of the mounting sleeve is provided with an air inlet and an air outlet. The air inlet is connected to the top of the flow cavity and the upper cavity of the mounting sleeve, and the air outlet is connected to the bottom of the flow cavity and the lower cavity of the mounting sleeve.

[0017] Preferably, multiple air inlets and outlets are provided and distributed in a circumferential array along the axis of the mounting sleeve, and the multiple air inlets and multiple air outlets are staggered in the vertical direction.

[0018] Preferably, the flow cavity has an opening on the outer side away from the axis of the mounting sleeve, and a packing side door for closing the outer opening of the flow cavity is hinged at the outer opening of the flow cavity;

[0019] The lower inner side of the mounting sleeve is also provided with a groove for accommodating the bearing.

[0020] Preferably, an elastic connector is installed on the top of the frame. The elastic connector includes a fixed top block, a spring, and a fixed bottom block. The fixed top block is fixed to the top of the frame. The upper and lower ends of the spring are fixed to the fixed top block and the fixed bottom block, respectively. The lower end of the fixed bottom block is fixed to the upper end of the mounting sleeve. The fixed bottom block is a T-shaped frustum that is larger at the top and smaller at the bottom. An annular gap is formed between the lower part of the fixed bottom block and the upper end of the mounting sleeve.

[0021] The top of the frame is also fixed with a hanging bracket, one end of which is integrally formed with a semi-circular hanging ring, which is engaged in the annular gap.

[0022] In summary, the technical effects and advantages of this utility model are as follows:

[0023] 1. In this utility model, by setting up a cleaning mechanism and a dust extraction fan, the dust that is raised can be sucked up while cleaning, thereby preventing the dust from floating in the air when it is blown up, reducing the possibility of dust re-attaching to electronic devices, and preventing dust from scattering and polluting the surrounding environment.

[0024] Meanwhile, the airflow drives the driven impeller to rotate as it passes through the installation sleeve. The rotation of the driven impeller drives the cleaning brush to rotate through the transmission rod and the lower bracket. The rotating cleaning brush can better clean the surface of electronic components, resulting in better cleaning effect. Moreover, no additional power components are required, which can achieve energy saving and cost reduction.

[0025] 2. In this utility model, by setting a fixed partition and a flow chamber, the airflow entering the mounting sleeve is guided into the flow chamber, and only after passing through the flow chamber can it enter the upper cavity of the mounting sleeve and be sucked out after passing through the discharge pipe. When the airflow carrying dust passes through the flow chamber, it is adsorbed by the dust filter material in the flow chamber, thereby trapping and collecting the dust. This prevents the dust from entering the vacuum cleaner with the airflow and being discharged to the outside again through the output end of the vacuum cleaner, ensuring the cleanliness of the external environment. At the same time, it can prevent dust from entering the upper cavity of the mounting sleeve and adhering to the driven impeller, causing the driven impeller to be contaminated, thereby reducing or eliminating the possibility of the driven impeller being damaged by dust erosion and extending the service life of the driven impeller. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure in this embodiment;

[0028] Figure 2 This is a cross-sectional view of the cleaning mechanism in this embodiment;

[0029] Figure 3 This is a partial sectional view of the mounting sleeve in this embodiment;

[0030] Figure 4 This is a front view of the structure when the vacuum cleaner fan is hidden in this embodiment;

[0031] Figure 5 This is a schematic diagram of the hanging bracket structure in this embodiment;

[0032] Figure 6 This is a schematic diagram of the cleaning mechanism and elastic connector in this embodiment.

[0033] In the diagram: 1. Frame; 2. Clamping platform; 3. Cleaning mechanism; 31. Cleaning circular brush; 311. Dust suction hole; 32. Mounting sleeve; 321. Fixed partition; 322. Flow chamber; 3221. Air inlet; 3222. Air outlet; 323. Reduction section; 324. Discharge pipe; 325. Groove; 326. Packing side door; 33. Bearing; 34. Drive rod; 35. Driven impeller; 36. Dust filter consumable; 37. Lower support; 38. Upper support; 4. Dust suction fan; 41. Suction pipe; 5. Hanging bracket; 51. Semi-circular hanging ring; 6. Elastic connector; 61. Fixed top block; 62. Spring; 63. Fixed bottom block; 7. Annular gap. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Example: Reference Figures 1-6The electromechanical engineering electronic equipment maintenance and cleaning mechanism shown includes a frame 1, a clamping platform 2 installed at the bottom of the frame 1, a cleaning mechanism 3 flexibly installed at the top of the frame 1, and a dust extraction fan 4 fixed to the top of the frame 1. The dust extraction fan 4 can be a commonly used dust extraction fan in the prior art that is suitable for this embodiment, such as the RHG510-7H2 Haoguan vortex fan, the TB200-20 Oridi medium-pressure fan, etc. Those skilled in the art can flexibly select according to actual usage needs. The cleaning mechanism 3 includes:

[0036] The cleaning round brush 31 has a cavity inside and an opening at the top. The bottom of the cleaning round brush 31 has a dust suction hole 311 located in the gap between the bristles.

[0037] The mounting sleeve 32 is rotatably connected to the cleaning round brush 31 via the bearing 33 and is sealed and connected. The upper end of the mounting sleeve 32 is fixed and connected to the discharge pipe 324. The discharge pipe 324 is connected to the input end of the vacuum cleaner 4 via the suction pipe 41. The suction pipe 41 is a telescopic flexible hose.

[0038] The transmission rod 34 is rotatably installed inside the mounting sleeve 32. The lower end of the transmission rod 34 is fixed to the inner wall of the cleaning round brush 31 through the lower bracket 37. The upper end of the transmission rod 34 is rotatably connected to the upper bracket 38, which is fixed to the inner wall of the mounting sleeve 32.

[0039] Driven impeller 35 is a vortex impeller. Driven impeller 35 is fixedly sleeved on the upper part of transmission rod 34. Driven impeller 35 rotates with the movement of airflow in mounting sleeve 32.

[0040] Based on the above structure, during cleaning, the electronic device is first placed on the clamping platform 2, then the vacuum cleaner 4 is started, and the cleaning mechanism 3 is pulled down so that the lower end of the cleaning brush 31 is in contact with the surface of the electronic device to be cleaned. The cleaning mechanism 3 is moved to use the cleaning brush 31 to clean the dust attached to the electronic device. During this process, the vacuum cleaner 4 sucks away the dust that is raised through the suction pipe 41, the mounting sleeve 32 and the suction hole 311, thereby preventing the dust from floating when it is blown up (or swept up), reducing the possibility of dust re-attaching to the electronic device, and at the same time preventing the dust from scattering and polluting the surrounding environment.

[0041] Meanwhile, when the airflow passes through the mounting sleeve 32, it will also drive the driven impeller 35 to rotate. When the driven impeller 35 rotates, it will drive the cleaning brush 31 to rotate through the transmission rod 34 and the lower bracket 37. The rotating cleaning brush 31 can better clean the surface of electronic components, resulting in a better cleaning effect. Moreover, there is no need to set up additional power components (such as motors), which can achieve energy saving and cost reduction.

[0042] Furthermore, a fixed partition 321 is fixed inside the mounting sleeve 32 to divide the inner cavity of the mounting sleeve 32 into upper and lower parts, and the lower part of the transmission rod 34 rotates through the fixed partition 321.

[0043] An overflow cavity 322 is provided inside the mounting sleeve 32. The upper and lower ends of the overflow cavity 322 are respectively connected to the upper and lower inner cavities of the mounting sleeve 32. The mounting sleeve 32 is filled with dust filter material 36. The dust filter material 36 is a commonly used filter material in the prior art that is suitable for this embodiment and can filter dust, such as activated carbon filter cotton, synthetic fiber filter cotton, etc.

[0044] Among them, the driven impeller 35 is located in the upper inner cavity of the mounting sleeve 32;

[0045] By setting a fixed baffle 321 and a flow chamber 322, the airflow entering the mounting sleeve 32 is guided into the flow chamber 322, and only after passing through the flow chamber 322 can it enter the upper cavity of the mounting sleeve 32 and be sucked out after passing through the discharge pipe 324. When the airflow carrying dust passes through the flow chamber 322, it is adsorbed by the dust filter material 36 in the flow chamber 322, so that the dust is intercepted and collected. This can prevent the dust from entering the vacuum fan 4 with the airflow and being discharged to the outside again through the output end of the vacuum fan 4, ensuring the cleanliness of the external environment. At the same time, it can prevent dust from entering the upper cavity of the mounting sleeve 32 and adhering to the driven impeller 35, causing the driven impeller 35 to be contaminated, thereby reducing or eliminating the possibility of the driven impeller 35 being damaged by dust erosion and extending the service life of the driven impeller 35.

[0046] Furthermore, the upper part of the mounting sleeve 32 is integrally formed with a reduced diameter section 323, the inner diameter of the top of the mounting sleeve 32 is smaller than the inner diameter of the bottom of the mounting sleeve 32 and the inner diameter of the upper end of the cleaning round brush 31, and the driven impeller 35 is located inside the top of the mounting sleeve 32.

[0047] After passing through the flow cavity 322, the airflow velocity decreases. The reduced diameter section 323 increases the airflow velocity after passing through it, thus enabling the airflow to smoothly drive the driven impeller 35 to rotate, ensuring the effectiveness and reliability of the cleaning operation.

[0048] Furthermore, an air inlet 3221 and an air outlet 3222 are provided on the inner side of the mounting sleeve 32. The air inlet 3221 is connected to the upper cavity of the mounting sleeve 32 through the top of the flow cavity 322, and the air outlet 3222 is connected to the lower cavity of the mounting sleeve 32 through the bottom of the flow cavity 322.

[0049] Multiple air inlets 3221 and multiple air outlets 3222 are provided and are arranged in a circular array along the axis of the mounting sleeve 32. The multiple air inlets 3221 and multiple air outlets 3222 are staggered in the vertical direction.

[0050] By setting multiple air inlets 3221 and multiple air outlets 3222, the airflow entering the flow chamber 322 can fully flow through the dust filter consumable 36 before entering the upper cavity of the mounting sleeve 32, thereby enabling the dust filter consumable 36 to achieve a good filtration effect and ensure the effectiveness of filtration.

[0051] Furthermore, an opening is formed on the outer side of the flow cavity 322 away from the axis of the mounting sleeve 32. A packing side door 326 that closes the outer opening of the flow cavity 322 is hinged at the outer opening of the flow cavity 322. The operator can open the packing side door 326 to take out and fill the filter consumable 36 in the flow cavity 322, which facilitates the replacement of the filter consumable 36 in the flow cavity 322 and facilitates maintenance.

[0052] The lower inner side of the mounting sleeve 32 is also provided with a groove 325 for accommodating the bearing 33.

[0053] Furthermore, an elastic connector 6 is installed on the top of the frame 1. The elastic connector 6 includes a fixed top block 61, a spring 62 and a fixed bottom block 63. The fixed top block 61 is fixed to the top of the frame 1. The upper and lower ends of the spring 62 are fixed to the fixed top block 61 and the fixed bottom block 63 respectively. The lower end of the fixed bottom block 63 is fixed to the upper end of the mounting sleeve 32. The fixed bottom block 63 is a T-shaped frustum that is larger at the top and smaller at the bottom. An annular gap 7 is formed between the lower part of the fixed bottom block 63 and the upper end of the mounting sleeve 32.

[0054] The top of the frame 1 is also fixed with a hanging bracket 5. One end of the hanging bracket 5 is integrally formed with a semi-circular hanging ring 51, which is engaged in the annular gap 7.

[0055] When the cleaning mechanism 3 is not in use, the operator can move the cleaning mechanism 3 to move the fixed base block 63 synchronously, so that the bracket 5 can be inserted into the annular gap 7 from one side, and the cleaning mechanism 3 can be hung on the top of the rack 1. When it is needed, the operator only needs to move the cleaning mechanism 3 to one side to make the bracket 5 disengage from the annular gap 7, and then pull the cleaning mechanism 3 down for use. The elastic connector 6 ensures that the cleaning mechanism 3 will not fall off the top of the rack 1, thus preventing the cleaning mechanism 3 from falling and causing damage to the electronic equipment or itself.

[0056] The working principle of this utility model is as follows: During daily use, when cleaning, the electronic device is first placed on the clamping platform 2, then the vacuum blower 4 is started, and the cleaning mechanism 3 is moved to one side to make the bracket 5 disengage from the annular gap 7. Then, the cleaning mechanism 3 is pulled down so that the lower end of the cleaning brush 31 is in contact with the surface of the electronic device to be cleaned, and the cleaning mechanism 3 is moved to use the cleaning brush 31 to clean the dust attached to the electronic device. During this process, the vacuum blower 4 sucks away the dust that is blown up through the suction pipe 41, the mounting sleeve 32 and the suction hole 311, thereby preventing the dust from floating when it is blown up, reducing the possibility of the dust re-attaching to the electronic device, and at the same time preventing the dust from scattering and polluting the surrounding environment.

[0057] After entering the mounting sleeve 32, the dust-laden airflow enters the flow chamber 322 through the air inlet 3221 and is discharged from the air outlet 3222 into the upper cavity of the mounting sleeve 32. Then, it is sucked out by the suction pipe 41 after passing through the discharge pipe 324. When the dust-laden airflow passes through the flow chamber 322, it is adsorbed by the dust filter material 36 in the flow chamber 322, thereby trapping and collecting the dust.

[0058] Meanwhile, when the airflow passes through the mounting sleeve 32, it will also drive the driven impeller 35 to rotate. When the driven impeller 35 rotates, it will drive the cleaning brush 31 to rotate through the transmission rod 34 and the lower bracket 37. The rotating cleaning brush 31 can better clean the surface of electronic components, resulting in a better cleaning effect. Moreover, no additional power components are required, which can achieve energy saving and cost reduction.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A maintenance and cleaning mechanism for electromechanical engineering electronic equipment, comprising a frame (1), a clamping platform (2) installed at the bottom of the frame (1), a cleaning mechanism (3) flexibly installed at the top of the frame (1), and a dust extraction fan (4) fixed to the top of the frame (1), characterized in that, The cleaning mechanism (3) includes: A cleaning round brush (31) has a cavity inside and an opening at the top. A dust suction hole (311) is provided at the bottom of the cleaning round brush (31) in the gap between the bristles. The mounting sleeve (32) is rotatably connected to the cleaning round brush (31) via a bearing (33) and is sealed and connected. The upper end of the mounting sleeve (32) is fixed and connected to a discharge pipe (324). The discharge pipe (324) is connected to the input end of the vacuum cleaner (4) via a suction pipe (41). The suction pipe (41) is a telescopic flexible hose. The transmission rod (34) is rotatably installed in the mounting sleeve (32). The lower end of the transmission rod (34) is fixed to the inner wall of the cleaning round brush (31) through the lower bracket (37). The upper end of the transmission rod (34) is rotatably connected to the upper bracket (38) which is fixed to the inner wall of the mounting sleeve (32). Driven impeller (35) is fixedly sleeved on the upper part of the transmission rod (34) and rotates with the movement of the airflow in the mounting sleeve (32).

2. The electromechanical engineering electronic equipment repair and cleaning mechanism according to claim 1, characterized in that: The inner side of the mounting sleeve (32) is fixed with a fixed partition (321) that divides the inner cavity of the mounting sleeve (32) into upper and lower parts, and the lower part of the transmission rod (34) rotates through the fixed partition (321); The mounting sleeve (32) has a flow cavity (322) inside, and the upper and lower ends of the flow cavity (322) are respectively connected to the upper and lower inner cavities of the mounting sleeve (32). The mounting sleeve (32) is filled with dust filter consumables (36). The driven impeller (35) is located in the upper inner cavity of the mounting sleeve (32).

3. The electromechanical engineering electronic equipment repair and cleaning mechanism according to claim 2, characterized in that: The upper part of the mounting sleeve (32) is integrally formed with a reduced diameter section (323). The inner diameter of the top of the mounting sleeve (32) is smaller than the inner diameter of the bottom of the mounting sleeve (32) and the inner diameter of the upper end of the cleaning round brush (31). The driven impeller (35) is located inside the top of the mounting sleeve (32).

4. The electromechanical engineering electronic equipment repair and cleaning mechanism according to claim 2, characterized in that: The mounting sleeve (32) has an air inlet (3221) and an air outlet (3222) on its inner side. The air inlet (3221) is connected to the top of the flow cavity (322) and the upper cavity of the mounting sleeve (32). The air outlet (3222) is connected to the bottom of the flow cavity (322) and the lower cavity of the mounting sleeve (32).

5. The electromechanical engineering electronic equipment repair and cleaning mechanism according to claim 4, characterized in that: The air inlet (3221) and air outlet (3222) are provided with multiple air inlets (3221) and are arranged in a circular array along the axis of the mounting sleeve (32). The multiple air inlets (3221) and multiple air outlets (3222) are staggered in the vertical direction.

6. The electromechanical engineering electronic equipment repair and cleaning mechanism according to claim 2, characterized in that: An opening is formed on the outer side of the flow cavity (322) away from the axis of the mounting sleeve (32), and a packing side door (326) for closing the outer opening of the flow cavity (322) is hinged at the outer opening of the flow cavity (322). The lower inner side of the mounting sleeve (32) is also provided with a groove (325) for accommodating the bearing (33).

7. A maintenance and cleaning mechanism for electromechanical engineering electronic equipment according to any one of claims 1-6, characterized in that: The top of the frame (1) is equipped with an elastic connector (6). The elastic connector (6) includes a fixed top block (61), a spring (62) and a fixed bottom block (63). The fixed top block (61) is fixed to the top of the frame (1). The upper and lower ends of the spring (62) are fixed to the fixed top block (61) and the fixed bottom block (63) respectively. The lower end of the fixed bottom block (63) is fixed to the upper end of the mounting sleeve (32). The fixed bottom block (63) is a T-shaped frustum with a larger upper part and a smaller lower part. An annular gap (7) is formed between the lower part of the fixed bottom block (63) and the upper end of the mounting sleeve (32). The top of the frame (1) is also fixed with a hanging bracket (5), one end of which is integrally formed with a semi-circular hanging ring (51), which is engaged in the annular gap (7).