Dust recovery treatment equipment for transformer weld joint polishing equipment

Abstract

The invention relates to the technical field of dust treatment of welding seam polishing equipment, and discloses dust recovery treatment equipment for transformer welding seam polishing equipment, which comprises a transparent closed frame provided with a magnetic suction sealing door, the top of the frame is communicated with a dust collection cover, and a plurality of groups of electrostatic dust collection plates capable of synchronously rotating are arranged in the frame; and self-cleaning is realized through a linear guide rail brush mechanism. And a compression box passing through a hydraulic compaction mechanism is arranged at the bottom of the dust collection cover. During working, suspended dust falls into the compression box to be pressed into blocks after being subjected to secondary purification of electrostatic adsorption and centrifugal separation. Through the integrated design of closed collection, multi-stage purification and compaction forming, the problems of metal dust dissipation, filter element blockage and secondary pollution are effectively solved, and efficient recovery and resource utilization of dust are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dust treatment of welding seam polishing equipment, in particular to a dust recycling treatment equipment for transformer welding seam polishing equipment. BACKGROUND

[0002] The transformer is the main equipment of the power system, and the quality of the box body welding seam of the transformer is directly related to the safety and service life of the equipment. In the production process, the welding seam of the transformer box body is polished.

[0003] However, this process produces a large amount of metal dust, which not only has an abrasive effect, but also may contain heavy metal components, posing a serious threat to the working environment, the health of the operators and the production equipment.

[0004] At present, the treatment method of welding and polishing dust in the industry mainly depends on traditional centralized dust removal system or single machine dust removal equipment. These devices usually use one or two stage filtration methods, for example, directly using filter cartridges or filter bags for filtration, or assisted by simple cyclone separation.

[0005] However, the collection efficiency of dust is limited. Due to the variable position of the polishing point, ordinary side suction or down suction cover cannot effectively capture all the suspended fine dust, resulting in part of the dust escaping into the workshop air and polluting the environment. The coarse particle dust falling on the workbench often needs to be cleaned by manual after stopping, which is time-consuming and laborious and easy to cause secondary dust.

[0006] Secondly, the core filter of the dust removal equipment is easily clogged and has a short service life. The metal dust produced by the polishing of the welding seam of the transformer has high density and hard texture, especially the fibrous or sheet metal chips, which can easily penetrate the pre-filter and adhere to the surface of the fine filter cartridge, rapidly increasing the system resistance and causing the air volume to decay. Frequent pulse cleaning has little effect on this type of metal dust, so the filter core must be replaced frequently, which not only increases the maintenance cost, but also affects the continuity of production.

[0007] Therefore, we propose a dust recycling treatment equipment for transformer welding seam polishing equipment to solve the problems in the above background. SUMMARY

[0008] The dust recycling treatment equipment for transformer welding seam polishing equipment can solve the problem that the core filter of the dust removal equipment is easily clogged in the prior art, so that the filter core must be replaced frequently, which not only increases the maintenance cost, but also affects the continuity of production.

[0009] In order to solve the above technical problems, the present application provides the following technical scheme: A dust recovery and treatment device for transformer weld grinding equipment includes a weld grinding table. The upper part of the weld grinding table is provided with a transparent frame. The two ends of the transparent frame are respectively provided with an inlet and an outlet. Magnetic doors are rotatably provided at the inlet and outlet. A dust collection hood is connected to the upper end of the transparent frame. A centrifuge is connected to the end of the dust collection hood away from the transparent frame. A compression box for compressing dust is connected to the outlet end of the centrifuge. An electrostatic dust collection component is installed at the end of the dust collection hood near the transparent frame.

[0010] Preferably, the electrostatic dust collection assembly includes several linearly distributed electrostatic dust collection plates, which are rotatably disposed inside the dust collection hood. A collection box is detachably installed at one end of the dust collection hood parallel to the direction of the electrostatic dust collection plates, and an automatic cleaning component is provided inside the dust collection hood.

[0011] Preferably, a shaft is fixedly connected inside the electrostatic dust collection plate, and both ends of the shaft are rotatably connected to the ends of the dust collection hood. A linkage gear is fixedly installed at one end of the shaft, and multiple sets of linkage gears mesh with each other. A rotary drive component for driving the linkage gear to rotate is installed outside the dust collection hood.

[0012] Preferably, the automatic cleaning component includes linear drive rails disposed on both sides inside the dust collection hood, and a brush is installed between the two sets of linear drive rails. The two sets of linear drive rails drive the brush to slide along the direction of the electrostatic dust collection plate.

[0013] Preferably, a movable blowing assembly is installed on the inner top side of the transparent frame near the dust collection hood, and electric telescopic rods are fixedly installed on both sides of the top of the transparent frame. The electric telescopic rods drive the movable blowing assembly to adjust its height inside the dust collection hood.

[0014] Preferably, the mobile purging assembly includes an annular guide rail, on which a drive slider is slidably mounted. A drive gear is mounted on one side of the drive slider, and a servo motor that drives the drive gear to rotate is installed inside the drive slider. The outer circumference of the annular guide rail is provided with toothed grooves, and the drive gear meshes with the toothed grooves on the outer side of the annular guide rail.

[0015] Preferably, an electrically controlled rotating seat is installed on the side of the drive slider away from the annular guide rail, and a vortex fan is installed on the electrically controlled rotating seat. The electrically controlled rotating seat is used for adjusting the angle of the vortex fan.

[0016] Preferably, the centrifuge is fixedly installed with support columns around its bottom, the compression box is installed inside the support columns, a pressure plate is slidably installed on one side inside the compression box, a hydraulic press is fixedly installed on the side wall of the compression box, the hydraulic press pushes the pressure plate to compress the dust collected inside the compression box, the bottom of the compression box has a discharge port, and a telescopic bottom plate is slidably installed at the discharge port of the compression box.

[0017] Preferably, the rotary drive component includes a stepper motor, which is fixedly mounted on the dust collection cover. A drive gear is fixedly mounted on the shaft of the stepper motor, and the drive gear meshes with a linkage gear on one side.

[0018] Preferably, the magnetic door is made of a transparent door panel, with magnetic plates fixedly installed on both sides of the magnetic door, and magnetic blocks that attract the magnetic plates are installed on both sides of the transparent frame near the magnetic door.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention utilizes a transparent frame and magnetic door to ensure a sealed space, preventing dust diffusion. The magnetic door opens when workpieces are moved in and out, guaranteeing a tight seal during operation. An electrostatic dust collection component efficiently adsorbs fine dust, reducing air pollution in the workshop. A centrifuge separates coarser dust particles using centrifugal force, improving collection efficiency. A compression box compresses the collected dust into solid blocks for easy handling and recycling. A mobile blowing component periodically cleans the transparent frame and workpiece surface to prevent dust accumulation. An automatic cleaning component keeps the electrostatic dust collection component clean, ensuring its continuous and effective operation. A rotating drive synchronously adjusts the angle of the electrostatic dust collection plates, optimizing the adsorption effect. During grinding operations, the dust generated is captured within the sealed space, and the magnetic door ensures a tight seal.

[0020] Dust is efficiently adsorbed by an electrostatic precipitator, then separated a second time by a centrifuge. The collected dust is then compressed into shape in a compression chamber. Simultaneously, a mobile purging unit regularly cleans the inside and outside of the equipment, maintaining its cleanliness and overall operational efficiency. Through this design, the equipment significantly improves dust collection efficiency, reduces maintenance costs, ensures a clean workshop environment and protects the health of operators, and achieves effective resource recovery of metal dust. The integrated design of sealed collection, multi-stage purification, and compaction effectively solves the problems of metal dust escape, filter clogging, and secondary pollution, achieving efficient dust recovery and resource utilization. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the electrostatic dust collection plate installation structure of the present invention; Figure 4 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 5 For the present invention Figure 4 A magnified structural diagram at point A; Figure 6 This is a schematic diagram of the vortex fan mounting structure of the present invention.

[0022] The components include: 1. Weld grinding table; 2. Magnetic door; 3. Dust collection hood; 4. Dust suction pipe; 5. Centrifuge; 6. Support column; 7. Compression box; 8. Hydraulic press; 9. Pressure plate; 10. Telescopic base plate; 11. Electrostatic dust collection plate; 12. Shaft; 13. Linkage gear; 14. Rotary drive component; 15. Brush; 16. Linear drive guide rail; 21. Circular guide rail; 22. Electric telescopic rod; 23. Drive slider; 24. Drive gear; 25. Electrically controlled rotating seat; 26. Vortex fan. Detailed Implementation

[0023] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0024] Example 1: Please see Figures 1-6 The present invention provides a technical solution: Example 1: Please see Figures 1-6 The present invention provides a technical solution: A dust recovery and treatment device for transformer weld grinding equipment includes a weld grinding table 1, characterized in that: the weld grinding table 1 has a transparent frame on its upper part, with an inlet and an outlet at both ends of the transparent frame, and magnetic suction doors 2 are rotatably installed at the inlet and outlet; a dust collection hood 3 is connected to the upper end of the transparent frame; a centrifuge 5 is connected to the end of the dust collection hood 3 away from the transparent frame; a suction pipe 4 is connected between the inlet of the centrifuge 5 and the dust collection hood 3; a compression box 7 for compressing dust is connected to the outlet end of the centrifuge 5; and an electrostatic dust collection component is installed at the end of the dust collection hood 3 near the transparent frame.

[0025] Using the above technical solution, the transformer workpiece is ground on the weld grinding table 1. The generated dust is enclosed by the sealed space formed by the upper transparent frame, preventing it from spreading throughout the workshop. The magnetic door 2 opens when the workpiece enters or exits and closes during operation to ensure airtightness.

[0026] The dust generated during grinding is partially discharged back onto the grinding table by gravity, while the finer dust particles are suspended due to the heat and airflow from the grinding process. The dust-laden airflow, after entering the duct of dust collection hood 3, first passes through an electrostatic dust collection component. This component uses a high-voltage electrostatic field to charge the passing metal dust particles, causing them to adhere to the collection plate. This step efficiently removes most of the light and fine suspended dust.

[0027] The airflow, after electrostatic adsorption, then enters centrifuge 5. Inside centrifuge 5, the airflow rotates at high speed, and the remaining larger dust particles that were not completely captured by electrostatics are thrown against the machine wall and fall off under the action of centrifugal force, achieving secondary separation.

[0028] The metal dust collected by centrifuge 5 is then transported to compression chamber 7. Inside compression chamber 7, the dust is compressed into solid blocks by hydraulic or other mechanical means.

[0029] By setting up a transparent frame and magnetic door 2, a relatively enclosed operating space is formed, which effectively prevents dust from spreading into the workshop air over a large area, thus protecting the working environment and the health of operators.

[0030] By using the electrostatic dust collection component in series with the centrifuge 5, electrostatic adsorption is used to efficiently adsorb fine dust, and centrifugal separation is used to effectively attract larger particles, thus performing two-stage purification of dust, improving the overall collection efficiency and reducing the load on a single device.

[0031] The final compression chamber 7 compresses the loose and easily dispersed dust into dense blocks, greatly reducing the dust volume and preventing it from flying away during subsequent handling and disposal, thus avoiding secondary pollution. It also facilitates recycling as solid waste.

[0032] The electrostatic dust collection assembly includes several linearly distributed electrostatic dust collection plates 11, which are rotatably disposed inside the dust collection hood 3. A collection box is detachably installed at one end of the dust collection hood 3 parallel to the direction of the electrostatic dust collection plates 11, and an automatic cleaning component is provided inside the dust collection hood 3.

[0033] Through the above technical solution, the electrostatic dust collection assembly adsorbs dust through a number of linearly distributed electrostatic dust collection plates 11. The electrostatic dust collection plates 11 are rotatably disposed inside the dust collection hood 3, and the angle can be adjusted to enhance the adsorption effect; a collection box is detachably installed at one end of the dust collection hood 3 for centralized temporary storage of adsorbed dust; the electrostatic dust collection assembly can be used independently or in conjunction with a centrifuge 5.

[0034] The automatic cleaning component inside the dust collection hood 3 can periodically remove dust adhering to the surface of the electrostatic dust collection plate 11, preventing dust accumulation from affecting the adsorption efficiency.

[0035] An internal shaft 12 is fixedly connected to the electrostatic dust collection plate 11. Both ends of the shaft 12 are rotatably connected to the ends of the dust collection hood 3. A linkage gear 13 is fixedly installed at one end of the shaft 12. Multiple sets of linkage gears 13 mesh with each other. A rotary drive component 14 for driving the linkage gear 13 to rotate is installed on the outside of the dust collection hood 3.

[0036] Through the above technical solution, the shaft 12 fixedly connected inside the electrostatic dust collection plate 11 is rotatably connected to the end of the dust collection hood 3. The linkage gear 13 at one end of the shaft 12 meshes with each other, thereby realizing the synchronous rotation of multiple sets of electrostatic dust collection plates 11. The rotating drive component 14 installed outside the dust collection hood 3 drives the linkage gear 13 to rotate, so that the angle of the electrostatic dust collection plate 11 is periodically adjusted during the adsorption process, thereby improving the uniformity and coverage of dust adsorption. By adjusting the angle of the electrostatic dust collection plate 11, it is beneficial for the centrifuge 5 to suck large particles of dust into the centrifuge 5 when it is working.

[0037] The automatic cleaning component includes linear drive rails 16 disposed on both sides inside the dust collection hood 3, and a brush 15 is installed between the two sets of linear drive rails 16. The two sets of linear drive rails 16 drive the brush 15 to slide along the direction of the electrostatic dust collection plate 11.

[0038] Through the above technical solution, the automatic cleaning component drives the brush 15 to slide along the direction of the electrostatic dust collection plate 11 via the linear drive rails 16 on both sides inside the dust collection cover 3; during the sliding process, the brush 15 scrapes and cleans the surface of the electrostatic dust collection plate 11, removes the attached dust, and the cleaned dust falls into the collection box, thereby realizing the self-cleaning and maintenance of the electrostatic dust collection plate 11.

[0039] A movable blowing assembly is installed on the inner top of the transparent frame near the dust collection hood 3. Electric telescopic rods 22 are fixedly installed on both sides of the top of the transparent frame. The electric telescopic rods 22 drive the movable blowing assembly to adjust its height inside the dust collection hood 3.

[0040] Through the above technical solution, a mobile blowing assembly is installed on the top inner side of the transparent frame near the dust collection hood 3. The mobile blowing assembly is raised and lowered by the electric telescopic rods 22 on both sides of the top of the transparent frame. During the raising and lowering process, the mobile blowing assembly blows away the dust attached to the inner wall of the transparent frame, as well as the transformer weld and its surface, to prevent dust accumulation from affecting the view and to ensure the cleanliness of the welded transformer surface.

[0041] Example 2: Please see Figures 1-6 Furthermore, in conjunction with Example 1, it is obtained that, The mobile purging assembly includes an annular guide rail 21, on which a drive slider 23 is slidably mounted. A drive gear 24 is mounted on one side of the drive slider 23. A servo motor that drives the drive gear 24 to rotate is installed inside the drive slider 23. The outer circumference of the annular guide rail 21 is provided with toothed grooves, and the drive gear 24 meshes with the toothed grooves on the outer side of the annular guide rail 21.

[0042] Through the above technical solution, the mobile purging assembly realizes the circumferential movement of the drive slider 23 through the annular guide rail 21. The drive gear 24 installed on one side of the drive slider 23 is driven to rotate by the servo motor. The drive gear 24 meshes with the tooth groove set on the outer side of the annular guide rail 21, thereby driving the drive slider 23 to slide along the annular guide rail 21, realizing the comprehensive coverage purging of the inner wall of the transparent frame, as well as the overall purging of the outer periphery of the transformer.

[0043] An electrically controlled rotating seat 25 is installed on the side of the drive slider 23 away from the annular guide rail 21. A vortex fan 26 is installed on the electrically controlled rotating seat 25, which is used for adjusting the angle of the vortex fan 26.

[0044] Through the above technical solution, an electrically controlled rotating seat 25 is installed on the side of the drive slider 23 away from the annular guide rail 21. The vortex fan 26 installed on the electrically controlled rotating seat 25 can be adjusted at multiple angles through the electrically controlled rotating seat 25, so that the airflow direction of the vortex fan 26 can be accurately aimed at the inner wall of the frame or the weld surface, improving the targeting and cleaning effect of the blowing. The electrically controlled rotating seat 25 is a conventional steering structure, similar to the existing fan oscillation structure.

[0045] Centrifuge 5 has support columns 6 fixedly installed around its bottom. Compression box 7 is installed inside the support columns 6. A pressure plate 9 is slidably installed on one side inside the compression box 7. A hydraulic press 8 is fixedly installed on the side wall of the compression box 7. The hydraulic press 8 pushes the pressure plate 9 to compress the dust collected inside the compression box 7. The bottom of the compression box 7 has a discharge port. A telescopic bottom plate 10 is slidably installed at the discharge port of the compression box 7.

[0046] Through the above technical solution, the centrifuge 5 is fixedly installed at the bottom by the support column 6. The pressure plate 9, which is slidably set on one side inside the pressure box 7, is pushed by the hydraulic press 8 installed on the side wall to compress the collected dust into shape. The discharge port at the bottom of the pressure box 7 is controlled to open and close by the telescopic bottom plate 10, which is slidably set, so as to facilitate the unloading of the compressed material.

[0047] The rotary drive component 14 includes a stepper motor, which is fixedly mounted on the dust collection cover 3. A drive gear is fixedly mounted on the shaft of the stepper motor, and the drive gear meshes with the linkage gear 13 on one side.

[0048] Through the above technical solution, the rotary drive component 14 is driven by a stepper motor, which is fixed on the dust collection cover 3. The drive gear mounted on its rotating shaft meshes with the linkage gear 13, driving all the meshing linkage gears 13 to rotate synchronously, thereby realizing the unified angle adjustment of multiple sets of electrostatic dust collection plates 11.

[0049] The magnetic door 2 uses a transparent door panel. Magnetic plates are fixedly installed on both sides of the magnetic door 2, and magnetic blocks that attract the magnetic plates are installed on both sides of the transparent frame near the magnetic door 2.

[0050] Through the above technical solution, the magnetic door 2 adopts a transparent door panel for easy observation. The magnetic plates fixed on both sides of the door panel and the magnetic blocks on both sides of the transparent frame attract each other to form a reliable sealing structure, effectively preventing dust from escaping from the door gap, thus facilitating the entry and exit of the transformer to be polished into the transparent frame.

[0051] Working principle of the dust recovery and treatment equipment used in transformer weld grinding: When the transformer workpiece is ground on the weld grinding table 1, the generated dust is enveloped in the sealed space formed by the transparent frame, and the magnetic door 2 ensures the airtightness when closed. Under the airflow guidance of the dust collection hood 3, the suspended dust first passes through the electrostatic dust collection component to adsorb fine particles, and the remaining dust enters the centrifuge 5 to achieve secondary separation through centrifugal force. The collected dust is finally transported to the compression box 7, where the hydraulic press 8 pushes the pressure plate 9 to compact it into blocks, and the discharge is controlled by the telescopic base plate 10. At the same time, the moving blowing component, driven by the annular guide rail 21 and the electrically controlled rotating seat 25, blows the inner wall of the transparent frame and the surface of the workpiece from multiple angles. The electrostatic dust collection plate 11 achieves synchronous rotation adjustment through the linkage gear 13 set, and the linear drive guide rail 16 drives the brush 15 to complete self-cleaning.

[0052] This equipment achieves sealed control of dust sources through a transparent frame and magnetic door 2. The dual-stage purification mechanism of electrostatic dust collection and centrifugal separation significantly improves dust collection efficiency. The compaction treatment of the compression box 7 effectively prevents secondary pollution. The synergistic effect of the mobile blowing component and the self-cleaning system ensures the continuous and stable operation of the equipment. Thus, while improving the working environment and reducing the frequency of equipment maintenance, it realizes the resource recovery of metal dust.

[0053] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A dust recovery treatment apparatus for a transformer weld polishing apparatus, comprising a weld polishing table (1), characterized by: The welding seam polishing table (1) is provided with a transparent frame at the upper portion, the both ends of the transparent frame are respectively provided with an entrance and an exit, the entrance and the exit are rotatably provided with a magnetic attraction door (2), the upper end of the transparent frame is communicated with a dust collecting hood (3), the end of the dust collecting hood (3) away from the transparent frame is communicated with a centrifugal machine (5), the dust collecting hood (3) and the centrifugal machine (5) are communicated with a dust suction pipe (4), the outlet end of the centrifugal machine (5) is communicated with a compression box (7) for compressing dust, and the end of the dust collecting hood (3) close to the transparent frame is provided with an electrostatic dust collecting assembly.

2. The dust recovery treatment apparatus for a transformer weld joint grinding apparatus according to claim 1, characterized by: The electrostatic dust collecting assembly comprises a plurality of linearly distributed electrostatic dust collecting plates (11), the electrostatic dust collecting plates (11) are rotatably arranged in the dust collecting hood (3), and the end of the dust collecting hood (3) parallel to the direction of the electrostatic dust collecting plates (11) is detachably provided with a collecting box.

3. A dust recovery treatment apparatus for a transformer weld grinding apparatus according to claim 2, characterized by: The electrostatic dust collecting plate (11) is fixedly connected with a shaft rod (12) inside, the both ends of the shaft rod (12) are rotatably connected with the end of the dust collecting hood (3), one end of the shaft rod (12) is fixedly provided with a linkage gear (13), a plurality of linkage gears (13) are meshed with each other, and the outside of the dust collecting hood (3) is provided with a rotary driving part (14) for driving the linkage gear (13) to rotate.

4. The dust recovery treatment apparatus for a transformer weld grinding apparatus according to claim 3, characterized by: The automatic cleaning assembly comprises linear drive rails (16) arranged on both sides of the dust collecting hood (3), and a brush (15) is arranged between the two linear drive rails (16).

5. A dust recovery treatment apparatus for a transformer weld grinding apparatus according to claim 4, characterized by: The top of the transparent frame close to the dust collecting hood (3) is internally provided with a movable blowing assembly, electric telescopic rods (22) are fixedly arranged on both sides of the top of the transparent frame, and the electric telescopic rods (22) drive the movable blowing assembly to ascend and descend in the dust collecting hood (3).

6. A dust recovery treatment apparatus for a transformer weld grinding apparatus according to claim 5, characterized by: The movable blowing assembly comprises an annular guide rail (21), a driving sliding block (23) is slidably arranged on the annular guide rail (21), a driving gear (24) is arranged on one side of the driving sliding block (23), a servo motor is arranged in the driving sliding block (23) and drives the driving gear (24) to rotate, a plurality of tooth grooves are arranged on the outer side of the annular guide rail (21), and the driving gear (24) is meshed with the tooth grooves on the outer side of the annular guide rail (21).

7. A dust recovery treatment apparatus for a transformer weld grinding apparatus according to claim 6, characterized by: An electric control rotating base (25) is arranged on the side of the driving sliding block (23) away from the annular guide rail (21), a vortex fan (26) is arranged on the electric control rotating base (25), and the electric control rotating base (25) is used for angle adjustment of the vortex fan (26).

8. The dust recovery treatment apparatus for a transformer weld grinding apparatus according to claim 1, characterized by: Support columns (6) are fixedly arranged on the bottom of the centrifugal machine (5), the compression box (7) is arranged on the inner side of the support column (6), a pressing plate (9) is slidably arranged on one side of the compression box (7), a hydraulic machine (8) is fixedly arranged on the side wall of the compression box (7), the hydraulic machine (8) drives the pressing plate (9) to press the dust collected in the compression box (7), a discharge port is arranged on the bottom of the compression box (7), and a telescopic bottom plate (10) is slidably arranged on the discharge port of the compression box (7).

9. A dust recovery treatment apparatus for a transformer weld grinding apparatus according to claim 3, characterized by: The rotating driving part (14) comprises a stepping motor fixedly installed on the dust collecting cover (3), a driving gear fixedly installed on a rotating shaft of the stepping motor, and a linkage gear (13) on one side engaged with the driving gear.

10. The dust recovery treatment apparatus for a transformer weld grinding apparatus according to claim 1, characterized by: The magnetic attraction door (2) adopts a transparent door plate, and magnetic attraction plates are fixedly arranged on two sides of the magnetic attraction door (2). The transparent frame is provided with magnetic attraction blocks that are attracted to the magnetic attraction plates on the two sides of the magnetic attraction door (2).

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