Electric control cabinet for coal mine electromechanics
By designing a sliding and rotating mounting bracket and ventilation components for the electrical control cabinet used in coal mines, the problem of downtime losses during the maintenance of coal mine electrical control cabinets has been solved, maintenance efficiency and heat dissipation have been improved, and equipment costs have been reduced.
Patent Information
- Application Number
- CN202520336402.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-02-28
AI Technical Summary
Repairing and maintaining electrical control cabinets in coal mines requires suspending mining operations, resulting in significant losses in personnel and equipment costs.
An electrical control cabinet for coal mine electromechanical applications was designed. Through the cooperation of movable components, limit components, and fixed components, the mounting bracket is allowed to slide and rotate within the housing, facilitating maintenance and repair. The ventilation components also improve heat dissipation.
It improves maintenance efficiency, shortens the construction period, reduces losses caused by mining shutdowns, and prevents dust from entering and improves heat dissipation through the design of filters and cooling fans.
Smart Images
Figure CN223912146U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to control cabinet technical field, concretely is electrical control cabinet for coal mine electromechanical. BACKGROUND
[0002] Control cabinet is according to the electrical wiring requirement with switch device, measuring instrument, protection electric appliance and auxiliary equipment are assembled in the closed or semi-closed metal cabinet or the equipment on the screen, and its arrangement should satisfy the requirement of the normal operation of electric power system, is convenient for overhauling, does not endanger the safety of the person and surrounding equipment, and electrical control cabinet needs professional personnel to maintain and overhaul regularly, or when the failure appears, also needs professional personnel to repair.
[0003] In the coal mine, part mechanical equipment and electric power system are also controlled through control cabinet, but the difference is that, due to the high cost of personnel and equipment in the process of coal mining, the mining needs to be suspended when the electrical control cabinet inside the mine is repaired and maintained, which causes certain loss. UTILITY MODEL CONTENTS
[0004] In view of the deficiency of prior art, the utility model provides an electrical control cabinet for coal mine electromechanical, which solves the problem that part mechanical equipment and electric power system are also controlled through control cabinet in the coal mine, but the difference is that, due to the high cost of personnel and equipment in the process of coal mining, the mining needs to be suspended when the electrical control cabinet inside the mine is repaired and maintained, which causes certain loss.
[0005] To achieve the above purpose, the utility model realizes the following technical scheme: an electrical control cabinet for coal mine electromechanical, comprising a shell, a mounting frame is arranged inside the shell, the electrical control cabinet for coal mine electromechanical further comprises a movable assembly, the movable assembly is arranged above the side surface of the mounting frame; a limiting assembly is arranged below the side surface of the mounting frame; a fixing assembly is arranged between the limiting assembly and the mounting frame; wherein the movable assembly cooperates with the limiting assembly to support and adjust the mounting frame, and the mounting frame is fixed inside the shell through the fixing assembly.
[0006] Preferably, the movable assembly comprises a first limiting frame, the first limiting frame is fixedly connected to the upper inner wall of the shell; a first rotating shaft is movably connected to the inner wall of the first limiting frame and fixedly connected to the upper side surface of the mounting frame; a tension spring is connected to the outer wall of the first rotating shaft and the inner wall of the shell at both ends; a limiting groove is formed in the first limiting frame and forms a U-shaped sliding groove with the first limiting frame; wherein the first limiting frame and the first rotating shaft cooperate to realize the sliding of the mounting frame inside the shell, and the tension spring gives the first rotating shaft a pulling force inside the limiting groove when the first rotating shaft moves to the limiting groove.
[0007] Preferably, the limiting assembly comprises a second limiting frame fixed below the inner wall of the shell; a second rotating shaft movably connected to the inner wall of the second limiting frame and fixed below the side of the mounting rack; wherein the second limiting frame cooperates with the second rotating shaft to limit the lower part of the mounting rack, and the second rotating shaft and the second limiting frame are separated through the front opening of the second limiting frame.
[0008] Preferably, the fixing assembly comprises a blocking piece arranged on the front of the second rotating shaft; a rubber pad fixed to one side of the blocking piece close to the second rotating shaft and matched with the surface of the second rotating shaft; a support arranged below the blocking piece and fixed to the inner wall of the shell; a compression spring abutting between the support and the blocking piece; a plug rod sequentially inserted into the compression spring and the inner wall of the support from top to bottom, and the top of the plug rod is fixed to the bottom of the blocking piece; wherein the compression spring gives the blocking piece an upward force, and the rubber pad on the surface of the blocking piece is attached to the outer wall of the second rotating shaft under the limitation of the plug rod, and the lower half of the mounting rack is fixed by cooperating with the second limiting frame.
[0009] Preferably, the lower part of the mounting rack is provided with a support rod hinged to the bottom of the inner wall of the shell.
[0010] Preferably, the shell is provided with a ventilation assembly, the ventilation assembly comprising a filter screen arranged at the bottom of the inner wall of the shell; a frame embedded in the bottom of the inner wall of the shell and fixed to the outer wall of the filter screen; a protrusion arranged on the outer wall of the frame; an opening arranged on the bottom of the inner wall of the shell and matched with the protrusion; a cooling fan installed above the side of the shell and penetrating through the side wall of the shell; and a protective cover fixed to the side of the shell and located above the cooling fan, wherein the cooling fan forms an air duct from bottom to top through the filter screen, which is beneficial to the overall heat dissipation of the inside of the shell, the protrusion and the opening are beneficial to the assembly of the frame and the shell, and the protective cover protects the cooling fan. Advantages
[0011] The utility model provides a kind of electrical control cabinet for coal mine electromechanical, with the following advantages: the electrical control cabinet for coal mine electromechanical, during maintenance, can rotate the mounting rack installed with electronic components and device to a certain angle, and extend to the outside of shell, which is beneficial to the illumination and operation of staff, greatly improves efficiency, shortens maintenance and repair period, is beneficial to the progress of coal mining, and reduces the loss caused by temporary stop mining.
[0012] Through the cooperation between filter screen, cooling fan and protrusion, on the one hand, dust in coal mine can be prevented from entering the inside of shell while dissipating heat, and filter screen can be replaced conveniently, on the other hand, the setting of filter screen and cooling fan position makes cooling fan draw external air from filter screen into the inside of shell, and airflow flows from bottom to top, sequentially dissipates heat for electronic components in the inside of shell, improves heat dissipation effect and air flow effect. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 is a structural schematic view of the utility model;
[0014] Figure 2 is Figure 1 is a structural schematic view of the mounting frame, the first limiting frame and the tension spring;
[0015] Figure 3 is Figure 1 is a structural schematic view of the mounting frame, the second limiting frame and the support;
[0016] Figure 4 is Figure 1 is a structural schematic view of the shell, the support rod and the filter screen.
[0017] In the figure: 1, shell; 2, mounting frame; 3, movable assembly; 31, first limiting frame; 32, first rotating shaft; 33, tension spring; 34, limiting groove; 4, limiting assembly; 41, second limiting frame; 42, second rotating shaft; 5, fixed assembly; 51, blocking piece; 52, rubber pad; 53, support; 54, compression spring; 55, insertion rod; 6, support rod; 7, ventilation assembly; 71, filter screen; 72, frame; 73, protrusion; 74, opening; 75, cooling fan; 76, protective cover. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0019] Through the personnel in the art, all electrical components in the case and the power supply matched therewith are connected through wires, and appropriate controllers and encoders should be selected according to actual conditions to meet the control requirements. The specific connection and control sequence should be completed according to the working principle described below, the working order between electrical components, and the detailed connection means are known in the art. The working principle and process are mainly introduced below, and the electrical control is not described.
[0020] Through the personnel in the art, the parts in the case are connected in sequence. The specific connection and operation sequence should be referred to the working principle described below, and the detailed connection means are known in the art. The working principle and process are mainly introduced below.
[0021] In the coal mine, part of mechanical equipment and power system are also controlled through the control cabinet, but the difference is that, due to the high cost of personnel and equipment in the process of coal mining, the mining needs to be suspended when the electrical control cabinet inside the mine is repaired and maintained, which causes a certain loss.
[0022] Therefore, the electrical control cabinet for coal mine electromechanical is provided, which can rotate the mounting rack 2 installed with electronic elements and devices to a certain angle and extend to the outside of the shell 1 during maintenance, facilitate the lighting and operation of the workers, greatly improve the efficiency, shorten the maintenance and repair period, facilitate the coal mining, and reduce the loss caused by the suspension of mining.
[0023] By Figures 1-4 It can be seen that the electrical control cabinet for coal mine electromechanical includes a shell 1, the inside of the shell 1 is provided with a mounting rack 2, the electrical control cabinet for coal mine electromechanical also includes a movable assembly 3, a limiting assembly 4 and a fixing assembly 5, the movable assembly 3 is arranged above the side of the mounting rack 2, the limiting assembly 4 is arranged below the side of the mounting rack 2, and the fixing assembly 5 is arranged between the limiting assembly 4 and the mounting rack 2, wherein the movable assembly 3 cooperates with the limiting assembly 4 to support and adjust the mounting rack 2, and the mounting rack 2 is fixed in the inside of the shell 1 through the fixing assembly 5.
[0024] In the specific implementation process, it is particularly worth pointing out that the inside of the shell 1 is provided with necessary electronic elements through the mounting rack 2, the mounting rack 2 is made of metal material and is provided with a reserved mounting hole for fixing the electronic elements, and the surface is coated with an insulating anticorrosive paint, the movable assembly 3 limits the upper half of the mounting rack 2, the limiting assembly 4 limits the lower half of the mounting rack 2, so that the mounting rack 2 can slide outwardly in the inside of the shell 1, and the limiting assembly 4 is disabled between the mounting rack 2 and the shell 1, at this time, the mounting rack 2 can be rotated to be inclined, which is beneficial to the installation and removal of the electronic elements on the surface of the mounting rack 2, and the mounting rack 2 is restored to the original position, and then the mounting rack 2 is fixed in the inside of the shell 1 through the fixing assembly 5, so as to ensure the fixing effect.
[0025] It can be understood that, due to the high cost of personnel and equipment in the process of coal mining, the mining needs to be suspended when the electrical control cabinet inside the mine is repaired and maintained, which causes a certain loss, the electrical control cabinet for coal mine electromechanical can rotate the mounting rack 2 installed with electronic elements and devices to a certain angle and extend to the outside of the shell 1 during maintenance, facilitate the lighting and operation of the workers, greatly improve the efficiency, shorten the maintenance and repair period, facilitate the coal mining, and reduce the loss caused by the suspension of mining.
[0026] In an implementable mode, the activity assembly 3 comprises a first limiting frame 31, a first rotating shaft 32, a tension spring 33 and a limiting groove 34, the first limiting frame 31 is fixedly connected above the inner wall of the shell 1; the first rotating shaft 32 is movably connected to the inner wall of the first limiting frame 31 and is fixedly connected above the side of the mounting rack 2; the two ends of the tension spring 33 are respectively connected to the outer wall of the first rotating shaft 32 and the inner wall of the shell 1; the limiting groove 34 is opened in the first limiting frame 31 and forms a U-shaped sliding groove with the first limiting frame 31; wherein the first limiting frame 31 and the first rotating shaft 32 cooperate to realize the sliding of the mounting rack 2 inside the shell 1, when the first rotating shaft 32 moves to the limiting groove 34, the tension spring 33 gives the first rotating shaft 32 a pulling force inside the limiting groove 34.
[0027] In the specific implementation process, it is particularly worth pointing out that the inner wall of the first limiting frame 31 reserves a sliding groove for the rotation and sliding of the first rotating shaft 32, the cross section of the first rotating shaft 32 can be designed as a circle, which is beneficial to reduce the friction between the first rotating shaft 32 and the inner wall of the first limiting frame 31, the function of the tension spring 33 is to give the first rotating shaft 32 a pulling force towards the inside of the shell 1 at all times, thus ensuring that when the external force is lost, the first rotating shaft 32 drives the mounting rack 2 to return to the original position, that is, abutting against one side of the inner wall of the first limiting frame 31 inside the shell 1, the setting of the limiting groove 34 realizes that after the top of the mounting rack 2 is pulled out to a specified position, the first rotating shaft 32 is clamped into the inside of the limiting groove 34, at this time, under the action of the tension spring 33, the first rotating shaft 32 is stable inside the limiting groove 34 and cannot return to the inside of the first limiting frame 31, that is, the top of the mounting rack 2 is fixed at this position and can only rotate, avoiding that the mounting rack 2 is accidentally retracted into the inside of the shell 1 during the maintenance process of the staff.
[0028] In an implementable mode, the limiting assembly 4 comprises a second limiting frame 41 and a second rotating shaft 42, the second limiting frame 41 is fixedly connected below the inner wall of the shell 1; the second rotating shaft 42 is movably connected to the inner wall of the second limiting frame 41 and is fixedly connected below the side of the mounting rack 2; wherein the second limiting frame 41 cooperates with the second rotating shaft 42 to limit the lower part of the mounting rack 2, and through the front opening of the second limiting frame 41, the separation of the second rotating shaft 42 and the second limiting frame 41 is realized.
[0029] In the specific implementation process, it is particularly worth pointing out that the setting of the second limiting frame 41 and the second rotating shaft 42 plays a limiting role on the lower part of the mounting rack 2, and the front of the second limiting frame 41 is open, so when the first rotating shaft 32 enters the inside of the limiting groove 34, the second rotating shaft 42 can be slid out of the inside of the second limiting frame 41, that is, the rotation of the mounting rack 2 is realized, and when the mounting rack 2 is normally installed inside the shell 1, the function of the second limiting frame 41 and the second rotating shaft 42 is to ensure that the mounting rack 2 has effective limiting inside the shell 1.
[0030] In an implementable mode, the fixing assembly 5 comprises a blocking piece 51, a rubber pad 52, a support 53, a compression spring 54 and a plug rod 55, the blocking piece 51 is arranged on the front side of the second rotating shaft 42; the rubber pad 52 is fixedly connected to the side of the blocking piece 51 close to the second rotating shaft 42 and is in close contact with the surface of the second rotating shaft 42; the support 53 is arranged below the blocking piece 51 and is fixedly connected to the inner wall of the shell 1 below; the compression spring 54 is abutted between the support 53 and the blocking piece 51; the plug rod 55 is sequentially inserted into the inner wall of the compression spring 54 and the support 53 from top to bottom and the top is fixedly connected to the bottom of the blocking piece 51; wherein the compression spring 54 gives the blocking piece 51 an upward close force, the rubber pad 52 on the surface of the blocking piece 51 is in close contact with the outer wall of the second rotating shaft 42 under the limiting of the plug rod 55, and the second limiting frame 41 fixes the lower half of the mounting rack 2.
[0031] In the specific implementation process, it is worth pointing out that the blocking piece 51 supports the rubber pad 52, and the rubber pad 52 is used to increase the friction between the blocking piece 51 and the second rotating shaft 42, so that when the mounting rack 2 is normally installed in the interior of the shell 1, that is, the second rotating shaft 42 is located in the inner wall of the end of the second limiting frame 41 located in the deep part of the interior of the shell 1, the blocking piece 51 drives the plug rod 55 fixedly connected to the bottom thereof to move upward under the action of the support 53 and the compression spring 54, the rubber pad 52 on the surface of the blocking piece 51 is abutted against the side of the second rotating shaft 42 close to the opening of the front side of the shell 1, and the second rotating shaft 42 can be effectively fixed due to the limiting of the support 53, at this time, the upper part of the mounting rack 2 is subjected to the tension of the tension spring 33 and the lower part is subjected to the blocking of the blocking piece 51, so that the stability in the interior of the shell 1 is realized.
[0032] In an implementable mode, the lower part of the mounting rack 2 is provided with a support rod 6 hinged to the bottom of the inner wall of the shell 1.
[0033] In the specific implementation process, it is worth pointing out that the support rod 6 is arranged to support the bottom of the mounting rack 2 when the lower part of the mounting rack 2 is rotated out of the interior of the shell 1, to ensure the stability of the inclination angle and facilitate the operation of the staff on the surface of the mounting rack 2, such as disassembly and maintenance of the electronic elements.
[0034] In an implementable mode, the shell 1 is provided with a ventilation assembly 7, which comprises a filter screen 71, a frame 72, a protrusion 73, an opening 74, a cooling fan 75 and a protective cover 76. The filter screen 71 is arranged at the bottom of the inner wall of the shell 1. The frame 72 is embedded in the bottom of the inner wall of the shell 1 and is fixed to the outer wall of the filter screen 71. The protrusion 73 is arranged on the outer wall of the frame 72. The opening 74 is arranged on the bottom of the inner wall of the shell 1 and is matched with the protrusion 73. The cooling fan 75 is installed above the side of the shell 1 and penetrates the side wall of the shell 1. The protective cover 76 is fixed to the side of the shell 1 and is located above the cooling fan 75. The cooling fan 75 forms a downward air duct through the filter screen 71, which is beneficial to the overall heat dissipation of the shell 1. The protrusion 73 and the opening 74 are beneficial to the assembly of the frame 72 and the shell 1. The protective cover 76 protects the cooling fan 75.
[0035] In the specific implementation process, it is particularly worth pointing out that the specific material and mesh number of the filter screen 71 are not limited, and the purpose is to ventilate and prevent dust in the mine from entering the inside of the shell 1 to protect the electronic components inside. The design of the frame 72, the protrusion 73 and the opening 74 is to facilitate the assembly and replacement of the filter screen 71 and the shell 1. The specific model of the cooling fan 75 is not limited, which meets the use requirements. The filter screen 71 is arranged at the bottom of the shell 1, and the cooling fan 75 is arranged at the upper position of the side of the shell 1. The purpose of this design is that the cooling fan 75 draws external air from the filter screen 71 into the inside of the shell 1, and the airflow flows from bottom to top, sequentially cooling the electronic components inside the shell 1, improving the cooling effect and air flow effect. The purpose of the protective cover 76 is to prevent large stones, tools and other objects inside the mine from damaging the cooling fan 75 and ensure the normal use of the cooling fan 75.
[0036] Working principle:
[0037] When the electronic components and devices inside the shell 1 need to be maintained or repaired, first pull down the plug rod 55, the plug rod 55 moves downward along the support 53, and drives the blocking piece 51 and the rubber pad 52 on the surface thereof and the second rotating shaft 42 to separate, at this time, the mounting rack 2 can be pulled, so that the first rotating shaft 32 above the mounting rack 2 and the second rotating shaft 42 below the mounting rack 2 move along the first limiting frame 31 and the second limiting frame 41 respectively, when the second rotating shaft 42 and the second limiting frame 41 are separated, the first rotating shaft 32 is driven by the mounting rack 2 to enter the inside of the limiting groove 34, at this time, under the action of the tension spring 33, the tension spring 33 cannot pull the first rotating shaft 32 back, that is, the mounting rack 2 is located on the front opening surface of the shell 1, then the mounting rack 2 is rotated, the first rotating shaft 32 is rotated in the inside of the limiting groove 34, and the support rod 6 is rotated to support the mounting rack 2, specifically, the end of the support rod 6 can be clamped into the mounting hole reserved on the surface of the mounting rack 2 but not used, so as to ensure the stability of the mounting rack 2, at this time, the worker can conveniently repair and maintain the electronic components and devices installed on the surface of the mounting rack 2, the operation space is large, and the lighting is also convenient;
[0038] After the repair is completed, the support rod 6 is restored to the original position, the second rotating shaft 42 below the side surface of the mounting rack 2 is installed into the second limiting frame 41, and the first rotating shaft 32 is removed from the inside of the limiting groove 34, at this time, under the action of the tension spring 33 and the manual support of the worker, the mounting rack 2 is restored to the original position, that is, the first rotating shaft 32 and the second rotating shaft 42 move to the first limiting frame 31 and the second limiting frame 41 respectively, and are located on the inner wall on one side of the shell 1, the top is limited by the tension spring 33, and the bottom is limited by the blocking piece 51, so as to realize the effective fixation of the mounting rack 2 in the shell 1;
[0039] When used normally, the cooling fan 75 draws external air into the shell 1 from the filter screen 71, and the air flow is from bottom to top, and sequentially cools the electronic components in the shell 1, so as to improve the cooling effect and air flow effect, and the protective cover 76 is used to prevent large stones, tools and the like in the mine from damaging the cooling fan 75, so as to ensure the normal use of the cooling fan 75.
[0040] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. An electrical control cabinet for coal mine electromechanical applications, comprising a housing (1), characterized in that: The housing (1) is provided with a mounting bracket (2) inside, and the electrical control cabinet for coal mine electromechanical applications also includes: The active component (3) is disposed on the upper side of the mounting bracket (2); A limiting component (4) is disposed on the lower side of the mounting bracket (2); A fixing component (5) is disposed between the limiting component (4) and the mounting bracket (2); The active component (3) works with the limiting component (4) to support and adjust the mounting bracket (2), and the mounting bracket (2) is fixed inside the outer shell (1) by the fixing component (5).
2. The electrical control cabinet for coal mine electromechanical applications according to claim 1, characterized in that: The active component (3) includes: The first limiting frame (31) is fixed to the upper part of the inner wall of the outer shell (1); The first rotating shaft (32) is movably connected to the inner wall of the first limiting frame (31) and fixed to the upper side of the mounting bracket (2); A tension spring (33) is connected at both ends to the outer wall of the first rotating shaft (32) and the inner wall of the outer casing (1), respectively. A limiting groove (34) is formed in the first limiting frame (31) and forms a U-shaped sliding groove with the first limiting frame (31); The first limiting frame (31) and the first rotating shaft (32) cooperate to enable the mounting bracket (2) to slide inside the outer shell (1). When the first rotating shaft (32) moves to the limiting groove (34), the tension spring (33) gives the first rotating shaft (32) a tension force that can be applied inside the limiting groove (34).
3. The electrical control cabinet for coal mine electromechanical applications according to claim 2, characterized in that: The limiting component (4) includes: The second limiting frame (41) is fixed to the lower part of the inner wall of the outer shell (1); The second rotating shaft (42) is movably connected to the inner wall of the second limiting frame (41) and fixed to the lower side of the mounting bracket (2); The second limiting frame (41) works with the second rotating shaft (42) to limit the lower part of the mounting bracket (2), and the second rotating shaft (42) and the second limiting frame (41) are separated through the front opening of the second limiting frame (41).
4. The electrical control cabinet for coal mine electromechanical applications according to claim 3, characterized in that: The fixing component (5) includes: A blocking element (51) is disposed on the front side of the second rotating shaft (42); A rubber pad (52) is fixed to the side of the blocking member (51) near the second rotating shaft (42) and fits into the surface of the second rotating shaft (42); The support (53) is located below the blocking member (51) and fixed to the lower inner wall of the outer shell (1); A compression spring (54) is pressed against the support (53) and the stop (51); The insert rod (55) is inserted into the inner wall of the compression spring (54) and the support (53) from top to bottom, and its top is fixed to the bottom of the blocking member (51); The compression spring (54) applies an upward force to the blocking member (51), and the rubber pad (52) on the surface of the blocking member (51) is attached to the outer wall of the second rotating shaft (42) under the limit of the insertion rod (55), and the lower half of the mounting bracket (2) is fixed in conjunction with the second limiting frame (41).
5. The electrical control cabinet for coal mine electromechanical applications according to claim 4, characterized in that: A support rod (6) is provided below the mounting bracket (2) and hinged to the bottom of the inner wall of the outer casing (1).
6. The electrical control cabinet for coal mine electromechanical applications according to claim 1, characterized in that: A ventilation assembly (7) is provided on the outer casing (1), the ventilation assembly (7) comprising: A filter screen (71) is disposed at the bottom of the inner wall of the outer casing (1); The frame (72) is embedded in the bottom of the inner wall of the outer shell (1) and fixed to the outer wall of the filter (71); A protrusion (73) is provided on the outer wall of the frame (72); A notch (74) is formed at the bottom of the inner wall of the outer shell (1) and fits with the protrusion (73); A cooling fan (75) is installed on the upper side of the housing (1) and penetrates the side wall of the housing (1); The protective cover (76) is fixed to the side of the outer shell (1) and located above the cooling fan (75); The cooling fan (75) forms an air duct from bottom to top through the filter (71), which is conducive to the overall heat dissipation inside the outer shell (1). The protrusion (73) and the notch (74) are conducive to the assembly of the frame (72) and the outer shell (1). The protective cover (76) protects the cooling fan (75).