Protective mechanism of numerical control machining center

Abstract

The utility model relates to the technical field of numerical control machining equipment, in particular to a protection mechanism of a numerical control machining center, which comprises a bottom plate, a fixed shell, a shielding shell, a support plate, a shielding mechanism, a wiping mechanism and a heat dissipation mechanism, guide notches are formed in four adjacent side walls of the bottom plate, and the bottom of the fixed shell is fixedly connected with the top of the bottom plate. According to the device, the first traction assemblies are arranged at the bottoms of the two moving plates, the two flexible shielding plates are conveniently pulled to be closed through the first traction assemblies, the rectangular notch is shielded, the flexible shielding plates are conveniently pulled into the containing groove through the two second traction assemblies, and then the rectangular notch is conveniently opened and exposed; and when the flexible shielding plate moves towards the interior of the storage groove, scraps adhering to the surfaces of the flexible shielding plate and the flexible transparent plate can be scraped off through the side walls of the rectangular notches, cleaning is more convenient and faster, and the scraps flow to the position between the fixing shell and the supporting plate and slide out from the four guide notches, so that the scraps are conveniently collected and treated.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining equipment technology, specifically a protective mechanism for a CNC machining center. Background Technology

[0002] Numerical control (CNC) machining refers to a process of machining parts on CNC machine tools. While the overall process specifications for CNC machining are consistent with those for traditional machine tool machining, significant changes have occurred. It is an effective way to solve problems such as diverse part types, small batch sizes, complex shapes, and high precision requirements, and to achieve high-efficiency and automated machining. Currently, when CNC machine tools are in operation, the glass of the protective mechanism easily accumulates a large amount of debris and cutting fluid. Since the protective door cannot be opened for cleaning, this obstructs the operator's view, preventing them from accurately observing the product's machining progress. Utility Model Content

[0003] The purpose of this utility model is to provide a protective mechanism for CNC machining centers to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A protective mechanism for a CNC machining center, comprising:

[0006] The base plate has guide notches on all four adjacent side walls.

[0007] The fixed shell is fixedly connected at its bottom to the top of the base plate;

[0008] The shielding shell is fixedly connected to the top of the fixed shell at its bottom. A rectangular notch is provided on one side of the shielding shell, and a storage groove is provided on both inner sidewalls of the rectangular notch. A rectangular hole and two connecting holes are provided on the top of the shielding shell, and a sliding groove is provided on the inner top surface of the rectangular notch.

[0009] The support plate is fixedly connected at the middle position of the bottom and the top of the base plate;

[0010] A shielding mechanism is provided on the shielding shell;

[0011] A wiping mechanism is fixedly connected to the shielding shell;

[0012] A heat dissipation mechanism is located on the top of the shielding shell.

[0013] Furthermore, the blocking mechanism includes:

[0014] Two movable plates are slidably connected to the inside of the rectangular notch. A slider is fixed to the top of the movable plate and is slidably connected to the slide groove. A traction component is provided at the bottom of the two movable plates.

[0015] Two flexible shielding plates are fixedly connected at one end to the two movable plates respectively. The two flexible shielding plates are slidably connected to the storage slots at corresponding positions. A connection notch is opened at one end of each flexible shielding plate. A traction component 2 is provided at the bottom of the other end of each of the two flexible shielding plates.

[0016] Two flexible transparent panels are fixed inside the two connecting notches, respectively.

[0017] Preferably, the traction component one includes:

[0018] Two L-shaped plates are fixedly connected at their tops to the bottoms of the two movable plates, and the tops of the L-shaped plates are slidably connected to the top of the inner side of the fixed shell. A traction belt is glued and fixed to one inner side wall of the L-shaped plate.

[0019] A fixing plate is fixedly connected to the inside of the fixing shell. Two round rods are rotatably connected to the fixing plate. A pulley is fixedly sleeved on the top of the two round rods, and a belt body is connected between the two pulleys. A one-way bearing is fixedly sleeved on the bottom of the two round rods, and the one-way bearing is bonded and fixed to one end of the traction belt at the corresponding position.

[0020] Motor 1 is fixedly connected at its bottom to the inner bottom surface of the fixed housing, and the output end of Motor 1 is fixedly connected to the bottom of the round rod at the corresponding position.

[0021] Preferably, the second traction component includes:

[0022] The top of the sliding rod is fixedly connected to the bottom of the other end of the flexible shielding plate. The top of the sliding rod is slidably connected to the top of the inner side of the fixed shell. A second traction belt is bonded and fixed to the outer wall of the sliding rod, and the second traction belt is located inside the fixed shell.

[0023] Motor 2 is fixedly connected at its bottom to the inner bottom surface of the fixed housing;

[0024] One-way bearing two is sleeved and fixed to the outside of the output end of motor two, and the outer wall of one-way bearing two is bonded and fixed to one end of traction belt two.

[0025] Furthermore, the wiping mechanism includes:

[0026] A rectangular shell, the bottom of which is fixedly connected to the top of the shielding shell;

[0027] Two rotating rods are respectively rotatably connected to the two ends of the inner top surface of the rectangular shell;

[0028] Two pulleys are respectively fitted and fixed to the top of the two rotating rods;

[0029] The second belt body is connected to the two second belt pulleys for transmission.

[0030] Motor 3, one end of which is fixedly connected to the top of the rectangular shell, and the output end of motor 3 passes through the side wall of the rectangular shell and is fixedly connected to the top of the rotating rod at the corresponding position;

[0031] Two solenoids are respectively sleeved and fixed to the bottom of the two rotating rods;

[0032] Two connecting plates, one end of which is screwed into the outer side of the two solenoids respectively;

[0033] Two cleaning brushes are respectively fixed inside the two connecting plates, and the cleaning brushes are in contact with the flexible shielding plates at corresponding positions;

[0034] The two limiting plates are fixedly connected to the inner top surface of the shielding shell at their top, and the inside of the limiting plates is slidably connected to one end of the connecting plate at the corresponding position.

[0035] Furthermore, the heat dissipation mechanism includes:

[0036] The outer wall of the rectangular frame is fixedly connected to the inner wall of the rectangular hole;

[0037] A copper plate is fixed inside the rectangular frame;

[0038] Multiple cooling elements are fixedly connected to the top of the copper plate by means of heat absorption surfaces.

[0039] Preferably, a fixing frame is fixedly connected to the top of the rectangular frame, and filter screens are fixedly connected to both ends and sides of the rectangular frame. The top of the fixing frame has multiple round holes, and filter screens are fixedly connected to the inside of the round holes. Cooling fans are fixedly connected to the top surface of the fixing frame at the positions corresponding to the multiple round holes.

[0040] Compared with the prior art, the beneficial effects of this utility model are:

[0041] By setting a traction component one at the bottom of the two movable plates, the traction component one can easily pull the two flexible shielding plates to close, thus covering the rectangular gap. The two traction components two can easily pull the flexible shielding plates into the inside of the storage slot, thereby making it easier to open and expose the rectangular gap. When the flexible shielding plates move into the storage slot, the side wall of the rectangular gap can scrape off the debris adhering to the surface of the flexible shielding plates and the flexible transparent plate, making cleaning more convenient. The debris flows between the fixed shell and the support plate and slides out from the four guide gaps, making it easy to collect and process the debris. Then, by starting the motor three, the cleaning brush moves, and the moving cleaning brush can easily wipe and clean the flexible transparent plate, avoiding obstructing the operator's view and preventing the operator from correctly knowing the processing status of the product.

[0042] By installing a heat dissipation mechanism on the top of the shielding shell and activating multiple cooling plates, the copper plate can absorb heat, and the copper plate can absorb heat from the inside of the shielding shell. This prevents the internal temperature of the shielding shell from becoming too high, which could affect the service life of the CNC machining equipment inside. Furthermore, by activating multiple cooling fans, the cooling plates can dissipate heat, thus ensuring the effectiveness of the cooling plates. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0044] Figure 2 This is a schematic diagram showing the positional relationship between the fixed shell and the shielding shell in this utility model;

[0045] Figure 3 This is a schematic diagram of the shielding shell structure in this utility model;

[0046] Figure 4 This is a schematic diagram of the shielding mechanism in this utility model;

[0047] Figure 5 This is a schematic diagram showing the positional relationship between the fixing plate and the round rod in this utility model;

[0048] Figure 6 This is a schematic diagram showing the positional relationship between the second motor and the second one-way bearing in this utility model;

[0049] Figure 7 This is a schematic diagram of the wiping mechanism in this utility model;

[0050] Figure 8 This is a schematic diagram of the heat dissipation mechanism in this utility model.

[0051] In the diagram: 100, base plate; 101, guide notch; 110, fixed shell; 120, shielding shell; 121, rectangular notch; 122, storage slot; 123, rectangular hole; 124, connecting hole; 125, slide groove; 130, support plate; 200, shielding mechanism; 210, moving plate; 211, slider; 220, flexible shielding plate; 230, flexible transparent plate; 240, L-shaped plate; 241, traction belt one; 250, fixed plate; 251, round rod; 252, pulley one; 253, belt body one; 254, one-way bearing one; 260. Motor 1; 270, Sliding rod; 271, Traction belt 2; 280, Motor 2; 290, One-way bearing 2; 300, Wiping mechanism; 310, Rectangular shell; 320, Rotating rod; 330, Pulley 2; 340, Belt body 2; 350, Motor 3; 360, Screw tube; 370, Connecting plate; 380, Cleaning brush; 390, Limiting plate; 400, Heat dissipation mechanism; 410, Rectangular frame; 420, Fixing bracket; 421, Round hole; 430, Copper plate; 440, Cooling element; 450, Filter 1; 460, Filter 2; 470, Cooling fan. Detailed Implementation

[0052] 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.

[0053] Please see Figure 1-8 In this embodiment of the present invention, a protective mechanism for a CNC machining center includes: a base plate 100, a fixed shell 110, a shielding shell 120, a support plate 130, a shielding mechanism 200, a wiping mechanism 300, and a heat dissipation mechanism 400. Guide notches 101 are provided on the four adjacent side walls of the base plate 100. The bottom of the fixed shell 110 is fixedly connected to the top of the base plate 100, and the bottom of the shielding shell 120 is fixedly connected to the top of the fixed shell 110. A rectangular notch is provided on one side of the shielding shell 120. The rectangular notch 121 has a storage groove 122 on both inner sidewalls. The top of the shielding shell 120 has a rectangular hole 123 and two connecting holes 124. The inner top surface of the rectangular notch 121 has a sliding groove 125. The bottom of the support plate 130 is fixedly connected to the middle position of the top of the base plate 100. The shielding mechanism 200 is set on the shielding shell 120. The wiping mechanism 300 is fixedly connected to the shielding shell 120. The heat dissipation mechanism 400 is set on the top of the shielding shell 120.

[0054] Specifically, the support plate 130 facilitates the installation of CNC machining equipment, and the shielding mechanism 200 facilitates the shielding of the rectangular notch 121. Thus, the shielding shell 120 and the shielding mechanism 200 facilitate the shielding and protection of the CNC machining equipment. The debris splashed from the CNC machining equipment will be shielded by the shielding shell 120 and the shielding mechanism 200 and flow between the fixed shell 110 and the support plate 130, and slide out from the four guide notches 101 for easy collection and processing of debris. When the shielding mechanism 200 is closed, the wiping mechanism 300 facilitates wiping of the shielding mechanism 200, and the heat dissipation mechanism 400 facilitates heat dissipation inside the shielding shell 120. Example

[0055] like Figure 4-6As shown, in this embodiment, the shielding mechanism 200 includes: two movable plates 210, two flexible shielding plates 220, and two flexible transparent plates 230. Both movable plates 210 are slidably connected to the interior of the rectangular notch 121. A slider 211 is fixedly connected to the top of each movable plate 210, and the slider 211 is slidably connected to the groove 125. A traction component is provided at the bottom of each movable plate 210. One end of each of the two flexible shielding plates 220 is fixedly connected to one of the two movable plates 210, and each of the two flexible shielding plates 220 is slidably connected to the corresponding storage groove 122. One end of the sex-protecting panel 220 has a connection notch. At the bottom of the other end of each of the two flexible panels 220, a traction assembly 2 is provided. Two flexible transparent panels 230 are respectively fixed inside the two connection notches. The traction assembly 1 includes: two L-shaped plates 240, a fixing plate 250, and a motor 260. The tops of the two L-shaped plates 240 are respectively fixed to the bottoms of the two movable plates 210. The tops of the L-shaped plates 240 are slidably connected to the top of the inner side of the fixing shell 110. A traction belt 241 is adhered and fixed to one inner wall of the L-shaped plate 240. The fixing plate 250 is connected to the fixing shell 110. The internal fixed connection includes two round rods 251 rotatably connected to the fixed plate 250. A pulley 252 is sleeved and fixed to the top of each round rod 251, and a belt body 253 is connected between the two pulleys 252. A one-way bearing 254 is sleeved and fixed to the bottom of each round rod 251, and the one-way bearing 254 is bonded and fixed to one end of a traction belt 241 at a corresponding position. The bottom of the motor 260 is fixedly connected to the inner bottom surface of the fixed housing 110, and the output end of the motor 260 is fixedly connected to the bottom of the round rod 251 at a corresponding position. The traction assembly two includes a sliding rod. 270, motor 280, and one-way bearing 290; the top of sliding rod 270 is fixedly connected to the bottom of the other end of flexible baffle 220; the top of sliding rod 270 is slidably connected to the top of the inner side of fixed housing 110; traction belt 271 is bonded and fixed to the outer wall of sliding rod 270, and traction belt 271 is located inside fixed housing 110; the bottom of motor 280 is fixedly connected to the inner bottom surface of fixed housing 110; one-way bearing 290 is sleeved and fixed to the outer side of the output end of motor 280; and the outer wall of one-way bearing 290 is bonded and fixed to one end of traction belt 271.

[0056] In this embodiment, two flexible transparent plates 230 facilitate observation of the CNC machining equipment inside the shielding shell 120 when the shielding mechanism 200 is closed. By activating two motors 280, two one-way bearings 290 rotate, thereby winding up the traction belt 271. The winding traction belt 271 pulls the sliding rod 270 and the other end of the flexible shielding plate 220, facilitating the movement of the flexible shielding plate 220 into the receiving groove 122. This allows the rectangular notch 121 to be opened and exposed. As the flexible shielding plate 220 moves into the receiving groove 122, the sidewall of the rectangular notch 121 scrapes off debris adhering to the surfaces of the flexible shielding plate 220 and the flexible transparent plate 230, making cleaning more convenient. Furthermore, it facilitates the removal and reuse of the flexible shielding plate 220 and the flexible transparent plate 230. The movement of the flexible shielding plate 220 will drive the moving plate 210 and the L-shaped plate 240 to move, and with the cooperation of the one-way bearing 254, the traction belt 241 will unfold. When it is necessary to close the rectangular gap 121, the motor 260 is started, which drives the round rod 251 at the corresponding position to rotate. The two round rods 251 and the belt body 253 cooperate to make the two round rods 251 and the two one-way bearings 254 rotate, which facilitates the winding of the two traction belts 241, and then facilitates the repositioning of the L-shaped plate 240, the moving plate 210 and the flexible shielding plate 220 to close the rectangular gap 121.

[0057] like Figure 7 As shown, in this embodiment, the wiping mechanism 300 includes: a rectangular shell 310, two rotating rods 320, two pulleys 330, a belt body 340, a motor 350, two solenoids 360, two connecting plates 370, two cleaning brushes 380, and two limiting plates 390. The bottom of the rectangular shell 310 is fixedly connected to the top of the shielding shell 120. The tops of the two rotating rods 320 are rotatably connected to the two ends of the inner top surface of the rectangular shell 310. The two pulleys 330 are respectively sleeved and fixed to the tops of the two rotating rods 320. The belt body 340 is drivenly connected to the two pulleys 330. One end of the motor 350... The top of the rectangular shell 310 is fixedly connected to the motor 350. The output end of the motor 350 passes through the side wall of the rectangular shell 310 and is fixedly connected to the top of the rotating rod 320 at the corresponding position. The two solenoids 360 are respectively sleeved and fixed to the bottom of the two rotating rods 320. One end of the two connecting plates 370 is respectively screwed and connected to the outside of the two solenoids 360. The two cleaning brushes 380 are respectively fixedly connected to the inside of the two connecting plates 370. The cleaning brushes 380 are in contact with the flexible shielding plate 220 at the corresponding position. The tops of the two limiting plates 390 are fixedly connected to the inner top surface of the shielding shell 120. The inside of the limiting plate 390 is slidably connected to one end of the connecting plate 370 at the corresponding position.

[0058] In practice, by starting motor 350, the rotating rod 320 at the corresponding position is rotated. The two pulleys 330 and belt body 340 drive the two rotating rods 320 and the two screw tubes 360 to rotate. The screw tubes 360 are screwed into the connecting plate 370, and the connecting plate 370 is limited by the limiting plate 390, so that the connecting plate 370 and the cleaning brush 380 can move. The moved cleaning brush 380 can easily wipe and clean the flexible transparent plate 230, avoiding obstructing the operator's view and preventing the operator from correctly knowing the processing status of the product. Example

[0059] Based on Embodiment 1, in order to avoid the internal temperature of the shielding shell 120 being too high and affecting the service life of the CNC machining equipment inside,

[0060] like Figure 8 As shown, in this embodiment, the heat dissipation mechanism 400 includes: a rectangular frame 410, a copper plate 430, and a plurality of cooling chips 440. The outer wall of the rectangular frame 410 is fixedly connected to the inner wall of the rectangular hole 123. The copper plate 430 is fixedly connected to the inside of the rectangular frame 410. The heat absorption surface of the plurality of cooling chips 440 is fixedly connected to the top of the copper plate 430. A fixing frame 420 is fixedly connected to the top of the rectangular frame 410. Filter screens 450 are fixedly connected to both ends and both sides of the rectangular frame 410. A plurality of round holes 421 are opened on the top of the fixing frame 420. Filter screens 460 are fixedly connected inside the round holes 421. Cooling fans 470 are fixedly connected to the top surface of the fixing frame 420 at the positions corresponding to the multiple round holes 421.

[0061] In practice, multiple cooling plates 440 are activated to absorb heat from the copper plate 430 and the copper plate 430 to absorb heat from the interior of the shielding shell 120, thus preventing the interior temperature of the shielding shell 120 from becoming too high and affecting the service life of the CNC machining equipment inside. Then, multiple cooling fans 470 are activated to dissipate heat from the multiple cooling plates 440, thus ensuring the effectiveness of the multiple cooling plates 440.

[0062] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A protective mechanism for a CNC machining center, characterized in that, include: The base plate (100) has guide notches (101) on its four adjacent side walls; The bottom of the fixed shell (110) is fixedly connected to the top of the base plate (100); The shielding shell (120) is fixedly connected to the top of the fixed shell (110) at its bottom. A rectangular notch (121) is provided on one side of the shielding shell (120), and a storage groove (122) is provided on both inner sidewalls of the rectangular notch (121). A rectangular hole (123) and two connecting holes (124) are provided on the top of the shielding shell (120), and a sliding groove (125) is provided on the inner top surface of the rectangular notch (121). The support plate (130) is fixedly connected at the middle position of the bottom and the top of the base plate (100); A shielding mechanism (200) is disposed on the shielding housing (120); A wiping mechanism (300) is fixedly connected to the shielding shell (120); A heat dissipation mechanism (400) is disposed on the top of the shielding shell (120).

2. The protective mechanism of the CNC machining center according to claim 1, characterized in that, The blocking mechanism (200) includes: Two movable plates (210) are slidably connected to the inside of the rectangular notch (121). A slider (211) is fixedly connected to the top of the movable plate (210), and the slider (211) is slidably connected to the slide groove (125). A traction component is provided at the bottom of the two movable plates (210). Two flexible shields (220) are fixed at one end to the two movable plates (210) respectively. The two flexible shields (220) are slidably connected to the corresponding storage slots (122). A connection notch is opened at one end of the flexible shields (220). A traction component 2 is provided at the bottom of the other end of the two flexible shields (220). Two flexible transparent plates (230) are fixedly connected to the inside of two connecting notches, respectively.

3. The protective mechanism for a CNC machining center according to claim 2, characterized in that, The traction component one includes: Two L-shaped plates (240) are fixedly connected at their tops to the bottoms of the two movable plates (210), and the top of the L-shaped plate (240) is slidably connected to the top of the inner side of the fixed shell (110). A traction belt (241) is bonded and fixed to one inner side wall of the L-shaped plate (240). A fixing plate (250) is fixedly connected to the inside of the fixing shell (110). Two round rods (251) are rotatably connected on the fixing plate (250). A pulley (252) is sleeved and fixed on the top of the two round rods (251), and a belt body (253) is connected between the two pulleys (252). A one-way bearing (254) is sleeved and fixed on the bottom of the two round rods (251), and the one-way bearing (254) is bonded and fixed to one end of the traction belt (241) at the corresponding position. The bottom of the motor (260) is fixedly connected to the inner bottom surface of the fixed shell (110), and the output end of the motor (260) is fixedly connected to the bottom of the round rod (251) at the corresponding position.

4. The protective mechanism for a CNC machining center according to claim 2, characterized in that, The second traction component includes: The top of the sliding rod (270) is fixedly connected to the bottom of the other end of the flexible baffle (220), the top of the sliding rod (270) is slidably connected to the top of the inner side of the fixed shell (110), and a second traction belt (271) is bonded and fixed to the outer wall of the sliding rod (270), and the second traction belt (271) is located inside the fixed shell (110). The bottom of the second motor (280) is fixedly connected to the inner bottom surface of the fixed shell (110); One-way bearing two (290) is sleeved and fixed to the outside of the output end of motor two (280), and the outer wall of one-way bearing two (290) is bonded and fixed to one end of traction belt two (271).

5. The protective mechanism of the CNC machining center according to claim 1, characterized in that, The wiping mechanism (300) includes: A rectangular shell (310) is fixedly connected at its bottom to the top of the shielding shell (120); Two rotating rods (320) are rotatably connected at their top ends to the two ends of the inner top surface of the rectangular shell (310); Two pulleys (330) are respectively fitted and fixed to the top of the two rotating rods (320); The belt body 2 (340) is connected to the two pulleys 2 (330) for transmission; Motor 3 (350) is fixedly connected at one end to the top of the rectangular shell (310), and the output end of motor 3 (350) passes through the side wall of the rectangular shell (310) and is fixedly connected to the top of the rotating rod (320) at the corresponding position. Two solenoids (360) are respectively sleeved and fixed to the bottom of the two rotating rods (320); Two connecting plates (370) are screwed to the outer sides of the two solenoids (360) at one end respectively; Two cleaning brushes (380) are respectively fixed inside the two connecting plates (370), and the cleaning brushes (380) are in contact with the flexible shielding plate (220) at the corresponding position; The top of each of the two limiting plates (390) is fixedly connected to the inner top surface of the shielding shell (120), and the inside of the limiting plate (390) is slidably connected to one end of the connecting plate (370) at the corresponding position.

6. The protective mechanism of the CNC machining center according to claim 1, characterized in that, The heat dissipation mechanism (400) includes: The outer wall of the rectangular frame (410) is fixedly connected to the inner wall of the rectangular hole (123); A copper plate (430) is fixed inside the rectangular frame (410); Multiple cooling elements (440) have their heat-absorbing surfaces fixedly connected to the top of the copper plate (430).

7. The protective mechanism of the CNC machining center according to claim 6, characterized in that, A fixing frame (420) is fixedly connected to the top of the rectangular frame (410), and filter screens (450) are fixedly connected to both ends and sides of the rectangular frame (410). Multiple round holes (421) are opened on the top of the fixing frame (420), and filter screens (460) are fixedly connected inside the round holes (421). Cooling fans (470) are fixedly connected to the top surface of the fixing frame (420) at the positions corresponding to the multiple round holes (421).

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