Powder cosmetic cake forming device
Patent Information
- Application Number
- CN202522203801.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-18
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-10-18
AI Technical Summary
[0003]然而,现有装置在实际使用中存在一个核心问题:粉料倒入下模模腔后,易因粉料颗粒的流动性差异、倒入时的冲击力等因素,导致粉料在模腔内分布不均(如局部堆积过厚、局部过薄);当上模下压时,分布不均的粉料会使饼体不同区域承受的压力不一致,最终造成饼体密度不均 —— 密度较小的区域易在后续运输或使用中碎裂,密度较大的区域则会影响化妆品的使用触感(如取粉困难),严重影响产品质量
[0017] 1. The container is held in place by the pressing cylinder, preventing it from detaching from the placement trough due to vibration. Because the pressing head is fixed in position, it is vibrated by the pressing head during the up-and-down vibration of the container, which makes the powder evenly distributed. After the vibration stops, the hydraulic pressing component continues to push the top plate down, causing the top plate to move the pressing head down and press it tightly onto the powder, thus pressing the powder into a cake.
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Figure CN224856466U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cosmetic production equipment technology, specifically to a powder cosmetic cake forming device. Background Technology
[0002] In the production process of powder cosmetics (such as loose powder, blush powder, eyeshadow powder, etc.), loose powder needs to be pressed into a fixed shape using a pressing device for subsequent packaging and use. Existing pressing devices typically include a frame, a lower mold mounted on the frame, an upper mold that can move up and down, and a power mechanism to drive the upper mold. During operation, the powder is poured into the cavity of the lower mold, and then the power mechanism drives the upper mold to press down, pressing the powder into a cake shape.
[0003] However, existing devices have a core problem in practical use: after the powder is poured into the lower mold cavity, the powder is easily unevenly distributed in the cavity due to factors such as the difference in the flowability of the powder particles and the impact force during pouring (e.g., some areas are too thick and some areas are too thin). When the upper mold is pressed down, the unevenly distributed powder will cause different areas of the cake to bear different pressures, ultimately resulting in uneven cake density. Areas with lower density are prone to breakage during subsequent transportation or use, while areas with higher density will affect the feel of the cosmetic (e.g., difficulty in picking up powder), seriously affecting product quality. Utility Model Content
[0004] The purpose of this invention is to provide a powder cosmetic cake forming device to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a powder cosmetic cake-forming device, comprising an equipment shell, a worktable disposed inside the equipment shell, a processing fixture disposed on the top of the worktable by bolts, a placement groove being provided on the top of the processing fixture, a container being placed in the placement groove, a vibrating and pressing component disposed inside the equipment shell, an elastic telescopic rod being elastically connected to the equipment shell at the bottom of the worktable, and an upper and lower vibrating component disposed inside the equipment shell, the vibrating end of the upper and lower vibrating component being fixedly connected to the worktable;
[0006] The vibratory pressing component includes a pressing cylinder and a hydraulic pressing assembly. The hydraulic pressing assembly is located on the top of the equipment housing. The bottom end of the pressing cylinder presses against the top edge of the container. A pressing head is slidably disposed inside the pressing cylinder. A top plate is fixedly installed on the top end of the pressing head. The top plate is fixedly connected to the lifting end of the hydraulic pressing assembly. A spring is fixedly installed on the bottom end of the top plate. The bottom end of the spring is fixedly connected to the top of the pressing cylinder. The outer diameter of the bottom end of the top plate is consistent with the inner diameter of the container.
[0007] Furthermore, the hydraulic pressing assembly includes a hydraulic cylinder and a lifting plate. The hydraulic cylinder is fixedly installed on the top of the equipment housing, and the telescopic end of the hydraulic cylinder is fixedly connected to the top of the lifting plate. The lower surface of the lifting plate is fixedly connected to the top plate.
[0008] Furthermore, the hydraulic pressing assembly also includes a guide rod and a guide ring. The guide ring is slidably sleeved on the guide rod and is fixedly connected to the top of the equipment housing. The bottom end of the guide rod is fixedly connected to the top of the lifting plate.
[0009] Furthermore, a limiting ring is fixedly installed on the inner wall of the pressing cylinder. The inner diameter of the limiting ring is larger than the outer diameter of the bottom end of the pressing head, and the limiting ring is located in the middle section of the pressing cylinder.
[0010] Furthermore, the up-and-down vibration component includes a servo motor, the output end of which is fixedly connected to a rotating shaft, and a turntable is fixedly installed at the end of the rotating shaft. A connecting rod is hinged to the edge of the turntable via a pin, and a connecting frame is hinged to the top of the connecting rod via a pin. An integrally formed fixing plate is provided at the top end of the connecting frame. The fixing plate is fixedly installed at the bottom of the workbench, and a shock-absorbing base is fixedly installed on the bottom inner wall of the equipment housing. The top of the shock-absorbing base is detachably connected to the servo motor via bolts.
[0011] Furthermore, the elastic telescopic rod includes a fixed cylinder, the bottom end of which is fixedly connected to the bottom inner wall of the equipment housing. A disc is slidably disposed inside the fixed cylinder, and a second spring is fixedly installed at the bottom end of the disc. The bottom end of the second spring is fixedly connected to the bottom inner wall of the fixed cylinder. A lifting rod is fixedly installed at the top of the disc, and the lifting rod extends out from the fixed cylinder, with its top end fixedly connected to the bottom of the worktable.
[0012] Furthermore, a second limiting ring is fixedly installed on the inner wall of the fixed cylinder. The inner diameter of the second limiting ring is smaller than the outer diameter of the disc, and the second limiting ring is located in the middle section of the fixed cylinder.
[0013] Furthermore, both the workbench and the processing fixture have push-through holes at their bottoms. The inner diameter of the push-through hole is smaller than the outer diameter of the container. A push-through component is provided below the workbench. The push-through component includes an electric telescopic rod. The bottom end of the electric telescopic rod is fixedly connected to the bottom inner wall of the equipment housing. A second lifting plate is fixedly connected to the telescopic end of the electric telescopic rod. A push-through rod is fixedly installed on the top of the second lifting plate. The push-through rod is located directly below the push-through hole, and the diameter of the push-through rod is smaller than the inner diameter of the push-through hole.
[0014] Furthermore, the bottom of the pressing head is provided with a flared opening that is smaller at the top and larger at the bottom, and the interior of the flared opening is connected to an exhaust channel that extends to the outside of the pressing head.
[0015] Furthermore, the front of the equipment casing is connected to an opening and closing door via a hinge, and ventilation windows are provided on the left and right outer walls of the equipment casing, with dustproof nets installed inside the ventilation windows.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] 1. The container is held in place by the pressing cylinder, preventing it from detaching from the placement trough due to vibration. Because the pressing head is fixed in position, it is vibrated by the pressing head during the up-and-down vibration of the container, which makes the powder evenly distributed. After the vibration stops, the hydraulic pressing component continues to push the top plate down, causing the top plate to move the pressing head down and press it tightly onto the powder, thus pressing the powder into a cake. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of this utility model;
[0019] Figure 2 This utility model Figure 1 A structural schematic diagram of the front sectional view;
[0020] Figure 3 This utility model Figure 1 A structural schematic diagram of a side sectional view;
[0021] Figure 4 This is a schematic diagram of the structure of the vibratory pressing plate component, worktable, and processing fixture of this utility model;
[0022] Figure 5 This is a structural schematic diagram of the front sectional view of the vibratory pressing and pressing component of this utility model;
[0023] Figure 6 This is a structural schematic diagram of a front sectional view of the pressing cylinder, pressing head, top plate, and spring of this utility model;
[0024] Figure 7 This utility model Figure 6 A schematic diagram of the structure of the enlarged view at point A in the middle;
[0025] Figure 8 This is a structural schematic diagram of the elastic telescopic rod, the upper and lower vibration components, and the material pushing component of this utility model;
[0026] Figure 9 This is a structural schematic diagram of the front sectional view of the elastic telescopic rod of this utility model.
[0027] In the diagram: 1. Equipment casing; 2. Workbench; 3. Machining fixture; 4. Placement slot; 5. Container; 6. Vibrating pressing assembly; 601. Pressing cylinder; 602. Pressing head; 603. Top plate; 604. Spring 1; 605. Hydraulic pressing assembly; 6051. Hydraulic cylinder; 6052. Lifting plate 1; 6053. Guide rod; 6054. Guide ring; 7. Pushing through hole; 8. Upper and lower vibration components; 801. Servo motor; 802. Rotating shaft; 803. 804. Turntable; 805. Connecting rod; 806. Connecting frame; 807. Fixing plate; 908. Elastic telescopic rod; 901. Fixing cylinder; 902. Spring II; 903. Disc; 904. Lifting rod; 10. Pushing component; 1001. Electric telescopic rod; 1002. Lifting plate II; 1003. Pushing rod; 11. Ventilation window; 12. Limiting ring I; 13. Trumpet mouth; 14. Exhaust channel; 15. Shock-absorbing base; 16. Limiting ring II; 17. Opening and closing door. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0029] Please see Figures 1-9 This utility model provides a technical solution: a powder cosmetic cake forming device, including a device shell 1, a workbench 2 is provided inside the device shell 1, a processing fixture 3 is installed on the top of the workbench 2 by bolts, a placement groove 4 is opened on the top of the processing fixture 3, a container 5 is placed in the placement groove 4, a vibrating and pressing component 6 is provided inside the device shell 1, the bottom of the workbench 2 is elastically connected to the device shell 1 by an elastic telescopic rod 9, and an upper and lower vibration component 8 is provided inside the device shell 1, the vibration end of the upper and lower vibration component 8 is fixedly connected to the workbench 2;
[0030] The vibratory pressing component 6 includes a pressing cylinder 601 and a hydraulic pressing assembly 605. The hydraulic pressing assembly 605 is located on the top of the equipment housing 1. The bottom end of the pressing cylinder 601 presses against the top edge of the container 5. A pressing head 602 is slidably disposed inside the pressing cylinder 601. A top plate 603 is fixedly installed on the top end of the pressing head 602. The top plate 603 is fixedly connected to the lifting end of the hydraulic pressing assembly 605. A spring 604 is fixedly installed on the bottom end of the top plate 603. The bottom end of the spring 604 is fixedly connected to the top of the pressing cylinder 601. The outer diameter of the bottom end of the top plate 603 is the same as the inner diameter of the container 5. The hydraulic pressing assembly 605 drives the top plate 603 to move downward, thereby causing the top plate 603 to push the spring. 604, then push the pressing cylinder 601 to press the pressing cylinder 601 against the top edge of the container 5. Then, the up and down vibration component 8 vibrates the worktable 2, which in turn drives the processing fixture 3 to vibrate up and down. The container 5 is pressed down by the pressing cylinder 601, so that the container 5 will not fall out of the placement groove 4 under vibration. Then, because the position of the pressing head 602 is fixed, it will be vibrated by the pressing head 602 during the up and down vibration of the container 5. The powder is evenly distributed by the vibration. After the vibration stops, the hydraulic pressing component 605 continues to push the top plate 603 down, so that the top plate 603 drives the pressing head 602 down and then presses it tightly on the powder, so that the powder can be pressed into a cake.
[0031] The hydraulic pressing assembly 605 includes a hydraulic cylinder 6051 and a lifting plate 6052. The hydraulic cylinder 6051 is fixedly installed on the top of the equipment housing 1. The telescopic end of the hydraulic cylinder 6051 is fixedly connected to the top of the lifting plate 6052. The lower surface of the lifting plate 6052 is fixedly connected to the top plate 603. The hydraulic cylinder 6051 drives the lifting plate 6052 to rise and fall, thereby pushing the top plate 603 to move down and to move the top plate 603 up to reset.
[0032] The hydraulic pressing assembly 605 also includes a guide rod 6053 and a guide ring 6054. The guide ring 6054 is slidably sleeved on the guide rod 6053 and is fixedly connected to the top of the equipment housing 1. The bottom end of the guide rod 6053 is fixedly connected to the top of the lifting plate 6052. The guide rod 6054 guides and limits the lifting plate 6052 during its lifting process to prevent the lifting plate 6052 from shifting its position.
[0033] A limiting ring 12 is fixedly installed on the inner wall of the pressing cylinder 601. The inner diameter of the limiting ring 12 is larger than the outer diameter of the bottom end of the pressing head 602, and the limiting ring 12 is located in the middle section of the pressing cylinder 601. After pressing, the pressing cylinder 601 needs to be separated from the container 5. The limiting ring 12 makes the pressing head 602 contact the limiting ring 12 after moving up a certain distance. At this time, the pressing head 602 can move up again to drive the limiting ring 12 to move up, thereby driving the pressing cylinder 601 to move up. This avoids the problem that the pressing cylinder 601 is still pressing on the container 5 after the pressing head 602 has risen to the highest position due to the elastic effect of the spring 604.
[0034] The vertical vibration component 8 includes a servo motor 801. The output end of the servo motor 801 is fixedly connected to a rotating shaft 802. A turntable 803 is fixedly installed at the end of the rotating shaft 802. A connecting rod 804 is hinged to the edge of the turntable 803 via a pin. A connecting frame 805 is hinged to the top of the connecting rod 804 via a pin. An integrally formed fixing plate 806 is provided at the top end of the connecting frame 805. The fixing plate 806 is fixedly installed at the bottom of the worktable 2. A shock-absorbing base 15 is fixedly installed on the bottom inner wall of the equipment shell 1. The top of the shock-absorbing base 15 is detached from the servo motor 801 by bolts. The servo motor 801 drives the rotating shaft 802 to rotate. The rotation of the rotating shaft 802 drives the turntable 803 to rotate. During the rotation of the turntable 803, the connecting frame 805 is pulled up and down by the connecting rod 804, which in turn drives the fixing plate 806 to move up and down. The up and down movement of the fixing plate 806 can drive the worktable 2 to move up and down, thus achieving the purpose of vertical vibration.
[0035] The elastic telescopic rod 9 includes a fixed cylinder 901, the bottom end of which is fixedly connected to the bottom inner wall of the equipment housing 1. A disc 903 is slidably arranged inside the fixed cylinder 901. A spring 902 is fixedly installed at the bottom end of the disc 903. The bottom end of the spring 902 is fixedly connected to the bottom inner wall of the fixed cylinder 901. A lifting rod 904 is fixedly installed at the top of the disc 903. The lifting rod 904 extends out of the fixed cylinder 901 and its top end is fixedly connected to the bottom of the worktable 2. The fixed cylinder 901 and the disc 903 are connected by the spring 902, so that the lifting rod 904 can drive the disc 903 to move up and down when subjected to force, thereby compressing and stretching the spring 902 to achieve the function of elastic support for the worktable 2.
[0036] A second limiting ring 16 is fixedly installed on the inner wall of the fixed cylinder 901. The inner diameter of the second limiting ring 16 is smaller than the outer diameter of the disc 903. The second limiting ring 16 is located in the middle section of the fixed cylinder 901. The second limiting ring 16 is set to limit the maximum downward movement of the disc 903. That is, when the pressing head 602 presses down the powder, the disc 903 falls on the second limiting ring 16 to ensure support for the worktable 2.
[0037] Both the workbench 2 and the processing fixture 3 have a push-through hole 7 at their bottom. The inner diameter of the push-through hole 7 is smaller than the outer diameter of the container 5. A push-through component 10 is provided below the workbench 2. The push-through component 10 includes an electric telescopic rod 1001. The bottom end of the electric telescopic rod 1001 is fixedly connected to the bottom inner wall of the equipment housing 1. The telescopic end of the electric telescopic rod 1001 is fixedly connected to a lifting plate 1002. A push-through rod 1003 is fixedly installed on the top of the lifting plate 1002. The push-through rod 1003 is located directly below the push-through hole 7, and the diameter of the push-through rod 1003 is smaller than the inner diameter of the push-through hole 7. After the pressing is completed, the electric telescopic rod 1001 can be opened to drive the lifting plate 1002 to rise, so that the push-through rod 1003 passes through the push-through hole 7 and then extends into the placement groove 4, pushing the container 5 out of the placement groove 4.
[0038] The bottom of the pressing head 602 is provided with a flared opening 13 that is smaller at the top and larger at the bottom. The inside of the flared opening 13 is connected to an exhaust channel 14, which extends to the outside of the pressing head 602. During the process of the pressing head 602 moving up and down relative to the pressing cylinder 601, the ventilation channel formed by the flared opening 13 and the exhaust channel 14 can ensure that the air in the space formed by the pressing cylinder 601, the pressing head 602, and the holding container 5 can be discharged and drawn in, ensuring the balance of internal and external air pressure. Moreover, because the flared opening 13 is larger at the top and smaller at the bottom, it can reduce the amount of powder entering the exhaust channel 14, and can also better shake the powder off from the flared opening 13 during the vibration process.
[0039] The front of the equipment casing 1 is connected to an opening and closing door 17 via a hinge. Ventilation windows 11 are provided on the left and right outer walls of the equipment casing 1, and dustproof nets are installed inside the ventilation windows 11.
[0040] Working Principle: In use, the container 5 containing powder is placed into the placement slot 4, and then the processing fixture 3 is placed on the worktable 2 and secured with bolts. After closing the opening / closing door 17, the hydraulic cylinder 6051 is activated to move the lifting plate 6052 down to the first height. At this time, the clamping cylinder 601 presses down on the top edge of the container 5. Then, the servo motor 801 is activated to drive the rotating shaft 802 to rotate. The rotation of the rotating shaft 802 drives the turntable 803 to rotate. During the rotation of the turntable 803, the connecting rod 804 pulls the connecting frame 805 to move up and down reciprocally, which in turn drives the fixed plate 806 to move up and down reciprocally. The up and down movement of the fixed plate 806 drives the worktable 2 to move up and down reciprocally, causing the worktable 2 to vibrate up and down, which in turn drives the processing fixture 3 to vibrate up and down. The container 5 is pressed down by the clamping cylinder 601, preventing the container 5 from... Under vibration, it will detach from the placement groove 4. Then, because the pressing head 602 is fixed in position, it will be vibrated by the pressing head 602 during the up-and-down vibration of the holding container 5. The vibration makes the powder evenly distributed. After the vibration stops, the hydraulic cylinder 6051 is opened to drive the lifting plate 6052 to move down, so that the top plate 603 drives the pressing head 602 to move down and then press it tightly on the powder to press the powder into a cake. After the cake is pressed, the hydraulic cylinder 6051 is opened to drive the lifting plate 6052 to move up and reset, thereby driving the pressing cylinder 601 to separate from the holding container 5, leaving a large gap between them. The electric telescopic rod 1001 is opened to drive the lifting plate 1002 to rise, so that the push rod 1003 passes through the push hole 7 and then extends into the placement groove 4 to push the holding container 5 out of the placement groove 4.
[0041] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
Claims
1. A powder cosmetic forming device, comprising a housing (1), characterized in that: The equipment housing (1) is provided with a workbench (2). The top of the workbench (2) is provided with a processing fixture (3) by bolts. The top of the processing fixture (3) is provided with a placement groove (4). A container (5) is placed in the placement groove (4). The equipment housing (1) is provided with a vibrating pressing component (6). The bottom of the workbench (2) is elastically connected to the equipment housing (1) by an elastic telescopic rod (9). The equipment housing (1) is provided with an upper and lower vibration component (8). The vibration end of the upper and lower vibration component (8) is fixedly connected to the workbench (2). The vibratory pressing component (6) includes a pressing cylinder (601) and a hydraulic pressing assembly (605). The hydraulic pressing assembly (605) is located on the top of the equipment housing (1). The bottom end of the pressing cylinder (601) is pressed against the top edge of the container (5). A pressing head (602) is slidably arranged inside the pressing cylinder (601). A top plate (603) is fixedly installed on the top end of the pressing head (602). The top plate (603) is fixedly connected to the lifting end of the hydraulic pressing assembly (605). A spring (604) is fixedly installed on the bottom end of the top plate (603). The bottom end of the spring (604) is fixedly connected to the top of the pressing cylinder (601). The outer diameter of the bottom end of the top plate (603) is consistent with the inner diameter of the container (5).
2. The powder cosmetic cake forming device according to claim 1, characterized in that: The hydraulic pressing assembly (605) includes a hydraulic cylinder (6051) and a lifting plate (6052). The hydraulic cylinder (6051) is fixedly installed on the top of the equipment housing (1). The telescopic end of the hydraulic cylinder (6051) is fixedly connected to the top of the lifting plate (6052). The lower surface of the lifting plate (6052) is fixedly connected to the top plate (603).
3. The powder cosmetic cake forming device according to claim 2, characterized in that: The hydraulic pressing assembly (605) also includes a guide rod (6053) and a guide ring (6054). The guide ring (6054) is slidably sleeved on the guide rod (6053) and is fixedly connected to the top of the equipment housing (1). The bottom end of the guide rod (6053) is fixedly connected to the top of the lifting plate (6052).
4. The powder cosmetic cake forming device according to claim 1, characterized in that: The inner wall of the pressing cylinder (601) is fixedly installed with a limiting ring (12). The inner diameter of the limiting ring (12) is larger than the outer diameter of the bottom end of the pressing head (602), and the limiting ring (12) is located in the middle section of the pressing cylinder (601).
5. The powder cosmetic cake forming device according to claim 1, characterized in that: The up-and-down vibration component (8) includes a servo motor (801), the output end of which is fixedly connected to a rotating shaft (802), and a turntable (803) is fixedly installed at the end of the rotating shaft (802). A connecting rod (804) is hinged to the edge of the turntable (803) by a pin, and a connecting frame (805) is hinged to the top of the connecting rod (804) by a pin. An integrally formed fixing plate (806) is provided at the top end of the connecting frame (805), and the fixing plate (806) is fixedly installed at the bottom of the workbench (2). A shock-absorbing base (15) is fixedly installed on the bottom inner wall of the equipment shell (1), and the top of the shock-absorbing base (15) is detached and installed from the servo motor (801) by bolts.
6. The powder cosmetic cake forming device according to claim 1, characterized in that: The elastic telescopic rod (9) includes a fixed cylinder (901), the bottom end of which is fixedly connected to the bottom inner wall of the equipment housing (1), a disc (903) is slidably arranged inside the fixed cylinder (901), a second spring (902) is fixedly installed at the bottom end of the disc (903), the bottom end of the second spring (902) is fixedly connected to the bottom inner wall of the fixed cylinder (901), and a lifting rod (904) is fixedly installed at the top of the disc (903). The lifting rod (904) extends out from the fixed cylinder (901), and the top end of the lifting rod (904) is fixedly connected to the bottom of the workbench (2).
7. The powder cosmetic cake-forming device according to claim 6, characterized in that: The inner wall of the fixed cylinder (901) is fixedly installed with a second limiting ring (16). The inner diameter of the second limiting ring (16) is smaller than the outer diameter of the disc (903). The second limiting ring (16) is located in the middle section of the fixed cylinder (901).
8. The powder cosmetic cake forming device according to claim 1, characterized in that: The bottom of the workbench (2) and the processing fixture (3) are provided with a pusher hole (7). The inner diameter of the pusher hole (7) is smaller than the outer diameter of the container (5). A pusher component (10) is provided below the workbench (2). The pusher component (10) includes an electric telescopic rod (1001). The bottom end of the electric telescopic rod (1001) is fixedly connected to the bottom inner wall of the equipment shell (1). The telescopic end of the electric telescopic rod (1001) is fixedly connected to a lifting plate (1002). A pusher rod (1003) is fixedly installed on the top of the lifting plate (1002). The pusher rod (1003) is located directly below the pusher hole (7), and the diameter of the pusher rod (1003) is smaller than the inner diameter of the pusher hole (7).
9. The powder cosmetic cake forming device according to claim 1, characterized in that: The bottom of the pressing head (602) is provided with a flared opening (13) that is smaller at the top and larger at the bottom. The inside of the flared opening (13) is connected to an exhaust channel (14), which extends to the outside of the pressing head (602).
10. The powder cosmetic cake forming device according to claim 1, characterized in that: The front of the equipment housing (1) is connected to an opening and closing door (17) by a hinge. Ventilation windows (11) are provided on the left and right outer walls of the equipment housing (1), and a dustproof net is provided inside the ventilation window (11).