A power distribution cabinet and a preparation device thereof

Abstract

The application belongs to the technical field of power distribution cabinet production, and particularly relates to a power distribution cabinet and a preparation device thereof. In view of the problem that the existing power distribution cabinet preparation device cannot recycle the waste heat generated by injection molding cooling, the following scheme is proposed, which comprises a bearing platform, a frame-shaped isolation door, four symmetrical hydraulic rods arranged on the frame-shaped isolation door, an output end of each hydraulic rod being fixedly connected with a same movable mold, an external part of the movable mold being provided with a fixed mold, the movable mold being attached to the fixed mold, an injection pipe being arranged on a side of the fixed mold away from the movable mold, a screw rod being arranged in the injection pipe, a feeding hopper being communicated with the injection pipe. The disclosed power distribution cabinet and preparation device thereof can effectively recycle the waste heat of the cooling liquid used for temperature reduction and mold stripping from the movable mold and the fixed mold, and can be used for preheating the plastic particles as raw materials, so that the overall heating demand of the device is reduced, the utilization rate of preheating is increased, and the energy-saving effect of the device is improved.

Description

Technical Field

[0001] This invention relates to the field of power distribution cabinet manufacturing technology, and in particular to a power distribution cabinet and its manufacturing apparatus. Background Technology

[0002] Distribution cabinets are divided into power distribution cabinets, lighting distribution cabinets, and metering cabinets, and are the final stage equipment in a power distribution system. Distribution cabinets are a general term for motor control centers, and are used in situations where the load is relatively dispersed and there are few circuits.

[0003] When existing distribution cabinet manufacturing equipment uses injection molding, coolant flows between the moving and fixed molds to aid in demolding and shaping. The heat carried away by the coolant is often released to the outside, resulting in heat waste and reducing the energy-saving effect of the equipment. Summary of the Invention

[0004] This invention discloses a power distribution cabinet and its manufacturing apparatus, aiming to solve the technical problem in the prior art that existing power distribution cabinet manufacturing apparatuses cannot recover and utilize the waste heat generated by injection molding cooling.

[0005] The present invention provides a power distribution cabinet manufacturing device, including a support plate;

[0006] A frame-shaped isolation door is provided with four symmetrical hydraulic rods. The output ends of the hydraulic rods are fixedly connected to the same moving mold. A fixed mold is provided outside the moving mold. The moving mold and the fixed mold are fitted together. An injection pipe is provided on the side of the fixed mold away from the moving mold, and a helical rod is provided inside the injection pipe.

[0007] The feed hopper is connected to the injection pipe, and three equally spaced heaters are provided on the outside of the injection pipe;

[0008] A power unit, the output end of which is connected to a screw rod;

[0009] The waste heat recovery module includes a closed box with three equidistant heat-conducting plates on it. An oil storage tank is installed outside the heat-conducting plates, and a spiral tube is fixedly connected to the inner wall of the feed hopper. The waste heat recovery module is used to recover heat from the coolant used for injection molding and preheat the plastic particles in the feed hopper.

[0010] In a preferred embodiment, the bottom of the support plate is fixedly connected to the upper side of the enclosed box. Cooling grooves are provided on both the moving and fixed molds, and plugs are fixedly connected to each cooling groove. Each plug has an interface, and circulation pipe one and circulation pipe two are respectively inserted into the two interfaces on the same plug. The ends of circulation pipe one and circulation pipe two furthest from the plugs are connected to the enclosed box. Two symmetrical circulation pumps are fixedly connected to the outside of the enclosed box. The output ends of the two circulation pumps are respectively connected to the two circulation pipes two via conduits. Three equidistant narrow openings are provided at the bottom of the enclosed box, and the inner walls of each narrow opening are fixedly connected to the outside of a heat-conducting plate. An insulation sleeve is adhered to the outside of the oil storage tank. Both the oil storage tank and the insulation sleeve have... The device has two circular holes, each with a fixed oil guide pipe. A second circulation pump is fixedly connected to the outside of the insulation jacket. The output end of the second circulation pump is connected to one of the oil guide pipes via a thin tube. The ends of the two oil guide pipes furthest from the oil tank are fixedly connected to the two ends of a spiral tube, respectively. Circular grooves are formed on the oil tank and the insulation jacket. A transmission rod is slidably connected to the inner wall of the groove. The transmission rod is located below the heat-conducting plate. A first motor is fixedly connected to the outside of the insulation jacket. The output end of the first motor is connected to the side of the transmission rod furthest from the insulation jacket via a coupling. Two symmetrical mounting plates are fixedly connected to the outside of the transmission rod. Two symmetrical stirring paddles are fixedly connected to the opposite side of the two mounting plates. A temperature regulation module is located at the bottom of the insulation jacket.

[0011] In a preferred embodiment, the temperature regulating module includes a lifting plate, the upper side of which is fixedly connected to the bottom of the oil reservoir. Four symmetrical guide rails are slidably connected to the outside of the lifting plate, and a support frame is provided on the outside of the lifting plate. The upper side of the support frame is fixedly connected to the bottom of the support plate. Two symmetrical stabilizing seats are fixedly connected to the bottom inner wall of the support frame. A single bidirectional lead screw is slidably connected to the two stabilizing seats. A second motor is fixedly connected to the outside of one of the stabilizing seats, and the output end of the second motor is connected to one side of the bidirectional lead screw via a coupling. The double-acting screw has two symmetrical fixed platforms on its exterior. The bottom of the fixed platforms is fixedly connected to the inner wall of the bottom of the support frame, and a lever arm 1 is slidably connected to the exterior of both fixed platforms. A lever arm 2 is slidably connected to the end of each lever arm 1 away from the fixed platform. The end of each lever arm 2 away from the lever arm 1 is slidably connected to the bottom of the lifting plate. The double-acting screw has two symmetrical movable seats rotatably connected to its exterior via external threads. A push-pull rod is slidably connected to the upper side of each movable seat, and the end of each push-pull rod away from the movable seat is slidably connected to the exterior of the lever arm 1 on the same side.

[0012] A power distribution cabinet, obtained by a power distribution cabinet manufacturing device as described above, further includes a cabinet body, on which a plurality of symmetrical heat dissipation slots are provided. A cabinet door is rotatably connected to the outside of the cabinet body via hinges, and an observation window is provided on the cabinet door. A handle is fixedly connected to the side of the cabinet door away from the cabinet body.

[0013] The beneficial effects that can be achieved by the above embodiments of the present invention include: 1. The device can effectively recover the waste heat from the coolant used for cooling and demolding in the moving mold and the fixed mold, and use it to preheat the plastic particles as raw materials, thereby reducing the overall heating requirements of the device, increasing the utilization rate of preheating, and improving the energy-saving effect of the device.

[0014] 2. It allows the device to quickly change the height of the oil storage tank, effectively controlling the position of the heat transfer plate inside the oil storage tank, thereby controlling the temperature of the heat transfer oil. This prevents the plastic particles in the feed hopper from melting prematurely and sticking to the feed hopper due to excessively high heat transfer oil temperature, ensuring the smooth feeding of the device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a power distribution cabinet manufacturing device proposed in this invention;

[0016] Figure 2 This is a cross-sectional view of a power distribution cabinet manufacturing device proposed in this invention;

[0017] Figure 3 This is a schematic diagram of the waste heat recovery module structure of a power distribution cabinet manufacturing device proposed in this invention;

[0018] Figure 4 This is a schematic diagram of the enclosed box structure of a power distribution cabinet manufacturing device proposed in this invention;

[0019] Figure 5 This is a schematic diagram of the oil storage tank structure of a power distribution cabinet manufacturing device proposed in this invention;

[0020] Figure 6 This is a schematic diagram of the temperature regulation module structure of a power distribution cabinet manufacturing device proposed in this invention;

[0021] Figure 7 This is a schematic diagram of a bidirectional lead screw structure for a power distribution cabinet manufacturing device proposed in this invention;

[0022] Figure 8 This is a schematic diagram of the overall structure of a power distribution cabinet proposed in this invention.

[0023] In the diagram: 1. Support plate; 2. Support frame; 3. Power unit; 4. Feed hopper; 5. Frame-shaped isolation door; 6. Waste heat recovery module; 601. Enclosed box; 602. Heat-conducting plate; 603. Oil storage tank; 604. Insulation jacket; 605. Oil guide pipe; 606. Spiral pipe; 607. Cooling tank; 608. Circulation pipe one; 609. Circulation pipe two; 610. Motor one; 611. Circulation pump one; 612. Circulation pump two; 613. Transmission rod; 614. Mounting plate; 615. 7. Agitator; 7. Temperature control module; 701. Lifting plate; 702. Guide rail; 703. Stabilizer; 704. Two-way lead screw; 705. Motor II; 706. Fixed platform; 707. Lever arm I; 708. Lever arm II; 709. Movable seat; 710. Push-pull rod; 8. Moving mold; 9. Fixed mold; 10. Hydraulic rod; 11. Injection pipe; 12. Heater; 13. Helical rod; 14. Cabinet; 15. Cabinet door; 16. Observation window; 17. Handle; 18. Heat dissipation groove. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] The present invention discloses a power distribution cabinet and its manufacturing apparatus, which are mainly applied to scenarios where existing power distribution cabinet manufacturing apparatuses cannot recover and utilize the waste heat generated by injection molding cooling.

[0026] Reference Figures 1-7 A power distribution cabinet manufacturing apparatus, comprising a base plate 1;

[0027] The frame-shaped isolation door 5 is equipped with four symmetrical hydraulic rods 10. The output end of the hydraulic rods 10 is connected to the same moving mold 8 by bolts. A fixed mold 9 is provided outside the moving mold 8. The moving mold 8 and the fixed mold 9 are in contact. An injection pipe 11 is provided on the side of the fixed mold 9 away from the moving mold 8, and a spiral rod 13 is provided inside the injection pipe 11.

[0028] Feed hopper 4 is connected to injection pipe 11. Three heaters 12 are equidistantly distributed on the outside of injection pipe 11.

[0029] Power unit 3, the output end of power unit 3 is connected to screw rod 13;

[0030] Waste heat recovery module 6 includes a closed box 601, on which three equally spaced heat-conducting plates 602 are arranged. An oil storage tank 603 is arranged outside the heat-conducting plates 602, and a spiral tube 606 is bolted to the inner wall of the feed hopper 4. The waste heat recovery module 6 is used to recover the heat in the injection molding coolant and preheat the plastic particles in the feed hopper 4.

[0031] Specifically, after the screw rod 13 melts the plastic granules flowing from the feed hopper 4 into the injection pipe 11 and conveys them into the fixed mold 9 through the heater 12, the molten plastic will form a plate in the moving mold 8 and the fixed mold 9. The waste heat recovery module 6 uses the heat contained in the coolant in the closed box 601 used to cool the moving mold 8 and the fixed mold 9 to transfer to the screw tube 606 on the feed hopper 4, thereby preheating the plastic granules in the feed hopper 4. When the temperature of the plastic granules in the feed hopper 4 is too high and is about to melt, the temperature regulation module 7 is used to regulate it, thereby lowering the temperature of the heat transfer oil in the screw tube 606.

[0032] Reference Figure 3 , Figure 4 and Figure 5 In a preferred embodiment, the bottom of the support plate 1 is bolted to the upper side of the enclosed box 601. Cooling grooves 607 are provided on both the moving mold 8 and the fixed mold 9. Each cooling groove 607 has a plug bolted to it. Each plug has an interface. Two circulation pipes 608 and 609 are respectively inserted into the two interfaces on the same plug, and the ends of circulation pipes 608 and 609 furthest from the plug are connected to the enclosed box 601. Two symmetrical circulation pumps 611 are bolted to the outside of the enclosed box 601. The output ends of the two circulation pumps 611 are respectively connected to the two circulation pipes 609 via conduits. The bottom of the enclosed box 601 has three equidistantly distributed narrow openings, the inner walls of which are bolted to the outside of the heat-conducting plate 602. An insulation sleeve 604 is bonded to the outside of the oil storage tank 603. Both the oil storage tank 603 and the insulation sleeve 604 have two round holes. The inner walls of the insulation jacket 604 are bolted with oil guide pipes 605. The outer walls of the insulation jacket 604 are bolted with a second circulation pump 612. The output end of the second circulation pump 612 is connected to one of the oil guide pipes 605 through a thin tube. The ends of the two oil guide pipes 605 away from the oil storage tank 603 are bolted to the two ends of the spiral tube 606. The oil storage tank 603 and the insulation jacket 604 are provided with circular grooves. The inner walls of the circular grooves are rotatably connected to a transmission rod 613 through bearings. The transmission rod 613 is located below the heat-conducting plate 602. The outer walls of the insulation jacket 604 are bolted with a first motor 610. The output end of the first motor 610 is connected to the side of the transmission rod 613 away from the insulation jacket 604 through a coupling. The outer walls of the transmission rod 613 are bolted with two symmetrical mounting plates 614. The opposite sides of the two mounting plates 614 are bolted with two symmetrical stirring paddles 615. A temperature regulating module 7 is provided below the insulation jacket 604.

[0033] Specifically, after the screw rod 13 injects molten plastic into the moving mold 8 and the fixed mold 9, the plastic forms the shape of a power distribution cabinet plate in the mold. The first circulation pump 611 is started, and the first circulation pump 611 circulates the coolant in the closed box 601 into the cooling tank 607, thereby cooling the plate. The temperature of the plastic plate enters the closed box 601 through the coolant and is then transferred to the heat transfer oil in the oil storage tank 603 by the heat transfer plate 602. The first motor 610 is started, and the first motor 610 drives the stirring paddle 615 to stir the heat transfer oil. The second circulation pump 612 is started, and the second circulation pump 612 transports the high-temperature heat transfer oil in the oil storage tank 603 into the screw tube 606 through the oil guide pipe 605, so that the screw tube 606 in the feed hopper 4 preheats the plastic solid particles in the feed hopper 4. After releasing the heat, the heat transfer oil flows back to the oil storage tank 603 through another oil guide pipe 605.

[0034] In specific application scenarios, the waste heat recovery module 6 is mainly applicable to the waste heat recovery stage in the waste heat recovery process. That is, the waste heat recovery module 6 enables the device to effectively recover the waste heat from the coolant used for cooling and demolding in the moving mold 8 and the fixed mold 9, and use it to preheat the plastic granules used as raw materials, thereby reducing the overall heating requirements of the device, increasing the utilization rate of preheating, and improving the energy-saving effect of the device.

[0035] Reference Figure 6 and Figure 7 In a preferred embodiment, the temperature regulating module 7 includes a lifting plate 701. The upper side of the lifting plate 701 is bolted to the bottom of the oil reservoir 603. Four symmetrical guide rails 702 are slidably connected to the outside of the lifting plate 701. A support frame 2 is provided on the outside of the lifting plate 701. The upper side of the support frame 2 is bolted to the bottom of the support plate 1. Two symmetrical stabilizing seats 703 are bolted to the inner wall of the bottom of the support frame 2. The same bidirectional lead screw 704 is rotatably connected to the two stabilizing seats 703 via bearings. A second motor 705 is bolted to the outside of one of the stabilizing seats 703. The output end of the second motor 705 is connected to one side of the bidirectional lead screw 704 via a coupling. The outside of the bidirectional lead screw 704 is provided with... Two symmetrical fixed platforms 706 are provided. The bottom of the fixed platforms 706 is connected to the bottom inner wall of the support frame 2 by bolts, and the outside of both fixed platforms 706 is rotatably connected to a lever arm 707 via bearings. The ends of the two lever arms 707 away from the fixed platforms 706 are rotatably connected to a lever arm 708 via bearings. The ends of the lever arms 708 away from the lever arms 707 are rotatably connected to the bottom of the lifting plate 701 via bearings. The outside of the bidirectional lead screw 704 is rotatably connected to two symmetrical movable seats 709 via external threads. The upper side of the two movable seats 709 is rotatably connected to a push-pull rod 710 via bearings, and the ends of the two push-pull rods 710 away from the movable seats 709 are rotatably connected to the outside of the lever arm 707 on the same side via bearings.

[0036] Specifically, when the temperature of the heat transfer oil flowing in the spiral tube 606 is too high and causes the plastic particles to melt silently, the second motor 705 is started. The second motor 705 drives the double-acting screw 704 to rotate, thereby causing the movable seat 709 to move towards the center of the double-acting screw 704. This causes the push-pull rod 710 to pull the first power arm 707 to rotate on the fixed platform 706, reducing the angle between the first power arm 707 and the double-acting screw 704. The first power arm 707 drives the second power arm 708 to rotate, further reducing the angle between the first power arm 707 and the second power arm 708. This causes the lifting plate 701 to gradually descend on the guide rail 702, reducing the depth to which the heat transfer plate 602 is inserted into the heat transfer oil in the oil tank 603, thereby reducing the heat obtained by the heat transfer oil from the heat transfer plate 602.

[0037] In specific application scenarios, the temperature regulation module 7 is mainly used for the temperature regulation link in the temperature regulation process. That is, the temperature regulation module 7 uses the bidirectional lead screw 704 and the movable seat 709 to enable the device to quickly change the height of the oil storage tank 603, effectively controlling the position of the heat transfer plate 602 in the oil storage tank 603, thereby realizing the control of the heat transfer oil temperature. This avoids the situation where the plastic particles in the feed hopper 4 melt prematurely and stick to the feed hopper 4 due to the excessively high temperature of the heat transfer oil, thus ensuring the smoothness of the device's material supply.

[0038] Reference Figure 8 A power distribution cabinet, obtained by a power distribution cabinet manufacturing apparatus as described above, further includes a cabinet body 14, on which a plurality of symmetrical heat dissipation slots 18 are provided. A cabinet door 15 is rotatably connected to the outside of the cabinet body 14 via hinges, and an observation window 16 is provided on the cabinet door 15. A handle 17 is bolted to the side of the cabinet door 15 away from the cabinet body 14.

[0039] Working principle: After the screw 13 injects molten plastic into the moving mold 8 and the fixed mold 9, the plastic forms the shape of a power distribution cabinet plate in the mold. The first circulation pump 611 is started, which circulates the coolant in the enclosed box 601 into the cooling tank 607, thereby cooling the plate. The temperature of the plastic plate enters the enclosed box 601 through the coolant and is then transferred to the heat transfer oil in the oil storage tank 603 by the heat transfer plate 602. The first motor 610 is started, which drives the stirring paddle 615 to stir the heat transfer oil. The second circulation pump 612 is started, which transports the high-temperature heat transfer oil in the oil storage tank 603 into the spiral tube 606 through the oil guide pipe 605. This allows the spiral tube 606, located in the feed hopper 4, to preheat the plastic solid particles in the feed hopper 4, releasing the heat. The heat transfer oil flows back to the oil storage tank 603 through another oil pipe 605. When the temperature of the heat transfer oil flowing in the spiral tube 606 is too high and the plastic particles melt, the second motor 705 is started. The second motor 705 drives the double-acting screw 704 to rotate, thereby moving the movable seat 709 towards the center of the double-acting screw 704. This causes the push-pull rod 710 to pull the first power arm 707 to rotate on the fixed platform 706, reducing the angle between the first power arm 707 and the double-acting screw 704. The first power arm 707 drives the second power arm 708 to rotate, further reducing the angle between the first power arm 707 and the second power arm 708. This causes the lifting plate 701 to gradually descend on the guide rail 702, reducing the depth to which the heat transfer plate 602 is inserted into the heat transfer oil in the oil storage tank 603, thereby reducing the heat obtained by the heat transfer oil from the heat transfer plate 602.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for manufacturing a power distribution cabinet, characterized in that, Including the foundation plate (1); A frame-shaped isolation door (5) is provided with four symmetrical hydraulic rods (10). The output end of the hydraulic rods (10) is fixedly connected to the same moving mold (8). A fixed mold (9) is provided outside the moving mold (8). The moving mold (8) and the fixed mold (9) are in contact. An injection pipe (11) is provided on the side of the fixed mold (9) away from the moving mold (8), and a spiral rod (13) is provided inside the injection pipe (11). Feed hopper (4), which is connected to injection pipe (11), and three equally spaced heaters (12) are provided on the outside of injection pipe (11). The power unit (3) is connected to the screw rod (13) at its output end. Waste heat recovery module (6), the waste heat recovery module (6) includes a closed box (601), three equally spaced heat conduction plates (602) are provided on the closed box (601), an oil storage tank (603) is provided outside the heat conduction plates (602), and a spiral tube (606) is fixedly connected to the inner wall of the feed hopper (4). The waste heat recovery module (6) is used to recover the heat in the injection molding coolant and preheat the plastic particles in the feed hopper (4); The bottom of the support plate (1) is fixedly connected to the upper side of the enclosed box (601). Cooling grooves (607) are provided on both the moving mold (8) and the fixed mold (9). A plug is fixedly connected in the cooling groove (607). An interface is provided on the plug. Circulation pipe one (608) and circulation pipe two (609) are respectively inserted into the outside of the two interfaces on the same plug. The ends of circulation pipe one (608) and circulation pipe two (609) away from the plug are connected to the enclosed box (601). The bottom of the enclosed box (601) has three equally spaced narrow openings, and the inner walls of the narrow openings are all fixedly connected to the outside of the heat-conducting plate (602). The oil storage tank (603) is bonded with an insulation sleeve (604), and a temperature adjustment module (7) is provided below the insulation sleeve (604). The temperature adjustment module (7) includes a lifting plate (701). The upper side of the lifting plate (701) is fixedly connected to the bottom of the oil storage tank (603). Four symmetrical guide rails (702) are slidably connected to the outside of the lifting plate (701). A support frame (2) is provided on the outside of the lifting plate (701). The upper side of the support frame (2) is fixedly connected to the bottom of the support plate (1). The bottom inner wall of the support frame (2) is fixedly connected to two symmetrical stabilizing seats (703). The same bidirectional lead screw (704) is slidably connected to the two stabilizing seats (703). A motor (705) is fixedly connected to the outside of one of the stabilizing seats (703). The output end of the motor (705) is connected to one side of the bidirectional lead screw (704) through a coupling. The bidirectional lead screw (704) has two symmetrical fixed platforms (706) on its outside. The bottom of the fixed platform (706) is fixedly connected to the bottom inner wall of the support frame (2), and the two fixed platforms (706) are slidably connected to the outside of the lever arm (707). Both of the first lever arms (707) are slidably connected to the second lever arm (708) at the ends away from the fixed platform (706). The ends of the second lever arm (708) away from the first lever arm (707) are slidably connected to the bottom of the lifting plate (701). The external of the double-acting screw (704) is rotatably connected to two symmetrical movable seats (709) through external threads. The upper side of the two movable seats (709) is slidably connected to push-pull rods (710), and the ends of the two push-pull rods (710) away from the movable seats (709) are slidably connected to the external of the first lever arm (707) on the same side.

2. The distribution cabinet manufacturing device according to claim 1, characterized in that, The sealed box (601) is externally fixedly connected to two symmetrical circulation pumps (611), and the output ends of the two circulation pumps (611) are respectively connected to two circulation pipes (609) through conduits.

3. The distribution cabinet manufacturing device according to claim 1, characterized in that... Two round holes are opened on the oil storage tank (603) and the insulation sleeve (604), and oil guide pipes (605) are fixedly connected in the two round holes. A second circulation pump (612) is fixedly connected to the outside of the insulation sleeve (604). The output end of the second circulation pump (612) is connected to one of the oil guide pipes (605) through a thin tube, and the ends of the two oil guide pipes (605) away from the oil storage tank (603) are fixedly connected to the two ends of the spiral tube (606).

4. The distribution cabinet manufacturing device according to claim 1, characterized in that, The oil storage tank (603) and the insulation sleeve (604) are provided with circular grooves. A transmission rod (613) is slidably connected to the inner wall of the circular groove. The transmission rod (613) is located below the heat-conducting plate (602). A motor (610) is fixedly connected to the outside of the insulation sleeve (604). The output end of the motor (610) is connected to the side of the transmission rod (613) away from the insulation sleeve (604) through a coupling. Two symmetrical mounting plates (614) are fixedly connected to the outside of the transmission rod (613). Two symmetrical stirring paddles (615) are fixedly connected to the opposite side of the two mounting plates (614).

5. A power distribution cabinet, obtained by a power distribution cabinet manufacturing apparatus as described in any one of claims 1-4, comprising a cabinet body (14), characterized in that, The cabinet (14) has multiple symmetrical heat dissipation slots (18). The cabinet (14) is connected to a cabinet door (15) by a hinge. The cabinet door (15) has an observation window (16). A handle (17) is fixedly connected to the side of the cabinet door (15) away from the cabinet (14).

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