Mobile anti-seepage outdoor high-voltage switch cabinet
By using interlaced exhaust and air inlet mechanisms, hidden universal wheels and height adjustment mechanisms in the high-voltage switch cabinet, the problems of water seepage, poor heat dissipation and insufficient mobility in the outdoors are solved, and effective heat dissipation and Convenient movement, extending service life.
Patent Information
- Application Number
- CN202310673850.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-08
- Publication Date
- 2024-12-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing high-voltage switch cabinets are prone to water seepage outdoors, resulting in short circuits and fires, poor heat dissipation, easy to be affected by dust and impurities, and lack movement functions, which affects service life and convenient handling.
A mobile anti-seepage outdoor high-voltage switch cabinet is designed, using staggered exhaust and air inlet mechanisms, hidden universal wheels and height adjustment mechanisms to ensure heat dissipation effect, prevent dust from entering, and to have a moving function.
It effectively prevents short circuits and fires caused by water seepage, improves heat dissipation effect, avoids the influence of dust, ensures the stability and convenient movement of the device, and extends the service life.
Smart Images
Figure CN119108916A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of high-voltage switch cabinets, and in particular to a mobile anti-seepage outdoor high-voltage switch cabinet. Background Art
[0002] High-voltage switchgear refers to the switchgear used for power generation, transmission, distribution, power conversion and consumption in the power system. It plays the role of switching, control or protection. High-voltage switchgear is divided into several categories according to the voltage level of 3.6kV ~ 550kV electrical products, high-voltage disconnectors and grounding switches, high-voltage load switches, high-voltage automatic reclosing and sectionalizers, high-voltage operating mechanisms, high-voltage explosion-proof distribution devices and high-voltage switchgear.
[0003] High-voltage switchgear is usually used outdoors to facilitate power generation, transmission, distribution, and power conversion in power systems. However, existing high-voltage switchgear still has some shortcomings. For example, existing high-voltage switchgear is prone to water seepage outdoors, causing short circuits in electrical components inside the high-voltage switchgear, which in turn causes fires and property losses. At the same time, the heat dissipation of existing high-voltage switchgear is poor, and most high-voltage switchgear uses heat dissipation holes for heat dissipation, which easily leads to the entry of dust and impurities in rainy or windy weather, affecting the service life of the high-voltage switchgear. At the same time, the high-voltage switchgear does not have a mobile function and is difficult to carry.
[0004] For this purpose, a mobile anti-seepage outdoor high-voltage switch cabinet is proposed. Summary of the invention
[0005] The purpose of the present invention is to solve the problem that the existing high-voltage switch cabinet is prone to water seepage outdoors, which causes short circuits in electrical components inside the high-voltage switch cabinet, thereby causing fires and causing property losses. At the same time, the existing high-voltage switch cabinet has poor heat dissipation, and most high-voltage switch cabinets use heat dissipation holes for heat dissipation, which easily lead to the entry of dust and impurities in rainy or windy weather, affecting the service life of the high-voltage switch cabinet. At the same time, the high-voltage switch cabinet does not have a mobile function and is difficult to carry. The present invention provides a mobile anti-seepage outdoor high-voltage switch cabinet.
[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:
[0007] A mobile anti-seepage outdoor high-voltage switch cabinet comprises a base, a mounting plate is welded and installed on the top of the base, the number of the mounting plates is two groups and they are arranged in parallel and correspondingly, an outer cabinet is placed on the top of the base at the interval between the two groups of mounting plates, a height adjustment mechanism is arranged at the connection between the outer cabinet and the mounting plate, an electric push rod is welded and installed on the inner top of the base, the number of the electric push rods is two groups and they are arranged in parallel and correspondingly, a movable plate is welded and installed on the telescopic end of the electric push rod, a universal wheel is arranged at the bottom of the movable plate, the number of the universal wheels is four groups and they are arranged in equal intervals, a cabinet door is hingedly installed on the front side wall of the outer cabinet, an observation window is arranged on the front side wall of the cabinet door, a handle is welded and installed on the front side wall of the cabinet door, and a height adjustment mechanism is arranged at the connection between the outer cabinet and the mounting plate, an electric push rod is welded and installed on the inner top of the base, the number of the electric push rods is two groups and they are arranged in parallel and correspondingly, a movable plate is welded and installed on the telescopic end of the electric push rod, a universal wheel is arranged at the bottom of the movable plate, and a universal wheel is arranged in four groups and they are arranged in equal intervals, a cabinet door is hingedly installed on the front side wall of the outer cabinet, an observation window is arranged on the front side wall of the cabinet door, a handle is welded and installed on the front side wall of the cabinet door, and a height adjustment mechanism is arranged at the bottom of the cabinet door There is an air inlet mechanism, and the rear side wall of the outer cabinet is located at the top of the outer cabinet and an exhaust mechanism is arranged. The structure of the exhaust mechanism is the same as that of the air inlet mechanism. The outer cabinet has an inner cabinet built in it, and the inner cabinet is a hollow structure. When the device starts to be used, the electric push rod is driven first to cause the movable plate to drive the universal wheel to move longitudinally, so that the universal wheel lifts the base. At this time, the user pushes the outer cabinet to move the device to a limited position. At this time, when the device is put into use, the electric push rod is reset to cause the universal wheel to shrink into the base. When the switch cabinet is put into use, the exhaust mechanism and the air inlet mechanism are driven to dissipate heat inside the switch cabinet. When water accumulates near the switch cabinet body, the user can drive the height adjustment mechanism to cause the switch cabinet body to rise longitudinally.
[0008] Furthermore, the height adjustment mechanism includes a first slide groove, a first slider, a second slider, a threaded rod, a second slide groove, a first gear, a second gear, a fixed block, a connecting rod and a dual-axis motor. A second slide groove is opened in the middle of the corresponding side wall of the mounting plate, and a threaded rod is rotatably installed on the inner top and bottom of the second slide groove. The threaded rod longitudinally penetrates the second slide groove and extends to the inner side of the base. The threaded rod is located at one end of the inner side of the base and is welded and installed with the second gear. The dual-axis motor is welded and installed on the inner top of the base. A connecting rod is welded and installed on the output end of the dual-axis motor. The first gear is meshed with the second gear. The second slide groove has a second slider built in it, and the second slider is sleeved on the threaded rod and threadedly connected to the threaded rod. The corresponding side walls of the second slider are welded and connected to the inner walls on both sides of the outer cabinet. When the device needs to lift the switch cabinet body, the dual-axis motor is driven to drive the first gear to rotate, causing the second gear and the threaded rod to rotate. At this time, the second slider drives the switch cabinet body to move longitudinally to adjust the placement height of the switch cabinet body.
[0009] Furthermore, a fixing block is welded and installed on the inner top of the base. There are two groups of fixing blocks, which are located on both sides of the dual-axis motor in sequence. The fixing blocks are sleeved on the connecting rod and slidably connected to the connecting rod. The use of the fixing blocks can effectively limit the position of the connecting rod to prevent the first gear and the second gear from falling off.
[0010] Furthermore, a first slide groove is provided on the corresponding side wall of the mounting plate at the front and rear sides of the second slide groove, and a first slide groove has a built-in first slide block. The corresponding side wall of the first slide block is welded and connected to the outer wall of the outer cabinet body. The use of the first slide groove and the first slide block can effectively ensure the stability of the switch cabinet body during the lifting process.
[0011] Furthermore, the air intake mechanism includes an exhaust fan, an activated carbon filter plate, an air inlet and an isolation cover. The exhaust fan is embedded in the cabinet door, and the isolation cover is welded to the front side wall of the cabinet door on the outer side wall of the exhaust fan. The air inlet is opened at the bottom of the isolation cover, and the inner side wall of the air inlet is provided with an activated carbon filter plate. When the air intake mechanism is driven, the exhaust fan draws in external air. When the external air passes through the activated carbon filter plate, the activated carbon filter plate intercepts moisture and dust. At this time, due to the principle that hot air is in a rising state, the exhaust mechanism will extract the hot air accumulated on the top inner side of the switch cabinet, thereby achieving the heat dissipation of the switch cabinet.
[0012] Furthermore, a buffer mechanism is provided at the connection between the inner cabinet and the outer cabinet, and the buffer mechanism includes a connecting block, a mounting block, a sliding rod and a reset spring. The connecting blocks are welded and installed on the inner top and bottom of the outer cabinet. The number of the connecting blocks is two groups and they are arranged in parallel. The corresponding side walls of the connecting blocks are welded and installed with sliding rods. The number of the sliding rods is two groups. The mounting block is sleeved and installed on the sliding rod, and the outer side wall of the mounting block is welded and connected to the inner cabinet. The mounting block is located in the middle of the sliding rod, and the two side walls of the sliding rod located on the mounting block are sleeved and installed with reset springs. The free end of the reset spring is welded and connected to the mounting block and the connecting block. When the device is shaken, the reset springs on both sides of the mounting block can effectively dissipate the impact force, thereby stabilizing the inner cabinet.
[0013] The beneficial effects of the present invention are as follows:
[0014] 1. The present invention arranges staggered exhaust mechanisms and air inlet mechanisms, so that the device can effectively discharge the heat inside the switch cabinet, thereby ensuring the heat dissipation effect of the high-voltage switch cabinet. At the same time, the device arranges the air inlet and the air outlet of the exhaust mechanism and the air inlet mechanism as a downward structure, which effectively avoids the situation in which dust and impurities are easily introduced in rainy or windy weather, affecting the service life of the high-voltage switch cabinet, and ensures the normal use of the switch cabinet to a certain extent.
[0015] 2. The present invention provides hidden universal wheels, so that the device has the function of mobility while ensuring the stability of the device after placement, which improves the convenience of use to a certain extent. At the same time, the addition of universal wheels also provides convenience for the movement and transportation of the switch cabinet. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;
[0017] Figure 2 is a structural schematic diagram of the height adjustment mechanism of the present invention;
[0018] Figure 3 It is a structural schematic diagram of the air inlet mechanism of the present invention;
[0019] Figure 4 It is a structural schematic diagram of the buffer mechanism of the present invention;
[0020] Figure numerals: 1. observation window; 2. cabinet door; 3. air inlet mechanism; 4. base; 5. mounting plate; 6. handle; 7. outer cabinet; 8. first slide groove; 9. first slider; 10. dual-axis motor; 11. electric push rod; 12. movable plate; 13. universal wheel; 14. connecting rod; 15. fixed block; 16. first gear; 17. second gear; 18. second slider; 19. threaded rod; 20. second slide groove; 21. exhaust fan; 22. activated carbon filter plate; 23. air inlet; 24. isolation cover; 25. reset spring; 26. mounting block; 27. slide rod; 28. connecting block; 29. inner cabinet. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0023] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0024] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0025] like Figures 1 to 4 As shown, a mobile anti-seepage outdoor high-voltage switch cabinet includes a base 4, a mounting plate 5 is welded and installed on the top of the base 4, the number of the mounting plates 5 is two groups and they are arranged in parallel, an outer cabinet 7 is placed on the top of the base 4 at the interval between the two groups of mounting plates 5, a height adjustment mechanism is arranged at the connection between the outer cabinet 7 and the mounting plate 5, an electric push rod 11 is welded and installed on the inner top of the base 4, the number of the electric push rod 11 is two groups and they are arranged in parallel, a movable plate 12 is welded and installed on the telescopic end of the electric push rod 11, a universal wheel 13 is arranged at the bottom of the movable plate 12, the number of the universal wheel 13 is four groups and they are arranged equidistantly, a cabinet door 2 is hingedly installed on the front side wall of the outer cabinet 7, the front side wall of the cabinet door 2 is provided with an observation window 1, a handle 6 is welded and installed on the front side wall of the cabinet door 2, and the front side wall of the cabinet door 2 is located at the cabinet door 2 An air inlet mechanism 3 is provided at the bottom, and an exhaust mechanism is provided at the top of the outer cabinet 7 on the rear side wall of the outer cabinet 7. The exhaust mechanism has the same structure as the air inlet mechanism 3. The outer cabinet 7 has an internal cabinet 29, and the internal cabinet 29 is a hollow structure. When the device starts to be used, the electric push rod 11 is driven first to cause the movable plate 12 to drive the universal wheel 13 to move longitudinally, so that the universal wheel 13 lifts the base 4. At this time, the user pushes the outer cabinet 7 to move the device to a limited position. At this time, when the device is put into use, the electric push rod 11 is reset to cause the universal wheel 13 to shrink into the base 4. When the switch cabinet is put into use, the exhaust mechanism and the air inlet mechanism 3 are driven to dissipate heat inside the switch cabinet. When water accumulates near the switch cabinet body, the user can drive the height adjustment mechanism to cause the switch cabinet body to rise longitudinally.
[0026] The height adjustment mechanism includes a first slide groove 8, a first slider 9, a second slider 18, a threaded rod 19, a second slide groove 20, a first gear 16, a second gear 17, a fixed block 15, a connecting rod 14 and a dual-axis motor 10. A second slide groove 20 is provided in the middle of the corresponding side wall of the mounting plate 5. The threaded rod 19 is rotatably installed at the top and bottom of the inner side of the second slide groove 20. The threaded rod 19 longitudinally penetrates the second slide groove 20 and extends to the inner side of the base 4. The threaded rod 19 is located at one end of the inner side of the base 4 and is welded with the second gear 17. The dual-axis motor 10 is welded on the inner top of the base 4. The output end of the dual-axis motor 10 is welded and installed. A connecting rod 14 is installed, and a first gear 16 is welded and installed on the free end of the connecting rod 14. The first gear 16 is meshed with the second gear 17. The second slide groove 20 has a built-in second slider 18. The second slider 18 is sleeved on the threaded rod 19 and is threadedly connected with the threaded rod 19. The corresponding side walls of the second slider 18 are welded and connected to the inner walls on both sides of the outer cabinet 7. When the device needs to lift the switch cabinet body, the dual-axis motor 10 is driven to drive the first gear 16 to rotate, causing the second gear 17 and the threaded rod 19 to rotate. At this time, the second slider 18 drives the switch cabinet body to move longitudinally to adjust the placement height of the switch cabinet body.
[0027] A fixing block 15 is welded and installed on the inner top of the base 4. There are two groups of fixing blocks 15, which are located on both sides of the dual-axis motor 10 in sequence. The fixing blocks 15 are sleeved on the connecting rod 14 and are slidably connected to the connecting rod 14. The use of the fixing blocks 15 can effectively limit the position of the connecting rod 14 to prevent the first gear 16 and the second gear 17 from falling off.
[0028] The corresponding side wall of the mounting plate 5 is located at the front and rear sides of the second slide groove 20 and is provided with a first slide groove 8, the first slide groove 8 has a built-in first slider 9, and the corresponding side wall of the first slider 9 is welded and connected to the outer wall of the outer cabinet body 7. The use of the first slide groove 8 and the first slider 9 can effectively ensure the stability of the switch cabinet body during the lifting process.
[0029] The air intake mechanism 3 includes an exhaust fan 21, an activated carbon filter plate 22, an air inlet 23 and an isolation cover 24. The exhaust fan 21 is embedded in the cabinet door 2, and the front side wall of the cabinet door 2 is located on the outer side wall of the exhaust fan 21 and is welded with an isolation cover 24. The bottom of the isolation cover 24 is provided with an air inlet 23, and the inner side wall of the air inlet 23 is provided with an activated carbon filter plate 22. When the air intake mechanism 3 is driven, the exhaust fan 21 draws in external air. When the external air passes through the activated carbon filter plate 22, the activated carbon filter plate 22 retains moisture and dust. At this time, due to the principle that hot air is in an ascending state, the exhaust mechanism draws out the hot air accumulated on the top of the inner side of the switch cabinet, thereby achieving the heat dissipation of the switch cabinet.
[0030] A buffer mechanism is provided at the connection between the inner cabinet 29 and the outer cabinet 7, and the buffer mechanism includes a connecting block 28, a mounting block 26, a slide bar 27 and a reset spring 25. The connecting blocks 28 are welded and installed on the inner top and bottom of the outer cabinet 7. The number of the connecting blocks 28 is two groups and they are arranged in parallel. The corresponding side walls of the connecting blocks 28 are welded and installed with slide bars 27. The number of the slide bars 27 is two groups. The mounting block 26 is sleeved and installed on the slide bar 27. The outer side wall of the mounting block 26 is welded and connected to the inner cabinet 29. The mounting block 26 is located in the middle of the slide bar 27. The two side walls of the slide bar 27 located on the mounting block 26 are sleeved and installed with reset springs 25. The free end of the reset spring 25 is welded and connected to the mounting block 26 and the connecting block 28. When the device is shaken, the reset springs 25 on both sides of the mounting block 26 can effectively dissipate the impact force, thereby stabilizing the inner cabinet 29.
[0031] In summary: when the device starts to be used, it is preferred to drive the electric push rod 11 to cause the movable plate 12 to drive the universal wheel 13 to move longitudinally, so that the universal wheel 13 lifts the base 4. At this time, the user pushes the outer cabinet 7 to move the device to a limited position. At this time, when the device is put into use, the electric push rod 11 is reset to cause the universal wheel 13 to shrink into the base 4. When the switch cabinet is put into use, the exhaust mechanism and the air inlet mechanism 3 are driven to dissipate heat inside the switch cabinet. When water accumulates near the switch cabinet body, the user can drive the height adjustment mechanism to cause the switch cabinet body to rise longitudinally. When the device needs to lift the switch cabinet body, the dual-axis motor 10 is driven to The first gear 16 rotates, causing the second gear 17 and the threaded rod 19 to rotate. At this time, the second slider 18 drives the switch cabinet body to move longitudinally to adjust the placement height of the switch cabinet body. When the air inlet mechanism 3 is driven, the exhaust fan 21 draws in external air. When the external air passes through the activated carbon filter plate 22, the activated carbon filter plate 22 retains moisture and dust. At this time, due to the principle that hot air is in an upward state, the exhaust mechanism draws out the hot air accumulated on the top of the inner side of the switch cabinet, thereby achieving the heat dissipation of the switch cabinet. When the device is shaken, the return springs 25 on both sides of the mounting block 26 can effectively dissipate the impact force, thereby stabilizing the inner cabinet body 29.
[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.
Claims
1. A mobile anti-seepage outdoor high-voltage switchgear, characterized in that: The invention comprises a base (4), a mounting plate (5) is welded and installed on the top of the base (4), the number of the mounting plates (5) is two groups and they are arranged in parallel and correspondingly, an outer cabinet (7) is placed on the top of the base (4) at the interval between the two groups of mounting plates (5), a height adjustment mechanism is arranged at the connection between the outer cabinet (7) and the mounting plate (5), an electric push rod (11) is welded and installed on the top of the inner side of the base (4), the number of the electric push rod (11) is two groups and they are arranged in parallel and correspondingly, a movable plate (12) is welded and installed on the telescopic end of the electric push rod (11), and a movable plate (12) is arranged at the bottom of the movable plate (12). The cabinet door (2) is hingedly mounted on the front side wall of the outer cabinet body (7), the front side wall of the cabinet door (2) is provided with an observation window (1), the front side wall of the cabinet door (2) is welded with a handle (6), the front side wall of the cabinet door (2) is provided with an air inlet mechanism (3) at the bottom of the cabinet door (2), the rear side wall of the outer cabinet body (7) is provided with an exhaust mechanism at the top of the outer cabinet body (7), the exhaust mechanism has the same structure as the air inlet mechanism (3), the outer cabinet body (7) is internally mounted with an inner cabinet body (29), and the inner cabinet body (29) is a hollow structure.
2. A mobile anti-seepage outdoor high-voltage switch cabinet according to claim 1, characterized in that: The height adjustment mechanism comprises a first slide groove (8), a first slider (9), a second slider (18), a threaded rod (19), a second slide groove (20), a first gear (16), a second gear (17), a fixing block (15), a connecting rod (14) and a dual-axis motor (10). A second slide groove (20) is provided at the center of the corresponding side wall of the mounting plate (5). The threaded rod (19) is rotatably installed at the top and bottom of the inner side of the second slide groove (20). The threaded rod (19) longitudinally penetrates the second slide groove (20) and extends to the inner side of the base (4). The threaded rod (19) is located inside the base (4). A second gear (17) is welded and installed at one end of the side, a double-axis motor (10) is welded and installed at the inner top of the base (4), a connecting rod (14) is welded and installed at the output end of the double-axis motor (10), a first gear (16) is welded and installed at the free end of the connecting rod (14), the first gear (16) and the second gear (17) are meshed, a second slide block (18) is built in the second slide groove (20), the second slide block (18) is sleeved on the threaded rod (19) and is threadedly connected with the threaded rod (19), and the corresponding side walls of the second slide block (18) are welded and connected to the inner walls on both sides of the outer cabinet (7).
3. A mobile anti-seepage outdoor high-voltage switch cabinet according to claim 2, characterized in that: A fixing block (15) is welded and installed on the inner top of the base (4). The fixing blocks (15) are in two groups and are sequentially located on both sides of the dual-axis motor (10). The fixing blocks (15) are sleeved on the connecting rod (14) and are slidably connected to the connecting rod (14).
4. A mobile anti-seepage outdoor high-voltage switch cabinet according to claim 2, characterized in that: The corresponding side wall of the mounting plate (5) is provided with a first slide groove (8) at the front and rear sides of the second slide groove (20), the first slide groove (8) has a first slider (9) built in, and the corresponding side wall of the first slider (9) is welded and connected to the outer side wall of the outer cabinet (7).
5. The mobile anti-seepage outdoor high-voltage switch cabinet according to claim 1 is characterized in that: The air intake mechanism (3) comprises an exhaust fan (21), an activated carbon filter plate (22), an air inlet (23) and an isolation cover (24); the exhaust fan (21) is mounted on the cabinet door (2); the front side wall of the cabinet door (2) is welded to the outer side wall of the exhaust fan (21) and an isolation cover (24) is mounted; the bottom of the isolation cover (24) is provided with an air inlet (23); the inner side wall of the air inlet (23) is provided with an activated carbon filter plate (22).
6. The mobile anti-seepage outdoor high-voltage switch cabinet according to claim 1, characterized in that: A buffer mechanism is provided at the connection between the inner cabinet (29) and the outer cabinet (7), and the buffer mechanism comprises a connecting block (28), a mounting block (26), a slide bar (27) and a reset spring (25). The connecting block (28) is welded and installed on the inner top and bottom of the outer cabinet (7). The number of the connecting blocks (28) is two groups and they are arranged in parallel and correspondingly. The corresponding side walls of the connecting block (28) are welded and installed with slide bars (27). The number of the slide bars (27) is two groups. The mounting block (26) is sleeved and installed on the slide bar (27). The outer side wall of the mounting block (26) is welded and connected to the inner cabinet (29). The mounting block (26) is located in the middle of the slide bar (27). The two side walls of the slide bar (27) located on the mounting block (26) are sleeved and installed with reset springs (25). The free end of the reset spring (25) is welded and connected to the mounting block (26) and the connecting block (28).