Construction machine low-voltage electrical control box

Abstract

The utility model discloses an engineering machinery low pressure electrical control box, including box frame, sealed waterproof subassembly, left door subassembly and right door subassembly, the one side of box frame is equipped with the installation opening, the middle part of the installation opening of box frame is fixed with crossbeam, and the installation opening is divided into the left door and right door corresponding with left door subassembly and right door subassembly with left door and right door, left door subassembly and right door subassembly are rotatably connected with box frame through the hinge, and the rim outer circumferential side of left door and right door forms the frame, and the outer edge of frame forms the flanging, sealed waterproof subassembly includes inside waterproof strip and outside waterproof strip, and the flanging is inlayed in the "U" shape recess of inside waterproof strip, and outside waterproof strip is fixed on the outside wall of inside waterproof strip. The utility model can adapt to the harsh complex working condition, and the protection performance is excellent, and can realize efficient dust prevention, effectively resist liquid intrusion.

Description

Technical Field

[0001] This utility model relates to the field of electrical control box technology, and in particular to a low-voltage electrical control box for engineering machinery. Background Technology

[0002] In the field of construction machinery, electrical control boxes, as the core load-bearing and protection devices for electrical components, directly determine the operational stability, reliability, and safety of construction machinery. They are key components ensuring the continuous and efficient operation of equipment. With the continuous expansion of construction scenarios, the operating environment of construction machinery is becoming increasingly complex. Outdoor open-air operations, construction in humid and rainy areas, dusty conditions, and frequent equipment washing are becoming more common, placing more stringent demands on the protection capabilities of low-voltage electrical control boxes.

[0003] However, current traditional low-voltage electrical control boxes for engineering machinery have some shortcomings in their protection design. Their protection levels are mostly concentrated between IP54 and IP65, making them unsuitable for complex operating conditions. Regarding dust protection, traditional control boxes generally rely on simple filters or gap seals. These designs can only block large particles and cannot effectively prevent the long-term penetration of fine dust, which may lead to decreased heat dissipation efficiency of components and easily cause short circuits. In terms of waterproofing, traditional products often use a single rubber sealing ring for static sealing. This sealing method requires high installation precision, and the rubber material is prone to aging, hardening, cracking, and deformation under long-term temperature changes and mechanical vibration, leading to seal failure. Once liquid enters the control box, it can cause reduced circuit insulation performance, corrosion of metal parts, and other malfunctions, increasing equipment maintenance costs. Especially in scenarios such as high-frequency flushing, outdoor installation, or accidental immersion, the failure rate of traditional low-voltage electrical control boxes is significantly increased due to insufficient protection levels, which may even lead to production line shutdowns or safety accidents, resulting in economic losses.

[0004] Therefore, in view of the shortcomings of traditional low-voltage electrical control boxes for construction machinery in terms of dust and water resistance, as well as the frequent failures under complex working conditions such as high-frequency washing, outdoor exposure, and accidental immersion, and the inability to meet the stability and reliability requirements of industrial automation, there is an urgent need to design a low-voltage electrical control box for construction machinery that can adapt to the above-mentioned harsh and complex working conditions, has excellent protective performance, and can achieve efficient dust prevention and effective resistance to liquid intrusion. Utility Model Content

[0005] To address the shortcomings of traditional low-voltage electrical control boxes for construction machinery, which typically have protection ratings of IP54 to IP65 and insufficient dust and water resistance, leading to frequent malfunctions under complex outdoor conditions such as dampness, rain, dust, and high-frequency washing, and failing to meet the stability and reliability requirements of industrial automation, this invention provides a structure for a low-voltage electrical control box for construction machinery. This structure is adaptable to harsh and complex working conditions, offers excellent protection, and provides efficient dust protection and effective resistance to liquid intrusion.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a low-voltage electrical control box structure for engineering machinery, including a box frame, a sealing and waterproof component, a left door component and a right door component;

[0007] The box frame is an integral structure, with an installation space inside and an installation opening on one side; a crossbeam is fixed in the middle of the installation opening of the box frame, dividing the installation opening into a left doorway and a right doorway corresponding to the left door assembly and the right door assembly.

[0008] The left and right door assemblies are rotatably connected to the box frame via hinges, and can close the corresponding left and right door openings.

[0009] A frame is formed on the outer periphery of the left and right doorways, and a flange is formed on the outer edge of the frame; the sealing and waterproofing component is installed on the flange of the left and right doorways.

[0010] The sealing and waterproofing assembly includes an inner waterproofing strip and an outer waterproofing strip. The cross-section of the inner waterproofing strip is U-shaped, and the flange is fitted and embedded in the U-shaped groove of the inner waterproofing strip. The outer waterproofing strip is fixed to the outer wall of the inner waterproofing strip, and the cross-section of the outer waterproofing strip is O-shaped.

[0011] When the left and right door assemblies are closed, the edges of the left and right door assemblies abut against and fit against the outer waterproof strip of the corresponding sealing and waterproofing assembly.

[0012] Furthermore, the inner waterproof strip uses a fluororubber sealing ring, and the outer waterproof strip uses a nitrile rubber strip.

[0013] Furthermore, the top walls of both the left and right door assemblies are bent to form water guide grooves, and the front side of the housing frame has an eaves corresponding to the top of the left and right door assemblies.

[0014] Furthermore, it also includes a door lock, which is installed on the right door assembly and the left door assembly to lock the right door assembly and the left door assembly to the box frame; there are multiple door locks, and the multiple door locks are arranged along the height direction of the right door assembly and the left door assembly; when the multiple door locks are locked simultaneously, the pressure on the contact surface of the right door assembly and the left door assembly and the box frame is uniform.

[0015] Furthermore, a bottom mounting plate is provided on the bottom surface inside the box frame, and the connection gap between the bottom mounting plate and the box frame is sealed with expanding foam; a wire hole is provided on the bottom mounting plate, and an IP67 waterproof plug is installed in the wire hole, and a silicone pad is provided on the contact surface between the waterproof plug and the bottom mounting plate.

[0016] Furthermore, each of the left and right door assemblies has three hinges that connect to the housing frame. The three hinges are spaced apart along the height direction of the right and left door assemblies, and the distance between the two hinges located above each other is smaller than the distance between the two hinges located below each other. The bushings of the hinges are equipped with rubber sealing rings.

[0017] Furthermore, a groove is provided at the connection between the hinge and the box frame, and the end of the hinge is placed in the groove; a protrusion is formed on the inner edge of the box frame corresponding to the hinge connection, and the periphery of the protrusion is sealed with expanding foam.

[0018] The beneficial effects of this utility model are:

[0019] 1. This utility model achieves an IP67 protection rating through a double-sealing design using an inner U-shaped fluororubber sealing ring and an outer O-shaped nitrile rubber strip, combined with a hinge bushing with a built-in rubber sealing ring, foam sealing of the bottom mounting plate gaps, IP67-rated waterproof inserts for the wiring holes, and pre-filled rubber plugs for the bolt holes. This rating provides complete dustproof protection, allowing immersion in 1 meter of water for 30 minutes without affecting internal electrical performance. It completely solves the problem of insufficient dust and water resistance in traditional control boxes, making it suitable for complex engineering machinery operations such as outdoor exposure, humid and rainy conditions, high dust levels, and high-frequency washing. The double-sealing structure effectively blocks the penetration of fine dust, preventing dust accumulation that could reduce component heat dissipation efficiency and cause short circuits. It also resists liquid intrusion, preventing reduced circuit insulation performance and corrosion of metal parts, thus reducing equipment failures caused by protection failures at their source.

[0020] 2. The housing frame of this utility model is integrally welded from stainless steel with a wall thickness of not less than 2mm and rounded corners. It has sufficient mechanical strength to withstand the vibration and impact of engineering machinery during operation, and avoids the failure of protection caused by splicing gaps. The three hinges connecting the left and right door components are spaced apart along the height direction, and the distance between the two upper hinges is smaller than that between the two lower hinges. This can effectively distribute the self-weight load of the door, prevent the door from deforming due to concentrated gravity during long-term use, ensure the fitting accuracy between the door and the housing frame, and maintain stable sealing performance. Insulating and shock-absorbing pads are set between the side mounting plates, component mounting plates and the housing frame. This can achieve electrical insulation, avoid safety hazards such as electric shock caused by the conductivity of metal parts, and absorb the vibration of engineering machinery during operation, reducing the impact of vibration on the sealing structure, thus balancing safety and sealing stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 2 This is a partial structural schematic diagram of the present invention.

[0023] Figure 3 This is a structural schematic diagram illustrating the sealing and waterproofing component in this utility model.

[0024] Figure 4 This is a structural schematic diagram illustrating the door panel guide component in this utility model.

[0025] In the diagram: 1. Cabinet frame; 11. Left doorway; 12. Right doorway; 13. Enclosure; 14. Flanged edge; 15. Eaves; 16. Left side mounting plate; 17. Component mounting plate; 18. Bottom mounting plate; 19. Crossbeam; 2. Left door assembly; 21. Water guide channel; 3. Right door assembly; 4. Inner waterproof strip; 5. Outer waterproof strip; 6. Lifting ring; 7. Cabinet door lock; 8. Hinge; 9. Door panel guide component; 91. Door panel guide channel bracket; 92. Inner upper bracket; 93. Limiting bracket. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] This utility model discloses a low-voltage electrical control box for engineering machinery.

[0028] Reference Figures 1 to 4 A low-voltage electrical control box for engineering machinery includes a box frame 1, a sealing and waterproof assembly, a left door assembly 2, and a right door assembly 3;

[0029] The box frame 1 is integrally welded from 304 stainless steel, and the wall thickness of the box frame 1 is not less than 2mm. The corners of the box frame 1 adopt a rounded transition structure. This ensures that the main body of the box has sufficient mechanical strength to resist the vibration and impact during the operation of engineering machinery, and avoids the failure of protection caused by splicing gaps. At the same time, the corners of the box frame 1 are processed into a rounded transition structure. This design can reduce the residual accumulation of rainwater and dust at the corners, reduce the risk of corrosion caused by long-term residue, and improve the structural stability of the box frame 1, avoiding deformation caused by stress concentration at right-angle corners during collision.

[0030] The box frame 1 has an installation space inside, and an installation opening is provided on one side; a crossbeam 19 is fixed in the middle of the installation opening of the box frame 1, which divides the installation opening into a left doorway 11 and a right doorway 12 corresponding to the left door assembly 2 and the right door assembly 3.

[0031] The left door assembly 2 and the right door assembly 3 are rotatably connected to the box frame 1 via hinges 8, and can close the corresponding left door 11 and right door 12.

[0032] A frame 13 is formed on the outer periphery of the left doorway 11 and the right doorway 12, and a flange 14 is formed on the outer edge of the frame 13; a sealing and waterproofing component is installed on the flange 14 of the left doorway 11 and the right doorway 12.

[0033] The sealing and waterproofing assembly includes an inner waterproofing strip 4 and an outer waterproofing strip 5. The cross-section of the inner waterproofing strip 4 is U-shaped, and the flange 14 is fitted and embedded in the U-shaped groove of the inner waterproofing strip 4. The outer waterproofing strip 5 is fixed to the outer wall of the inner waterproofing strip 4, and the cross-section of the outer waterproofing strip 5 is O-shaped.

[0034] When the left door assembly 2 and the right door assembly 3 are closed, the inner edges of the left door assembly 2 and the right door assembly 3 abut against and fit against the corresponding sealing and waterproof components.

[0035] Reference Figure 3 The sealing and waterproofing components adopt a double sealing design, with the inner waterproofing strip 4 made of fluororubber sealing ring, which is fitted over the flange 14. Fluororubber material has a wide temperature range of -20℃ to 200℃ and can adapt to the high and low temperature environment changes during the operation of engineering machinery. Moreover, the "U"-shaped structure can achieve a tight fit with the box frame 1 through uniform pressure when the left door component 2 and the right door component 3 are closed, effectively preventing liquid intrusion. The outer waterproofing strip is made of nitrile rubber. Nitrile rubber has excellent oil resistance and wear resistance, which can further block fine dust and a small amount of splash water. The double waterproofing strips work together to form a double protection of liquid barrier and dust interception, significantly improving the sealing level of the control box.

[0036] The top walls of both the left door assembly 2 and the right door assembly 3 are bent to form water guide channels 21, and the front side of the cabinet frame 1 has an eave 15 corresponding to the top of the left door assembly 2 and the right door assembly 3. When the control box is exposed to outdoor rain or high-frequency washing, the eave 15 provides some protection against rainwater, and the water guide channels 21 can quickly guide the water flow down the side of the cabinet, preventing the water from directly contacting the joint between the double door assembly and the main body of the cabinet, thus reducing the risk of liquid intrusion from the source.

[0037] Reference Figure 4 Each of the left door assembly 2, right door assembly 3, and the housing frame 1 is equipped with a door panel guide component 9. This door panel guide component 9 includes a door panel guide groove bracket 91, an inner upper bracket 92, and a limiting bracket 93. The door panel guide groove bracket 91 is fixed to the inner wall of the corresponding left door assembly 2 or right door assembly 3. The inner upper bracket 92 is fixed to the inner top wall of the housing frame 1. One end of the limiting bracket 93 is rotatably connected to the upper bracket, and the other end is slidably connected to the guide groove on the door panel guide groove bracket 91. The door panel guide component 9 can limit the maximum opening angle of the left door assembly 2 and right door assembly 3 to 90°-120°, preventing damage to the hinge 8 caused by excessive door opening. It also provides auxiliary fixation for the closed left door assembly 2 and right door assembly 3, further reducing door swaying caused by vibration.

[0038] It also includes a left-side mounting plate 16, a right-side mounting plate, a component mounting plate 17, and a bottom mounting plate 18. The left-side mounting plate 16 and the right-side mounting plate are fixed to the left and right sides inside the cabinet frame 1, respectively. The component mounting plate 17 is fixed to the inside of the right door assembly 3 or the left door assembly 2 via a bracket. The bottom mounting plate 18 is fixed to the bottom of the cabinet frame 1. The bolt holes on the cabinet frame 1 are pre-installed with rubber plugs. When installing the fixing bolts, the bolt heads can press the rubber plugs to tightly fill the gap between the bolts and the bolt holes, preventing dust and liquid from entering through the bolt holes. Insulating and shock-absorbing pads are set between the side mounting plates, the component mounting plate 17, and the cabinet frame 1. The insulating and shock-absorbing pads can achieve electrical insulation to avoid safety hazards caused by the conductivity of metal parts, and can also absorb the vibration during the operation of engineering machinery, reduce the impact of vibration on the sealing structure, and ensure long-term stability of the sealing performance.

[0039] The connection gap between the bottom mounting plate 18 and the enclosure frame 1 is sealed with expanding foam. The expanding foam tightly fills gaps, corners, and irregular spaces, forming a continuous, unbroken sealing layer. After curing, it firmly bonds to the plate, avoiding leakage caused by uneven application of traditional adhesive strips and enhancing the connection strength between the bottom mounting plate 18 and the enclosure frame 1. The bottom mounting plate 18 has wiring holes fitted with IP67-rated waterproof inserts. Silicone gaskets are placed on the contact surfaces between the waterproof inserts and the bottom mounting plate 18. This double sealing ensures that the protection level of the wiring locations is consistent with the overall control box, meeting the wiring requirements of electrical components while preventing liquid and dust intrusion.

[0040] It also includes lifting rings 6, which are symmetrically arranged on the top of the enclosure frame 1. The reinforcing ribs of the lifting rings 6 are fixed to the end of the lifting rings 6 that penetrates the enclosure frame 1 and are attached to the inner wall of the enclosure frame 1. The contact surfaces between the lifting rings 6 and the enclosure frame 1 are polished to ensure that they are flat and burr-free, and fluororubber sealing gaskets are installed between the contact surfaces. Fluororubber has excellent weather resistance and sealing performance, which can prevent leakage caused by the aging of the sealing gaskets during long-term use. At the same time, the reinforcing ribs of the lifting rings 6 can enhance the load-bearing capacity of the lifting components and meet the load requirements during the handling and installation of the control box.

[0041] It also includes a door lock 7, which is installed on the right door assembly 3 and the left door assembly 2 to lock the right door assembly 3 and the left door assembly 2 to the box frame 1; there are multiple door locks 7, and the multiple door locks 7 are evenly distributed along the height direction of the right door assembly 3 and the left door assembly 2; when the multiple door locks 7 are locked simultaneously, the pressure on the contact surface between the right door assembly 3, the left door assembly 2 and the box frame 1 is uniform.

[0042] Neither the right door assembly 3 nor the left door assembly 2 is directly locked to the upper or lower sides of the cabinet frame 1. Instead, the right door assembly 3 and the left door assembly 2 are fixedly connected to the crossbeam 19 via door locks 7. The locking of the right door assembly 3 and the left door assembly 2 does not depend on the upper or lower sides of the cabinet frame 1, but is fixedly connected to the crossbeam 19 via door locks 7. The crossbeam 19 is located inside the main body of the cabinet and corresponds to the middle of the joint of the right door assembly 3 and the left door assembly 2. This connection method can prevent the door gaps of the right door assembly 3 and the left door assembly 2 from shaking due to vibration. At the same time, there are multiple door locks 7, which are evenly distributed along the height direction of the double door assembly. When multiple door locks 7 are locked simultaneously, the pressure on the contact surface between the right door assembly 3 and the left door assembly 2 and the main body of the cabinet is uniform, avoiding local gaps caused by single locking and further enhancing the sealing effect.

[0043] Both the left door assembly 2 and the right door assembly 3 have three hinges 8 that connect to the housing frame 1. These three hinges 8 are spaced apart along the height of the right door assembly 3 and the left door assembly 2, with the distance between the two upper hinges 8 being smaller than the distance between the two lower hinges 8. The bushings of the hinges 8 have built-in rubber seals. This spacing design effectively distributes the self-weight load of the left door assembly 2 and the right door assembly 3, preventing door deformation caused by concentrated weight during long-term use and ensuring the fitting accuracy between the left door assembly 2 and the right door assembly 3 and the housing body. Simultaneously, the built-in rubber seals in the bushings of the hinges 8 effectively prevent rainwater and dust from entering through the hinge 8 shaft holes, solving the problem of easy leakage in traditional hinges 8.

[0044] A groove is provided at the connection between the hinge 8 and the housing frame 1, and the end of the hinge 8 is placed in the groove. A protrusion is formed on the inner edge of the housing frame 1 corresponding to the connection of the hinge 8, and the periphery of the protrusion is sealed with expanding foam. The groove at the connection, with the end of the hinge 8 placed in the groove, forms a physical barrier, which can initially prevent dust and splash water from contacting the connection gap. The protrusion and the groove of the hinge 8 form double protection, further improving the sealing reliability of the connection position of the hinge 8.

[0045] Through the above specific implementation methods, the structure of this low-voltage electrical control box for construction machinery can achieve an IP67 protection level, that is, it is completely dustproof and can be immersed in 1 meter of water for 30 minutes without affecting its internal electrical performance. It is suitable for harsh working conditions such as outdoor, humid, and dusty environments. At the same time, it has the advantages of high reliability, low maintenance rate, and long service life, which can fully meet the usage requirements of construction machinery for low-voltage electrical control boxes.

[0046] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A low-voltage electrical control box for engineering machinery, characterized in that: Includes a box frame (1), a sealing and waterproofing assembly, a left door assembly (2), and a right door assembly (3); The box frame (1) is an integral structure. The box frame (1) has an installation space inside and an installation opening on one side. A crossbeam (19) is fixed in the middle of the installation opening of the box frame (1), which divides the installation opening into a left doorway (11) and a right doorway (12) corresponding to the left door assembly (2) and the right door assembly (3). The left door assembly (2) and the right door assembly (3) are rotatably connected to the box frame (1) via hinges (8) and can close the corresponding left doorway (11) and right doorway (12); A frame (13) is formed on the outer periphery of the left doorway (11) and the right doorway (12), and a flange (14) is formed on the outer edge of the frame (13); the sealing and waterproofing component is installed on the flange (14) of the left doorway (11) and the right doorway (12); The sealing and waterproofing assembly includes an inner waterproof strip (4) and an outer waterproof strip (5). The cross-section of the inner waterproof strip (4) is U-shaped. The flange (14) is fitted and embedded in the U-shaped groove of the inner waterproof strip (4). The outer waterproof strip (5) is fixed to the outer wall of the inner waterproof strip (4). The cross-section of the outer waterproof strip (5) is O-shaped. When the left door assembly (2) and the right door assembly (3) are closed, the edges of the left door assembly (2) and the right door assembly (3) abut against and fit against the outer waterproof strip (5) of the corresponding sealing and waterproofing assembly.

2. The low-voltage electrical control box for engineering machinery according to claim 1, characterized in that: The inner waterproof strip (4) is made of fluororubber sealing ring, and the outer waterproof strip (5) is made of nitrile rubber strip.

3. The low-voltage electrical control box for engineering machinery according to claim 1, characterized in that: The top walls of the left door assembly (2) and the right door assembly (3) are bent to form water guide grooves (21), and the front side of the box frame (1) has an eave (15) corresponding to the top of the left door assembly (2) and the right door assembly (3).

4. The low-voltage electrical control box for engineering machinery according to claim 1, characterized in that: It also includes a door lock (7), which is installed on the right door assembly (3) and the left door assembly (2) to lock the right door assembly (3) and the left door assembly (2) to the box frame (1); there are multiple door locks (7), and the multiple door locks (7) are arranged along the height direction of the right door assembly (3) and the left door assembly (2); when the multiple door locks (7) are locked simultaneously, the pressure on the contact surface between the right door assembly (3) and the left door assembly (2) and the box frame (1) is uniform.

5. A low-voltage electrical control box for engineering machinery according to claim 1, characterized in that: The bottom surface of the box frame (1) is provided with a bottom mounting plate (18), and the connection gap between the bottom mounting plate (18) and the box frame (1) is sealed with expanding foam; the bottom mounting plate (18) has a wire hole, and an IP67 waterproof plug is installed in the wire hole, and a silicone pad is provided on the contact surface between the waterproof plug and the bottom mounting plate (18).

6. A low-voltage electrical control box for engineering machinery according to any one of claims 1-5, characterized in that: The left door assembly (2) and the right door assembly (3) are each provided with three hinges (8) that connect to the box frame (1). The three hinges (8) are spaced apart along the height direction of the right door assembly (3) and the left door assembly (2), and the distance between the two hinges (8) located above each other is smaller than the distance between the two hinges (8) located below each other. The bushing of the hinge (8) is equipped with a rubber sealing ring.

7. A low-voltage electrical control box for engineering machinery according to claim 6, characterized in that: A groove is provided at the connection between the hinge (8) and the box frame (1), and the end of the hinge (8) is placed in the groove; the inner edge of the box frame (1) corresponding to the connection between the hinge (8) has a protrusion, and the periphery of the protrusion is sealed with expanding foam.

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