Cab with electromagnetic shielding performance

Abstract

The invention relates to the technical field of cab assemblies, in particular to a cab with electromagnetic shielding performance, which comprises a cab body and a windscreen system fixedly mounted on the cab body, door assemblies are mounted on two sides of the cab body through hinges, and a shielding curtain is uniformly adhered to the inside of the cab through adhesive tape buckles. The windshield glass system is composed of a glass pressing plate, a rubber pressing plate, a shielding glass belt frame assembly and a conductive shielding rubber gasket, the installation position, located on the cab body, of the windshield glass system is coated with conductive paint, the shielding glass belt frame assembly is tightly pressed by the glass pressing plate and the rubber pressing plate, and the conductive shielding rubber gasket is tightly pressed through a fixing bolt. Therefore, the shielding glass framed assembly is electrically connected with the cab body; a certain electromagnetic protection function can be provided for equipment and personnel in a cab, and the electromagnetic shielding capability is not lower than 40dB in a C-band frequency range; and the improvement of the electromagnetic shielding performance does not reduce other performances of the product.

Description

Technical Field

[0001] This invention relates to the field of cab assembly technology, and more specifically to a cab with electromagnetic shielding performance. Background Technology

[0002] The existing cab primarily ensures driving and passenger functions. To guarantee good visibility, a large windshield and door windows are installed. Numerous openings are pre-drilled in the vehicle body for wiring harnesses, conduits, and other components to enter and exit the cab, as well as for the installation of functional parts. Sealing strips are installed on moving parts such as doors to ensure rainproof and airtight sealing. Without electromagnetic shielding, the overall shielding effectiveness of the cab is less than 20dB. Electromagnetic waves can enter the cab through the glass, wiring harnesses, openings, and door gaps, causing interference and damage to equipment inside the cab, and potentially harming the occupants.

[0003] The existing technology has the following drawbacks:

[0004] 1) The cab body is a welded steel plate structure. In order to fix the internal components, mounting holes and connecting nuts are reserved on the body. After the components are installed, the holes cannot be completely sealed. Electromagnetic waves will enter the cab through the mounting holes reserved on the cab body.

[0005] 2) Ordinary glass does not have electrical conductivity. The glass and the glass frame are made of different materials and cannot achieve electrical conductivity. They cannot block electromagnetic waves from penetrating and cannot suppress or weaken electric and magnetic fields.

[0006] 3) The surface of the cab is coated with ordinary paint, which does not have conductive properties and cannot achieve a continuous conductive connection between the cab body and the external installed components.

[0007] 4) Ordinary sealing strips and rubber gaskets do not have conductive properties and cannot achieve conductive connection between the installed components and the main body.

[0008] 5) Electromagnetic waves can enter the cab along wiring harnesses that have not been shielded or filtered. Summary of the Invention

[0009] In view of the problems existing in the prior art, the purpose of this invention is to provide a driver's cab with electromagnetic shielding performance.

[0010] The technical solution adopted by the present invention to solve its technical problem is: a cab with electromagnetic shielding performance, including a cab body and a windshield glass system fixedly installed on the cab body. The cab body has door assemblies installed on both sides by hinges. The interior of the cab is uniformly glued with shielding curtains by adhesive tape. The windshield glass system consists of a glass pressure plate, a rubber pressure plate, a shielding glass frame assembly, and a conductive shielding rubber gasket. The windshield system is coated with conductive coating at the installation position of the cab body. The glass pressure plate and the rubber pressure plate press the shielding glass frame assembly tightly. The conductive rubber gasket is pressed by fixing bolts to make the shielding glass frame assembly electrically connected to the cab body.

[0011] Preferably, the shielded glass frame assembly consists of a glass assembly and a glass mounting frame. The glass assembly is provided with an electromagnetic shielding film and a conductive mesh inside. One end of the conductive mesh is connected to the electromagnetic shielding film, and the other end is connected to the glass mounting frame through conductive adhesive, so as to conduct electricity between the electromagnetic shielding film and the glass mounting frame.

[0012] Preferably, the cab body is further provided with a pipeline harness, which includes pipelines and cab wiring harness. The pipelines are covered with a metal braided anti-surge sleeve and fixed by clamps. The pipelines pass through the openings of the cab body, and then the metal braided anti-surge sleeve is pressed onto the cab body by bolts through the pressure plate. The paint around the openings of the cab body is removed and a conductive coating is evenly applied to enable electrical connection between the metal braided anti-surge sleeve and the cab body.

[0013] Preferably, the cab wiring harness adopts a metal connector through-wall structure, the cab wiring harness is centrally installed at the front of the cab body, the through-wall connector of the cab wiring harness is uniformly coated with conductive coating, and the through-wall connector of the cab wiring harness is electrically connected to the cab body through a conductive shielding rubber gasket.

[0014] Preferably, the door assembly includes a door glass system, a door welding assembly, and a door sealing strip. The door sealing strip is snapped onto the door frame stop edge of the cab body. The door frame stop edge of the cab body is coated with conductive paint to ensure electrical connection between the door sealing strip and the cab body after installation. The part of the door welding assembly that contacts the door sealing strip is coated with conductive paint. The door welding assembly makes contact with the door sealing strip after pressing it, thereby ensuring electrical connection between the door glass system, the door welding assembly, the door sealing strip, and the cab body.

[0015] Preferably, the shielding curtain comprises a shielding cloth assembly, conductive hook and loop fasteners, and a door shielding curtain assembly. The base material of the shielding cloth assembly is a copper-nickel composite flexible shielding cloth. The hook side of the conductive hook and loop fasteners is fixed by stitching and coated with conductive paint. The door shielding curtain assembly has a three-layer structure, with the inner and outer layers being Oxford cloth and the middle layer being a copper-nickel composite flexible shielding cloth.

[0016] Preferably, the cab body is also provided with a body cover plate, which is used to cover the holes reserved on the cab body. The mounting surface of the body cover plate is uniformly coated with conductive coating, and the corresponding mounting position of the cab body is also coated with conductive coating. After installation, the body cover plate is electrically connected to the cab body through a conductive shielding rubber gasket.

[0017] Preferably, the cab body has an electrical lighting fixture wiring harness mounting hole, the mounting surface of the electrical lighting fixture is sprayed with conductive shielding coating, the outer surface of the wiring harness is covered with flexible shielding cloth, the mounting hole on the cab body is uniformly coated with conductive coating, and the electrical lighting fixture is electrically connected to the cab body after being fixed with bolts.

[0018] Preferably, the cab body is equipped with a steering column, and the mounting surfaces of the cab body and the steering column are coated with conductive shielding paint and electrically connected to the cab body by fixing bolts.

[0019] Preferably, each mounting component within the cab body is provided with a blind hole nut seat that is fully welded for installation.

[0020] The present invention has the following beneficial effects:

[0021] 1) Based on the existing cab, the shielding performance is improved by modifying the cab body structure, replacing functional components such as glass and sealing strips, and adding auxiliary measures such as applying shielding coatings and installing shielding curtains;

[0022] 2) Based on electromagnetic shielding theory and material properties, steel plates have good conductivity, and a small material thickness can achieve high shielding efficiency. The current cab body uses bulletproof steel plates, which have good shielding performance. This invention mainly solves the problems of sealing holes in the cab body, improving the shielding performance of the windshield glass, electrical connection between the installation parts and the body, sealing holes in the wiring harness and conduit, and reducing electromagnetic leakage in the door gaps.

[0023] 3) It can provide certain electromagnetic protection for equipment and personnel in the driver's cab, and the electromagnetic shielding capability is not less than 40dB in the C-band frequency range;

[0024] 4) Applicable to various modified chassis, the improvement in electromagnetic shielding performance does not reduce other performance characteristics of the product. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 This is a schematic diagram of the electromagnetic leakage prevention structure of the driver's cab body according to the present invention.

[0027] Figure 3 This is a schematic diagram of the wall-penetrating structure of the lamp of the present invention.

[0028] Figure 4 This is a schematic diagram of the electromagnetic leakage prevention structure of the mounting component of the present invention.

[0029] Figure 5 This is a schematic diagram of the windshield glass system structure of the present invention.

[0030] Figure 6 This is a schematic diagram of the shielding glass frame assembly of the present invention.

[0031] Figure 7 This is a schematic diagram of the pipeline electromagnetic leakage prevention structure of the present invention.

[0032] Figure 8 This is a schematic diagram of the electromagnetic leakage prevention structure for the cab wiring harness of the present invention.

[0033] Figure 9 This is a schematic diagram of the electromagnetic leakage prevention structure of the car door assembly of the present invention.

[0034] Figure 10 This is a schematic diagram of the door sealing strip installation structure of the present invention.

[0035] Figure 11 This is a schematic diagram of the electromagnetic leakage prevention structure of the vehicle body cover of the present invention.

[0036] Figure 12 This is a schematic diagram of the installation structure of the flexible shielding curtain system of the present invention.

[0037] In the diagram: 1. Cab body, 1-1 blind hole nut seat, 1-2 electrical lights, 1-3 steering column, 1-4 conductive rubber gasket; 2. Windshield system, 2-1 glass pressure plate, 2-2 rubber pressure plate, 2-3 shielded glass frame assembly, 2-4 conductive shielding rubber gasket, 2-5 glass assembly, 2-6 glass mounting frame; 3. Pipeline harness, 3-1 pipeline, 3-2 cab wiring harness, 3-3 metal braided anti-surge sleeve, 3-4 clamp, 3-5 pressure plate, 3-6 conductive rubber gasket; 4. Door assembly, 4-1 door glass system, 4-2 door welding assembly, 4-3 door sealing strip; 5. Body cover, 5-1 conductive shielding rubber gasket; 6. Flexible shielding curtain system, 6-1 shielding cloth assembly, 6-2 conductive hook and loop fastener, 6-3 door shielding curtain assembly, 6-4 copper-nickel composite flexible shielding cloth. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] like Figure 1 As shown, a cab with electromagnetic shielding capabilities comprises six parts: a cab body 1, a windshield system 2, a wiring harness 3, a door assembly 4, a body cover 5, and a flexible shielding curtain system 6. The cab body 1 serves as the mounting base for all other components. The windshield system 2 is connected to the cab body 1 by bolts. The wiring harness 3 enters the cab body 1 through holes in the cab body 1, employing a through-wall structure. The door assembly 4 is divided into left and right sides and is hinged to the cab body 1. The body cover 5 conceals pre-drilled holes in the cab body 1 and is secured by bolts. The shielding curtain 6 is evenly adhered to the interior of the cab using hook and loop fasteners and can be quickly disassembled and stored when not in use.

[0040] like Figure 2 As shown, the cab body 1 uses blind hole nut seat 1-1 to replace the welded nuts at each mounting position. The welding method is full welding and applying weld sealant to reduce the hole effect. This measure is mainly reflected in the floor assembly, engine hood assembly, and roof assembly.

[0041] The main technical measures for the cab body 1 are to adjust the fixing method of the mounting parts, reduce the holes and gaps in the body, and perform local electromagnetic shielding treatment on the holes that cannot be eliminated; adjust the wall-passing structures such as steering column 1-3 and pipeline harness 3, perform conductive treatment, and improve the degree of electrical connection with the body.

[0042] The mounting positions of each component on the cab body 1 are masked during the painting process of the cab body 1, and ordinary paint painting is cancelled. A conductive coating is applied to improve the conductivity of the contact points.

[0043] like Figure 3 As shown, the wiring harness mounting holes for the electrical light fixtures 1-2 are located on the cab body 1, with two through-wall structures positioned on different spatial surfaces. These two labyrinthine through-wall structures effectively increase the attenuation of electromagnetic wave reflection. The mounting surfaces of the electrical light fixtures 1-2 are coated with conductive shielding paint, and the outer surface of the wiring harness is covered with flexible shielding cloth to form a continuous conductive layer. The mounting holes on the cab body 1 are uniformly coated with conductive paint. After the electrical light fixtures 1-2 are fixed with bolts, they are electrically connected to the cab body 1, and polyurethane sealant is applied around their perimeter to ensure a tight seal.

[0044] like Figure 4 As shown, before the steering column 1-3 and other mounting components are connected to the cab body 1, the mounting surface is treated with paint removal, coated with conductive shielding paint, and after the conductive shielding rubber gasket 1-4 is installed, it is electrically connected to the cab body 1 through fixing bolts to achieve electrical connection.

[0045] like Figure 5As shown, the windshield glass system 2 consists of a glass pressure plate 2-1, a rubber pressure plate 2-2, a shielded glass frame assembly 2-3, and a conductive shielded rubber gasket 2-4. During installation, the installation location of the cab body 1 is treated with paint removal and coated with conductive paint. The glass pressure plate 2-1 and the rubber pressure plate 2-2 are used to press the shielded glass frame assembly 2-3 tightly during installation. The conductive rubber gasket 2-4 is tightened by fixing bolts to achieve electrical connection between the shielded glass frame assembly 2-3 and the cab body 1.

[0046] like Figure 6 As shown, the shielded glass frame assembly 2-3 consists of a glass assembly 2-5 and a glass mounting frame 2-6. The glass assembly 2-5 has an electromagnetic shielding film inside to achieve the electromagnetic shielding performance of the glass. A conductive mesh is added, with one end of the conductive mesh connected to the electromagnetic shielding film and the other end connected to the glass mounting frame 2-6 through conductive adhesive, so that the electromagnetic shielding film and the glass mounting frame are connected.

[0047] The door assembly 4 is equipped with a door glass system, which has the same structure and installation method as the windshield glass system.

[0048] like Figure 7 As shown, utilizing the waveguide cutoff principle, the wiring harness 3 includes a conduit 3-1 and a cab wiring harness 3-2. Conduit 3-1 employs a "mounting pressure plate + metal braided anti-wave sleeve" design to reduce electromagnetic leakage through the opening in the cab body 1. Before installation, conduit 3-1 is covered with a metal braided anti-wave sleeve 3-3 and secured with clamps 3-4. After passing through the opening in the cab body 1, bolts are used to pass through the pressure plate 3-5 to press the metal braided anti-wave sleeve 3-3 firmly onto the cab body 1. The perimeter of the opening in the cab body 1 is treated with paint removal and uniformly coated with conductive paint to achieve electrical connection between the metal braided anti-wave sleeve 3-3 and the cab body 1, utilizing the waveguide principle to significantly attenuate electromagnetic waves.

[0049] like Figure 8 As shown, the cab wiring harness 3-2 adopts a wall-mounted, centralized installation method using an aviation plug. Both the aviation plug and the wall-mounted connector are metal structures. The cab wiring harness 3-2 uses a metal connector wall-mounted structure and is centrally installed at the front of the cab body 1. The mounting surface of the cab wiring harness 3-2 wall-mounted connector is not painted, but uniformly coated with conductive paint. The original rubber gasket is replaced with a conductive shielding rubber gasket 3-6. The corresponding installation position on the cab body 1 is also coated with conductive paint. After installation, the electrical connection between the cab wiring harness 3-2 wall-mounted connector, the conductive shielding rubber gasket 3-6, and the cab body 1 is achieved.

[0050] like Figure 9 As shown, the door assembly 4 includes a door glass system 4-1, a door welding assembly 4-2, and a door sealing strip 4-3. The door glass system 4-1 has the same structure and installation method as the windshield system 2.

[0051] like Figure 10 As shown, the door sealing strip 4-3 is secured to the door frame stop edge of the cab body 1. The door frame stop edge of the cab body 1 has undergone paint removal treatment and is coated with conductive paint to ensure electrical connection between the door sealing strip 4-3 and the cab body 1 after installation. The part of the door welding assembly 4-2 that contacts the door sealing strip 4-3 has also undergone paint removal treatment and is coated with conductive paint. When the door is closed, the door welding assembly 4-2 presses against the door sealing strip 4-3, achieving electrical connection between the door glass system 4-1, the door welding assembly 4-2, the door sealing strip 4-3, and the cab body 1.

[0052] like Figure 11 As shown, the mounting surface of the vehicle cover 5 is treated with paint removal and uniformly coated with conductive coating. The original rubber gasket is removed and replaced with a conductive shielding rubber gasket 5-1. The corresponding mounting position of the cab body 1 is also coated with conductive coating. After installation, the cover 5, the conductive shielding rubber gasket 5-1, and the cab body 1 are electrically connected.

[0053] like Figure 12 As shown, the flexible shielding curtain system 6 includes a shielding fabric assembly 6-1, conductive hook and loop fasteners 6-2, and a door shielding curtain assembly 6-3. The base material of the shielding fabric assembly 6-1 is a copper-nickel composite flexible shielding fabric 6-4. The hook side of the conductive hook and loop fasteners 6-2 is fixed by stitching. The conductive hook and loop fasteners 6-2 are reinforced hook and loop fasteners, coated with a conductive coating to achieve conductive properties. The door shielding curtain assembly 6-3 has a three-layer structure: the inner and outer layers are Oxford cloth, and the middle layer is a copper-nickel composite flexible shielding fabric 6-4. The three layers are firmly connected by molding, resulting in a smooth, un-delaminated surface. The napped side of the conductive hook and loop fasteners 6-2 is stitched to the shielding curtain. The shielding curtain is equipped with a dedicated storage bag with clear external markings, allowing for quick disassembly and storage when not in use.

[0054] To achieve conductive continuity, conductive shielding coatings are required in many locations. Before applying the shielding coating, all locations must be cleaned to ensure they are free of water stains, oil, and other foreign matter. The shielding coating is then applied evenly according to the locations and dimensions specified in the design drawings, with a coating thickness of (80±20) μm. For other locations, the coating is applied according to the requirements for the cab painting. The joints between the shielding coating and ordinary paint must be smooth and uniform, without any defects such as exposed substrate or splashes. The adhesion must meet the ≤1 level requirements in GB / T 9286, and the surface resistivity must reach ≤1Ω.

[0055] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0056] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A driver's cab with electromagnetic shielding properties, characterized in that, The system includes a cab body and a windshield glass system fixedly installed on the cab body. Door assemblies are installed on both sides of the cab body via hinges. Shielding curtains are evenly adhered to the interior of the cab via adhesive tape. The windshield glass system consists of a glass pressure plate, a rubber pressure plate, a shielding glass frame assembly, and a conductive shielding rubber gasket. The windshield system is coated with conductive paint at its installation position on the cab body. The glass pressure plate and rubber pressure plate press the shielding glass frame assembly tightly. The conductive rubber gasket is tightened by fixing bolts to ensure electrical connection between the shielding glass frame assembly and the cab body.

2. The driver's cab with electromagnetic shielding performance according to claim 1, characterized in that, The shielded glass frame assembly consists of a glass assembly and a glass mounting frame. The glass assembly contains an electromagnetic shielding film and a conductive mesh. One end of the conductive mesh is connected to the electromagnetic shielding film, and the other end is connected to the glass mounting frame through conductive adhesive, so as to conduct electricity between the electromagnetic shielding film and the glass mounting frame.

3. The driver's cab with electromagnetic shielding performance according to claim 1, characterized in that, The cab body is also equipped with a pipeline harness, which includes pipelines and cab wiring harnesses. The pipelines are covered with metal braided anti-surge sleeves and fixed by clamps. The pipelines pass through the openings of the cab body and then the metal braided anti-surge sleeves are pressed onto the cab body by bolts through the pressure plate. The paint around the openings of the cab body is removed and a conductive coating is evenly applied to make the metal braided anti-surge sleeves electrically connected to the cab body.

4. The driver's cab with electromagnetic shielding performance according to claim 3, characterized in that, The cab wiring harness adopts a metal connector through-wall structure. The cab wiring harness is centrally installed at the front of the cab body. The through-wall connector of the cab wiring harness is uniformly coated with conductive paint. The through-wall connector of the cab wiring harness is electrically connected to the cab body through a conductive shielding rubber gasket.

5. The driver's cab with electromagnetic shielding performance according to claim 1, characterized in that, The door assembly includes a door glass system, a door welding assembly, and a door sealing strip. The door sealing strip is snapped onto the edge of the door frame stop of the cab body. The edge of the door frame stop of the cab body is coated with conductive paint to ensure electrical connection between the door sealing strip and the cab body after installation. The part of the door welding assembly that contacts the door sealing strip is coated with conductive paint. The door welding assembly makes contact with the door sealing strip after pressing it, thereby ensuring electrical connection between the door glass system, the door welding assembly, the door sealing strip, and the cab body.

6. The driver's cab with electromagnetic shielding performance according to claim 1, characterized in that, The shielding curtain consists of a shielding cloth assembly, conductive hook and loop fasteners, and a door shielding curtain assembly. The base material of the shielding cloth assembly is a copper-nickel composite flexible shielding cloth. The hook side of the conductive hook and loop fasteners is fixed by stitching and coated with conductive paint. The door shielding curtain assembly has a three-layer structure, with the inner and outer layers being Oxford cloth and the middle layer being a copper-nickel composite flexible shielding cloth.

7. The driver's cab with electromagnetic shielding performance according to claim 1, characterized in that, The cab body is also provided with a body cover plate, which is used to cover the holes reserved on the cab body. The mounting surface of the body cover plate is uniformly coated with conductive paint, and the corresponding mounting position of the cab body is also coated with conductive paint. After installation, the body cover plate is electrically connected to the cab body through a conductive shielding rubber gasket.

8. The driver's cab with electromagnetic shielding performance according to claim 1, characterized in that, The cab body has mounting holes for the electrical lighting fixtures and wiring harnesses. The mounting surfaces of the electrical lighting fixtures are coated with conductive shielding paint, and the outer surface of the wiring harnesses is covered with flexible shielding cloth. The mounting holes on the cab body are uniformly coated with conductive paint. After the electrical lighting fixtures are fixed with bolts, they are electrically connected to the cab body.

9. The driver's cab with electromagnetic shielding performance according to claim 1, characterized in that, The cab body is equipped with a steering column, and the mounting surfaces of the cab body and the steering column are coated with conductive shielding paint and electrically connected to the cab body through fixing bolts.

10. The driver's cab with electromagnetic shielding performance according to claim 1, characterized in that, Each mounting component within the cab body is equipped with a blind hole nut seat that is fully welded for installation.

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