Explosion-proof shell for laser radar in explosion-proof area

Abstract

The invention relates to an explosion-proof housing for a laser radar in an explosion-proof area, and belongs to the technical field of explosion prevention. According to the invention, the problem that other explosives in the first-class explosion-proof area are detonated due to direct contact between the existing laser radar and the explosive environment in the first-class explosion-proof area is solved. A bonding frame is arranged on the front cover plate, the transparent part is bonded in the bonding frame, the pressing plate is pressed on the transparent part along the edge of the bonding frame, the pressing plate is fixedly connected with the front cover plate through a bolt, the front cover plate is fixedly connected to the end part of the explosion-proof shell through a bolt, and the transparent part is fixedly connected with the pressing plate through a bolt. And the other end part of the explosion-proof shell is fixedly connected with the filling pipe in a threaded manner. The explosion-proof shell has firm structural strength, can bear high pressure generated when the laser radar explodes in the explosion-proof shell and is not damaged, the possibility of detonating other explosives in one type of explosion-proof areas is eradicated, and efficient and lossless transmission of laser radar optical signals is achieved on the premise that explosion-proof sealing is guaranteed through the transparent part.

Description

An explosion-proof housing for lidar in a Class I explosion-proof area Technical Field

[0001] This invention relates to the field of explosion-proof technology, and more particularly to an explosion-proof housing for a lidar system used in a type of explosion-proof area. Background Technology

[0002] The Robin-W lidar product from INNOVUSION is compact in size, allowing for flexible installation in confined areas. It provides excellent sensing results within its ranging capabilities, offering a better sensing solution for monitoring the real-time status of grain in grain silos. When applying lidar to Class I explosion-proof areas, the lidar must meet the requirements for operation within such areas. When operating in a Class I explosion-proof area, the lidar's internal components, such as the laser emitter, detector, circuit board, and motor, all become potential ignition sources. Direct contact between these ignition sources and the explosive atmosphere within the Class I explosion-proof area could have serious consequences. To prevent this, an explosion-proof environment needs to be created for the lidar. Summary of the Invention

[0003] The present invention aims to solve the above-mentioned problems and provides an explosion-proof housing for lidar in a type of explosion-proof area.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: an explosion-proof housing for a lidar in a Class I explosion-proof area, comprising a front cover plate, a transparent component, a pressure plate, an explosion-proof outer shell, and a filler tube. An adhesive frame is provided on the front cover plate, the transparent component is adhered to the adhesive frame, the pressure plate is pressed onto the transparent component along the edge of the adhesive frame, the pressure plate is bolted to the front cover plate, the front cover plate is bolted to one end of the explosion-proof outer shell, and the filler tube is threaded to the other end of the explosion-proof outer shell.

[0005] Furthermore, a lidar is fixedly mounted inside the explosion-proof enclosure.

[0006] Furthermore, a rubber gasket is provided between the transparent component and the pressure plate.

[0007] Furthermore, a retaining ring is provided between the packing tube and the explosion-proof housing.

[0008] Furthermore, a compression nut is threadedly fixed to the end of the packing tube.

[0009] Furthermore, a baffle is provided between the packing tube and the clamping nut.

[0010] Compared with existing technologies, this invention has the following advantages: The explosion-proof enclosure of this invention is designed based on the "explosion-proof" principle and belongs to the "d" type protection in the standard. It does not prevent explosive gases from entering the enclosure, but has sufficient structural strength to withstand the high pressure generated when products such as lidar explode inside the explosion-proof enclosure without damage, thereby eliminating the possibility of igniting other easily explosive materials in the Class I explosion-proof zone; The joint surfaces of the explosion-proof enclosure of this invention are precisely machined to a specific width and length to ensure that the flames and high-temperature gases from the internal explosion are sufficiently cooled to a temperature that cannot ignite other easily explosive materials in the Class I explosion-proof zone when passing through the gaps between the joint surfaces; In this invention, the laser emitted by the lidar passes through the explosion-proof enclosure through a transparent part, achieving efficient and lossless transmission of optical signals while ensuring explosion-proof sealing, thus taking into account both equipment protection and ranging functions. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 is an exploded view of the explosion-proof housing in this invention; Figure 2 is a cross-sectional view of the explosion-proof housing in this invention; Figure 3 is a three-dimensional structural diagram of the explosion-proof housing in this invention; Figure 4 is a structural diagram of the front cover plate in this invention; Figure 5 is a schematic diagram of the positional relationship between the front cover plate and the explosion-proof housing in this invention; Figure 6 is a side view of the explosion-proof housing in this invention; Figure 7 is a structural diagram of the lidar; Figure 8 is a side view of the lidar; Figure 9 is a schematic diagram of the connection relationship between the front cover plate, the transparent part, the explosion-proof housing, and the pressure plate in this invention; Figure 1 Figure 0 is a schematic diagram of the positional relationship between the packing tube and the explosion-proof housing in this invention; Figure 11 is a schematic diagram of the packing tube encapsulation in this invention; Figure 12 is an assembly diagram of the packing tube and the clamping nut in this invention; Figure 13 is a schematic diagram of the positional relationship between the packing tube, the baffle, and the clamping nut in this invention; In the figures: 1, front cover plate; 1-1, adhesive frame; 2, transparent part; 3, rubber gasket; 4, pressure plate; 5, explosion-proof housing; 6, retaining ring; 7, packing tube; 7-1, center section; 8, baffle; 9, clamping nut; 10, lidar. Detailed Implementation

[0013] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0016] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0017] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0018] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0019] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0020] Referring to Figures 1-12, this embodiment describes an explosion-proof housing for a lidar system used in a Class I explosion-proof area. The housing includes a front cover plate 1, a transparent element 2, a pressure plate 4, an explosion-proof outer shell 5, and a filler tube 7. An adhesive frame 1-1 is formed on the front cover plate 1. The transparent element 2 is adhered within the adhesive frame 1-1. The pressure plate 4 is pressed onto the transparent element 2 along the edge of the adhesive frame 1-1. The pressure plate 4 is bolted to the front cover plate 1. The front cover plate 1 is bolted to one end of the explosion-proof outer shell 5. The filler tube 7 is threaded to the other end of the explosion-proof outer shell 5. Specifically, the width L of the mating surface between the adhesive frame 1-1 and the transparent element 2 is 25 mm, the length of the mating surface is 10 mm, the maximum gap is 0.04 mm, and the surface roughness is 3.2 μm. The transparent element 2 is made of 8 mm thick tempered glass. The effective sealing width of the packing tube 7 is set to 27 mm, the wall thickness of the packing tube 7 is 6.85 mm, the length is 40 mm, the length of the packing inside the packing tube 7 is 25 mm, the length of the central section 7-1 of the packing tube 7 is 22 mm, and the filling volume of the packing in the central section occupies at least 20% of the internal space of that section. The diameter of the fixing thread on the packing tube 7 is 33.7 mm, and the connection depth with the explosion-proof housing 5 is 20 mm.

[0021] The explosion-proof enclosure 5 of this invention is designed based on the "explosion-proof" principle and belongs to the "d" type protection in the standard. It does not prevent explosive gases from entering the enclosure, but has a sufficiently robust structural strength to withstand the high pressure generated when products such as the lidar 10 explode inside the explosion-proof enclosure 5 without damage, thereby eliminating the possibility of igniting other explosive materials in the Class I explosion-proof zone. The joint surfaces of the explosion-proof enclosure 5 of this invention are precisely machined to a specific width and length to ensure that the flames and high-temperature gases from the internal explosion are sufficiently cooled to a temperature that cannot ignite other explosive materials in the Class I explosion-proof zone when passing through the gaps between the joint surfaces. In this invention, the laser emitted by the lidar 10 passes through the transparent part 2 and exits the explosion-proof enclosure 5, achieving efficient and lossless transmission of optical signals while ensuring explosion-proof sealing, thus taking into account both equipment protection and ranging functions.

[0022] The explosion-proof housing 5 is internally fixed to the lidar 10. Specifically, the explosion-proof housing 5 is fixedly connected to the lidar 10 by threads. The threads are of M6 specification, with a hole depth of 14mm, a thread depth of 10mm, and a meshing depth of 8mm. All threaded holes are located on the explosion-proof housing.

[0023] A rubber gasket 3 is provided between the transparent component 2 and the pressure plate 4. By setting the rubber gasket 3, the installation pressure of the pressure plate 4 on the transparent component 2 is buffered, preventing the transparent component 2 from breaking; at the same time, the sealing performance is enhanced, ensuring the reliability of explosion-proof; it can also absorb vibration and improve the stability of the overall structure.

[0024] A retaining ring 6 is provided between the packing tube 7 and the explosion-proof housing 5. Specifically, the retaining ring 6 is a shaft retaining ring according to GB / T-894.1. The retaining ring 6 can effectively fix the packing tube 7, preventing it from shifting or loosening within the explosion-proof housing 5, thereby maintaining the design gap of the explosion-proof mating surface for a long time and ensuring the durable explosion-proof safety and sealing reliability of the housing.

[0025] The end of the packing tube 7 is threadedly fixed with a clamping nut 9. The clamping nut 9 provides an adjustable and uniform clamping force through the threaded connection, ensuring the long-term stability and reliability of the packing seal, and can adapt to maintenance needs, facilitating disassembly and repeated tightening, thereby ensuring the long-lasting and effective explosion-proof performance.

[0026] A baffle 8 is provided between the packing tube 7 and the clamping nut 9. By providing the baffle 8 between the clamping nut 9 and the end of the packing tube 7, the clamping force can be effectively dispersed, preventing the clamping nut 9 from directly rotating and squeezing, which could cause damage to the packing or the tube end; at the same time, it enhances the uniformity of pressure transmission, improves sealing reliability, and reduces the risk of loosening during long-term use.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flameproof housing for a lidar system used in a Class I explosion-proof area, characterized in that: The device includes a front cover plate (1), a transparent part (2), a pressure plate (4), an explosion-proof housing (5), and a filling tube (7). An adhesive frame (1-1) is provided on the front cover plate (1). The transparent part (2) is adhered to the adhesive frame (1-1). The pressure plate (4) is pressed onto the transparent part (2) along the edge of the adhesive frame (1-1). The pressure plate (4) is bolted to the front cover plate (1). The front cover plate (1) is bolted to one end of the explosion-proof housing (5). The other end of the explosion-proof housing (5) is threaded to the filling tube (7).

2. The explosion-proof housing for a lidar system in a Class I explosion-proof area according to claim 1, characterized in that: The explosion-proof enclosure (5) is internally fixed with a lidar (10).

3. The explosion-proof housing for a lidar system in a Class I explosion-proof area according to claim 1, characterized in that: A rubber gasket (3) is provided between the transparent part (2) and the pressure plate (4).

4. The explosion-proof housing for a lidar system in a Class I explosion-proof area according to claim 1, characterized in that: A retaining ring (6) is provided between the packing tube (7) and the explosion-proof shell (5).

5. The explosion-proof housing for a lidar system in a Class I explosion-proof area according to claim 1, characterized in that: The end of the packing tube (7) is threadedly fixed with a compression nut (9).

6. The explosion-proof housing for a lidar system in a Class I explosion-proof area according to claim 5, characterized in that: A baffle (8) is provided between the packing tube (7) and the clamping nut (9).

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