Explosion-proof lamp shield and process method

Abstract

The invention relates to the field of mining explosion-proof lamps, and discloses an explosion-proof lamp shield and a method thereof.The explosion-proof lamp shield is divided into a shield frame, a shield plate and a protective net and is composed of a positioning ring, a connecting ring, a supporting rod, positioning nails and the like. According to the explosion-proof lamp shield, a plurality of independent components are assembled in a pure mechanical mode to form the completely independent shield, the shield can be easily separated from or assembled with a light source body of a lamp, and the lamp can be conveniently cleaned and maintained; the components of the shield can be separately sprayed with paint or plastics, the problem of cross contamination caused by multi-color matching of the appearance of the shield of the explosion-proof lamp is solved, processing and manufacturing are convenient, manufacturing cost is greatly reduced, and production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of explosion-proof lamps for mines, and in particular relates to an explosion-proof lamp shield and a process method for lighting underground in coal mines. Background Art

[0002] Mining explosion-proof lamps are lighting facilities with explosion-proof and explosion-proof requirements used in coal mines, mining, chemical industry, scientific research and other industries. The appearance of explosion-proof lamps is generally long or round.

[0003] The national standard "GB / T3836-2021 Electrical Equipment for Explosive Gas Environments" stipulates that a metal shield must be installed outside the glass cover of explosion-proof lamps, and the distance gap between the transparent glass tube and the shield must be ≤10mm. The distance range selected by each lamp manufacturer is generally between 5-8mm, and the spacing size of the protective net on the shield must be ≤50mm. The explosion-proof lamp shield is usually made of high-temperature resistant and high-strength materials that can withstand a certain impact force and temperature changes. It is mainly to improve safety. It can prevent fragments from flying when the lamp explodes, and ensure that the light-transmitting glass cover and lighting source of the lamp are not damaged by falling stones, coal blocks or other objects from the top of the mine tunnel, thereby protecting the surrounding environment and personnel safety. At the same time, it has the functions of focusing, reflecting light, increasing the illumination area of ​​the light source, and increasing the brightness of the light source.

[0004] Since mining explosion-proof lamps are used in high temperature, high humidity and high dust environment in coal mines, the lamps are inevitably covered with dust and coal mud, which seriously affects the heat dissipation and appearance of the lamps, and even reduces the service life of the lamps. Therefore, the protective cover needs to be removed regularly for cleaning. The protective cover of the existing long strip explosion-proof lamps is generally made into a rigid connection with the flameproof shell, and is a non-detachable fixed part. It is directly connected and fixed by four cover rods with threads at both ends and the flameproof shell threaded nuts of the flameproof lamp. The protective net and cover plate composed of several iron rings are spot welded on the cover rods. The advantage of this kind of protective cover is that the structure is simple and easy to manufacture, but because this structure is rigidly connected and fixed, it is difficult to disassemble. If it is forcibly disassembled, it is likely to cause damage to the lamp.

[0005] The published patent technology ZL201110068811.1, a mining explosion-proof lamp that is easy to scrub, has proposed a technology for explosion-proof lamps that are easy to scrub: "It is characterized in that the protective mesh cover outside the transparent tube of the lamp is made into a relatively independent part that can be separated from the working body of the lamp", "It is characterized in that the connection between the working body of the lamp and the protective mesh cover is made into several bayonet holes corresponding to convex and concave, and the working body and the protective mesh cover are connected in a bayonet manner". This technology proposes to make the long strip of protective mesh cover into a relatively independent part that can be separated from the working body, and to make several convex blocks on the right end of the shell seat of the connector with the working body to connect with the protective mesh cover concave.

[0006] However, the protective mesh cover in the above-mentioned patent technology and the current explosion-proof lamp cover have the following problems: (1) The cover is often manufactured by welding, which inevitably leads to large or small welding deformation, low processing efficiency and high production cost. (2) The protective mesh and cover plate are welded to the cover frame, which is very inconvenient to remove and clean the accumulated coal sludge and dirt, and it is difficult to clean them thoroughly. (3) The existence of the boss at the connection between the working body and the cover causes uneven wall thickness of the lamp housing casting, greatly increases the scrap rate of the casting, and also makes the cavity structure of the casting mold complex and increases the difficulty of mold making. In addition, the size of the boss on the casting is difficult to control and requires fine processing to meet the requirements, which increases the production cost. (4) There is bound to be a gap in the concave and convex bayonet connection structure. If the gap is too large, the cover will not be firmly fixed and will shake, affecting the product quality. If the gap is too small, the rotation will be inflexible and cause jamming, affecting the assembly quality. (5) Since the shield has the functions of adjusting the direction of light and focusing and reflecting light, the inner surface of the shield plate and the protective net must be white to reflect light. The back is generally painted yellow, blue or gray depending on the color of the main body of the lamp. However, the shield made of one piece by welding is very unfavorable to the change of the color of the spray-painted appearance. Summary of the invention

[0007] The purpose of the present invention is to provide an explosion-proof lamp shield and a process method to solve the problems raised in the above background technology. The shield of the present invention adopts a purely mechanical assembly method to assemble multiple individual components into a completely independent long strip shield. The shield can be easily separated or assembled from the main body of the lamp light source, which is convenient for cleaning and maintenance of the lamp. The manufacturing and processing are convenient, and the welding process is eliminated to save electricity and improve processing efficiency to the greatest extent. Since the various components are mechanically assembled, they can be sprayed or painted separately to solve the problem of multiple color matching and cross contamination between colors of the lampshade appearance, greatly reduce manufacturing costs and improve production efficiency.

[0008] The present invention provides the following technical solutions: an explosion-proof lamp shield and a process method, which is an overall long strip structure, divided into three parts: a shield frame, a shield plate, and a protective net, and is composed of a positioning ring, a connecting ring, a support rod, a positioning nail, etc.

[0009] The characteristic is that the cover frame is the basis for the shield of the present invention to form a relatively independent component with the lamp, and is also the mounting bearing base of all components, and is composed of a positioning ring, a connecting ring, and a support rod.

[0010] The positioning ring with a sheet-like annular structure is located at the left end of the cover frame, and the three graduated positioning grooves distributed at 120° on it are used for positioning with the positioning pins on the explosion-proof housing of the lamp. The fixing threaded holes of the two support rods on the positioning ring are fixed with the support rod threads, and the two cover plate countersunk holes are aligned with the two curling holes on the left end of the cover plate and fixed to realize the connection with the positioning ring. The bolt at one end of the guard net passes through the left countersunk hole of the guard net and is fixed with a nut.

[0011] Furthermore, the positioning pins are important connecting parts for connecting and disconnecting the shield of the present invention from the lamp body, and cooperate with the graduated positioning grooves on the positioning ring to realize the rotational installation and rotational disconnection of the shield. Three positioning pins distributed at an angle of 120° are respectively installed and fixed on the end faces of the explosion-proof casing of the lamp.

[0012] The further connecting ring is a sheet-like annular structure, which is located at the right end of the shield, and is provided with two support rod fastening countersunk holes of the support rods, two cover plate countersunk holes and a right countersunk hole of the protective net.

[0013] Furthermore, the support rod is the basic component that forms the shield frame. The current shield is often composed of four support rods to form the shield frame. The present invention uses only two support rods to fully meet the strength requirements of the shield body after being positioned and fastened with the positioning ring, the connecting ring and the protective net. The left ends of the two support rods are made into support rod threads that cooperate with the two support rod screw holes on the positioning ring, and the right ends are made into support rod inner screw holes connected to the connecting ring. The outer circles of the two support rods are machined with spiral grooves that can be assembled with the protective net.

[0014] The main function of the cover plate is to reflect light, improve the utilization rate of light and act as a reflector, while protecting the light source and the glass tube. The cover plate is semicircular, and the longitudinal sides of the cover plate are made into curling holes, the purpose of which is to increase the strength of the cover plate and have the function of being connected and fixed with the positioning ring and the connecting ring by screws.

[0015] The protective net is used to protect the transparent glass tube and the light source of the lamp from collision with external forces. The existing protective net is generally processed into a plurality of circular rings and then welded on the frame of the protective net, which has high processing efficiency and low cost. The protective net of the shield of the present invention is wound into a spring shape, and the left end external thread and the right end external thread are processed at the tail of the left and right ends.

[0016] A method for manufacturing an explosion-proof lamp shield, comprising the steps of processing and assembling:

[0017] S1: The positioning ring and connecting ring are formed by stamping process.

[0018] S2: The support rod is processed with an external thread on the left end and an internal thread on the right end, and a spiral groove is processed on its outer circle.

[0019] S3: Wind a spring-shaped guard net according to the pitch requirements, and process the external threads on the left and right ends of the guard net.

[0020] S4: The cover plate is punched into shape using a special punching die.

[0021] S5: Spray-paint each component according to color requirements.

[0022] S6: The left end support rod threads of the two support rods are matched with the support rod screw holes on the positioning ring and tightened, the protective net is assembled with the spiral groove on the support rod, the external thread at the left end of the protective net is inserted into the fixed countersunk hole and fastened with a nut; the right end of the protective net The external thread is inserted into the right countersunk hole of the protective net on the connecting ring and is aligned and fastened with a nut. After the right end of the support rod is adjusted and aligned with the support rod fastening countersunk hole on the connecting ring, it is tightened and fixed with the support rod screw.

[0023] S7: Use the cover plate screws, positioning rings and connecting rings to complete the assembly of the cover plate.

[0024] S8: After assembly, the protective cover is inserted into the main body of the explosion-proof lamp, and the locking screw is tightened so that the protective cover and the lamp become one. Unscrew the locking screw and turn the protective cover clockwise to separate the protective cover from the main body of the lamp.

[0025] The beneficial effects of the present invention are as follows: (1) A completely independent shield is formed by assembling multiple individual components by purely mechanical installation, which can be easily separated from or assembled with the light source body of the lamp, making it convenient to clean and maintain the lamp. (2) Each component is mechanically assembled and can be separately sprayed with paint or plastic, solving the problem of multiple color matching and color cross-contamination of the appearance of the explosion-proof lamp shield. (3) The manufacturing and processing are convenient, which greatly reduces the manufacturing cost and improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of an explosion-proof lamp shield of the present invention;

[0027] Figure 2 This is a left view of an explosion-proof lamp shield of the present invention;

[0028] Figure 3 This is a right view of an explosion-proof lamp shield of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of an explosion-proof lamp shield and protective net of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of an explosion-proof lamp shield plate of the present invention;

[0031] Figure 6 This is a schematic diagram of an explosion-proof lamp shield assembly of the present invention

[0032] Description of reference numerals:

[0033] 01. Protective cover; 02. Light source body; 03. Explosion-proof housing; 001. Cover frame; 002. Cover plate; 003. Protective net; 1. Positioning ring; 2. Support rod thread; 3. Locking hole; 4. Support rod; 5. Spiral groove; 8. Support rod inner screw hole; 9. Connecting ring; 10. Support rod screw; 11. Support rod; 12. Support rod inner screw hole; 13. Support rod screw; 14. Cover plate screw; 15. Cover plate screw; 16. Support rod screw hole; 17. Support rod screw hole; 18. Protective net nut; 19. Positioning hole; 20. Cover plate screw; 21. Cover plate screw; 22. Connecting hole; 23. Protective net screw 24, indexing positioning groove; 25, indexing positioning groove; 26, indexing positioning groove; 27, slot hole; 28, slot hole; 29, slot hole; 30, positioning pin; 31, positioning pin; 32, positioning pin; 33, left end external thread; 34, right end external thread; 35, crimping hole; 36, crimping hole; 37, locking screw hole; 38, locking screw; 39, support rod thread; 40, left countersunk hole of guard net; 41, right countersunk hole of guard net; 42, cover plate countersunk hole; 43, cover plate countersunk hole; 44, cover plate countersunk hole; 45, cover plate countersunk hole; 46, support rod fastening countersunk hole; 47, support rod fastening countersunk hole; DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected, set, or it can be detachably connected, set, or connected and set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] An explosion-proof lamp shield and a process method, such as Figure 1-6 As shown, it is a long strip structure, divided into three parts: a cover frame 001, a cover plate 002, and a protective net 003, and is composed of a positioning ring 1, a connecting ring 9, a support rod 4, a support rod 11, a positioning pin 30, a positioning pin 31, a positioning pin 32, etc.

[0036] The feature is that the cover frame 001 is the basis for the explosion-proof lamp shield of the present invention to be a relatively independent component from the lamp, and is also the mounting and bearing base for all components, and is composed of a positioning ring 1, a connecting ring 9, a support rod 4, and a support rod 11.

[0037] The further positioning ring 1 is located at the left end of the cover frame 001, and is in a sheet-like ring structure. It is made of Q235 cold-rolled steel plate and is stamped using a stamping process. The overall structure is a hollow sheet-like ring structure, and a 120° angle dividing positioning groove 24, a dividing positioning groove 25, and a dividing positioning groove 26 are punched out thereon. At the same time, the support rod screw hole 16, the support rod screw hole 17 and the cover plate countersunk hole 42, the cover plate countersunk hole 43 and the left countersunk hole 40 of the protective net are processed.

[0038] Furthermore, positioning pins 30, 31 and 32 are important connectors for connecting and disconnecting the protective cover of the present invention from the main body 02 of the lamp light source, and cooperate with the dividing positioning grooves 24, 25 and 26 on the positioning ring 1 to realize the rotational installation and rotational disconnection of the protective cover 01. The positioning pins 30, 31 and 32 distributed at 120° are respectively installed and fixed on the end faces of the explosion-proof casing 03 of the lamp.

[0039] The further connecting ring 9 is located at the right end of the cover frame 001, and is a hollow sheet-like ring structure. It is made of Q235 cold-rolled steel plate and is stamped in one step using a stamping process. A fastening countersunk hole 46 for fixing the support rod, a fastening countersunk hole 47, a cover plate countersunk hole 45, a cover plate countersunk hole 46 and a right countersunk hole 41 for a protective net are processed thereon.

[0040] Furthermore, the support rod 4 and the support rod 11 are the basic components that form the protective cover frame 001. The left end of the support rod 4 is processed into a support rod thread 2 to be assembled with the support rod screw hole 16 on the positioning ring 1. The left end of the support rod 11 is also processed into a support rod thread 39 to be assembled with the support rod screw hole 17 on the positioning ring 1. The right end of the support rod 4 is processed into a support rod inner screw hole 8 connected to the connecting ring 9. The right end of the support rod 11 is processed into a support rod inner screw hole 12 connected to the connecting ring 9, and a spiral groove 5 that can be assembled with the protective net is processed on the outer circle of the support rod 4 and the support rod 11.

[0041] The cover plate 002 is made of hot-rolled steel plate and is processed into an arc shape using a special stretching die on a stamping equipment. The two longitudinal sides of the cover plate are made into a curling shape to form curling holes 35 and curling holes 36. The positioning ring 1 and the connecting ring 9 are connected and fixed through the curling holes 35 and curling holes 36 using cover plate screws 14, cover plate screws 15, cover plate screws 20, and cover plate screws 21 respectively.

[0042] The protective net 003 is used to protect the transparent glass tube and the light source on the light source body 02 of the lamp from being hit by external forces. The Q235 round disc is wound into a spring shape on a lathe using a special tool according to the 45mm pitch requirement. The length of the guard net is cut according to the length of the guard, and the left end external thread 33 and the right end external thread 34 are processed at the tail of the left and right ends of the guard net.

[0043] A method for manufacturing an explosion-proof lamp shield, comprising the steps of processing and assembling:

[0044] S1: Positioning ring 1 and connecting ring 9 are made of Q235 cold-rolled steel plate and are punched into the required geometric shape and size in one time using a special punching die of a punching equipment.

[0045] S2: Support rods 4 and 11 are made of 45# round steel, and the support rod threads 2 and 39 at the left end and the support rod internal screw holes 8 and 12 at the right end are machined to the required size. Spiral grooves 5 with a pitch of 48mm are machined on the outer circles of support rods 4 and 11 to assemble with protective net 003.

[0046] S3: Select Q235 cold-drawn round steel and use a special spring winding tool on a lathe to wind it into a spring shape according to the 45mm pitch requirement. According to the length of the guard 01, the length of the guard net 003 is cut and the left end external thread 33 and the right end external thread 34 are processed at the tail of the left and right ends of the guard net 003.

[0047] S4: The cover plate 003 is made of hot-rolled steel plate and is formed by a special stamping die. At the same time, the curling holes 35 and the curling holes 36 are processed to meet the size and shape requirements.

[0048] S5: According to the color requirements in the technical standards for explosion-proof lamps, the positioning ring 1, the connecting ring 9, the cover plate 002, the protective net 003, etc. are electrostatically sprayed and colored. The positioning ring 1, the connecting ring 9 and the protective net 003 are white, the inner side of the cover plate 002 is white, and the outer side is colored according to the color of the explosion-proof housing 03 of the lamp.

[0049] S6: The support rod thread 2 at the left end of the support rod 4 and the support rod thread 39 of the support rod 11 are matched with the support rod screw holes 16 and the support rod screw holes 17 on the positioning ring 1 and tightened; the protective net 003 is assembled with the spiral grooves 5 on the support rods 4 and 11, and the left end external thread 33 of the protective net 003 is inserted into the left countersunk hole 40 of the protective net on the positioning ring 1 and is tightened with the protective net nut 18; the right end external thread 34 of the protective net 003 is inserted into the right countersunk hole 41 of the protective net on the connecting ring 9 and is aligned and tightened with the protective net nut 23; the right end of the support rod 4 is aligned with the support rod fastening countersunk hole 46 of the connecting ring 9 and is tightened and fixed with the support rod screw 10, and the right end of the support rod 11 is aligned with the support rod fastening countersunk hole 47 of the connecting ring 9 and is tightened and fixed with the support rod screw 13.

[0050] S7: The curling holes 35 and 36 on the left end of the cover plate 002 are aligned with the cover plate countersunk holes 42 and 43 on the positioning ring 1, and they are tightened with the cover plate screws 14 and 15 respectively; the cover plate countersunk holes 42 and 43 on the connecting ring 9 are aligned with the curling holes 35 and 36 on the right end of the cover plate, and they are tightened with the cover plate screws 20 and 21 respectively to complete the assembly of the shield 01. S8: After the shield 01 is assembled, the positioning hole 19 on the left end positioning ring 1 and the connecting hole 22 on the connecting ring 9 are inserted into the glass cover of the explosion-proof lamp light source body 02. The slots 27, 28 and 29 on the positioning ring 1 on the left end of the shield 01 are aligned with the positioning pins 30, 31 and 32 on the end face of the explosion-proof shell and inserted. The shield 01 is rotated counterclockwise so that the positioning pins 30, 31 and 32 are at the indexing position. After rotating in the positioning groove 24, the indexing positioning groove 25, and the indexing positioning groove 26 to engage with their tail ends, then tighten the locking screw 38 on the locking screw hole 37, and the shield 01 will become one with the lamp. Loosen the locking screw 38, rotate the shield 01 clockwise to align the positioning pins 30, 31, and 32 with the slots 27, 28, and 29 on the positioning ring 1, and then pull them off, so that the shield 01 can be separated from the lamp light source body 02.

[0051] The above is a preferred specific embodiment of the present invention, not the only specific implementation mode of the present invention, and the protection scope of the present invention is not limited thereto. Any technician familiar with the art who, within the technical scope of the present invention, combines the prior art or public common sense and makes equivalent, equivalent replacement or change according to the technical solution and inventive concept of the present invention, shall be covered by the protection scope of the present invention.

Claims

1. An explosion-proof lamp shield, which is an overall long strip structure and consists of a shield frame (001), a shield plate (002), a protective net (003), etc.

2. The explosion-proof lamp shield according to claim 1, characterized in that: The cover frame (001) is composed of a positioning ring (1), a connecting ring (9), a support rod (4), a support rod (11), etc.

3. According to claim 2, an explosion-proof lamp shield, further a positioning ring (1) is located at the left end of the shield frame (001) and is in the form of a sheet-like annular structure, on which are arranged 120° indexing positioning grooves (24), indexing positioning grooves (25), indexing positioning grooves (26), support rod screw holes (16), support rod screw holes (17) and cover plate countersunk holes (42), cover plate countersunk holes (43), and left countersunk holes (40) of the protective net.

4. The explosion-proof lamp shield according to claim 2, characterized in that: Furthermore, positioning pins (30), (31) and (32) distributed at 120 degrees are respectively installed on the end surface of the explosion-proof housing (03) of the lamp, and cooperate with the indexing positioning grooves (24), (25) and (26) on the positioning ring (1) to realize the installation and detachment of the protective cover (01).

5. The explosion-proof lamp shield according to claim 2, characterized in that: A further connecting ring (9) is located at the right end of the cover frame (001) and is in the form of a sheet-like annular structure, on which a support rod fastening countersunk hole (46), a support rod fastening countersunk hole (47), a cover plate countersunk hole (44), a cover plate countersunk hole (45) and a right countersunk hole (41) of the protective net are processed.

6. The explosion-proof lamp shield according to claim 2, characterized in that: Further, the left end of the support rod (4) is processed to form a support rod thread (2) for assembly with the support rod screw hole (16) on the positioning ring (1), and the left end of the support rod (11) is also processed to form a support rod thread (39) for assembly with the support rod screw hole (17) on the positioning ring (1). The right end of the support rod (4) is processed to form a support rod inner screw hole (8) connected to the connecting ring (9), and the right end of the support rod (11) is processed to form a support rod inner screw hole (12) connected to the connecting ring (9). The outer circles of the support rods (4) and (11) are processed to form spiral grooves (5) for assembling the protective net.

7. The explosion-proof lamp shield according to claim 1, characterized in that: The cover plate (002) is processed into an arc shape, and two longitudinal sides are formed with curling holes (35) and curling holes (36). The positioning ring (1) and the connecting ring (9) are connected through the curling holes (35) and curling holes (36) by using cover plate screws (14), cover plate screws (15), cover plate screws (20), and cover plate screws (21).

8. The explosion-proof lamp shield according to claim 1, characterized in that: The protective net (003) is processed into a spring shape, and the tails of the left and right ends thereof are processed into a left end external thread (33) and a right end external thread (34).

9. An explosion-proof lamp shield and a process method, in conjunction with claims 1 to 8, including the processing and assembly steps: S1: The positioning ring (1) and the connecting ring (9) are punched and formed into the required geometric shape and size at one time using a special punching die. S2: The left ends of the support rods (4) and the support rods (11) are machined to form support rod threads (2) and support rod threads (39) and the right ends of the support rods (8) and support rod internal screw holes (12) to the required size, and the outer circumferences of the support rods (4) and the support rods (11) are machined to form spiral grooves (5) with a pitch of 48 mm for assembly with the protective net (003). S3: Use a special tooling on a lathe to process it into a spring shape, cut the length of the guard net (003) according to the length of the guard cover (01), and then process the left end external thread (33) and the right end external thread (34). S4: The cover plate (003) is molded by a stamping die and the curling hole (35) and the curling hole (36) are processed to meet the requirements. S5: The positioning ring (1), the connecting ring (9), the cover plate (002), the protective net (003) and the like are sprayed with plastic and painted. The positioning ring (1), the connecting ring (9) and the protective net (003) are white, the inner surface of the cover plate (002) is white, and the outer surface is colored according to the color of the explosion-proof housing (03) of the lamp. S6: The support rod thread (2) at the left end of the support rod (4) and the support rod thread (39) of the support rod (11) are matched and tightened with the support rod screw holes (16) and the support rod screw holes (17) on the positioning ring (1), and the protective net (003) is assembled with the spiral grooves (5) on the support rod (4) and the support rod (11). The left end external thread (33) of the protective net (003) is inserted into the left countersunk hole (40) of the protective net on the positioning ring (1) and the protective net nut ( 18) is tightened, the right end external thread (34) of the protective net (003) is inserted into the right countersunk hole (41) of the protective net on the connecting ring (9) and then aligned and tightened with the protective net nut (23), the right end of the support rod (4) is aligned with the support rod fastening countersunk hole (46) of the connecting ring (9) and then fixed with the support rod screw (10), and the right end of the support rod (11) is aligned with the support rod fastening countersunk hole (47) of the connecting ring (9) and then fixed with the support rod screw (13). S7: The curling holes (35) and (36) at the left end of the cover plate (002) are aligned with the cover plate countersunk holes (42) and (43) on the positioning ring (1) and are respectively fastened using the cover plate screws (14) and (15); the cover plate countersunk holes (42) and (43) on the connecting ring (9) are aligned with the curling holes (35) and (36) at the right end of the cover plate and are respectively fastened using the cover plate screws (20) and (21) to complete the assembly of the shield (01). S8: After the assembly is completed, the protective cover (01) is inserted into the glass cover of the light source body (02) from the positioning hole (19) on the left end positioning ring (1) and the connecting hole (22) on the connecting ring (9). The slots (27), (28) and (29) on the positioning ring (1) on the left end of the protective cover (01) are aligned with the positioning pins (30), (31) and (32) on the end surface of the explosion-proof shell. The protective cover (01) is rotated counterclockwise so that the positioning pins (30), (31) and (32) are aligned. (32) is rotated counterclockwise in the indexing positioning groove (24), the indexing positioning groove (25), and the indexing positioning groove (26) to engage with the tail end thereof, and the locking screw (38) on the locking screw hole (37) is tightened. The shield (01) is assembled. The locking screw (38) is loosened and the shield (01) is rotated clockwise to align the positioning pins (30), the positioning pins (31), and the positioning pins (32) with the slots (27), the slots (28), and the slots (29) on the positioning ring (1). The positioning pins are then pulled out, and the shield (01) is detached.

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