Searchlight for bridge construction

Abstract

The invention discloses a searchlight for bridge construction, which relates to the technical field of searchlights for construction and comprises a cross frame fixed at the upper end of a support frame assembly. According to the searchlight for bridge construction, the protective cover protects the lighting assembly and is matched with the fluted disc, the circular sliding block and the square sliding block are matched and drive the adjusting plate to rotate to be away from or contract to be close, the adjusting plate can be opened or contracted, light is prevented from being too dispersed, and the width of light beams can be adjusted; therefore, light gathering and directivity are optimized, the light can irradiate a target area more effectively, light waste is reduced, when the adjusting plate is opened, the fluted disc can drive the heat dissipation mechanism and the brush plate to operate, the phenomenon of light color shift of a light source caused by temperature rise and non-gathering of the light can be prevented, and the service life of the light source is prolonged. And the adjusting plate and the heat dissipation mechanism operate at the same time, so that the lighting assembly and the heat dissipation plate can be conveniently protected and stored during carrying.

Description

Technical Field

[0001] The invention relates to the technical field of searchlights for construction, in particular to a searchlight used for bridge construction. Background Art

[0002] Searchlights play a vital role in bridge construction. They have a powerful light source and a concave mirror that can focus light in a specific direction. They are used for long-distance lighting and searching, especially at night or in low-light environments. Their main function is to provide effective lighting to ensure construction safety and work efficiency. Bridge construction usually involves a large amount of heavy machinery and complex operations. Reasonable lighting can reduce the incidence of accidents and improve the accuracy of workers' operations.

[0003] When the existing searchlights for bridge construction are in use, the light outlet of the searchlight is usually exposed, or a simple round lampshade with a through hole is used to protect the light outlet. However, due to the need to emit light, the through hole of the lampshade is basically open, resulting in the internal lighting components being easily collided with external objects when the searchlight is carried, and the vertical heat dissipation and heat conduction plate arranged on the outside of the searchlight is also easily damaged by collision, making it impossible to quickly store and protect the heat dissipation and heat conduction plate and the lighting components. For this reason, we propose a searchlight for bridge construction. Summary of the Invention

[0004] The object of the present invention is to provide a searchlight for bridge construction to solve the problems raised by the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a searchlight for bridge construction, comprising a cross frame fixed to the upper end of a support frame assembly, a lamp tube for fixing the lighting assembly being mounted at both ends of the cross frame via a pin assembly, and a protective cover for protecting the lighting assembly being bolted to the outer side of one end of the lamp tube;

[0006] A toothed disc is fixed on the side of the rotating ring opposite to the fixed disc, which drives the adjustment plate to expand or contract. A hexagonal sliding groove is provided on the surface of the toothed disc, and a strip groove is provided on the inner surface of the protective cover near the adjustment plate for the circular slider to slide.

[0007] The circular slider and the square slider cooperate with each other and drive the adjustment plate to rotate away or retract to adjust the beam width. A heat dissipation mechanism is installed on one side of the fixed plate to assist the lamp tube in dissipating heat. The heat dissipation mechanism operates synchronously with the adjustment plate to protect and store the heat dissipation plate and lighting components.

[0008] Furthermore, the inner wall of the lamp tube located outside the lighting assembly is provided with an ash outlet for dropping ash, and the end of the adjustment plate close to the center of the circle is provided with a snap mechanism for installing a brush rod;

[0009] A fixed circular disc is installed on the inner side of the lamp tube near the protective cover, which can form a sliding sleeve with the rotating ring. The cross-sectional shape of the rotating ring is set to a T-shaped structure. A square slider is fixed on one side surface of the adjustment plate to form a sliding connection with the slide groove. The circular slider is located on the side surface of the adjustment plate away from the center of the circle.

[0010] Furthermore, four groups of symmetrically distributed fixing plates are fixed on the outer surface of the lamp tube at the tail, and the heat dissipation mechanism includes a fin-shaped heat dissipation plate arranged on the inner side of the fixing plate, which can dissipate heat and conduct heat. Both ends of the heat dissipation plate are fixedly connected to a rotating shaft that forms a movable sleeve with the fixing plate.

[0011] Furthermore, one end of the rotating shaft away from the heat dissipation plate is fixedly connected to a traction rod, the surface of the traction rod is provided with a traction groove for the round rod to slide, and the inner wall of the lamp tube is provided with an arc groove for the connecting rod to slide through.

[0012] Furthermore, an arc plate is connected between the connecting rod and the round rod, and one end of the connecting rod away from the arc plate is connected to the gear disc.

[0013] Furthermore, a motor for driving a gear to rotate is installed in the inner cavity of the protective cover located at the top of the lamp tube, and the gear is meshed with the gear disc.

[0014] Furthermore, a stopper with an arc-shaped structure is fixed on the inner wall of the lamp tube on one side of the ash discharge port, and an ash discharge door panel of matching size is provided on the inner side of the ash discharge port. A contraction groove for sliding and accommodating the ash discharge door panel is provided inside the lamp tube.

[0015] Furthermore, one end of the ash discharge door panel slides through the inner wall of the lamp tube and is connected to the gear disc, and an elastic sealing strip is pasted on the end of the ash discharge door panel that contacts the inner wall of the ash discharge port.

[0016] Furthermore, one end of the brush rod close to the surface of the lighting component is fixedly connected to a brush plate that can move with the adjustment plate and brush off dust. The snap mechanism includes a reset groove opened on the inner side of the adjustment plate to allow the card block to slide, and the surface of the card block is fixed with a shift block that extends through the inner wall of the adjustment plate.

[0017] Furthermore, a support spring for elastic reset of the card block is provided on the inner side of the reset groove, a docking port for inserting the brush rod is provided on the inner side of the adjustment plate, and a card slot forming a plug-in structure with the card block is provided on the inner side of the brush rod.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This searchlight used for bridge construction has a geared disc that drives the heat dissipation mechanism when the adjustment plate is open, preventing light color shift caused by temperature rise and reducing light loss. The adjustment plate and heat dissipation plate operate simultaneously. When the adjustment plate is closed, the heat dissipation plate folds and stores, reducing the overall space occupied by the searchlight when it is carried. It also serves as a protective component for the lamp housing, absorbing some of the damage caused by a collision.

[0020] 2. This searchlight used for bridge construction has a protective cover that cooperates with the gear disc, and a circular slider and a square slider that cooperate with each other to drive the adjustment plate to rotate away or retract. The adjustment plate can be opened or retracted to prevent excessive light dispersion and adjust the beam width to optimize the light concentration and directionality. The adjustment plate and protective cover protect the lighting component to prevent it from colliding with other objects when carried.

[0021] 3. The searchlight used for bridge construction can drive the brush plate to sweep the dust off the surface of the lighting component when the adjustment plate is expanded or retracted. At the same time, the brush plate can be disassembled and replaced through a snap mechanism, and the brush plate can be stored along with the adjustment plate. While being convenient to carry, it also reduces the light and dark contrast caused by uneven light, prevents uneven light spots and light color shift, and makes the overall lighting effect more comfortable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the support frame assembly of the present invention;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the protective cover of the present invention;

[0025] Figure 4 This is a schematic diagram of the three-dimensional structure of the lamp tube of the present invention;

[0026] Figure 5 This is a schematic diagram of the three-dimensional cross-sectional structure of the lamp tube of the present invention;

[0027] Figure 6 This is a schematic diagram of the three-dimensional structure of the ash discharge port of the present invention;

[0028] Figure 7 This is a schematic diagram of the three-dimensional structure of the connecting rod of the present invention;

[0029] Figure 8 This is a schematic diagram of the three-dimensional structure of the toothed disc of the present invention;

[0030] Figure 9 This is a schematic diagram of the three-dimensional structure of the rotating ring of the present invention;

[0031] Figure 10 This is a schematic diagram of the three-dimensional structure of the strip groove of the present invention;

[0032] Figure 11 This is a schematic diagram of the three-dimensional structure of the brush plate of the present invention;

[0033] Figure 12 Schematic diagram of the three-dimensional cross-sectional structure of the buckle mechanism of the present invention;

[0034] Figure 13 This is a schematic diagram of the three-dimensional structure of the shift block of the present invention;

[0035] Figure 14 Schematic diagram of the three-dimensional structure of the heat dissipation mechanism of the present invention;

[0036] Figure 15 This is a schematic diagram of the three-dimensional structure of the arc plate of the present invention;

[0037] Figure 16 It is a schematic diagram of the three-dimensional structure of the dust discharge door panel of the present invention.

[0038] In the figure: 1, support frame assembly; 2, cross frame; 3, lamp tube; 4, pin assembly; 5, protective cover; 6, arc plate; 7, strip groove; 8, heat dissipation mechanism; 801, traction groove; 802, traction rod; 803, rotating shaft; 804, round rod; 805, heat dissipation plate; 9, adjustment plate; 10, lighting assembly; 11, brush plate; 12, fixing plate; 13, connecting rod; 14, motor; 15, gear; 16, Toothed disc; 17. Slide groove; 18. Circular slider; 19. Arc groove; 20. Ash discharge port; 21. Stop block; 22. Fixed disc; 23. Ash discharge door panel; 24. Retraction groove; 25. Rotating ring; 26. Brush rod; 27. Square slider; 28. Buckle mechanism; 2801. Docking port; 2802. Block; 2803. Shift block; 2804. Support spring; 2805. Reset groove; 29. ​​Slot. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] See also Figures 1-6 The present invention provides a technical solution: a searchlight for bridge construction, comprising a cross frame 2 fixed to the upper end of a support frame assembly 1, a lamp tube 3 for fixing a lighting assembly 10 being installed at both ends of the cross frame 2 through a pin assembly 4, and a protective cover 5 for protecting the lighting assembly 10 being sleeved on the outer side of one end of the lamp tube 3 through a bolt.

[0041] During specific implementation, the lighting assembly 10 illuminates the bridge construction location. The triangular support frame assembly 1 can be placed on the ground to stably support the lamp tube 3. The protective cover 5 can store and protect the surface of the lighting assembly 10 when the lighting assembly 10 is not working, thereby avoiding collision with other objects when carried.

[0042] See also Figure 1-Figure 5 and Figure 7-10 A fixed disc 22 is installed on the inner side of the lamp tube 3 near the protective cover 5, which can form a sliding sleeve with the rotating ring 25. The cross-sectional shape of the rotating ring 25 is set to a T-shaped structure. A toothed disc 16 for driving the adjustment plate 9 to expand or contract is fixed on the side opposite to the fixed disc 22. The surface of the toothed disc 16 is provided with a hexagonal slide groove 17. A square slider 27 is fixed on one side of the adjustment plate 9 to form a sliding connection with the slide groove 17.

[0043] The inner surface of the protective cover 5 near the adjustment plate 9 is provided with a strip groove 7 for the circular slider 18 to slide. The gear disc 16 drives the slide groove 17 to rotate, and the slide groove 17 squeezes the square slider 27. At the same time, the circular slider 18 is squeezed by the strip groove 7, so that the circular slider 18 and the square slider 27 cooperate with each other and drive the adjustment plate 9 to rotate away or shrink closer. The circular slider 18 is located on the side surface of the adjustment plate 9 away from the center of the circle.

[0044] When in use, the gear 15 drives the toothed disc 16 to rotate, and the rotating ring 25 on one side of the toothed disc 16 slides in the fixed disc 22, which can stably guide the rotation of the toothed disc 16, and the toothed disc 16 drives the slide groove 17 to rotate, so that the slide groove 17 squeezes the square slider 27. At the same time, since the circular slider 18 is slidably connected to the bar groove 7, the protective cover 5 is in a stationary state, the toothed disc 16 is in a rotating state, the circular slider 18 is squeezed by the bar groove 7, so that the circular slider 18 slides along the bar groove 7, and the square slider 27 slides along the slide groove 17. The circular slider 18 and the square slider 27 cooperate with each other and drive the adjusting plate 9 to rotate away or close, so that the adjusting plate 9 can be opened or retracted, and the opening size of the protective cover 5 can be quickly adjusted and it is convenient to carry. On the basis of protecting the lighting assembly 10, it can also prevent the light from being too scattered, and the beam width can be adjusted, thereby optimizing the light gathering and directionality, so that the light can be more effectively irradiated to the target area and reduce the waste of light.

[0045] See also Figure 1-Figure 5 、 Figure 7 、 Figure 14 and Figure 15, the outer surface of the lamp tube 3 at the tail is fixed with four groups of symmetrically distributed fixing plates 12, and a heat dissipation mechanism 8 for assisting the lamp tube 3 in dissipating heat is installed on one side of the fixing plate 12. At the same time, it can serve as a protective component of the lamp housing, and can absorb part of the damage caused by the impact in the event of a collision. The heat dissipation mechanism 8 includes a fin-shaped heat dissipation plate 805 arranged on the inner side of the fixing plate 12. The heat dissipation plate 805 is made of aluminum alloy. When the heat dissipation plate 805 is in a vertical state, it can conduct heat and dissipate heat. Both ends of the heat dissipation plate 805 are fixedly connected to a rotating shaft 803 that forms a movable sleeve with the fixing plate 12. The end of the rotating shaft 803 away from the heat dissipation plate 805 is fixedly connected to a traction rod 802. The rotation of the traction rod 802 can cause the rotating shaft 803 to drive the heat dissipation plate 805 to rotate. The surface of the traction rod 802 is provided with a traction groove 801 for the sliding of the round rod 804, and the inner wall of the lamp tube 3 is provided with an arc groove 19 for the sliding of the connecting rod 13.

[0046] An arc plate 6 is connected between the connecting rod 13 and the round rod 804, and the end of the connecting rod 13 away from the arc plate 6 is connected to the gear plate 16. When the gear plate 16 rotates clockwise, the connecting rod 13 can drive the arc plate 6 to rotate, and the arc plate 6 then drives the round rod 804 to move in a circular arc trajectory and slide in the traction groove 801, so that one end of the traction rod 802 rotates around the rotating shaft 803.

[0047] When in use, while the adjustment plate 9 is rotated and opened, the toothed disc 16 drives the connecting rod 13 to slide in the arc-shaped track in the arc groove 19, and one end of the connecting rod 13 drives the arc plate 6 to slide in the arc-shaped track, so that the arc plate 6 drives the round rod 804 to slide in the arc-shaped track. At the same time, the round rod 804 slides in the traction groove 801, so that the round rod 804 squeezes the traction rod 802, so that one end of the traction rod 802 drives the rotating shaft 803 to rotate clockwise, and the rotating shaft 803 drives the heat sink 805 to rotate clockwise, so that the heat sink 805 originally close to the surface of the lamp tube 3 can be adjusted to a vertical state, thereby increasing the area of ​​the outer surface of the lamp tube 3, enhancing the heat conduction and convection heat dissipation effects, and accelerating the heat dissipation;

[0048] The heat dissipation mechanism 8 and the adjustment plate 9 are adjusted simultaneously, which can prevent the light color shift of the light source caused by temperature increase and light beam non-concentration, and the heat dissipation plate 805 is easy to fold and store, which can reduce the overall space occupied by the searchlight when carrying.

[0049] See also Figure 3 、 Figure 6 and Figure 7 A motor 14 for driving a gear 15 to rotate is installed in the inner cavity of the protective cover 5 located at the top of the lamp tube 3, and the gear 15 is meshed with a gear wheel 16.

[0050] During use, when the size of the opening of the protective cover 5 needs to be adjusted, the motor 14 can be used to drive the gear 15 to rotate, and the gear 15 can be meshed with the toothed disc 16, so that the gear 15 drives the toothed disc 16 to rotate, and then the toothed disc 16 drives the adjustment plate 9 to change its position, thereby adjusting the size of the opening of the protective cover 5.

[0051] See also Figure 4-Figure 6 and Figure 16 The lamp tube 3 is provided with an ash discharge port 20 for falling ash on the inner wall of the outer side of the lighting assembly 10, and an arc-shaped block 21 is fixed on the inner wall of the lamp tube 3 on one side of the ash discharge port 20. The inner side of the ash discharge port 20 is provided with an ash discharge door panel 23 of matching size, and the interior of the lamp tube 3 is provided with a contraction groove 24 for sliding and accommodating the ash discharge door panel 23. One end of the ash discharge door panel 23 slides through the inner wall of the lamp tube 3 and is connected to the toothed disc 16. An elastic sealing strip is pasted on the end of the ash discharge door panel 23 that contacts the inner wall of the ash discharge port 20. When the toothed disc 16 rotates clockwise, it drives the ash discharge door panel 23 to rotate clockwise in the contraction groove 24, so that the ash discharge port 20 is in an open state for discharging dust.

[0052] During use, while the toothed disc 16 drives the adjustment plate 9 to rotate and expand, the toothed disc 16 drives the ash discharge door panel 23 to slide, and the elastic sealing strip at one end of the ash discharge door panel 23 detaches from the inner wall of the ash discharge port 20. At the same time, the ash discharge door panel 23 slides into the shrinkage groove 24 for storage, so that the ash discharge port 20 is in an open state. The blocking block 21 can prevent dust from sliding along the inner wall to the fixed disc 22. The dust swept down by the fixed brush plate 11 will slide along the inner wall of the lamp tube 3 to the ash discharge port 20, and then be discharged from the ash discharge port 20, avoiding dust from staying in the lamp tube 3 for a long time, making it convenient to clean.

[0053] See also Figures 8-13 , the end of the adjustment plate 9 close to the center of the circle is provided with a snap mechanism 28 for installing the brush rod 26, and the end of the brush rod 26 close to the surface of the lighting assembly 10 is fixedly connected to a brush plate 11 that can move with the adjustment plate 9 and brush off dust. The material of the brush plate 11 is selected from polyester fiber. The snap mechanism 28 includes a reset groove 2805 provided on the inner side of the adjustment plate 9 for sliding the card block 2802. The surface of the card block 2802 is fixed with a dial block 2803 that extends through the inner wall of the adjustment plate 9. When the dial block 2803 is pulled toward one end, the dial block 2803 drives the card block 2802 to slide in the reset groove 2805;

[0054] The inner side of the reset groove 2805 is provided with a support spring 2804 for elastic reset of the block 2802, and the inner side of the adjustment plate 9 is provided with a docking port 2801 for inserting the brush rod 26. The inner side of the brush rod 26 is provided with a card slot 29 that forms a plug-in structure with the card block 2802. After the card block 2802 is disengaged from the card slot 29, the brush rod 26 is pushed toward the lighting assembly 10, so that the brush rod 26 can be disengaged from the docking port 2801, and then the brush plate 11 can be disassembled.

[0055] When in use, when the adjusting plate 9 is rotated and opened, it will drive the brush plate 11 to move from the center to the periphery on the surface of the lighting component 10, sweeping off the dust adhered to the surface of the lighting component 10. When the brush plate 11 needs to be replaced after a long time of use, it can be replaced by pulling the dial block 2803 toward one end. The dial block 2803 drives the card block 2802 to slide in the reset groove 2805, and the card block 2802 squeezes the support spring 2804, causing the support spring 2804 to contract, and one end of the card block 2802 disengages from the card slot 29 of the brush rod 26, and then pushes the brush rod 26 toward the lighting component 10, so that the brush rod 26 disengages from the docking port 2801, and then the brush plate 11 is removed from the adjusting plate 9, which is convenient and quick to replace, prevents the cleaning efficiency of the brush plate 11 from being reduced, affects the normal operation of the lighting component 10, reduces the light and dark contrast caused by uneven light, prevents the occurrence of uneven light spots, and makes the overall lighting effect more comfortable.

[0056] To sum up, when using the searchlight for bridge construction, the searchlight is placed at the construction site through the support frame assembly 1, and then the motor 14 is started to drive the gear 15 to rotate, so that the gear 15 drives the toothed disc 16 to rotate, and the toothed disc 16 drives the adjustment plate 9 to rotate and expand or rotate and retract through a series of sliding structures, which can quickly adjust the size of the opening of the protective cover 5. At the same time, the toothed disc 16 enables the connecting rod 13 to drive the heat dissipation mechanism 8 to operate, so that the heat dissipation plate 805 is in a vertical state, which can quickly conduct heat and dissipate heat, and the adjustment plate 9 drives the brush plate 11 to brush off the dust on the surface of the lighting assembly 10, so that the dust is discharged from the dust outlet 20. Finally, the brush plate 11 can be removed and replaced through the snap mechanism 28. This series of structures can prevent uneven light spots, light color deviation and light waste caused by non-concentration of light, high temperature of the lamp tube 3 and dust adhesion. The content not described in detail in this description belongs to the existing technology known to professional and technical personnel in this field.

Claims

1. A searchlight for bridge construction, characterized by: The invention comprises a horizontal frame (2) fixed to the upper end of a support frame assembly (1), a lamp tube (3) for fixing a lighting assembly (10) being mounted on both ends of the horizontal frame (2) via a pin assembly (4), and a protective cover (5) for protecting the lighting assembly (10) being sleeved on the outer side of one end of the lamp tube (3) via a bolt; A toothed disc (16) for driving the adjustment plate (9) to expand or contract is fixed on the side of the rotating ring (25) opposite to the fixed disc (22), and a sliding groove (17) with a hexagonal structure is provided on the surface of the toothed disc (16). A strip groove (7) for the circular slider (18) to slide is provided on the inner surface of the protective cover (5) near the adjustment plate (9); The circular slider (18) and the square slider (27) cooperate with each other and drive the adjustment plate (9) to rotate away or shrink closer to adjust the beam width. A heat dissipation mechanism (8) for assisting the lamp tube (3) in dissipating heat is installed on one side of the fixed plate (12). The heat dissipation mechanism (8) and the adjustment plate (9) operate synchronously to protect and store the heat dissipation plate (805) and the lighting assembly (10).

2. A searchlight for bridge construction according to claim 1, characterized in that: The lamp tube (3) is provided with an ash discharge port (20) for ash falling on the inner wall located outside the lighting assembly (10), and the end of the adjustment plate (9) close to the center of the circle is provided with a snap mechanism (28) for installing a brush rod (26); A fixed disc (22) is installed on the inner side of the lamp tube (3) close to the protective cover (5) and can be slidably connected with the rotating ring (25). The cross-sectional shape of the rotating ring (25) is set as a T-shaped structure. A square slider (27) is fixed on one side surface of the adjustment plate (9) and is slidably connected with the slide groove (17). The circular slider (18) is located on the side surface of the adjustment plate (9) away from the center of the circle.

3. The searchlight for bridge construction according to claim 1, characterized in that: Four groups of symmetrically distributed fixing plates (12) are fixed to the outer surface of the tail portion of the lamp tube (3); the heat dissipation mechanism (8) comprises a fin-shaped heat dissipation plate (805) disposed on the inner side of the fixing plate (12) and capable of dissipating and conducting heat; both ends of the heat dissipation plate (805) are fixedly connected to a rotating shaft (803) that forms a movable sleeve connection with the fixing plate (12).

4. The searchlight for bridge construction according to claim 3, characterized in that: One end of the rotating shaft (803) away from the heat dissipation plate (805) is fixedly connected to a traction rod (802), the surface of the traction rod (802) is provided with a traction groove (801) for the round rod (804) to slide, and the inner wall of the lamp tube (3) is provided with an arc groove (19) for the connecting rod (13) to slide through.

5. The searchlight for bridge construction according to claim 4, characterized in that: An arc plate (6) is connected between the connecting rod (13) and the round rod (804), and one end of the connecting rod (13) away from the arc plate (6) is connected to a toothed disc (16).

6. The searchlight for bridge construction according to claim 1, characterized in that: A motor (14) for driving a gear (15) to rotate is installed in the inner cavity of the protective cover (5) located at the top of the lamp tube (3), and the gear (15) is meshedly connected with the toothed disc (16).

7. The searchlight for bridge construction according to claim 1, characterized in that: A stopper (21) with an arc-shaped structure is fixed on the inner wall of the lamp tube (3) on one side of the ash discharge port (20); an ash discharge door plate (23) with a matching size is provided on the inner side of the ash discharge port (20); and a contraction groove (24) for the ash discharge door plate (23) to be slidably received is provided inside the lamp tube (3).

8. The searchlight for bridge construction according to claim 7, characterized in that: One end of the ash discharge door plate (23) slides through the inner wall of the lamp tube (3) and is connected to the toothed disc (16); an elastic sealing strip is pasted on the end of the ash discharge door plate (23) that contacts the inner wall of the ash discharge port (20).

9. The searchlight for bridge construction according to claim 2, characterized in that: One end of the brush rod (26) close to the surface of the lighting assembly (10) is fixedly connected to a brush plate (11) that can move with the adjustment plate (9) and brush off dust. The snap mechanism (28) includes a reset groove (2805) provided on the inner side of the adjustment plate (9) to enable the card block (2802) to slide. A shift block (2803) that penetrates and extends out of the inner wall of the adjustment plate (9) is fixed on the surface of the card block (2802).

10. The searchlight for bridge construction according to claim 9, characterized in that: A support spring (2804) for elastically resetting the clamping block (2802) is provided on the inner side of the reset groove (2805), a docking port (2801) for inserting the brush rod (26) is provided on the inner side of the adjustment plate (9), and a clamping slot (29) forming a plug-in structure with the clamping block (2802) is provided on the inner side of the brush rod (26).

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