Automatic spreading mechanism for asphalt spreader for bridge construction

Abstract

The invention relates to the field of pavement paving, in particular to an automatic spreading mechanism for an asphalt spreader for bridge construction, comprising a paving mechanism for guiding and paving asphalt; the spreading mechanism is used for conveying and spreading asphalt, the spread asphalt is conveyed by the spreading mechanism, the paving mechanism can guide the asphalt towards the two sides, and then the asphalt is flatly paved and subjected to hot pressing treatment; wherein the paving mechanism comprises a vehicle head, first steel connecting rods are symmetrically arranged on the two sides of the vehicle head, heating devices are fixedly installed at the ends, away from the vehicle head, of the first steel connecting rods, and the heating devices are used for heating conveyed asphalt; according to the automatic spreading mechanism for the asphalt spreader for bridge construction, when viscous asphalt is conveyed, blades arranged in the automatic spreading mechanism overcome magnetic force to stretch out under the action of asphalt thrust, and the material scraping area is increased; when thinner is conveyed, the scraper contracts under the action of magnetic force, and excessive scraping is avoided.

Description

Technical Field

[0001] This invention relates to the field of road paving technology, specifically to an automatic spreading mechanism for an asphalt spreader used in bridge construction. Background Technology

[0002] Asphalt spreaders are key equipment used for asphalt pavement laying in road construction. They are specifically responsible for the transportation and spreading of liquid asphalt or asphalt mixtures and play an important role in the construction of highways, bridges and other projects.

[0003] Different types of asphalt, such as modified asphalt and emulsified asphalt, have significant differences in viscosity and fluidity. Existing asphalt spreaders, when conveying viscous asphalt, result in slow conveying speeds and longer delivery times because the length of the conveying blades remains constant. Furthermore, changes in asphalt viscosity during delivery can easily lead to fluctuations in conveying pressure, causing instability in the asphalt delivery volume. Summary of the Invention

[0004] The present invention provides an automatic spreading mechanism for an asphalt spreader used in bridge construction, in order to solve the problems of slow asphalt delivery, long delivery time and unstable delivery mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic spreading mechanism for an asphalt spreader used in bridge construction, comprising a paving mechanism for guiding and spreading asphalt. The spreading mechanism is used for conveying and spreading asphalt. The paving mechanism guides the asphalt to both sides and then performs a flat hot pressing process. The paving mechanism includes a truck head, on both sides of which a No. 1 steel connecting rod is symmetrically arranged. A heating device is fixedly installed at the end of the No. 1 steel connecting rod away from the truck head. The heating device is used to heat the transported asphalt. A second steel connecting rod is fixedly installed on the outer end face of the vehicle head. A placement plate is fixedly connected to the end of the second steel connecting rod away from the vehicle head. The placement plate is used by staff to place miscellaneous items.

[0006] Preferably, a hydraulic cylinder is fixedly installed inside the heating device, a leveling mechanism is fixedly connected to the outside of the output end of the hydraulic cylinder, and an ironing board is fixedly installed at the bottom of the leveling mechanism. The leveling mechanism is used to adjust the height of the screed in real time and to control the flattening range of the asphalt.

[0007] Preferably, a central plate is fixedly connected to the center of the inner cavity of the heating device, and spiral augers are installed on both sides of the central plate through bearing seats, wherein the spiral augers are used for guiding and conveying asphalt. The vehicle head is equipped with a conveyor platform, through which asphalt is transported and then guided and conveyed to both sides by the auger.

[0008] Preferably, the spreading mechanism includes a frame body connected to the vehicle head, a shaft support fixedly installed on the top of the frame body, a hopper plate rotatably installed inside the shaft support via a fixed shaft, and a rotating plate hinged to the top of the hopper plate via a pin. The asphalt is contained to varying degrees by the deflection of the hopper plate.

[0009] Preferably, a walking frame is fixedly installed at the bottom of the vehicle frame, and a tracked walking device is installed on the outside of the walking frame; The outer side of the vehicle frame is fixedly connected to a first U-shaped rod and a second U-shaped rod, respectively. The end of the first U-shaped rod away from the vehicle frame is fixedly connected to a second plate, and the outer side of the second plate is fixedly connected to the second U-shaped rod.

[0010] Preferably, a first plate is fixedly connected to the center of the outer side of the second plate, and a hydraulic rod is fixedly connected to the top of the first plate. An outer connecting piece is hinged to the top of the hydraulic rod via a pin, and the top of the outer connecting piece is fixedly connected to the hopper plate. The hydraulic rod is used to control the space enclosed by the two hopper plates.

[0011] Preferably, a No. 4 plate is fixedly connected inside the frame body, a No. 1 elastic telescopic rod is fixedly installed inside the No. 4 plate, a guide plate is fixedly connected to the end of the No. 1 elastic telescopic rod away from the No. 4 plate, a No. 1 leak-proof patch is fixedly connected to the outside of the guide plate, and the end of the No. 1 leak-proof patch away from the guide plate is fixedly connected to the No. 2 plate.

[0012] Preferably, a second elastic telescopic rod is fixedly installed at the end of the inner cavity of the frame body away from the fourth plate, and an L-shaped plate is fixedly connected at the end of the second elastic telescopic rod away from the frame body, the L-shaped plate being inserted into the interior of the frame body; The transmission roller is rotatably mounted inside the frame body via bearings. A conveyor belt is connected to the outside of the transmission roller. A scraper conveyor is provided on the outside of the conveyor belt. A servo motor is connected to the outer end face of the transmission roller via a coupling. The housing of the servo motor is fixedly connected to the second U-shaped rod.

[0013] Preferably, grooves are provided on both sides of the vehicle frame, and an external strap is slidably adapted in the groove. A second leak-proof patch is squeezed and adapted on both the inner and outer sides of the external strap. The second leak-proof patch on the outer side is fixedly connected to the vehicle frame, while the second leak-proof patch on the inner side is fixedly connected to the second plate.

[0014] Preferably, the outer end face of the outer belt is provided with a groove, and a semi-ring plate is slidably adapted in the groove. A telescopic rod with an integrated hand and flashlight is fixedly connected to the inner wall of the semi-ring plate. A hexagonal block is fixedly connected to the end of the telescopic rod away from the semi-ring plate. The hexagonal block is rotatably mounted on the outer end face of the transmission roller through a bearing.

[0015] Preferably, both ends of the guide plate are symmetrically connected to a No. 3 plate, and an arc-shaped block is fixedly connected to the outer side of the No. 3 plate. The side of the arc-shaped block away from the No. 3 plate is squeezed and adapted to the semi-annular piece.

[0016] Preferably, the scraper conveyor includes scraper blades, which are fixedly connected to the outside of the conveyor belt. The scraper blades have grooves inside, and inner blades are slidably adapted in the grooves. The top of the inner blades is fixedly connected to the outer belt, and a first magnetic strip is fixedly connected to the bottom of the inner blades. A second magnetic strip is fixedly connected to the bottom of the inner cavity of the scraper blades.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The scraper blades of the scraper conveyor are equipped with sliding internal blades. The blade height can be adjusted according to the characteristics of asphalt such as viscosity and particle size through the magnetic attraction of the first and second magnetic strips, so as to ensure uniform asphalt transportation.

[0018] 2. When conveying viscous asphalt, the internal blades extend against the magnetic force under the thrust of the asphalt, increasing the scraping area; when conveying thin materials, they retract under the action of the magnetic force to avoid excessive scraping.

[0019] 3. By mounting a bearing on the outer end of the drive roller, the extension length of the inner blades is automatically adjusted, and the extension length of the inner blades is electrically locked.

[0020] 4. By extending the internal blades, the semi-annular blades expand outwards by the same amount and compress the arc-shaped block, ultimately allowing the No. 3 plate to fine-tune the position of the guide plate, thus avoiding interference between the extended internal blades and the guide plate.

[0021] 5. The combination of elastic telescopic rods and double leak-proof patches, along with the dynamic sealing of the guide plate, reduces asphalt leakage to below 0.1L / h, making it particularly suitable for high-altitude bridge operations and avoiding environmental pollution and safety hazards. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the external structure of an automatic spreading mechanism for an asphalt spreader used in bridge construction according to the present invention.

[0023] Figure 2 This is a schematic diagram of the paving mechanism of the present invention.

[0024] Figure 3 This is a cross-sectional structural diagram of the paving mechanism of the present invention.

[0025] Figure 4 This is a schematic diagram of the dispensing mechanism of the present invention.

[0026] Figure 5 This is a schematic diagram of the tracked walking device of the present invention.

[0027] Figure 6 This is a schematic diagram of the first longitudinal section of the spreading mechanism of the present invention.

[0028] Figure 7 This is a schematic diagram of the second longitudinal section of the spreading mechanism of the present invention.

[0029] Figure 8 This is a schematic diagram of the scraper conveyor of the present invention.

[0030] Figure 9 This is a cross-sectional schematic diagram of the spreading mechanism of the present invention.

[0031] Figure 10 This is a schematic diagram of the structure of the hexagonal block of the present invention.

[0032] Figure 11 This is a schematic diagram of the external strap structure of the present invention.

[0033] In the picture: 1. Paving mechanism; 11. Locomotive head; 12. No. 1 steel connecting rod; 13. Heating device; 14. No. 2 steel connecting rod; 15. Placement plate; 16. Hydraulic cylinder; 17. Leveling mechanism; 18. Ironing plate; 19. Center plate; 10. Spiral auger; 101. Conveying table; 2. Spreading mechanism; 21. Chassis body; 22. Axle support; 23. Hopper plate; 24. Rotating plate; 25. External connecting plate; 26. Hydraulic rod; 27. Plate No. 1; 28. Walking frame; 29. ​​Tracked walking device; 20. U-shaped rod No. 1; 201. U-shaped rod No. 2; 202. Plate No. 2; 203. Elastic telescopic rod No. 1; 204. Guide plate; 205. Leak-proof patch No. 1; 206. Transmission roller; 207. Conveyor belt; 208. Elastic telescopic rod No. 2; 209. L-shaped plate; 200. External connecting belt; 211. Leak-proof patch No. 2; 212. Hexagonal block; 213. Hand-held and electric integrated telescopic rod; 214. Semi-ring plate; 215. Servo motor; 216. Plate No. 3; 217. Arc block; 218. Plate No. 4; 2A. Scraper conveyor; 2A1, scraper blade; 2A2, internal blade; 2A3, first magnetic strip; 2A4, second magnetic strip. Detailed Implementation

[0034] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. 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.

[0035] Please see Figures 1 to 11 This invention provides a technical solution for achieving efficient asphalt transportation and precise paving through the coordinated operation of a paving mechanism and a spreading mechanism: Example 1: The paving mechanism 1 uses a truck head 11 as its core support. Heating devices 13 are symmetrically installed on both sides of the truck head 11 via steel connecting rods 12. These heating devices 13 have built-in electric heating wires, which can maintain the asphalt temperature within the optimal construction range of 160-180℃. A placement plate 15 is fixed to the front of the truck head 11 via steel connecting rods 14. This plate can be used to store tools such as thermometers and shovels during actual construction, improving operational convenience. Three hydraulic cylinders 16 are installed inside the heating device 13, one vertical and the other two horizontally symmetrically welded together. The piston rod of the horizontal hydraulic cylinder 16 is connected to a leveling mechanism 17, which uses a rack and pinion transmission structure. A 2-meter-long screed 18 is fixed to the bottom. The height of the screed 180-10cm can be adjusted by extending and retracting the vertical hydraulic cylinder 16. With the feedback from an angle sensor, it can compensate for ±3° slope deviation in real time. The vertical hydraulic cylinder 16 adjusts the height of the horizontal hydraulic cylinder 16. A center plate 19 is welded to the center of the inner cavity of the heating device 13, and augers 10 with a diameter of 20cm are installed on both sides through bearing seats. The auger blades are made of wear-resistant manganese steel, and the speed is adjustable from 30 to 60 r / min. The inside of the car head 11 is equipped with a conveyor platform 101 with an inclination angle of 15°. The platform surface is covered with a polytetrafluoroethylene anti-stick layer. The asphalt conveyed by the spreading mechanism 2 slides into the heating device 13 through the conveyor platform 101 and is then evenly distributed to both sides by the augers 10 to achieve a 4-6m wide paving coverage. The frame 21 of the spreading mechanism 2 is welded from rectangular steel pipes and rigidly connected to the cab 11 via flanges. A shaft support 22 is welded to the top of the frame 21, and two hopper plates 23 are mounted via 40mm diameter fixed shafts. The plates are made of 6mm thick wear-resistant steel plates, and a rotating plate 24 is hinged to the top via a pin, forming an openable hopper structure. A traveling frame 28 is welded to the bottom of the frame 21, and a tracked traveling device 29 is installed on the outside. The track width is 50cm, and the ground pressure is controlled within 0.08MPa, effectively protecting the bridge's foundation structure.

[0036] U-shaped rod 20 (No. 1) and U-shaped rod 201 (No. 2) are welded to both sides of the frame body 21, and the ends are fixed to plate 202 (No. 2) with bolts to form a triangular stable support. Plate 27 (No. 1) is welded to the center of the outer side of plate 202, and a hydraulic rod 26 is vertically installed on the top. The top of the hydraulic rod 26 is hinged to the hopper plate 23 through an external connecting piece 25. The extension and retraction of the hydraulic rod 26 allows the hopper plate 23 to be adjusted from 0-60°, and the volume can be infinitely varied within the range of 2-5m³ to meet the needs of different project volumes.

[0037] In Example 2, a No. 4 plate 218 is welded inside the frame body 21. Two sets of No. 1 elastic telescopic rods 203 are installed on the plate. The telescopic rods are chrome-plated piston rods with a diameter of 30mm, and an outer spring provides a preload of 500N. The ends are fixed to guide plates 204 by bolts. A 5mm thick heat-resistant rubber No. 1 leak-proof patch 205 is pasted on the outside of the guide plate 204. The other end of the patch is bonded and fixed to the No. 2 plate 202, forming the first line of sealing. Two sets of No. 2 elastic telescopic rods 208 are installed at the other end of the inner cavity of the frame body 21, and the ends are connected to L-shaped plates 209. The plates are inserted into rectangular grooves in the side wall of the frame body 21 and can slide elastically in the horizontal direction to effectively absorb the vibration and impact of the equipment during operation. Inside the frame body 21, two drive rollers 206 with a diameter of 10cm are installed through bearing seats. The surface is covered with a rubber anti-slip layer. A 5mm thick high-temperature resistant conveyor belt 207 is sleeved on the outside. Scraper conveyors 2A are fixed at 30cm intervals on the belt surface. The scraper blades 2A1 of the scraper conveyor 2A are made of 10mm thick steel plate, with T-shaped grooves inside. Sliding blades 2A2 are fitted inside, and neodymium iron boron magnet strips 2A3 are embedded at the bottom of the blades, forming a magnetic attraction with magnet strips 2A4 inside the scraper blades 2A1. The magnetic force can be adjusted from 10-50N by replacing different specifications of the magnet strips. When conveying viscous asphalt, the internal blades 2A2 extend against the magnetic force under the thrust of the asphalt, increasing the scraping area; when conveying thin materials, they retract under the magnetic force to avoid excessive scraping. The frame body 21 has 20cm wide slots on both sides, with a 3mm thick flexible outer strap 200 inside. The inner and outer sides of the strap are tightly pressed with a second leak-proof patch 211 made of fluororubber. The outer patch is bolted to the frame body 21, and the inner patch is bonded to the second plate 202 to form a second seal. The outer end face of the outer strap 200 has an annular groove to slide and fit a semi-annular piece 214. The inner wall of the piece is fixed with a hand-flash integrated telescopic rod 213 by bolts. The end of the push rod is connected to a hexagonal block 212, which is sleeved on the outer end of the transmission roller 206 through a bearing, forming an automatic adjustment of the extension length of the inner blade 2A2 and an electric locking of the extension length of the inner blade 2A2. The guide plate 204 has three plates 216 symmetrically welded to both ends, and an arc-shaped block 217 welded to the outer side, with the arc surface making contact with the surface of the semi-ring plate 214. When the conveyor belt 207 deviates from its course, the telescopic rod 213, which is integrated with a hand-held device, extends and retracts to move the semi-ring plate 214, and drives the guide plate 204 to make fine adjustments through the arc block 217, thereby correcting the position of the conveyor belt 207 in real time and ensuring conveying accuracy.

[0038] Supplement: By extending the internal blade 2A2, the semi-ring blade 214 expands outward by the same amount. The semi-ring blade 214 is made of soft steel ring material and compresses the arc block 217. Finally, the No. 3 plate 216 makes a fine adjustment to the position of the guide plate 204 to avoid interference between the extended internal blade 2A2 and the guide plate 204.

[0039] When the telescopic pole 213 is not powered on, the internal blade 2A2 can automatically adjust its extension length according to the viscosity of the asphalt. When powered on, the length of the internal blade 2A2 is limited and fixed. It can be electrically controlled and adjusted according to the amount of asphalt to be conveyed. When the amount of asphalt to be conveyed is small, the internal blade 2A2 can be retracted into the scraper blade 2A1. When the amount of asphalt to be conveyed is large, the internal blade 2A2 extends outward from the scraper blade 2A1.

[0040] Example 3: During curve construction, the speed difference between the two track walking devices 29 is adjusted by the control system, with the inner speed being 10-30% lower than the outer speed, to achieve smooth turning. At this time, the leveling mechanism 17 activates the curve compensation mode, and the inner hydraulic cylinder 16 shortens by 5-15mm more than the outer one, so that the screed 18 forms a corresponding slope to meet the superelevation requirements of the curve. The hydraulic rod 26 of the spreading mechanism 2 adopts differential control. The opening and closing angle of the inner hopper plate 23 is 5-10° smaller than that of the outer side, which reduces the supply of asphalt on the inner side. Combined with the fact that the rotational speed difference of the spiral auger 10 is 15% lower on the inner side than on the outer side, the asphalt quantity at the bend is accurately distributed.

[0041] In addition, the above embodiments contain structures not mentioned in the claims, which are all existing structures.

[0042] In use, the invention operates as follows: First, in the spreading mechanism 2, the frame 21 serves as the basic load-bearing structure. The top axle support 22 rotatably mounts the hopper plates 23 via a fixed shaft. The two hopper plates 23 are hinged to the rotating plate 24 via pins. During operation, the hydraulic rod 26 drives the hopper plates 23 to deflect via the external connecting piece 25, adjusting the size of the space enclosed by the frame 21, the conveying equipment, and the hopper plates 23 to handle different quantities of asphalt. The servo motor 215 drives the transmission roller 206 to rotate, driving the conveyor belt 207 and the outer scraper conveyor 2A. The scraper blades 2A1 of the scraper conveyor 2A have sliding internal blades 2A2. These blades, along with the magnetic attraction of magnetic strips 2A3 and 2A4, allow for adjustment of the blade height based on the asphalt viscosity, particle size, and other characteristics, ensuring uniform asphalt delivery. During the conveying process, the outer belts 200 on both sides of the frame 21 are tightly pressed against the second leak-proof patch 211. This, combined with the leak-proof structure formed by the first elastic telescopic rod 203, guide plate 204, and the first leak-proof patch 205, effectively prevents asphalt leakage. Simultaneously, the third plate 216 and arc-shaped block 217 at both ends of the guide plate 204 are pressed and fitted against the semi-ring piece 214. The semi-ring piece 214 is connected to the drive roller 206 via the integrated telescopic rod 213 and hexagonal block 212, ensuring stable and non-deviationist operation of the conveyor belt 207.

[0043] Additionally, activating the integrated telescopic rod 213 causes the semi-ring 214 to expand outwards by the same amount. The semi-ring 214 is made of soft steel ring material, which causes the outer strap 200 to expand outwards by the same amount as well, and stretches and compresses the two second leak-proof patches 211. The outer strap 200 is connected to the outer end face of the internal blade 2A2 to achieve the adjustment of the blade height.

[0044] Driven by the electric motor of the integrated telescopic rod 213, the semi-ring plate 214 expands outward by the same size and squeezes the arc block 217. The squeezed arc block 217 then moves the third plate 216 outward. The guide plate 204, which is connected to the other end of the third plate 216, moves away from the scraper conveyor 2A. Because the expansion of the semi-ring plate 214 causes the internal blades 2A2 to extend outward, the guide plate 204 moves outward synchronously to avoid interference and collision between the two, which would prevent the equipment from operating.

[0045] Asphalt delivered to the conveyor platform 101 inside the vehicle head 11 enters the heating device 13 of the paving mechanism 1. The spiral augers 10 on both sides of the central plate 19 inside the heating device 13 rotate at high speed, guiding the asphalt to both sides for paving. Simultaneously, the hydraulic cylinder 16 inside the heating device 13 drives the leveling mechanism 17 to adjust the height of the screed 18 in real time to adapt to changes in bridge road slope or different paving thickness requirements. The heating device 13 heats the screed 18, allowing it to be hot-pressed and laid flat with the asphalt at a suitable temperature, ensuring the smoothness and density of the paved layer. Furthermore, the traveling frame 28 and tracked traveling device 29 at the bottom of the vehicle frame 21 provide stable driving force to adapt to complex road conditions during bridge construction; the buffer structure composed of the second elastic telescopic rod 208 and the L-shaped plate 209 reduces the impact of equipment vibration on paving accuracy. Throughout the operation, the placement plate 15 allows workers to place tools and other miscellaneous items, improving construction convenience.

[0046] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made by those skilled in the art based on the above concepts without creative effort shall fall within the scope of protection of the present invention.

Claims

1. An automatic spreading mechanism for an asphalt spreader used in bridge construction, characterized in that, include: A paving mechanism used for guiding and leveling asphalt; The spreading mechanism is used for conveying and spreading asphalt. The paving mechanism guides the asphalt to both sides and then performs a flat hot pressing process. The paving mechanism includes a truck head, on both sides of which a No. 1 steel connecting rod is symmetrically arranged. A heating device is fixedly installed at the end of the No. 1 steel connecting rod away from the truck head. The heating device is used to heat the transported asphalt. A second steel connecting rod is fixedly installed on the outer end face of the vehicle head. A placement plate is fixedly connected to the end of the second steel connecting rod away from the vehicle head. The placement plate is used by staff to place miscellaneous items.

2. The automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 1, characterized in that: A hydraulic cylinder is fixedly installed inside the heating device, and a leveling mechanism is fixedly connected to the outside of the output end of the hydraulic cylinder. An ironing board is fixedly installed at the bottom of the leveling mechanism. The leveling mechanism is used to adjust the height of the screed in real time and to control the flattening range of the asphalt.

3. The automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 1, characterized in that: A central plate is fixedly connected to the center of the inner cavity of the heating device. Spiral augers are installed on both sides of the central plate through bearing seats. The spiral augers are used for guiding and conveying asphalt. The vehicle head is equipped with a conveyor platform, through which asphalt is transported and then guided and conveyed to both sides by the auger.

4. The automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 1, characterized in that: The spreading mechanism includes a frame body connected to the vehicle head. A shaft support is fixedly installed on the top of the frame body. A hopper plate is rotatably installed inside the shaft support via a fixed shaft. A rotating plate is hinged to the top of the hopper plate via a pin. The asphalt is contained to varying degrees by the deflection of the hopper plate.

5. The automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 4, characterized in that: A walking frame is fixedly installed at the bottom of the vehicle frame, and a tracked walking device is installed on the outside of the walking frame; The outer side of the vehicle frame is fixedly connected to a first U-shaped rod and a second U-shaped rod, respectively. The end of the first U-shaped rod away from the vehicle frame is fixedly connected to a second plate, and the outer side of the second plate is fixedly connected to the second U-shaped rod.

6. The automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 5, characterized in that: Plate 1 is fixedly connected to the center of the outer side of Plate 2. A hydraulic rod is fixedly connected to the top of Plate 1. An outer connecting piece is hinged to the top of the hydraulic rod via a pin. The top of the outer connecting piece is fixedly connected to the hopper plate. The hydraulic rod is used to control the space enclosed by the two hopper plates.

7. The automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 5, characterized in that: The frame body is internally fixedly connected to a No. 4 plate, and a No. 1 elastic telescopic rod is fixedly installed inside the No. 4 plate. A guide plate is fixedly connected to the end of the No. 1 elastic telescopic rod away from the No. 4 plate. A No. 1 leak-proof patch is fixedly connected to the outside of the guide plate. The end of the No. 1 leak-proof patch away from the guide plate is fixedly connected to the No. 2 plate.

8. The automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 7, characterized in that: A second elastic telescopic rod is fixedly installed at the end of the inner cavity of the vehicle frame away from the fourth plate, and an L-shaped plate is fixedly connected at the end of the second elastic telescopic rod away from the vehicle frame. The L-shaped plate is inserted into the interior of the vehicle frame. The transmission roller is rotatably mounted inside the frame body via bearings. A conveyor belt is connected to the outside of the transmission roller. A scraper conveyor is provided on the outside of the conveyor belt. A servo motor is connected to the outer end face of the transmission roller via a coupling. The housing of the servo motor is fixedly connected to the second U-shaped rod.

9. The automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 8, characterized in that: Both sides of the vehicle frame are provided with grooves, and external straps are slidably fitted in the grooves. Second leak-proof patches are squeezed and fitted on both the inner and outer sides of the external straps. The second leak-proof patch on the outer side is fixedly connected to the vehicle frame, while the second leak-proof patch on the inner side is fixedly connected to the second plate.

10. An automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 9, characterized in that: The outer end face of the outer belt is provided with a groove, and a semi-ring plate is slidably fitted in the groove. A telescopic rod with an integrated hand and flashlight is fixedly connected to the inner wall of the semi-ring plate. A hexagonal block is fixedly connected to the end of the telescopic rod away from the semi-ring plate. The hexagonal block is rotatably mounted on the outer end face of the transmission roller through a bearing.

11. The automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 10, characterized in that: Both ends of the guide plate are symmetrically connected to the No. 3 plate, and an arc-shaped block is fixedly connected to the outer side of the No. 3 plate. The side of the arc-shaped block away from the No. 3 plate is squeezed and adapted to the semi-annular piece.

12. The automatic spreading mechanism for an asphalt spreader used in bridge construction according to claim 9, characterized in that: The scraper conveyor includes scraper blades, which are fixedly connected to the outside of the conveyor belt. The scraper blades have grooves inside, and inner blades are slidably fitted inside the grooves. The top of the inner blades is fixedly connected to the outer belt, and a first magnetic strip is fixedly connected to the bottom of the inner blades. A second magnetic strip is fixedly connected to the bottom of the inner cavity of the scraper blades.

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