Asphalt plant light material addition metering system

Abstract

The utility model belongs to bituminous mixture production equipment technical field, especially relates to a kind of light substance adding metering system of asphalt station. Including storage hopper, storage hopper is connected with material conveying device, material transition hopper, screw conveyor, metering scale in proper order, and is installed with arch breaking device on material transition hopper, and storage hopper discharge end is installed with feeder, and the discharge end of metering scale is installed with butterfly valve, and butterfly valve is connected with chute;Arch breaking device includes: the upper push cylinder and lower push cylinder installed on the outer wall of material transition hopper, and the output end of upper push cylinder and lower push cylinder respectively fixed with upper push plate and lower push plate after penetrating material transition hopper.The utility model increases material transition hopper above metering scale, and then feed to metering scale by screw conveyor, to solve the problem of uneven discharge of air supply mode, improve the measurement accuracy.

Description

Technical Field

[0001] This utility model belongs to the technical field of asphalt mixture production equipment, and in particular relates to a light material addition metering system for asphalt plants. Background Technology

[0002] In the production of asphalt mixtures, lightweight materials such as fibers and rubber need to be precisely added to the mixing unit to improve asphalt performance. Traditional addition systems typically place the metering hopper on the ground, and after metering, the material is transported long distances to the mixing unit by air power. This method has significant drawbacks: First, the pneumatic conveying method results in uneven material output, with varying amounts, making precise control during metering difficult; second, the pneumatic conveying process is time-consuming, slowing down the overall production cycle and reducing efficiency; finally, the system is prone to clogging, and operation and maintenance are complex. For example, if the pneumatic conveying system is immediately shut off after the metering hopper reaches the target weight, material will remain in the hose, leading to high resistance and easy clogging during subsequent pneumatic conveying.

[0003] Therefore, there is an urgent need in this field for a light substance addition metering system that can achieve accurate measurement, rapid addition, and stable and reliable operation. Summary of the Invention

[0004] The purpose of this invention is to provide a metering system for adding light materials at asphalt plants, in order to solve the problems existing in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A light material addition metering system for asphalt plants includes a storage hopper, which is sequentially connected to a material conveying device, a material transition hopper, a screw conveyor, and a metering scale. An arch-breaking device is installed on the material transition hopper, a feeder is installed at the discharge end of the storage hopper, and a butterfly valve is installed at the discharge end of the metering scale. The butterfly valve is connected to a chute. The arch-breaking device includes: The upper and lower cylinders are installed on the outer wall of the material transfer hopper. The output ends of the upper and lower cylinders pass through the material transfer hopper and are respectively fixed with an upper push plate and a lower push plate.

[0006] Furthermore, the material conveying device is a pneumatic conveying system, and the output end of the pneumatic conveying system is connected to the feed end of the material transfer hopper via a flexible hose.

[0007] Furthermore, the upper part of the material transition hopper is square, and the lower part is bucket-shaped, with the bucket-shaped part of the material transition hopper connected to the screw conveyor.

[0008] Furthermore, there are at least two downward-pushing cylinders, which are symmetrically distributed on both sides of the square part of the material transition hopper. The output end of the downward-pushing cylinders on the same side is connected to a downward-pushing plate. The pushing direction of the downward-pushing cylinders is parallel to the inner wall of the hopper part, and the downward-pushing plate is perpendicular to the inner wall of the hopper part, which is used to push the material downward.

[0009] Furthermore, there are at least two upward-pushing cylinders, which are symmetrically distributed on both sides of the material transition hopper. The output ends of the upward-pushing cylinders on the same side are connected to an upward-pushing plate. The pushing direction of the upward-pushing cylinders is perpendicular to the inner wall of the material transition hopper, and is used to push the arched material upwards.

[0010] Furthermore, a level gauge is installed on the upper part of the square section of the material transfer hopper.

[0011] Furthermore, the screw conveyor is a variable pitch screw conveyor.

[0012] This utility model has the following beneficial effects: 1. This utility model adds a material transition hopper above the weighing scale, and then feeds the material to the weighing scale through a screw conveyor, thereby solving the problem of uneven material discharge in the pneumatic conveying method and improving the weighing accuracy.

[0013] 2. The bidirectional arch-breaking device, composed of an upper and lower cylinder, uses a mechanical arch-breaking method of "one push and one push, upper and lower combination" to exert direct and powerful force, which can completely solve the bridging and blockage problems caused by the looseness and stickiness of light materials, and ensure the continuity of material supply.

[0014] 3. When metering is completed, the pneumatic conveying system does not need to be shut down immediately. The feeder in the storage hopper can be shut down first, and then the material in the hose can be fed into the material transfer hopper to avoid material clogging the hose.

[0015] 4. Materials can be pre-fed into the material transition hopper. When metering is required, the material can be fed directly through the material transition hopper. Combined with the bidirectional arch-breaking device, it prevents materials from arching easily due to prolonged residence, thereby achieving rapid metering and feeding, effectively shortening the mixing cycle and improving production efficiency.

[0016] 5. By monitoring the material position through the level gauge and linking it with actuators such as cylinders, screw conveyors, and butterfly valves, fully automated control can be achieved. The operation is simple and reduces labor costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of the material transfer hopper of this utility model.

[0019] The components include: 1. Storage hopper; 2. Material conveying device; 3. Material transfer hopper; 4. Screw conveyor; 5. Measuring scale; 6. Butterfly valve; 7. Chute; 8. Upward push cylinder; 9. Upward push plate; 10. Downward push cylinder; 11. Downward push plate; 12. Level gauge; 13. Hose; 14. Feeder. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the scope of the utility model.

[0021] like Figure 1-2 As shown, an asphalt mixing plant light material addition metering system comprises a storage hopper 1, a material conveying device 2, a material transition hopper 3, a screw conveyor 4, a metering scale 5, a butterfly valve 6, and a chute 7. The storage hopper 1 and the material conveying device 2 are installed on the ground, while the material transition hopper 3, the screw conveyor 4, and the metering scale 5 are installed from top to bottom on the asphalt mixing plant.

[0022] The material conveying device 2 is a pneumatic conveying system. The discharge end of the storage hopper 1 is connected to its inlet through the feeder 14. The discharge end of the material conveying device 2 is connected to the inlet at the top of the material transition hopper 3 through a flexible conveying hose 13.

[0023] The material transfer hopper 3 consists of an upper square section and a lower hopper-shaped section. A level gauge 12 is installed on the upper part of the square section to monitor the material position inside the hopper. The discharge port at the bottom of the hopper-shaped section is connected to the feed end of the screw conveyor 4. The screw conveyor 4 is preferably a variable pitch design, meaning the pitch gradually changes from the feed end to the discharge end, which effectively prevents blockage of light materials during conveying and ensures uniform and stable feeding. The discharge end of the screw conveyor 4 is connected to the feed port of the weighing scale 5. In this embodiment, the square section of the material transfer hopper 3 has a rectangular cross-section.

[0024] The weighing scale 5 is existing technology, typically a round bucket-shaped container fixed to the asphalt mixing tower via a load-bearing sensor; its specific structure will not be described in detail here. A butterfly valve 6 is installed at the discharge port of the weighing scale 5, and a chute 7 is connected below the butterfly valve 6. The outlet of the chute 7 is directly aligned with the feeding port of the asphalt mixing host.

[0025] The arch-breaking device includes an upper push cylinder 8 and a lower push cylinder 10.

[0026] Downward-pushing cylinders 10: There are at least two, symmetrically installed on the outer walls of both sides of the square portion of the material transfer hopper 3. The output ends of the downward-pushing cylinders 10 on the same side are connected to a downward-pushing plate 11. The pushing direction of the downward-pushing cylinders 10 is parallel to the inner wall of the hopper-shaped portion, so that the downward-pushing plate 11 can move downward along the hopper wall, forcibly pushing the material adhering to the wall surface off. In this embodiment, the downward-pushing cylinders 10 are installed on both sides of the short side of the material transfer hopper 3, so only two downward-pushing cylinders 10 are needed.

[0027] At least two upward-pushing cylinders 8 are symmetrically installed on the outer walls of both sides of the hopper-shaped portion of the material transition hopper 3. The output ends of the upward-pushing cylinders 8 on the same side are connected to a larger upward-pushing plate 9. The pushing direction of the upward-pushing cylinders 8 is perpendicular to the inner wall of the hopper-shaped portion. When activated, the upward-pushing plate 9 directly impacts the material inward and upward, effectively breaking up any existing material arches. In this embodiment, the upward-pushing cylinders 8 are installed on both sides of the long side of the material transition hopper 3. Considering the relatively high resistance, four upward-pushing cylinders 8 are required.

[0028] The working principle of this utility model is as follows: During operation, the pneumatic conveying system (material conveying device 2) transports light materials from the storage hopper 1 to the material transition hopper 3 for temporary storage. The level gauge 12 controls the feeding process. When the mixing host needs to add material, the control system starts the screw conveyor 4, stably conveying the material from the transition hopper 3 to the weighing scale 5 for precise weighing. After the preset weight is reached, the screw conveyor 4 stops. Subsequently, the butterfly valve 6 at the bottom of the weighing scale 5 quickly opens, and the material is fed into the main unit through the chute 7 under gravity.

[0029] Throughout the process, if the system detects obstructed material flow (such as the material level in the material transfer hopper 3 remaining unchanged for an extended period and the value of the weighing scale 5 remaining unchanged for an extended period) or intermittently activates the arch-breaking device according to a preset program, the downward-pushing cylinder 10 actuates to remove material adhering to the wall surface; the upward-pushing cylinder 8 actuates to impact and break the arch points. This bidirectional, coordinated arch-breaking method ensures that the material can always smoothly enter the screw conveyor 4.

[0030] It should be noted that reliable sealing structures can be set at the positions where the output rods of the upper push cylinder 8 and the lower push cylinder 10 penetrate the wall of the material transition hopper 3. For example, a multi-layer sealing method can be formed by mounting flanges, dustproof rings, Y-type sealing rings, and flexible graphite packing to prevent dust from escaping and protect the cylinder rods. At the same time, it can also scrape off the material adhering to the surface of the output rods.

[0031] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention.

[0032] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A metering system for adding light materials at an asphalt plant, characterized in that, The device includes a storage hopper, which is sequentially connected to a material conveying device, a material transition hopper, a screw conveyor, and a weighing scale. An arch-breaking device is installed on the material transition hopper, a feeder is installed at the discharge end of the storage hopper, and a butterfly valve is installed at the discharge end of the weighing scale. The butterfly valve is connected to a chute. The arch-breaking device includes: The upper and lower cylinders are installed on the outer wall of the material transfer hopper. The output ends of the upper and lower cylinders pass through the material transfer hopper and are respectively fixed with an upper push plate and a lower push plate.

2. The asphalt plant light material addition metering system according to claim 1, characterized in that, The material conveying device is a pneumatic conveying system, and the output end of the pneumatic conveying system is connected to the feed end of the material transfer hopper via a flexible hose.

3. The asphalt plant lightweight material addition metering system according to claim 1, characterized in that, The upper part of the material transition hopper is square, and the lower part is bucket-shaped. The bucket-shaped part of the material transition hopper is connected to the screw conveyor.

4. The asphalt plant light material addition metering system according to claim 3, characterized in that, The number of push cylinders is at least two, and the push cylinders are symmetrically distributed on both sides of the square part of the material transition hopper. The output end of the push cylinders on the same side is connected to a push plate. The pushing direction of the push cylinder is parallel to the inner wall of the hopper, and the push plate is perpendicular to the inner wall of the hopper, which is used to push the material down.

5. The asphalt plant lightweight material addition metering system according to claim 3, characterized in that, The number of upward-pushing cylinders is at least two, and the upward-pushing cylinders are symmetrically distributed on both sides of the material transition hopper. The output end of the upward-pushing cylinders on the same side is connected to an upward-pushing plate. The pushing direction of the upward-pushing cylinders is perpendicular to the inner wall of the material transition hopper, and is used to push the arched material upwards.

6. The asphalt plant light material addition metering system according to claim 1, characterized in that, A level gauge is installed on the upper part of the square section of the material transfer hopper.

7. The asphalt plant light material addition metering system according to claim 1, characterized in that, The screw conveyor is a variable pitch screw conveyor.

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