Counter-flow integrated asphalt mixing plant

Abstract

This utility model belongs to the technical field of asphalt mixing plants, specifically a counter-current integrated asphalt mixing plant combining virgin and recycled materials. It includes a platform with an L-shaped structure, comprising horizontal and vertical arms connected perpendicularly to each other. A base is mounted on the top of the vertical arm, and a support is installed on the base. A mixing hopper is fixed to the top of the support, and a discharge port is located at the bottom of the mixing hopper. A receiving hopper is located directly below the discharge port, with its bottom supported above a conveyor belt. A collection tank is located on the horizontal arm, and a suction pipe is installed within the collection tank. The suction pipe connects to two parallel mixing tanks, and the bottom of the mixing tanks is connected to a storage tank via a discharge pipe. A recycling pipe is located at the top of the storage tank, with its outlet extending above the mixing hopper. This utility model integrates virgin and recycled material processing, achieving counter-current operation through the L-shaped platform structure. The finished product can be recycled back to the mixing hopper or output via the storage tank and recycling pipe, realizing continuous and efficient asphalt mixture production and recycling.

Description

Technical Field

[0001] This utility model belongs to the technical field of asphalt mixing plants, specifically relating to a counter-current integrated asphalt mixing plant. Background Technology

[0002] An asphalt mixing plant is a complete set of equipment for the mass production of asphalt concrete. With increasingly stringent environmental regulations and the promotion of recycled material technology, integrated mixing equipment capable of handling both virgin and recycled materials has become an industry trend. Traditional mixing plants often employ linear or rectangular layouts, with virgin material handling and recycled material systems set up independently, resulting in large footprints and redundant structures. The recycled material addition process requires additional lifting devices and conveying channels, increasing energy consumption and potentially causing cross-contamination of materials.

[0003] Recycled asphalt mixtures require precise control of the proportion of recycled aggregate and the amount of recycling agent added. Existing equipment relies on a separate metering system, with the recycling agent injected directly into the mixing tank through an independent pipeline. This easily leads to uneven mixing and incomplete reaction with the recycled aggregate, affecting the performance of the recycled mixture. During discharge, conventional mixing plants use a direct-fall discharge structure, which allows high-temperature materials to accumulate in the receiving hopper, causing blockages. Simultaneously, the free-fall impact of materials on the conveyor belt can cause aggregate segregation, affecting the uniformity of the finished product. The mixing hopper is subjected to the impact and friction of high-temperature aggregates over a long period, and the traditional manganese steel lining is prone to wear and cracking. Mainstream equipment in the industry uses a horizontal receiving hopper with a single-sloping baffle structure, resulting in uneven material distribution and uneven wear of the conveyor belt.

[0004] To address the aforementioned shortcomings, there is an urgent need to develop a counter-current integrated asphalt mixing plant that features space-efficient design, integrated recycling processes, and controllable unloading. Therefore, a counter-current integrated asphalt mixing plant is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a counter-current integrated asphalt mixing plant with original and recycled materials, which has the functions of space integration, precise recycling and blending, and anti-segregation during unloading. It solves the problems of redundant equipment layout, uneven mixing of recycling agents, high heat loss, and unloading blockage and segregation in the existing technology.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a counter-current integrated asphalt mixing plant, including a platform, the platform having an L-shaped structure, including a horizontal arm and a vertical arm connected perpendicularly to each other, a base being provided at the top of the vertical arm, a support being installed on the base, a mixing hopper being fixed at the top of the support, a discharge port being provided at the bottom of the mixing hopper, a discharge gate being hinged at the bottom of the discharge port, a receiving hopper being provided directly below the discharge port, the receiving hopper having a hollow cylindrical structure and being vertically connected, the bottom of the receiving hopper being mounted above a conveyor belt, the conveyor belt being driven by a drive motor, the side wall of the receiving hopper being fixedly connected to the conveyor belt frame, and a material distribution baffle being inclinedly provided inside the receiving hopper;

[0007] A collection pool is provided on the cross arm, and a material extraction pipe is installed in the collection pool. The material extraction pipe is connected to two parallel mixing tanks. A mixing motor is installed on the top of each mixing tank. The output shaft of the mixing motor extends into the tank and is connected to the mixing blades. The bottom of the mixing tank is connected to a storage tank through a discharge pipe. A regeneration pipe is provided on the top of the storage tank. The outlet of the regeneration pipe extends to the top of the mixing hopper.

[0008] Preferably, one side of the discharge gate is connected to a hydraulic cylinder via a linkage mechanism, and the hydraulic cylinder is fixed to the outer wall of the mixing hopper.

[0009] Preferably, the material distribution baffle has a V-shaped structure with an included angle of 90°-120° and an inclination angle of 30°-45° to the horizontal plane.

[0010] Preferably, the conveyor belt is a high-temperature resistant corrugated sidewall belt with a running speed of 0.5-2m / s, and the drive motor is a variable frequency motor.

[0011] Preferably, the extraction pipe is equipped with a flow meter and a solenoid valve, and the end of the extraction pipe is connected to a screw conveyor, the outlet of which leads to the top inlet of the two mixing tanks respectively.

[0012] Preferably, the inner wall of the mixing tank is provided with a heat-conducting oil jacket, a temperature sensor is installed on the side wall of the mixing tank, and the mixing blades are a double helical ribbon structure.

[0013] Preferably, a regenerant addition device is connected in series on the regeneration pipe, and the regenerant addition device includes a metering pump and a storage tank.

[0014] Preferably, the mixing hopper is equipped with a vibrator on its side wall and the inner wall of the mixing hopper is lined with a wear-resistant ceramic layer.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0016] 1. This utility model integrates the processing of virgin and recycled materials. It achieves counter-current operation through an L-shaped platform structure. The finished product can be recycled back to the mixing hopper or output through the storage tank and recycling pipe, realizing continuous and efficient production and recycling of asphalt mixture.

[0017] 2. This utility model has the functions of space integration, precise regeneration and blending, and anti-segregation during unloading, which solves the problems of redundant equipment layout, uneven mixing of regenerant, high heat loss, and material blockage and segregation during unloading in the prior art. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of a counter-current integrated asphalt mixing plant based on original and recycled materials, according to one embodiment.

[0020] In each diagram, 1. Platform, 2. Base, 3. Support, 4. Mixing hopper, 5. Discharge port, 6. Discharge gate, 7. Hydraulic cylinder, 8. Receiving hopper, 9. Distributing baffle, 10. Collection pool, 11. Extraction pipe, 12. Mixing tank, 13. Mixing motor, 14. Mixing blade, 15. Discharge pipe, 16. Storage tank, 17. Regeneration pipe, 18. Regeneration agent addition device, 19. Conveyor belt, 20. Drive motor. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1, as Figure 1 As shown, a counter-current integrated asphalt mixing plant includes a platform 1, which has an L-shaped structure and includes horizontal and vertical arms that are perpendicularly connected to each other. The horizontal and vertical arms of the platform 1 adopt a box beam welded structure and are equipped with internal reinforcing ribs to improve torsional stiffness. The L-shaped design reduces the floor space and eliminates cross-contamination from material backflow.

[0024] A base 2, made of concrete, is mounted on the top of the vertical arm to effectively lower the center of gravity of the equipment. A bracket 3 is installed on the base 2 for support and fixation. A mixing hopper 4 is fixed to the top of the bracket 3. The mixing hopper 4 receives the premixed regenerant and the virgin material for final mixing. A pneumatic sealing cover (not shown in the figure) is installed on the top to prevent dust from overflowing. A discharge port 5 is located at the bottom of the mixing hopper 4. A discharge door 6 is hinged to the bottom of the discharge port 5. The discharge door 6 adopts an eccentric hinge design, with the hinge point offset from the center of gravity by 10-15mm. Gravity self-locking enhances the sealing performance. A high-temperature resistant silicone sealing strip is embedded on the edge of the discharge door 6 to prevent material leakage. A receiving hopper 8 is located directly below the discharge port 5. The receiving hopper 8 is a hollow cylindrical structure that runs vertically through the material. The bottom of the receiving hopper 8 is mounted above the conveyor belt 19. The top of the receiving hopper 8 has a flared buffer section with a flare angle of 20° to reduce the impact energy of the material. The bottom of the receiving hopper 8 is floatingly connected to the frame of the conveyor belt 19 using bolts for fixing and springs for shock absorption. The conveyor belt 19 is driven by a drive motor 20. The side wall of the receiving hopper 8 is fixedly connected to the frame of the conveyor belt 19. An inclined material distribution baffle 9 is installed inside the receiving hopper 8 to evenly distribute the material to both sides of the conveyor belt 19, eliminating central accumulation.

[0025] A collection tank 10 is provided on the cross arm. The collection tank 10 temporarily stores virgin aggregates such as crushed stone, sand, and recycled asphalt (RAP) to achieve premixing and buffer feeding. The bottom of the collection tank 10 has a double-conical structure with an inclination angle of ≥45° to avoid aggregate accumulation. A material extraction pipe 11 is installed inside the collection tank 10, which is connected to two parallel mixing tanks 12. The material extraction pipe 11 quantitatively delivers the material from the collection tank 10 to the mixing tanks 12, supporting simultaneous feeding from both tanks. A mixing motor 13 is installed on the top of each mixing tank 12. The output shaft of the mixing motor 13 extends into the tank and is connected to the mixing blades 14. The mixing blades 14 shear and convectively mix the aggregate and asphalt. The mixing motor 13 drives the mixing blades 14 to achieve efficient mixing and heat exchange of materials. The mixing motor 13 is a dual-speed motor: high speed crushes agglomerated materials, and low speed promotes asphalt coating. The output shaft of the mixing motor 13 is sealed to prevent asphalt from seeping into the bearings.

[0026] The bottom of the mixing tank 12 is connected to the storage tank 16 via a discharge pipe 15. The discharge pipe 15 conveys the mixed material to the storage tank 16, which temporarily stores the finished mixture and serves as a recycling hub. The top of the storage tank 16 is equipped with a regeneration pipe 17, the outlet of which extends above the mixing hopper 4. The regeneration pipe 17 conveys the mixture from the storage tank 16 to the mixing hopper 4 for secondary regeneration.

[0027] The specific design of the aforementioned key components will be discussed in detail below:

[0028] The discharge gate 6 is connected to a hydraulic cylinder 7 via a linkage mechanism on one side, and the hydraulic cylinder 7 is fixed to the outer wall of the mixing hopper 4. The hydraulic cylinder 7 amplifies its stroke through a four-bar linkage mechanism to achieve rapid opening and closing. The hydraulic circuit of the hydraulic cylinder 7 is preferably equipped with an accumulator (not shown in the figure), which can be manually opened for emergency use in case of power failure.

[0029] The material distribution baffle 9 has a V-shaped structure with an included angle of 90°-120° and an inclination angle of 30°-45° to the horizontal plane. The material distribution baffle 9 adopts a double steel plate sandwich structure, with ceramic cotton filling the middle for heat insulation. The included angle is preferably 105° and the inclination angle is 38°. After the material impacts the baffle, it slides down along the two wings. Due to the Coriolis effect, a reverse velocity component is generated, realizing the secondary homogenization of aggregate and asphalt.

[0030] The conveyor belt 19 is a high-temperature resistant corrugated sidewall belt with a running speed of 0.5-2m / s. The high-temperature resistant corrugated sidewall belt substrate is an aramid fiber core layer coated with a fluororubber coating and has transverse corrugations with a height of 60mm and a spacing of 150mm. The drive motor 20 is a variable frequency motor with variable frequency motor control logic. For high-temperature viscous materials, the speed is 0.5m / s to reduce segregation, and for conventional materials, the speed is 1.5m / s to improve efficiency.

[0031] The extraction pipe 11 is equipped with a flow meter and a solenoid valve. A screw conveyor is connected to the end of the extraction pipe 11, and the outlet of the screw conveyor leads to the top inlet of each of the two mixing tanks 12. The flow meter monitors the aggregate mass flow rate in real time, providing a data basis for balanced feeding between the two tanks. A Coriolis force sensor, not a traditional vortex type, is used to directly measure the mass flow rate. The solenoid valve dynamically adjusts the material flow rate to each mixing tank 12 according to the formula ratio. The screw conveyor solves the problem of bridging and clogging of sticky and wet materials in the pipe, and distributes the material evenly to the two mixing tanks 12 through the dual outlets.

[0032] Preferably, the inner wall of the mixing tank 12 is provided with a heat transfer oil jacket, and a temperature sensor is installed on the side wall of the mixing tank 12. The stirring blades 14 have a double-helix ribbon structure with a gradually changing pitch design, denser at the top and sparser at the bottom, promoting axial movement of the material. The heat transfer oil jacket maintains the temperature of the material inside the tank, and the temperature sensor is arranged with three probes in the upper, middle, and lower layers. A PLC controller is also included. The PLC controller receives signals from the temperature sensor and flow meter. When the temperature inside the tank is <140℃, it automatically starts the heat transfer oil heating and dynamically adjusts the opening of the solenoid valve according to the flow meter data.

[0033] A regenerant addition device 18 is connected in series on the regeneration pipe 17. The regenerant addition device 18 includes a metering pump and a storage tank. The metering pump is a three-cylinder plunger pump with an accuracy of ±0.5%. The storage tank is equipped with an electric heating coil to maintain the fluidity of the regenerant. The regenerant injection point is 0.8m away from the top cover of the mixing hopper 4, leaving space for the reaction between the old material and the regenerant. The regenerant is atomized and sprayed into the space above the mixing hopper 4 through the regeneration pipe 17 to achieve pre-wetting of the old material.

[0034] The mixing hopper 4 is equipped with vibrators on its side walls. The vibrators are symmetrically arranged on both sides of the cone of the mixing hopper 4. They adopt a high-frequency micro-vibration of 50Hz and an amplitude of 0.5mm. The inner wall of the mixing hopper 4 is lined with a wear-resistant ceramic layer. The wear-resistant ceramic layer of the inner wall of the mixing hopper 4 adopts a dovetail groove inlay process with a thickness of 8-12mm. The service life of the ceramic lining is better than that of the manganese steel of traditional equipment.

[0035] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A counter-current integrated asphalt mixing plant combining raw and recycled materials, comprising a platform, characterized in that, The platform has an L-shaped structure, including horizontal arms and vertical arms that are perpendicularly connected to each other. A base is provided at the top of the vertical arm, and a bracket is installed on the base. A mixing hopper is fixed at the top of the bracket. A discharge port is provided at the bottom of the mixing hopper. A discharge gate is hinged at the bottom of the discharge port. A receiving hopper is provided directly below the discharge port. The receiving hopper has a hollow cylindrical structure and is open from top to bottom. The bottom of the receiving hopper is mounted above the conveyor belt. The conveyor belt is driven by a drive motor. The side wall of the receiving hopper is fixedly connected to the conveyor belt frame. A material distribution baffle is inclinedly provided inside the receiving hopper. A collection pool is provided on the cross arm, and a material extraction pipe is installed in the collection pool. The material extraction pipe is connected to two parallel mixing tanks. A mixing motor is installed on the top of each mixing tank. The output shaft of the mixing motor extends into the tank and is connected to the mixing blades. The bottom of the mixing tank is connected to a storage tank through a discharge pipe. A regeneration pipe is provided on the top of the storage tank. The outlet of the regeneration pipe extends to the top of the mixing hopper.

2. The counter-current integrated asphalt mixing plant based on original and recycled materials according to claim 1, characterized in that, The discharge gate is connected to a hydraulic cylinder via a linkage mechanism on one side, and the hydraulic cylinder is fixed to the outer wall of the mixing hopper.

3. The counter-current integrated asphalt mixing plant based on original and recycled materials according to claim 1, characterized in that, The material distribution baffle has a V-shaped structure with an included angle of 90°-120° and an inclination angle of 30°-45° to the horizontal plane.

4. The counter-current integrated asphalt mixing plant based on original and recycled materials according to claim 1, characterized in that, The conveyor belt is a high-temperature resistant corrugated sidewall belt with a running speed of 0.5-2m / s, and the drive motor is a variable frequency motor.

5. The counter-current integrated asphalt mixing plant based on original and recycled materials according to claim 1, characterized in that, The extraction pipe is equipped with a flow meter and a solenoid valve. The end of the extraction pipe is connected to a screw conveyor, and the outlet of the screw conveyor leads to the top inlet of the two mixing tanks respectively.

6. The counter-current integrated asphalt mixing plant based on original and recycled materials according to claim 1, characterized in that, The inner wall of the mixing tank is provided with a heat-conducting oil jacket, a temperature sensor is installed on the side wall of the mixing tank, and the stirring blades are a double helical ribbon structure.

7. The counter-current integrated asphalt mixing plant based on original and recycled materials according to claim 1, characterized in that, A regenerant addition device is connected in series on the regeneration pipe. The regenerant addition device includes a metering pump and a storage tank.

8. The counter-flow, primary regen self-contained asphalt mixture plant of claim 1 wherein, The mixing hopper is equipped with a vibrator on its side wall and the inner wall of the mixing hopper is lined with a wear-resistant ceramic layer.

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