A lignin fiber adding device

Abstract

The utility model discloses a lignin fiber adding device belongs to bituminous mixture production technical field. The device is in view of prior art lignin fiber feeding path long, low efficiency, energy consumption higher problem, through the synergic design of tapering transition bin, butterfly valve and pipeline system, realizes the even feeding of fiber fast. Specifically include: the transition bin roof board and the inclined side plate form tapering cavity, and the discharge valve and the discharge pipe shorten the feeding path, the ventilation pipe is connected with the air -blower, and the air -flow intensity is controlled through the butterfly valve, and the feed pipe is cooperated with the branch pipe, and the proportion of fiber and airflow is dynamically regulated. The device can be installed in the asphalt mixing building hot stock bin externally or internally, and the feeding time is shortened, the energy consumption is reduced, and the maintenance is convenient, the environmental protection is high, the production efficiency and the quality of asphalt mastic chip macadam mixture are improved obviously, and it is suitable for road construction field.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of asphalt mixture production, and specifically designs a lignin fiber rapid adding device. BACKGROUND

[0002] In the field of asphalt mixture production, especially in the preparation of asphalt mastic stone chip mixture (SMA), lignin fiber as a key additive can significantly improve the crack resistance, durability and high temperature stability of the mixture. However, the existing lignin fiber adding technology has significant defects, which has become the core bottleneck restricting production efficiency.

[0003] At present, the industry generally uses external adding equipment, that is, the lignin fiber adding machine is installed outside the bottom of the asphalt mixing building. This design leads to a long fiber feeding path (usually more than 10 meters), and the fiber needs to be transported from the external equipment to the hot material bin through multiple conveying devices (such as screw conveyors or pneumatic conveying pipelines). This process has the following problems: 1. Long feeding time: the fiber needs to go through a complex path to enter the hot material bin, and the single feeding time increases by 30%-50%, which seriously slows down the production rhythm; 2. Energy waste: long-distance conveying needs to rely on high-power fans or motors, and the energy consumption increases by about 20%, and the efficiency is easily lost due to pipeline resistance; 3. Lack of uniformity: the fiber is prone to stratification or agglomeration during long-distance transportation, resulting in uneven distribution of fiber in the mixture and affecting the final pavement performance; 4. Space limitation and maintenance difficulty: the external equipment occupies ground space, and the pipeline system is complex, with high cleaning and troubleshooting cost.

[0004] In addition, the existing adding equipment mostly uses fixed flow valves, lacking dynamic adjustment function of air flow and material ratio. During feeding, blockage is easily caused by fluctuations in bin pressure or changes in fiber humidity, further exacerbating the low efficiency problem. And the feeding time needs to be synchronized with the mixing period. However, the traditional equipment is difficult to meet the above requirements, and an integrated and high-response speed solution is urgently needed.

[0005] In view of the above problems, some improved schemes try to integrate the fiber bin directly into the asphalt mixing building, but still have defects such as structural redundancy and inaccurate air flow control. Therefore, developing a rapid adding device that can shorten the feeding path, optimize the synergistic effect of air flow and material, and adapt to different installation scenarios, has become the key direction of industry technology upgrading. INVENTION CONTENTS

[0006] The purpose of this invention is to provide a rapid lignin fiber addition device to solve the problem mentioned in the background art of the long time required for existing lignin fiber addition machines, which affects the low output of asphalt mastic aggregate mixture produced by asphalt mixing plants.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A lignin fiber addition device is characterized in that it includes a transition chamber, which includes a top plate, a side plate, a discharge valve, and a discharge pipe. The lower part of the top plate is connected to the side plate, and the lower part of the side plate is connected to the discharge valve. The top plate, side plate, and discharge valve together form a hollow cavity. The top plate is fixedly connected to the top of the side plate, the lower end of the side plate is fixedly connected to the discharge valve, and the lower part of the discharge valve is connected to the discharge pipe. One end of the ventilation pipe is connected to the top plate, and the other end is connected to a blower. The side plate is connected to the feed pipe.

[0008] Furthermore, the side panels of the transition chamber are inclined, and the cross-section of the transition chamber gradually narrows from top to bottom.

[0009] Furthermore, the ventilation duct is equipped with a butterfly valve I.

[0010] Furthermore, a butterfly valve II is provided on the feed pipe.

[0011] Furthermore, the transition chamber is located outside the hot material chamber, and the discharge pipe extends into the hot material chamber.

[0012] Furthermore, the transition chamber is located inside the hot material silo, wherein the transition chamber is located at the top of the hot material silo, the side plate of the transition chamber is connected to the lower side of the top surface of the hot material silo, the ventilation pipe extends into the top surface of the hot material silo and communicates with the interior of the transition chamber, and the feed pipe extends into the side of the hot material silo and communicates with the interior of the transition chamber.

[0013] Furthermore, the discharge pipe is inclined, and the transition chamber is inclinedly connected to the hot material chamber through the discharge pipe.

[0014] Furthermore, the discharge pipe is arranged vertically.

[0015] Furthermore, a branch pipe is provided between the ventilation pipe and the feed pipe, the branch pipe connecting the ventilation pipe and the feed pipe, butterfly valve I is located upstream of the branch pipe, and butterfly valve II is located upstream of the branch pipe.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. Significantly Improved Feeding Efficiency: The tapered transition silo, combined with the inclined or vertical discharge pipe design, shortens the lignin fiber feeding path to less than 1 / 3 of that of traditional equipment. The lignin fiber can be temporarily stored in the transition silo and added during mixing, reducing the feeding time per batch and ensuring complete synchronization with the hot aggregate bin mixing cycle of the asphalt mixing plant, thus avoiding production interruptions. The linkage control of butterfly valves I and II with the blower increases the fiber conveying speed, achieving "instant use" and significantly improving the production efficiency of asphalt mastic aggregate mixtures.

[0017] 2. Significantly reduced energy consumption: The coordinated control of branch pipes and butterfly valves can dynamically adjust the airflow and material ratio, avoiding excessive air supply or fiber blockage, and further reducing energy waste.

[0018] 3. Enhanced fiber distribution uniformity: The thorough mixing of airflow and fibers in the transition chamber, combined with the guiding effect of the tapered structure on the material, ensures that the fibers enter the hot material hopper in a dispersed state, avoiding the fiber agglomeration problem commonly found in traditional equipment. Attached Figure Description

[0019] Fig. 1 This is a schematic diagram of Embodiment 1 of the present utility model; Fig. 2 This is a schematic diagram of Embodiment 2 of the present invention; In the diagram, 1-transition bin, 2-transition bin top plate, 3-transition bin side plate, 4-discharge valve, 5-discharge pipe, 6-ventilation pipe, 7-blower, 8-feed pipe, 9-butterfly valve I, 10-butterfly valve II, 11-branch pipe, 12-asphalt mixing plant, 13-hot aggregate bin. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0021] Example 1 like Figs. 1-2As shown, a lignin fiber adding device includes a transition chamber 1, which is located outside the hot material silo 13 and above the asphalt mixing plant 12. The lignin fiber is pre-transported into the transition chamber 1 to shorten the lignin fiber delivery path. The transition chamber 1 includes a top plate 2, a side plate 3, a discharge valve 4, and a discharge pipe 5. The side plate 3 is connected to the lower side of the top plate 2, and the discharge valve 4 is connected to the bottom of the side plate 3. The side plate 3 is inclined and forms a conical surface. The transition chamber 1 is in the shape of an inverted cone. The cross-section of the transition chamber 1 gradually narrows from top to bottom, so that the lignin fiber in the transition chamber 1 can fall along the inclined side plate 3 under the action of gravity. A discharge valve 4 is connected to the lower part of the side plate 3 of the transition chamber. The top plate 2, side plate 3, and discharge valve 4 together form a hollow cavity. A discharge pipe 5 is connected to the lower part of the discharge valve 4. The discharge pipe 5 extends obliquely into the hot aggregate bin 13. The transition chamber 1 is obliquely connected to the hot aggregate bin 13 through the discharge pipe 5, allowing lignin fibers to enter the hot aggregate bin 13 along the oblique discharge pipe 5. One end of the ventilation pipe 6 is connected to the top plate 2 of the transition chamber, and the other end of the ventilation pipe 6 is connected to a blower 7. A butterfly valve I9 ​​is ​​installed on the ventilation pipe 6. The opening of the butterfly valve I9 ​​can be adjusted according to the actual production needs. When it is necessary to add lignin fibers to the hot aggregate bin 13, the blower 7 is turned on to blow air into the transition chamber 1, blowing the lignin fibers into the hot aggregate bin 13 in a dispersed state, preventing the lignin fibers from agglomerating and reducing the quality of the asphalt mastic aggregate mixture. When the butterfly valve I9 ​​is ​​opened, the transition chamber 1 can also maintain a positive pressure state, allowing the lignin fibers to fall smoothly into the hot aggregate bin 13. A feed pipe 8 is connected to the side plate 3 of the transition chamber. Lignin fibers enter the transition chamber 1 through the feed pipe 8 via a screw conveyor or pneumatic conveying pipeline. A butterfly valve II 10 is installed on the feed pipe 8 to stop the feeding into the transition chamber 1.

[0022] In operation, turn on blower 7, adjust butterfly valve I9 ​​to 50% opening to create a positive pressure environment in transition chamber 1, open butterfly valve II10, and use a screw conveyor or pneumatic conveying pipeline to transport lignin fibers to transition chamber 1 through feed pipe 8, then close butterfly valve II10. When adding other materials to hot material silo 13, open discharge valve 4 at the bottom of transition chamber 1, and simultaneously turn on blower 7 and butterfly valve I9 ​​to spray lignin fibers into the mixing area of ​​hot material silo 13 in a dispersed state. After addition is complete, close butterfly valve I9, and after a 10-second delay, close butterfly valve II10 to ensure that there are no residual fibers in feed pipe 8, preventing blockage during the next feeding.

[0023] Example 2 A lignin fiber adding device includes a transition chamber 1 located within a hot material silo 13 and situated at the top of the silo. The transition chamber 1 comprises a top plate 2, side plates 3, a discharge valve 4, and a discharge pipe 5. The side plates 3 are connected to the lower side of the top plate 2, and the discharge valve 4 is connected to the bottom of the side plates 3. The top plate 2 can be replaced by the existing top plate of the hot material silo 13. The side plates 3 are welded obliquely to the top plate 2. The cross-section of the transition chamber 1 gradually narrows from top to bottom, allowing the lignin fibers within the transition chamber 1 to fall along the oblique side plates 3 under gravity. The discharge valve 4 is connected to the lower part of the side plates 3. The top plate 2, side plates 3, and discharge valve 4 together form a hollow cavity. The discharge pipe 5 is connected to the lower part of the discharge valve 4 and is vertically positioned to prevent other materials from falling onto the discharge pipe 5 during addition, thus affecting the accuracy of the dispensing. A ventilation pipe 6 is connected to one end of the top plate 2 of the transition chamber, and a blower 7 is connected to the other end of the ventilation pipe 6. A butterfly valve I 9 is installed on the ventilation pipe 6. A feed pipe 8 is connected to the side plate 3 of the transition chamber, and a butterfly valve II 10 is installed on the feed pipe 8. The side plate 3 of the transition chamber is connected to the lower side of the top surface of the hot material bin 13. The ventilation pipe 6 extends into the top surface of the hot material bin 13 and communicates with the interior of the transition chamber 1. The feed pipe 8 extends into the side of the hot material bin 13 and communicates with the interior of the transition chamber 1. A branch pipe 11 is provided between the ventilation pipe 6 and the feed pipe 8, and the branch pipe 11 connects the ventilation pipe 6 and the feed pipe 8. The butterfly valve I 9 is located upstream of the branch pipe 11, and the butterfly valve II 10 is located upstream of the branch pipe 11. The opening degree of the butterfly valve I 9 can be adjusted according to the actual production needs. When the butterfly valve II 10 is closed and the butterfly valve I 9 is open, the blower 7 can blow the lignin fiber remaining in the feed pipe 8 into the transition chamber 1, so that the amount of lignin fiber added is more precise.

[0024] During operation, simultaneously open butterfly valves I9 and II10 to transport the lignin fibers into the transition chamber 1. Then close butterfly valve II10. Blower 7 injects auxiliary airflow into feed pipe 8 through branch pipe 11. Airflow enters simultaneously through ventilation pipe 6 and feed pipe 8. The lignin fibers mix with the airflow in the transition chamber 1 to form a gas-solid mixture. Open the discharge valve 4 at the bottom of the transition chamber 1. The lignin fibers, after mixing with the airflow, form a gas-solid mixture and are injected into the mixing zone of the hot material chamber 13. The remaining lignin fibers in feed pipe 8 are blown into the transition chamber 1 and then added to the mixing zone of the hot material chamber 13. After addition is complete, close butterfly valve I9.

[0025] In Example 1, the transition chamber 1 is located outside the hot aggregate silo 13, which is suitable for the renovation of old asphalt mixing plants 12. In Example 2, the transition chamber 1 is located inside the hot aggregate silo 13, which is suitable for the integrated design of newly built asphalt mixing plants 12.

[0026] This invention, through structural innovation, provides a highly efficient, energy-saving, and reliable solution for asphalt mixture production. The device employs a tapered transition chamber design 1, combined with the synergistic effect of a pneumatic butterfly valve and pipeline system. This allows lignin fibers to be temporarily stored in the transition chamber and added during mixing, reducing the time required for each feeding cycle. This perfectly synchronizes with the mixing cycle of the hot aggregate bins in the asphalt mixing plant, preventing production interruptions. It successfully shortens the lignin fiber feeding time by 30%-50%, reduces energy consumption by 20%-30%, and significantly improves the uniformity of fiber distribution, fully meeting industry standards. Its flexible installation method is adaptable to different models of asphalt mixing plants 12, suitable for low-cost retrofitting of old equipment, and can also be integrated into newly built asphalt mixing plants 12 for integrated production.

Claims

1. A lignin fiber adding device, characterized in that, The transition chamber (1) includes a top plate (2), a side plate (3), a discharge valve (4), and a discharge pipe (5). The top plate (2) is connected to the side plate (3) at the bottom, and the side plate (3) is connected to the discharge valve (4) at the bottom. The top plate (2), side plate (3), and discharge valve (4) together form a hollow cavity. The top plate (2) is fixedly connected to the top of the side plate (3), the side plate (3) is fixedly connected to the bottom, and the discharge valve (4) is connected to the bottom. The discharge pipe (5) is connected to the bottom of the discharge valve (4). One end of the ventilation pipe (6) is connected to the top plate (2), and the other end of the ventilation pipe (6) is connected to a blower (7). The side plate (3) is connected to the feed pipe (8).

2. The lignin fiber adding device according to claim 1, characterized in that, The side plate (3) of the transition chamber is inclined, and the cross-section of the transition chamber (1) gradually narrows from top to bottom.

3. The lignin fiber adding device according to claim 2, characterized in that, The ventilation pipe (6) is equipped with a butterfly valve I (9).

4. The lignin fiber adding device according to claim 3, characterized in that, The feed pipe (8) is equipped with a butterfly valve II (10).

5. A lignin fiber adding device according to any one of claims 1-4, characterized in that, The transition chamber (1) is located outside the hot material chamber (13), and the discharge pipe (5) extends into the hot material chamber (13).

6. A lignin fiber adding device according to any one of claims 1-4, characterized in that, The transition chamber (1) is located inside the hot material silo (13). The transition chamber (1) is located at the top of the hot material silo (13). The side plate (3) of the transition chamber is connected to the lower side of the top surface of the hot material silo (13). The ventilation pipe (6) extends into the top surface of the hot material silo (13) and communicates with the interior of the transition chamber (1). The feed pipe (8) extends into the side of the hot material silo (13) and communicates with the interior of the transition chamber (1).

7. The lignin fiber adding device according to claim 5, characterized in that, The discharge pipe (5) is inclined, and the transition chamber (1) is inclinedly connected to the hot material chamber (13) through the discharge pipe (5).

8. The lignin fiber adding device according to claim 6, characterized in that, The discharge pipe (5) is set vertically.

9. A lignin fiber adding device according to claim 8, characterized in that, A branch pipe (11) is provided between the ventilation pipe (6) and the feed pipe (8). The branch pipe (11) connects the ventilation pipe (6) and the feed pipe (8). Butterfly valve I (9) is located upstream of the branch pipe (11), and butterfly valve II (10) is located upstream of the branch pipe (11).

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