Intermittent drying and stirring integrated device

Abstract

The intermittent drying and stirring integrated device comprises an outer cylinder, an inner cylinder, a driving mechanism and a combustor, the inner cylinder is coaxially arranged in the outer cylinder in a sleeved mode and can rotate forwards and reversely relative to the outer cylinder, and the inner cylinder is sequentially divided into a material guiding area, a material lifting area and a material discharging area in the axial direction. First material guiding blades are arranged on the inner wall of the material guiding area, second material guiding blades with the rotating direction opposite to that of the first material guiding blades are arranged on the inner wall of the material discharging area, material guiding drying and material discharging control over materials are achieved through forward and reverse rotation control over the inner barrel, and the drying temperature of the materials is guaranteed. No matter the inner cylinder rotates forwards or backwards, the stirring blade set on the outer wall of the inner cylinder can stir and mix the materials in the annular stirring cavity, the discharging door of the outer cylinder is independently controlled, stirring of the mixture and drying of the materials can be synchronously carried out but do not interfere with each other, the production quality of the asphalt mixture can be improved, and the production efficiency is improved. And the production efficiency of the equipment is also improved.

Description

Technical Field

[0001] This utility model relates to the field of asphalt mixture production technology, and more specifically to an intermittent drying and mixing integrated device. Background Technology

[0002] Asphalt mixtures are a core material in road construction, made by mixing asphalt, coarse aggregate, fine aggregate, mineral powder, etc., in a specific ratio. In the production of asphalt mixtures, integrating the drying of aggregates and the mixing of asphalt mixtures into one process is the most direct way to shorten the process and save energy.

[0003] For example, Chinese utility model patent application publication number CN2555277Y discloses a double-layer counter-current continuous mixing equipment for asphalt mixtures. It adopts a double-layer drum structure, with the burner and virgin material inlet located at opposite ends of the inner drum to form counter-current heating. The inner drum has lifting plates on its inner wall and stirring blades on its outer wall. The burner end of the inner drum has a discharge port, through which the heated virgin material enters the interlayer between the inner and outer drums, where it is continuously mixed with asphalt, recycled materials, and mineral powder added through the outer drum's feed port. This structure, to a certain extent, avoids direct contact between asphalt and flame, reducing the risk of asphalt aging and improving thermal efficiency.

[0004] However, the above patents are for continuous production equipment. The drying process of the material depends on the continuous flow of the material, and the drying time of the material cannot be effectively controlled. As a result, the material enters the jacket for stirring before reaching the drying temperature required by the process (especially the first batch of material for cold start drying), which affects the production quality of asphalt mixture. Utility Model Content

[0005] This utility model provides an intermittent drying and mixing integrated device, which aims to solve the problems that existing continuous mixing production equipment cannot effectively control the drying time of materials, resulting in the asphalt mixture temperature being difficult to meet the process requirements and affecting the production quality of asphalt mixture.

[0006] The present invention adopts the following technical solution:

[0007] An intermittent drying and stirring integrated device includes an outer cylinder, an inner cylinder, a drive mechanism, and a burner. The outer cylinder is fixedly mounted on a frame and has an openable and closable discharge gate at its bottom. The inner cylinder is coaxially sleeved inside the outer cylinder, forming an annular stirring chamber between the inner and outer cylinders. The drive mechanism is connected to the inner cylinder for driving it to rotate in the forward or reverse direction. The inner cylinder is divided into a guiding zone, a lifting zone, and a discharging zone along its axial direction. The guiding zone has a feed inlet at its front end and a first guiding blade installed on its inner wall. The discharging zone has a second guiding blade installed on its inner wall, with the guiding directions of the first and second guiding blades being opposite. The discharging zone has a discharge port that communicates with the annular stirring chamber. The burner is installed at the end of the discharging zone away from the feed inlet. Multiple sets of stirring blades are fixedly installed at intervals on the outer wall of the inner cylinder within the annular stirring chamber.

[0008] Furthermore, the discharge area is provided with multiple discharge ports spaced apart along its circumference.

[0009] Furthermore, the first guide blade is spirally distributed along the inner wall of the guide zone, and the second guide blade is spirally distributed along the inner wall of the discharge zone, with the spiral directions of the two being opposite.

[0010] Furthermore, the stirring blade assembly includes a stirring shaft and inner and outer blades arranged in opposite directions along the axis of the stirring shaft.

[0011] Furthermore, the drive mechanism includes a drive motor mounted on the frame and a drag ring fixedly sleeved on the outer wall of the inner cylinder. The power output end of the drive motor is connected to a drag wheel, and the outer contour of the drag wheel contacts the outer contour of the drag ring.

[0012] Furthermore, the outer cylinder is also equipped with an asphalt spraying pipe for adding asphalt and a powder scale for adding mineral powder.

[0013] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following advantages:

[0014] 1. This utility model features a fixed outer cylinder with an inner cylinder coaxially fitted inside, capable of rotating in both forward and reverse directions relative to the outer cylinder. The inner cylinder is axially divided into a guiding zone, a lifting zone, and a discharging zone. The inner wall of the guiding zone is equipped with first guiding blades, and the inner wall of the discharging zone is equipped with second guiding blades rotating in the opposite direction to the first guiding blades. By controlling the forward and reverse rotation of the inner cylinder, the material is guided and dried, and the material discharge is controlled, ensuring the drying temperature of the material. Regardless of whether the inner cylinder rotates forward or backward, the stirring blades on the outer wall of the inner cylinder can stir and mix the material in the annular stirring chamber. Furthermore, the discharge gate of the outer cylinder is independently controlled, allowing the mixing and drying of the mixture to proceed simultaneously without interference. This not only improves the production quality of asphalt mixtures but also increases the production efficiency of the equipment.

[0015] 2. This utility model uses multiple sets of stirring blades, consisting of inner and outer blades arranged in opposite directions relative to the stirring shaft axis, installed on the outer wall of the inner cylinder. These blades drive the mixture to form a complex counter-current flow within the annular stirring chamber, significantly improving the uniformity of stirring and the quality of the finished product. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the inner cylinder rotating in the forward direction according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the inner cylinder being reversed according to an embodiment of the present utility model. Detailed Implementation

[0019] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Many details are described below to provide a comprehensive understanding of this utility model; however, those skilled in the art can implement this utility model without these details. Well-known components, methods, and processes will not be described in detail below.

[0020] This utility model provides an intermittent drying and stirring integrated device, referring to... Figure 1 It includes a cylindrical outer cylinder 10, an inner cylinder 20, a drive mechanism 30, and a burner 40. The outer cylinder 10 is fixedly mounted on the frame and is arranged horizontally. The inner cylinder 20 is coaxially sleeved inside the outer cylinder 10 and can rotate in both directions. The inner wall of the outer cylinder 10 and the inner cylinder 20 form an annular stirring chamber 101.

[0021] The bottom of the outer cylinder 10 is equipped with an openable and closable discharge gate 102 for discharging the finished asphalt mixture after mixing. The discharge gate 102 is usually driven by a cylinder or electric push rod to ensure rapid opening and closing and reliable sealing. On the side wall of the outer cylinder 10, an asphalt spraying pipe 103 and a powder weighing device 104 are also installed. The asphalt spraying pipe 103 is used to spray liquid asphalt evenly into the annular mixing chamber 101 in an atomized form, while the powder weighing device 104 is used to accurately measure and add mineral powder and other powders.

[0022] Reference Figure 2 The front end of the inner cylinder 20 ( Figure 2 The left end) is equipped with a feed inlet 21 for feeding sand and gravel aggregates; the rear end of the inner cylinder 20 ( Figure 2 Multiple discharge ports 22 are spaced apart along the circumference at the right end, and these discharge ports 22 directly connect the inside of the inner cylinder 20 to the annular stirring chamber 101.

[0023] To clearly describe the functional divisions of the inner cylinder, this embodiment divides the inner cylinder 20 into three sections along the axial direction: a guiding zone 23, a lifting zone 24, and a discharge zone 25. The guiding zone 23 has the aforementioned feed inlet 21 at its front end; the lifting zone 24 is located in the middle of the inner cylinder 20; and the discharge zone 25 is located at the rear end of the inner cylinder 20 (i.e., multiple discharge ports 22 are installed in this discharge zone). The aforementioned burner 40 is installed at the end of the discharge zone 25 away from the feed inlet 21; its flame is sprayed counter-currently along the inner cylinder axis, creating counter-current heating with respect to the aggregate conveying direction.

[0024] A first guide blade 231 is installed on the inner wall of the guide zone 23. The first guide blade 231 is spirally distributed along the inner wall of the guide zone 23. When the inner cylinder 20 rotates in the forward direction (for example, clockwise when viewed from the feed port 21), the first guide blade 231 pushes the aggregate toward the lifting zone 24, so that the aggregate is dried in the lifting zone 24.

[0025] Lifting blades 241 are installed on the inner wall of the lifting zone 24. The function of the lifting blades 241 is to pick up and throw the aggregate down during the rotation of the inner cylinder 20, forming a uniform material curtain, so that the aggregate can fully contact the hot airflow generated by the burner, thereby achieving efficient drying.

[0026] A second guide blade 251 is installed on the inner wall of the discharge zone 25. The second guide blade 251 is also spirally distributed along the inner wall of the discharge zone 25, but its spiral direction is opposite to that of the first guide blade 231. When the inner cylinder 20 rotates clockwise, the second guide blade 251 pushes the aggregate towards the front end of the inner cylinder 20, preventing the aggregate from being discharged prematurely from the discharge port 22; when the inner cylinder 20 rotates counterclockwise, the second guide blade 251 pushes the aggregate towards the rear end of the inner cylinder 20, and quickly pushes the dried hot aggregate from the discharge port 22 into the annular mixing chamber 101.

[0027] Multiple sets of stirring blades 26 are fixedly installed axially at intervals on the outer wall of the inner cylinder 20. These stirring blade sets 26 are located within the annular stirring chamber 101. Each set of stirring blades 26 includes a stirring shaft 261 fixed to the outer wall of the inner cylinder 20, and inner blades 262 and outer blades 263 spaced apart along the stirring shaft 261. The inner blades 262 and outer blades 263 are arranged in opposite directions relative to the axis of the stirring shaft 261, that is, their pushing directions are opposite. When the inner cylinder 20 rotates, the opposing inner blades 262 and outer blades 263 drive the mixture to form a complex countercurrent flow within the annular stirring chamber 101, thereby achieving rapid and uniform forced stirring, significantly improving the uniformity of stirring and the quality of the finished product.

[0028] The drive mechanism 30 is used to drive the inner cylinder 20 to rotate in both directions. In this embodiment, the drive mechanism 30 includes a drive motor 301 fixedly mounted on the outer frame of the outer cylinder 10, a roller 302 connected to the output shaft of the drive motor 301, and a drag ring 303 fixedly sleeved on the outer wall of the inner cylinder 20. The outer circumferential surface of the roller 302 and the outer circumferential surface of the drag ring 303 are in frictional contact, and the power is transmitted to the inner cylinder 20 through friction, so as to achieve smooth and reliable driving.

[0029] Reference Figures 2-3 The working process of this utility model will be briefly described below with reference to the accompanying drawings:

[0030] 1. The drive mechanism 30 drives the inner cylinder 20 to rotate in the forward direction (e.g., Figure 2 Cold aggregate is fed into the feed inlet 21, guided into the lifting zone 24 by the guide zone, where it is scooped up and scattered by the lifting blades to form a material curtain. This curtain of material exchanges heat with the hot flue gas generated by the burner 40 and is thus dried. Because the spiral direction of the second guide blade 251 is opposite to that of the first guide blade 231, the aggregate is confined to the lifting zone 24 and will not be discharged from the discharge inlet 22.

[0031] 2. Once the aggregate inside the inner cylinder 20 has dried to the required standard, the drive mechanism 30 reverses, causing the inner cylinder 20 to rotate in the opposite direction (e.g., ...). Figure 3 Under the action of the second guide blade 251, the dried hot aggregate is quickly discharged from the discharge port 22 into the annular mixing chamber 101.

[0032] 3. Mineral powder and asphalt are added to the hot aggregate in the annular mixing chamber 101 through the powder weighing device 104 and the asphalt spraying pipe 103. The drive mechanism 30 drives the inner cylinder 20 to continue to rotate in reverse or forward. The mixing blade assembly 26 fixed on the outer wall of the inner cylinder 20 performs forced mixing of the mixture in the annular mixing chamber 101. Since the inner blade 262 and the outer blade 263 are arranged in opposite directions, the mixture forms a complex counter-current flow in the annular mixing chamber 101, ensuring the full mixing of asphalt, aggregate and mineral powder.

[0033] 4. After the mixing reaches the predetermined time, open the discharge gate 102 at the bottom of the outer cylinder 10 to discharge the finished asphalt mixture, completing one work cycle.

[0034] This invention utilizes the partitioned design of the inner cylinder 20, forward and reverse rotation control, and the coordinated action of the first guide blade 231, the second guide blade 251, and the mixing blade assembly 26 to achieve material guiding and drying control as well as material discharge control, ensuring the drying temperature of the material. Regardless of whether the inner cylinder rotates forward or backward, the mixing blade assembly on the outer wall of the inner cylinder can stir and mix the material in the annular mixing chamber. Furthermore, the discharge gate of the outer cylinder is independently controlled, allowing the mixing and drying of the mixture to proceed simultaneously without interference. This not only significantly improves the uniformity of the asphalt mixture and the quality of the finished product but also increases the production efficiency of the equipment.

[0035] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. An intermittent drying and stirring integrated device, comprising an outer cylinder, an inner cylinder, a drive mechanism, and a burner, characterized in that: The outer cylinder is fixedly mounted on the frame, and its bottom is provided with an openable and closable discharge gate; The inner cylinder is coaxially sleeved inside the outer cylinder, forming an annular stirring chamber between the inner cylinder and the inner wall of the outer cylinder. The driving mechanism is connected to the inner cylinder for driving the inner cylinder to rotate in the forward or reverse direction. The inner cylinder is divided into a guiding zone, a lifting zone, and a discharging zone along the axial direction. The front end of the guiding zone is provided with a feed inlet, and the inner wall of the guiding zone is equipped with a first guiding blade. The inner wall of the discharging zone is equipped with a second guiding blade, and the guiding directions of the first and second guiding blades are opposite. The discharging zone is provided with a discharge port, which is connected to the annular stirring chamber. The burner is installed at the end of the discharging zone away from the feed inlet. Multiple sets of stirring blades are fixedly installed at intervals on the outer wall of the inner cylinder inside the annular stirring chamber.

2. The intermittent drying and stirring integrated device according to claim 1, characterized in that: The discharge area is provided with multiple discharge ports spaced apart along its circumference.

3. The intermittent drying and stirring integrated device according to claim 1, characterized in that: The first guide blade is spirally distributed along the inner wall of the guide zone, and the second guide blade is spirally distributed along the inner wall of the discharge zone, with opposite spiral directions.

4. The intermittent drying and stirring integrated device according to claim 2, characterized in that: The stirring blade assembly includes a stirring shaft and inner and outer blades arranged in opposite directions along the axis of the stirring shaft.

5. The intermittent drying and stirring integrated device according to claim 3, characterized in that: The drive mechanism includes a drive motor mounted on the frame and a drag ring fixedly sleeved on the outer wall of the inner cylinder. The power output end of the drive motor is connected to a drag wheel, and the outer contour of the drag wheel contacts the outer contour of the drag ring.

6. The intermittent drying and stirring integrated device according to claim 1, characterized in that: The outer cylinder is also equipped with an asphalt spraying pipe for adding asphalt and a powder scale for adding mineral powder.

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