Asphalt milling material crushing and screening device

Abstract

The utility model discloses an asphalt milling material crushing and screening device which comprises a first crusher and a second crusher, a first crushing roller and a first screen are arranged in the first crusher, and a discharge port of the first crusher is connected with a feed port of the second crusher through a first elevator; a first smashing roller and a first screen are arranged in the first smashing machine, a second smashing roller and a second screen are arranged in the second smashing machine, a discharging port and a feeding port of the second smashing machine are connected through a second elevator, the first smashing roller is composed of two conical rollers which are oppositely arranged, and the second smashing roller is composed of two straight groove star-shaped rollers which are arranged side by side. The device is simple in structure and convenient to use, greatly enhances the stripping capacity of the asphalt milling material, and can perform secondary or multiple times of crushing, so that the grinding and crushing of the asphalt milling material are more sufficient, the required grain composition can be achieved, the repeated crushing of qualified fine materials is avoided, the crushing efficiency is improved, and the energy is saved.

Description

Asphalt milling material crushing and screening device Technical Field

[0001] This utility model relates to the field of crusher technology, and in particular to an asphalt milling material crushing and screening device. Background Technology

[0002] The reconstruction and maintenance of asphalt pavements generate a large amount of reclaimed asphalt (RAP). This reclaimed asphalt is crushed and screened, then appropriately mixed with new aggregates and asphalt materials to form recycled asphalt mixtures with certain road performance characteristics. These mixtures can be reused for paving surface or base courses. This technology can recycle the vast majority of reclaimed asphalt, saving the cost of virgin asphalt and offering advantages such as environmental protection and resource conservation.

[0003] In existing technologies, milled material is typically crushed using a crusher, with a screen installed at the crusher's outlet to filter and screen the crushed material. This method generally results in incomplete crushing, leading to "false large aggregates" (or "pseudo-large aggregates") composed of many incompletely crushed small-diameter particles within the 5mm crushed aggregate. These pseudo-large aggregates have a high asphalt content but are prone to insufficient strength in subsequent applications. Therefore, manual labor combined with machinery is required to remove these incompletely crushed and shaped "pseudo-large aggregates" from the screen, which are then transported to the crusher's inlet for secondary crushing and screening. This method is labor-intensive and inefficient. Summary of the Invention

[0004] To solve the above problems, this utility model provides an asphalt milling material crushing and screening device, which can be specifically implemented using the following technical solution:

[0005] The asphalt milling material crushing and screening device of this utility model includes a first crusher and a second crusher. The first crusher is equipped with a first crushing roller on top and a first screen on the bottom. The discharge port of the first crusher is connected to the feed port of the second crusher through a first elevator. The second crusher is equipped with a second crushing roller on top and a second screen on the bottom. The discharge port of the second crusher is connected to the feed port of the second crusher through a second elevator. The first crushing roller is composed of two opposing conical rollers. The surface of the conical rollers is provided with crushing teeth, and the crushing teeth of the two conical rollers mesh with each other. The second crushing roller is composed of two parallel straight groove star rollers. The surface of the straight groove star rollers is provided with staggered arc-shaped grinding protrusions and arc-shaped grinding grooves, and the arc-shaped grinding protrusions and arc-shaped grinding grooves of the two straight groove star rollers mesh with each other.

[0006] The first conical roller of the first crushing roller has a first motor and a first drive gear on its shaft, and the other conical roller has a first driven gear that meshes with the first drive gear on its shaft.

[0007] A second motor and a second drive gear are provided on the shaft of one of the straight groove star-shaped rollers of the second crushing roller, and a second driven gear that meshes with the second drive gear is provided on the shaft of the other straight groove star-shaped roller.

[0008] The second crusher is provided with a transverse self-adjusting mechanism connected to the second crushing roller on its outer side. The transverse self-adjusting mechanism includes an elastic element, a rotating element, and a fixed element that are coaxially arranged with the second driven gear. The elastic element, rotating element, and fixed element are arranged on the other side of the second crusher relative to the second driven gear and are arranged sequentially from the inside to the outside. The fixed element is fixedly connected to the outer shell of the second crusher through a bracket. The opposing surfaces of the rotating element and the fixed element are saddle-shaped structures that cooperate with each other.

[0009] Both the first and second screens are inclined downwards towards the outlet direction.

[0010] The asphalt milling material crushing and screening device provided by this utility model has a simple structure and is easy to use. It crushes and screens asphalt milling material through a crusher. The first crusher uses conical rollers with different surface linear velocities, and the second crusher uses straight groove star rollers that can move relatively horizontally, which greatly enhances the peeling ability of the asphalt milling material. Secondly, two elevators are cleverly set between the two crushers, so that unqualified "false large material" can be crushed a second or multiple times, making the grinding and crushing of the asphalt milling material more thorough. It can not only achieve the required particle size distribution, but also avoid the repeated crushing of qualified fine material, thereby improving crushing efficiency and saving energy. In this process, the asphalt milling material is automatically circulated and crushed without manual handling, reducing the labor intensity of workers and improving work efficiency. Attached Figure Description

[0011] Figure 1 is a structural schematic diagram of this utility model.

[0012] Figure 2 is a schematic diagram of the structure of the first crushing roller in Figure 1.

[0013] Figure 3 is a schematic diagram of the structure of the second crushing roller in Figure 1.

[0014] Figure 4 is a schematic cross-sectional view of the two straight groove star rollers in Figure 3.

[0015] Figure 5 is a three-dimensional structural diagram of the lateral self-adjusting mechanism in Figure 3.

[0016] Figure 6 is a schematic diagram of the relationship between the rotating part and the fixed part before and after rotating 90° in Figure 5. Detailed Implementation

[0017] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific working processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0018] As shown in Figures 1-6, the asphalt milling material crushing and screening device of this utility model includes a first crusher 1 and a second crusher 2. The first crusher 1 is provided with a first crushing roller on top and a first screen 3 on the bottom. The discharge port of the first crusher 1 is connected to the feed port of the second crusher 2 through a first elevator 4. The second crusher 2 is provided with a second crushing roller on top and a second screen 5 on the bottom. The discharge port of the second crusher 2 is connected to the feed port of the second crusher 2 through a second elevator 6.

[0019] Specifically, the first crushing roller consists of two opposing conical rollers 7, with their shafts arranged in parallel. At the same end of each shaft, the larger end of one conical roller 7 and the smaller end of the other are mounted (see Figure 2). Each conical roller 7 has crushing teeth 8 on its surface, and these teeth mesh with each other. The two conical rollers 7 are the same size. Because they are both conical, even with the same angular velocity, the linear velocity at each point on their surface is different. Therefore, while the asphalt milling material is horizontally crushed by the two conical rollers 7, it also experiences an additional vertical force, thus improving the crushing effect. The first crushing roller is driven by a first motor 9. Specifically, the first motor 9 and a first drive gear 10 are mounted on the shaft of one of the conical rollers 7, and a first driven gear 11 meshing with the first drive gear 10 is mounted on the shaft of the other conical roller 7.

[0020] The second crushing roller consists of two parallel straight-groove star-shaped rollers 12. The surface of the straight-groove star-shaped rollers 12 has staggered arc-shaped grinding protrusions 12.1 and arc-shaped grinding grooves 12.2, and the arc-shaped grinding protrusions 12.1 and arc-shaped grinding grooves 12.2 of the two straight-groove star-shaped rollers 12 mesh with each other (see Figure 4). The above-mentioned second crushing roller is driven by a second motor 13. That is, the second motor 13 and the second driving gear 14 are mounted on the shaft of one of the straight-groove star-shaped rollers 12, and the second driven gear 15 that meshes with the second driving gear 14 is mounted on the shaft of the other straight-groove star-shaped roller 12.

[0021] To enhance the crushing effect of the second crushing roller, a lateral self-adjusting mechanism is also provided on the outside of the second crusher 2. This mechanism includes an elastic element 16, a rotating element 17, and a fixed element 18, coaxially arranged with the second driven gear 15. These elements are positioned on the other side of the second crusher 2 relative to the second driven gear 15, arranged sequentially from the inside out. The elastic element 16 is a compression spring, while the rotating element 17 and fixed element 18 can be made of wear-resistant plastic or metal castings coated with a wear-resistant layer. The fixed element 18 is fixedly connected to the outer casing of the second crusher 2 via a bracket. The rotating element 17 is fixed to the rotating shaft, and its opposite surface to the fixed element 18 forms a saddle-shaped structure that cooperates with each other (see Figure 5). Therefore, when the rotating part 17 rotates with the shaft to a position where it engages with the fixed part 18 (see the left figure in Figure 6), the two parts are tightly joined. When the rotating part 17 continues to rotate 90° (see the right figure in Figure 6), the raised surfaces of the two parts come into contact, causing the rotating part 17 to move along the shaft to the side of the second driven gear 15 under the pressure of the fixed part 18. That is, the straight groove star roller 12 where the second driven gear 15 is located moves laterally. This process is repeated, and the straight groove star roller 12 moves back and forth laterally in a regular manner, which enhances the grinding effect on the asphalt milling material.

[0022] To separate the substandard "false large material" and further crush it, a first screen 3 is installed below the first crushing roller, and a second screen 5 is installed below the second crushing roller. To facilitate the collection of the separated "false large material" and its feeding into the elevator, both the first screen 3 and the second screen 5 are inclined downwards towards the outlet, and a receiving cylinder is installed between them and the elevator inlet to prevent leakage and ensure that as much material as possible is fed into the elevator.

[0023] In operation, large pieces of milled asphalt material are first fed into the first crusher 1, where they undergo initial crushing by the first crushing roller. The crushed fine material is separated by the first screen 3, while the incompletely crushed "false large material" remains on the first screen 3 and enters the second crusher 2 via the first elevator 4 for further crushing. The fine material after the second crushing is separated by the second screen 5, while the "false large material" remaining on the second screen 5 is re-entered into the second crusher 2 via the second elevator 6 for further crushing. If the crushing does not meet the standard and "false large material" still exists on the second screen 5, it is then re-entered into the second crusher 2 for crushing. This cycle is repeated until the material is crushed to the required standard.

[0024] It should be noted that in the description of this utility model, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A device for crushing and screening asphalt milling materials, characterized in that: The system includes a first crusher and a second crusher. The first crusher has a first crushing roller at the top and a first screen at the bottom. The discharge port of the first crusher is connected to the feed port of the second crusher via a first elevator. The second crusher has a second crushing roller at the top and a second screen at the bottom. The discharge port of the second crusher is connected to the feed port of the second crusher via a second elevator. The first crushing roller is composed of two opposing conical rollers, each with crushing teeth on its surface, and the crushing teeth of the two conical rollers mesh with each other. The second crushing roller is composed of two parallel straight-groove star-shaped rollers, each with alternating arc-shaped grinding protrusions and arc-shaped grinding grooves on its surface, and the arc-shaped grinding protrusions and arc-shaped grinding grooves of the two straight-groove star-shaped rollers mesh with each other.

2. The asphalt milling material crushing and screening device according to claim 1, characterized in that: The first conical roller of the first crushing roller has a first motor and a first drive gear on its shaft, and the other conical roller has a first driven gear that meshes with the first drive gear on its shaft.

3. The asphalt milling material crushing and screening device according to claim 1, characterized in that: A second motor and a second drive gear are provided on the shaft of one of the straight groove star-shaped rollers of the second crushing roller, and a second driven gear that meshes with the second drive gear is provided on the shaft of the other straight groove star-shaped roller.

4. The asphalt milling material crushing and screening device according to claim 3, characterized in that: The second crusher is provided with a transverse self-adjusting mechanism connected to the second crushing roller on its outer side. The transverse self-adjusting mechanism includes an elastic element, a rotating element, and a fixed element that are coaxially arranged with the second driven gear. The elastic element, rotating element, and fixed element are arranged on the other side of the second crusher relative to the second driven gear and are arranged sequentially from the inside to the outside. The fixed element is fixedly connected to the outer shell of the second crusher through a bracket. The opposing surfaces of the rotating element and the fixed element are saddle-shaped structures that cooperate with each other.

5. The asphalt milling material crushing and screening device according to claim 1, characterized in that: Both the first and second screens are inclined downwards towards the outlet direction.

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