阅读说明：本技术 一种沥青搅拌站的骨料用筛网系统 (Aggregate screen mesh system of asphalt mixing station ) 是由 徐波 刘克国 郑岩 于 2018-08-14 设计创作，主要内容包括：本发明属于沥青混合料生产设备技术领域,特别涉及一种沥青搅拌站的骨料用筛网系统,其包括沿水平方向倾斜设置的初筛分网,所述初筛分网下方依次设有与初筛分网倾斜方向相反的细筛组件和粗筛组件,所述粗筛组件与细筛组件平行设置。该沥青搅拌站的骨料用筛网系统能够实现对沥青骨料的快速筛分,提高了沥青的拌和效率,且占地面积小。(The invention belongs to the technical field of asphalt mixture production equipment, and particularly relates to a screen mesh system for aggregates of an asphalt mixing plant. This screen cloth system for aggregate at bituminous mixing plant can realize the quick screening to the pitch aggregate, has improved the mixing efficiency of pitch, and area is little.)

1. The utility model provides a screen cloth system for aggregate at bituminous mixing plant which characterized in that: including the preliminary screening net (2) that sets up along the horizontal direction slope, preliminary screening net (2) below is equipped with in proper order and sieves net (2) inclination direction opposite's fine screen subassembly (3) and coarse screen subassembly (4) with preliminary screening, coarse screen subassembly (4) and fine screen subassembly (3) parallel arrangement.

2. The screen system for aggregate of asphalt mixing plant according to claim 1, characterized in that: the fine screen assembly (3) comprises a first screen (31), a second screen (32), a third screen (33) and a material receiving plate (35) which are vertically connected.

3. The screen system for aggregate of asphalt mixing plant according to claim 2, characterized in that: and a fourth screen (34) is also arranged between the third screen (33) and the material receiving plate (35).

4. The screen system for aggregate of asphalt mixing plant according to claim 3, characterized in that: the mesh openings of the first screen (31), the second screen (32), the third screen (33) and the fourth screen (34) are sequentially reduced, and the mesh opening of the first screen (31) is smaller than the mesh opening of the primary screening net (2).

5. The screen system for aggregates of asphalt mixing plant according to claim 4, characterized in that: the meshes of the first screen (31), the second screen (32), the third screen (33) and the fourth screen (34) are square.

6. The screen system for aggregates of asphalt mixing plant according to claim 4, characterized in that: preliminary screening net (2) and first screen cloth (31) between be equipped with baffle (5) that set up along the horizontal direction slope, baffle (5) are the same with the incline direction of preliminary screening net (2).

7. The screen system for aggregate of asphalt mixing plant according to claim 1, characterized in that: the coarse screen assembly (4) comprises a fifth screen (41), a sixth screen (42) and a seventh screen (43) which are vertically arranged in a bearing mode.

8. The screen system for aggregates of asphalt mixing plant according to claim 7, characterized in that: the mesh openings of the fifth screen (41), the sixth screen (42) and the seventh screen (43) are sequentially reduced, and the mesh opening of the seventh screen (43) is larger than that of the primary screening net (2).

9. The screen system for aggregates of asphalt mixing plant according to claim 8, characterized in that: the fifth screen (41) and the sixth screen (42) are fish scale punching screens.

Technical Field

The invention belongs to the technical field of asphalt mixture production equipment, and particularly relates to a screen mesh system for aggregates of an asphalt mixing plant.

Background

With the wide development of various engineering constructions, the asphalt mixing plant is widely applied and mainly used as key equipment for asphalt pavement construction. The asphalt mixture is prepared by measuring and stirring materials such as sand and stone materials, asphalt, mineral powder and the like, and can be classified into extra-coarse type, medium type, fine type and sand type asphalt mixtures according to the nominal maximum particle size. The existing container type asphalt stirring equipment mainly comprises a cold material system, a drying system, a dust removal system, a powder system, a screen system, a hot aggregate bin, an asphalt pipeline system, a hot aggregate elevator, a metering system, a stirring system and a control system, and the occupied area is large.

Because the particle size scope in the grit material is comparatively wide and the screen cloth system is vertical distribution, lead to the screening effect poor to the grit material, work efficiency is lower, still can lead to the grit material that sieves out in the particle size can not reach the requirement, influence the grit material ratio of different particle sizes in the bituminous mixture, influence the quality of pitch product.

Disclosure of Invention

The invention aims to solve the problems and provides a screen mesh system for aggregates of an asphalt mixing plant, which can realize quick screening of asphalt aggregates, improves the mixing efficiency of asphalt and occupies small area.

The invention is realized by adopting the following technical scheme:

the utility model provides a screen cloth system for aggregate of bituminous mixing plant, includes the preliminary screening net that sets up along the horizontal direction slope, preliminary screening net below is equipped with in proper order and preliminary screening net inclination opposite's fine screen subassembly and coarse screen subassembly, coarse screen subassembly and fine screen subassembly parallel arrangement.

Preferably, the fine screen assembly comprises a first screen, a second screen, a third screen and a material receiving plate which are vertically connected.

Preferably, a fourth screen is arranged between the third screen and the material receiving plate.

In a preferred scheme, the mesh openings of the first screen, the second screen, the third screen and the fourth screen are sequentially reduced, and the mesh opening of the first screen is smaller than the mesh opening of the primary screening net.

Preferably, the mesh openings of the first screen, the second screen, the third screen and the fourth screen are square.

Preferably, a baffle which is obliquely arranged along the horizontal direction is arranged between the primary screening net and the first screen, and the oblique direction of the baffle is the same as that of the primary screening net.

Preferably, the coarse screen assembly comprises a fifth screen, a sixth screen and a seventh screen which are vertically arranged in a supporting manner.

Preferably, the mesh apertures of the fifth screen, the sixth screen and the seventh screen are sequentially reduced, and the mesh aperture of the seventh screen is larger than that of the primary screening screen.

Preferably, the fifth screen and the sixth screen are fish scale punching screens.

The invention has the beneficial effects that:

1. according to the invention, the aggregates with different particle sizes are obtained after the aggregates are subjected to multi-stage screening, the classification of the aggregates is refined, the aggregates can be strictly added according to the formula of the asphalt mixing plant, and the improvement of the quality of asphalt products is facilitated.

2. According to the invention, the aggregates are divided into fine aggregates and coarse aggregates and then are respectively screened, the fine aggregates have a large proportion and the separation speed is relatively high, and more screens are adopted to screen the fine aggregates, so that the separation precision is ensured, and the separation speed is accelerated; the coarse aggregate is independently screened relative to the fine aggregate, so that the risk of reduction of screening speed caused by plugging of screen holes is reduced, the screening effect is improved, and the method is suitable for industrial production.

3. The sieve pores of the fine sieve component are square, so that aggregates with irregular shapes are ensured to be in the same size grade, the proportioning accuracy of the aggregates with different particle sizes in the asphalt mixture is improved, and the quality of asphalt is ensured to meet the requirement.

4. According to the invention, each screen is vertically arranged in a supporting manner, so that the total installation space of the screens is saved.

5. The fifth screen and the sixth screen are fish scale punching screens, so that the probability of aggregates passing through screen holes is increased, the screening time is further shortened, and the comprehensive production efficiency can be improved by reasonably setting the vibration frequency of the screens.

6. The baffle plate improves the contact length of the fine aggregate and the fine screen assembly, increases the contact area, and prolongs the action time of the fine screen assembly on the fine aggregate, thereby improving the screening effect and the production efficiency.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view showing the construction of a screen system for aggregate used in an asphalt mixing plant according to the present invention.

In the figure, 1, a sieve box; 11. a feeding port; 12. a discharge port; 2. primarily screening the net; 3. a fine screen assembly; 31. a first screen; 32. a second screen; 33. a third screen; 34. a fourth screen; 35. a material receiving plate; 4. a coarse screen assembly; 41. a fifth screen; 42. a sixth screen; 43. a seventh screen; 5. and a baffle plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by persons skilled in the art without any inventive step based on the embodiments of the present invention, belong to the protection scope of the present invention.

As shown in fig. 1, the aggregate vibrating screen for the asphalt mixing plant comprises a screen box 1, a screen mesh system for aggregate of the asphalt mixing plant arranged inside the screen box 1, and a vibration exciter for driving the screen mesh system for aggregate of the asphalt mixing plant to vibrate, wherein the vibration exciter can adopt a single-shaft vibration exciter, a double-shaft vibration exciter or other various vibration exciters capable of enabling the screen mesh system for recycling construction waste to vibrate, and is not limited herein.

The screen mesh system for aggregate of asphalt mixing plant includes along the preliminary screening net 2 of horizontal direction slope setting, preliminary screening net 2 below is equipped with in proper order and preliminary screening net 2 opposite direction of slope's fine screen subassembly 3 and coarse screen subassembly 4, coarse screen subassembly 4 sets up with fine screen subassembly 3 parallel.

In this embodiment, the fine screen assembly 3 includes a first screen 31, a second screen 32, a third screen 33, and a fourth screen 34, which are disposed in a vertically-supported manner and have sequentially-reduced screen hole diameters, and a material receiving plate 35 disposed below the fourth screen 34, where the screen holes of the first screen 31, the second screen 32, the third screen 33, and the fourth screen 34 are square. Due to the fact that the shape of the aggregates is irregular, the square sieve pores can guarantee that the aggregates are in the same size grade to the maximum extent, matching accuracy of the aggregates with different particle sizes in the asphalt mixture is improved, and the quality of asphalt is guaranteed to meet requirements.

In this embodiment, the coarse screen assembly 4 includes a fifth screen 41, a sixth screen 42 and a seventh screen 43, which are disposed in a vertically-supported manner and have successively smaller screen apertures. According to the invention, each screen is vertically arranged in a supporting manner, so that the total installation space of the screens is saved.

Specifically, taking the primary screening net 2 with square screen holes as an example, the screen hole diameter of each screen is as follows: the mesh aperture of the primary screening net 2 is as follows: 25 × 25mm, mesh opening size of the first screen 31: 16 x 16mm, mesh opening size of the second screen 32: 11 x 11mm, mesh opening size of the third screen 33: 6 x 6mm, mesh opening size of the fourth screen 34: 3 × 3mm, mesh opening size of the fifth mesh 41: 60mm by 60mm, mesh opening size of the sixth screen 42: 50mm by 50mm, mesh opening size of seventh mesh 43: 40 mm. Since the primary screening net 2 is mainly intended to divide the aggregates into fine aggregates and coarse aggregates, rather than directly obtaining the screened product, the mesh of the primary screening net 2 may be circular, square or other various shapes, which is not limited herein.

The working principle of the invention is as follows: the aggregates enter the primary screening net 2 from the feeding port 11 and are divided into fine aggregates with the particle size of below 25mm and coarse aggregates with the particle size of above 25mm, then the fine aggregates and the coarse aggregates enter the fine screening component 3 and the coarse screening component 4 to be screened respectively, then the aggregates with different particle sizes are obtained from the discharge ports 1212, and the screened aggregates are added into the asphalt according to the proportion for use;

the fine aggregate accounts for a large amount, the particle size difference of the fine aggregates of adjacent levels is small, the separation speed is relatively high, and more screens are adopted to screen the fine aggregates, so that the separation precision is ensured, and the separation speed is accelerated;

the coarse aggregates in adjacent levels have larger particle size difference, and because the volume is larger, if the coarse aggregates and the fine aggregates are directly separated by the mixed material, the mesh holes of the screen are easily blocked, so that the screening speed is reduced, and the separation effect is poor. And the coarse aggregate accounts for a small amount, the overall screening effect is not influenced even if the screening time is long, and the method is suitable for industrial production.

In this embodiment, the fifth screen 41 and the sixth screen 42 are fish scale punching screens. The surface of the fish scale punching screen is provided with the bulges, so that the thickness of the aggregate flowing layer is reduced, the blocking effect of the aggregate passing through the screen plate is reduced, the advection movement of the aggregate clinging to the inner wall of the screen plate is changed into the pulsation movement, the opportunity that the aggregate passes through the screen holes is increased, the screening time is further reduced, and the comprehensive production efficiency is improved by reasonably setting the vibration frequency of the screen.

In this embodiment, a baffle 5 which is obliquely arranged along the horizontal direction is arranged between the primary screening net 2 and the first screen 31, the baffle 5 and the primary screening net 2 are in the same oblique direction, and the lower end of the baffle 5 is not in contact with the primary screening net 2 and the first screen 31. The arrangement of the baffle 5 can enable the fine aggregate to firstly contact the top of the first screen 31, so that the contact length of the fine aggregate with the first screen 31, the second screen 32, the third screen 33 and the fourth screen 34 is increased, the contact area is increased, the acting time of each screen on the fine aggregate is prolonged, and the screening effect and the production efficiency are improved.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.