Discharging device for multi-stage screening of machine-made sand

Abstract

The utility model relates to the technical field of machine-made sand processing, and particularly discloses a machine-made sand multi-stage screening discharging device which comprises a screening machine body and a discharging port formed in the bottom end of the screening machine body, the discharging port is detachably connected with a discharging pipe, and the discharging pipe is divided into an upper pipe section and a lower pipe section; the bottom end of the upper-section pipe is detachably connected with the top end of the lower-section pipe, a plurality of baffles are arranged in the upper-section pipe and distributed in the circumferential direction of the inner side wall of the upper-section pipe, the baffles comprise the long baffles and the short baffles, and the long baffles and the short baffles are arranged in the upper-section pipe in a staggered and fishbone-shaped mode and obliquely arranged downwards. The baffle plays a role in blocking and decelerating airflow flowing from top to bottom in the upper section pipe. The upper section pipe similar to the internal structure of the Tesla valve is arranged at the discharging port, discharging of the discharging port is not affected while a large amount of air is prevented from entering the screening machine body from the discharging port, the situation that screening of the machine-made sand is affected, coarse sand or medium sand or fine sand is discharged in a mixed mode is avoided, and the screening effect of the screening machine body on the machine-made sand is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of machine-made sand processing, in particular to a feeding device for multi-stage screening of machine-made sand. Background Art

[0002] As natural sand and gravel resources are gradually depleted, artificial sand and gravel will become the main source of construction aggregates. Artificial sand refers to sand processed by sand making machines and other auxiliary equipment. Since a variety of stones, various tailings and waste resources can be used to process artificial sand, its sand source is extensive. In addition, artificial sand has excellent properties such as stable particles and controllable particle shape. Therefore, it is a general trend to replace natural sand as fine aggregate to prepare artificial sand concrete. Since artificial sand of different particle sizes has different uses, for example, coarse sand is suitable for filling roadbeds and dams and other construction projects; medium sand is suitable for masonry and plastering work in reinforced concrete structures and foundations, walls and other buildings; fine sand is suitable for the production of internal and external wall finishes, floors and putty, so it needs to be screened during the processing of artificial sand to meet different usage requirements.

[0003] The Chinese utility model patent with the publication number "CN210523078U" discloses a multi-stage screening device for machine-made sand using a negative pressure method, which includes a hollow cavity for air selection of materials, a machine-made sand feed port is provided above the hollow cavity, an air inlet is provided on the side wall of the hollow cavity, an air outlet is provided above or on the side wall of the hollow cavity, and a dust removal device is connected to the air outlet; a discharge port is provided below the hollow cavity, and more than three partition plates are connected to the discharge port, and the more than three partition plates are arranged according to the air inlet direction of the air inlet; more than three partition plates are separated to form more than four graded receiving troughs. By opening a feed port and a discharge port at the upper and lower ends of a hollow cavity, setting an air inlet and an air outlet on the left and right sides, and setting more than three dividing plates below the discharge port, materials of the same material and different particle sizes are affected by wind when falling from above, and materials of different particle sizes are blown to different discharge port positions. When screening artificial sand, under negative pressure, all outlets will also supply a large amount of air into the hollow cavity. The wind force entering the hollow cavity from the outlet and the wind force entering the hollow cavity from the air inlet will conflict with each other, affecting the wind direction from left to right. As a result, the screening of artificial sand is affected, and coarse sand, medium sand or fine sand are discharged as a mixture, resulting in unsatisfactory screening effect. Utility Model Content

[0004] The utility model aims to provide a feeding device for multi-stage screening of machine-made sand, so as to solve the problem that a large amount of air enters the hollow cavity through the current discharge port, which affects the screening of the machine-made sand and causes the mixed discharge of coarse sand, medium sand or fine sand, resulting in unsatisfactory screening effect.

[0005] In order to solve the above problems, the technical solutions provided are as follows:

[0006] A feeding device for multi-stage screening of machine-made sand comprises a screening machine body and a discharge port arranged at the bottom end of the screening machine body, wherein the discharge port is detachably connected with a discharge pipe, and the discharge pipe is divided into an upper pipe and a lower pipe, and the bottom end of the upper pipe is detachably connected to the top end of the lower pipe, and a plurality of baffles are arranged in the upper pipe, and the plurality of baffles are circumferentially distributed along the inner wall of the upper pipe, and the baffles comprise long baffles and short baffles, and the plurality of long baffles and short baffles are staggered in a herringbone shape in the upper pipe and tilted downward, and the baffles have a blocking and decelerating effect on the airflow flowing from top to bottom in the upper pipe.

[0007] The basic principle of the above technical solution is that the machine-made sand screened out from the screening machine body comes out from the discharge port and first flows through the upper pipe. A number of baffles arranged downwardly in the upper pipe will not hinder the machine-made sand from flowing from top to bottom. The machine-made sand flowing out of the upper pipe flows through the lower pipe for discharge. When a large amount of air enters the pipe mouth of the lower pipe, the fishbone structure formed by the several baffles arranged downwardly in the upper pipe will hinder the wind, resulting in a large amount of wind entering the lower pipe can only flow into the screening machine body in a small amount and slowly from bottom to top, which will hardly affect the screening of the machine-made sand in the screening machine body.

[0008] The beneficial effect of the above technical solution is that compared with the existing method of directly discharging materials from the discharge port at the bottom of the screening machine body, the technical solution arranges an upper pipe at the discharge port that is similar to the internal structure of the Tesla valve, which prevents a large amount of air from entering the screening machine body from the discharge port without affecting the discharge of materials from the discharge port, thereby avoiding the impact on the screening of artificial sand and the mixed discharge of coarse sand, medium sand, fine sand or silt, and will not affect the screening effect of the screening machine body on the artificial sand.

[0009] Furthermore, the upper tube is connected to the discharge port by threads, and the threaded connection method can facilitate the removal and replacement of the upper tube from the discharge port.

[0010] Furthermore, the bottom end of the upper pipe section and the top end of the lower pipe section are connected via a fire flange. The fire flange connection mode can change the connection angle between the top end of the lower pipe section and the bottom end of the upper pipe section by rotating the fire flange.

[0011] Furthermore, the lower pipe section is bent horizontally to the left or right. By rotating the lower pipe section, the pipe opening of the bent lower pipe section can face the material conveyor belts in different directions.

[0012] Furthermore, the pipe opening of the lower pipe section is tilted, and the tilted pipe opening discharges the material so that the material will not fall directly below the lower pipe section, making it more convenient to receive the material.

[0013] Furthermore, the pipe mouth end of the lower pipe faces the conveyor belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a schematic diagram of the cross-sectional structure of the screening machine body of the utility model;

[0015] Figure 2 for Figure 1 A magnified schematic diagram of the structure at center A;

[0016] The figure marks in the drawings of the specification include: screening machine body 1, screening chamber 2, feed port 3, air inlet 4, dust removal equipment 5, discharge port 6, discharge pipe 7, upper pipe 71, lower pipe 72, fire flange 73, long baffle 74, and short baffle 75. DETAILED DESCRIPTION

[0017] The following is further described in detail through specific implementation methods:

[0018] Think attached Figure 1 For example, the feed port is at the upper end of the screening machine body 1, the discharge port 6 is at the lower end of the screening machine body 1, the air inlet 4 is at the left side of the screening machine body 1, and the dust removal device 5 is at the right side of the screening machine body 1, with this direction as the reference.

[0019] The embodiment is basically as shown in the attached Figure 1-2 As shown:

[0020] A feeding device for multi-stage screening of machine-made sand, such as Figure 1 As shown, it includes a screening machine body 1, a screening chamber 2 arranged horizontally from left to right is provided in the screening machine body 1, an inlet 3 connected to the screening chamber 2 is provided at the upper end of the screening machine, an air inlet 4 connected to the left side of the screening chamber 2 is provided on the left side of the screening machine body 1, a dust removal device 5 is connected to the right side of the screening chamber 2, and the dust removal device 5 is located on the right side of the screening machine body 1 for dust removal, and three discharge ports 6 arranged from left to right are provided at the bottom end of the screening machine body 1, and the discharge ports 6 are connected to the bottom end of the screening chamber 2, and each discharge port 6 is connected to a discharge pipe 7 by a thread, as shown in FIG. Figure 2 As shown, the discharge pipe 7 is divided into an upper pipe 71 and a lower pipe 72. The bottom end of the upper pipe 71 is connected to the top end of the lower pipe 72 by a fire flange 73. A plurality of baffles are arranged in the upper pipe 71. The plurality of baffles are circumferentially distributed along the inner wall of the upper pipe 71. The baffles include long baffles 74 and short baffles 75. The plurality of long baffles 74 and short baffles 75 are arranged in a staggered manner in a fishbone shape in the upper pipe 71 and tilted downward. The fishbone arrangement structure is similar to the internal structure of the Tesla valve, so that the baffles hinder and slow down the airflow flowing from top to bottom in the upper pipe 71. The lower pipe 72 is bent horizontally to the left or right by 45°, and the pipe mouth of the lower pipe 72 is tilted. The pipe mouth orientation of the lower pipe 72 is changed by rotating the fire flange 73 so that the pipe mouth end of the lower pipe 72 faces the conveyor belt.

[0021] The specific implementation process is as follows:

[0022] Start the screening machine body 1 and the dust removal device 5. The screening machine body 1 is in a negative pressure state, and the air inlet 4 flows a large amount of air into the screening chamber 2. Figure 1 As shown in the direction indicated by the middle arrow, the wind flows from the left side of the screening chamber 2 to the right side, and the unscreened machine-made sand is poured into the screening chamber 2 from the inlet 3. Under the action of wind, the machine-made sand in the screening chamber 2 will be divided into coarse sand, medium sand and fine sand, and the coarse sand, medium sand and fine sand will flow out of the discharge port 6 from left to right in turn, first flowing through the upper tube 71, and the several baffles arranged downwardly in the upper end tube will not hinder the machine-made sand from flowing from top to bottom. The machine-made sand flowing out of the upper end tube will flow through the lower tube 72 for discharge. When a large amount of wind enters the pipe mouth end of the lower tube 72, the fishbone structure formed by the several baffles arranged downwardly in the upper tube 71 will hinder the wind, resulting in a large amount of wind entering the lower tube 72 can only flow into the screening machine body 1 from bottom to top in a small amount and slowly, which will hardly affect the screening effect of the wind force in the screening chamber 2 on the machine-made sand. In this solution, an upper pipe 71 with a similar internal structure to that of a Tesla valve is arranged at the end of the discharge port 6 of the screening machine body 1, thereby preventing a large amount of air from entering the screening machine body 1 from the discharge port 6 without affecting the discharge of material from the discharge port 6, thereby preventing the screening of machine-made sand from being affected and causing mixed discharge of coarse sand, medium sand or fine sand. The solution is worthy of popularization and use.

[0023] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A feeding device for multi-stage screening of machine-made sand, comprising a screening machine body and a discharge port arranged at the bottom end of the screening machine body, characterized in that: The discharge port is detachably connected to a discharge pipe, which is divided into an upper pipe and a lower pipe. The bottom end of the upper pipe is detachably connected to the top end of the lower pipe. A plurality of baffles are arranged in the upper pipe, and the plurality of baffles are circumferentially distributed along the inner wall of the upper pipe. The baffles include long baffles and short baffles. The plurality of long baffles and short baffles are staggered in a herringbone shape in the upper pipe and tilted downward. The baffles have a blocking and decelerating effect on the airflow flowing from top to bottom in the upper pipe.

2. The feeding device for multi-stage screening of machine-made sand according to claim 1, characterized in that: The upper pipe is connected to the discharge port via threads.

3. The feeding device for multi-stage screening of machine-made sand according to claim 2 is characterized in that: The bottom end of the upper pipe section and the top end of the lower pipe section are connected via a fire protection flange.

4. The feeding device for multi-stage screening of machine-made sand according to claim 3, characterized in that: The lower pipe section is bent horizontally to the left or right.

5. The feeding device for multi-stage screening of machine-made sand according to claim 4, characterized in that: The pipe opening of the lower pipe is arranged obliquely.

6. The feeding device for multi-stage screening of machine-made sand according to claim 5, characterized in that: The pipe mouth end of the lower pipe faces the conveyor belt.

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