Fine sand grading system

Abstract

The utility model discloses a fine sand grading system which comprises a grading device, a plurality of collecting hoppers, a raw material bin, an elevator and a recovery device, the collecting hoppers are connected with the output end of the grading device in a one-to-one correspondence mode, the output end of the raw material bin is communicated with the input end of the elevator, and the grading device is a swinging screen. The input end of the swinging screen is connected with the output end of the elevator, the swinging screen is provided with a large-particle-size screen mesh, a medium-particle-size screen mesh and a small-particle-size screen mesh, and the output ends of the large-particle-size screen mesh, the medium-particle-size screen mesh and the small-particle-size screen mesh are connected and matched with the input ends of the collecting hoppers in a one-to-one correspondence mode; the output end, connected with the large-particle-size screen, of the collecting hoppers is connected and matched with the input end of the swinging screen through a material returning device. Compared with the prior art, materials in the raw material bin are directly transferred into the swinging screen through the elevator to be screened, and the transportation cost is not needed; and by means of the material returning device, large-size materials are subjected to secondary screening, and the screening effect is better.

Description

Technical Field

[0001] The utility model relates to the field of dry sand screening, in particular to a fine sand classification system. Background Art

[0002] Dry sand is the aggregate that has been dried and screened. The aggregate needs to be screened into fine sand of various particle sizes during the preparation process. The existing fine sand grading system mainly includes a feed hopper and a screener. The input end of the screener is connected to the output end of the feed hopper. The screener has several layers of screens, and the screener is provided with several sand outlets for discharging fine sand of different particle sizes and corresponding to the output ends of each screen. A collecting hopper is connected below the sand outlet of the screening machine. When used, the dry sand is sent to the feed hopper and transported to the screen to be screened into fine sand of different particle sizes, and the fine sand of different particle sizes finally falls into the collecting hopper.

[0003] The fine sand grading system of the above structure screens out fine sand through the screen, but when the dry sand enters the screen from the feed hopper in piles for screening, the dry sand is easily piled on the screen, and when the dry sand pile is too heavy, the screen cannot screen the dry sand. In order to solve the above problem, a vibration device is used to vibrate the screen, which has a low utilization rate of the screen and causes low screening efficiency. However, the vibration device is generally only in a local part of the screening machine, so that the screen cannot be used over a large area. If vibration devices are added in all directions, the production cost will increase; in addition, when the dry sand is transported to the feed hopper, it is usually necessary to use a truck to transport it from the raw material warehouse to the feed hopper, which makes the transportation cost higher.

[0004] In view of this, the inventor of this case conducted an in-depth study on the problem, which resulted in this case. Utility Model Content

[0005] The utility model aims to provide a fine sand classification system to solve the problems of low screening efficiency and high production cost of the existing fine sand classification system.

[0006] In order to achieve the purpose, the utility model adopts the following technical solution:

[0007] A fine sand grading system comprises a grading device and a collecting hopper, wherein a plurality of collecting hoppers are provided, and each collecting hopper is connected to an output end of the grading device in a one-to-one manner; the system also comprises a raw material bin, an elevator and a recovery device, wherein the output end of the raw material bin is connected to an input end of the elevator, the grading device is a swing screen, and the input end of the swing screen is connected to the output end of the elevator, and the swing screen is provided with a large particle size screen, a medium particle size screen and a small particle size screen, and the output ends of the large particle size screen, the medium particle size screen and the small particle size screen are connected to an input end of each collecting hopper in a one-to-one manner, and the output end of the collecting hopper in each collecting hopper connected to the large particle size screen is connected to the input end of the swing screen through a material return device.

[0008] The raw material bin is suspended by a mounting frame, the mounting frame is vertically arranged on the ground, the raw material bin is inside the mounting frame, output ports are opened on both left and right sides of the bottom surface of the raw material bin, the mounting frame is provided with an exposed port for exposing the output port, two elevators are provided, the two elevators are vertically arranged outside the left and right sides of the mounting frame respectively, and the output port is connected to the input end of the elevator through a connecting pipe, the connecting pipe is provided with a control valve for controlling the conduction or cutoff of the material, two swing screens are provided, and the input end of the swing screen is below the output end of the elevator.

[0009] The large particle size sieve has a sieve hole size greater than 0.850 mm, the medium particle size sieve is divided into a first medium particle size sieve and a second medium particle size sieve, the first medium particle size sieve has a sieve hole size of 0.425 mm-0.850 mm, the second medium particle size sieve has a sieve hole size of 0.212 mm-0.425 mm, and the small particle size sieve has a sieve hole size of 0.425 mm-0.125 mm.

[0010] A dividing valve is provided on the output end of each collecting hopper connected to the large-size particle screen. The dividing valve has an output port and a return port. A collecting bin is connected below the output port. The return port is connected to the input end of the swing screen through a return pipe. A return motor is provided on the output end of the return pipe to output the material from the output end of the return pipe to the input end of the swing screen. The dividing valve and the return pipe constitute the return device.

[0011] The utility model discloses a fine sand classification system. When used, the material is made to fall from the output end of the raw material bin into the input end of the elevator. The material is then output from the output end of the elevator and falls onto the input end of the swing screen. The screen is used to screen the material while the swing screen is swinging left and right, so that the material is divided into materials of various particle sizes. The materials of various particle sizes fall into the collecting hopper respectively. If the material output from the output end of the large particle size screen needs to be screened for the second time, the material return device is used to make the material fall into the swing screen again for the second screening. Compared with the prior art, the material in the raw material bin is directly transferred to the swing screen for screening through the elevator without the transportation cost. Moreover, the screening efficiency of the swing screen is higher than that of the traditional vibrating screen. Furthermore, the material return device is used to make the material output from the output end of the large particle size screen be screened for the second time, so that the screening effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0013] In order to further explain the technical solution of the present utility model, it is described in detail below with reference to the accompanying drawings.

[0014] A fine sand classification system, such as Figure 1 As shown, it includes a grading device, a collecting hopper 1, a raw material bin 2, an elevator 3 and a recovery device. There are several collecting hoppers 1, and each collecting hopper 1 is connected to the output end of the grading device in a one-to-one manner; the output end of the raw material bin 2 is connected to the input end of the elevator 3. Specifically, the raw material bin is suspended by a mounting frame, the mounting frame is vertically arranged on the ground, the raw material bin is in the mounting frame, and output ports are opened on both sides of the bottom surface of the raw material bin. The mounting frame is provided with an exposed port for exposing the output port. There are two elevators 3, which are vertically arranged outside the left and right sides of the mounting frame respectively, and the output port is connected to the input end of the elevator 3 through a connecting pipe. The connecting pipe is provided with a control valve 21 for controlling the conduction or cutoff of the material. The installation method and working principle of the elevator 3 and the control valve are well known to those skilled in the art and will not be elaborated here. When used, open the control valve, the material in the raw material bin is output from the output port and falls into the input end of the elevator through the connecting pipe, and the material is then output from the output end of the elevator.

[0015] The grading device is a rocking screen 4, and the input end of the rocking screen 4 is connected to the output end of the elevator 3; specifically, two rocking screens are provided, and the input end of the rocking screen 4 is located below the output end of the elevator 3, and the rocking screen 4 is provided with a large particle size screen 41, a medium particle size screen and a small particle size screen 42, and the output ends of the large particle size screen 41, the medium particle size screen and the small particle size screen 42 are connected and matched with the input end of each collecting hopper 1 in a one-to-one correspondence; specifically, the mesh size of the large particle size screen 41 is greater than 0.850mm, and the medium particle size screen is divided into a first medium particle size screen 43 and a second medium particle size screen 44, the mesh size of the first medium particle size screen 43 is 0.425mm-0.850mm, the mesh size of the second medium particle size screen 44 is 0.212mm-0.425mm, and the mesh size of the small particle size screen 42 is 0.425mm-0.125mm. There are five discharge ports on the swing screen, and the five discharge ports are arranged in sequence from top to bottom, among which four discharge ports are respectively connected and coordinated with the large particle size screen 41, the first medium particle size screen 43, the second medium particle size screen 44 and the small particle size screen 42. Correspondingly, there are five collecting hoppers, and the input ends of the five collecting hoppers are respectively connected with the five discharge ports. The five collecting hoppers respectively receive materials larger than 0.850mm, 0.425mm-0.850mm, 0.212mm-0.425mm, 0.425mm-0.125mm and less than 0.125mm. The specific structure and working mode of the swing screen 4 are well known to those skilled in the art and will not be elaborated here. When in use, the material is output from the output end of the elevator and falls downward into the input end of the swing screen. Under the action of the swing screen, the material is screened into five materials with different particle sizes.

[0016] The output end of each of the collecting hoppers 1 connected to the large-size screen 41 is connected to the input end of the swing screen 4 through a return device; specifically, a dividing valve (not shown in the figure) is provided on the output end of each of the collecting hoppers 1 connected to the large-size screen 41, and the dividing valve has an output port and a return port, and a collecting bin 5 is connected below the output port, and the other four collecting hoppers are also connected below the collecting bin 5, and the return port is connected to the input end of the swing screen 4 through a return pipe, and the return pipe A return motor is provided at the output end of the return pipe to output the material from the output end of the return pipe to the input end of the swing screen. The way in which the return motor controls the material to be output from the output end of the return pipe is a well-known technology for those skilled in the art and will not be elaborated on herein. The dividing valve and the return pipe constitute the return device; when in use, the dividing valve is opened to connect the return pipe with the return port, and the material larger than 0.850 mm falls into the input end of the swing screen through the return pipe, so that the material larger than 0.850 mm is screened for the second time.

[0017] The utility model discloses a fine sand classification system. When in use, the control valve is opened, and the material is output from the two output ports of the raw material bin and falls into the input ends of the two elevators 3 through the connecting pipe. The material is then output from the output ends of the two elevators and falls into the input end of the swing screen 4. The material is screened under the swing of the swing screen 4, so that the material is divided into materials of various particle size levels, that is, materials with a particle size greater than 0.850mm, materials with a particle size of 0.425mm-0.850mm, materials with a particle size of 0.212mm-0.425mm, materials with a particle size of 0.425mm-0.125mm and materials with a particle size less than 0.125mm. Materials of the same particle size level then fall into the collecting hopper 1 and merge into the collecting bin. If materials with a particle size greater than 0.850 mm need to be screened twice, the material distribution valve is opened and the return port is connected, so that materials with a particle size greater than 0.850 mm can pass through the return pipe and fall into the swing screen 4 for secondary screening. Compared with the prior art, the materials in the raw material bin 2 are directly transferred to the swing screen 4 for screening through the elevator 3, without transportation costs, and the screening efficiency of the swing screen 4 is higher than that of the traditional vibrating screen. Furthermore, the return device is used to perform secondary screening on materials with a particle size greater than 0.850 mm, so that the screening effect is better.

[0018] The product form of the utility model is not limited to the illustrations and embodiments of this case. Any appropriate changes or modifications made by anyone with similar ideas should be deemed to be within the patent scope of the utility model.

Claims

1. A fine sand classification system, comprising a classification device and a collecting hopper, wherein a plurality of collecting hoppers are provided, and each collecting hopper is connected to an output end of the classification device in a one-to-one correspondence; the characteristics are: It also includes a raw material bin, an elevator and a recovery device, wherein the output end of the raw material bin is connected to the input end of the elevator, the grading device is a rocking screen, the input end of the rocking screen is connected to the output end of the elevator, the rocking screen is provided with a large particle size screen, a medium particle size screen and a small particle size screen, the output ends of the large particle size screen, the medium particle size screen and the small particle size screen correspond to each other and are connected and matched with the input end of each collecting hopper one by one, and the output end of the collecting hopper in each collecting hopper that is connected to the large particle size screen is connected and matched with the input end of the rocking screen through a return device.

2. A fine sand classification system according to claim 1, characterized in that: The raw material bin is suspended by a mounting frame, the mounting frame is vertically arranged on the ground, the raw material bin is inside the mounting frame, output ports are opened on both left and right sides of the bottom surface of the raw material bin, the mounting frame is provided with an exposed port for exposing the output ports, two elevators are provided, the two elevators are vertically arranged outside the left and right sides of the mounting frame respectively, and the output ports are connected to the input ends of the elevators through connecting pipes, the connecting pipes are provided with control valves for controlling the conduction or cutoff of materials, two swing screens are provided, and the input ends of the swing screens are located below the output ends of the elevators.

3. A fine sand classification system according to claim 1, characterized in that: The large particle size sieve has a sieve hole size greater than 0.850 mm, the medium particle size sieve is divided into a first medium particle size sieve and a second medium particle size sieve, the first medium particle size sieve has a sieve hole size of 0.425 mm-0.850 mm, the second medium particle size sieve has a sieve hole size of 0.212 mm-0.425 mm, and the small particle size sieve has a sieve hole size of 0.425 mm-0.125 mm.

4. A fine sand classification system according to claim 1, characterized in that: A dividing valve is provided on the output end of each collecting hopper connected to the large-size particle screen. The dividing valve has an output port and a return port. A collecting bin is connected below the output port. The return port is connected to the input end of the swing screen through a return pipe. A return motor is provided on the output end of the return pipe to output the material from the output end of the return pipe to the input end of the swing screen. The dividing valve and the return pipe constitute the return device.

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