RU63258U1 - DEVICE FOR DETERMINING THE GRANULOMETRIC COMPOSITION OF BULK MATERIAL - Google Patents

Abstract

The utility model relates to the field of research of bulk materials in the sinter, metallurgical and other industries. The technical result is an increase in the number of fractions in the separation of bulk material, as well as an increase in the accuracy of determining the percentage of each fraction; increase the compactness and reliability of the device. The technical result is achieved by the fact that in the device for determining the particle size distribution of bulk material, consisting of a loading hopper mounted on a frame, a screen, a weighing device, a computing device, a command device, a system of actuators, while according to the proposal, the screen is made in the form of a box, in height of which flat sieves are horizontally fixed one above the other, on one side pivotally attached to the box with the possibility of rotation in a vertical plane, size the sieve cells are reduced from the upper sieve to the lower one, the screen box is made in the form of a rectangular pipe, the computing device is connected to the sensors of the weighing device. 7 ill.

Description

The utility model relates to the field of research of bulk materials in the sinter, metallurgical and other industries.

A known analyzer of samples of the grain composition of the crushing product, including a screen with a set of sieves, a vibrator, a weighing device [1]. For the purpose of mechanization and automation of screening and unloading processes, the screen body with a set of sieves of a ring shape is mounted on a vibrating platform equipped with a vibrator in the form of offset unbalances, creating reciprocating vibrations in the vertical plane and torsional vibrations around the vertical axis, and the sieves are made in the form of a helical surface with spiral discharge nozzles located above the hoppers of the weighing device. In order to reduce the time of unloading the screen and to mechanize the weighing process, the weighing device is made in the form of a platform with tipping bins mounted separately for each fraction, mounted on a lever system, and the balancing end of the lever of the weighing device is suspended on a strain gauge beam with load cells glued on it.

A disadvantage of the known device is the complexity of the design of the weighing device, including a lever system and several tipping bins. This reduces the reliability and compactness of this device.

Closest to the technical nature of the proposed device is a device for determining the granulometric composition of bulk material containing a sampler, funnel, screen, vibrator, weighing, logic, command device and system

executive mechanisms. In order to intensify the screening process, the screen is made in the form of a multifaceted prism, the side faces of which are made in the form of sieve sheets, and the prism is connected with an electric drive and a controlled apparatus. One of the faces of the prism is equipped with a window for loading and unloading samples of bulk material [2].

The disadvantages of this device are the increased time for determining the particle size distribution, since screening is performed simultaneously on only one sieve (prism face) and the low accuracy of separation of the material into fractions, since the material can pass through other faces into the weighing device.

The technical result is an increase in the number of fractions in the separation of bulk material, as well as an increase in the accuracy of determining the percentage of each fraction; increase the compactness and reliability of the device.

The technical result is achieved by the fact that in the device for determining the particle size distribution of bulk material, consisting of a loading hopper mounted on a frame, a screen, a weighing device, a computing device, a command device, a system of actuators, while according to the proposal, the screen is made in the form of a box, in height of which flat sieves are horizontally fixed one above the other, on one side pivotally attached to the box with the possibility of rotation in a vertical plane, size the sieve cells are reduced from the upper sieve to the lower one, the screen box is made in the form of a rectangular pipe, the computing device is connected to the sensors of the weighing device.

The essence of the utility model is illustrated by drawings.

Figure 1, 2 shows a device for determining the particle size distribution of bulk material (General view).

Figure 3-7 schematically shows a device in section. Figure 3 shows the flow of bulk material to the upper sieve and the beginning of the process

fractionation. Figure 4 - end of the process of separation by fractions and determination of the weight of the material in the weighing device. Figure 5 - rash of material from the lower sieve and determining the weight of the material in the weighing device. Figure 6 - rash of material from a medium sieve and determining the weight of the material in the weighing device. Figure 7 - rash of material from the upper sieve and determination of the weight of the material in the weighing device.

A device for determining the granulometric composition of bulk material (1, 2) consists of a loading funnel 1, a screen 2, made in the form of a pipe of rectangular cross section, inside which sieves 3, 4, 5 are pivotally and horizontally mounted, a weighing device 6, made in the form hopper with a tipping bottom. For tipping the bottom of the hopper is designed rotary actuator 7, mounted on the bracket of the hopper. The weighing device 6 is fixed to the frame through three load cells 8, designed to determine the weight. To rotate the screens 3, 4, 5 in the screen 2, rotary actuators 9, 10, 11 are intended. The frame 12 is designed for fastening to it all the main components of the device: a loading funnel 1, a weighing device 6, actuators 9, 10, 11. The screen 2 is suspended from the frame 12 on flexible connections 13 and pivotally connected to the crank mechanism of the vibrator 14.

A device for determining the particle size distribution of bulk material works as follows. The flow of the test bulk material 15 is produced through a loading funnel 1 to the upper sieve 3, after which the screen 2 is given vibrations by means of a vibrator 14 (Fig. 3). Under the influence of oscillations, the bulk material is divided into fractions 16, 17, 18 and 19 depending on the mesh size of sieves 3, 4, 5. The upper sieve 3 has the largest mesh size, the lower sieve 5 is the smallest. As a result, at the end of the separation process (Fig. 4), the largest fraction 16 accumulates on the upper sieve 3, intermediate fractions 17 and 18

accumulate on sieves 4 and 5, and the smallest fraction 19, passing through the lower sieve 5, accumulates in the hopper of the weighing device 6. Then the device determines the weight of each fraction in the following order:

- determines the weight of the fraction 19 accumulated in the weighing device 6. The value is fixed in the computing device (not shown);

- the sieve 5 is tipped over, the fraction 18 is poured into the weighing device 6 and the weight of the material 20 accumulated in it is determined (Fig. 5). The value is fixed in the computing device;

- the sieve 4 is overturned, the fraction 17 is poured into the weighing device 6 and the weight of the material 20 accumulated in it is determined (Fig. 6). The value is fixed in the computing device;

- the sieve 3 is tipped over, the fraction 16 is poured into the weighing device 6 and the weight of the material 20 accumulated in it is determined (Fig. 7). The value is fixed in the computing device;

- using a computing device, the analysis of the recorded values of the weight fractions of the bulk material and the calculation of the percentage of each fraction.

The weighing device 6 can be emptied both after determining the weight of each fraction separately and after determining the weight of all fractions of the bulk material together, depending on this, a certain fraction of the material or several fractions will accumulate in the weighing device 6.

The application of the proposed device improves the compactness and reliability of the device.

Information sources

1. USSR author's certificate No. 368546, IPC G01N 33/42, 1973.

2. USSR author's certificate No. 658443, IPC G01N 15/02, 1979.

Claims (1)

A device for determining the granulometric composition of bulk material, containing a loading hopper mounted on a frame, a screen, a weighing device, a computing device, a command device, an actuator system, characterized in that the screen is made in the form of a box, the sieves of which are horizontally fixed one above the other , on the one hand, pivotally attached to the box with the possibility of rotation in a vertical plane, while the mesh size of the sieve decreases from the upper sieve to the lower b screening is designed as a rectangular tube, and a computing device connected to sensors of the weighing device.