KR810001295B1 - Installation for the systematic supply of the ball of a ball mill - Google Patents

Abstract

An appts. for systematically supplying balls into a ball mill, which is positioned over the feeding chute of the ball mill, comprises an opening formed at its bottom, a hopper(34) with predetermined balls, a port(46) for closing the opening, and a control means which is connected operatively to the weight measuring means of the material to be milled so as to control the port(46). After predetermined material is milled, the port is opened and then balls are fed into the ball mill.

Description

System for systematically supplying bowl grinder

1 is a schematic view of the wet grinding equipment according to the present invention.

2 is a cross-sectional view of the filling device of the bowl.

3 is a plan view of the apparatus of FIG.

4 is a schematic view showing the operation of the filling device of the bowl.

The present invention relates to a device for systematically supplying a bowl of a bowl grinder.

It is well known that the efficiency of a bowl grinder is closely related to optimally maintaining the load on the grinding body. The load is made as a bowl with several diameters, the number and size of the bowls being selected accurately according to the nature of the material to be crushed, the diameter of the mill and the rotational speed of the mill. During operation, the bowl must be fed regularly to rebuild the original load to wear out.

In many current installations, since the supply of the bowl is not systematic, the amount of work done in the mill decreases, the mass of the bowl decreases, the load circulating in the separator increases, the porosity of the bowl decreases, and the material is excessively crushed and consumed. Time is increased.

An object of the present invention is to systematically mechanize the process of supplying a bowl of a bowl mill.

The apparatus of the present invention compensates for wear of a flow rate measuring device of a material having an integrator which gives two signals at systematic time intervals corresponding to the injection of a predetermined number of tonnage material into the grinder and the signal after sending out the signal. And a filling device controlled by said signal to inject a bowl of load determined to be into the mill.

The flow rate measuring device of the material consists of a belt conveyor scale which is coupled to the feeder of the mill. In the case of wet grinding in which the material entering the mill is pulp, the mass of the material is obtained from volume and density. The flow measuring device has a flow meter and a density meter disposed in the feed or discharge pipe of the grinder.

The filling device of the bowl is configured as a tank positioned on the feed passage of the mill and closed at the base by a pot whose opening is controlled in accordance with a signal sent from the flow measuring device. While filling the bowl twice in the mill, the tank is filled with a certain mass of bowl by a suitable control device such as a traveling crane installed in the container.

To reduce the number of fillings the tank is divided into several sections which are rotatable about a vertical axis and which are guided above the feed passage of the mill by the rotation of the tank by radial bulkheads. When the divider is positioned on the feed passage of the grinder it is closed at its base by a port opened by the device controlled by a signal sent by the flow measuring device. After one partition is emptied, the tank is rotated to locate the other partition over the passageway and awaits the next signal. When all the segments are empty, they are refilled with a certain mass of volume.

DETAILED DESCRIPTION OF THE EMBODIMENTS One embodiment of the present invention is described below with reference to the accompanying drawings.

The installation shown in FIG. 1 has a rod mill 10 and a bowl mill 12. The rod mill is supplied from the hopper 14 by a belt conveyor to which the belt conveyor scale 16 is connected. One function of this scale is to determine the flow rate injected into the mill and the other function is described below.

The material exiting the grinder 10 is fed into the cyclone 20 by a pump 18 and a large particle injected into the bowl grinder 12 by a passage 22 and a portion of the liquid carrying the fine particles in the cyclone. It is divided into dense portions of liquid. The grinder 12 is driven by the motor 24 and the power meter 26 measures the power required for the grinder.

The pulp coming from the mill 12 is fed into the cyclone 30 by the pump 28 and has a light portion with particles that are ground to the required size and a dense portion with very large particles back into the mill. Are separated.

The filling device of the bowl consists of a tank 34 having a vertical axis which is located on the feed passage of the grinder and has a circular cross section and which is rotated on the chassis 36 via a roller 38 so that the pivot 40 is a tank. Is placed in the center of the chassis. The tank is rotated by the hydraulic motor 42.

The bottom of the tank is conical and the tank is divided into four sections by radial partitions 44. Each divider has an opening that is normally closed at the base by port 46 of the guide. A hydraulic jack 48 installed in a fixed position on the chassis opens the pot 46 when the corresponding opening is positioned on the hopper 50 and connected to the feed passage of the grinder. For this purpose, each port is provided with a protrusion 52 which engages with the guide member of the member 54 fixed at the end of the rod of the jack when the corresponding split is positioned over the hopper 50.

The tank is filled regularly by a traveling crane 56 provided with a container 58 having an opening.

The mass of the bowl in each splitting part and the number of fillings of the bowl in the mill are selected to compensate for wear of the bowl between two fillings, depending on the nature of the material being crushed and the flow rate of the material.

In operation, the filling device starts to move by operating the belt conveyor scale. All divisions of the tank have a certain mass of volume corresponding to a given tonnage of material. When the tonnage material is injected into the grinder, the scale 16 supplies a command signal for operating the hydraulic device 60 for supplying pressure oil to the motor 42 and the jack 48. When the hydraulic pressure reaches a predetermined value, the jack 48 opens the pot 46 of the partition located on the hopper 50 and lowers the bowl of the partition into the grinder through the supply passage. The jack closes the pot again after a predetermined time period controlled by the timer. Closure of the pot is controlled by the detector 62 in close proximity of the tank to rotate only when the pot is completely closed.

회전 시킨다. 탱크의 정지는 근접한 탐지기(64)에 의해서 제어된다.The motor 42 is then activated to open the tank

Rotate The stopping of the tank is controlled by the proximity detector 64.

The device is ready for new bowl filling in the grinder to operate upon receipt of a new signal from scale 16 after the predetermined tonnage of material has entered the grinder upon release of the signal.

Once the four divisions of the tank have been emptied they must be refilled. In order to avoid accidental opening of the pot during recharging, manual control removes the command from the scale during that period, but immediately after refilling, the command from the scale is stored and executed.

Since the power consumed by the grinder 12 varies among other variables, in particular depending on the variable state of the load, it is possible to check whether the load is optimal by measuring the power by the power meter 26 and in some cases the bowl of the grinder. The number of times of filling can be changed as required.

Instead of using a scale to measure the flow rate of the material to be pulverized, for example, flow meter 66, density meter 68 and a calculator for calculating and integrating the flow rate of the material into or out of the crusher 12 The flow rate can be determined by measuring the volume and density of the pulp entering or leaving the furnace.

The present invention is applied to a grinder of the type using a bowl having any shape or dimension capable of filling by gravity, in which the grinding body is not necessarily spherical.

Claims (1)

In a known device having a device for measuring the mass of material to be pulverized, a tank 34 having an opening formed at its bottom and located on a supply passageway 22 of a known pulverizer 12 and having a predetermined mass of volume 34 And a device for injecting a predetermined mass of the bowl into the grinder comprising a pot 46 for closing the opening and a control device 48 operatively connected to the measuring device and controlling the pot. A device for systematically supplying a bowl of a bowl mill, wherein the pot is opened when the material is ground and the bowl is injected into the mill.

Images