RU2401993C1 - Device for controlling level of granular materials - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: device for controlling the level of granular materials has an insulating cover 1, outlet 2, beam 3, axle 4, counterweight 5, magnet 6, magnetically operated contact (MOC) 7, protective cover 8 attached to the wall 9 of the controlled container 10.

EFFECT: simple design and increased technological reliability owing to controlled action of granular material on the detection unit which excludes random factors.

2 dwg

Description

The invention relates to measuring technique and can be used in various industries to control the level of bulk materials in containers.

A known level indicator of bulk materials (USSR author's certificate No. 1728669, G01 23/00 19/10, 1989), containing freely suspended and forming an electrical contact pair - a sealed enclosure and a pendulum located inside the enclosure and mounted on the lid, connecting wire, made in the form of a bracket mounted on the outside of the housing cover and passing through the window of an O-shaped ferromagnetic core with a winding inserted into the electric circuit.

The disadvantages of the known device are the design complexity and lack of technological reliability. The shedding of bulk material along the generators of the formed cone is random in nature (by separate elementary flows), therefore, there is the possibility of particles falling under the bottom of the body (contact pair) from neighboring (relative to the axis of the body) shed flows, which prevent it from deflecting under the influence of the expected flows. These particles, depending on the granulometric composition of the bulk material, humidity, the angle of internal friction, the dynamics of filling the controlled capacity, can create conditions for self-braking of the housing, which reduces the technological reliability of the proposed device.

A device for controlling the level of bulk materials (Dmitrenko L.P. Devices for controlling the level of bulk materials. M: Energy, 1978, p. 11, Fig. 4), containing a plate located on the shaft and fixed in position by a screw, the shaft sleeve mounted on the wall, a counterweight with a shielding plate, located on the opposite end of the shaft, a non-contact position sensor (selected as a prototype).

The known device for controlling the level of bulk materials also has a design complexity and low technological reliability due to the need to adjust the required position of the plate relative to the crumbling flows of the controlled material, since the angle of repose of the material varies depending on humidity, particle size distribution, internal friction coefficient and filling dynamics controlled capacity. In addition, the possibility of particles getting under the plate from neighboring crumbling flows, which create an obstacle to its deflection, is not ruled out.

The purpose of the invention is to simplify the design and increase technological reliability.

This goal is achieved by the fact that in the device for controlling the level of bulk materials containing a wall, a plate and a counterweight, according to the invention, the wall is made in the form of an insulating casing, in which a tap is integrated, overlapping in the lower part of the plate, made in the form of a rocker with the possibility of rotation in vertical the plane, at one end of the rocker arm there is a magnet interacting with a magnetically controlled contact, and a counterweight.

The invention is illustrated by drawings, presented in figure 1 and figure 2. Figure 1 shows the position of the rocker when filling a controlled tank. Figure 2 shows the position of the rocker at the time of disconnection of the flow of bulk material into a controlled tank.

A device for controlling the level of bulk materials contains an insulating casing 1, a branch 2, a rocker 3, an axis 4, a counterweight 5, a magnet 6, a magnetically controlled contact (MUK) 7, a protective casing 8, attached to the wall 9 of the monitored container 10.

A device for controlling the level of bulk materials works as follows. As the filling of the controlled container 10 with bulk material is completed by means of, for example, a spiral conveyor (not shown), it, falling along the formed cone, enters the outlet 2, which is built into the insulating casing 1 at an angle close to the angle of repose of the bulk material. At the initial moment of filling of branch 2, it is blocked in the lower part by the left shoulder of the rocker arm 3 (Fig. 1), pivotally mounted on the axis 4 and pushed against the branch 2 by the counterweight 5. At the next moment, the static and dynamic effects of the bulk material entering the branch 2 on the right the arm of the rocker arm 3 overcomes the pressing force, the rocker arm 3 begins to rotate (clockwise) around axis 4 (figure 2). In this case, the magnet 6 approaches the magnetically controlled contact (MUK) 7, which, closing the contacts, closes the control circuit disconnecting the supply conveyor. Material from branch 2 pours out, rocker 3 under the action of counterweight 5 rotates around axis 4 (counterclockwise) and returns to its original position. The beam 3 with a magnet 6, a counterweight 5 and a magnetically controlled contact 7 are placed in a protective casing 8 attached to the wall 9 of the monitored tank 10, which prevents them from external influences.

The presence of an insulating casing 1 with an integrated outlet 2 in the device for controlling the level of bulk materials eliminates the accidental effects of particles of bulk material on the sensing element - rocker 3, which simplifies the design and improves process reliability.

Claims (1)

A device for controlling the level of bulk materials containing a wall, a plate and a counterweight, characterized in that the wall is made in the form of an insulating casing, in which a tap is integrated, overlapping in the lower part by a plate made in the form of a rocker arm with the possibility of its rotation in the vertical plane, on one from the ends of the beam are placed a magnet interacting with a magnetically controlled contact, and a counterweight.

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