SU1758439A1 - Device for monitoring levels of loose materials - Google Patents

Abstract

Usage: the invention relates to the technique of control and regulation of the level and can be used to automate technological processes in the chemical, engineering and food industry and the industry of building materials. SUMMARY OF THE INVENTION: In the upper position, the interaction element 5 interacts with the position sensor 6, which generates a signal for switching the trigger 7. At the same time, the signal at its direct output disappears and a signal appears at the inverse output, this causes the solenoid 1 to turn off and the inclusion of a time reference on the element 8 time delay. If the product level has not changed, the probe 3 will lower to the lower position and the device will repeat operation. When the level is raised, the probe 3 is in an intermediate position, the position sensor 6 is between the interaction elements and the signal is transmitted to the recording unit. 2 Il.

Description

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The invention relates to a technique for controlling and regulating the level of a product and can be used in the chemical, food industry manufacturing building materials.

A level indicator is known, the disadvantage of which is the kinematic complexity associated with the necessity of converting the rotational motion of the drive into reciprocating movement of the probe; in addition, the probe is fed during the entire operation time of the device, regardless of whether there is a product under the probe or not. This leads to wear of the kinematic elements and reduced reliability due to wear. Continuous contact with the controlled environment, if present, can cause two undesirable effects: if the controlled environment is fragile, the probe will crush it (or destroy it), and if it is shallow and loose, a controlled tamping may occur and level will be lost if present. those. there will be a false signal.

It is also known a device in which the probe makes a reciprocating movement under the influence of a generator. These oscillations occur regardless of whether or not there is a product under the probe in the control zone. If a product is present, the probe acts on the controlled product. At the same time, depending on the properties of the controlled medium, its following disadvantages appear. If the product is brittle, it will be crushed, destroyed in the contact zone of the probe, thereby violating the properties of the product. If the product is small and loose, but prone to clumping, it will be compacted and eventually contact with the product will be lost if present in the control zone. There will be a false signal, i.e. level detection is unreliable. The probe moves even in the presence of the product in the control zone, which leads to excessive wear and heating of the solenoid. Taken together, the reliability of the device and the reliability of the product level measurement are reduced.

The purpose of the invention is to increase the reliability of level measurement.

The goal is achieved by haem, that a device for controlling the level of bulk materials, containing a solenoid with a crust connected to a rigid probe with a first interaction element installed on it, a trigger, a time delay element and a recording Olok, is additionally introduced a second interaction element installed on the probe, and the trigger is designed as a counting trigger, one output of which is connected to the solenoid, and the other through the element of exposure - to the recording unit.

The proposed technical solution is characterized by the presence of the second interaction element located on the probe at a distance of the stroke of the probe from the first element.

0 interaction, as well as the use of quality trigger with a counting input. In addition, the elements included in the technical solution differ from the known device in connection between co-operation, namely: one output of the counting trigger is connected to the solenoid, and the other through the holding element - to the recording device. In this case, the trigger performs the function of a solenoid switch and

0 shutter speed

All-used items are widely known in the art. However, the combination of elements and the characteristics of their connection among themselves gave significant differences in

5 compared with known devices. When the probe first comes into contact with the product, it stops until the product drops, i.e. until the level goes away. This eliminates multiple dynamic effects on the product, resulting in either grinding of the product or loss of contact with the product if the product is crumpled. In case of loss of contact with the product, a box5 will be issued to the team about the absence of the product (if any). In this way, the reliability of the level measurement is improved by eliminating spurious signals of product availability. In addition, the suspension

0 moving the probe when it comes into contact with the product reduces the wear of the elements and the heating of the solenoid, which also increases the reliability of the measurement due to the reduced probability of device failure.

FIG. 1 shows a diagram of the device; in fig. 2 shows different positions of the structure depending on the product level. The device contains a solenoid 1, measles

0 2, the probe 3, the elements A and 5 of the interaction, the sensor 6 position, the trigger 7 with the counting input, the element 8 of the shutter speed and the block 9 registration, the amplifier 10. In FIG. 2 denotes the direction 11 of movement of the probe and the product 12.

As a position sensor, a non-contact switch can be used, such as a BTP or PDS, and the D-flip-flop can be used as a counting trigger. Time delay element

It is a transistor relay of VL series. In the simplest case, the recording unit can be executed, for example, in the form of a signal lamp, activated by the closing contact of the time delay element. The interaction element is a metal plate rigidly fixed on the probe and non-contact, interacting with a position sensor through a magnetic field.

The device contains two elements 4 and 5 of the interaction, located on the probe at a distance equal to the stroke of the probe.

The signal output of the position sensor 4 is connected to the counting input of the trigger 7, the first output through the amplifier 10 is connected to the solenoid 1, and the second to the recording unit 9 via the exposure element 8.

In the initial position (Fig. 2, position), the probe 3, connected to the bark 2, occupies the lower position, the level of product 12 is absent, the probe 3 is not in contact with the product. The interaction element 4 is located within the range of the position sensor 6.

Switching on the circuit causes the solenoid 1 to turn on from the signal from the position sensor 6 through the amplifier 10, the measles 2 connected to the probe 3 begin to move upwards. The solenoid will be powered all the time while the measles is moving upwards. The magnitude of the movement of the core can reach tens of millimeters. In the upper position, the interaction element 5 (position II) interacts with the position sensor 6. The latter generates a signal for switching the trigger 7. At the same time, the signal at its direct output disappears and a signal appears at the inverse output. This leads to the shutdown of the solenoid 1 and the inclusion of a time reference on the element 8 time delay. If the level of product 12 has not changed, or at least has not fallen into the zone of movement of the end of the probe 3, the latter is lowered to the lower position. The mutual position situation depicted in position I is repeated, and the operation of the circuit is repeated, namely: the interaction element 4 will interact with the position sensor 6. The latter switches the trigger 7. Turns on the signal at the direct output of the trigger and the signal on the inverse output disappears. The time delay element is reset, i.e. stop counting time. This element took into account the time of lowering or falling of the core with the probe from the upper position to the lower one. This time is shorter than the time it is set for triggering, therefore, in the absence of a product in the probe area, it will make repeated 5 movements (II), as if probing the presence of a product.

When the product level rises, the situation appears as shown at position 111. In this case, the probe is lowered from the top position. Solenoid 1 is turned off, and there is a signal at the inverse output of trigger 7. In this case, the time delay element counts the time. Probe 3 will occupy an intermediate position. Sensor 6 position in

5 in this case is between the elements 4, 5 of the interaction.

In this position, the probe 3 will remain until the product level is lowered. In this case, the probe will be

0 be at rest, not affecting the product dynamically. The time delay element, counting the set time, gives a signal to the registration unit. The value of the setpoint for the operation of the element of the time hold is somewhat longer than the time for lowering the probe from the upper position to the lower one. If the product is lowered, the device will resume its operation from the position. Thus, when entering the probe 3 in

0 contact with the product, it stops.

Dynamic effects on the product in this

no time. If the product is combustible,

loss of contact is eliminated

with the product and issuing a false alarm about

5 absence of product. This reduces the number of solenoid inclusions and reduces the wear of the rubbing elements of the structure and the heating of the solenoid.

All these properties allow you to increase

0 reliable measurement of the level of the bulk product.

Claims (1)

The claims of the device for controlling the level of bulk materials, comprising a solenoid with a cable connected to a rigid probe, on which the first interaction element, a trigger, a time delay element and a recording unit are installed, characterized in that 0 of measurement reliability, a second interaction element is additionally introduced into it, mounted on the probe, and the trigger is designed as a counting trigger, one input of which is connected to the solenoid, and 5 another through the element of exposure - with the recording unit.