SU1008623A1 - Belt-conveyer weigher - Google Patents

Abstract

CONVEYOR BALANCES containing a pneumocamera, a transducer, a choke and a recording device, characterized in that, in order to improve the accuracy by providing a direct conversion, they are equipped with an open-type camera mounted on the frame, which opens its open surface to the lower surface of the pneumocamera, connected with the rack, while the open-type chamber is connected via a choke and pneumatic chamber to the compressed air line, and the converter, made in the form of a frequency sensor, is connected KTA between open-type chamber and the pneumatic chamber, its inputs coupled to pneumatic chamber and open chamber outlet .a - with registrirukitsim device.

Description

The invention relates to devices for interoperational weighing and mass control, as well as for determining the consumption of piece and bulk cargo both per unit time and total. 5

Known carpet scales comprising a conveyor and a measurement system (1].

However, due to the fact that the transportation of cargo is carried out at 10 constant contact with the bearing surface, particles stick to the latter. Such devices contain a large number of movable elements, which leads to rapid wear and change of results. measurements in time. In addition, the presence of moving parts increases the safety requirements for their operation.

Closest to the proposed technical essence are conveyor scales containing a pneumatic chamber, a converter, a throttle and a recording device G2].

However, in the known device, the mass of the cargo is judged by the results of indirect measurements of the rapidly varying amount of air pressure under the part, t’e. converters of instantaneous values of pressure into an electrical signal are used, which introduces additional errors in the measurement results.

The purpose of the invention is to increase accuracy by providing direct conversion.

This goal is achieved by the fact that the conveyor scales containing a pneumatic chamber, a converter, a throttle and a recording device are equipped with an open-type camera mounted on the bed, adjoining. with its open surface to the bottom surface of the air chamber pivotally connected to the bed, while the open-type chamber is connected via the throttle and pneumatic chamber to the compressed air line, and the converter, made as a contact opening frequency sensor between the open-type chamber and the pneumatic chamber, is connected by its inputs with a pneumatic chamber and an open-type chamber, and with an output with a recording device. ''

The drawing shows a conveyor scale, a diagram.

The conveyor scales contain a pneumatic chamber 1 with a perforated bearing <(surface 2, articulated bearings 3, a pneumatic vibrator having 60 open-type chamber 4, a throttle 5, and a transducer 6 in the form of a frequency measurement sensor connected to # with a recording device 7, and transporting cargo 8.

The device operates as follows.

In the pneumatic chamber 1, when supplying the cart, the spirit from the line creates a pressure close to that necessary for the formation of an air gap under the transported cargo 8, but slightly less. Therefore, the load 8 at the initial moment lies on the perforated surface 2. As a result of supplying air from the highway under constant pressure through the throttle 5 to the open chamber 4, the pressure in the latter increases and reaches a value at which its total effect from the side of the open chamber 4 to the lower the surface of the pneumatic chamber 1 is equal to the force of gravity acting on the load 8 together with the pneumatic chamber 1.

At this moment, the pneumatic chamber 1 pops up, i.e. a gap is formed between its lower surface and the upper end of the chamber 4, into which air rushes from the chamber 4. The pressure in the chamber 4 drops sharply, and the pneumatic chamber 1 again rests its lower surface on the end of the chamber -4. Then, the process of filling the chamber with air, ascent of the pneumatic chamber 1, emptying of the chamber 4 and lowering of the pneumatic chamber 1 is repeated continuously during measurement.

As a result of vibrations of the pneumatic chamber 1, the direction of which is given by the hinged supports 3, the load 8 moves due to the total driving force of the vibrations and air jets along the perforated surface 2. The transport speed is uniform.

, At a constant flow rate (pressure) of air supplied through the throttle 5, the oscillation frequency of the pneumatic chamber 1 is proportional to the mass of the transported cargo 8. The transducer 6 senses these vibrations, and sends a signal proportional to the mass of the transported cargo 8 to the input of the recording device 7.

I.

The use of conveyor scales allows to increase the accuracy of measurements by 0.5% due to the fact that the converter in the form of a frequency sensor measures not the pressure value, but the presence or absence of contact.

VNIIIPI Order 2328/54 Circulation 641 Subscription

Branch of PPP Patent '’, Uzhgorod, Project 4,

Claims (1)

CONVEYOR SCALES containing a pneumatic chamber, a converter, a throttle and a recording device, characterized in that, 'in order to increase accuracy by providing direct conversion, they are equipped with an open' type camera mounted on the frame adjacent its open surface to the lower surface of the pneumatic chamber / pivotally connected to the stein, while the open chamber through the throttle and pneumatic chamber connected to the compressed air line, and the Converter, made in the form of a sensor of the frequency of opening contact between to an open chamber and a pneumatic chamber, with its inputs it is connected to a pneumatic chamber and an open chamber, and the output to a recording device. 00.