SU580457A1 - Weighing mechanism and batch selector of metering apparatus - Google Patents

Description

one

The invention relates to the field of weighing equipment, and more specifically to automatic portioning, weighing dosing devices for the dosing of sand, rubble, cement and other bulk materials in the preparation of various mixture solutions in the field.

Metering devices 1 are known in which input valves are used to regulate the flow of material into containers, or to eliminate the effect of uneven receipt of material by loading it into the hopper to a weight close to the maximum, and then automatically filling it to the exact weight. This complicates the design of devices, increases their cost and makes them difficult to use in the field.

To simplify the design and provide reliable operation in the field, the well-known friction brake has been used as a weight mechanism and unit control, for example, for automatic metering of the portions of the components during the preparation of mixtures in the field.

FIG. 1 shows a schematic of a two-block brake with an electromagnet; in fig. 2 - Kinematic diagram of the device using this brake.

The shoe brake (for example, type TKT), as usual, is closed by spring 1 and is opened by means of an electromagnet 2 fixed on lever 3. The armature of electromagnet 4 is turned around hinge 5 during a short circuit, presses the rod 6 and, overcoming the compression force of spring 1, produces disinhibition. The spring force S required to close the brake, directed along the rod 6, is determined by the formula

about Mf

  B

where MT is the calculated braking torque (equal to the torque on the axis of the brake pulley);

D, a, b - geometrical dimensions of the brake (respectively, the diameter of the brake pulley and the shoulders of the lever); | 1 - the coefficient of friction brake lining of the pulley; TI-efficiency lever system.

Since D a, b, c and t i for each brake are constant values, then M is proportional to S and depends only on the amount of compression of the spring 1. The device operates in the following way.

The weight indicator 7 is set by compressing the spring 1 on the scale 8 to the required weight of the material, which provides the braking torque on the shaft 9 necessary to hold the bolt 10 in the closed position (when the material weighs less than the required weight). The material entering the bunker 11 (when the required weight is reached) lowers the bolt 10, turns the braked shaft 9, which, acting on the track switch 12 of instantaneous action, simultaneously disconnects the drive of the power supply device 13 and turns on the electromagnet 2 to release. The supply of material to the hopper 11 is stopped, the material is poured out. The shutter 10, freeing itself from the material, returns to its initial position under the action of the counterweight 14, turns the shaft 9, which sets the switch 12.

Claims (1)

Invention Formula The use of the friction brake as a weighing mechanism and the setting unit of the portions of the dosing devices. Sources of information taken into account in the examination 1. Copyright certificate № 356476, cl. G OIG 13/34, 1970. ///// / xx / 12 t FagL 15 Phi. 2