SU757851A1 - Continuous-action flour metering apparatus - Google Patents

Description

The invention relates to a technique of bakery production and can be used in other sectors of the national economy for dispensing bulk materials. five

More specifically, this invention relates to continuous dispensers having a hopper, a separate belt feeder, a load-receiving conveyor with a frame in the form of a weight lever, a non-direct-action block controller and an actuator in the form of an electrically operated damper.

Known dispensers with built-in or a separate belt, vibrating, auger or other feeder, a load-receiving conveyor connected with a weight balance mechanism or having a frame made in the form of a weight lever, a block regulator of no direct action and an actuator in the form of a damper with the drive, the vibromotor, etc. "Π), [2]. 25

Dispensers of this type have relatively low reliability due to frequent switching off when the water feeder. The closest in technical essence to the invention

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is a continuous flour metering unit containing a bunker, a belt feeder, a weight-receiving weighing conveyor, a non-direct-acting proportional unit controller and an actuator in the form of a main motorized damper [3].

The disadvantage of this device is that changes in the performance of the feeder can be of a rapidly changing nature and will create dynamic loads on the weight mechanism of the dispenser. Because of this, the results of measurements of the load and the corresponding signals from the regulator may have significant deviations from the values corresponding to the actual mass of the product located on the load receptor of the metering device.

The motorized damper may therefore unnecessarily or insufficiently change the performance of the feeder, which may lead to a decrease in metering accuracy.

Dynamic nature of change

loads may also cause unnecessarily frequent activation of the regulator

and motorized gear motor valve that impairs operation

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• 757853

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dispenser reduces its reliability and

life time.

The aim of the invention is to increase the reliability, durability and accuracy of the device. This goal is achieved by the fact that the main flap is wider than the outlet of the feeder, and between it and the hole contour there are two additional flaps, each of which is equal to half the remaining part of the outlet of the feeder and is electrically driven, and one is normally closed and the other is normally open, and the metering controller block is equipped with a time relay for switching on the main valve only after one of the two additional valves is activated.

The invention is illustrated in the drawing, which schematically shows a general view of the proposed flour metering device of continuous action (actuator, view along arrow A, section BB, plan view of contactless signaling devices of the weight conveyor of the metering unit).

The dosing unit consists of a receiving bin for flour 1, a belt feeder 2 driven by a gear motor 3, a weighing conveyor 4 with a drive 5, a conveyor frame with a prism 6 rests on a rack with a cushion 7, the main scale 8 with a movable weight 9 and an auxiliary scale 10 with weight 11, equilibrium index 12, adjustment balance 13 and a block of four metal flags 14, 15, 16, 17. Scales 8 and 10 are graduated in units of productivity (for example, kg per minute). On a fixed base of the dispenser, an equilibrium indicator 18 with limiters of oscillation of the weighing conveyor and a block of two pairs of contactless signaling devices 19, 20,21, 22 are fixed.

The metering actuator consists of two additional electromagnetic valves 23 and 24, of which one is normally closed and the other is normally open (the stroke of the valves can be adjusted) and one main valve 25 with a screw rod 26, a worm pair 27 and a reversible gear motor 28. A removable handle 29 is mounted on the motor shaft.

In the block-regulator (not shown in the drawing) there are two time delay relays.

The checkbox 14 is designed to work in tandem with the detector 19, which serves to turn on the normally-closed damper 23. The checkbox 15 paired with the detector 20 serves to control by means of a time relay

motor 28 in the direction of opening the valve 25. Checkbox 16 with a signaling device 21 serves to turn on a normally open valve 24. Checkbox 17 with a signaling device 22 is controlled by means of a time delay relay to turn on the electric motor 28 to close the valve 25.

Flags 14 and 15 are set relative to the signaling devices so that they can almost simultaneously cross the signaling devices 19 and 20, and the flags 16 and 17 when the weight conveyor is turned in the opposite direction, can simultaneously cross the signaling devices 21 and 22.

The proposed dispenser operates as follows. Weights 9 and 11 set and handle 29 adjust the dispenser to the desired performance. The setting is considered complete when, with the feeder turned on and the weighing conveyor, the equilibrium indicator 12 is the same or will fluctuate within a small range relative to the equilibrium indicator 18. (Then the block controller is turned on, and the dispenser is then operated in automatic mode.

When deviating in the direction of decreasing performance beyond the permissible value, the equilibrium indicator 12 rises, and flags 14 and 15 will go down and cross sensors 20 and 19. Gate 23 will open and the time relay will turn on.

If the signal was short-lived, i.e. the load change was dynamic, then immediately after removing the signal, the damper 23 will take its normal position.

If the signal was long enough, the time relay will work and the drive motor 28 will turn on for the proportional controller, which will open the valve 25 until the specified performance value is restored.

If the dispenser performance deviates upward, it will recover to the specified value. The combination in one metering unit of two control systems — positional and proportional, which each can operate in its own control range and compensate one dynamic and the other static deviations, allows for each system to achieve optimal working conditions, improve metering accuracy, increase reliability and service life. dispenser.

Claims (1)

Claim Continuous flour dosing unit, -containing bunker, belt feeder, weight receiving trance proportional block 757851 6 The actuator is not directly operated and the actuator is in the form of a main motorized damper, characterized in that, in order to increase the reliability, durability and accuracy of the device, the main damper is width less than the outlet of the feeder, and between it and the hole contour there are two additional dampers , each of which is equipped with an electromagnetic drive, one of which is normally closed and the other is normally open, while the metering controller block is equipped with a time relay to turn on the main flap ko after triggering one of the two additional dampers.