JPH03166111A - Constant flow dispensing device - Google Patents

Abstract

PURPOSE:To enhance and smoothen the accuracy of cutting-out in a specified amount with a constant rate-of-flow delivery device for pulverized/granular material, by supporting a tank and belt conveyor with a plurality of weir-shaped small protrusions arranged dislocated in the width direction and transport direction, interposing a weighing device between these supported tank and belt conveyor, and controlling the running speed so as to attain the target value which is the decremental amount per unit time. CONSTITUTION:On the surface of an endless belt 5, wire-shaped small protrusions 17 are arranged while dislocated in the belt width direction and the transport direction at a constant pitch to form a belt conveyor 2. This belt conveyor 2 and a tank 3 are mounted on a frame 13, and installation is made on a balance 14. This balance 14 measures the weight, which is entered into a control part 16 to determine the decremental amount per unit time, and the resultant is compared with the target value to serve controlling of the running speed of the conveyor 2 so that the decremental amount attains its target value.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a constant flow dispensing device for handling granular raw materials.

Conventional technology In constant flow dispensing devices that handle raw materials that are not powders or fine granules, when a belt conveyor is used as a feeder, the dispensing flow rate can be varied over a wide range by varying the running speed of the belt. be able to. A conventional constant flow dispensing device using a belt conveyor is constructed as shown in FIGS. 4 and 5.

A belt conveyor 2 driven by an electric motor 1 is arranged close to a bottom outlet 4 of a storage tank 3.

When the belt 5 runs, the raw material 6 is cut out from the storage tank 3 and discharged to a subsequent stage. The running speed of the belt 5 is controlled by the control section 7.
It is controlled as follows.

First, the weight of the belt 5 during one moving length is detected by the measuring roller 8, the repeller 9, and the load converter IO, and the running speed of the belt 5 is detected by a speed detection signal P generated from the pulse generator 11 pressed against the belt 5. The control unit 7 calculates the weight signal G of the load converter 10 to obtain the actual dispensing amount per unit time, and controls the control unit 7 so that this approaches the target set flow rate FR.
controls the rotational speed of the electric motor 1.

Problems to be Solved by the Invention With such a conventional configuration, there is a problem that when the raw material to be handled becomes powder or fine particles, the raw material does not penetrate into the belt 5 easily and cannot be cut smoothly from the storage tank 3. be.

Furthermore, in order to improve the biting of powder and fine particles into the belt 5, it is possible to form weir-like protrusions on the surface of the belt 5 at predetermined intervals in the circumferential direction. When the protrusion passes the metering roller 8, a measurement error occurs, making it impossible to accurately dispense a constant amount.

SUMMARY OF THE INVENTION An object of the present invention is to provide a constant flow dispensing device that can smoothly cut out even powdery raw materials and can realize accurate constant flow dispensing.

Means for Solving the Problems The constant flow dispensing device of the present invention supports a belt comparer and a storage tank for supplying raw materials to this belt conveyor via a weighing device, and the amount of reduction per unit time of the weighing device is set as a target. A control unit is installed to control the belt running speed of the belt conveyor so that it approaches the flow rate value, and multiple weir-like small protrusions are arranged on the belt surface of the belt conveyor so as to be offset in the width direction of the belt and in the conveying direction. It is characterized by

The belt of a belt conveyor consists of multiple narrow belts with weir-like protrusions arranged at a constant pitch in the circumferential direction, arranged in parallel and staggered so that the protrusions on each belt are lined up at an angle to the conveying direction. It is preferable to set up and construct it laterally.

Function According to this configuration, the weighing device measures the total weight of the belt conveyor and the storage tank, and the control unit controls the belt running speed of the belt conveyor based on the amount of decrease in the total weight. Even if projections are formed on the belt to improve the biting of the granular raw material, measurement errors will not occur.

Shikamo: The weir-like small protrusions formed on the belt surface of the belt conveyor are staggered in the belt width direction and conveyance direction, so when powder or granules fall from the belt conveyor, the entire belt is It does not fall all at once across the radius, but gradually so that control accuracy does not deteriorate.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. Components having the same functions as those shown in FIGS. 4 and 5 showing the conventional example will be described with the same reference numerals.

FIG. 1 shows a constant flow dispensing device of the present invention, in which a belt conveyor 2 and a storage tank 3 are attached to a frame 13. Guide plates 12a and 12b are provided on the outside of the bottom of the storage tank 3.
is installed. Here, a platform scale i4 as a weighing device is provided, and a frame l3 is installed on a platform 15 of the platform scale l4.

In the control unit IG, the weighed value G of the platform scale 15 and the target set flow rate F3
Using this as an input signal, the electric motor 1 is controlled to control the running speed of the belt 5 of the belt conveyor 2 so that the amount of decrease in the weight value G per unit time approaches the target setting flow WkFR.

The belt 5 is constructed by arranging narrow endless bells 5a to 5d in parallel, as shown in FIG. 3(a). Figure 3 (
As shown in b), weir-like protrusions 17a to 17d are formed at a constant pitch on the surfaces of the endless bells 5a to 5d, and are inclined with respect to the width direction of the belt 6 and the conveyance direction A of the belt 5. The endless belts 5a to 5d are arranged in parallel so that the protrusions 17a to 17d are lined up in the direction of the imaginary line B and are slightly shifted from each other.

With this configuration, the protrusion 18 of the belt 5, which is composed of the protrusions 17a to 17d, can bite into the powder in the storage tank 3, allowing smooth cutting. Also,
Since the protrusions 17a to 17d are inclined with respect to the width direction and conveyance direction of the belt 5, the cut out powder particles do not fall all at once over the entire width of the belt 5 on the discharge side of the belt conveyor 2. It gradually falls from the side C, and a stable constant flow rate can be realized.

In the above embodiment, since the protrusion 1B of the belt 5 is constituted by the protrusions 17a to 17d of the endless belts 5a to 5d, there is an advantage that the belt 5 can be constructed using a general standard product without having to specially manufacture the belt 5. However, without using such a divided belt, the protrusions 17 are formed on the surface of a single belt 5.
The same effect can be obtained by using a material in which a-1 and d are formed.

According to the present invention, weir-like protrusions are provided on the belt surface of the belt conveyor that cuts out the granular raw material from the storage tank, so that the granular raw material can be better penetrated into the belt. This allows for smooth cutting. Moreover,
A belt conveyor and a storage tank that supplies raw materials to this belt conveyor are supported via a weighing device, and the belt running speed of the belt conveyor is controlled so that the amount of decrease per unit time of the weighing device approaches the target flow rate value. Since it is configured as an in-weight type, no weighing errors occur even though weir-like protrusions are provided on the belt surface of the belt conveyor. Furthermore, the protrusions on the surface of the belt of the belt conveyor include a plurality of weir-like small protrusions that are offset in the belt width direction and conveyance direction, so that the cut out powdered raw material can be transferred to one side of the belt. Since it can be dropped gradually from the side and sudden changes in weight values can be eliminated, the accuracy of flow rate control is improved and uniform dispensing can be achieved.

According to the second aspect of the present invention, it is possible to realize the above-mentioned belt using a standard product without having to specially manufacture the belt.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the constant flow dispensing device of the present invention, Fig. 2 is a plan view of the same device, Fig. 3 is a plan view of the belt conveyor of the same device and a sectional view of the main parts, The figure is a configuration diagram of a conventional constant flow dispensing device, and FIG. 5 is a sectional view of a main part of the device. 2... Belt conveyor, 3... Storage tank, 4... Bottom outlet, 5... Belt, 5a-5d... Narrow belt, 17a-17d... Protrusion, A... Transport direction.

Claims (1)

[Claims] 1. A belt conveyor and a storage tank for supplying raw materials to the belt conveyor are supported via a weighing device, and the belt conveyor is adjusted so that the amount of decrease per unit time of the weighing device approaches the target flow rate value. A constant flow dispensing device that is equipped with a control unit that controls the belt running speed of the belt conveyor, and a plurality of weir-like small protrusions are arranged on the belt surface of the belt conveyor so as to be offset in the width direction of the belt and the conveyance direction. 2. The belt of the belt conveyor is arranged in parallel with a plurality of narrow belts with weir-like protrusions arranged at a constant pitch in the circumferential direction, and the protrusions of each belt are aligned in a direction inclined to the conveying direction. 2. The constant flow dispensing device according to claim 1, wherein the constant flow dispensing device is configured by being arranged as follows.