JPH05139543A - Constant amount carrying device - Google Patents

Abstract

PURPOSE:To obtain a device to carry a constant amount of various kinds of granular materials with high accuracy by means of a feeder employing a belt conveyor. CONSTITUTION:A feeder 4 employing a belt conveyor 3 is provided at an lower end opening part 2' of a supplying hopper 2 mounted on a frame 1, a material transfer port 5 is opened to the material transfer side of the hopper 2, a material controlling plate 6 which is inclined downward facing from the outer side to the inner side of the transfer port 5, and a material upper surface leveling gate 7 is provided on the material transfer side of the material controlling plate 6 so that the gate 7 and the material controlling plate 6 may be supported in an elevatable and slidable manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material quantitative transport device suitable for a metering device for various powder and granular materials.

[0002]

2. Description of the Related Art Conventionally, a quantitative weighing device with a transportation device carries out intermittent transportation and feeding only at a belt speed. In order to shorten the weighing time, the transportation amount is increased and the belt speed is reduced near a fixed amount. However, even in this case, the material falling from the belt is wavy, and the fluttering (pulsation) causes variations in the quantitative value. Even if the thickness of the transportation material is thinned, the variation in the transportation amount causes the weighing accuracy to be expected. This is not possible, and the weighing time is long and inefficient, so far it has not been applied so much, and it is only applied to the continuous weighing device.

However, in the belt scale, the maximum weight is 30
Approximately 80% is the measurable range, and 30% or less of the transportation amount is dead zone and cannot be measured.
If it becomes 00%, it tends to be over, and high accuracy cannot be obtained. In short, weighing accuracy can be obtained with a smooth linear quantitative transportation within the weighing range centered on 50%. Although the gentle change in the transport amount is detected, the device cannot follow the rapid change in the transport amount and the measurement is impossible, which causes an error. In raw material mixing and metering, speed control is performed with a constant transport rate, but if it is more or less than the set value, it takes time to approach the set value even if the belt speed is increased or decreased, resulting in poor mixing accuracy. ..

In order to solve this, it is necessary to carry out a certain amount of transportation, but conventionally, a dam plate-shaped adjusting plate is provided in the upright direction on the upper edge of the material transfer port of the supply hopper to block the upper part of the material transfer port. A mechanism was used to pull out the material in the hopper with the belt conveyor in the closed state.

However, in this material drawing mechanism, the drawn material on the belt is narrowed down to the area of the transfer port by the adjusting plate (weir plate) and then drawn out, so that the material at the transfer port (outlet) has various frictions. Occurs, and there is no escape place for the material left in the hopper, which causes bridging or unstable transportation, resulting in a decrease in weighing accuracy.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to accurately carry out quantitative transportation to a weighing device by means of a feeder provided by a belt conveyor provided at the lower end opening of a material supply hopper.

[0007]

In order to achieve the above object, the present invention provides a feeder with a belt conveyor at the lower end opening of a supply hopper provided in a machine frame and opens a material transfer port on the material transfer side of the hopper. Then, a material cutting plate inclined downward from the outside of the transfer port is provided, a material upper surface leveling gate is provided on the material transfer side of the cutting plate, and the gate and the cutting plate are moved up and down. It is composed of a fixed-quantity transportation device which is slidably adjustable.

[0008]

In the present invention, the material 8 is put into the supply hopper 2,
When the belt conveyor 3 is rotated in the direction of arrow a, the material 8 in the hopper 2 is cut out onto the belt 3'of the conveyor 3 by the leading edge 6'of the material cutting plate 6 and the belt 3 '.
Will be transferred with.

The upper surface of the material 8 cut out on the belt 3'is transferred by forming wavy unevenness, and the wavy unevenness is leveled by the lower edge 7'of the material upper surface leveling gate 7, and in that state. The conveyor 3 drops downward from the end thereof.

The cut-out plate 6 and the leveling gate 7 can be adjusted up and down to correspond to the type of the material 8 and can be switched from large transportation (FIG. 2) to small transportation (FIG. 4).

[0011]

EXAMPLE A supply hopper 2 having a lower end opening 2'is provided in a machine frame 1, and an upper transfer belt 3'of a belt conveyor 3 is formed immediately below the opening 2'to form a feeder 4.
The lower edges 9'of the guide plates 9, 9 provided on both sides of the opening 2'are arranged in contact with the upper surface of the belt 3 '.

On the material transfer side of the hopper 2, a material transfer port 5 communicating with the opening 2'is opened, and a material cutting plate 6 inclined downward from the outside of the transfer port 5 toward the inside thereof. Provided, the tip edge 6'of the cutout plate 6 is arranged directly above the belt 3'in the opening 2 ', and is moved up and down in the tilt direction by the tilt cylinder 10 (double double-ended cylinder) provided in the machine frame 1. The height of the leading edge 6'can be adjusted by sliding.

On the material transfer side of the cutout plate 6, a material upper surface leveling gate 7 is provided at a predetermined interval. The gate 7 is provided in the machine frame 1 in a vertical or inclined state, and the upper end portion is connected to a cylinder 10 '(double-ended cylinder) so that the cylinder 10' can move up and down.
By adjusting the level of the lower edge 7 ', it is possible to even out the unevenness of the upper surface of the material 8 on the moving belt 3'to a flat surface.

The tilt cylinder 10 of the cutting plate 6 can be horizontally moved and adjusted from the solid line position in FIG. 1 to the imaginary line position, whereby the cutting plate 6 can also be moved horizontally. Corresponds to the type of material 8. In that case, a slide-adjustable leak-proof plate 11 is provided for closing the gap between the upper edge of the material transfer port 5 and the cut-out plate 6 (FIG. 6,
(See FIG. 7).

If the leveling gate 7 is installed immediately after the cutting plate 6 as an installation condition, there is no escape place for the material 8 leveled up by the gate 7 and raised, so that it is necessary between the leveling gate 7 and the cutting plate 6. A different interval T is provided (see FIG. 3).

As shown in FIG. 2, when the start switch is turned on, the cutting plate 6 and the leveling gate 7 are simultaneously moved to the cylinders 10 and 1.
By the operation of 0 ', the cutting plate 6 forms the large supply port 12, the belt 3'rotates in the direction of the arrow a, and the material 8 is mass-transported.

At this time, the material 8 in the supply hopper 2 is supplied onto the belt 3'and, at the same time, is cut out obliquely by the cut-out plate 6 to have a certain transport amount and is transported in large quantities. The cross-sectional shape of the material 8 on the belt 3'is trapezoidal (trapezoidal), both side surfaces are formed by guide plates 9 and 9 provided on both sides, and the thickness (height) is made uniform by the cutout plate 6. The material 8 is transported, and the convex portion on the upper surface of the material 8 is scraped by the leveling gate 7, and the concave portion is filled and arranged to be finished, and the material is mass-transported from the end portion of the belt 3'to the quantitative weighing device 14 shown in FIG.

As shown in FIG. 3, the cylinders 10 and 10 'are actuated by the large-quantity completion signal and only the cutting plate 6 is lowered,
A small amount supply port 12 'is formed and switched to small amount transportation.
On the belt 3 ', a large amount of transportation by the leveling gate 7 and a small amount of transportation by the cutout plate 6 are performed. The leveling gate 7 leveles the upper surface before the mass transportation passes, and after passing, the gate 7 is automatically lowered by the operation of the cylinder 10 'to level the upper surface of the small amount transportation.

In FIG. 4, the cutting plate 6 cuts out the material 8 from the small supply port 12 'to a thickness of a small amount and supplies it to the belt 3'. Due to this cutting, the material 8 is supplied to the belt 3 ′ without any trouble such as friction generation or cross-linking phenomenon in the material transfer port 5, the upper surface of the transportation amount is leveled, and the convex surface is scraped by the gate 7 to fill the concave surface. A trapezoidal or rectangular cross section is formed, and a fixed small amount of transportation is transported to the quantitative measuring device 14, momentarily stopped when the quantitative measurement is completed, and the next measurement is started.

By using speed control together with this device, accuracy and efficiency can be improved. FIG. 5 is a cross section of the trapezoidal supply amount cut out by the cut-out plate 6, and in this form, it is gradually quantitatively transported from a large amount to a small amount and supplied to the quantitative measuring device 14.

6 and 7 show a state in which the cutting plate 6 is moved in the horizontal direction in order to form the large and small supply ports 12 and 12 'which are suitable for the characteristics, efficiency and accuracy of the material. In FIG. 6, the large supply port 12 is formed by the movable support base 13 of the cylinder 10, which is suitable for a material having poor fluidity or a large transportation amount,
By enlarging the supply port 12, cross-linking of the material is eliminated and the transportation amount is large, so that the belt speed is naturally high and the transportation amount is thick. Further, in FIG. 7, a small supply port 1 for small transportation with good fluidity.
It shows a state in which 2'is set.

The present invention is not limited to the apparatus shown in the drawings. For example, in a continuous transportation metering apparatus, the control power of the cutting plate 6 shown in the figure is replaced by a control motor from the cylinder 10 to control the variation of the transportation amount momentarily. If proportional control is performed, a fixed amount of transportation can be performed, and highly accurate transportation measurement can be obtained. In the quantitative measuring device 14, the mass transportation supply port 1 suitable for the material and the efficiency.
If 2 is set, the supply port is automatically controlled and cut out according to the large and small stepwise supply amount, and the cutout plate 6 is automatically controlled by the supply port 12 and the supply amount, and then a fixed amount cutout and top surface equalization. After that, it is transported to the weighing device 14 to improve the weighing accuracy. Other similar measuring devices can be used with the same basic mechanism.

Reference numeral 15 in the drawing is a limit switch, 16 is a variable speed motor by an inverter, 17 is a belt driving roller, 18 is a floating roller, 19 is a belt lower surface supporting plate, and 20 in FIG. 8 is for measuring the amount of belt movement. Rotation sensor (PG ... Pulse generator), 21 is load cell, 22
Is a measuring roller, 23 is a calculator, and 24 is a load cell 21.
Is an indicator.

[0024]

Since the present invention is configured as described above, the feeder 4 by the belt conveyor 3 provided at the opening 2'of the lower end of the supply hopper 2 can accurately carry out quantitative transportation of large and small or large, medium and small amounts stepwise. You can

[Brief description of drawings]

FIG. 1 is a side view showing a quantitative transportation device of the present invention.

FIG. 2 is a side view of a mass transportation state.

FIG. 3 is a side view of a state in which mass transportation is shifted to small transportation.

FIG. 4 is a side view of a small amount transportation state.

FIG. 5 is a front view of FIG. 1 as viewed from the right side.

FIG. 6 is a side view showing a state where a cutting plate is raised.

FIG. 7 is a side view showing a state where the cutting plate is lowered.

FIG. 8 is a side view of a quantitative transportation state in which the moving speed of the belt is controlled based on the fluctuation of the transportation amount.

FIG. 9 is a side view of a quantitative transportation device including a quantitative weighing device.

[Explanation of symbols]

 1 Machine frame 2 Supply hopper 2'Lower end opening 3 Belt conveyor 4 Feeder 5 Material transfer port 6 Material cutting plate 7 Material upper surface leveling gate

Claims (1)

[Claims] 1. A feeder provided by a belt conveyor is provided at a lower end opening of a supply hopper provided in a machine frame, a material transfer port is opened on a material transfer side of the hopper, and the material is directed downward from the outside of the transfer port toward the inside. A quantitative transportation device comprising a material cutting plate which is inclined to a substrate, a material upper surface leveling gate which is provided on the material transfer side of the cutting plate, and which supports the gate and the cutting plate such that the sliding movement can be adjusted up and down.