JPH02159523A - Feeder for granule and weighing apparatus using the same - Google Patents

Abstract

PURPOSE:To enable altering of a fine supply continuously during the operating of a belt feeder by moving a belt feeder vertically to adjust an interval between a belt of the belt feeder and a lower end of a supply hopper for storing granule. CONSTITUTION:A belt feeder 12 is arranged below a supply hopper 10 to transport a granule A. The lower end 10a of the hopper 10 is formed into a cylinder and a mobile cylinder 14 having a notch part 13 is fitted movable vertically. The feeder 12 moves in directions of the arrows B and C with an interval adjuster 22 together with a feeder driver 21 to adjust an interval D between a belt 16 and the lower end 10a. When the feeder 12, hence, a cylinder 14 is located at the lowest position, the granule A is discharged onto the belt 16 until reaching a proper angle of repose. When the belt 16 is lifted up to a position of contacting the cylinder 14, the granule A is supplied only from the entire section of the notch part 13. With further lifting of the feeder 12, an area of an opening of the notch part 13 is reduced while a rotational speed of a driving roll 17 is lowered thereby creating a fine supply state.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to powders such as cereal flour, cereal grains, seasonings, detergents, drugs, dyes, sand, gravel, cement, ceramic powder, plastic powder, and plastic grains. The present invention relates to a device for automatically supplying a specified amount of powder or granules (hereinafter referred to as powder or granules), and an automatic measuring device using this device. More specifically, the present invention relates to an apparatus for feeding and measuring powder and granular materials in a batch system using a belt feeder.

[Prior art] Conventionally, this type of powder supply device using a belt feeder regulates the layer thickness of the powder on the belt and adjusts the supply amount of the powder according to this layer thickness. A powder weighing device is provided, in which a layer thickness damper is arranged on the belt, and a cut damper is arranged near the downstream end of the belt to block the powder from falling from the downstream end of the belt to the weighing hopper. It has been proposed (for example, Utility Model Application Publication No. 62-152228).

In the powder measuring device disclosed in Japanese Utility Model Publication No. 62-152228, a small amount damper with a notch is further arranged near the downstream end of the belt and above the cut damper, and this small amount damper increases the We try to measure powder and granular materials with precision.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional device, when changing the degree of fine supply of powder or granular material by the small quantity damper, it is necessary to change the position of the notch plate that constitutes the small quantity damper when the small quantity damper is not activated. It was necessary to shift the size of the notch or replace it with another notch plate with a different size of notch. Therefore, once the small quantity damper is set in the device and activated, the small amount of powder and granular material supplied before it is cut off will be constant.
There was a problem in that the fine feed amount could not be changed unless the belt feeder was stopped. As a result, there remains room for further improvement in order to supply powder and granules with higher accuracy to the target measurement value.

The object of the present invention is to supply powder and granular material that can continuously change the small feed amount during the operation of a belt feeder, and that can supply a precisely specified amount of powder and granular material in a batch manner in a short period of time. The goal is to provide equipment.

Another object of the present invention is to provide a measuring device for automatically weighing powder or granular material using the above-mentioned feeding device.

[Means for Solving the Problems] In order to achieve the above object, the powder and granular material supply device of the present invention includes a supply hopper for storing the powder and granular material, and a supply hopper arranged below the supply hopper and supplied from the supply hopper. a belt feeder that conveys the powder and granular material to a measuring container; an interval adjustment means that moves the belt feeder upward or downward to adjust the interval between the belt of the belt feeder and the lower end of the supply hopper; The apparatus includes a feeder driving means for driving a belt feeder, and a controller for controlling the interval adjusting means and the feeder driving means.

Further, in the powder/granular material measuring device of the present invention, the measuring container is mounted on an electronic scale, and the controller controls the feeder driving means and the interval adjusting means based on the weighed value of the electronic scale. It is.

[Operation] The co-controller controls the feeder drive means and the interval adjustment means, so that the lower end of the supply hopper continuously regulates the layer thickness of the powder on the belt, and the lower end of the supply hopper and the belt It is possible to perform continuous feeding from coarse feeding when the distance is wide to fine feeding when the distance is narrow.

[Example] Next, embodiments of the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 to 9, an arch breaker 11 is provided in the supply hopper 10 for storing the powder and granular material A to prevent crosslinking of the powder and granular material A.
A supply hopper 10 is provided below the supply hopper 10.
A belt feeder 12 is arranged to convey the powder and granular material A supplied from the belt feeder 12 to the measuring container 25. The belt feeder 12 is a small belt conveyor having a belt width and a belt length wider than the spread area of the granular material A discharged from the supply hopper 1°. The arch breaker 11 is rotationally driven by a motor lla, and the weighing container 25 is mounted on an electronic scale 26. The lower end 10a of the supply hopper 10 is formed into a cylindrical shape in this example, and a belt feeder 1 is attached to the lower end 10a.
A movable cylinder 14 having a notch 13 facing in the conveying direction of No. 2
are fitted so as to be movable upward or downward. A stopper 1 is provided at the lower end 10a to determine the lowest position of the movable cylinder 14.
5 (FIGS. 4 and 7).

The belt feeder 12 is composed of a belt 16, a drive roll 17, a driven roll 18, 19, and a stationary plate 20-, and the drive roll 17 is driven by a feeder drive device 21. The belt feeder 12 is moved along with the feeder driving device 21 by the interval adjusting device 22 diagonally upward in the direction opposite to the conveyance direction (direction B) or diagonally downward in the same direction as the conveyance direction (direction C), thereby moving the belt 16 and the supply hopper. 10 and the lower end 10a can be adjusted.

As shown in FIGS. 1 and 2, the movable cylinder 14 that fits into the lower end 10a of the supply hopper 10 has a belt 16 attached to the lower end 10a.
When it leaves 0a, the stopper 15 (Fig. 4 and Fig. 7)
It moves downward under its own weight until it stops at , and when the belt 16 of the belt feeder 12 rises, it is configured so that it can come into contact with the belt 16 and move upward, as shown in FIGS. 8 and 9. . In order to guide the vertical movement of the movable cylinder 14, a protrusion 10b is provided on the outer periphery of the lower end portion 10a.

As shown in FIG. 1, the electronic scale 26 includes a load cell 2.
7 and an AD converter 28 are built in, and the output of the AD converter 28 is connected to the control input of the controller 23. The controller 23 includes a setting device 29 for setting a target amount to be poured into the container 25.

The control output of the controller 23 is the motor 11a1 of the arch breaker 11, the feeder drive device 21, and the interval adjustment device 2.
2, respectively.

Next, the operation of the device having such a configuration will be explained based on the characteristic diagram shown in FIG.

First, the target value G to be measured is set using the setting device 29 of the controller 23. Next, the controller 23 activates the arch breaker 11 to prevent crosslinking of the powder and granular material in the supply hopper 10, while adjusting the interval adjustment device 22 based on the target amount G.
is controlled, and the belt feeder 12 is moved diagonally downward in the same direction as the conveyance direction (direction C in FIG. 1). Movable tube 14
is lowered by its own weight from the lower end 10a of the supply hopper lO and stopped at the stopper 15. When the distance between the belt 16 and the movable tube 14 is set based on the target amount G, the powder A is discharged onto the belt 16 until it reaches a specific angle of repose.

Next, the feeder drive device 21 is operated, and the rotational speed of the drive roll 17 of the belt feeder 12 is adjusted based on the target amount G.
In other words, the conveyance speed of the powder or granular material is set. As a result, the granular material A having a trapezoidal cross-section, which has widthwise spread and spacing depending on the angle of repose of the granular material A, is quantitatively supplied to the weighing container 25 in accordance with the conveyance speed of the belt feeder 12.

Switching value S when the weighing value of the electronic scale 26 is 80% of the target value G
, the controller 23 controls the interval adjustment device 22 to move the belt feeder 12 obliquely upward in the direction opposite to the conveyance direction (direction B in FIG. 1), and as shown in FIG. is raised to a position where it contacts the movable cylinder 14. As a result, only the entire cross section of the notch 13 of the movable cylinder 14 is opened, and the powder material A is supplied onto the belt 16 only from this notch 13. After this small amount feeding state, when the weighing value of the electronic scale 26 reaches the switching value S2, which is 95% of the target value G, the controller 23 further pulls up the belt feeder 12 using the interval adjustment device 22, and As shown, the opening area of the notch 13 is reduced, and at the same time, the feeder drive device 21 is controlled to reduce the rotational speed of the drive roll 17 to bring about a small amount supply state. When the weighing value of the electronic scale 26 reaches 99% of the target value G, the belt feeder 1
2 passes through the state shown in FIG. 7, and as shown in FIGS.
The lower end portion 10a of 0 is pressed against the lower end portion 10a of 0. In this state, all the discharge ports of the supply hopper 10 are closed, and the supply of the granular material A is cut off.

As the belt feeder 12 approaches the target layer G, the distance of the belt 16 to the supply port of the hopper 10 becomes shorter, and the powder A can be quickly dropped into the container 25, thereby shortening the measuring time.

Note that the control characteristics of the controller shown in FIG. 10 are merely an example, and the present invention is not limited thereto.

Furthermore, although the lower end of the supply hopper and the movable tube are cylindrical in shape, they are not limited to cylindrical shapes and may be rectangular tubes.

[Effects of the Invention] As described above, according to the present invention, the belt feeder is arranged below the powder supply hopper, and the distance between the belt of the belt feeder and the lower end of the supply hopper is adjusted. This makes it possible to easily switch continuously from supplying a large amount of powder or granular material to supplying a small amount of powder or granular material, and it is possible to accurately supply a set weight of powder or granular material in a short time without increasing the size of the device. .

Further, by adjusting the conveyance speed of the belt feeder and the distance between the belt and the lower end of the supply hopper based on the weighing value of the electronic scale that weighs the weighing container, automatic weighing can be performed with high precision.

Particularly, by fitting a vertically movable movable cylinder having a notch to the lower end of the supply hopper, it is possible to supply and measure powder and granular material with even higher accuracy.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a measuring device using a powder supply device according to an embodiment of the present invention. Figure 2 is a view in the direction of the ■ arrow in Figure 1. FIG. 3 is a plan view of FIG. 1. FIG. 4 is an enlarged sectional view of the main part of the lower end of the supply hopper showing the small amount supply state. FIG. 5 is a side view of the lower end of the supply hopper and the belt feeder showing the small amount supply state. FIG. 6 is a front view of FIG. 5. FIG. 7 is an enlarged cross-sectional view of the main part of the lower end of the supply hopper showing the extremely small amount supply state. FIG. 8 is a side view of the lower end of the supply hopper and the belt feeder showing the supply cutoff state. FIG. 9 is a front view of FIG. 8. FIG. 10 is a control characteristic diagram of the controller. A: Powder, O: Supply hopper, Oa: Lower end of supply hopper, 2: Belt feeder, 3: Notch, 4: Movable cylinder, 5: Stopper, 6: Belt, 1: Feeder drive device (feeder (driving means), 2: interval adjustment device (interval adjustment means), 3: controller, 5: measuring container, 6: electronic scale. Figure Figure Figure Figure Figure

Claims (1)

[Scope of Claims] 1) A supply hopper for storing powder and granules; a belt feeder arranged below the supply hopper and conveying the powder and granules supplied from the supply hopper to a measuring container; and a belt feeder arranged above the belt feeder. or an interval adjustment means that moves downward to adjust the interval between the belt of the belt feeder and the lower end of the supply hopper, a feeder drive means that drives the belt feeder, and the interval adjustment means and the feeder drive means. A powder supply device equipped with a controller. 2) A movable cylinder having a notch facing the conveyance direction of the belt feeder is fitted into the lower end of the cylindrical supply hopper, and a stopper is provided on the supply hopper to determine the lowest position of the movable cylinder. The movable cylinder is configured such that when the belt leaves the lower end, it moves downward under its own weight until it stops at the stopper, and when the belt of the belt feeder rises, it comes into contact with the belt and moves upward. 2. The powder supply device according to claim 1, which is configured as follows. 3) The granular material feeding apparatus according to claim 1, wherein the interval adjusting means is configured to move the belt feeder obliquely upward in the direction opposite to the conveyance direction thereof or diagonally downward in the same direction as the conveyance direction. 4) The measuring container according to claim 1 is mounted on an electronic scale,
2. A powder and granule weighing device according to claim 1, wherein the controller controls the feeder drive means and interval adjustment means according to claim 1 based on the weighed value of said electronic scale. 5) The powder and granular material weighing device according to claim 4, wherein the controller controls the feeder drive means to reduce the conveyance speed of the belt feeder as the weighing value of the electronic scale approaches the target value.