JPH05332804A - Powder particle constant supplier - Google Patents

Abstract

PURPOSE:To supply powder particles such as medicine and food at a set constant supply rate per a unit of time. CONSTITUTION:A measuring storage part 2 having an open control valve 1 at the upper part and an opening 3 at the lower end is provided and the stop amount of the supplying material of powder particle stored tentatively in the measuring storage part 2 is maintained within a set range with a control device 4 for controlling the opening of the open control valve 1 and thus powder particle such as medicine and foods are supplied constantly. And at the lower end of the measuring storage part 2, a second open control valve is provided to form an opening and with controlling the opening of this second opening control valve, the supply rate per a unit time is made freely variable. Thus, by eliminating contact flakes to be fine flakes or fine powder, the mixing of foreign material in the measuring object (powder particles is prevented. The supply rate is always exactly maintained by the control of the control device such as a microcomputer controller. As no mechanical seal part requiring maintenance parts exist, the maintenance work becomes easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sends powdery and granular materials such as plastics, earth and sand, chemicals, foods, etc. to a mixer hopper, conveyor, etc. at a constant set supply amount per unit time for the purpose of mixing and weighing. The present invention relates to a powder and granular material quantitative supply device for.

[0002]

2. Description of the Related Art As shown in FIG. 5, an inlet 11 and an outlet 12
A rotary impeller 13 is internally provided in a weighing case 10 having, and a powder and granular material quantitative supply device, so-called rotary, in which the supply amount per unit time can be appropriately selected by controlling the rotation speed of the rotary impeller 13. Valves are known.

[0003]

In the above-mentioned known powdery-particulate material constant-quantity supplying device, if there is a gap between the tip 13a of the rotary impeller and the case inner wall 14, the constant-quantity supply of powdery granular material cannot be ensured. It is necessary to attach the abutment piece 15 to the tip 13a of the rotary impeller. The contact piece 15 is made of a light alloy, a hard synthetic resin, a hard rubber, or the like, but when contacted with the inner wall 14 of the case, the contact piece 15 becomes a fine piece or a fine powder to be a foreign substance on a weighing object (powder granule). There is a problem that is mixed in. Further, there are drawbacks such as wear of the seal portion and complicated structure because it is constantly rotating.

[0004]

According to the present invention, there is provided a metering reservoir having an opening at a lower end thereof, an opening control valve provided above the metering reservoir, and a storage amount of a powdery granular material temporarily stored in the metering reservoir. A control device for controlling the opening degree of the opening control valve is provided, and the opening degree of the opening control valve is controlled by the control of the control device to maintain the storage amount of the metering reservoir within the setting range. By doing so, a fixed amount is supplied while maintaining the supply amount per unit time at the set value. The second invention of the main leg of the present invention provides a second opening control valve at the lower end of the metering reservoir to form an opening, thereby providing a second opening.
The supply amount per unit time is fixedly supplied at an arbitrary set value by controlling the opening degree of the opening control valve.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic principle of the present invention will be described with reference to FIG. In the hourglass 8, the flow rate Q of the sand falling on the neck 9
Is proportional to the cross-sectional area R of the neck 9, and is proportional to the square root of the height h from the neck 9 to the top surface of the sand. Therefore, the weighing reservoir 2
According to the opening area of the second opening control valve 3 at the lower end of the metering storage section 2, by setting the position of the top surface m of the powdery granular material M temporarily stored in the inside to a constant range or within an allowable range with respect to a set value.
The flow rate (supply amount per unit time) of the powdery and granular supply material M flowing out from the metering storage section 2 can be set to a constant value or an allowable range with respect to a set value.

The first invention of the present application will be described in detail based on the embodiment shown in FIG. A supply hopper 6 is arranged below the charging conveyor 5, an opening control valve 1 is connected to the lower end of the supply hopper 6, and a measuring reservoir 2 is arranged below the opening control valve 1. An opening 3 is provided at the lower end of the measuring and storing section 2, and a discharge conveyor 7 is arranged below the opening 3. In the example,
Although the measuring reservoir 2 is a hopper-shaped cylindrical body having a reduced lower portion, it may have a simple shape such as a prismatic shape or any other suitable shape. The level sensor 4A for detecting the position of the top surface m of the powdery and granular supply M temporarily stored in the metering and storing section 2 and the detection signal Sa from the level sensor 4A are input to the opening control valve 2. A control device 4 including a microcomputer 4B that outputs an opening control signal Sb that controls the opening degree, and controls the opening degree of the opening control valve 1 to maintain the storage amount of the metering reservoir 2 within a set range. .. In the operation of the powdery and granular material quantitative supply device of the present invention, the powdery or granular material M is supplied from the input conveyor 5 continuously or intermittently according to the operation control of the input conveyor 5, and the supply hopper 6 is used.
Be thrown into. The powdered and granular feed M fed into the feed hopper 6 is controlled by the opening control valve 1 to control the opening of the metering reservoir 2.
Is temporarily stored in the metering storage unit 2 and then discharged from the opening 3 toward the discharge conveyor 7. The supply amount of the granular supply M from the opening 3 is determined by the opening area of the opening 3 and the position of the top surface of the granular supply M in the measuring reservoir 2 according to the principle of the hourglass in FIG.

The control device 4 controls the opening area of the opening control valve 1 by the microcomputer control by the microcomputer 4B based on the input of the detection signal Sa of the level sensor 4A to control the opening of the metering reservoir 2.
By controlling the amount of fall of the powdery feed M to the
The position of the top surface m of the powdery and granular feed M temporarily stored in the metering and storing section 2, that is, the height of the powdery and granular supply top surface m in the metering and storing section 2 with respect to the opening 3 is set to a constant value or Allowable range for set value. Thus, the amount of the powdery or granular material M supplied to the discharge conveyor 7 is constantly supplied in a fixed amount under the restriction of the opening area of the opening 3. Figure 3
Shows an embodiment in which the opening area of the opening 3 is changeable,
The flange 3a of the opening flange C is detachably attached to the lower flange 2a of the measuring storage part (pipe) 2 (see FIG. A), and a plurality of opening flanges C having different opening areas S are provided as shown in FIG. That is, the supply amount can be freely changed by replacing with the opening flange C having a different opening area S. Further, in the embodiment, the level sensor 4A is provided at one location, but the level sensor 4A is provided with a plurality of level positions for detecting the plurality of level sensors 4A, and h of FIG. It can also be changed in multiple stages by selecting.

FIG. 4 shows an embodiment of the second invention of the present application, and FIG.
The second opening control valve 30 is provided in place of the opening 3 at the lower end of the metering reservoir 2 in the embodiment of the first invention of the present application. In addition, in the embodiment, the weighing and storing unit 2 has a hopper shape, but it may have a simple shape such as a cylindrical shape or a prismatic shape, or any other suitable shape. The granular material M supplied to the supply hopper 6 is supplied to the metering reservoir 2 under the control of the opening of the opening control valve 1 and temporarily stored in the metering reservoir 2, and then the second opening control valve 30. Under the control of the opening of, the sheet is discharged toward the discharge conveyor 7. According to the principle of the hourglass of FIG. 2, the supply amount of the powdery and granular feed M from the second opening control valve 30 is the opening area of the second opening control valve 30 and the top of the powdery and granular feed M in the metering reservoir 2. And the surface position. Thus, the amount of the powdery or granular material M supplied to the discharge conveyor 7 is constantly supplied in a fixed amount under the control of the opening of the second opening control valve 30. The opening area of the second opening control valve 30 can be automatically controlled by controlling it with the microcomputer 4B or a microcomputer provided independently of the microcomputer 4B, but it goes without saying that it may be manually controlled. Further, the opening control valve 1 and the second opening control valve 30 are disclosed in Japanese Patent Application No. 61-236568 (Japanese Patent Application Laid-Open No. 63-236568) filed by the applicant of the present application.
In the case of the flexible cylinder type opening control valve shown in "Shutoff valve in hopper for powder and granular material" of 96092), the flexible cylinder does not bend when the valve is rotated, and the opening area is always accurately controlled. At the same time, the valve has a downward conical shape, and it is convenient that the feed material M in the form of granules can flow out without causing retention.

In the embodiment shown in FIG. 5, the metering and storing section 2 is a cylindrical pipe, and the upper end of the measuring and storing section 2 is Japanese Patent Application No. 2-3881.
The above-mentioned Japanese Patent Application No. 61-236568 through the carrier pipe connecting device B of No. 4 "Conveyor pipe connecting device in powder and granular material conveying path".
No. 63 (Japanese Patent Laid-Open No. 63-96092), "Flexible cylinder type shutoff valve A" is connected to form an opening control valve 1, and a flexible cylinder type shutoff valve A is also provided at the lower end. It is connected to form the second opening control valve 30. In the flexible tubular cutoff valve A, the flexible tubular valve body 10 is inserted into the outer cylinder 11 and the inner cylinder 12, and the upper and lower ends of the flexible tubular valve body 10 are respectively connected to the upper end and the outer side of the inner cylinder 12. The ring-shaped groove 15 formed in the inner cylinder 12 is fixed to the lower end of the inner cylinder 12, and the guide hole 13 formed in the inner cylinder 12 is engaged with the protrusion 14 protruding from the upper portion of the outer cylinder 11 toward the inner core side. The rotary body 16 is loosely engaged with the rotary body 16, and the lower end of the drive shaft 17 hanging from the rotary body 16 is inserted into the vertical guide hole (not shown) of the drive block 18 fixed to the upper portion of the outer wall of the outer cylinder 11 to rotate the rotary shaft 16. The drive block 18 is moved up and down in accordance with the rotation of the moving body 16, and as the drive block 18 moves up and down, it is guided by the engagement between the guide hole 13 and the projection 15, and the outer cylinder 11
To raise or lower. As the outer cylinder 11 is raised or lowered, the flexible tubular valve body 10 is deformed and the valve opening area is changed, as shown in FIG. Also, the rotating body 1
6, the rotation of the motor 20 is transmitted through the belt transmission mechanism 19, and the valve opening area can be arbitrarily controlled by controlling the rotation amount of the motor 20.

The transport pipe connecting device B is constructed by mounting a rigid tubular body 21 inside the tubular body 20 so as to be vertically movable, and pressing the lower end of the rigid tubular body 21 against the inner wall of the tubular body 20. 21
The upper end of the cylinder is vertically movable and eccentric to the cylinder body 20. In addition, the flexible tubular cutoff valve A and the transfer pipe connecting device B
The flanges 23 at the lower end of the hopper 6 and the upper flange 23 of the flexible tubular cutoff valve A functioning as the opening control valve 1 are connected by a plurality of connecting screw shafts 22 arranged outside the transfer pipe connecting device B. Of the measuring reservoir (cylindrical pipe) 2 and the lower flange 27 of the measuring reservoir (cylindrical pipe) 2 and the flexible tubular cutoff valve functioning as the second opening control valve 3. A flange 26
By connecting the hopper 6, the opening control valve 1 (flexible cylinder type shutoff valve A, the transfer pipe connecting device B), the metering reservoir 2 (cylindrical pipe), the second opening control valve 3 (flexible cylinder type shutoff). The valve A) is integrated by the connecting screw shaft 22 and is supported in a suspended state. In FIG. 4, 29 is a seal packing. In the quantitative supply of the granular powder according to the present invention, the granular product is a granular product such as a plastic molded product, a metal processed product, for example, bolts, nuts, pachinko balls, by quantitatively supplying the granular product, a unit time The number of supplies per hit can be controlled to an arbitrary number, and it can be used as a counting mechanism or a weighing mechanism for bagging a predetermined number of predetermined scenes.

[0011]

EFFECTS OF THE INVENTION The present invention eliminates contact pieces which may become fine particles or fine powder due to abrasion due to contact with the inner wall of the case when a fixed amount of powdery or granular material is supplied. It is possible to prevent foreign matter from entering the (powder granules), and it is possible to always maintain an accurate supply amount under the control of a control device such as a microcomputer control. Further, as the maintenance parts, only the opening control valve is used, and there is no constantly rotating part or mechanical seal part, so that maintenance work is easy. In particular, when the opening control valve is a flexible cylinder type opening control valve, the maintenance work is extremely simple because only the replacement of the flexible valve body is required.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the outline of an embodiment of a powder and granular material quantitative supply device of the first invention of the present application.

FIG. 2 is an explanatory diagram showing the principle of the present invention.

FIG. 3 is a vertical cross-sectional view showing the outline of a second embodiment of the powdery granular material quantitative supply device of the first invention of the present application.

FIG. 4 is a vertical cross-sectional view showing the outline of an embodiment of a powder and granular material quantitative supply device of the second invention of the present application.

FIG. 5 is a longitudinal sectional view showing a second embodiment in which the second invention of the present application is implemented by using a flexible tubular opening control valve.

FIG. 6 is an explanatory diagram of opening area control in a flexible tubular opening control valve.

FIG. 7 is a vertical sectional view showing a known powder / granular material quantitative supply device (rotary pulp).

[Explanation of symbols]

 1 Opening Control Valve 2 Metering Reservoir 3 Opening 4 Control Device 30 Second Opening Control Valve

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[Procedure amendment]

[Submission date] May 24, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

Claims (3)

[Claims] 1. A metering / storing section having an opening at a lower end, an opening control valve provided above the metering / storing section, and a powder temporarily stored in the metering / storing section by controlling an opening degree of the opening / control valve. Includes a control device that keeps the storage amount of the granular supply within the set range, and supplies the granular material quantitatively at the supply amount per unit time set by the opening area at the lower end of the measurement storage part and the storage amount of the measurement storage part. An apparatus for quantitatively supplying powdery particles, which is characterized in that 2. The control device controls the opening degree of the opening control valve to maintain the upper limit level of the powdery and granular feed material stored in the metering / storing portion within a set range, thereby temporarily storing the powdery or granular material in the metering / storing portion. The powdery granular material quantitative supply device according to claim 1, wherein the amount of stored supply is controlled within a set range. 3. A metering reservoir, an opening control valve provided above the metering reservoir, a second opening control valve provided at the lower end of the metering reservoir, and a granular supply material temporarily stored in the metering reservoir. And a control device for controlling the opening degree of the opening control valve, so that the amount of powdery granular material to be temporarily stored in the metering storage section and the opening degree of the second opening control valve are included. An apparatus for quantitatively supplying powder and granules, which quantitatively supplies powder and granules at a set supply amount per unit time. Claims 4 The powdery granular material quantitative supply device according to claim 3, wherein the opening control valve and the second opening control valve are flexible cylindrical opening control valves.