JPH0725477A - Feeder for super-fine amount pulverulent body fixed flow - Google Patents

Abstract

PURPOSE:To deliver stably a fixed-fine flow of pulverulent bodies by providing a vibrating device for vibrating a stick, a balance for measuring the weight of the pulverulent body amount and a control section for running a fluid adjusting means so that the variation of reduction of the weight in the balance approaches a desired value. CONSTITUTION:A stick 4 is adapted to make contact with pulverulent bodied 8 put in a receptacle 7 so that the pulverulent bodied 8 are attached to the stick 4 and shifted to a ejecting position together with the stick. When a vibrating device 12 vibrates the stick 4 shifted to the ejecting position having the pulverulent bodies attached thereto, the pulverulent bodies 8 attached to the stick 4 falls to be ejected. Errors in the ejected flow is detected by a control section 21 according to the variation of reduction of a value measured by a balance 13. A fluid adjusting means 18 is run to change the surface area of the stick 4 and adjust an amount of the pulverulent bodies attached to the stick 4. This cycle is repeated to deliver the pulverulent bodies.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supplying a very small amount of powder or granular material at a constant flow rate at a constant flow rate.

[0002]

2. Description of the Related Art Conventionally, as a powder and granular material feeder, a screw feeder for rotating a screw 2 inside a casing 1 to cut out a raw material 3 as shown in FIG.
In addition to this, belt type or vibration type feeding devices are also used.

[0003]

With such a conventional feeding device, the minimum payout amount of about 100 grams per hour is the limit, and in the related industries such as dyes, foods, chemicals and pharmaceuticals, it is required to spend 1 hour. The current situation is that it is not possible to meet the demand for a very small amount of dispensing per 100 grams per unit.

An object of the present invention is to provide a constant flow rate supply device for ultra-fine particles, which can stably discharge a smaller amount than ever before at a constant flow rate.

[0005]

According to a first aspect of the present invention, there is provided a device for supplying a constant amount of a very small amount of powder or granules, which has flexibility such that its surface area can be changed according to the amount of fluid to be injected. A stick movably mounted between a position in contact with the particles and a discharge position other than the container, a fluid adjusting means for adjusting the amount of fluid injected into the stick, and a stick in the discharge position. A vibrating device for giving vibration, a scale for measuring the weight of the amount of powder and granules in stock, and a control unit for operating the fluid adjusting means so that the weight reduction change amount of the scale approaches a target value. Is characterized by.

[0006] According to a second aspect of the present invention, there is provided a device for supplying a constant amount of a very small amount of powder or granules, which has flexibility such that the surface area can be changed according to the amount of fluid to be injected, and the position where the powder or granules placed in the container comes into contact with the device. A stick that is movably mounted between the container and a discharge position separate from the container, a fluid adjusting unit that adjusts the amount of fluid injected into the stick, and a position that comes into contact with the granular material contained in the container. A charging device for charging the stick, a vibrating device for vibrating the stick at the discharging position, and a scale for measuring the weight of the amount of powder and granules in stock,
It is characterized in that a control unit for operating the fluid adjusting means is provided so that the weight reduction change amount of the balance approaches a target value.

[0007] The ultra-fine powder and granular material constant flow rate supply device according to claim 3 has flexibility such that the surface area can be changed according to the amount of fluid to be injected, and a position where the powder and granular material in a container comes into contact with the device. A stick that is movably mounted between the container and a discharge position separate from the container, a fluid adjusting unit that adjusts the amount of fluid injected into the stick, and a position that comes into contact with the granular material contained in the container. , A charging device for charging the stick, a static eliminator for discharging static electricity of the stick at the discharge position, a scale for measuring the weight of the amount of powder and granules in stock, and a weight reduction change amount of the scale to a target value. It is characterized in that a control unit for operating the fluid adjusting means is provided so as to approach.

The ultra-small amount of granular material constant flow rate supply device according to claim 4 has flexibility such that the surface area can be changed according to the amount of fluid to be injected, and the position where it contacts the granular material contained in the container. A stick that is movably mounted between the container and a discharge position separate from the container, a fluid adjusting unit that adjusts the amount of fluid injected into the stick, and a position that comes into contact with the granular material contained in the container. Charging device for charging the stick, a vibrating device for vibrating the stick at the discharging position, a static eliminator for discharging static electricity from the stick at the discharging position, and measuring the weight of the amount of stocked particles. And a control unit for operating the fluid adjusting means so that the weight reduction change amount of the balance approaches a target value.

[0009]

According to the structure of claim 1, the stick is brought into contact with the granular material contained in the container, the granular material is attached to the stick, and the stick with the granular material is moved to the discharge position. . When the vibrating device vibrates the stick that has moved to the discharge position, the powder particles attached to the stick fall and are discharged. The control unit detects the error of the dispensed flow rate from the decrease change of the weight value of the balance, and operates the fluid adjusting means to change the surface area of the stick to adjust the amount of sticking to the stick.

According to the second aspect of the present invention, the stick charged by the charging device is brought into contact with the powder or granular material contained in the container to electrostatically adhere the powder or granular material to the stick to attach the powder or granular material. Move the stick to the eject position. When the vibrating device vibrates the stick that has moved to the discharge position, the powder particles attached to the stick fall and are discharged. The control unit detects the error of the dispensed flow rate from the decrease change of the weight value of the balance, and operates the fluid adjusting means to change the surface area of the stick to adjust the amount of sticking to the stick.

According to the third aspect of the present invention, the stick charged by the charging device is brought into contact with the powder or granular material contained in the container to electrostatically adhere the powder or granular material to the stick to adhere the powder or granular material. Move the stick to the eject position. When the static electricity of the stick that has moved to the discharge position is removed by the static eliminator, the powder particles that have been electrostatically attached to the stick fall and are discharged. The control unit detects the error of the dispensed flow rate from the decrease change of the weight value of the balance, and operates the fluid adjusting means to change the surface area of the stick to adjust the amount of sticking to the stick.

According to the structure of claim 4, the stick charged by the charging device is brought into contact with the granular material contained in the container, and the granular material is electrostatically adhered to the stick to adhere the granular material. Move the stick to the eject position. When the static eliminator removes static electricity from the stick that has moved to the discharge position and the vibrating device vibrates the stick, the powder particles attached to the stick fall and are discharged. The control unit detects the error of the dispensed flow rate from the decrease change of the weight value of the balance, and operates the fluid adjusting means to change the surface area of the stick to adjust the amount of sticking to the stick.

[0013]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 3 shows the operating principle of the ultra-fine powder and granular material constant flow rate supply device of the present invention. In the explanation of this operation principle, the tip shape of the stick 4 is formed into a spherical shape. The stick 4 is attached to the tip of a rod 6 of a moving device via a lifting drive mechanism 5. The container 7 contains the granular material 8 to be discharged.

The moving cycle of the stick 4 is constructed as follows. As shown in (a) of FIG. 3, the moving device moves the stick 4 to a position above the container 7, and the elevating and lowering drive mechanism 5 lowers the stick 4, so that the tip of the stick 4 is stored in the container 7. Contact the granules 8. By the contact between the stick 4 and the granular material 8, the granular material 8 adheres to the surface of the tip of the stick 4. Next, the raising / lowering drive mechanism 5 raises the stick 4 as shown in FIG. 3 (b), and the moving device further moves the stick 4 to the receiving container 9 placed in the discharge position as shown in FIG. 3 (c). To the upper position. Then, the lifting drive mechanism 5 lowers the stick 4. In this state, the moving device sticks 4
Vibrate.

By vibrating, the granular material 8 adhered to the surface of the tip of the stick 4 separates from the tip of the stick 4 and falls into the receiving container 9. By repeating the process from the completion of (a) to (c) of FIG. 3 as one cycle, the granular material 8 can be discharged to the receiving container 9 at an extremely low flow rate as follows.

When the radius of the sphere at the tip of the stick 4 is r, the layer thickness of the powder or granules attached to the surface of the sphere is t, and the powder or granules adhere to the lower half of the sphere having the smallest surface area, they adhere to the stick 4. The volume V of the powdered or granular material is: V = t · 4π · r ² · 1/2 t = 100 μm, r = 10 mm, V = 100/1000 [mm] · 4π · 10 [mm] · 1/2 = 62.8 mm ³ = 0.0628 cc Here, if the bulk specific gravity is 0.5 [g / cc] and the adhered powder and granules fall completely, W _D = 0.0628 [cc] · 0.5 [g / cc] = 0.0314 [g] If one cycle is set to 5 seconds, then 720
It is cycled, and with a W _D · 720 = 0.0314 [g] · 720 = 22.61 [g / hour], it is possible to realize an extremely small amount of 22.61 grams / hour.

As is clear from this specific example, among the time required for one cycle, the shape of the tip of the stick 4, the amount of contact between the stick 4 and the granular material 8, etc., in order to obtain the desired payout amount. It can be realized by changing at least one of them.

FIG. 4 shows a specific example in which the stick 4 is vibrated at the discharge position. Here, the funnel-shaped discharge pipe 10 is arranged above the receiving container 9 and is fixed to the discharge pipe 10 and the fixed side.
An oscillating device 12 is interposed between the oscillating device 11 and the device 11. The vibrating device 12 for applying ultrasonic vibration or electric vibration to the discharge pipe 10 is configured to give vibration to the discharge pipe 10 only in continuous operation or when the stick 4 approaches or contacts the discharge pipe 10.

FIG. 1 shows an apparatus of the present invention in which the above-mentioned operating principle is adopted in a constant flow rate supply apparatus. In the embodiment shown in FIG. 1, a container 7, a plurality of sticks 4 and the like are mounted on a platform scale 13.

A rod 6 is attached in a circumferential direction to a rotating body 16 rotatably attached to a pole 15 provided upright on a platform 14 of the platform scale 13, and a lifting drive mechanism is provided at the tip of each rod 6. Sticks 4 are attached via 5 respectively. Further, the pole 15 is connected to the discharge tube through the vibration device 12.
10 is installed. The rotating body 16 is rotationally driven by the motor 17, and is rotated between the position where each stick 4 comes into contact with the granular material 8 accumulated in the container 7 and the position where the stick is discharged, and each lifting drive is performed in synchronization with this rotation. The mechanism 5 is operated and the stick 4 is moved up and down.

At least the tip portion A of each stick 4 is
It has flexibility that can change its surface area according to the amount of injected fluid, and air C is injected from the base end B to the inside of the tip A of the stick 4. In the supply path D of the air C to each stick 4, a switching valve as a fluid adjusting means 18 is provided.
19 and pump 20 are provided. The switching of the switching valve 19 is controlled by the control unit 21. The control unit 21 compares the target flow rate setting value with the weight reduction value per unit time of the weight value of the platform scale 13, and if the error is within the allowable range, the air C injected into the stick 4 is detected. When the weight reduction value is lower than the target flow rate setting value by closing the supply path D so as not to leak to the outside, the switching valve 19 is moved to the pump 20 side for a specified time as shown in FIG. 2 (a). The surface area of the tip A of the stick 4 is expanded by switching and injecting a predetermined amount of air C into the stick 4. When the weight reduction value exceeds the target flow rate setting value, the switching valve 19 is switched to the opening E side for a specified time as shown in FIG. The surface area of the tip portion A of the stick 4 is reduced by discharging it to the atmosphere in a fixed amount.

The motor 17 is not continuously operated at a constant speed, but is temporarily stopped or switched to a low speed at a position where it comes into contact with the granular material 8 and a position where it is discharged. In the embodiment shown in FIG. 3, the stick 4 is brought into contact with the granular material 8 to adhere the granular material 8 to the stick 4,
At the discharge position, the vibrating device 12 vibrates the stick 4 to drop the powder or granules 8 attached to the stick 4, but if the powder or granules 8 to be handled have a low adhesive property, the stick 4 is charged. A charging device is provided to allow the charged stick 4 to come into contact with the powder or granules 8, or a static eliminator for removing static electricity from the charged stick 4 is provided to prevent stick 4 from vibrating. Either when the sticking particles are dropped by discharging the stick 4 with the static eliminator or when the sticking particles are dropped by applying the vibration to the stick 4 and discharging the stick 4 with the static eliminator A configuration can also be adopted.

As described above, the control unit 21 compares the target flow rate setting value with the weight reduction value per unit time of the weight value of the platform scale 13.
Can adjust the surface area of the tip A of each stick 4 to adjust the amount of adhesion when it comes into contact with the powder or granules 8 to an appropriate amount. Can be realized.

In the above embodiment, the air C was injected as the fluid into the stick 4. However, instead of the air C, an appropriate viscosity liquid is injected into the stick 4, or the liquid and the air C are injected.
Alternatively, the surface area of the tip portion of the stick 4 may be adjusted by using and. Gas other than air C can be used as the gas.

In the above embodiment, the motor 17 and the elevating / lowering drive mechanism 5 were operated to move the stick 4 between the position in contact with the granular material 8 and the discharging position. An industrial robot programmed to achieve the desired operation can be used for this, and the position where the robot hand grips the stick 4 and contacts the granular material 8 contained in the container 7 The robot is driven so that it can move between the discharge position and the discharge position. At the ejection position, the stick 4 can be vibrated by driving the robot.

[0026]

According to the apparatus for supplying a constant amount of fine particles or granules according to claim 1, it has flexibility to change the surface area according to the amount of fluid to be injected, and contacts the particles or granules contained in the container. Stick and a discharge position other than the container, the stick is movably mounted, fluid adjusting means for adjusting the amount of fluid injected into the stick, and a stick for vibrating the stick at the discharge position. Since a shaking device, a scale for measuring the weight of the amount of powder and granules in stock, and a control unit for operating the fluid adjusting means so that the weight loss change amount of the scale approaches the target value, The body can be attached and the stick that has moved to the discharge position can be vibrated to eject the adhering powder and granules.The error in the dispensed flow rate can be detected by the control unit from the change in the weighing value of the scale. , Drive the fluid control means Adjusting the deposition amount of the stick by changing the surface area of the click can be realized also stable constant flow payout at low flow rates than conventional.

According to the apparatus for supplying a very small amount of powder or granules as set forth in claim 2, it has flexibility such that the surface area can be changed according to the amount of fluid to be injected, and contacts the powder or granules contained in the container. A movably mounted stick between the container and a discharge position other than the container, a fluid adjusting means for adjusting the amount of fluid injected into the stick, and a powder or granular material contained in the container. The charging device for charging the stick at the position to be charged, the vibration device for vibrating the stick at the discharging position, the scale for measuring the weight of the amount of powder and granules in stock, and the weight reduction change amount of the scale are targets. Since the control unit for operating the fluid adjusting means is provided so as to approach the value, electrostatically adhering the powdery particles to the stick, and vibrating the stick that has moved to the discharge position to wipe off the adhered powdery particles. Can be issued and paid The flow rate error is detected by the control unit based on the decrease in the weighing value of the scale, and the fluid adjustment means is operated to change the surface area of the stick to adjust the amount of sticking to the stick, and the powder particles with small stickiness Even for the body, it is possible to realize a constant flow rate payout with a lower flow rate than ever before.

According to the apparatus for supplying a constant amount of ultra-fine powder or granules as set forth in claim 3, it has flexibility to change the surface area according to the amount of fluid to be injected, and contacts the powder or granules contained in the container. A movably mounted stick between the container and a discharge position other than the container, a fluid adjusting means for adjusting the amount of fluid injected into the stick, and a powder or granular material contained in the container. The charging device that charges the stick at the position where it is charged, the static eliminator that discharges the charge of the stick at the discharging position, the scale that measures the weight of the amount of powder and granules in stock, and the weight reduction change amount of the scale Since the control unit for operating the fluid adjusting means is provided so as to approach the value, electrostatically adhere the powder particles to the stick and remove the static electricity of the stick that has moved to the discharge position by the static eliminator to wipe the powder particles. Can be put out, The error in the discharge flow rate is detected by the control unit based on the decrease in the weighing value of the scale, and the fluid adjustment means is operated to change the surface area of the stick to adjust the amount of sticking to the stick, and Even with granules, it is possible to realize a constant flow rate payout with a lower flow rate than before.

According to the apparatus for supplying a very small amount of powder or granules as set forth in claim 4, it has flexibility to change the surface area according to the amount of fluid to be injected, and contacts the powder or granules contained in the container. A movably mounted stick between the container and a discharge position other than the container, a fluid adjusting means for adjusting the amount of fluid injected into the stick, and a powder or granular material contained in the container. Charging device for charging the stick at a position to be charged, a vibrating device for vibrating the stick at a discharging position, a static eliminator for discharging static electricity from the stick at a discharging position, and a weight of the amount of stocked granular material. And a control unit for operating the fluid adjusting unit so that the weight reduction change amount of the scale approaches a target value, electrostatic sticking powder particles to the stick, and moving the stick to the discharge position. Electrostatic The static electricity can be removed by the static eliminator, and the vibrating device can vibrate the stick to dispense the powder or granules.The error in the dispensed flow rate is detected by the control unit from the decrease in the weighing value of the scale, 4. The adjusting means is operated to change the surface area of the stick to adjust the amount of sticking to the stick, and even if the powder or granular material has a small sticking property, the flow rate is lower than that of the conventional one, and more than the device according to claim 3. Stable constant flow rate payout can be realized.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an ultra-trace amount powder / granular substance constant flow rate supply device of the present invention.

FIG. 2 is an explanatory diagram of a switching state of the switching valve of the same embodiment.

FIG. 3 is an explanatory diagram of a payout principle of the ultra-fine powder and granular material constant flow rate supply device of the present invention.

FIG. 4 is a configuration diagram of a specific example in which vibration is applied to a stick at a discharge position.

FIG. 5 is a cross-sectional view of a screw feeder.

[Explanation of symbols]

 4 Stick 8 Powder 12 Vibrating device 13 Scales 18 Fluid adjustment means 19 Switching valve 20 Pump 21 Control section

Claims (4)

[Claims] 1. A flexible structure capable of varying the surface area according to the amount of fluid to be injected, and moving between a position in contact with a granular material contained in a container and a discharge position different from the container. A stick attached so that it can be attached, a fluid adjusting means for adjusting the amount of fluid injected into the stick, a vibrating device for vibrating the stick at the discharge position, and a weight of the amount of powder and granules in stock. And a control unit for operating the fluid adjusting means so that the weight reduction change amount of the balance approaches a target value. 2. The container has flexibility such that its surface area can be changed according to the amount of fluid to be injected, and moves between a position in contact with a powder or granular material contained in a container and a discharge position different from the container. A stick that is movably attached, a fluid adjusting means that adjusts the amount of fluid injected into the stick, a charging device that charges the stick at a position where it contacts the powder or granular material contained in the container, A vibrating device for vibrating the stick, a scale for measuring the weight of the amount of powder and granules in stock, and a control section for operating the fluid adjusting means so that the weight reduction change amount approaches the target value. Ultra-fine powder granule constant flow rate supply device. 3. The container has flexibility such that its surface area can be changed according to the amount of fluid to be injected, and moves between a position in contact with the granular material contained in the container and a discharge position different from the container. A stick that is movably attached, a fluid adjusting means that adjusts the amount of fluid injected into the stick, a charging device that charges the stick at a position where it contacts the powder or granular material contained in the container, A static eliminator for eliminating static electricity on the stick, a scale for measuring the weight of the amount of powder and granules in stock, and a controller for operating the fluid adjusting means so that the amount of change in weight reduction of the scale approaches a target value. Ultra-fine powder granule constant flow rate supply device. 4. The container has flexibility such that its surface area can be changed according to the amount of fluid to be injected, and moves between a position in contact with the granular material contained in the container and a discharge position different from the container. A stick that is movably attached, a fluid adjusting means that adjusts the amount of fluid injected into the stick, a charging device that charges the stick at a position where it contacts the powder or granular material contained in the container, A vibrating device that gives vibration to the stick, a static eliminator that eliminates static electricity from the stick at the discharge position, a scale that measures the weight of the amount of powder and granules in stock, and a weight reduction change amount of the scale to a target value. A constant flow rate supply device for ultra-fine particles provided with a control section for operating the fluid adjusting means so as to approach.