JPH0620567Y2 - Quantitative mixing device for multiple types of powder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a quantitative mixing device for a plurality of types of powder and granular materials, and in particular, a u-type linear shooter is used as a feeder for pellet material as a plastic raw material, and a servo is used. By controlling the injection speed of the pellet material by controlling the tilt angle according to the angle of repose by the motor or rotary solenoid or by the weight of the pellet material itself, it is possible to accurately weigh from a small amount to a large volume, and a wide variety of products The present invention relates to an apparatus for quantitatively mixing a plurality of types of powder and granules suitable for production.

[Prior Art] In the conventional plastics industry, when molding and processing, a plurality of various materials are measured at respective ratios, for example, by electronic gravimetric measurement, and then the main raw material pellet pigment and other powdery additives are mixed in a mixer. After mixing and passing through an extruder or a molding machine, colored plastics and the like have been commercialized.

However, in recent years, along with the remarkable progress of the industrial world, there has been a tendency toward higher quality of products, high-mix, low-volume production, and demands for them have become strong.

In order to meet these demands, even in the case of various types of pellet materials, from small amount measurement to large volume measurement, the amount of each pellet material input from each material storage tank to the weighing hopper according to the demand of the product Accurate control and shortening of the feeding speed, and further simplification of cleaning or omission of cleaning due to the residual pellet material, which has been considered as a difficulty of various conventional feeder systems, is the reason for the color change work of colored plastic. It has been especially needed.

[Object of the Invention] The present invention has been made in view of the above circumstances. In response to the demand for high-mix low-volume production, in particular, a u-type linear shooter is used to feed each material storage tank into a weighing hopper. According to the above, it is an object to provide a quantitative mixing device for a plurality of types of powder and granules, which can accurately measure a small amount of pellet material in a large volume in a short time, and also solves the cleaning problem due to the residual pellet material. .

[Key points of the invention] This invention uses a u-type linear shooter to feed each kind of material storage tank that stores a plurality of types of pellets into a weighing hopper. This is a quantitative mixing device for powder and granular material.

[Structure of Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As is known from the plan view shown in FIG. 1 and the front view showing a partial cross section shown in FIG. 2, as an embodiment of the quantitative mixing apparatus for powder and granules of the present invention, the material storage tanks 1 and 2 are shown. , 3 each contain three kinds of raw materials, that is, a virgin pellet A as a main raw material, a sub virgin pellet B and a color pellet C as an additive will be described.

Directly below the material storage tanks 1, 2 and 3 is provided a linear shooter 4 having a cross section or a substantially u shape as shown in the plan view of FIG. 3 and the side view of FIG.

Each of the linear shooters 4 has a lower bottom fixed to a shaft 5, one end of which is connected to a servomotor 6 or a rotary solenoid, and the other end is rotatably supported by a support 7. .

The servomotor 6 and the support body 7 are fixed to an upper plate 9 of a container 8 that houses a mixing tank and the like.

The tilt angle of the linear shooter 4 can be arbitrarily changed by the drive control of the servo motor 6, that is, the tilt angle determined by the angle of repose of each pellet. This makes it possible to adjust the amount and speed of pellet material input.

Measuring hoppers 10, 11 and 12 are provided in the container 8 at the receiving ports of the pellets which are introduced by inclining the linear shooter 4 when weighing arbitrary pellets A, B and C, respectively. The weighing hoppers 10, 11, 12 are provided with weighing load cells 13, 14, 15 respectively. When a predetermined amount of pellets are weighed by the weighing hoppers 10, 11, 12, the opening / closing cylinders 16, 17, for the respective weighing hoppers,
18 is driven to drop the respective measured pellets into the mixing tank 19. The plurality of types of pellets dropped in the mixing tank 19 are mixed by driving the mixing motor 20 to rotate the rotary vanes 23 via the bevel gear 21 and the pipe-shaped rotary shaft 22.

A plurality of types of mixed pellet materials are moved up and down by the solenoid 24 shown in FIG. 5 and the mixing gate 25 connected to the gate shaft 24-1 is opened at the center of the pipe-shaped rotating shaft 22,
After being collected in the hopper 26 and detected by the material level detection sensor 27 that a predetermined amount of pellet material has been collected, the material is sent from directly below the hopper 26 to an extruder or a molding machine.

In the embodiment described above, the linear shooter 4 is tilted in the direction in which the corresponding pellet materials A, B, C are loaded into the respective weighing hoppers 10, 11, 12, and the tilt angle corresponding to the repose angle is set. Although the example in which the amount and speed of the pellet material can be adjusted by control has been described, the linear shooter 4 is tilted in the direction opposite to the direction in which the pellet material is weighed, and the discharging operation is added to the pellet for color change. With reference to FIG. 5, description will be given of an embodiment in which a highly accurate product can be obtained in a short time without wasteful replacement of materials and omitting the cleaning operation. In FIG. 5, the same parts as those in FIGS. 1 to 4 are designated by the same reference numerals, and the description of the structure will be omitted.

The linear shooter 4 just below the material storage tank 1 is positioned horizontally, and the virgin pellet A as the main raw material is
It shows a stationary state in which the stocking operation is finished. The weighing hopper 10 is provided directly below both ends of the linear shooter 4.
And a guide chute 28 for discharge return are provided, and the guide chute 28 for discharge return is the material return hose 2
It is connected to the material storage cyclone hopper 30 via 9.

The material storage cyclone hopper 30 is connected to the material storage tank 1 via a material feed hose 31.

The linear shooter 4 just below the material storage tank 2 is in a state of being tilted by rotating counterclockwise for charging the auxiliary virgin pellet B into the weighing hopper 11. The weighing hopper 11 and the discharge return guide chute 32 are provided immediately below both ends of the linear shooter 4, and the discharge return guide chute 32 is connected to a material storage cyclone hopper 33 via a material return hose 34.

The material storage cyclone hopper 33 is a material feeding hose 3
It is connected to the material storage tank 2 via 5.

The linear shooter 4 just below the material storage tank 3 finishes charging a predetermined amount of the color pet C into the weighing hopper 12, and when the color changing operation is performed, the linear shooter 4 is rotated clockwise to incline and the material storage tank 3 The state at the time of discharging for discharging the color pellet C therein is shown. The measuring hopper 13 and the discharge return guide chute 36 are provided immediately below both ends of the linear shooter 4, and the discharge return guide chute 36 is connected to a material storage cyclone hopper 38 via a material feed hose 37. .

The material storage cyclone hopper 38 is used for the material feeding hose 3
It is connected to the material storage tank 3 via 9.

The material storage tanks 1, 2 and 3 are connected to a blower 43 via material suction hoses 40, 41 and 42, respectively, and control the intake / exhaust operation of the blower 43 in the middle thereof, and the material storage tanks 1, 2, 3 An intake / exhaust switching valve 44 for suctioning and discharging each of the materials therein is provided.

The blower 43 also includes exhaust air hoses 45, 46, 4
7 through the discharge return guide chute 2
8, 32, 36 for returning the material to the material storage cyclone hoppers 30, 33, 38 via the material return hoses 29, 34, 37 during the material discharge during color change, and these cyclones. Hoppers 30, 33, 3
8. An exhaust pressure feeding switching valve 48 for controlling the operation for returning the material from the material storage tanks 1, 2, 3 through the material return hoses 29, 34, 37 is provided.

Further, an air blow 49 is provided on the weighing hoppers 10, 11, 12 and the discharge return guide chutes 28, 32, 36, and further below the mixing tank 19 and at an arbitrary position of the container 8 on the hopper 26. Are provided respectively,
The inside of each is cleaned by air blow.

[Operation of Embodiment] Next, the operation of the quantitative mixing apparatus for a plurality of types of powder and granular material of the present invention configured as described above will be described.

Since the description of the embodiment shown in FIGS. 1 to 4 can be similarly made in the description of FIG. 5 in which the same parts are designated by the same reference numerals, the description will be given together with the description of the operation of the embodiment of FIG. .

First, the intake / exhaust switching valve 44 is brought into the intake state by driving the blower 43. As a result, the virgin pellet A as the main raw material previously stored in the material storage cyclone hopper 30 is sent to and filled in the material storage tank 1. Similarly, the sub-virgin pellets B in the material storage cyclone hopper 33 and the color pellets C in the cyclone hopper 38 are sent to the material storage tanks 2 and 3 and filled therein.

Depending on the plastic product, the pellets in the tanks 1, 2 and 3 are weighed according to a predetermined weight ratio to the weighing hoppers 10, 11, through the linear shooter 4.
It is put into 12 and weighed. The linear shooter 4 at the time of this weighing is set to an inclination angle corresponding to the angle of repose of each pellet toward the pellet inlet of each weighing hopper,
The pellet loading and rate are controlled. The rotation of the linear shooter 4 may be clockwise or counterclockwise. Pellets A, B, which fall from the material storage tanks 1, 2, 3 onto the linear shooter 4,
Even if the amount of C is very small, the inclination angle due to the weight of the pellet is set to be small and the amount of C is adjusted minutely to accurately measure
0, 11, 12 can be charged, and in the case of measuring a large volume of pellets, if the inclination angle is made large, a large volume of pellets can be charged by accelerating the charging speed.

Further, the cross section of the linear shooter 4 is in the shape of a u-shaped trough, and even if it is slightly inclined, it can be reliably put into the weighing hopper without leaving pellets, and cleaning is unnecessary.

The amount of pellets charged in the weighing hopper is measured by the respective load cells 13, 14, 15 and the measured pellets are respectively measured by the weighing hopper opening / closing cylinder 1
The respective gates are opened by 6, 17 and 18 and dropped into the mixing tank 19. The pellet materials mixed in the mixing tank 19 are collected in the hopper 26, and then extracted into the extruder 50 or the molding machine for each batch.

Next, a case will be described in which the measurement and mixing operations for a desired product are completed and the color changing operation is performed.

If all of the main pellets A, the sub-pellets B, and the color pellets C are to be replaced prior to the color changing operation, the measuring cup 1 is replaced by the air blow 49.
Cleaning of 0, 11, 12 and the inside of the mixing tank 19 is performed by air blow.

When the operation of charging a predetermined amount of pellets is completed, the linear shooter 4 is returned to the horizontal position. For example, as shown in FIG. 5, when only the color pellets C are replaced, the linear shooter 4 is rotated clockwise by the servo motor 6 and tilted to remove the color pellets C in the material storage tank 3. All are put into the guide chute 36 for discharge return. At this time, the blower 43 is driven to an exhaust state, the switching valve 48 is switched to exhaust, and the exhaust return guide chute 36 is exhausted via the exhaust air hose 47. As a result, the color pellets C in the discharge / return guide chute 36 are returned to the material storage cyclone hopper 38 via the material return hose 37 and accommodated therein. The color pellet C returned into the material storage cyclone hopper 38 drives the blower 43 to the intake state, and when the switching valve 44 is switched to the intake state, the material storage tank 3 via the material feed hose 39. Can be returned to.

Since the operation of replacing the color pellet C is the same for each of the pellets A and C in the material storage tanks 1 and 2, the description thereof will be omitted.

In this way, a circulation system is formed between the material storage tanks 1, 2 and 3 and the material storage cyclone hoppers 30, 33 and 38, and the material pellets can be effectively used without being wasted.

[Effects of the Invention] The quantitative mixing apparatus for a plurality of types of powder and granules according to the present invention uses a linear shooter having a substantially u-shaped cross section as a feeder for pellet material as a plastic raw material, so that a small amount of pellet material can be measured. Since it is possible to accurately measure even a large amount of volume, and in particular, cleaning at the time of color change is not required in this linear shooter portion, pellet materials can be replaced in a short time, and it has an advantage suitable for high-mix low-volume production. Further, since the inside of the weighing hopper and the inside of the mixing tank are cleaned by air blow, the cleaning at the time of color change is simplified.

Furthermore, all the residual pellets in the material storage tank are once returned to the material storage cyclone hopper at the time of color change, and again,
Since it is sent to the material storage tank, it has advantages such as no waste of pellet material.

[Brief description of drawings]

FIG. 1 is a plan view of an apparatus for quantitatively mixing plural kinds of powder and granules, which is one embodiment of the present invention, and FIG. 2 is a side view showing a part of the apparatus shown in FIG. 3 is a plan view of a linear shooter used in the device of the present invention, FIG. 4 is a side view of the linear shooter shown in FIG. 3 in a horizontal state, and FIG. 5 is a view of the device of the present invention. It is a figure which shows a systematic structural example. 1,2,3 ... Material storage, 4 ... Linear shooter, 10,1
1, 12 ... Measuring hopper, 19 ... Mixing tank.

Claims (2)

[Scope of utility model registration request] 1. A plurality of material storage tanks for respectively storing different powders and granules; a plurality of corresponding weighing hoppers for weighing a predetermined amount of powders and granules from each of the plurality of material tanks; A plurality of linear shooters provided between the weighing hopper and each of the weighing hoppers, the tilt angle of which can be freely adjusted according to the angle of repose of each of the granular materials, and the cross section of which is substantially u-shaped; A quantitative mixing device for a plurality of types of powder and granules, which comprises: a mixer for dropping and mixing the powder and granules weighed by each of the weighing hoppers; 2. A plurality of material tanks for respectively storing different powders and granules; provided for each of the material tanks, receiving the powders and granules falling from the respective tanks, rotating them in one direction, The angle of repose is changed according to the angle of repose of the powder to make a drop for weighing from one end, and the other direction is rotated, and the angle of repose is changed according to the angle of repose of each powder and the other A plurality of linear shooters that are rotatably supported by the ends of the linear shooters and that have a substantially u-shaped cross section; and are arranged below both ends of each of the linear shooters. A pair of weighing hoppers and a discharge return guide shooter; a mixer for dropping and mixing the powder particles weighed by each of the plurality of weighing hoppers; a plurality of discharge return guide shooters; Between each of the material tanks A material-storing cyclone hopper that is connected to the discharge tank, and that is provided so that the powder or granular material discharged from the discharge return guide shooter can be returned to the material tank again by pressure feeding; the plurality of material tanks, the discharge return guide shooter, and the A quantitative mixing device for a plurality of types of powder and granules, which is connected to a material storage hopper and is for driving powder and granules including a blower for transferring the powder and granules.