JPH02253835A - Mixing device for raw material of particulate matter - Google Patents

Abstract

PURPOSE:To exactly measure the weights of the raw materials of particulate matter while continuously supplying a raw material mixture and to continuously execute the operations up to mixing by weighing the weights of the raw materials of the particulate matter supplied from raw material supplying means by weighing means and comparing the weights with set values and then discharging the materials to a mixing means. CONSTITUTION:The weights of plural kinds of the raw materials of the particulate matter are respectively weighed by the weighing means 18, 28. The above-mentioned plural kinds of the raw materials of the particulate matter are supplied to the above- mentioned weighing means without contact therewith by the raw material supplying means 10, 12. Further, the raw materials measured by the weighing means are mixed in the mixing means 58. The weighing means measure the raw materials of the particulate matter supplied by the raw material supplying means, compare the same with the set values and discharge the materials to the mixing means. As a result, the weights of the raw materials of the particulate matter are exactly measured while the supply of the raw materials of the particulate matter to be mixed are continuously executed. The operations from the weighing up to the mixing of the raw materials of the particulate matter are thus continuously executed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing device for controlling the mixing amount by weight measurement, and particularly to a mixing device for powdery raw materials.

For example, in the production of plastic films and resin molded products? ji number of resin pellets are mixed and supplied in predetermined amounts, and melting, molding, rolling, etc. are performed. Therefore, in order to form a film or molded product with uniform quality, it is necessary to accurately measure the amount of resin pellets to be supplied.

Conventionally, in supplying such resin pellets, for example, the resin pellets were measured and mixed in a container such as a regular mass, or the resin pellets were weighed and mixed on an hourly basis from an outlet that allowed a constant amount of resin pellets to come out. This was supplied to the molding department. With this method, the specific gravity and resin pellet formation differ depending on the raw materials, making it difficult to mix accurately and make it difficult to produce a uniform product of one quality.Therefore, there was a need for equipment that could more accurately measure and mix.

1-Sword The present invention overcomes these drawbacks of the prior art.

The purpose of this method is to accurately measure the weight of the granular raw materials while continuously supplying the granular raw materials to be mixed, and to continuously carry out the process from weighing the granular raw materials to mixing.

According to the present invention, a powder raw material mixing device for mixing plural types of powder raw materials includes a measuring means for weighing each of the plural kinds of powder raw materials, and a non-measuring means. It has a raw material supply means that supplies a plurality of types of powder raw materials through contact, and a mixing means that mixes the powder raw materials measured by a measuring means, and the measuring means supplies powder grains supplied by the raw material supply means. After weighing the raw material and comparing it with a set value, it is discharged to the mixing means.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of a mixing apparatus for powdery raw materials according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1(a) shows a raw material supply section and a weight measurement section of a mixing device that mixes two types of granular raw materials.

The hoppers 10i5 and 12 contain powdered raw materials such as resin pellets, and the raw materials are alternately supplied from the hoppers 10j15 and 12 to the weighing hopper 18. First, hopper I
The raw material stored in O is sent to the weighing hopper lO by a raw material conveying pipe 14. The raw material conveying pipe 14 is the weighing hopper 1
The weighing hopper 18 is inserted into the hole 18a made in the weighing hopper 18 in a non-contact manner to approximately the center of the weighing hopper 18, and is arranged horizontally.

The raw material conveyance pipe 14 and the hopper 1O are connected by a connecting box 20, inside which a conveying spiral screw 22 is provided as shown in FIG. It is sent to approximately the center of the weighing hopper 18 and falls. In this case, a discharge port 32 opened at the bottom of the weighing hopper 18 is closed by a discharge shutter 30. In addition.

The operation of supplying and stopping the raw materials from the hoppers 10 and 12 is based on sequence control, which will be described later.

Two hanging members 18b are provided on the top surface of the lid 18c of the weighing hopper 18 at symmetrical positions with respect to the center.
A hook 24a of a hanging metal fitting 24 is inserted through the hole 18b. When the weighing hopper 18 is suspended by the hanging fitting 24, the weight sensor 28 is fixed to the device via the buffer-absorbing rubber 26 so that the support plate 24b supporting the hook 24a supports the horizontal fulcrum 24c. It is installed.

As shown in FIG. 1 (cl), the discharge shutter 30 consists of a tapered closing part 30a whose lower part is formed to match the shape of the discharge port 32, and a conical part 30b. It is quickly deposited in the lower part of the weighing hopper 18, and the center of gravity of the weighing hopper 18 is moved as downward as possible.
In addition, during discharge, there is little resistance of the raw material (it has the effect of being able to rise).A lifting rod 30c is connected to the discharge shutter 30 in order to open and close the discharge port 32, and the lifting rod 30c
is the hole 1 bored in the center of the lid 18c of the weighing hopper 18.
8d without contact, and a disk 30d is provided at the top thereof. Therefore, when the raw material is measured by the weighing hopper 18, the discharge shutter 30 is supported at the bottom of the weighing hopper]8.

When the weight sensor 28 senses that a set weight of raw material has been supplied to the weighing hopper 18, a discharge opening/closing mechanism 34 fixed to the mixing device is activated. That is, the cylinder 34a is driven, and the elevating plate 34c is raised via the cylinder 34a and the piston 34b. Elevating plate 34
A notch 34d is formed at the tip of c, and the lifting rod 30c is sandwiched therein without contact. Notch 34d
The area of the notch 3 is smaller than that of the disk 30d.
The rising distance of 4d is from the bottom surface of the disk 30d to the notch 3.
The distance from the portion 4d to the upper surface of the elevating plate 34c is made larger. Therefore, when the discharge opening/closing mechanism 34 operates to the "discharge amount", the disk 30d is raised by the lift 1j34c, and as a result, the discharge shutter 30 is raised as shown by the dotted line in FIG. 1 (cl). The raw material falls from the outlet 32 as shown by the dotted line.

When the weight sensor 28 senses that the discharge of the raw material is completed, a "discharge amount" operation is started, and the elevating plate 34c descends, and the disk 30d leaves contact with the elevating plate 34c. For this reason, the lifting rod 30c falls freely, and as shown in FIG.
The outlet 32 is closed by the closing portion 30a as shown by the solid line in FIG.

Next, other granular materials are transferred from the hopper 12 to the weighing hopper 18.
The liquid is supplied to the container, is metered through the same process as above, and falls from the discharge port 32.

FIG. 2 (al [b)] shows the overall configuration of an embodiment of a mixing device for mixing three types of raw materials.

FIG. 2fa) is a front view of the mixing device, and FIG. 2(b) is a side view thereof.

The raw materials stored in the hoppers 36, 38 and 40 are driven by transport motors 42, 44 and 46 to pass through the raw material transport pipe, and the raw materials stored in the hopper 36 are transferred to the weighing hopper 50.
At the same time, the raw materials contained in the hoppers 38 and 40 are supplied to the weighing hopper 52. The raw material supplied to each weighing hopper is measured by the weight sensor 28 in the load cell section 48 (Fig. 1(a)).
After being weighed, it falls into the mixing tank 58 from the discharge ports 54i5 and 56 of the weighing hoppers 50 and 52. At this time, the weighing hoppers 50 and 52 and the mixing tank 58 are not in contact with each other.

The raw material in the mixing tank 58 is transferred to the mixing motor 60.
After mixing, the raw material discharge cylinder 62 is driven to drop the mixed raw material receiver into the hopper 64 through a discharge shutter (not shown). The amount of mixed raw materials in the mixed raw material receiver hopper 64 is monitored by a level sensor 66.

The control panel 68 is provided with a metering setting switch 72 for setting the mixing ratio and amount of each raw material, a display 70 showing the actual mixing ratio and amount, and a built-in A/D converter and a microcomputer (both not shown). ) is installed.

The flow of the operation of the device explained above is shown in Fig. 3(a)(bl).
The flow shown in Figure 3 (al) is an example in which, in mixing two types of raw materials, first the A raw material is weighed and discharged in the weighing hopper, and then the B raw material is weighed and discharged. Figure (b
) is an example in which the A raw material is not discharged after being weighed, raw paddy is added for one day, the total of the A and B raw materials is weighed, and later the A and B raw materials are discharged at the same time.

Next, FIG. 4 shows an example of a block diagram of the program and rumble controller during the operation sequence of mixing two types of raw materials. 82
is attached. The signals from the weight sensors 28a and 28b are amplified by amplifiers 74a and 74b, respectively, converted from analog signals to digital signals by A/D converters 76a and 76b, and input into the CPLI unit 80 through the human interface 7a. . On the other hand, signals from a total of 1 setting switches 72a and 72b are sent to the CPU unit 80 through the input interface 78.
is pre-entered and memorized. The CPU unit 80 outputs drive signals to the transport motors 16a and 16b through the output interface 82 until the converted digital amounts sent from the 1 weight sensors 28a and 28b match the stored set amounts.

j Converted digital 1 from JTffi sensors 28a and 28b and total 1 setting switch 72a i3 and 7
If the digital amount set from 2b matches, the CPU
The unit 80 sends a stop signal to the transport motors 16a and 16b via the output interface 82, and after a predetermined short period of time has elapsed, the ejection opening/closing mechanism 34 is activated.
− signal is output, and then a drive signal is output to the mixing motor 60.

The discharge of the raw material is completed when it is detected from the signal from the weight sensor 28a or 28b that the weight of the weighing hopper is equal to the tare. When the discharge of raw materials is finished, the CPU unit 8
A signal indicating the amount of "discharge" is sent from 0 to the discharge opening/closing mechanism section 34 via the output interface 82. The mixing motor 60 stops after the time set in the CPU unit 80 has elapsed. The following sequence returns to the initial operation.

The CPU unit 80 sets and sets the sequence of the above-mentioned operations.
In addition to issuing a command, the accurate actual weight of the five raw materials is calculated by calculating the weight effect of the discharge shutter on the tare of the weighing hopper, that is, the effect that is added when weighing raw materials and becomes zero when discharged. Furthermore, the rotational speed of the conveyance motor is controlled so that the speed at which raw materials are sent to the weighing hopper is changed between the start and the end. Furthermore, the timing of supplying raw materials to the weighing hopper and discharging the raw material from the weighing hopper can be optimized by taking into account the inertia of each part of the apparatus.

As explained above, according to this embodiment, multiple raw materials can be continuously supplied, measured, and mixed, eliminating the need and inconvenience of transferring raw materials to be measured into containers as in the conventional method. The weighing hopper is equipped with a weight sensor at the fulcrum, and by always inputting and discharging raw materials on the vertical line of the center of gravity of the weighing hopper, the five weight sensors can always detect the weight of the raw material to be measured. Further, since a signal is continuously sent from the weight sensor, by processing this signal in the CP[J unit, it is possible to not only calculate the actual weight of the raw material but also control the timing of weighing and mixing to the optimum speed.

To summarize the features of the present invention in more detail, the ill material transport pipe does not come into contact with the weighing hopper, so it does not interfere with weighing.

(2) The raw material is dropped onto the vertical line of the center of gravity of the weighing hopper to suppress lateral vibration of the weighing hopper.

1) Since raw materials are supplied through the hole on the side of the weighing hopper, it is difficult for dust and dirt to enter.

(4) The weighing hopper is suspended and supported above the vertical line of the center of gravity, and one weight sensor is installed, so there is a total of one weight sensor.
Accurate weight measurement is possible without considering the uneven effect of the way raw materials enter the hopper.

(5) The discharge shutter of the weighing hopper was made to fall on the vertical line of the center of gravity to minimize the impact on the weight sensor.

(6) The lower part of the discharge shaft of the weighing hopper is made into a conical shape,
The material that has fallen into the weighing hopper is easily deposited downward, the sealing force of the discharge port is increased, and the resistance of the material is eliminated so that it can be easily pulled up.

(7) The discharge shaft of the weighing hopper is used when weighing raw materials.
Contact is made only at the weighing hopper and discharge port, allowing for stable weight measurement.

(8) A microcomputer that processes continuous signals from the weight sensor allows accurate weighing, calculation of integrated quantity, and setting and control of optimal raw material supply, metering, and mixing speed.

According to the present invention, granular raw materials can be continuously and accurately measured and
It can be mixed and the time required for the process can be optimized, eliminating the need for separate processes for weight measurement and mixing.

[Brief explanation of drawings]

1b+ is a perspective view showing an embodiment of the mixing device for powdered raw materials according to the present invention, FIG. 1b+ is a cross-sectional view of the raw material conveying mechanism of FIG. 1(a), and FIG. FIG. 1 is a diagram illustrating the functions of the discharge port and discharge shutter of the weighing hopper in FIG. 1a). Fig. 2fa) is a front view showing another embodiment of the present invention, Fig. 2(b) is a side view of the device of Fig. 2(a), Fig. 3i
a) is a flow diagram showing the operation of the device in FIG. 1 (al); FIG. 1b+ is a flow diagram showing other operations of the device in FIG. It is a block diagram showing a control unit that controls the following.Main 1. Explanation of 10.12 , Hopper Raw material conveying pipe Conveying motor Weighing hopper Weight sensor Discharge shutter Discharge port Discharge opening/closing mechanism Cylinder Elevating plate Mixing tank Mixing The motor mixed material receiver is the hopper control panel metering setting switch CPU unit

Claims (1)

[Scope of Claims] 1. A powder and granule raw material mixing device for mixing a plurality of types of powder and granule raw materials, the device comprising: measuring means for weighing each of the plurality of types of powder and granule raw materials; , a raw material supply means for supplying the plurality of types of granular raw materials to the measuring means in a non-contact manner, and a mixing means for mixing the granular raw materials measured by the measuring means, the measuring means The apparatus for mixing powder and granular raw materials is characterized in that the powder and granular raw materials supplied by the raw material supplying means are weighed and compared with a set value, and then discharged to the mixing means. 2. The apparatus according to claim 1, wherein the weighing means is a hanging weighing hopper, and the weighing hopper is supported by a weight sensor. 3. The apparatus according to claim 2, wherein the raw material supply means supplies the powdered raw material through a conveying pipe inserted into the weighing hopper from the lateral direction. . 4. In the apparatus according to claim 2, the weighing hopper is provided with a discharge port closing member at the bottom of the weighing hopper on a vertical line passing through the center of gravity of the weighing hopper, and the granular material is weighed. A mixing device for powdered raw materials, characterized in that the discharge port closing member is then raised to allow the raw materials to fall. 5. The device according to claim 2, further comprising:
It has a control means that processes signals continuously obtained from the weight sensor and controls the measurement of the weight of the powdered raw material to be mixed, the amount of supply to the weighing hopper, and the timing and speed of supply and discharge. A mixing device for powder and granular raw materials, characterized by: