JP2000301537A - Automatic feed device for master batch which can change color in a short time - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic feed device for master batch which can change colors in a short period of time wherein cleaning can be performed easily and completely when colors are changed and colors can be prevented from being mixed with each other. SOLUTION: The automatic feed device includes MB tanks 1 for storing master batches of different colors, respectively, an MB color selecting means 3 for selectively feed a master batch of desired color from master batches of different colors fed through each of exclusive MB transporting pipes 2 to feed it only to a succeeding step, and an MB metering feed device 5 having the MB color selecting means 3 and a color changing and cleaning means 4 and provided at the upper part of a material feed hopper D. When the master batches are supplied from the means 3 to change colors of the master batches, master batches of previous colors remaining in the device 5 are automatically cleaned by the means 4 and then master batches of new colors are received.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for automatically supplying a masterbatch which can be added to a molding material of a resin molding machine in a short time to change the color of the masterbatch.

[0002]

2. Description of the Related Art In a plastic molding machine for plastic molded products,
The supplied resin molding material is composed of a natural material (may be abbreviated as “N material”) and a master batch (may be abbreviated as “MB”). This natural material is the main component of the resin molding material, and refers to a material that does not contain additives and the like. On the other hand, a master batch is a material that is substantially equivalent to the natural material, and further includes a coloring agent, Additives such as stabilizers, antistatic agents, and flame retardants are contained in high concentrations.By adding this master batch to natural materials, the above various additives are added and colored. , Usually supplied in pellet form.

[0003] These natural materials and the masterbatch are mixed and supplied to a resin molding machine.
At the same time the mixed resin molding material is kneaded and plasticized,
The additives in the master batch are dispersed throughout to form a resin molded product. In addition, coloring of the resin molded product is also performed using a master batch containing a coloring agent, and changing the color of the resin molded product means changing the color of the master batch supplied and mixed with the natural material.

In order to change the color of the master batch, it is necessary to prepare a plurality of master batches of different colors or to prevent color mixture with a previous color. Various proposals have been made.

FIG. 5 is an overall configuration diagram conceptually showing such a conventional master batch automatic supply apparatus.

[0006] The automatic supply device 110 is a resin molding machine A
It is possible to supply master batches of different colors to the material supply hopper D. Natural materials are appropriately supplied to the material supply hopper D by supply means (not shown), and mixed with the master batch by the material supply hopper D. Then, it is supplied to the resin molding machine A to color the resin molded product.

The automatic supply device 110 includes a plurality of MB tanks 101 for storing master batches of different colors, that is, master batches containing different colorants, and an MB transport pipe 10 provided exclusively for the MB tanks 101.
2, an MB storage hopper 103 that receives supply of master batches of different colors from the MB transport pipes 102, a weighing device 104 that weighs the master batch stored in the MB storage hopper 103, and a weighing device that is weighed from the weighing device 104. The master batch received by the receiving portion 105a and collected by the collector 1 provided on the material supply hopper D of the resin molding machine A
A transport pipe 105 for transporting the transport batch 06 and a collector 106 for separating transport gas from the transported master batch and collecting only the master batch.

The masterbatch automatic feeder 110
In the case of changing the color of a masterbatch, the masterbatch of a different color is supplied from the MB tank 101 of the masterbatch of a different color via the dedicated MB transport pipe 102 after the masterbatch of the previous color is lost. And resin molding machine A
Since it is only necessary to supply the material to the material supply hopper D, the color changing operation is easier than in the past, and there is no need to provide extra equipment on the resin molding machine A, and the existing equipment It was easy to add and install.

[0009]

However, in the above-mentioned conventional automatic supply device 110, in order to avoid color mixture at the time of color change, there is a possibility that a previous color may remain in the MB.
Storage hopper 103, measuring instrument 104, transport piping 105,
It was necessary to clean the entire collector 106, and it took a lot of time to change colors. In particular, in the transport pipe 105,
In some cases, a large amount of masterbatch adheres due to transportation friction and the like, and it is difficult to completely remove the masterbatch, sometimes causing a problem of color mixing.

An object of the present invention is to solve the above-mentioned problem, and to provide an automatic master batch supply apparatus which can easily and completely clean at the time of color change, does not cause color mixing, and can perform color change in a short time. It is intended to be.

[0011]

According to the present invention, there is provided an automatic feeder for supplying a masterbatch of a different color to a material supply hopper of a resin molding machine. There are MB tanks for storing master batches of different colors, and these MBs
MB color selecting means for selectively supplying only a master batch of a desired color to the next process from master batches of different colors supplied from tanks through dedicated MB transport pipes, and the MB color selecting means and color changing cleaning And a MB weighing and feeding device installed above the material feeding hopper. When the color of the masterbatch supplied from the MB color selecting device is changed, the MB remains in the MB weighing and feeding device. The master batch of the previous color is automatically cleaned by the color change cleaning means, and then a new color master batch is supplied.

Here, when referring to a masterbatch or a natural material, it may refer to an aggregate thereof.
In addition, one of the grains may be referred to.

[0013] This automatic feeding device is designed to minimize the portion where the masterbatch of the previous color may remain at the time of color change, that is, in the conventional example, the automatic feeding device is provided separately from the resin molding machine. The MB metering / supplying device, which has been used, is provided on a resin molding machine, thereby eliminating a transport pipe used in the conventional example. Therefore,
The number of parts to be cleaned for color change is very small as only the MB metering device, and the cleaning is easy. In addition to the reduction of the parts to be cleaned, this part is, due to its structure, a master due to friction. Batch adhesion is less likely to occur, and cleaning is easy and complete.

The automatic feeder also has an M
In order to cover the difficulty of positional cleaning by providing the B metering and feeding device on the resin molding machine, this MB
It is also characterized in that a color changing cleaning means for automatically cleaning the metering and feeding device is provided. As described above, the MB metering / supplying device has a structure in which the remaining masterbatch can be easily cleaned, as compared with the related art. A simple structure that blows out air is sufficient, and M
It can be attached to the B metering and feeding device, and the cleaning of the remaining master batch can be automatically performed by the color changing and cleaning means. Further, the time for color changing can be shortened, and labor for manual operation can be saved.

The MB provided in the automatic supply device
The color selection means is, of course, necessary for selecting a masterbatch of a desired color from the MB transport tube receiving the supply of the masterbatch of a different color. The structure does not hinder cleaning.

According to a second aspect of the present invention, there is provided an automatic master batch supply apparatus capable of changing colors in a short time, wherein the MB tanks for storing the master batches of different colors are separately provided from the resin molding machine. It is characterized by having been done.

In this automatic supply device, since the MB tank is separately provided, an unnecessary MB tank or the like is not provided on the resin molding machine, and it is easy to additionally install the resin molding machine on an existing resin molding machine. Master batches of different colors can be similarly supplied from a separately placed MB tank to a plurality of resin molding machines, thereby saving installation space as a whole.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual overall configuration diagram of an example of an automatic master batch supply apparatus capable of changing colors in a short time according to the present invention. In this figure, the same parts as those in FIG. 5 of the conventional example are denoted by the same reference numerals, and redundant description will be omitted.

This master batch automatic feeder 10
Is an MB containing masterbatches of different colors
A tank 1, an MB transport pipe 2 provided exclusively for each MB tank 1, and a master batch of a different color supplied from each MB transport pipe 2 from among the MB transport pipes 2; 2, the MB color selecting means 3 to be supplied to the next step, the color change cleaning means 4 for cleaning the discharge side of the MB color selecting means 3 and the master batch remaining in the MB measuring and supplying device 5, the MB color The master batch provided at the lower portion of the selection means 3 receives the supply of the master batch selected from the MB color selection means 3, measures the master batch, and supplies a predetermined amount to the material supply hopper D of the resin molding machine A.
It comprises a metering / supplying device 5, a control panel 6 for controlling the injection molding process of the resin molding machine A, and the timing of masterbatch supply, and the like.

Here, the control panel 6 has a close relationship with the automatic supply device 10 in terms of exchange of control signals, but a device directly related to the function of the automatic supply device 10 in terms of the device configuration. is not. 7 is a resin molding machine A
This is a mixing unit provided as necessary to further uniform the mixing of the natural material supplied by the supply means (not shown) to the material supply hopper D and the master batch supplied by the automatic supply device 10. It is not essential to the invention.

The MB tank 1 has a lower limit level meter 1a for detecting the remaining amount of the stored master batch, a discharge port 1b for discharging the remaining master batch, and a manual valve 1c for manually opening and closing the discharge of the master batch. Discharge pipe 1 provided with
d are provided respectively.

The MB transport pipe 2 is a discharge pipe 1 of the MB tank 1.
d, the MB transport means 2a, and the MB transport means 2
a transport pipe 2b for the master batch transported by a, a transport air valve 2c for controlling transport air for receiving the supply of pressurized air and sending the master batch in the MB transport means 2a together with air to the transport pipe 2b; After the master batch is transported by air, a cleaning air valve 2d is provided for controlling the cleaning air for cleaning the inside of the transport pipe 2b after transporting by sending air from a portion of the MB transport means 2a where the master batch is not provided. Have been.

Each of the MB transport pipes 2b is dedicated to a single-color masterbatch. Therefore, even if the masterbatch adheres and remains here, there is no problem of color mixing. Also, since it is provided for each masterbatch, it is not necessary to make the diameter too large with respect to the outer diameter of the masterbatch. Specifically, a polyethylene tube having an inner diameter of about 13 mm and an outer diameter of about 16 mm is cost-effective. Although it is preferable in terms of ease of installation, the present invention is not limited to this.

MB color selection means 3, color change cleaning means 4, M
The outline of the B metering / supplying device 5 will be described here.
This will be described in detail with reference to the following drawings.

As shown in this figure, the color changing cleaning means 4 receives the supply of pressurized air, and discharges the MB color selecting means 3 to be described later, the inlet side and the outlet side of the main body of the MB measuring and supplying device 5. Cleaning control valves 4d, 4e, and 4f for controlling the opening and closing of the cleaning air to the cleaning nozzle provided in the cleaning machine, and the cleaning air provided in the material supply hopper D of the resin molding machine A to collect the remaining master batch. And a collection bag 4h for collecting the separated master batch.

The MB metering / supplying device 5 has a collector 5e for collecting the master batch discharged and supplied from the MB color selecting means 3 in a process preceding the main body thereof. A filter 5g for separating and discharging the transport air of the batch, a fuel gauge 5f provided in the collector 5e for detecting the remaining amount of the master batch stored in the collector 5e.
Is provided. The main body is provided with a motor 5d for rotating the metering rotor, and a post-process of the main body is provided with a discharge pipe 5h for guiding the measured master batch to the material supply hopper D of the resin molding machine A.

The lower limit level meter 1 of the MB tank 1 is used.
a, the outlet 1b, the manual valve 1c, etc. are shown as an example of the embodiment and are not indispensable components of the present invention. Further, the MB transport means 2a of the MB transport pipe 2 has been described here in which the master batch is pressure-fed using pressurized air, but the transport method is not limited to this, and the method using suction or the like is used. Other methods may be used, and the method does not limit the automatic feeding apparatus of the present invention.

FIG. 2 is a conceptual diagram of the main parts showing in more detail the MB color selection means and the color change cleaning means of the automatic supply apparatus of FIG. 1. FIG. 2A is a top view of the MB color selection means. ,
(B) is a longitudinal sectional view from the MB color selection means to the MB metering and supply device. Therefore, the same reference numerals are given to the parts already described, and the repeated description will be omitted.

The MB color selecting means 3 includes a selecting rotor 3a having a selecting pipe 3b penetrating through a central portion and a portion of the outer diameter.
A selection rotation motor 3c for rotating the selection rotor 3a so that the rotation angle can be set; and a selection rotor case which accommodates the selection rotor 3a so as to be rotatable and is opened only in the direction of the center through-side opening of the selection conduit 3b. The selected rotor case 3d is located at a position that communicates with the outer diameter side opening of the selected conduit 3b of the selected rotor 3a and at a different position on the outer periphery of the selected rotor 3a, in this example. The MB transport pipe 2b that supplies master batches of different colors from the MB tank 1 is connected to a position where the outer circumference is divided into four equal parts.

Therefore, if the selection rotor 3a is rotated to maintain a rotation angle at which any one of the MB transport pipes 2b communicates with the outer peripheral opening of the selection pipeline 3b, the master from the communicated MB transport pipe 2b is maintained. The batch m falls downward from the center of the selection rotor 3a via the selection pipe 3b. In this way, the MB color selecting means 3 rotates the selecting rotor 3a and outputs the desired MB transport pipe 2
By holding the rotational position of the opening on the outer peripheral side of the selection conduit 3b at the position b and selecting it, a master batch m of a desired color can be supplied to the next step.

The selection line 3b of the selection rotor 3a
As shown in the figure, the outer peripheral portion provided with the outer diameter side opening is provided with a gradient, and the selected rotor case 3d and the MB transport pipe 2b also correspond thereto.
The master batch m smoothly flows from the MB transport pipe 2b to the selection pipe 3b and is less likely to be caught.

The MB metering / supplying device 5 includes a motor 5d (not shown in this figure), a collector 5e,
In addition to the fuel gauge 5f, the filter 5g, and the discharge pipe 5h, a measuring rotor 5a constituting the main body, a rotating shaft 5b thereof,
A metering rotor case 5c is provided.

The metering rotor 5a is a cylindrical body that has been knurled so that the master batch m can be caught on the outer periphery, rotates in the direction shown in the figure around the rotating shaft 5b, and places the master batch m on the outer periphery and discharges it. The master batch m is metered and supplied to the material supply hopper D of the resin molding machine A by discharging to the pipe 5g. The rotating shaft 5b is directly connected to the motor 5d and rotates the metering rotor 5a.

The metering rotor case 5c houses the metering rotor 5a.
The rotor 5a is configured to be rotatable and to prevent the master batch m from being caught in a gap between the rotor 5a and a side surface thereof. Also, a measuring gap 5aa for metering and transporting the master batch m is formed between the master batch m and the outer periphery of the rotor 5a. On the return side of the rotation of the metering rotor 5a, the master batch m is caught by the measuring rotor 5a. The filling ring 5cc that fills the measuring gap 5aa between the measuring rotor 5a and the measuring rotor case 5c is provided to prevent the return from occurring. The gap between the inner circumference of the filling ring 5cc and the outer circumference between the metering rotor 5a is configured so that the master batch m is not inserted.

A part of the portion corresponding to the outer periphery of the metering rotor 5a has a master batch m falling from the collector 5e.
Of the master batch m metered and conveyed by the metering rotor 5a into the discharge pipe 5h.
An outlet opening 5cb is provided for discharging the air to the outside.

By controlling the rotation speed of the metering rotor 5a, the amount of the master batch m supplied to the material supply hopper D can be controlled accurately enough.
By stopping the rotation, the master batch m
Supply can be stopped.

Reference numerals 4a, 4b and 4c denote cleaning nozzles constituting the color changing cleaning means 4, which are cleaning control valves 4d and 4d, respectively.
4e and 4f are connected and controlled. Cleaning nozzle 4a
Is provided at an intermediate portion of the collector 5e, and the MB
The master batch m remaining in the collector 5e is blown toward the metering rotor 5a. The cleaning nozzle 4b is installed near the inlet opening 5ca of the metering rotor case 5c, and blows the master batch m remaining near the metering gap 5aa between the metering rotor 5a and the metering rotor case 5c. The cleaning nozzle 4c is provided at the outlet opening 5c of the metering rotor case 5c.
The master batch m, which is installed in the vicinity of b and remains in this vicinity, is completely blown off from the metering rotor 5a toward the discharge pipe 5h.

The master batch m blown to the discharge pipe 5h side is supplied to the material supply hopper D of the resin molding machine A, and the collection bag 4 provided in the material supply hopper D is provided.
h and is reused. At this time, filter 4g
Separates the cleaning air from the cleaning nozzles 4a, 4b, 4c and discharges the air to the atmosphere.

In the master batch automatic supply device 10 having such a configuration, the color change of the master batch is performed in the following procedure. Here, No. No. 1 from the master batch stored in the MB tank 1 M of 4
A case where the color is changed to the master batch stored in the B tank 1 will be described as an example.

At the time of color change, first, from the control panel 6, the master batch m
No. was supplied. A transportation stop signal is sent to the transportation means 2a provided in the discharge pipe 1d of the tank 1 and the tank 1
Is stopped by the MB transport pipe 2b connected to the.
Next, the selection rotor 3a of the MB color selection means 3 is rotated to maintain a neutral position that does not communicate with any of the MB transport pipes 2b.

In this state, the MB color selection means 3
The master batch m is supplied to the collector 5e of the B metering device 5.
Is not supplied, and the remaining No. 1 MB tank 1
The masterbatch m of the color stored in is supplied to the material supply hopper D of the resin molding machine A until the masterbatch m of the color is measured by the MB metering device 5 and reaches a predetermined amount. Thereafter, the cleaning air is blown out from the cleaning nozzles 4a, 4b, 4c of the color changing cleaning means 4 while the metering rotor 3a is idly rotated, and the remaining master batch m is collected in the collection bag 4h. This color change cleaning is automatically performed according to a command from the control panel 6 according to a predetermined program.

Thereafter, the control panel 6 sends the No. The transport start signal is sent to the MB tank 1 of No. 4 and the transport means 2 a provided in the tank 1 sends the No. 4 to the MB color selecting means 3.
The master batch m stored in the MB tank 1 of No. 4 is transported, and the MB color selecting means 3 rotates the selection rotor 3 a from the neutral position, and The MB transport pipe 2b corresponding to the MB tank 1 of No. 4 communicates with the outer peripheral opening of the selected pipeline 3b. Thus, No. MB tank 1 of 4
The master batch m stored in the MB measuring and feeding device 5
And the material is supplied to the material supply hopper D of the resin molding machine A by the MB metering device 5.

In this manner, the color change is performed automatically and easily, so that the color change of the master batch can be performed in a short time, and the master batch of the previous color can be surely remained. Since they can be eliminated, color mixing can be avoided.

Further, since the MB tank 1 is not provided on the resin molding machine A but is provided separately, there is no need to provide an excessive number of devices such as an MB tank on the resin molding machine.
It can be easily installed on existing resin molding machines. Also,
Master batches of different colors can be similarly supplied from a separately placed MB tank to a plurality of resin molding machines,
As a whole, installation space can be saved.

The above-described color change procedure is shown as one of the embodiments, and includes the timing of transportation from the MB tank 1, the timing of color selection by the MB color selection means 3, and the cleaning of the color change cleaning means 4. And the timing of the stop and start of the metering by the MB metering means can be various combinations other than the above, and are not limited to the above.
FIG. 3A is a conceptual configuration diagram showing the overall configuration of another example of the MB metering device used in the automatic supply device of FIG. 1, and FIG.
Detailed sectional view of a main part of a measuring roller of the MB measuring and feeding device,
FIG. 4 is a detailed cross-sectional view of a main part of the measuring roller of FIG. 3A taken along a section perpendicular to FIG. 3A.

The MB metering and feeding device 5 described with reference to FIG.
Is to measure the master batch m by the catch of the measuring rotor 5a and the measuring gap 5aa, but the same amount of the master batch m is not always transported in accordance with the rotation of the measuring rotor 5a. However, it was not possible to cope with the case where the amount of the master batch m to be added required more strict accuracy, for example, the accuracy required for one grain unit. The MB metering / supplying device 5A shown in FIGS. 3 and 4 is suitable when such a stricter masterbatch addition amount accuracy is required.

The MB metering / supplying device 5A includes a collector 51 for collecting the master batch m supplied from the MB color selecting means 3, and an adsorption hole 54, and the master batch m stored in the collector 51 A weighing rotor 52 that adsorbs, separates, counts, and discharges a single particle, a rotating shaft 53 that rotatably supports the weighing rotor 52, a rotor case 55 that fixedly supports the rotating shaft 53, and houses the weighing rotor 52; The master batch m discharged from the metering rotor 52 is provided with a material discharge pipe 58 for guiding the master batch m to the material supply port B of the resin molding machine A.

The collector 51 detects a remaining amount of the master batch m and outputs a material replenishment signal to a remaining amount detection sensor 51a.
And a cleaning nozzle 41, a filter 42, and a collection bag 43 for cleaning and collecting the remaining master batch m at the time of color change. The cleaning nozzle 41, the filter 42, and the collection bag 43 are the same as the cleaning nozzle 4a, the filter 4g, and the collection bag 4h described with reference to FIG. 2, and the color changing cleaning unit 4A for the MB metering device 5A. Is composed.

The metering rotor 52 has a thick cylindrical shape and is provided with suction holes 54 provided at predetermined intervals on the outer periphery thereof. An air hole 54a connecting the inner circumference is provided.

The metering rotor 52 may be constituted by using a metal such as stainless steel or the like.
May be configured using the same material as the natural material n supplied to the substrate. When stainless steel is used, contamination to the natural material n and the masterbatch m can be avoided. When a material similar to the natural material n is used, a small piece of the measuring rotor 52 should be used for the masterbatch m. Even if mixed, there is no adverse effect on the resin molded product.

The rotating shaft 53 rotatably supporting the metering rotor 52 has a collector 51 so that the rotation thereof is not supported.
4 is provided with a suction pressure recess 53a corresponding to the portion where the rotor case 55 opens, and a discharge pressure recess 53b corresponding to the portion where the rotor case 55 opens in the material discharge pipe 58. Normally, the suction means, that is, the negative pressure air is supplied to the suction pressure recess 53a by the control means 56.
The discharge pressure recess 53b is supplied with discharge pressure, that is, positive pressure air.

The suction hole 54 is provided in the MB measuring and feeding device 5A.
Is formed in a hole having a shape corresponding to the master batch m to be counted, and at most, only one master batch m can be accommodated. For example, if the pellet shape of the masterbatch m is a column shape, the master batch m has a column shape, and it is desirable to apply a gentle chamfer to the opening edge.

As described above, since the suction holes 54 are formed in accordance with the shape of one grain of the master batch, long miscut master batches other than the standard size are not adsorbed in the suction holes 54 but remain at the end. Until then, only good masterbatch products can be selected and supplied, which is also excellent in that respect.

The valley bottom is provided with the above-described air hole 54.
The suction pressure is supplied when the suction hole 54 is at the position of the suction pressure recess 53a, and is discharged when the suction hole 54 is at the position of the discharge pressure recess 53b, corresponding to the rotation position of the metering rotor 52. Pressure is supplied. This air hole 54a is
When the master batch m is sucked into the suction holes 54, the master batch m is sealed by the sucked master batch m so that the suction pressure does not reach other surrounding master batches m.

The rotor case 55 covers the outer periphery and the side surface of the metering rotor 52, and has a portion covering the outer periphery.
An opening to the collector 51 and an opening to the material discharge pipe 58 are provided.

Outer circumference of metering rotor 52 and rotor case 5
The gap with the inner periphery of No. 5 is a gap that does not allow the master batch m to enter, that is, a dimension of about か ら to １ ／ of the minimum outer diameter dimension of the master batch m, and specifically, will be described here. In the example of master batch m, 0.1 mm to 1 mm
It has become about.

Therefore, the end 55a of the opening on the hopper side of the rotor case 55 in the direction in which the metering rotor 52 rotates is housed in the suction hole 54 and functions as a weir for removing excess master batch m other than the master batch m. You are. At this time, when the suction hole 54 of the present invention is at this position, suction pressure is supplied from the suction pressure concave portion 53a via the air hole 54a.
However, the other masterbatch m removed at the end portion 55a serving as the weir does not draw out by the electrostatic attraction force, and is reliably stored in the suction hole 54 in units of one grain. Passes through the end portion 55a, and heads toward the material discharge pipe 58.

The suction hole 54 is provided in the rotor case 55.
There is a case where the suction pressure is not supplied to the suction holes while the master batch m is in the portion covered by the inner periphery of the masterbatch. However, even in such a case, since the gap is small, the master batch m does not fall off.

The material discharge pipe 58 is provided with a counting detector 58 for confirmation.
a, it is possible to detect and count the master batch m in units of one particle discharged from the suction hole 54 into the material discharge pipe 58 one by one.

The confirmation counting detector 58a is for issuing a warning in the event that a suction leak or the like occurs in the suction hole 54 and for compensating for the shortage, but is not essential. .

The leading end of the material discharge pipe 58 is tapered, and the tapered introduction pipe 58b reaches the inside of the material supply port B of the resin molding machine A. Batch m can be supplied, and bias of master batch m can be most effectively avoided. Note that, even when described later, this introduction pipe has the above-described effects when it is attached, but it is not always necessary to provide the introduction pipe. When such an introduction pipe is provided, the mixing unit 7 described with reference to FIG. 1 is not necessary.

According to the MB metering / supplying apparatus 5A having such features, the master batch m stored in the collector 51 is surely adsorbed, separated, counted, and counted in a unit of a material discharge pipe. 58, and the addition ratio of the master batch m to be added to the natural material n can be accurately controlled by the minimum control unit.

Next, the air pressure distribution control means provided in the MB metering device and other details will be described with reference to FIG.

The measuring roller 52 is provided with a rotational force transmitting hole 52a for receiving a rotational driving force of a motor 52c for rotationally driving the measuring roller.
The rotation shaft 52b of the motor 52c is fitted in the motor 52c so that they do not rotate with each other, and the rotational driving force of the motor 52c is transmitted to the measuring roller 52 without any rotational deviation. The motor 52c controls the number of discharges of the master batch per unit time, that is, the discharge amount by controlling the number of rotations of the motor 52c.

As such a motor 52c, a stepping motor capable of detecting a rotation angle may be used, or a motor that cannot detect a rotation angle may be used when a separate rotation angle detecting means is provided.

Here, the measuring roller 52 is further provided with a counting plate 57a provided with a slit corresponding to the position of the suction hole 54 provided on the outer periphery of the measuring roller 52, and a counting plate for detecting this slit is provided. A proximity sensor 57b is provided, and the count signal is sent to the controller 57c. These counting plate 57a, counting proximity sensor 57
b, a controller 57c having a function of processing a count signal constitutes a master batch counting means 57. The controller 57c is connected to and controlled by the control panel 6. By this counting means 57, control on a grain-by-grain basis can be performed more reliably.

The rotary shaft 53 is further provided with a suction pressure recess 53.
a, seals 53e and 53f for sealing the outer circumference over the entire circumference on both sides of these recesses 53a and 53b in order to prevent the flow of air between the discharge pressure recess 53b and the outside; In order to prevent air from flowing between the pressurized recesses 53b, a seal 53g is provided which connects the seals 53e and 53f in the axial direction. Further, the suction pressure concave portion 53a of the rotating shaft 53, the discharge pressure concave portion 53b
, Air holes 53c and 53d led out toward the outer end face of the rotating shaft 53 are opened.

A suction pressure line 56a is connected to the air hole 53c. The suction pressure line 56a receives a supply of positive pressure air from a positive pressure line 56g to generate a negative pressure air. For example, an ejector is installed. A valve 56b for adjusting the flow rate of the negative pressure air is provided at an intermediate portion of the suction pressure pipeline 56a.

The positive pressure line 56g is supplied with positive pressure air from an air source 56h constituted by a compressor or the like via a suction control valve 56c.

A discharge pressure line 56d is connected to the air hole 53d, and positive pressure air from an air source 56h is directly supplied to the discharge pressure line 56d via a discharge control valve 56e. Further, a valve 56e for adjusting the flow rate of the positive pressure air is provided at an intermediate portion of the discharge pressure pipeline 56d.

A signal line from a controller 57c is connected to each of the suction control valve 56c and the discharge control valve 56e, so that the suction pressure or the discharge pressure is cut off as necessary. .

The suction pressure line 56a and the discharge pressure line 56
d, a bypass line 56i having an on-off valve 56j
During the color change cleaning, the suction control valve 56c to the suction pressure line 56a is closed, while the open / close valve 56j is opened, and the suction pressure line 56a is also connected to the positive pressure air from the discharge pressure line 56d. Is sent to assist the cleaning and collection of the remaining master batch m by the color changing cleaning means 4A.

The above described suction pressure recess 53a and discharge pressure recess 53
b, air holes 53c, 53d,..., suction control valve 56c, discharge control valve 56e,.
6f, various seals 53e, 53f, 53g, air source 5
6h, the bypass line 56i and the on-off valve 56j constitute the air pressure distribution control means 56.

In this way, the master batch m is normally suctioned and discharged by the air pressure distribution control means 56, and at the same time, at the time of color change cleaning, the suction side is also switched to the discharge side. Will be

Further, according to the MB metering / supplying apparatus 5A which measures and more precisely counts and supplies such a masterbatch one by one, the amount of the previous color is measured up to the amount absorbed by the metering rotor 52. After supply, the masterbatch is less left on the discharge side by changing colors, and cleaning can also be performed by positive pressure air for discharge.It is necessary to provide a separate cleaning nozzle on the discharge side. However, a cleaning nozzle or the like may be provided on the discharge side.

Further, in the MB metering / supplying apparatus 5A for counting and supplying such master batches one by one, the color change timing can be determined by each one of the minimum control units of the master batch. In addition, the time required for color change can be further reduced, and the present invention is excellent as the MB measuring and supplying device of the automatic master batch supplying device of the present invention.

[0078]

According to the master batch automatic supply device capable of changing colors in a short time according to the first aspect, when changing colors,
The MB metering and feeding device is installed on the resin molding machine to minimize the possibility that the masterbatch of the previous color may remain, and the transport piping used in the conventional example is eliminated. The number of parts to be cleaned is greatly reduced to only the MB metering device, and the cleaning is simplified. In addition, since the color change cleaning means for automatically cleaning the MB measuring and feeding device is provided, the remaining master batch can be cleaned automatically, so that the time for color change can be shortened, and labor for manual operation can be reduced. .

According to the automatic masterbatch supply apparatus capable of changing colors in a short time according to the second aspect, in addition to the effect of the automatic masterbatch supply apparatus according to the first aspect, an MB tank is separately provided. Therefore, more M than necessary on the resin molding machine
There is no need to install a B tank, so it can be easily added to an existing resin molding machine, and it is also possible to supply master batches of different colors to a plurality of resin molding machines from a separately placed MB tank in the same way. It is possible to save installation space as a whole.

[Brief description of the drawings]

FIG. 1 is a conceptual overall configuration diagram of an example of an automatic master batch supply apparatus capable of changing colors in a short time according to the present invention.

FIG. 2 is a conceptual main part configuration diagram showing in more detail an MB color selection unit and a color change cleaning unit of the automatic supply device of FIG. 1;
(A) is a top view of the MB color selecting means, and (b) is an MB color selecting means.
Longitudinal sectional view from the color selection means to the MB metering and supply device

FIG. 3A is a conceptual configuration diagram showing the overall configuration of another example of the MB metering device used in the automatic supply device of FIG. 1, and FIG.
Is a detailed sectional view of a main part of a measuring roller of the MB measuring and feeding device.

FIG. 4 is a detailed sectional view of a main part of the measuring roller of FIG. 3 (a) taken along a section perpendicular to FIG. 3 (a).

FIG. 5 is an overall configuration diagram conceptually showing a conventional masterbatch automatic supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 MB tank 2 MB transport pipe 3 MB color selection means 4 Color change cleaning means 4A Color change cleaning means 5 MB measurement supply device 5A MB measurement supply device 10 Automatic supply device A Resin molding machine B Material supply port C Screw D Material supply hopper m Masterbatch (MB) n Natural material (N material)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F201 AC08 AL03 AM10 AP14 BA06 BC02 BC12 BC15 BC19 BC37 BQ01 BQ07 BQ32 BQ49 BQ52 BQ54 BQ57

Claims (2)

[Claims] 1. An automatic supply device for supplying master batches of different colors to a material supply hopper of a resin molding machine, comprising: MB tanks for storing master batches of different colors, respectively; From the master batches of different colors supplied in the MB transport pipe, only the master batch of the desired color is selectively supplied to the next step.
A masterbatch comprising: a B color selecting means; an MB weighing / supplying device provided with the MB color selecting means and a color changing / cleaning means, and installed above the material supply hopper; At the time of color change, the master batch of the previous color remaining in the MB metering / feeding device is automatically cleaned by the color change cleaning means, and then a short-time color is supplied so that a new color master batch is supplied. Automatic feeder for replaceable masterbatch. 2. The MB according to claim 1, wherein the master batches of different colors are stored respectively.
An automatic master batch supply device capable of changing colors in a short time, wherein the tank is provided separately from the resin molding machine.