JPH0735068B2 - Plastic molding machine with colorant or detergent supply - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine or a plastic molding machine such as an extrusion machine equipped with a colorant or detergent supply device.

[0002]

2. Description of the Related Art As a conventional mechanism for supplying a colorant in plastic molding, for example, JP-A-1-12730 is known.
An injection molding machine with a colorant supply device as shown in Japanese Patent No. 8 has been proposed. In this conventional apparatus, a plurality of colorant supply devices for press-fitting a liquid pigment and a cleaning agent supply device for pressurizing a cleaning liquid are provided, and a pigment or a cleaning agent of a desired color is supplied to the injection molding machine through the respective supply devices. It is supplied to the heating cylinder.

However, such a conventional device requires an independent supply device according to the number of colorants, that is, a colorant tank and a press-fitting pump thereof, a supply pipe and a dedicated injection bubble. .

In addition, since the cleaning agent must be injected into the heating cylinder when changing colors, a tank for the cleaning agent and its press-fitting pump, a supply pipe and an injection valve are required, and the equipment becomes large. This led to an increase in manufacturing costs.

In order to solve such a problem, a device as shown in FIG. 17 of the accompanying drawings has been proposed. In this device, a single injection valve 110 is provided in the heating cylinder 101 of the injection device 100, and a switching unit 120 that selectively switches the colorant supply units 111 and 112 and the cleaning agent supply unit 113 is provided outside the machine. The injection valve 1
10 and the switching unit 120 are connected via a press-fitting pump 121 (Japanese Patent Application No. 2-294168). Figure 1
In FIG. 7, reference numeral 102 is a screw, 103 is a resin material supply unit, 104 is a material hopper, and 105 is a feeder.

However, in the proposed device, the size and simplification of the device can be achieved as compared with the above-mentioned device, but this time, the colorant press-fitting pump 121, the supply pipe 122 and the injection valve 110 are used. There has been a problem that it is necessary to surely clean the route up to, and it takes time and labor for the cleaning.

Further, the fact that the colorant supply path is long has a problem that it is impossible or extremely difficult to pump the colorant with high viscosity.

[0008]

SUMMARY OF THE INVENTION In view of the above problems of the conventional apparatus, the present invention shortens the colorant supply route, and therefore facilitates easy cleaning at the time of color change and high viscosity coloring. The main purpose of the present invention is to make it possible to supply a colorant, and further to downsize and simplify this kind of colorant supply device.

[0009]

That is, the present invention is
An operating member having a discharge flow path communicating with the heating cylinder for mixing a colorant or a cleaning agent into a resin melting portion of a heating cylinder for melting resin of a molding machine, and reciprocating in the discharge flow path. An injection valve having a press-fitting pump provided with is provided, and a discharge channel of the injection valve is provided with a container storing a colorant or a cleaning agent and a press-in device for delivering the colorant or the cleaning agent from the storage container. The present invention relates to a plastic molding machine equipped with a coloring or cleaning agent supply device.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a vertical cross-sectional view of a colorant supply device showing an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged cross-sectional view of a main part showing the inhalation state of the colorant,
FIG. 4 is an enlarged cross-sectional view of a main part showing the discharge state of the colorant, FIG. 5 is a cross-sectional view of the same in the neutral state, FIG. 6 is a drive circuit diagram of the valve stem, and FIG. FIG. 8, FIG. 8 is a vertical cross-sectional view showing another example of the press-fitting pump, FIG. 9 is a cross-sectional view showing an inhalation state of the colorant, and FIG.
Is a cross-sectional view showing the discharge state of the colorant, and FIG. 11 is a cross-sectional view showing the neutral state.

FIG. 12 and subsequent figures show another embodiment of the present invention. FIG. 12 is a schematic sectional view showing an example in which the colorant supply device of the present invention is attached to an extruder, and FIG. FIG. 14 is a cross-sectional view showing a compressed state of a flexible bag-like object,
FIG. 15 is an overall sectional view of the press-fitting device, and FIG. 16 is a perspective view showing an example of a flexible bag-like object.

The embodiment shown in FIGS. 1 to 5 is an example in which the actuating member of the press-fitting pump and the valve rod of the injection valve are driven by separate mechanisms, and FIGS.
1 is an example in which the operating member of the press-fitting pump and the valve rod of the injection valve are driven by a single mechanism.

First, the embodiment shown in FIGS. 1 to 5 will be described. As shown in FIGS. 1 and 2, for example, a single injection valve 10 for supplying a coloring agent or a cleaning agent is provided in the resin melting portion of the heating cylinder C of the injection molding machine. The symbol S in FIG. 2 represents a screw.

A discharge flow path 12 is formed in a main body 11 of the injection valve 10, and a valve rod 14 for opening and closing a discharge port 13 at the tip of the discharge flow path 12 is inserted so as to be able to move forward and backward.

The body 11 of the injection valve 10
Is a storage container (press-fit) that contains colorant or cleaning agent.
A connecting portion 15 to which the cartridge 51 is detachably mounted is formed, and the connecting portion and the discharge flow path 12 of the injection valve are connected via the injection opening 16.

Further, the discharge flow path 12 of the injection valve 10
The operating member 2 reciprocates in the discharge channel 12 in order to pump the colorant or cleaning agent injected from the injection opening 16 into the discharge channel 12 through the discharge port 13 into the heating cylinder C.
A press-fitting pump 20 having 1 is provided.

Reference numeral 11A is a screw portion for attaching the injection valve 10 to the heating cylinder C, and 15A is a screw portion for attaching the storage container 51 to the valve body 11. The press-fitting pump 20 is
For example, a plunger type as shown in FIG.
It is continuously moved back and forth by a cam roller 27 attached to a rotary shaft 26 of a rotary drive unit such as the DC motor 25 shown in FIG. In FIG. 1, reference numeral 22 is a spring and 23 is a drain.

The valve rod 14 is driven by an air cylinder device 30 as shown. Reference numeral 31 in the drawing is a connecting rod, and 32 is an elongated hole portion for inserting the rotary shaft 26.

As the colorant or cleaning agent storage container 51, in this embodiment, a press-fit cartridge in which the colorant or cleaning agent is individually filled is used. In the press-fitting cartridge 51, the press-fitting device 53 is configured so that the pressing member 58 provided at the bottom of the press-fitting device 53 moves forward along the cartridge body. As shown in the drawing, the press-fitting device 53 injects compressed air from an air hole 56 provided in a holder 55 at the rear part of the cartridge to press the pressurizing member 58 at a constant pressure to wash the colorant or the cleaning inside the cartridge 51. It is designed to pump the agent.

Next, the operation of this device will be described with reference to FIGS. FIG. 3 is a diagram showing a step of inhaling a coloring agent (or a cleaning agent; the same applies hereinafter). As shown in this figure, the operating member 21 of the press-fitting pump 20 is retracted to open the injection opening 16 and the coloring agent A flows into the discharge passage 12 from the press-fitting device 53 . At this time, the valve rod 14 moves forward to close the discharge port 13.

Next, as shown in FIG. 4, the valve rod 14 is retracted, the operating member 21 of the press-fitting pump 20 is advanced, and the coloring agent A sucked in the above process is discharged from the discharge port 13 into the molten resin in the heating cylinder C. Discharge.

After the discharge is completed, the valve rod 14 advances to close the discharge port 13 as shown in FIG. 5, and the so-called neutral state is established. After this, the process again returns to the suction process of FIG. 3, and suction and discharge are repeated.

In the above embodiment, the actuating member 21 of the press-fitting pump 20 is driven by the DC motor 25 shown in FIG. 2, and one valve rod 14 is actuated by the air cylinder device 30. The control is performed in the interlocking relationship as shown in FIGS.

In this example, in which the valve rod 14 and the operating member 21 of the press-fitting pump 20 are driven by separate and independent mechanisms, for example, when cleaning the injection valve 10, only the valve rod 14 is violently and continuously moved. By performing the so-called chattering operation, it is possible to enhance the cleaning efficiency of the valve. 6 is a drive circuit diagram of the air cylinder device 30 that drives the valve rod 14, and FIG.
FIG. 6 is a circuit diagram for chattering in which the object is violently and continuously moved.

The embodiment shown in FIG. 8 and subsequent figures shows an example in which the operating member and the valve rod of the press-fitting pump are operated by a single drive mechanism.

In the embodiment shown in FIG. 8, the operating member 21 of the press-fitting pump 20 and the valve rod 14 are operated by a single rotary drive mechanism 40. This rotary drive mechanism 40 is DC
A crank member 44 is attached to a drive shaft 42 of a drive motor such as the motor 41 via an eccentric shaft 43. The crank shaft 44 is connected to the crank member 44, and a cam roller 45 for reciprocating the press-fitting pump 20 is attached. To be

Then, by the rotation of the DC motor 41,
A series of continuous movements as shown in FIGS. 9 to 11 are applied to the operating member 21 and the valve stem 14 of the press-fit pump 20. Note that, in FIG. 8, the same reference numerals as those in the previous embodiment shown in FIG. 1 represent the same members.

That is, FIG. 9 is a view showing the step of inhaling the colorant corresponding to FIG. 3 described above. The operating member 21 of the press-fitting pump 20 is retracted to open the injection opening 16, and the pressurizing device 53 causes the colorant A to flow. Is in a state of flowing into the discharge flow path 12.

FIG. 10 corresponds to FIG. 4 described above, in a state in which the operating member 21 of the press-fitting pump 20 advances to discharge the coloring agent A sucked in the above process from the discharge port 13 into the molten resin in the heating cylinder C. is there.

Further, FIG. 11 corresponds to FIG. 5 and shows a so-called neutral state in which the valve rod 14 advances to close the discharge port 13 after the completion of discharge. In this example, since the actuating member of the press-fitting pump and the valve rod are actuated by a single drive mechanism, there is an advantage that the mechanism is compact.

12 and 13 show an example in which the extruder E is provided with the coloring material supply device of the plastic molding machine of the present invention. Reference numeral C1 is a heating cylinder, S1 is a screw, H is a raw material hopper, and P is a resin material.

A discharge flow passage 62 is formed in the main body 61 of the injection valve 60 provided in the resin melting portion of the extruder E, and the discharge outlet 63 at the tip of the discharge flow passage 62 is open to the heating cylinder C1. , The connecting portion 65 is formed, and the connecting member 8 is formed.
Storage of colorants and cleaning agents as shown in FIG.
A retaining container (flexible bag-like object) 91 is detachably attached. In FIG. 13, reference numeral 64 is a valve rod, 66 is an injection opening, and 70 is a heating cylinder C for applying the coloring agent or the cleaning agent from the storage container 91.
1, a plunger, 72, a spring, 77, a rotating shaft, and S, an air cylinder device for driving the valve rod 64.

The connecting member 80 includes a connector portion 81 screwed to the connecting portion 65, a nut portion 82, a bush 83,
The high pressure hose 85 is connected to the bush 84 and is connected to the joint portion 86 of the storage container 91 shown in FIG. Reference numeral 87 is the joint portion 86
, 88 is a bush.

In this embodiment, the storage container 91 is made of a flexible bag-like member mounted in the casing 95.
This flexible bag 91 is made of a synthetic resin sheet such as PET or vinyl chloride in which a coloring agent or a cleaning agent is enclosed, and has a nozzle 92 to which the joint portion 86 is connected in the front portion thereof. ing.

This flexible bag 91 is pressed and compressed by the press-fitting device 93 as shown in the figure. Press-fitting device 93
As shown in FIG. 15, an air cylinder device 96 including a pressurizing member 98 for pressing the rear portion of the flexible bag-like object 91 in which a coloring agent or a cleaning agent is enclosed is provided. It is provided on a base 94 of a casing 95 in which the object 91 is installed. The press-fitting device 90 is detachably attached to the base 94.

The flexible bag-like material 91 housed in the casing 95 is a piston rod 97 of the air cylinder device 96.
And the rear portion is pressed by the pressure member 98 at a constant pressure, and the colorant or the cleaning agent enclosed therein is pressure-fed by a constant amount. The piston rod 97 and the pressing member 98 are detachably coupled to each other via a split collar 99 with a bolt 99A or the like.

FIG. 16 shows an example of the flexible bag 91. Reference numeral 92 is a nozzle. By using such a flexible bag-like material 91, it is possible to prevent a coloring agent or the like from adhering to the inside of the casing 95, and efficiently perform a color changing operation of the coloring agent or the like that easily adheres to the apparatus body such as a liquid color. Can be converted. Moreover, by packing the colorant in a bag, the transportation method can be greatly simplified.

[0038]

As shown and explained above, according to the present invention, the heating cylinder for melting the resin of the molding machine communicates with the inside of the heating cylinder for mixing the coloring agent or the cleaning agent into the resin melting portion. A container having a discharge channel and an injection valve having a press-fitting pump having an operating member that reciprocates in the discharge channel, and a container storing a coloring agent or a cleaning agent in the discharge channel of the injection valve. Since the press-fitting device for delivering the coloring agent or the cleaning agent from the storage container is provided, a long pipe for supplying the coloring agent, which has been required in the related art, is not required at all, and the supply path is greatly shortened.

The shortening of the colorant supply path means that the portion to be washed at the time of color change is reduced, and the washing can be easily and easily performed. Actually, when the conventional supply pipe is provided, the remaining amount of the colorant staying in the path at the time of color change is about 10 cc, but according to the device of the present invention, it becomes 0.5 cc or less, and the work required for color change Now you can save a lot of time.

At the same time, according to the apparatus of the present invention, since the colorant supply path is shortened and the injection valve is provided with the press-fitting pump, the high-viscosity colorant can be supplied. That is, the viscosity of the colorant in the conventional apparatus was about 100 poise, but the high-viscosity colorant of 1000 poise can be injected under pressure.

Further, according to this apparatus, it is possible to easily and easily carry out color change and cleaning by exchanging the press-fitting cartridge or the flexible bag-like material in which the colorant or the cleaning agent is enclosed. It has become possible to significantly improve the work efficiency of. In addition, the device of the present invention has a great practical and practical advantage such as the size and simplification of the colorant supply device of this kind, as is apparent from the drawing.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a colorant supply device showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view in which the cut surface is changed.

FIG. 3 is an enlarged cross-sectional view of a main part showing the inhalation state of the colorant.

FIG. 4 is an enlarged cross-sectional view of the main part showing the discharge state of the colorant.

FIG. 5 is a sectional view of the same in a neutral state.

FIG. 6 is a valve rod drive circuit diagram.

FIG. 7 is a circuit diagram in a case where the valve rod is vigorously and continuously moved.

FIG. 8 is a vertical cross-sectional view showing another example of the press-fitting pump.

FIG. 9 is a sectional view showing an inhalation state of the colorant.

FIG. 10 is a cross-sectional view showing a discharged state of the colorant.

FIG. 11 is a sectional view of the same in a neutral state.

FIG. 12 is a schematic sectional view showing an example in which the colorant supply device of the present invention is attached to an extruder.

FIG. 13 is a cross-sectional view of the relevant part.

FIG. 14 is a cross-sectional view showing a compressed state of a flexible bag-like material.

FIG. 15 is an overall sectional view of a press-fitting device.

FIG. 16 is a perspective view showing an example of a flexible bag.

FIG. 17 is a cross-sectional view showing an example of a colorant supply device proposed in advance of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 injection valve 12 discharge flow path 13 discharge port 14 valve rod 15 connection part 16 injection opening 20 press-fitting pump 21 operating member 25 DC motor 26 rotary shaft 27 cam roller 40 rotary drive material mechanism 41 DC motor 42 drive shaft 43 eccentric shaft 44 crank member 45 cam roller 51 storage container (press-fitting cartridge) 53 press-fitting device 58 pressurizing member 91 storage container (flexible bag-like object) 98 pressurizing member

Claims (5)

[Claims] 1. A discharge channel communicating with the heating cylinder for mixing a coloring agent or a cleaning agent into a resin melting portion of a heating cylinder for melting resin of a molding machine, and the inside of the discharge channel. An injection valve having a press-fitting pump having a reciprocating actuating member is provided, and a container storing a colorant or a cleaning agent in a discharge flow path of the injection valve and a press-in device for delivering the colorant or the cleaning agent from the storage container. A plastic molding machine equipped with a coloring agent or cleaning agent supply device. 2. The plastic molding machine according to claim 1, wherein the molding machine is an injection molding machine or an extruder and is provided with a coloring agent or cleaning agent supply device. 3. The plastic molding machine according to claim 1, wherein the storage container is a press-fitting cartridge, and the press-fitting device includes a pressurizing member provided at a rear portion of the press-fitting cartridge. 4. The colorant according to claim 1, wherein the storage container is made of a flexible bag-like object mounted in a casing, and the press-fitting device includes a pressing member for compressing the flexible bag-like object. A plastic molding machine equipped with a cleaning agent supply device. 5. The injection pump according to claim 1, which penetrates the central portion of the operating member of the infusion pump in a pressure-tight manner, operates independently of the drive source of the operating member, and causes the discharge port of the discharge flow path of the injection valve to reach the forward limit. A plastic molding machine equipped with a coloring agent or cleaning agent supply device provided with a valve rod capable of reciprocating so as to open the discharge port when closing and retreating.