JPH0746501Y2 - Double injection molding machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an injection molding machine equipped with a double mold clamping device.

[0002]

2. Description of the Related Art Conventionally, an injection molding machine has a large or small injection molding machine arranged as a group according to the size of a product produced by the injection molding machine, or a large or small injection molding machine is arranged in the order of the production process. .

[0003]

However, if the injection molding machines are arranged according to the size or process of the molded products to be produced, and if the type (size) of the products is changed, the injection molding machine will be An injection molding machine equipped with a mold clamping device with the largest mold is selected. In this way, selecting an injection molding machine based on a large product results in poor efficiency when molding a small product on a large machine, and when the production volume is small, the operating rate of the machine is reduced and productivity is hampered. There was a problem such as being

Therefore, an object of the present invention is to arrange at least two injection molding machines in parallel and to configure the mold clamping devices of these injection molding machines so as to interlock with each other by mechanical coupling or electrical control. It is an object of the present invention to provide a double injection molding machine capable of improving the machine operation rate by selectively using the mold clamping device according to the size of the mold.

[0005]

In order to achieve the above object, in the present invention, at least two injection molding machines are arranged in parallel, and the mold clamping device of the injection molding machines is selected according to the size of the mold used. It is characterized in that it is configured to operate in conjunction with each other.

In this case, the interlocking means is provided with a position detector on each of the two mold clamping devices, calculates the speeds of the movable die plates of these mold clamping devices at predetermined open / close positions, and calculates the die plates. It is preferable that both mold clamping devices are configured to be feedback-controlled so that the positions of and are the same.

Further, the interlocking means may be mechanically coupled and interlocked with each other by a die provided between the two mold clamping devices.

Further, the interlocking operation means may be coupled by a mechanical coupling means provided so as to be engageable with and disengageable from the two mold clamping devices.

[0009]

In the dual injection molding machine according to the present invention, at least two injection molding machines are arranged in parallel so that the mold clamping devices of these injection molding machines are interlocked by mechanical coupling or electrical control. As a result, the mutual mold clamping devices can be selectively used depending on the size of the mold, the machine operating rate can be improved, and the productivity can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dual injection molding machine according to the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 shows a first embodiment of a dual injection molding machine according to the present invention, and a control block diagram for interlocking the mold clamping devices of two injection molding machines arranged in parallel, FIG. 2 (a). Is a mold closing operation diagram, and FIG. 2B is a mold opening operation diagram. Figure 1
Indicates one of the two injection molding machines arranged in parallel. In the figure, reference numeral 12 is a mold clamping cylinder that constitutes a mold clamping device of the injection molding machine 10, and reference numeral 14 is supplied by a hydraulic pump 26. This is a mold clamping ram that moves pressure oil forward and backward by switching the direction switching valve.

A movable die plate 16 is fixed to the tip of the mold clamping ram 14 integrally with the mold clamping ram 14.
A movable die 18 is attached on the 16 and a fixed die 20 is attached on the fixed die plate 22 so as to face the movable die 18.

Reference numeral 24 indicates a pulse scale fixed to the side surface of the movable die plate 16, and this pulse scale is shown.
A detection head 30 is fixed to the side surface of the mold clamping cylinder 12 so as to face 24, and a pulse signal is generated for each unit movement amount of the moving die plate 16. Reference numerals 32 and 34 indicate a forward speed change position and a backward speed change position setting unit provided with a register group, and in this embodiment, three positions are set respectively. The settings in the registers of the position setting units 32 and 34 can be arbitrarily set with thumbwheel switches, daisy switches, etc., and once set, the contents can be modified or changed according to external conditions. Is also possible.

Reference numeral 36 indicates a comparator, and the detection head 30
The control unit 38 is provided with a coincidence signal obtained by comparing the position signal of the moving die plate 16 detected by the above-mentioned position signal with the position signals from the respective position setting units 32 and 34 set in advance.

Further, reference numerals 40 and 42 are speed setting sections, and the forward and backward speeds of the moving die plate 16 can be set in this setting section, and high speed and low speed can be set for each speed. Has become. The speed feedback signal output from the detection head 30 is D / A.
It is converted into an analog amount through the converter 44, and this is compared with the values set in the speed setting units 40 and 42 by the comparator 46, and the coincidence signal is given to the control unit 38. Further, reference numerals 48 and 50 are pressure setting units for setting low pressure and high pressure, respectively, and the pressure set values set in these pressure setting units 48, 50 are given to the control unit 38, respectively.

In this way, the respective coincidence signals given to the control unit 38 are internally processed, and the control unit 38
The signals output from each are pressure valves (relief valves) 5
2, provided to the flow valve (electromagnetic proportional flow control valve) 54 and the direction control valve 28. The above-mentioned feedback signal is simultaneously output to another injection molding machine (not shown) arranged in parallel with the injection molding machine 10 (arrow in the figure) and is similarly processed.

Therefore, in the mold closing operation of the mold 18 by the moving die plate 16 in the diagram shown in FIG. 2 (a), the flow rate valve 54 speeds up to the position x switched by the direction control valve 28 by the start of mold closing. After moving to the y position at a constant speed, the pressure valve 52 and the flow valve are moved from this position y.
When the low pressure and low speed are controlled by 54 and the z position is reached, the mold closing operation is completed, and the directional control valve 28 is switched to change the pressure valve.
52 is controlled to increase the mold clamping pressure.

Further, as shown in FIG. 2B, in the mold opening operation of the mold 18 by the moving die plate 16, the mold opening operation is started with the mold clamping pressure reduced by the pressure valve 52,
Flow valve 54 up to position x switched by directional control valve 28
After being moved at a constant speed to the y position, the pressure valve 52 and the flow valve 54 control the speed at high speed and low speed from this position, and when the z position is reached, the mold opening operation is completed.

Next, a second embodiment in which the interlocking means is a mechanical means will be described with reference to FIGS. That is, FIG. 3 is a plan view in which two injection molding machines are arranged in parallel, and FIG. 4 is a sectional view taken along line AA of FIG. In the figure, reference numeral 64 is a conveying path for conveying the mold, and when using a large mold that straddles the moving die plates 16a, 16b of two adjacent injection molding machines 10a, 10b. Is to mechanically connect the two mold clamping devices by mounting the large dies transferred on the transfer path 64 and loaded into the opposite moving die plates 16a, 16b and fixed die plates 22a, 22b. However, they can be interlocked with each other.

Further, a third embodiment in which mechanical means for interlocking movement is provided separately from the mold will be described with reference to FIGS. In the figure, of the two injection molding machines arranged in parallel, one end of a locking arm 56 is pivotally supported on a hinge 58 provided on the moving die plate 16b of one injection molding machine 10b.
The trunnion type cylinder 62 provided on the side surface of the movable die plate 16 is rotatably supported, and the locking arm 56 extends over the movable die plates 16a and 16b of two adjacent injection molding machines 10a and 10b. Have

Further, on the two movable die plates 16a, 16b, a plurality of engaging portions 60 having a recessed groove 60a capable of engaging with the engaging arm 56 are provided in series on the upper part thereof. 56
Is engaged with the recessed groove 60a by the turning operation by the operation of the cylinder 62 (see FIG. 5). Therefore, two moving die plates
When using a mold that does not straddle 16a, 16b, lock arm 5
By rotating 6 to engage it with the engaging portions 60 of the two mold clamping devices, the moving die plate 16 of these mold clamping devices is moved.
The a and 16b can be interlocked with each other.

As described above, by selectively operating the mold clamping device in accordance with the size of the mold used,
The operating rate of the machine can be improved.

[0022]

As is apparent from the above-described embodiments, in the dual injection molding machine according to the present invention, at least two injection molding machines are arranged in parallel and the mold clamping devices of these injection molding machines are mechanically arranged. By configuring them to work together by coupling or electrical control, it is possible to selectively use the mutual mold clamping devices depending on the size of the mold, which contributes to improving the machine operating rate and improving productivity. it can.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the embodiments of the present invention, and it is needless to say that various design changes can be made without departing from the spirit of the present invention. is there.

[Brief description of drawings]

FIG. 1 is a control block diagram for interlocking operation of mold clamping devices of two injection molding machines arranged in parallel according to the present invention.

FIG. 2 is a mold closing and mold opening operation diagram.

FIG. 3 is a plan view in which two injection molding machines are arranged in parallel.

4 is a cross-sectional view taken along the line AA of FIG.

5 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 10 …… Injection molding machine 12 …… Mold clamping cylinder 14 …… Mold clamping ram 16 …… Moving die plate 18 …… Moving die 20 …… Fixed die 22 …… Fixed die plate 24 …… Pulse scale 26 …… Hydraulic pump 28 ...... Direction switching valve 30 ...... Detection head 32 ...... Forward side speed switching position setting unit 34 ...... Reverse side speed switching position setting unit 36 …… Comparator 38 …… Control unit 40 …… Speed setting unit 42 ...... Speed setting part 46 …… Comparison 52 …… Pressure valve 54 …… Flow valve 56 …… Locking arm 60 …… Engagement part

Claims (4)

[Scope of utility model registration request] 1. A double injection system characterized in that at least two injection molding machines are arranged in parallel, and a mold clamping device of the injection molding machines is configured to selectively interlock with each other depending on the size of a mold used. Molding machine. 2. The interlocking means is provided with a position detector on each of the two mold clamping devices, calculates the speeds of the movable die plates of these mold clamping devices at predetermined opening / closing positions, and calculates the speed of each die plate. The dual injection molding machine according to claim 1, wherein both mold clamping devices are configured to be feedback-controlled so that the position and the speed thereof are the same. 3. The double-acting system according to claim 1, wherein the interlocking means is mechanically coupled by a mold provided between the two mold clamping devices and interlocked with each other. Injection molding machine. 4. The double injection molding machine according to claim 1, wherein the means for interlocking movement is connected to the two mold clamping devices by a mechanical connecting means provided so as to be engageable and disengageable.