JPH0655569A - Horizontal injection molding machine - Google Patents

Abstract

PURPOSE:To efficiently produce various kinds of products respectively in a small quantity and to make it easy to perform the maintenance work at a purge position, by preparing an apparatus for a next injection while the machine carries out injection molding and performing the next injection molding with a different resin material continuously without a waste of time when the machine finishes the molding process. CONSTITUTION:Two injection devices 4A, 4B are set, horizontally on a horizontal rotary table with a 180 deg. shift. When the rotary table is turned by a rotary mechanism and a positioning mechanism 39A is driven, one injection device is stopped at an injection position, while the other device is stopped at a purge position. The rotary table is turned to move the devices alternately at the injection position for molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal injection molding machine for producing resin molded products and the like.

[0002]

2. Description of the Related Art In a horizontal injection molding machine comprising a mold clamping device for installing a mold and an injection device for injecting a resin material into the mold, one mold clamping device is paired with one. Although it is common to have an injection device, when it is necessary to produce a wide variety of resin molded products in small quantities, the process of exchanging the resin material in the heating cylinder of the injection device (the same material may be changed in color) That is, the ratio of time spent for the work of purging the resin material in the heating cylinder and supplying new resin material into the heating cylinder becomes large, which is inefficient. As an injection molding machine that solves this problem, two or more injection devices are provided slidably along a direction orthogonal to the machine longitudinal direction with the injection nozzle at the tip facing the mold clamping device. There is known a type in which one injection device is stopped at an injection position with respect to a mold and a resin material is injected into the mold by the injection device.

[0003]

In the injection molding machine of the type in which the above-mentioned two or more injection devices slide along the direction orthogonal to the machine longitudinal direction,
By supplying different types of resin materials (or materials of different colors) to each injection device, it is possible to continuously mold those resin molded products simply by sliding the injection device, and the injection The process of exchanging the resin material in the heating cylinder in the finished injection device has an advantage that it is efficient because another injection device can perform it during injection. However, since the injection nozzles of all the injection devices are suitable for the mold clamping device and the space between the injection devices cannot be made large, it is difficult to perform maintenance such as replacement of resin material or replacement or maintenance of the heating cylinder, In addition, the mechanism for sliding the injection device is complicated, and in order to make the entire device as small as possible, the injection device must be a unique one that matches the slide mechanism.
As a result, there is a problem that the cost is high.

[0004]

The horizontal injection molding machine of the present invention has been made to solve the above problems, and in claim 1, a mold clamping device and an injection device are substantially formed on a machine body. In a horizontal injection molding machine installed in a horizontal state, a rotary table that rotates about a vertical axis is installed on the machine body, and at least two injection devices are installed on the rotary table in the injection direction. Approximately 180 with respect to the rotary axis of the rotary table
And the rotary table is rotated, when one injection device is located at the injection position with respect to the mold clamping device, the other injection device is located at the purge position and the other injection device is located at the injection position. A rotation mechanism that moves each injection device so that one injection device is located at the purge position when the device is located at the injection position with respect to the mold clamping device, and positioning that stops each injection device at the injection position and the purge position, respectively. A second aspect of the present invention is the injection molding machine according to the first aspect, wherein the rotary table is rotated by the rotating mechanism, and one of the injection devices is placed at the injection position by the positioning mechanism and the other injection is performed. Alternately repeat the state of stopping the device at the purge position, and send an injection operation signal to the injection device that stops at the injection position. It is characterized in that it comprises a control device for feeding an automatic purge operation signal to the injection device to stop the purge position.

[0005]

According to the horizontal injection molding machine of the present invention, if different kinds of resin materials (materials of different colors) are supplied to the respective injection devices and injected alternately, the resin molded products can be continuously produced. Since the work of exchanging the resin material of one of the injection devices can be performed during the molding process of the other injection device, it is possible to obtain the resin molded product continuously and efficiently without wasting time. High-mix low-volume production is possible. Since the respective injection devices are arranged on the rotary table so as to change their directions by approximately 180 degrees and to be opposite to each other, the injection direction of the injection device in the purge position faces the direction opposite to the mold clamping device. Various operations such as the purging operation of the injection device located at the position and the replacement of the resin material due to the purging operation can be performed by effectively utilizing a large space without interfering with the injection device located at the injection position. In addition, it is easy to move each injection device from the injection position to the purge position by rotating the rotary table by the rotation mechanism, and the rotation mechanism can be easily configured, and each injection device is installed on the rotary table. It is possible to move to the injection position and the purge position by simply doing the above. In particular, it is not necessary to equip each injection device itself with a rotation mechanism or to use an existing one, so that the cost can be reduced The rise is suppressed.

Further, the injection molding machine is automatically controlled by the control device according to the second aspect of the present invention, so that while the molding operation is being performed at the injection position where it is stopped at the injection position, the manipulator is manually operated by the injection device which is stopped at the purge position. Since the preparation of the resin for the next production is completed automatically without any trouble, after the completion of molding, the rotary table is rotated by the rotating mechanism, so that it is possible to easily shift to the next molding, resulting in less wasteful time. Continuous production of small quantities of products can be easily achieved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a horizontal injection molding machine according to the present embodiment. The injection molding machine 1 includes a machine body 2 serving as a base.
And a mold clamping device 3 arranged on the left side of the machine body 2 in the drawing, and two injection devices arranged on the right side, that is, a first injection device 4A and a second injection device 4B. There is.

The mold clamping device 3 is housed in a guard 5, and a movable plate 8 is attached to a plurality of tie bars 7 extending between a fixed plate 6 and an end plate (not shown).
A mold clamping cylinder (not shown) movably provided along the movable plate 8 and the fixed plate 6 clamps the mold.

As shown in FIG. 3, each injection device 4A, 4B
Are of the same screw type, and the resin material is supplied from the hopper 11 into the heating cylinder 10, and the nozzle 13 of the heating cylinder 10 is fixed to the mold clamping device 3 by the slide cylinder 12.
The heating cylinder 1 by touching the gate of the mold installed in
By operating the screw inserted into the cylinder 0 with the injection cylinder 14, the resin material melted in the heating cylinder 10 is injected into the mold.

Each of these injection devices 4A and 4B is arranged horizontally on the machine body 2 and on a rotary table 16 which is configured to rotate about an axis by a rotating mechanism 15.
The injection directions are changed by 180 degrees, that is, they are arranged opposite to each other, and are arranged in a point-symmetrical position around the rotation center of the rotary table 16.

Rotating mechanism 15 of rotary table 16
As shown in FIG. 2, the support base 17 and the hydraulic motor 1
8, a hollow drive shaft 22 and the like. The support base 17 is fixed to the upper surface of the machine body 2 with bolts 20. The drive shaft 22 is supported in the center of the support base 17 via a pair of bearings 25, 25 arranged vertically with the collar 24 interposed therebetween, so that the drive shaft 22 can rotate about the axis with respect to the support base 17. . The rotary table 16 is the machine body 2
Is fitted to the projecting end of the drive shaft 22 projecting from the upper surface thereof and is fixed by a bolt 26. An upper piping block 28 is fixed to the upper surface of the center of the rotary table 16 with bolts 27. The oil passage outlet side provided in the upper piping block 28 is connected by piping to an actuator such as a hydraulic cylinder or hydraulic motor of each of the injection devices 4A and 4B.

A block support 1 is provided at the lower end of the hollow drive shaft 16 via a gear holder 31 described later.
9, a pair of lower piping blocks 21, 21 are supported on this block support 19, and the oil passage inlet side of these lower piping blocks 21, 21 is connected via a swivel joint or a hydraulic hose. The hydraulic source (not shown) and its outlet side are connected to the inlet side of the upper piping block 28 via hydraulic hoses 21, 21.

The lower end of the drive shaft 22 is coaxial with the drive shaft 22 and
A driven gear 29 is fitted so as to be rotatable integrally with 2. The driven gear 29 cannot be removed by an annular gear holder 31 fixed to the drive shaft 22 with a bolt 30. A drive pinion 32 rotated by the hydraulic motor 18 meshes with the driven gear 29.

The hydraulic motor 18 is fixed to a housing 34 fixed to the back surface of the support base 17 by bolts 33, and its output shaft is rotatably supported in the housing 34 through a pair of upper and lower bearings 36. The drive pinion 32 is connected to a drive shaft 35 that is integrally provided. Therefore, when the hydraulic motor 18 operates, the rotation of the drive pinion 32 is transmitted to the drive shaft 22, and together with the drive shaft 22, the rotary table 1 is rotated.
6 is designed to rotate. Rotary table 1
A table guide 37 fixed to the machine body 2 is provided on the outer periphery of the machine body 6.

Further, the rotary table 16 is fitted with first and second bushes 38A and 38B at symmetrical positions from the center line on a straight line passing through the center thereof, and the holes in these bushes 38A and 38B are formed into the first holes. And second pin holes 38a and 38b. These pin holes 38a
As the rotary table 16 rotates, the pin 39a of the positioning mechanism 39A described below is selectively inserted into the 38b, and in this state, either one of the two injection devices 4A and 4B is stopped at the injection position. Has become.

Now, as shown by the arrow in FIG. 3, the rotary table 16 is provided with each injection device 4A installed thereon.
Reciprocating half-rotation control of 4B is performed so as to stop at the injection position where the nozzle 13 faces the mold clamping device 3, and each injection device 4
The positioning mechanism 3 for positioning the injection positions of A and 4B
9A is the outer peripheral portion of the support base 17 and the support base 1
The distance from the center of 7 (the center of the rotary table 16) is equal to the distance from the center of the rotary table 16 of the pin holes 38a and 38b.
In this positioning mechanism 39A, a hydraulic cylinder 41 is mounted on a block 40 fixed to a support base 17 with its piston rod 42 facing upward, connected to the piston rod 42, and fitted into a support hole 39b of the block 40. The pin 39a is provided so as to be inserted into and removed from the holes 38a and 38b of the bushes 38A and 38B of the rotary table 16 by moving up and down by the operation of the hydraulic cylinder 41. Hole 38a / 3
When it is fitted in 8b, the rotary table 16 becomes non-rotatable, and at this time, either one of the injection devices 4A and 4B stops positioning at the injection position and the other at the purge position.

That is, as shown in FIG. 3, the rotary table 16 is stopped when the rotary table 16 is stopped as shown in FIG.
When the dog 43, which is rotated in the clockwise direction and is formed on the outer peripheral portion thereof, comes into contact with the first limit switch 44a installed on the machine body 2, a signal from the first limit switch 44a causes a rotation device 15 to rotate. Hydraulic motor 18 and the hydraulic cylinder 41 of the positioning mechanism 39A
The solenoid of the first electromagnetic switching valve G ₁ of the hydraulic circuit is demagnetized and switched to the neutral position, the hydraulic motor 18 is stopped, and the solenoid of the second electromagnetic switching valve G ₂ of the hydraulic circuit is energized. The piston rod 42 of the hydraulic cylinder 41 extends and the pin 3
9a is inserted into the first pin hole 38a, at which time the first injection device 4A is stopped at the injection position and the second injection device 4B is stopped at the purge position.

Further, when the rotary table 16 is rotated counterclockwise in FIG. 3 and the dog 43 comes into contact with the second limit switch 44b installed on the machine body 2, the rotary table 16 is moved from the second limit switch 44b. The signal causes the first electromagnetic switching valve G ₁ to switch to the neutral position by demagnetizing the other solenoid, stopping the hydraulic motor 18, and exciting the solenoid of the second electromagnetic switching valve G ₂ to the retracted position. The piston rod 42 of the hydraulic cylinder 41, which has been present, extends and the pin 39a becomes the second pin hole 38.
Then, the rotary table 16 is stopped at a position rotated by 180 degrees from the stop position. At this time, the second
The injection device 4B is positioned at the injection position, and the first injection device 4A is stopped at the purge position.

The injection molding machine 1 has a control device 45.
Thus, the rotation of the rotary table 16 and the injection operation of the resin material by the injection devices 4A and 4B are automatically controlled and operated. FIG. 4 shows a block diagram of the control device 45. In this block diagram, No. No. 1 is the first injection device 4A, No. 2 is a second injection device 4B.

That is, according to the control device 45, first, the production number setting devices SVC1 and SVC for setting the numbers actually produced by the first and second injection devices 4A and 4B.
The set value of VC2 and the first and second injection devices 4A-4
Count circuits PVC1 and PVC2 for counting the number of Bs produced
And the set values of the α ₁ setter and the α ₂ setter for setting the constant α ₁ for the production number of the first injection device 4A and the constant α ₂ for the production number of the second injection device 4B. Each is input to the comparison / determination circuit 46, and the comparison / setting circuit 46 is supplied.
In, the above values are compared according to a predetermined arithmetic expression.
From the comparison / determination circuit 46, each injection device 4 in the injection process
A production completion notice or production completion signal of A and 4B is sent to the sequence circuit 48 via the sequence selection circuit 47. ON / OFF signals of the limit switches 44a and 44b are input to the sequence circuit 48.

On the other hand, a signal from a temperature setter 49 for setting the temperature of the heating cylinder 10 of each of the injection devices 4A and 4B to the molding temperature and the heat retention temperature is connected to each of the injection devices 4A and 4B via the temperature setting selection circuit 50. The temperature controller 51 is sent to the heaters and thermocouples of the injection devices 4A and 4B. To the temperature setting selection circuit 50, the sequence circuit 48 sends a signal indicating whether each injection device is a molding process or a heat retention process, and the temperature controller 51 sends a signal from the sequence circuit 48.
A temperature rising completion signal is sent to the molding temperature. Then, from the sequence circuit 48, the first and second injection devices 4A,
4B, the rotation mechanism 15, and the positioning mechanism 39A,
Signals for production operation, purge operation, and rotation / stop of the rotary table 16 are sent.

The operation of the injection molding machine 1 is specifically controlled by the control device 45 as shown in the flowchart of FIG. 5 and the chart of FIG. Explaining from the state where the first injection device 4A is stopped at the injection position and is performing the production operation, the first injection device 4A is at the injection position, and the pin 39a of the positioning mechanism 39A is located on the first bush 38A. While the rotary table 16 is inserted into the pin hole 38a and the rotary table 16 is stopped, while the predetermined number is being injection-molded while counting the production number, the second injection device 4B is
After the nozzle 13 keeps the temperature of the heating cylinder 10 at the forward position, and subsequently the temperature is raised to the molding temperature,
The inside of the heating cylinder 10 is automatically purged.

The predetermined number of injections of the first injection device 4A and the second injection
When the automatic purging of the injection device 4B is completed, the nozzles 13 of the injection devices 4A and 4B are retracted, and then the piston rods 42 of the hydraulic cylinder 41 of the positioning mechanism 39A are retracted so that the pin 39a moves to the first position. After coming out of the bush 38A of No. 1, the hydraulic motor 18 rotates in the normal direction, and the rotary table 16 rotates counterclockwise in FIG. When the rotary table 16 rotates forward by 180 degrees, the dogs 43 come into contact with the limit switch 44b to operate, and the hydraulic motor 18 stops to rotate.
Also stop. Then, the piston rod 42 of the hydraulic cylinder 41 of the positioning mechanism 39A advances and the pin 39a is fitted into the pin hole 38b of the second bush 38B. As a result, the rotary table 16 cannot rotate and the second
The injection device 4B of the first injection device 4B to the injection position.
Positioning of A is stopped at the purge position.

The injection process by the second injection device 4B and the purging process for the first injection device 4A are performed in the same manner as described above, and when these are completed, the positioning mechanism 3
After the stop state of the rotary table 16 due to 9A is released, the rotary table 16 is rotated in the clockwise direction in FIG. 3, and the first injection device 4A is rotated as in the first stage.
To the injection position, the second injection device 4B returns to the purge position again, and similarly to the above, the injection by the first injection device 4A and the purge by the second injection device 4B are performed.

The above-described operation is repeated, and the injection molding machine 1
By using this injection molding machine 1, if different types of resin materials (materials of different colors) are supplied to the injection devices 4A and 4B and they are injected alternately,
Those resin molded products can be continuously obtained. The resin material in the heating cylinder 10 in one of the injection devices 4A (4B) that has finished the injection can be replaced by the other injection device 4B (4A) during the molding process, so that no time is wasted. It is possible to continuously and efficiently produce a wide variety of resin molded products in small quantities. Moreover, each injection device 4
Since the A and 4B are horizontally arranged side by side on the rotary table 16 and are arranged in opposite directions by changing their directions by 180 degrees, the injection devices 4A (4
The nozzle 13 in B) will face in the opposite direction to the mold clamping device 3 and therefore the injection device 4 in this purge position.
A (4B) purging operation, and accompanying replacement of resin material, and further maintenance work such as replacement, maintenance, and inspection of the heating cylinder 10 do not interfere with the injection device 4B (4A) at the injection position, and a large space is available. Can be used effectively.

Further, the injection devices 4A and 4B can be easily moved from the injection position to the purge position by rotating the rotary table 16 forward and backward in the horizontal plane by the rotating mechanism 15. Further, the rotating mechanism 15 has a simple structure, and the injection devices 4A and 4B can be moved to the injection position and the purge position only by installing them on the rotary table 16.
Since it is not necessary to equip the A / B 4 itself with a rotation mechanism or to use an existing one, it is possible to suppress an increase in cost.

Further, the injection molding machine 1 is automatically controlled by the control device 45 as described above, and it is possible to easily carry out efficient continuous production of a variety of products in a small amount without waste of manpower.

[0028]

As described above, according to the horizontal injection molding machine of the present invention, in the horizontal injection molding machine in which the mold clamping device and the injection device are installed in a substantially horizontal state on the machine body, A rotary table which rotates about a vertical axis is installed on the rotary table, and at least two injection devices are arranged on the rotary table so that their injection directions are opposite to each other by about 180 degrees with respect to the rotary axis of the rotary table. Installed and rotating the rotary table, when one injection device is located at the injection position for the mold clamping device, the other injection device is located at the purge position,
Further, when the other injection device is located at the injection position with respect to the mold clamping device, the rotation mechanism that moves each injection device so that the one injection device is located at the purge position, and each injection device is set at the injection position and the purge position. It is characterized by including a positioning mechanism for stopping at a position, and each injection device has a different type of resin material (or different color material).
Can be continuously obtained by supplying and alternately injecting them, and the resin material replacement work of one injection device after the injection is completed during the molding process of the other injection device. Therefore, it is possible to continuously and efficiently produce a wide variety of resin molded products in small quantities without wasting time. Since the respective injection devices are arranged on the rotary table so as to change their directions by approximately 180 degrees and to be opposite to each other, the injection direction of the injection device in the purge position faces the direction opposite to the mold clamping device. Various operations such as the purging operation of the injection device located at the position and the replacement of the resin material due to the purging operation can be performed by effectively utilizing a large space without interfering with the injection device located at the injection position. In addition, it is easy to move each injection device from the injection position to the purge position by rotating the rotary table by the rotation mechanism, and the rotation mechanism can be easily configured, and each injection device is installed on the rotary table. It is possible to move to the injection position and the purge position by simply doing the above. In particular, it is not necessary to equip each injection device itself with a rotation mechanism or to use an existing one, so that the cost can be reduced The rise is suppressed.
Also, by rotating the rotary table with the rotation mechanism,
Moreover, the state in which one injection device is stopped at the injection position and the other injection device is stopped at the purge position by the positioning mechanism is alternately repeated, and an injection operation signal is sent to the injection device stopped at the injection position, and the purge is performed. By providing a control device for sending an automatic purge operation signal to the injection device stopped at the position and performing the automatic control operation, efficient continuous production of a small amount of a wide variety of products with a small dead time can be easily achieved.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a side sectional view for explaining a rotation mechanism and a positioning mechanism.

FIG. 3 is a perspective view for explaining a rotary table, a rotation mechanism, a stop mechanism, and the like.

FIG. 4 is a block diagram of a control device.

FIG. 5 is a flowchart of automatic driving control by the control device.

FIG. 6 is a chart diagram comparing the operating states of the first and second injection devices with respect to time.

[Explanation of symbols]

 1 Injection Molding Machine 2 Machine Body 3 Mold Clamping Device 4A First Injection Device 4B Second Injection Device 15 Rotating Mechanism 16 Rotary Table 39A Positioning Mechanism 45 Control Device

Claims (2)

[Claims] 1. A horizontal injection molding machine in which a mold clamping device and an injection device are installed on a machine body in a substantially horizontal state,
A rotary table that rotates about a vertical axis is installed on the machine body, and at least two injection devices are installed on the rotary table so that their injection directions are opposite to each other by approximately 180 degrees with respect to the rotation axis of the rotary table. Installed and rotated the rotary table, when one injection device is located at the injection position with respect to the mold clamping device, the other injection device is located at the purge position,
Further, when the other injection device is located at the injection position with respect to the mold clamping device, the rotation mechanism that moves each injection device so that the one injection device is located at the purge position, and each injection device is set at the injection position and the purge position. A horizontal injection molding machine, comprising: a positioning mechanism for stopping at a position. 2. The injection molding machine according to claim 1, wherein the rotary table is rotated by a rotating mechanism, and one injection device is stopped by the positioning mechanism at the injection position and the other injection device is stopped by the purge position. A horizontal injection molding machine comprising a control device which is alternately repeated and sends an injection operation signal to an injection device stopped at an injection position and sends an automatic purge operation signal to an injection device stopped at a purge position.