JP3202444U - Shaft type turntable positioning device for injection molding machines - Google Patents

Abstract

A shaft type turntable localization device for an injection molding machine is provided. A shaft type turntable localization device of an injection molding machine is provided with a first encoder 141 and a second encoder 152 on a servo motor 14 and a speed reducer 15 of the localization device 1, respectively. Thus, after the injection molding machine completes the injection operation, the drive shaft 142 is driven using the servo motor 14 and the output shaft 151 is interlocked. As a result, the main driving wheel 153 interlocks with the rotation of the shaft 11, and at the same time, the turntable 12 rotates and is positioned. In addition, during the rotation, the position is adjusted by the sensing signals of the first encoder 141 and the second encoder 152, and the turntable 12 is controlled and rotated to an accurate position. [Selection] Figure 3

Description

  The present invention relates to a localization apparatus, and more particularly to a shaft-type turntable localization apparatus for an injection molding machine that can control the rotational localization of a shaft-type turntable for an injection molding machine to an accurate position.

Two-color injection molding is a method of manufacturing a product having an appearance of two colors or two materials by injecting plastics of two colors or materials.
When the two-color injection molding machine is operated, a male mold and a female mold are installed on a template that can be rotated 180 degrees back and forth.
After combining the male and female molds, the first plastic injection is performed, then the mold is opened, the template is rotated 180 degrees, and the position of the male mold is changed.
Furthermore, the male mold and the female mold are combined again, the second plastic injection is performed, the mold is opened, the mold is removed, and the injection product is completed.

Conventional template rotation methods can be divided into a shaft type, a turntable type, or a method of integrating the two into an injection molding machine.
In the shaft type, the rotation of the gear fitted to the shaft is interlocked using the belt through the reduction gear output shaft, thereby causing the mold fixed on the shaft to rotate.
Furthermore, the effect of turntable localization is achieved by the encoder installed in the motor.
However, although this method can achieve the purpose of localization, there is a problem that the reduction gear unit in the reduction gear causes a backlash problem during transmission and the localization becomes inaccurate.

The “mold turntable stereotaxic structure of an injection molding machine” disclosed in Patent Document 1 has two hydraulic buffers fixed above and below the center of the front wall of the moving platen by a horizontal platform unit and turned by a collision plate unit. It is fixed above the center of the outer wall of the table, so that the left side wall of the collision plate presses the working end of the upper hydraulic buffer.
As a result, the turntable is driven by the hydraulic motor and power shaft of the upper gear base of the moving platen, and the main driving gear, the passive gear and the turntable gear rotate in turn, and when the turntable rotates, the collision plate Synchronizes with the turntable.
In addition, when the rotating collision plate right wall presses the working end of the lower hydraulic buffer, the rotating turntable can extinguish high-speed impact force by the hydraulic buffer.
As a result, the orientation is stopped instantaneously and the mold rotation circulation time can be shortened.

The “two-color injection molding machine having a shaft and turntable function” disclosed in Patent Document 2 has a turntable and a shaft installed on a main body.
Tank holes will be installed in the turntable.
A shaft casing is assembled on the main body, whereby the shaft casing is correspondingly drilled in the turntable tank hole.
Furthermore, the 1st bearing corresponding to a shaft casing is assembled | attached in a tank hole, and it drives with a servomotor.
As a result, when the shaft rotates, the mold interlocks the main driving wheel by starting the servo motor, interlocks with the transmission belt, and interlocks the passive wheel of the shaft casing with the transmission belt.
Thereby, a shaft casing and a shaft are rotated simultaneously, and the localization effect is achieved.

Patent Document 3 discloses an “injection molding machine turntable control device” in which a servo motor is connected to a turntable mechanism, position data of the turntable mechanism is output by a location recorder, and a servo drive is transmitted by the location recorder. After receiving the data, power is supplied and the servo motor is driven.
The servo drive knows the current position of the turntable mechanism based on the position data output from the location recorder, drives the servomotor, accurately controls the turntable mechanism and rotates it to the target position.

Taiwan Patent No. 498840 Specification Taiwan Patent No. M497087 Specification Taiwan Patent No. M476047 Specification

  The shaft rotation template method according to the prior art interlocks the rotational position of the shaft through a speed reducer with a servo motor, but the speed reduction gear of the speed reducer has a drawback that the position is inaccurate due to a backlash problem.

  The present invention adds an encoder in the shaft type turntable positioning device, reduces the gear gap error value by at least two encoders, and achieves the effect of precise control positioning. Relates to the device.

In the shaft type turntable localization apparatus of the injection molding machine according to the present invention, the localization apparatus is attached to a movable molding station.
A shaft casing having a passive wheel is installed in the movable molding station, and the localization apparatus has a shaft, a moving drive mechanism, a servo motor, a speed reducer, and a central control unit.
The shaft is installed in the shaft casing, and a turntable is attached to one end of the shaft.
The moving drive mechanism attaches the turntable of the shaft to one end where it is not installed, and moves the shaft in a horizontal direction in conjunction with the shaft.
The servo motor has a first encoder and a drive shaft, and the servo motor drives rotation of the drive shaft based on the received signal.
The first encoder senses a motor rotation signal.
The speed reducer has a speed reduction gear unit that is attached to the servo motor and can be interlocked with the drive shaft.
The reduction gear unit has an output shaft, and a second encoder and a main driving wheel are installed on the output shaft.
The central control unit transmits a signal to the servo motor based on a set numerical value, and receives sensing signals of the first encoder and the second encoder.
The transmission belt is installed by being fitted to the main driving wheel and the passive wheel.

As described above, the shaft type turntable localization device of the present invention controls the forward or backward movement of the turntable attached to the shaft by the movement drive mechanism, and performs the work of matching or opening the male type and the female type.
After completing the injection operation, the servomotor is used to drive the output shaft of the speed reducer, the main drive wheel is rotated, the shaft is interlocked by the transmission belt, and the turntable is rotated and positioned at the same time.
Moreover, during rotation, the speed and position are adjusted and fed back by sensing the signal with the first encoder installed in the servo motor and the second encoder installed in the speed reducer, and the servo motor accurately positions the turntable. The effect of quick localization can be achieved.

It is a block chart of this invention injection molding machine. It is a front view of this invention injection molding machine. It is a schematic diagram of the shaft advance by this invention injection molding machine. It is a schematic diagram of shaft retreat by the present invention injection molding machine.

(One embodiment)
As shown in FIGS. 1 to 3, the injection molding machine shaft turntable localization apparatus 1 of the present invention is attached to a movable molding station 2.
A shaft casing 3 is installed in the movable molding station 2.

A passive wheel 31 is formed on the shaft casing 3.
The localization apparatus 1 includes a shaft 11, a movement drive mechanism 13, a servo motor 14, a speed reducer 15, a central control unit 10, and a transmission belt 16.

The shaft 11 is installed in the shaft casing 3, and a turntable 12 is attached to one end of the shaft 11.
The movement drive mechanism 13 attaches the turntable 12 of the shaft 11 to one end where it is not installed, and moves the shaft 11 to move in the horizontal direction.
The servo motor 14 is provided with a first encoder 141 and a drive shaft 142, and the servo motor 14 drives the rotation of the drive shaft 142 based on the received signal.
The first encoder 141 senses a rotation signal of the drive shaft 142.
The reduction gear 15 includes a reduction gear unit 150 that is attached to the servo motor 14 and can be interlocked by a drive shaft 142.
The reduction gear unit 150 has an output shaft 151, and a second encoder 152 and a main driving wheel 153 are installed on the output shaft 151.
The central control unit 10 transmits a signal to the servo motor 14 based on the set numerical value, and receives a sensing signal fed back by the first encoder 141 and the second encoder 152.
The transmission belt 16 is installed by being fitted between the main driving wheel 153 and the passive wheel 31 of the shaft casing 3.

As shown in FIGS. 1 and 3, when a shaft type turntable is adopted in the injection molding machine, the male type is attached to the turntable 12.
Thereby, the movement drive mechanism 13 operates and pushes and moves the turntable 12 until the male type fits into the female type (see the arrow direction in the figure).
After the male type and the female type are combined, the primary injection work can be performed.

After completion of the injection, as shown in FIG. 4, the movement drive mechanism 13 operates again and pulls the turntable 12 back to the original position.
Thereby, the male type separates from the female type.
Next, after receiving the set speed and position (frequency), the central control unit 10 converts the pulse signal generated by the speed and position feedback into a position signal, generates an appropriate voltage command, and drives the drive shaft 142 of the servo motor 14. Rotate.
The servo motor 14 senses a rotation signal of the servo motor 14 through the first encoder 141 simultaneously with driving.
Thereby, the central control unit 10 adjusts the rotation speed of the servo motor 14 after receiving the signal of the first encoder 141, and the drive shaft 142 interlocks with the rotation of the output shaft 151 of the reduction gear unit 150 of the reduction gear 15. Simultaneously with the rotation, the rotation signal of the output shaft 151 is sensed through the second encoder 152.

When the central control unit 10 receives the signal of the second encoder 152 and the set position signal, when the reduction gear unit 150 causes an error due to backlash, the central control unit 10 readjusts the command given to the servo motor 14.
Thereby, the drive shaft 142 rotates and interlocks with the rotation of the output shaft 151 of the speed reducer 15.
When the central control unit 10 receives a position signal that matches the setting of the second encoder 152, the output shaft 151 interlocks with the rotation of the main driving wheel 153, and at the same time as the main driving wheel 153 rotates, the shaft 11 is interlocked through the transmission belt 16. To do.
Thereby, the turntable 12 fixed to the shaft 11 rotates to the set position.
Next, after moving the shaft 11 back again, the movement drive mechanism 13 combines the male type and the female type again, and performs the secondary injection operation.

By installing the first encoder 141 and the second encoder 152 in the servo motor 14 and the speed reducer 15, respectively, when the servo motor 14 drives the drive shaft 142 and the speed reducer 15, the first encoder 141 and the second encoder 152 A signal transmitted to the central control unit 10 confirms whether there is an error.
Further, after adjusting the error, a command is issued to the servo motor 14 to control the rotation of the drive shaft 142, the speed reducer 15 and the main driving wheel 153, and the shaft 11 is accurately localized.

  The above-described embodiments of the present invention do not limit the present invention. Therefore, the scope protected by the present invention is based on the scope of claims for utility model registration to be described later.

DESCRIPTION OF SYMBOLS 1 Localization apparatus 10 Central control unit 11 Shaft 12 Turntable 13 Movement drive mechanism 14 Servo motor 141 First encoder 142 Drive shaft 15 Reducer 150 Reduction gear unit 151 Output shaft 152 Second encoder 153 Main drive wheel 16 Transmission belt 2 Movable molding station 3 Shaft casing 31 Passive wheel

Claims (2)

A shaft type turntable localization device for an injection molding machine,
The localization apparatus is attached to a movable molding station, and a shaft casing having a passive wheel is installed in the movable molding station. The localization apparatus includes a shaft, a moving drive mechanism, a servo motor, a speed reducer, and a central control unit. Have
The shaft is installed in the shaft casing, and a turntable is attached to one end of the shaft,
The movement drive mechanism attaches the turntable of the shaft to an uninstalled end, interlocks the shaft, and moves in the horizontal direction.
The servo motor has a first encoder and a drive shaft, the servo motor drives rotation of the drive shaft based on the received signal, and the first encoder can sense the rotation signal of the drive shaft. , Transmit the sensing signal to the central control unit,
The speed reducer has a speed reduction gear unit that is attached to the servo motor and can be interlocked with the drive shaft. The speed reduction gear unit has an output shaft, and a second encoder and a main driving wheel are provided on the output shaft. The second encoder senses a rotation signal of the output shaft, and transmits the sense signal to the central control unit,
The central control unit transmits a signal to the servo motor based on a set numerical value, receives signals of the first encoder and the second encoder,
The transmission belt is installed by being fitted to the main driving wheel and the passive wheel, and is driven by the servo motor, whereby the driving shaft is interlocked with the output shaft, and the main driving wheel is interlocked with the rotation of the shaft. Characterized by the
Shaft type turntable positioning device for injection molding machines.   The shaft-type turntable localization apparatus for an injection molding machine according to claim 1, wherein the first encoder and the second encoder are rotary encoders.

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