JPS61102224A - Automatic controlling device of end of operation in injection molder - Google Patents

Abstract

PURPOSE:To furnish an automatic controlling device of end of operation, which perform purging the set number of times depending upon molding material with no misoperation, by a method wherein an injection molder automatically performs ending treatments such as purging and the like and turns OFF the power source to stop itself, when the end-of-operation command is inputted. CONSTITUTION:Firstly, when the end-of-operation command is inputted, an injection unit retreating controlling means E drives an injection unit shifting means A in order to retreat an injection unit by a certain amount and at the same time puts a material supply stopping means D into actuation in order to stop the supplying of material from a hopper to a heating cylinder. Secondly, a purging controlling means F puts an injection driving means C into actuation in order to inject so as to discharge the molten material in the heating cylinder. Thirdly, purging treatment, which is done by driving a screw for a certain period of time by means of a screw rotatingly driving means B under the condition that the screw is retreated, is repeated. After the repetition of the purging by the set number of times, a number-of-time of purging controlling means G brings the action of the purging controlling means F into stop in order to bring the end-of-operation treatment to an end.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an end-of-operation control device for an injection molding machine.

Conventional technology When a set number of products have been manufactured and the injection molding machine is finished operating, or when the day's operation is finished, the injection unit is moved backward to remove the nozzle from the mold, and the hopper is removed from the hopper. The material supply is stopped and the screw is advanced to discharge the molding material from the heating cylinder, then the screw is retracted, the screw is rotated for a certain period of time, and the screw is advanced again.

It is necessary to complete the operation by repeating the operation of making one backward rotation several times, which is called purging.

In conventional injection molding machines, such operations were performed manually by an operator.

Problems to be Solved by the Invention According to the present invention, when the operation of an injection molding machine is to be terminated, the operation associated with the termination is automatically performed and the injection molding machine is stopped.

Means for Solving the Problems Fig. 1 is a diagram showing the configuration of the present invention. and an injection unit moving means Δ for moving the injection unit in the direction of the screw axis, wherein the injection unit moves the injection unit moving means A by a command to end the operation and retreats by a certain amount to remove the nozzle from the mold. A retraction control means E, a material supply stop means for closing the hopper mouth and stopping the supply of molding material in response to an operation end command, and retraction of the injection unit drive the injection drive means C to retract the screw after injection. Thereafter, a purging control means F drives the screw rotation drive means B to alternately repeat injection and screw rotation to rotate the screw for a certain period of time, and the purging control means F counts the number of injections by the purging control means F and when a set number of injections is reached, the purging control is performed. A purging frequency control means G for stopping the operation of the means is provided so that the operation termination process is automatically performed in the injection molding machine.

When the operation end command is input, the injection unit retraction control means E drives the injection unit moving means to retreat by a certain amount, and also operates the material supply stop means to stop the material supply from the hopper to the heating cylinder. The material supply is stopped, and then the purging control means F drives the injection drive means C to perform injection to discharge the molten material in the heating cylinder, and then the screw is retracted, and the screw rotation drive manual means B A purging process in which the screw is rotated for a certain period of time is repeatedly performed, and when purging has been performed a set number of times, the purging number control means G stops the operation of the purging control means F, and the operation termination process is completed.

Example
j. Fig. 2 is a block diagram of one embodiment of the present invention.
is an injection unit, 2 is a heating cylinder, 3 is a screw,
4 is a nozzle, 5 is a hopper for supplying molding material, S
QL is a solenoid for opening and closing the material supply port of the hopper 5, 6 is a screw shaft, and 7 is a screw rotation mechanism in the screw rotation drive means for rotating the screw 3, and a spline provided on the screw shaft 6. It consists of a gear having a spline groove that engages with the shaft, and a gear connected to a screw rotation motor M1 that drives the gear. Reference numeral 8 denotes an injection mechanism in an injection drive means for advancing the screw 3 in the axial direction to perform injection, and the injection mechanism 8 is driven by an injection servo motor M2. In this embodiment, the injection mechanism 8 includes a pressure plate 9 that presses the screw shaft 6, and a ball that screws into a pole nut fixed to the pressure plate 9 to move the pressure plate 9 in the axial direction of the screw 3. It consists of screws 10a and 10b, and timing pulleys 118 and 11b that are rotated via a timing belt 12 by a timing pulley 128 that is fixed to the ball screws 10a and 10b and rotated by the drive of an injection servo motor M2. PC is a pulse coder provided on a servo motor M2, 13 is a slide base, and the injection unit 1 is slidably placed on the slide base 13. M3 is a motor in the injection unit moving means that slides the injection unit 1; LS is a limit switch that detects when the injection unit is moved backward by the motor M3 and has retreated by a certain amount; 14 is a control device; In the example, a central processing unit (hereinafter referred to as CPU) 15 that controls the entire injection molding machine, a memory 16 that stores a control program for controlling the injection molding machine, a memory 16 for arithmetic processing, etc., an output circuit 17, It consists of an input circuit 18 and one manual input device provided on an operation panel or the like for manually issuing various commands to the injection molding machine. 20 is a reversible counter that counts forward and reverse pulses from the pulse coder, and 21, 22, and 23 are motors M1. Servo motor M
2. This is a motor drive control device for driving and controlling the motor M3.

Next, the operation of this embodiment will be explained along with the operation processing flow shown in FIG.

When the set planned quantity of products has been manufactured, or when the operator inputs an operation termination command from one manual input device, the CPU 15 first drives the motor M3 to move the injection unit 1 backward along the slide base 13. , remove the nozzle 4 from the mold (right side in Figure 2) (Step 8)
1). Then, it is determined whether or not the limit switch LS is turned on (step S2). If it is turned on, the drive of the motor M3 is stopped (step S3), and the solenoid S
Turn off the QL and close the material supply port of hopper 5,
The supply of molding material from the hopper 5 into the heating cylinder 2 is stopped (step S4), and the register R is cleared (step S5). Next, the injection servo motor M2 is driven to advance the screw 3 to discharge the molding material remaining in the heating cylinder 2, and the value of the reversible counter 20 that counts the pulses from the pulse coder PC indicates the advance of the screw 3. The injection servo motor M2 is driven until the value L1 reaches the limit position, and when that value is reached, the injection servo motor M2 is stopped and "1" is added to the register R (
Steps 86.87.88). Next, the value of the resistor R is the parsing frequency value R set from the manual input device 19.
It is determined whether or not O has been reached (step S9), and if it has not been reached, the injection servo motor M2 is reversed to retract the screw by a certain amount (step 510), and the value of the counter 20 is set to a certain amount by the screw 3. It is determined whether the servo motor M2 has reached the retreating value L2 (step 511), and when it reaches a certain value, the injection servo motor M2 is stopped (step 512), and the timer king is reset and started (step 13). ) and drives the motor M1 to rotate the screw 3 (step 514). Then, when the timer king reaches a certain value To, that is, when the screw 3 is rotated for a certain period of time, the motor M1 is stopped (steps 315 and 816), and the process from step 86 onwards is repeated again, and the value of the register R is set to the set value. When RO is reached, that is, after purging has been performed a set number of times (step S9), the injection molding machine is turned off after closing the mold (step 520), and the operation of the injection molding machine is terminated.

In this embodiment, the solenoid S'OL is driven after the injection unit has retreated, but it may be driven at step S1 in FIG. 3 at the same time as the operation termination command is input. Further, if the motor M3 of the injection unit moving means is a servo motor, the limit switch LS is not necessary.

Effects of the Invention As described above, when an operation termination command is input, the injection molding machine automatically performs termination processing such as purging, and then turns off the power and stops, so there is no need to terminate operation. There is no need for the operator to carry out the associated work, and since purging is performed the number of times set according to the molding material, there is no erroneous operation and it is safe.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is an operational processing flow of the simultaneous collision embodiment. 1... Injection unit, 2... Heating cylinder, 3...
・Screw, 4... Nozzle, 5... Popper, 7
...screw rotation mechanism, 8...injection mechanism, 14.
・・Control device, LS・Limit switch, SOL・
... Solenoid, Ml, M3... Motor, M2...
Servomotor.

Claims (1)

[Claims] In an injection molding machine having a screw rotation drive means for rotating the screw, an injection drive means for moving the screw in the axial direction to perform injection, and an injection unit moving means for moving the injection unit in the screw axial direction, the operation termination command an injection unit retraction control means that drives the injection unit moving means to move the injection unit backward by a certain amount and remove the nozzle from the mold; a material supply stop means that closes the hopper mouth and stops the supply of molding material in response to an operation end command; and an injection unit purging control means that alternately repeats injection and screw rotation in which the injection driving means is driven by the retraction of the screw, and after the screw is retracted after injection, the screw rotation driving means is driven to rotate the screw for a certain period of time;
An automatic operation termination control device for an injection molding machine, comprising a purging number control means that counts the number of injections performed by the purging control means and stops the operation of the purging control means when a set number of injections is reached.