JP3619449B2 - Electric injection molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric injection molding machine including a drive unit that is driven by a drive motor.
[0002]
[Prior art and problems]
Conventionally, an injection molding machine disclosed in Japanese Patent Laid-Open No. 9-11290 has been known as an electric injection molding machine including a drive unit using a drive motor.
[0003]
The injection molding machine (injection apparatus) disclosed in the publication includes a measuring servo motor and a drive unit using the injection servo motor. In the measuring step, the rotation of the measuring servo motor is screwed via a rotation transmission mechanism. In the injection process, the rotation of the injection servo motor is converted into a straight movement through the ball screw mechanism, and the screw is advanced to perform injection.
[0004]
However, since such a conventional electric injection molding machine has a relatively low operating noise during operation, when it is installed in a factory with a high noise level, it is in operation or stopped, or where. In many cases, it is difficult to determine whether the drive unit is operating. Therefore, if the operator mistakenly determines that the machine is stopped even though it is in operation, a situation may occur in which the work that was originally stopped is performed during operation. There was a problem that invited or compromised safety.
[0005]
The present invention solves such a problem existing in the prior art, and makes it possible to accurately and surely determine whether the drive unit is operating or stopped or which drive unit is operating. It is an object of the present invention to provide an electric injection molding machine that can solve problems that cause erroneous operations and work or that impairs safety.
[0006]
[Means for Solving the Problems and Embodiments]
In the present invention, when configuring an electric injection molding machine M including a drive unit 3a using one or more drive motors 2a ..., a preset operation notification sound is generated by the operation of the drive motors 2a ... In addition, an operation notification unit 4x that stops the operation notification sound by stopping the drive motors 2a is provided.
[0007]
In this case, according to a preferred embodiment, the operation notification unit 4x can generate different types of operation notification sounds corresponding to the respective drive motors 2a. The drive motor 2a ... includes one or more of a metering motor 2a, an injection motor 2b, a mold opening / closing motor 2c, a mold clamping motor 2d, and a protruding motor 2e.
[0008]
Thus, even when the electric injection molding machine M is installed in a factory with a high noise level, the operator is in operation by the operation notification sound generated in response to the operation of the drive motor 2a. It is possible to accurately and reliably determine whether there is a stop or where the drive unit 3a is operating.
[0009]
【Example】
Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.
[0010]
First, the configuration of the electric injection molding machine M according to the present embodiment will be described with reference to FIG.
[0011]
The electric injection molding machine M shown in FIG. 1 shows only the injection device Mi excluding the mold clamping device. The injection device Mi includes an injection table 11 and a drive table 12 that are separated from each other, and the rear end of the heating cylinder 13 is supported by the front surface of the injection table 11. The heating cylinder 13 includes an injection nozzle 14 at the front end and a hopper 15 that supplies a molding material to the inside of the heating cylinder 13 at the rear, and a screw 16 is inserted into the heating cylinder 13. On the other hand, four tie bars 17 are installed between the injection table 11 and the drive table 12, and a slide block 18 is slidably loaded on the tie bars 17. A rotary block 20 integrally having a driven pulley 19 is rotatably supported at the front end of the slide block 18, and the rear end of the screw 16 is coupled to the center of the rotary block 20. Further, a weighing servomotor (drive motor) 2a provided with a rotary encoder 21 is attached to the side surface of the slide block 18, and between the drive pulley 22 and the driven pulley 19 fixed to the rotating shaft of the measurement servomotor 2a, An endless timing belt 23 is bridged to constitute a measuring drive unit 3a.
[0012]
On the other hand, a nut portion 26 is provided coaxially and integrally on the rear portion of the slide block 18, and the front side of a ball screw portion 27 that is rotatably supported by the drive base 12 is screwed into the nut portion 26, thereby A screw mechanism 25 is configured. On the other hand, a driven pulley 28 is attached to the rear end of the ball screw portion 27 protruding rearward from the drive base 12, and an injection servo motor (with a rotary encoder 29 attached to the support board 12 s attached to the drive base 12 ( (Drive motor) 2b is attached, and a timing belt 31 is bridged between a drive pulley 30 and a driven pulley 28 fixed to the rotating shaft of the servo motor 2b to form an injection drive unit 3b.
[0013]
Reference numeral 41 denotes a controller that controls various controls of the entire electric injection molding machine M. The measuring servo motor 2a and the injection servo motor 2b are connected to the motor connecting portion of the controller 41, and the encoder connection of the controller 41 is connected. The rotary encoders 21 and 29 are connected to the section.
[0014]
On the other hand, the operation notification unit 4x is provided according to the present invention. The operation notification unit 4x generates a preset operation notification sound by the operation of the weighing servo motor 2a, and stops the operation notification sound by stopping the measurement servo motor 2a. An injection operation notification unit 4xb that generates a preset operation notification sound by the operation of the servo motor 2b and stops the operation notification sound by the stop of the injection servo motor 2b is provided. The measuring operation notifying unit 4xa includes an operation detecting unit 51 to which the detection pulse Pda of the rotary encoder 21 is input, a signal generating unit 52 having a tone setting function to which a detection signal output from the operation detecting unit 51 is input, An output amplifier 53 to which the output signal of the generating unit 52 is input and a speaker 54 connected to the output unit of the output amplifier 53 are provided, and the injection operation notifying unit 4xb is an operation detecting unit to which the detection pulse Pdb of the rotary encoder 29 is input. 55, a signal generating unit 56 having a tone setting function for inputting a detection signal output from the operation detecting unit 55, an output amplifier 57 for inputting an output signal of the signal generating unit 56, and an output unit of the output amplifier 57. A speaker 58 is provided.
[0015]
In this case, the signal generators 52 and 56 generate an operation notification sound signal for generating an operation notification sound. As an operation notification sound signal generation method, an operation notification sound signal having an arbitrary audible band frequency may be oscillated by an oscillation circuit, or detection pulses Pda and Pdb are output as they are from the operation detection units 51 and 55, and this detection is performed. The operation notification sound signal may be generated by directly converting the pulses Pda and Pdb. In addition, the signal generation units 52 and 56 vary the type of the operation notification sound signal. As a method of different types, the pitch and tone color of the sound may be changed, or the sound generation interval may be changed by giving the sound intermittent characteristics. Reference numerals 52v and 56v denote volume adjusters. The type and volume of the operation notification sound signal can be arbitrarily set according to the environment where the electric injection molding machine M is installed, the operator's preference, and the like.
[0016]
Next, the operation (function) of the electric injection molding machine M according to the present embodiment will be described with reference to the flowchart shown in FIG.
[0017]
Assume that the electric injection molding machine M is operated (step S1). In the measuring process, the screw 16 is rotated by the operation of the measuring servo motor 2a and the weighing is performed. The rotation of the measuring servo motor 2a is detected by the rotary encoder 21, and the controller 41 detects the back pressure and the position of the screw 16. Feedback control is performed. Further, in the injection process, the screw 16 is advanced by the operation of the injection servo motor 2b and the motion conversion function of the ball screw mechanism 25 to perform injection, and the rotation of the injection servo motor 2b is detected by the rotary encoder 29, The controller 41 performs feedback control on the speed, position and pressure of the screw 16.
[0018]
On the other hand, when the servo motors 2a and 2b are operated, detection pulses Pda and Pdb are output from the rotary encoders 21 and 29 and applied to the controller 41. At the same time, the detection pulses Pda and Pdb are sent to the operation detection units 51 and 55, respectively. Is also granted. Thereby, the operation of each servo motor 2a, 2b is detected by the operation detectors 51, 55, and a detection signal is given from the operation detectors 51, 55 to the signal generators 52, 56, so that the signal generators In 52 and 56, operation notification sound signals having different tones are generated (steps S2 and S3). The operation notification sound signal output from the signal generators 52 and 56 is amplified by the output amplifiers 53 and 57, and is output (generated) as the operation notification sound from the speakers 54 and 58 (step S4).
[0019]
When the servo motors 2a and 2b are stopped, the detection pulses Pda and Pdb from the rotary encoders 21 and 29 are also stopped, so that the detection given to the signal generators 52 and 56 from the operation detectors 51 and 55 is detected. The signal is also stopped, so that the operation notification sound output from the speakers 54 and 58 is also stopped (steps S2 and S5). The generation or stop of the operation notification sound that is linked to the operation or stop of each of the servo motors 2a and 2b is repeated in the same manner until the operation of the electric injection molding machine M is completed (step S6).
[0020]
Therefore, even when the electric injection molding machine M is installed in a factory with a lot of noise, the operator is in operation by the operation notification sound generated corresponding to the operation of each servo motor 2a, 2b. It is possible to accurately and surely determine whether the drive unit is in a stopped state or not, and depending on the different operation notification sound set for each drive unit 3a. Thus, it is possible to accurately and surely know which drive unit 3b is used, and it is possible to eliminate the problem of inadvertent operation or erroneous operation or loss of safety.
[0021]
In the embodiment of FIG. 1 described above, the injection device Mi has been described as an example, but the injection device Mi can be implemented throughout the electric injection molding machine M. That is, in the embodiment of FIG. 1, the description has been given with reference to the measuring servo motor 2a and the injection servo motor 2b. However, the electric injection molding machine M includes a mold opening / closing servo motor 2c shown in FIG. Since the servo motor 2d and the protruding servo motor 2e are provided, the servo motors 2c, 2d, and 2e can be implemented in the same manner as the servo motors 2a and 2b described above.
[0022]
In the embodiment of FIG. 1, the operation notification unit 4x for generating the operation notification sound is shown. However, as shown in FIG. 3, the operation notification lamp is turned on by the operation of each servo motor 2a ... An operation notification unit 4y that turns off the operation notification lamp by stopping 2a may be provided. In this case, the operation notification lamps are connected to the output units of the operation detection units 51 and 55 in the circuit of the operation notification unit 4x shown in FIG. 1, and are lit by detection signals output from the operation detection units 51 and 55. That's fine. The color of each operation notification lamp is made different according to each servo motor 2a. That is, the operation notification lamp of the operation notification unit 4ya corresponding to the weighing servo motor 2a corresponds to the A color, and the operation notification lamp of the operation notification unit 4yb corresponding to the injection servo motor 2b corresponds to the B color, the mold opening / closing servo motor 2c. The operation notification lamp of the operation notification unit 4yc is C color, the operation notification lamp of the operation notification unit 4yd corresponding to the mold clamping servomotor 2d is D color, the operation notification lamp of the operation notification unit 4ye corresponding to the protruding servomotor 2e. Can be set like E color.
[0023]
Furthermore, you may implement by the combination of the operation | movement alerting | reporting part 4x and the operation | movement alerting | reporting part 4y. The operation notification unit 4x shown in FIG. 3 has the tone P of the operation notification sound of the operation notification unit 4xa corresponding to the measuring servo motor 2a and the operation notification sound of the operation notification unit 4xb corresponding to the injection servo motor 2b. The height is tone Q, the height of the operation notification sound of the operation notification unit 4xc corresponding to the mold opening / closing servomotor 2c is the tone R, and the height of the operation notification sound of the operation notification unit 4xd corresponding to the mold clamping servomotor 2d. Is the tone S, and the tone of the operation notification sound of the operation notification unit 4xe corresponding to the protruding servo motor 2e is set to tone T. Therefore, for example, when the operation notifying unit 4xa and the operation notifying unit 4ya are combined to operate the measuring servo motor 2a, the operation notification sound of the tone P is generated at the same time as the A-color operation notification lamp is turned on. Become.
[0024]
On the other hand, in the embodiment of FIG. 1, the case where the detection pulses Pda and Pdb output from the rotary encoders 21 and 29 are used as means for detecting the operation or stop of the servo motors 2a and 2b is shown, but FIG. As described above, each servo motor 2b is detected from a detection signal output from an acceleration sensor 61 that detects the acceleration of a movable portion driven by each servo motor 2b, for example, the nut portion 26 of the ball screw mechanism 25, or from each servo amplifier 62. A detection signal output from the current detector 63 that detects the drive current Id supplied to the signal... May be used.
[0025]
Although the embodiments have been described in detail above, the present invention is not limited to such embodiments, and the detailed configuration, shape, circuit configuration, technique, and the like can be arbitrarily set within the scope of the present invention. Can be changed, added or deleted. For example, the servo motor is exemplified as the drive motor 2a ..., but other types of drive motors can be similarly applied. Further, the present invention may be applied to all of the five illustrated servo motors (drive motors) or may be applied to a part thereof. Furthermore, the operation notification lamp is a concept including all display means that can be visually recognized, and it does not matter whether light is emitted or not. Accordingly, the concept of the operation notification lamp in the present invention includes changing the color plate from white to blue.
[0026]
【The invention's effect】
Thus, in the electric injection molding machine having a drive unit using one or two or more drive motors, the present invention generates a preset operation notification sound by the operation of the drive motor and stops the drive motor. Since the operation notification unit for stopping the operation notification sound is provided, even when the electric injection molding machine is installed in a factory with a large noise, the operation notification sound generated in response to the operation of the drive motor, The operator can accurately and reliably determine whether the drive is operating or stopped, or where the drive unit is operating, and eliminates malfunctions that lead to incorrect operations or work, or that impairs safety. There is a remarkable effect of being able to.
[Brief description of the drawings]
FIG. 1 is a main part configuration diagram of an electric injection molding machine according to a preferred embodiment of the present invention;
FIG. 2 is a flowchart for explaining the operation (function) of the electric injection molding machine;
FIG. 3 is a block system diagram showing a main part according to another embodiment of the electric injection molding machine;
FIG. 4 is a schematic configuration diagram of a main part showing another embodiment of the electric injection molding machine;
[Explanation of symbols]
2a ... Drive motor (servo motor)
3a ... Drive unit M Electric injection molding machine 4x Operation notification unit

Claims (3)

In an electric injection molding machine including a drive unit using one or more drive motors, a preset operation notification sound is generated by the operation of the drive motor, and the operation notification sound is stopped by the stop of the drive motor. An electric injection molding machine characterized in that an operation notification unit is provided. 2. The electric injection molding machine according to claim 1, wherein the drive motor includes one or more of a metering motor, an injection motor, a mold opening / closing motor, a mold clamping motor, and a protruding motor. 2. The electric injection molding machine according to claim 1, wherein the operation notification unit generates different types of operation notification sounds corresponding to the respective drive motors.

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