JP2002079562A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine with such advantage that power consumption can be saved, operating safety can be enhanced, and further it is damage- proof. SOLUTION: This injection molding machine operates in such a way that when the temperature of a cylinder heating-up completion state at which the temperature of a cylinder heater 3 is increased upto the level of a molding temperature of the injection molding machine, is detected by a cylinder heater temperature sensor 5, a control device 7 controls a heater power supply device 4 at the time of the lapse of a first setting time under such a state that an operation detecting signal from an injection operating sensor 6 is not received from the point of time when the described cylinder heating-up completion state is realized during the non-automatic operation mode of the injection molding machine. Thus the control device 7 switches the temperature of the cylinder heater 3 to the lower level of heat retention than the molding temperature and then makes the heater power supply device 4 stop the supply of power to the cylinder heater 3 at the time of the lapse of a second setting time under such a state that the operation detecting signal from the injection operating sensor 6 is not received from the point of time when the temperature of the cylinder heater 3 is switched to the level of heat retention.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an injection molding machine for injecting and molding a resin, and more particularly to an injection molding machine for controlling a cylinder heater for heating a cylinder of the injection molding machine.

[0002]

2. Description of the Related Art Conventionally, as a method for switching the cylinder temperature setting of an injection molding machine, a method described in Japanese Patent Application Laid-Open No. H10-156908 has been known. This method of switching the cylinder temperature setting of the injection molding machine is performed when the operation of the injection molding machine has not been confirmed for a certain period of time or longer when the temperature of the cylinder of the injection molding machine has been completed and the operation mode is not automatic. The temperature is switched to the heat retention temperature setting.If the operation mode is automatic operation, the cylinder temperature setting is maintained at the molding temperature setting during normal operation as if there was an operation input, and the heat retention temperature setting when the injection molding machine stops. Is switched to

[0003]

However, in the conventional switching method of the cylinder temperature setting of the injection molding machine,
Since the cylinder temperature is not controlled after switching the cylinder temperature to the warming temperature setting and switching to the warming temperature setting, there is a problem that power consumption increases and safety is low. An object of the present invention is to provide an injection molding machine capable of reducing power consumption, improving safety, and preventing damage.

[0004]

According to one aspect of the present invention, there is provided an injection molding machine main body, a cylinder for receiving resin from the injection molding machine main body, and a cylinder heater for heating the cylinder. A heater power supply for supplying power to the cylinder heater of the injection molding machine, a cylinder heater temperature sensor for detecting a temperature of the cylinder heater, and an operation detection for detecting that the main body of the injection molding machine has been operated. An injection operation sensor for generating a signal,
A control device connected to the heater power supply device, the cylinder heater temperature sensor and the injection operation sensor,
A setting device connected to the control device, wherein the setting device can set information of a first set time and a second set time and input the information to the control device, and the control device When the cylinder heater temperature sensor detects the temperature of the cylinder heating completion state in which the temperature of the cylinder heater has been raised to the molding temperature of the injection molding machine and the operation of the injection molding machine is not in automatic operation, the cylinder temperature rises. When the first set time has elapsed without receiving the operation detection signal from the injection operation sensor from the time when the temperature has reached the temperature completion state, the heater power supply device is controlled to control the temperature of the cylinder heater to the molding temperature. The second setting is switched to a lower heat retaining temperature and without receiving the operation detection signal from the injection operation sensor from the time of switching to the heat retaining temperature. It said heater power source device when the time has elapsed, characterized in that stops supplying power to the cylinder heater.

According to a second aspect of the present invention, in the injection molding machine according to the first aspect, the control device is configured to control the first set time, the second set time and the second set time for each type of resin used. It is characterized in that the information on the heat retention temperature is inputted and held in advance. According to a third aspect of the present invention, there is provided a heater power supply for supplying power to the cylinder heater of an injection molding machine having an injection molding machine main body, a cylinder for receiving resin from the injection molding machine main body, and a cylinder heater for heating the cylinder. A cylinder heater temperature sensor for detecting a temperature of the cylinder heater; an injection operation sensor for detecting that the injection molding machine has been operated to generate an operation detection signal; the injection molding machine main body and the heater power supply A control device connected to the device, the cylinder heater temperature sensor and the injection operation sensor, and a setting device connected to the control device, wherein the setting device has a first set time and a second set time Information that can be input to the control device and automatically purged the resin that has accumulated inside the cylinder. The automatic purge information can be input to the control device by setting the temperature of the cylinder heater, and the temperature of the cylinder heater has been raised to the molding temperature of the injection molding machine. When the cylinder heater temperature sensor detects that the operation of the injection molding machine is not in automatic operation and the cylinder temperature rise is completed from the time when the cylinder temperature rise is completed, and the operation detection signal from the injection operation sensor is not received and the When the first set time has elapsed, the heater power supply device is controlled to switch the temperature of the cylinder heater to a heat retaining temperature lower than the molding temperature, and the automatic purge information is input when the temperature is switched to the heat retaining temperature. The resin is automatically purged from the cylinder to the injection molding machine body, and the injection operation is started from the time when the temperature is switched to the heat retaining temperature. The heater power source device when the second set time has elapsed in a state not receiving the operation detection signal from the capacitors is equal to or stopping to supply electric power to the cylinder heater. The invention according to claim 4 is the invention according to claim 3.
In the injection molding machine described in the above, the control device, when automatically purging the resin from the cylinder, automatically adjusts the injection speed and injection pressure for injecting the resin from the injection speed and injection pressure during operation of the injection molding machine. The injection molding machine body is controlled so as to lower the pressure. According to a fifth aspect of the present invention, in the injection molding machine according to the third or fourth aspect, the control device includes information on the first set time and the second set time for each type of resin used. And the information on the heat retention temperature and the automatic purge information are input and held in advance.

[0006]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an injection molding machine according to one embodiment of the present invention. As shown in FIG. 1, the injection molding machine includes an injection molding machine main body 1, a cylinder 2 for receiving a resin from the injection molding machine main body 1,
And a cylinder heater 3 for heating the cylinder 2. Further, the injection molding machine includes a heater power supply device 4;
A cylinder heater temperature sensor 5, an injection operation sensor 6,
A control device 7 and a setting device 8 are provided. The heater power supply 4 is connected to the cylinder heater 3 and supplies power to the cylinder heater 3. Cylinder heater temperature sensor 5
Is disposed so as to be in contact with the cylinder heater 3 and detects the temperature of the cylinder heater 3 to generate a detected temperature signal.
The injection operation sensor 6 is disposed near the injection molding machine main body 1 and detects that an operation switch (not shown) of the injection molding machine has been operated, and generates an operation detection signal. Control device 7
Are connected to the injection molding machine body 1, the heater power supply device 4, the cylinder heater temperature sensor 5, and the injection operation sensor 6. The control device 7 receives the detected temperature signal and the operation detection signal from the cylinder heater temperature sensor 5 and the injection operation sensor 6. The setting device 8 is connected to the control device 7. The setting device 8 is capable of setting information on the first set time and the second set time and inputting the information to the control device 7, and also has an automatic purge for automatically purging the resin remaining inside the cylinder 2. Information can be set and this automatic purge information can be input to the control device 7. Control device 7
When the temperature of the cylinder heater 3 is raised to the molding temperature of the injection molding machine and the cylinder heater temperature sensor 5 detects the temperature of the cylinder heating completion state, the cylinder temperature rises when the operation of the injection molding machine is not in automatic operation. When the first set time elapses without receiving the operation detection signal from the injection operation sensor 6 from the time when the temperature is completed, the heater power supply device 4 is controlled to control the temperature of the cylinder heater 3 to the molding temperature. Switch to lower heat retention temperature. Further, the control device 7 causes the injection molding machine main body 1 to automatically purge the resin from the cylinder 2 when the automatic purging information is input when the temperature is switched to the heat retaining temperature. Further, the control device 7 does not receive the operation detection signal from the injection operation sensor 6 at the time when the temperature
When the set time elapses, the heater power supply device 4 stops supplying power to the cylinder heater 3. Further, when automatically purging the resin from the cylinder 2, the control device 7 performs injection molding such that the injection speed and the injection pressure for injecting the resin are automatically made lower than the injection speed and the injection pressure during the operation of the injection molding machine. The main body 1 is controlled. The control device 7 has previously input and retains the information on the first set time and the second set time, the information on the heat retention temperature, and the information on the automatic purge for each type of resin used. Note that the control device 7 may input and hold only information on the first set time and the second set time for each type of resin used. The control device 7
May not previously hold the information on the first set time and the second set time, the information on the heat retention temperature, and the information on the automatic purge for each type of resin used.

Next, the operation of the injection molding machine according to one embodiment of the present invention will be described in more detail with reference to FIG. FIG. 2 is a flowchart for explaining the operation of the injection molding machine shown in FIG. First, when a material code is input using the setting device 8 (step S1), the control device 7 uses the information of the timer 1 and the timer 2 based on the material code (the first set time and the second set time). Information), information on the heat retention temperature and information on the presence or absence of automatic purging are set (step S2). When the heater switch is turned on (step S3), control of the cylinder temperature is started, and it is determined whether or not the temperature of the cylinder heater 3 has been raised to the molding temperature of the injection molding machine (step S4). Whether the operation switch has been operated when the temperature has been raised,
That is, it is determined whether or not the control device 7 has received the operation detection signal from the injection operation sensor 6 (step S5).
When the operation switch is not operated, the control device 7 determines whether or not the injection molding machine is in automatic operation (step S).
6). When the automatic operation is not being performed, the timer 1 starts counting (step S7), and it is determined whether or not the timer 1 has timed up, that is, whether or not the first set time has elapsed (step S8). . When the timer 1 times out, it is determined whether or not the heat retention setting is set (step S
9) If it is not the heat retention setting, switch to the heat retention setting (step S10). When the heat retention is being set, the process proceeds to step S14. After switching to the heat retention setting, automatic purging is started (step S12). When the timer 1 does not time out, the process returns to step S4. Timer 2 after completion of automatic purge
Starts counting (step S13), and determines whether or not the timer 2 times out, that is, whether or not the second set time has elapsed (step S14). When the timer 2 times out, the heater control is turned OFF, that is, the heater power supply 4 stops supplying power to the cylinder heater 3 (step S15).
When the timer 2 has not expired, the process returns to step S4. If the temperature is not completely raised in step S4,
When the operation of the injection molding machine is confirmed in step 5 and during automatic operation, the timers 1 and 2 are reset (step S16), and the process returns to step S4.

[0008]

As described above, according to the first or second aspect of the present invention, the control device controls the temperature of the cylinder heating completion state in which the temperature of the cylinder heater has been raised to the molding temperature of the injection molding machine. When the cylinder heater temperature sensor detects that the operation of the injection molding machine is not in automatic operation, the first setting is performed in a state in which no operation detection signal is received from the injection operation sensor from the time when the cylinder temperature rise is completed. When the time elapses, the heater power supply device is controlled to switch the temperature of the cylinder heater to a heat retaining temperature lower than the molding temperature, and receives the operation detection signal from the injection operation sensor from the time when the temperature is switched to the heat retaining temperature. Since the heater power supply stops supplying power to the cylinder heater when the second set time elapses in a state where there is no power, the power consumption is reduced. It can be, and can improve safety. Any one of claims 3 to 5
According to one aspect of the present invention, when the cylinder heater temperature sensor detects the temperature of the cylinder heating completion state in which the temperature of the cylinder heater has been raised to the molding temperature of the injection molding machine, the control device performs the injection. When the first set time has passed without receiving an operation detection signal from the injection operation sensor from the time when the cylinder temperature was completed when the operation of the molding machine was not in automatic operation, the heater power supply device was controlled. The temperature of the cylinder heater is switched to a heat retaining temperature lower than the molding temperature, and when the automatic purging information is input when the temperature is switched to the heat retaining temperature, the injection molding machine body is automatically purged with resin from the cylinder, and When the second set time has elapsed without receiving the operation detection signal from the injection operation sensor from the time when the temperature is switched to the heat retaining temperature, the heat Since power supply to stop supplying power to the cylinder heater, it is possible to reduce the power consumption, and can be prevented from being damaged.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an injection molding machine according to one embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the injection molding machine shown in FIG.

[Description of Signs] 1 Injection molding machine main body, 2 cylinder, 3 cylinder heater 3, 4 heater power supply device, 5 cylinder heater temperature sensor 5, 6, injection operation sensor, 7 control device, 8 setting device

Claims (5)

[Claims] A heater power supply unit for supplying power to said cylinder heater of an injection molding machine having an injection molding machine main body, a cylinder for receiving resin from said injection molding machine main body, and a cylinder heater for heating said cylinder; A cylinder heater temperature sensor for detecting a temperature of the cylinder heater, an injection operation sensor for detecting that the injection molding machine main body is operated and generating an operation detection signal, the heater power supply device, the cylinder heater temperature sensor, and the A control device connected to the injection operation sensor; and a setting device connected to the control device, wherein the setting device sets information of a first set time and a second set time, and sets the information of the control device. The controller can complete the cylinder temperature increase in which the temperature of the cylinder heater is increased to the molding temperature of the injection molding machine. When the temperature of the state is detected by the cylinder heater temperature sensor, the operation of the injection molding machine is not in the automatic operation, and the operation detection signal from the injection operation sensor is not received from the time when the cylinder temperature is completed. When the first set time has elapsed in the state, the heater power supply device is controlled to switch the temperature of the cylinder heater to a heat retaining temperature lower than the molding temperature, and the injection operation sensor is switched from the time when the temperature is switched to the heat retaining temperature. Wherein the heater power supply unit stops supplying power to the cylinder heater when the second set time elapses without receiving the operation detection signal from the injection molding machine. 2. The injection molding machine according to claim 1, wherein
The control device may control the first type for each type of resin used.
The information of the set time, the second set time, and the heat retaining temperature is input and held in advance. 3. A heater power supply for supplying power to said cylinder heater of an injection molding machine having an injection molding machine main body, a cylinder for receiving resin from said injection molding machine main body, and a cylinder heater for heating said cylinder. A cylinder heater temperature sensor for detecting a temperature of a cylinder heater, an injection operation sensor for detecting that the injection molding machine has been operated and generating an operation detection signal, the injection molding machine main body, the heater power supply device, and the cylinder A control device connected to the heater temperature sensor and the injection operation sensor; and a setting device connected to the control device, wherein the setting device sets information of a first set time and a second set time. Automatic purge information that can be input to the control device and that automatically purges the resin remaining inside the cylinder. The automatic purge information can be input to the control device, and the control device can set the temperature of the cylinder heating completion state in which the temperature of the cylinder heater has been raised to the molding temperature of the injection molding machine to the cylinder. When the operation of the injection molding machine is not in automatic operation when the heater temperature sensor detects the first temperature in a state where the operation detection signal from the injection operation sensor is not received from the time when the cylinder temperature rise is completed. When the set time has elapsed, the heater power supply device is controlled to switch the temperature of the cylinder heater to a heat retaining temperature lower than the molding temperature. When the automatic purge information is input when the temperature is switched to the heat retaining temperature, the injection is performed. The molding machine body is automatically purged with resin from the cylinder, and from the time when the temperature is switched to the heat retaining temperature, the injection operation sensor detects Injection molding machine in which the heater power supply device is characterized in that stops supplying power to the cylinder heater when serial the second set time in the state free from the operation detection signal has elapsed. 4. The injection molding machine according to claim 3, wherein
The controller is configured to automatically reduce the injection speed and the injection pressure for injecting the resin when the resin is automatically purged from the cylinder so as to automatically lower the injection speed and the injection pressure during the operation of the injection molding machine. An injection molding machine characterized by controlling the machine body. 5. The injection molding machine according to claim 3, wherein the control device includes information on the first set time and the second set time for each type of resin used, and the heat retention. An injection molding machine wherein temperature information and the automatic purge information are inputted and held in advance.