JP4937894B2 - Monitoring device for injection molding machine - Google Patents

Description

  The present invention relates to a monitoring device for an injection molding machine, and more particularly to a monitoring device for an injection molding machine having a function of preventing a cold start of a screw in a heating cylinder.

  An injection molding machine generally has a cold start prevention function. The cold start prevention function is a function that prevents the screw from rotating and starting in a state where the resin in the heating cylinder is not sufficiently heated. For example, when the operation of the injection molding machine is stopped on a holiday and the operation of the injection molding machine is started the next day, if the rotation of the screw is started before the resin in the heating cylinder reaches a predetermined temperature, the screw Excessive torque may be applied to the screw, which may damage the screw. In order to avoid such a problem, a cold start prevention function is provided.

  The conventional cold start preventing function is a function that prevents the rotation of the screw from starting until a predetermined time elapses after the energization of the heater that heats the heating cylinder of the injection molding machine, for example. In other words, the elapsed time from the start of energization of the heater that heats the heating cylinder is measured with a timer, and when a predetermined time has passed that the resin in the heating cylinder will be sufficiently heated, the screw is started. It is something to allow.

  The set time of such a timer is 10 to 30 minutes in a small to medium-sized injection molding machine, and may be 1 hour or more in a large injection molding machine. Since the time required for heating the resin varies depending on the type of resin, the temperature of the resin when heating is started, and the like, the set time of the timer is determined with some margin.

  If the set time of the timer is too long, useless time is consumed until the injection molding machine is operated, and useless power is consumed. Further, the resin may be heated too much, and the resin may be burned in the heating cylinder. On the other hand, if the set time of the timer is too short, the torque of the screw at the start of operation becomes excessive, and the screw may be damaged.

Therefore, a technique has been proposed in which a temperature sensor is provided in the vicinity of the outer wall of the heating cylinder, and cold start is prevented while monitoring the temperature of the heating cylinder based on the temperature detected by the temperature sensor (see, for example, Patent Document 1). .)
JP 11-48299 A

  In the technique disclosed in Patent Document 1 described above, the temperature of the resin in the cylinder is estimated based on the temperature in the vicinity of the outer wall of the heating cylinder. Since the vicinity of the outer wall of the heating cylinder is away from the resin in the heating cylinder, the temperature in the vicinity of the outer wall of the heating cylinder does not always accurately represent the temperature of the resin in the heating cylinder.

  Even if the temperature in the vicinity of the outer wall reaches a predetermined heating temperature, there is a time delay in the temperature rise of the resin in the heating cylinder, so the resin in the heating cylinder has not yet reached the predetermined heating temperature. . Therefore, after the temperature in the vicinity of the outer wall reaches the predetermined heating temperature, it is necessary to wait for the elapse of a predetermined time and to start molding from the time when it is estimated that the resin temperature has surely reached the predetermined heating temperature. In this case, as in the above-described conventional example, if the predetermined waiting time is too long, useless time is consumed until the injection molding machine is operated, and useless power is consumed. Further, the resin may be heated too much, and the resin may be burned in the heating cylinder. On the other hand, if the predetermined waiting time is too short, the torque of the screw at the start of operation becomes excessive, and the screw may be damaged.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an injection molding machine monitoring device capable of releasing the cold start prevention function at an appropriate timing.

  In order to achieve the above object, according to the present invention, there is provided a monitoring device for an injection molding machine, wherein the amount of movement of heat from the vicinity of the outer wall of the heating cylinder toward the vicinity of the inner wall at a predetermined position of the heating cylinder is below a threshold value. An injection molding machine monitoring device is provided, which releases the cold start prevention function when the time is reached.

  The monitoring device for an injection molding machine according to the present invention preferably releases the cold start prevention function when the temperature in the vicinity of the outer wall of the heating cylinder is equal to or higher than a predetermined temperature. Furthermore, the cold start prevention function may be canceled in a state where the molding mode is turned on. Furthermore, a temperature sensor may be provided in the vicinity of the outer wall and the inner wall of the heating cylinder, and the amount of movement of the heat may be obtained based on a temperature detection value by the temperature sensor. Further, it is preferable that the predetermined position of the heating cylinder is either near the resin supply port or near the tip.

  According to the present invention, since the cold start interlock is released based on the amount of heat transfer in the heating cylinder, a state closer to the actual state of the resin in the heating cylinder can be determined, and the cooling can be performed at an accurate timing. The inter-boot prevention function can be canceled. Therefore, the timing for canceling the cold start prevention function is delayed so that the resin temperature does not rise so much that the resin is burned and wasteful heater power is not consumed. In addition, it is possible to prevent the screw from being damaged due to the cold start without causing an excessive torque to be applied to the screw because the timing for releasing the cold start preventing function is too early.

  First, the overall configuration of an injection molding machine monitoring apparatus according to the present invention will be described with reference to FIG. FIG. 1 is a diagram showing an overall configuration of a monitoring apparatus for an injection molding machine according to an embodiment of the present invention.

  An injection device 10 of an injection molding machine includes a heating cylinder 11 (also simply referred to as a cylinder 11) and a screw (not shown) that can rotate and move back and forth in the heating cylinder 11. An injection nozzle 105 having a nozzle opening is provided at the tip of the cylinder 11. A resin supply port (not shown) is formed at a predetermined position of the cylinder 11, and a hopper 12 is connected to the resin supply port via a connecting cylinder (not shown). Resin pellets in the hopper 12 are supplied into the cylinder 11 through the connecting cylinder and the resin supply port.

  As shown in FIG. 1, the cylinder 11 and the injection nozzle 105 are divided into six zones along the longitudinal direction from the cooling cylinder 14 to the injection nozzle 105. Here, in order from the zone adjacent to the cooling cylinder 14 corresponding to the provided heaters, the first zone Z1, the second zone Z2, the third zone Z3, the fourth zone Z4, the fifth zone Z5, This is called the sixth zone Z15. The cooling cylinder 14 is a water cooling cylinder provided to cool the hopper 12 and the vicinity thereof, and is provided to maintain the periphery of the hopper 12 at a certain temperature or lower.

  In the first to fifth zones Z1 to Z5 and the sixth zone Z15, band heaters h1 to h6 that are individually energized are disposed on the outer circumferences of the heating cylinder 11 and the injection nozzle 105, respectively. In other words, planar band heaters h1 to h4 are attached to the outer periphery of the cylinder 11 corresponding to the first to fourth zones Z1 to Z4. Resin pellets can be heated and melted. Similarly, planar band heaters h5 and h6 corresponding to the fifth and sixth zones Z5 and Z15 are attached to the outer periphery of the injection nozzle 105, and the injection nozzle is energized by energizing the band heaters h5 and h6. The temperature of the molten resin in 105 can be maintained.

  In the first zone Z1, temperature sensors A-1 and A-2, which are a set of temperature sensors, are arranged at different positions in the radial direction. Similarly, temperature sensors B-1 and B-2 which are a set of temperature sensors are arranged in the second zone Z2, and temperature sensors C-1 and C which are a set of temperature sensors are also arranged in the third zone Z3. -2 are arranged, temperature sensors D-1 and D-2 which are a set of temperature sensors are also arranged in the fourth zone Z4, and a temperature sensor E-1 which is also a set of temperature sensors in the fifth zone Z5 , E-2, and a temperature sensor F-1, F-2, which is a set of temperature sensors, is also arranged in the sixth zone Z15. In the example shown in FIG. 1, the water cooling cylinder 14 is also provided with one temperature sensor G, and the temperature sensor G detects the temperature of the cooling cylinder 14.

  Since the positions of the temperature sensors in each group with respect to the heating cylinder 11 and the injection nozzle 105 are the same, the temperature sensors A-1 and A-2 shown in FIG. 2 will be described as an example. The temperature sensor A-1 is embedded in a hole having a depth up to the vicinity of the inner wall of the heating cylinder 11 in order to detect the temperature near the inner wall of the heating cylinder 11. The temperature of the inner wall surface of the heating cylinder 11 is detected by the temperature sensor A-1. The temperature sensor A-2 is embedded in a position closer to the heater h1 than the temperature sensor A-1 (near the outer wall of the cylinder). The temperature near the outer wall is detected by the temperature sensor A-2. The temperature sensors A-1 and A-2 are provided at different positions in the radial direction on the same cross section of the heating cylinder 11, and in the example shown in FIG. 2A, the temperature sensors A-1 and A-2 are provided. -2 is provided at a position opposite to the radial direction, that is, at a position 180 degrees apart.

  As shown in FIG. 2B, the temperature sensors A-1 and A-2 may be provided at the same position in the circumferential direction and shifted in the axial direction within the same heater region. In this case, the temperature sensor A-1 in the vicinity of the inner wall and the temperature sensor A-2 for detecting the temperature in the vicinity of the outer wall outside the inner wall are provided in the respective arrangement holes. As a result, since one temperature sensor can be arranged in one arrangement hole, assembly and maintenance of the temperature sensor are facilitated.

  Further, as shown in FIG. 2C, the temperature sensors A-1 and A-2 may be provided at the same position in the circumferential direction and at the same position in the axial direction. In this case, the temperature sensor A-1 in the vicinity of the inner wall and the temperature sensor A-2 for detecting the temperature in the vicinity of the outer wall outside the inner wall are provided in the same arrangement hole. As a result, the amount of heat transfer in the radial direction can be accurately detected, and the heat flux near the inner wall can be accurately grasped.

  As described above, in the present embodiment, a plurality of temperature sensors are provided in the same heater zone along the longitudinal direction of the injection nozzle 105 and the heating cylinder 11, and a plurality of temperatures are provided at different depths in the same cross section. A sensor is provided.

  As shown in FIG. 1, each set of temperature sensors (for example, A-1 and A-2) is connected to the controller 130. The controller 130 receives an input signal from each temperature sensor, performs a calculation based on the detected value, and outputs a calculation result as a manipulated variable in the form of a PWM signal, an analog signal, or the like. On the basis of the switches 302-1 to 302-6 that are turned on and off, and the power supply 303 that energizes the heaters h1 to h6 provided in the first to sixth zones Z1 to Z15 via the switches 302-1 to 302-6. And.

  The temperature control unit 301 is connected to a display input device (also simply referred to as a display device) 135 that displays a detection value from the temperature sensor and inputs a temperature set value to the temperature control unit 301. The display device 135 is preferably a display device, and can display a temperature setting screen as described below. Moreover, it is preferable that the display device 135 includes, for example, a key input unit for performing temperature setting values and display switching.

  The temperature control unit 301 performs a control calculation based on the difference between the detected temperature of the temperature sensors A-2 to F-2 and the set temperature, and uses the calculation result as an operation amount to set the heaters h1 to h1 of the zones Z1 to Z15. The data is output to the switches 302-1 to 302-6 provided corresponding to h6. In other words, the operation amount from the temperature control unit 301 is a signal that determines the on period of the switches 302-1 to 302-6, and represents the ratio of the time that the switches 302-1 to 302-6 are on. Control the duty. As a result, the energization time to the heaters h1 to h6 in the zones Z1 to Z15 is controlled, and the temperature at which the temperature sensors A-2 to F-2 of the injection nozzle 105 and the heating cylinder 11 are arranged is set. To be kept.

  The temperature sensors A-1 to F-2, G, the controller 130, and the display input device 135 shown in FIG. 1 constitute an injection molding machine monitoring device as will be described later. Although the monitoring device preferably includes the display input device 135, it is not always necessary to control the cold start prevention function. Here, the display device 135 is not necessarily a setting operation monitor of the injection molding machine, and may be a normal PC provided separately from the injection molding machine. Moreover, the central management apparatus which manages the operation state of a some injection molding machine may be sufficient.

  The central control device according to the present invention is not limited to the screw type injection molding machine as shown in FIG. 1, but a so-called prep plastic type injection in which a resin melted in advance is supplied to a cylinder and injected by a plunger. It can also be used in a molding machine.

  Next, a monitoring apparatus for an injection molding machine according to an embodiment of the present invention will be described. The following description explains an embodiment of the monitoring device for the injection molding machine described above. The heating cylinder 11 is divided into four regions Z1 to Z4, and the injection nozzle 105 at the tip of the heating cylinder 11 is divided into two regions Z5 and Z15, and a temperature sensor is provided in each zone. It shall be. However, in the present embodiment, such zoning is not necessarily required, and it is only necessary to provide temperature sensors in the vicinity of the outer wall and the inner wall at an appropriate position of the heating cylinder 11.

  First, melting of the resin in the heating cylinder 11 will be described with reference to FIG. FIG. 3 is a cross-sectional view schematically showing a part of the heating cylinder 11. A part of the heating cylinder 11 shown in FIG. 3 is a part in the zone Z1. The zone Z1 is in a region called a so-called feed zone (supply zone), and is a portion where the resin pellets 18 supplied from the resin supply port are heated by receiving heat from the heater h1.

  The resin pellet 18 is supplied between the flight 16 a of the screw 16 in the heating cylinder 11 and the inner wall of the heating cylinder 11, and the axial direction (the direction indicated by the left-pointing arrow in the drawing) by the movement of the flight 16 a accompanying the rotation of the screw 16. Moved to.

  When the heater h1 provided on the outer periphery of the heating cylinder 11 generates heat, the heat is transferred to the resin pellet 18 through the heating cylinder 11, and the resin pellet 16 is heated. Further, when the resin pellet 18 moves in the axial direction by the rotation of the screw and reaches the compression zone (compression zone), the resin pellet 18 is compressed due to the shallow groove. Due to the shearing of the resin pellets 18 due to the compression, the resin pellets 18 themselves generate heat, and the resin temperature rises. Therefore, when the resin pellet 18 moves in the axial direction of the heating cylinder 11 as the screw 16 rotates, the temperature of the resin pellet 18 exceeds the melting point by the shear heat and the heat from the heater, and the resin pellet 18 is melted. To do. At this time, in the space where the resin pellets 18 are supplied, a lump (solid head) of the resin pellets 18 before melting and a molten resin (melt pool) are mixed. When the resin pellet 18 further advances in the axial direction and moves to the metering zone (measurement zone), the resin pellet 18 is completely melted and the resin is measured.

  In the present embodiment, the temperature sensor A-1 is embedded in the vicinity of the inner wall of the heating cylinder 11, and the temperature sensor A-2 is embedded in the vicinity of the outer wall of the heating cylinder 11 at substantially the same position in the axial direction. The heat generated by the heater h1 is transmitted in the radial direction of the heating cylinder 11 to reach the internal resin pellet 18 and the resin pellet 18 is heated. Therefore, the temperature sensors A-1 and A-2 are arranged along a path along which the heat from the heater h1 moves through the resin pellets 18. Specifically, the heat generated in the heater h1 first passes through the position of the temperature sensor A-2 in the vicinity of the outer wall, moves in the heating cylinder 11 in the radial direction, and the temperature sensor A-1 in the vicinity of the inner wall. And reaches the resin pellet 18 in contact with the inner wall of the heating cylinder 11. Therefore, the value of the heat flux flowing from the vicinity of the outer wall of the heating cylinder 11 to the vicinity of the inner wall can be determined by determining the temperature difference at the positions of the temperature sensors A-2 and A-1. This heat flux corresponds to the amount of heat transferred to the resin pellets (or molten resin) in the heating cylinder 11. Thus, the heat flux flowing through the resin can be obtained based on the temperature detection values by the temperature sensors A-1 and A-2. By monitoring the heat flux thus obtained, it is possible to know the molten state (temperature) of the internal resin as will be described later.

  Here, the temperature change of the heating cylinder 11 when the injection molding machine starts the molding operation from the state where the molding operation is stopped will be described with reference to FIG. FIG. 4 is a diagram showing a temperature difference (temperature gradient) between the temperature near the inner wall and the temperature near the outer wall of the heating cylinder.

  Here, the heat flux that is the amount of heat passing through the unit area is used as the amount of heat transfer, but it may be monitored using the amount of heat. Furthermore, a temperature difference can be used as the amount of heat transfer.

  It is assumed that the heating cylinder is kept at 100 ° C. when the injection molding machine stops the molding operation. At this time, the temperature near the outer wall of the heating cylinder and the temperature near the inner wall are 100 ° C., and the temperature difference t 0 is zero. When the operation mode of the injection molding machine is set to the molding mode in order to start the molding operation, heating of the heating cylinder 11 by the heater is started. Although the temperature near the outer wall near the heater starts to rise rapidly, heat does not move immediately to the inner wall, so the temperature near the inner wall only rises slightly, and the temperature difference t1 is as small as about 20 ° C. .

  Here, in the molding mode, the temperature of the resin in the heating cylinder 11 is appropriately controlled by maintaining the heating cylinder 11 at 300 ° C. ± 20 ° C. When heating by the heater continues and the temperature near the outer wall exceeds 280 ° C., the temperature near the inner wall has not yet risen sufficiently, and the temperature difference t2 is about 80 ° C. This means that even if the temperature in the vicinity of the outer wall enters the temperature setting range during the molding operation, the resin temperature has not yet risen sufficiently, and it is necessary to wait until the resin temperature enters the temperature setting range. means.

  When the temperature near the outer wall falls within the temperature setting range, the output of the heater is controlled, and the temperature near the outer wall is maintained within the temperature setting range. When the entire heating cylinder 11 is warmed, the temperature near the inner wall rises, approaches the temperature near the outer wall, and enters the set temperature range. The temperature difference t3 at this time is about 20 ° C.

  As described above, when the temperature in the vicinity of the outer wall enters the temperature setting range, that is, when the temperature reaches the lower limit of the allowable value of the temperature setting range, the temperature of the resin has not yet sufficiently increased. The heating cylinder 11 must be continuously heated by the heater until the set temperature is reached. Here, when the temperature in the vicinity of the inner wall enters the set temperature range, the internal resin temperature has not yet reached the set temperature. That is, since there is a temperature difference between the temperature near the inner wall of the heating cylinder 11 and the temperature of the resin, the temperature near the inner wall and the temperature of the resin are not equal. This temperature difference varies depending on the type of resin inside, the resin filling state and the molten state. Therefore, even if the inner wall temperature falls within the set temperature range, the state of the resin is not accurately grasped, and an index that can accurately grasp the state of the resin is required.

  Therefore, in the present embodiment, the above-described heat flux is used as an index that can accurately grasp the state of the resin. By monitoring the heat flux of the heat flowing from the heating cylinder 11 to the resin, the amount of heat per unit time flowing from the heating cylinder to the resin can be grasped. Since the heat flux is proportional to the temperature difference, the temperature difference decreases as the heat flux decreases. Therefore, when the temperature in the vicinity of the inner wall of the heating cylinder 11 enters the set temperature range and the heat flux becomes a small value equal to or smaller than a predetermined threshold, the temperature of the internal resin is almost equal to the temperature in the vicinity of the inner wall of the heating cylinder 11. It can be determined that the target set temperature has been reached.

  The monitoring apparatus for an injection molding machine according to the present embodiment obtains a heat flux based on the detected value of the temperature sensor described above, and cancels the cold start prevention function when the obtained heat flux value becomes equal to or less than a threshold value. It is configured as follows. FIG. 5 is a graph showing the temporal change of heat flux as the amount of movement of heat flowing in the radial direction in the heating cylinder 11. When the heating cylinder 11 is heated by the heater from the heat retaining state or the room temperature state as described above, the heat flux flowing from the outer wall (heater) of the heating cylinder 11 to the inner wall (resin) exponentially with time. Decrease. When the temperature difference between the temperature in the vicinity of the inner wall of the heating cylinder 11 and the temperature of the internal resin is reduced, the amount of heat transfer is also reduced and the heat flux is reduced. Therefore, when the temperature difference between the temperature in the vicinity of the inner wall and the temperature of the internal resin is small and it can be determined that the temperature in the vicinity of the inner wall is substantially equal to the temperature of the resin, the value of the heat flux is set as a threshold, and the heat flux is When the threshold value is not reached, the cold start prevention function is canceled.

  The cold start prevention function is a function that prevents the molding operation from starting until the resin reaches a predetermined temperature, and is also referred to as a cold start interlock. For example, when the injection molding machine is not operated during a holiday, the molding mode is started from the state where the heating cylinder 11 is at room temperature or from the heat retention mode. Alternatively, when the injection molding machine is in the heat retention mode during the lunch break, the molding mode is started when the heating cylinder 11 is at the heat retention temperature. In such a case, the cold start interlock is applied in advance, and the molding operation cannot be started while the cold start interlock is applied. Therefore, it is necessary to release the cold start interlock to enter the molding operation.

  FIG. 6 is a flowchart of a process for releasing the cold start interlock when starting the operation of the injection molding machine. First, when the molding operation of the injection molding machine is stopped and the heat retention mode is set, the cold start interlock is automatically applied, and the cold start prevention function is set (step S1). Next, when the molding operation is resumed, when the molding mode is set, heating cylinder heating by the heater is started based on the set molding temperature (step S2).

  When the molding mode is set, the injection molding machine monitoring apparatus according to the present embodiment first determines whether or not the temperature detection value is equal to or higher than the set temperature (step S3). The temperature detection value is the temperature near the inner wall or the outer wall of the heating cylinder. The temperature near the outer wall is, for example, the temperature detected by the temperature sensor A-2, and the temperature near the inner wall is, for example, the temperature detected by the temperature sensor A-1. In step S3, if the detected temperature value is equal to or higher than the set temperature, it is next determined whether or not the heat flux value is equal to or lower than a threshold value (step S4). The heat flux is obtained from the temperature difference between the temperature near the outer wall and the temperature near the inner wall. And if the value of heat flux becomes below a threshold value, cold starting interlock will be canceled (Step S5). Thereby, a screw | thread can be started and a shaping | molding operation | movement can be started.

  In the above-described embodiment, it is first determined in step S3 whether the temperature detection value is equal to or higher than the set temperature. However, this determination is not necessarily required, and it is determined whether the heat flux is monitored to be equal to or lower than the threshold value. The cold start interlock may be released based on the above. That is, since the heat flux is small immediately after the molding mode is set, in order to avoid performing the determination in step S4 based on the heat flux at this time, based on the heat flux after the heating cylinder is heated to some extent. Therefore, it is determined whether the temperature detection value is equal to or higher than the set temperature. Therefore, for example, if the heat flux is compared with a threshold value after a certain period of time has elapsed since the start of heating (after the heat flux has become sufficiently large), whether or not the temperature detection value is equal to or higher than the set temperature. There is no need to judge.

  Further, if the capacity of the heating cylinder and the output of the heater are known, the temperature rise can also be known. Therefore, instead of monitoring the temperature near the outer wall in (Step 3), the time after the heater is turned on may be monitored.

  In addition, the position of the portion for obtaining the heat flux to be monitored to release the cold start interlock, that is, the position of the temperature sensor near the outer wall and the temperature sensor near the inner wall in the axial direction of the heating cylinder shall be an arbitrary position. However, it is preferably near the tip of the heating cylinder 11 or near the resin supply port. The vicinity of the tip of the heating cylinder 11 (zone Z4) is a portion where heating takes time because the cylinder is thick and the heat capacity is large. Therefore, the vicinity of the tip of the heating cylinder 11 (corresponding to the zone Z4) has a large difference between the temperature of the internal resin and the temperature of the cylinder, which is convenient for determining the molten state of the resin based on the value of heat flux. Part. Further, the vicinity of the resin supply port of the heating cylinder 11 (corresponding to the zone Z1) is a portion where the resin before melting is softened, and is a portion where a shearing force acts on the resin by a screw. Therefore, it is a convenient part for judging the state of the resin based on the temperature (degree of softening) of the resin in this part.

  As described above, the monitoring apparatus for the injection molding machine according to the present embodiment releases the cold start interlock based on the heat flux in the heating cylinder 11, so that the state closer to the actual state of the resin in the heating cylinder 11 is obtained. The cold start interlock can be released with accurate timing. Therefore, the timing for releasing the cold start interlock is delayed, the resin temperature does not rise too much, and resin burns do not occur, and useless heater power is not consumed. In addition, it is possible to prevent the screw from being damaged due to the cold start without causing an excessive torque to be applied to the screw because the timing for releasing the cold start interlock is too early.

It is a figure which shows the whole structure of the monitoring apparatus of the injection molding machine by one Embodiment of this invention. It is a figure which shows the position of the temperature sensor in a heating cylinder. It is sectional drawing which shows a part of heating cylinder typically. It is a figure which shows the temperature difference between the temperature of the inner wall vicinity of a heating cylinder, and the temperature of the outer wall vicinity. It is a graph which shows the time change of a heat flux. It is a flowchart of the process for canceling | releasing cold start interlock when starting operation | movement of an injection molding machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Injection device 11 Heating cylinder 12 Hopper 14 Cooling cylinder 16 Screw 16a Flight 18 Resin pellet 105 Injection nozzle h1-h6 Heater A1-F2, G Temperature sensor Z1-Z5, Z15 Zone 130 Controller 135 Display input device 301 Temperature control part 302- 1-302-6 Switch 303 Power supply

Claims (5)

A monitoring device for an injection molding machine,
A monitoring apparatus for an injection molding machine, wherein the cold start prevention function is canceled when a movement amount of heat from the vicinity of the outer wall of the heating cylinder toward the vicinity of the inner wall becomes a threshold value or less at a predetermined position of the heating cylinder. A monitoring device for an injection molding machine according to claim 1,
A monitoring device for an injection molding machine, wherein the cold start prevention function is canceled when the temperature in the vicinity of the outer wall of the heating cylinder is equal to or higher than a predetermined temperature. A monitoring device for an injection molding machine according to claim 2,
Furthermore, the monitoring apparatus for an injection molding machine, wherein the cold start prevention function is canceled in a state where the molding mode is turned on. A monitoring device for an injection molding machine according to claim 1,
A monitoring device for an injection molding machine, wherein temperature sensors are provided in the vicinity of an outer wall and an inner wall of the heating cylinder, and the amount of movement of the heat is obtained based on a temperature detection value by the temperature sensor. A monitoring device for an injection molding machine according to claim 1,
The monitoring apparatus for an injection molding machine, wherein the predetermined position of the heating cylinder is either near a resin supply port or near a tip.

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