KR20230122536A - controller for injection molding machine with counting and self-test function - Google Patents

Abstract

The posted content relates to a controller for an injection molding machine having a counting and self-diagnosis function for counting the number of molded products injected by a mold and checking and managing a venting gap (mold gap) between a fixed mold and a movable mold,
A controller for an injection molding machine having a counting and self-diagnosis function according to an embodiment of the present specification
Applied to an injection molding machine including a fixed mold, a movable mold molded with the fixed mold and forming a cavity into which molten resin is injected, and a gas discharger for discharging gas including air inside the cavity to the outside during injection molding, ,
a case mounted on one side of an outer surface of one of the fixed mold and the movable mold and having a display unit for displaying the number of injection-molded products;
a detection sensor for detecting the elevation of the movable mold relative to the fixed mold and detecting the quantity of the injected product;
It is energized and accommodated in the case by being energized to the detection sensor, and the mold gap between the fixed mold and the movable mold is measured by the detection sensor, but if the measured value of the mold gap exceeds an arbitrarily set value, a remote location It provides a controller for an injection molding machine having a counting and self-diagnosis function, characterized in that it includes a;

Description

Controller for injection molding machine with counting and self-test function {controller for molding injection machine with counting and self-test function}

The present specification relates to a controller for an injection molding machine, and more specifically, counting the number of molded products to be injection molded by a mold and checking and managing a venting gap (mold gap) between a fixed mold and a movable mold Counting and It relates to a controller for an injection molding machine having a self-diagnosis function.

Unless otherwise indicated herein, material described in this section is not prior art to the claims in this application, and inclusion in this section is not an admission that it is prior art.

In an injection molding mold, a slight venting gap is given between a parting line where a fixed mold and a movable mold around the cavity meet each other to discharge gas in the cavity, that is, gas including air. A vent groove is processed around the outside of the gap to allow air and gas to be discharged.

If the venting gap between the above-mentioned fixed mold and movable mold is increased, burr (referring to an additional skin formed around the molded article along the parting line) will occur more often in the molded product, and the molded product must be reprocessed after injection molding. And, there is a problem that causes waste of synthetic resin.

Conventionally, there is no automated system for the overall management of molds, so in order to determine the number of times molds are used, statistics of numbers written by hand at the work site are relied on, making it difficult to accurately measure the number of molds used in real time. there was

For this reason, in the case of injection molding of injection products using molds, it is necessary to determine the number of injection products produced according to the number of movements of the movable mold, check the amount of work that can be injected per day, or check the cycle time of injection products. For this, a separate counter is installed in the mold.

Republic of Korea Patent Publication No. 10-2020-0122485 (published on October 28, 2020) discloses a failure diagnosis device for an injection molding machine and a failure diagnosis method for an injection molding machine.

The embodiment of the present specification counts the number of molded products to be injection molded, checks the daily amount of work, and has a self-diagnosis function to check and manage the mold gap between the fixed mold and the movable mold, thereby preventing defects in the injected product due to aging of the mold. It relates to a controller for an injection molding machine having a counting and self-diagnosis function to prevent molding.

In the embodiment of the present specification, injection condition data is transmitted in real time to a manager's mobile terminal at a remote location so that the reliability of mold operation can be increased by maintaining optimal injection conditions in response to mold deterioration and error occurrence, counting and It is related to a controller for an injection molding machine having a self-diagnosis function.

An embodiment of the present specification relates to a controller for an injection molding machine having a counting and self-diagnosis function, which manages an injection molding machine from a remote location without arranging a manager around the injection molding machine, thereby reducing labor costs and facilitating production management of the injection molding machine. related

According to one embodiment of the present specification in order to achieve the above and other objects of the present specification,

Applied to an injection molding machine including a fixed mold, a movable mold molded with the fixed mold and forming a cavity into which molten resin is injected, and a gas discharger for discharging gas including air inside the cavity to the outside during injection molding, ,

a case mounted on one side of an outer surface of one of the fixed mold and the movable mold and having a display unit for displaying the number of injection-molded products;

a detection sensor for detecting the elevation of the movable mold relative to the fixed mold and detecting the number of injection products;

It is energized and accommodated in the case by being energized to the detection sensor, and the mold gap between the fixed mold and the movable mold is measured by the detection sensor, but if the measured value of the mold gap exceeds an arbitrarily set value, a remote location Provides a controller for an injection molding machine having a counting and self-diagnosis function, characterized in that it includes a;

According to a more preferred embodiment, the control unit

Operating the injection molding machine by applying power to the power supply unit;

setting arbitrary injection conditions for molding an injection product by the injection molding machine;

Molding an injection product according to the set injection conditions;

Counting the number of injection-molded products produced by a detection sensor that senses that the movable mold is lifted relative to the fixed mold, storing the measured production quantity in a storage unit, and displaying the measured number in a display unit;

comparing a measured value of the mold clearance by the detection sensor with an arbitrary set value in the step of molding the injection-molded product;

displaying an error on the display unit and transmitting injection condition data to a remote manager terminal in real time when the measured value of the mold clearance exceeds a set value;

and controlling the injection molding machine so that a manager checks injection condition data from a remote location and produces an injection molding product according to the reset injection condition applied to the injection molding machine.

The detection sensor is characterized in that a non-contact type photosensor composed of a light emitting element and a light receiving element is used.

The detection sensor

a contact limit switch for detecting the elevation of the movable mold relative to the fixed mold and detecting the number of injection-molded products;

and a non-contact mold holding pressure gap measuring sensor for measuring a mold gap between the fixed mold and the movable mold when the movable mold is molded to the fixed mold and injected.

The contact type limit switch

a piston housing formed to be movable in an axial direction on one side of an outer surface of the case and having a chamber formed therein;

an expansion piston that presses the contact-type limit switch as the piston housing is moved in an axial direction by an external force and slides by a predetermined stroke within the chamber to switch the contact-type limit switch to an operating mode;

a first elastic member accommodated in the chamber and returning the piston housing to an initial position by an elastic restoring force when an external force pressing the piston housing is removed;

It is installed between the contact-type limit switch and the extension piston, and when the external force pressing the piston housing is removed, the contact-type limit switch is maintained in a stop mode by pressing the extension piston in a direction away from the contact-type limit switch. It is characterized in that it further comprises; a second elastic member for.

In order to convert the contact-type limit switch from a stop mode to an operating mode, the piston housing is pressurized to increase the contact stroke of the contact-type limit switch by 3.5 mm so that the contact point of the contact-type limit switch is turned on. characterized by one.

The controller for an injection molding machine having a counting and self-diagnosis function according to an embodiment of the present specification having the above configuration has the following advantages.

By counting the number of injection molded products, checking the daily work load, and having a self-diagnosis function that checks and manages the mold gap between the fixed mold and the movable mold, it prevents poor molding of the injection product due to aging of the mold, thereby improving quality and quality. productivity can be improved.

In addition, when measuring mold gaps that are out of the allowable range of injection conditions, information is transmitted in real time to the manager's mobile terminal in a remote location, so that abnormal signs and errors due to aging of the mold can be detected immediately against defective injection products and malfunctions of the injection molding machine in response to errors. can be identified and acted on.

In addition, it is possible to reduce labor costs and facilitate injection product production management by managing the injection molding machine from a remote location without a manager residing in the injection molding workshop.

1 is a perspective view of a controller for an injection molding machine having a counting and self-diagnosis function according to a preferred embodiment of the present specification;
Figure 2 is an exploded perspective view of the controller shown in Figure 1;
3 is a view of a state in which the upper case is separated from the controller shown in FIG. 1;
4 is a flowchart showing the steps of controlling the injection molding apparatus in the controller shown in FIG. 1;
5 is a use state diagram in which the controller shown in FIG. 1 is mounted at an arbitrary position in the mold;
6 is a cross-sectional view of a limit switch mounted on the controller shown in FIG. 1;
7 is a view showing a mold counter in the controller shown in FIG. 1;
FIG. 8 is a view showing a mold holding pressure gap measuring device in the controller shown in FIG. 1 .

Hereinafter, a controller for an injection molding machine having a counting and self-diagnosis function according to a preferred embodiment of the present specification will be described in detail with reference to the accompanying drawings.

1 to 8, a controller (A) for an injection molding machine having a counting and self-diagnosis function according to an embodiment of the present specification

A fixed mold 10, a movable mold 20 in which a cavity (not shown) is formed that is molded with the fixed mold 10 and into which a molten synthetic resin is injected, and the fixed mold 10 and the movable mold 20 ) Is formed on at least one side of the injection molding machine 100 including a gas discharger (not shown) for discharging gas including air in the cavity to the outside during injection molding,

A lower case 40 mounted on one side of the outer surface of either the fixed mold 10 or the movable mold 20, having a display unit 30 for displaying the quantity of injection-molded products, and mounted on the mold. And a case 60 formed of an upper case 50 detachably coupled to the lower case 40;

A detection sensor 70 for detecting the elevation of the movable mold 20 relative to the fixed mold 10 and detecting the number of injection products;

It is energized to the detection sensor 70 and accommodated in the case 60, and the mold gap 80 between the fixed mold 10 and the movable mold 20 by the detection sensor 70 (the so-called putting gap) Say) (as an example, about 0.3 to 0.5 mm) is measured, but if the measured value of the mold gap 80 exceeds an arbitrarily set value (the amount of burrs in the injection molded product increases, so the molded product after injection molding It is characterized in that it includes a control unit 90 (PCB) for checking and managing the aging of the mold and injection conditions by transmitting injection condition data to a remote manager in real time.

The above-described injection conditions of the injection molding machine 100 refer to conditions for molding an injection product, that is, processing temperature, mold temperature, injection pressure, injection time, injection speed, cooling time, and the like.

According to a more preferred embodiment, as shown in FIG. 4, the above-described controller 90

Applying power to the power supply unit and setting the injection conditions of the injection molding machine 100, but applying and controlling a signal to the controller 90 according to the set injection conditions to operate the injection molding machine 100 (see S10) ( That is, the control unit 90 controls the injection molding machine 100 to be driven by receiving data signals according to injection conditions and applying a signal to a power supply unit (not shown) of the injection molding machine 100);

A step of setting arbitrary injection conditions for molding a predetermined injection product by the injection molding machine 100 (see S20) (pre-set data in the control unit 90 or from a manager terminal at a remote location to the control unit 90 by the communication unit) set according to the applied control signal);

Move to the step of setting the injection conditions (see S30) (ie, the control unit 90 determines whether the injection conditions have been applied to the injection molding machine 100, but if the injection condition settings have not been completed, see S20), and the settings are made again. and, when it is determined that the setting of the injection conditions is completed, the step of producing a predetermined injection product through the injection molding machine 100 (see S40) is performed;

molding (producing) a predetermined injection molding product in the injection molding machine 100 according to set injection conditions (see S40);

Counting the production quantity of the injected product by the detection sensor 70 that detects the elevation of the movable mold 20 relative to the fixed mold 10 (see S50), stores the measured production quantity in the storage unit, and displays the display unit 30 Marking step (see S60) (when production is completed according to the quantity of injection molding machine 100, the injection conditions are stored in the storage unit);

Comparing the measured value of the mold gap 80 by the detection sensor 70 with an arbitrary set value in the step of molding the injection product (see S70);

If the measured value of the mold gap 30 exceeds the set value, an error is displayed on the display unit 30 so that the operator can check it at the injection site, and the injection condition data is transmitted to the remote manager terminal in real time by the communication unit. Transmitting (see S80);

and controlling the injection molding machine 100 to produce an injection product according to the reset injection condition applied to the injection molding machine 100 by a manager checking the injection condition data from a remote location (see S90); .

The above-described detection sensor 70 is a non-contact type photosensor composed of a light emitting element and a light receiving element, or a proximity sensor (as an example, an inductive sensor, a capacitive sensor, an ultrasonic sensor, etc. may be used, but is not meant to be limited thereto) can be used

At this time, the non-contact detection sensor 70 is not limited to these, and another type of detection sensor including a contact type may be used, and since it is commonly used in the technical field to which this specification belongs, a detailed description of their configuration and use method is omitted.

In the drawing, reference numeral 110 denotes a replaceable or rechargeable battery for applying power to the control unit 90 .

The aforementioned detection sensor 70

a contact limit switch 120 for detecting the elevation of the movable mold 20 relative to the fixed mold 10 and detecting the number of injection-molded products (see FIG. 7);

A non-contact mold holding pressure gap measurement sensor for measuring the mold gap 80 between the fixed mold 10 and the movable mold 20 during injection by molding (combining) the movable mold 20 with the fixed mold 10 ( 130) (see FIG. 8).

At this time, the communication frequency can be changed and applied for each country, and the frequency is periodically emitted so that the location of the currently stored mold can be identified based on the communication data.

On the other hand, the contact-type limit switch 120 for detecting the elevation of the movable mold 20 relative to the fixed mold 10 is switched from a stop mode to an operating mode when receiving external pressure (operating state), so that other devices are powered ( power) can be supplied.

Cycle time measurement of the cycle time from the time when the contact-type limit switch 120 is converted to the operation mode until the contact-type limit switch 120 receives external pressure again (operating state) and switches to the operation mode It is measured by the unit (a), and the measured data is transmitted to the mold management server or terminal (gateway) by the communication unit (b).

When the above-mentioned contact type limit switch 120 receives external pressure (operating state), the counter for the number of times external pressure is received is measured by the counting unit ("c" in FIG. 7) and stored in the memory, but the communication unit (Fig. By "b") of 7, it is transmitted to the mold management server or terminal (gateway).

On the other hand, when injection molding is performed by molding the movable mold 20 to the fixed mold 10, the gap between the mold gap 80 between the fixed mold 10 and the movable mold 20 is a non-contact mold holding pressure gap measurement sensor ( 130) to determine whether the mold injection quality is good or not.

At this time, the measurement data for the mold gap 80 is transmitted to the mold management server or terminal (gateway) through the communication unit (b). It operates from the point when the power is turned on, and when the measured value of the mold holding pressure gap becomes constant and no further measurement is required, it switches to the stop mode.

As shown in FIG. 6, the aforementioned contact type limit switch 120

A piston housing 140 formed to be movable in an axial direction on one side of an outer surface of the case 60 and having a chamber 140a formed therein;

As the piston housing 140 moves in the axial direction by the external force P and slides by a predetermined stroke within the chamber 130, the contact-type limit switch 120 is pressed and the contact-type limit switch ( an expansion piston 150 that converts 120 into an operating mode;

A first elastic member 160 accommodated in the chamber 130 and returning the piston housing 140 to an initial position by an elastic restoring force when the external force P pressing the piston housing 140 is removed (as an example). , compression coil springs may be used);

It is installed between the contact-type limit switch 120 and the extension piston 150, and when the external force P that pressurizes the piston housing 140 is removed, the extension piston 150 moves away from the contact-type limit switch 120. and a second elastic member 170 (for example, a compression coil spring may be used) for maintaining the stop mode of the contact type limit switch 120 by pressing.

For this reason, the piston housing 140 is moved in the axial direction (of the case 60) by the external force P applied when the mold is closed for injection molding by molding the movable mold 20 to the fixed mold 10 described above. inward direction).

When the piston housing 140 is pressurized by the external force P, the first elastic member 160 accommodated in the chamber 140a of the piston housing 140 receives a compressive force. As a result, the expansion piston 150 slidably accommodated in the chamber 140a slides leftward in the drawing of FIG. 6 .

Due to the above-described sliding movement of the expansion piston 150, the outer end of the contact-type limit switch 120 accommodated in the case 60 is pressed, thereby operating the contact-type limit switch 120 in an ON state.

As described above, the piston housing by an external force (P) to switch the contact type limit switch 120 from a power sleep mode, standby mode, stop mode to an ON work mode. When the 140 is pressurized, the first elastic member 160 accommodated in the chamber 140a is pressurized when the piston housing 140 moves.

Therefore, when the mold is closed for injection molding, the first elastic member 160 pressurizes the piston housing 140 by the external force P to press the contact limit switch 120 to the ON state. The expansion piston 150, to which the external force P is transmitted through the sliding movement, presses the outer end of the contact type limit switch 120. At this time, the stroke of the piston housing 140 elastically supported by the first elastic member 160 can be increased by 3.5 mm.

Therefore, as the contact stroke of the contact type limit switch 120 is increased by the movement of the piston housing 140, the contact type limit switch 120 can be accurately contacted in the ON state (see FIG. 6). .

On the other hand, when the mold is closed for conventional injection molding, the contact stroke for pressing the contact limit switch 120 in the ON state is up to 1.5 mm (see FIG. 6), and the contact limit switch ( 120) is insufficient to switch to the ON state, resulting in a decrease in reliability of the detection value of the detection sensor 70.

As described above, it includes a fixed mold 10 and a movable mold 20 that is raised and lowered relative to the fixed mold 20 when a normal driving means (not shown) is driven and molded (coupled or separated), and the fixed mold ( 10) and the movable mold 20 by injecting a molten resin through a gate (not shown) into a cavity formed when molding and then curing the injection molding machine 100 (ie, the control unit 90 Since the injection molding operation is performed according to the setting of the injection conditions by the control signal applied from ) is applied substantially the same as that commonly used in the technical field to which this specification belongs, a detailed description of their configuration and operation omit

Hereinafter, an example of use of the controller (A) for an injection molding machine having a counting and self-diagnosis function according to an embodiment of the present specification will be described.

As shown in FIGS. 1 to 8 , the above-described controller 90 controls power supply, data storage, program storage, product take-out control and quantity control, temperature, mold temperature, injection pressure, injection time, injection speed, and cooling time. It becomes possible to control the setting control and communication to set (injection conditions).

Although not shown in the drawings, the above-described control unit 90 stores and programs data according to the settings of the injection conditions of the injection molding machine 100, that is, processing temperature, mold temperature, injection pressure, injection time, injection speed, cooling time, etc. This is stored, and the above-described program may include a storage unit (not shown) for displaying the program in a specific format on the display unit 30 under the control of the control unit 90 .

The above-described control unit 90 controls conditions for producing the injection molding machine 100, that is, processing temperature, mold temperature, injection pressure, injection time, injection speed, and cooling time through the display unit 30. It may include a setting unit (not shown) that allows settings to be made. At this time, the setting unit applies the data according to the injection conditions set in the display unit 30 to the control unit 90, and the control unit 90 stores them in a storage unit (not shown).

The above-described detection sensor 70 grasps the take-out and quantity of injection products produced in the injection molding machine 100 according to the injection conditions, and the data for this is applied to the controller 90, which controls the injection products Data on the extraction and quantity of is stored in a storage unit (terminal) (not shown).

If the measured value of the mold gap 80 detected by the above-described detection sensor 70 is compared with an arbitrarily set set value, but the measured value of the mold gap 80 is greater than the set value (i.e., the measured value > the set value) , Check whether or not an error has occurred, such as the operation of the injection molding machine 100 and the injection conditions, apply this to the control unit 90 to display an error on the display unit 30, and also display an error on the remote manager terminal through a common communication network (That is, it refers to a communication unit capable of applying a data signal applied through an Internet terminal and a Wi-Fi router through a communication network to the control unit 90) and transmits in real time.

Here, although the above specification has been described with reference to preferred embodiments, those skilled in the art will variously modify and modify this specification within the scope not departing from the spirit and scope of the present specification described in the claims below. You will understand that you can change.

10; fixed mold
20; movable mold
30; display part
40; lower case
50; upper case
60; case
70; detection sensor
80; mold gap
90; Control (PCB)
100; injection molding machine
110; battery
120; contact type limit switch
130; Non-contact mold holding pressure gap measurement sensor
140; piston housing
140a; chamber
150; extension piston
160; First elastic member
170; Second elastic member
A; controller

Claims (6)

Applied to an injection molding machine including a fixed mold, a movable mold molded with the fixed mold and forming a cavity into which molten resin is injected, and a gas discharger for discharging gas including air inside the cavity to the outside during injection molding, ,
a case mounted on one side of an outer surface of one of the fixed mold and the movable mold and having a display unit for displaying the number of injection-molded products;
a detection sensor for detecting the elevation of the movable mold relative to the fixed mold and detecting the quantity of the injected product;
It is energized to the detection sensor, accommodated in the case, and measures the mold gap between the fixed mold and the movable mold by the detection sensor. A controller for an injection molding machine having a counting and self-diagnosis function, characterized in that it comprises a; According to claim 1,
The control unit
Operating the injection molding machine by applying power to the power supply unit;
setting arbitrary injection conditions for molding an injection product by the injection molding machine;
Molding an injection product according to the set injection conditions;
counting the number of injection-molded products produced by a detection sensor that detects that the movable mold is lifted relative to the fixed mold, and displaying the measured production quantity on a display unit;
comparing a measured value of the mold clearance by the detection sensor with an arbitrary set value in the step of molding the injection-molded product;
displaying an error on the display unit and transmitting injection condition data to a remote manager terminal in real time when the measured value of the mold clearance exceeds a set value;
Controlling the injection molding machine so that a manager at a remote location checks the injection condition data and produces an injection molding product according to the reset injection condition applied to the injection molding machine; Controller for molding machine. According to claim 1 or 2,
The detection sensor is a controller for an injection molding machine having a counting and self-diagnosis function, characterized in that a non-contact photosensor consisting of a light emitting element and a light receiving element is used. According to claim 1,
The detection sensor
a contact limit switch for detecting the elevation of the movable mold relative to the fixed mold and detecting the number of injection-molded products;
Injection with counting and self-diagnosis function comprising a; non-contact type mold holding pressure gap measuring sensor for measuring the mold gap between the fixed mold and the movable mold during injection by molding the movable mold with respect to the fixed mold Controller for molding machine. According to claim 4,
The contact type limit switch
a piston housing formed to be movable in an axial direction on one side of an outer surface of the case and having a chamber formed therein;
an expansion piston that presses the contact-type limit switch as the piston housing is moved in an axial direction by an external force and slides by a predetermined stroke within the chamber to switch the contact-type limit switch to an operating mode;
a first elastic member accommodated in the chamber and returning the housing to an initial position by an elastic restoring force when an external force pressing the piston housing is removed;
It is installed between the contact-type limit switch and the extension piston, and when the external force pressing the piston housing is removed, the contact-type limit switch is maintained in a stop mode by pressing the extension piston in a direction away from the contact-type limit switch. A controller for an injection molding machine having a counting and self-diagnosis function, characterized in that it further comprises a second elastic member for doing so. According to claim 5,
In order to convert the contact-type limit switch from a stop mode to an operating mode, the piston housing is pressurized to increase the contact stroke of the contact-type limit switch by 3.5 mm so that the contact point of the contact-type limit switch is turned on. A controller for an injection molding machine having a counting and self-diagnosis function, characterized in that.

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