JP4320747B2 - Automatic lubrication apparatus and automatic lubrication method for injection molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic lubrication apparatus and an automatic lubrication method for an injection molding machine that automatically supplies lubricating oil such as grease to a sliding part, a rotating part, etc. (hereinafter referred to as an oil supply part) of an injection molding machine.
[0002]
[Prior art]
In an injection molding machine equipped with a mold clamping device and an injection device, for example, as shown in FIG. 2, the joint portion of the toggle mechanism 21, the sliding portion of the movable platen 23 slidably supported by the tie rod 22, etc. Each of the grease nipples 24 is provided, and the grease pump 26 is driven by the drive unit 25, whereby the grease is sent to each grease nipple 24 through the distributor 27 and the tube 28 to lubricate each oil supply location. This refueling is generally performed at regular time intervals.
[0003]
However, on the sliding surface and rotating surface of the machine, as time passes, many fine irregularities that existed in the initial stage of operation are reduced by so-called “familiarity”, and there is a tendency that sliding and rotation become smooth. For this reason, if lubrication is performed at regular intervals as described above, lubrication is insufficient immediately after the start of use of the machine, and it is easy to abnormally wear the lubricated part. There are inconveniences such as the molded product being easily contaminated with lubricating oil.
[0004]
Therefore, in the electric injection molding machine of FIG. 2, the grease pump 26 is automatically operated by detecting insufficient lubrication from the error voltage of the servo motor 29 that operates the toggle mechanism 21 or the servo motor 30 for adjusting the mold thickness. (JP-A-3-79325).
[0005]
Also proposed is an injection molding machine that measures the mold opening and closing time of the mold clamping device and supplies lubricating oil to each oil supply location of the mold clamping device when the measurement result becomes longer than a preset time. (JP-A-8-207108).
[0006]
[Problems to be solved by the invention]
However, the former method of monitoring the error voltage of the servo motor cannot be applied to a hydraulic injection molding machine that does not use the servo motor. In addition, the resistance of the operating portion such as sliding and rotating greatly varies depending on the operating conditions (load, temperature, speed, etc.), and thus there is a problem that it is difficult to know an appropriate oiling timing.
[0007]
Further, the latter method of determining the oil supply timing by monitoring the mold opening / closing time does not function in an electric injection molding machine in which the operation speed is unlikely to change even if the operation resistance such as sliding or rotation increases. In addition, since the resistance of the operating portion varies greatly depending on the operating conditions as described above, it cannot be said that proper oil supply is obtained even if the oil supply timing is determined based on information such as the load, temperature, and speed.
[0008]
An object of the present invention is to provide an automatic lubrication apparatus and an automatic lubrication method for an injection molding machine that can always properly lubricate a lubrication point corresponding to the operation time of the injection molding machine.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is an automatic lubrication device of an injection molding machine that supplies lubricating oil such as grease to a supply location of an injection molding machine with a lubrication device. A plurality of refueling interval setting devices for setting different operating element values of the injection molding machine, a switching device for switching between the plurality of refueling interval setting devices, an operation amount setting device for setting the operation amount of the injection molding machine, and the operation Compares the set operating amount set in the volume setting device with the actual actual operating amount of the injection molding machine, outputs a signal when the actual operating amount reaches the set operating amount, and supplies another oil supply interval setter to the switch to the switching comparator to switch, the switching device of any one of the plurality of oil supply interval setter for switching the connection by setting the interval element value and the actual injection molding machine Comparing the number of intervals element, the outputs a signal when the configuration interval element value of the number of real intervals element reaches has a structure provided with the comparator for an interval element for operating the fuel supply device.
[0010]
In this means, different interval element values of the injection molding machine are set in each oil supply interval setting device, and the operation amount such as the operation time of the injection molding machine and the number of shots is set in the operation amount setting device. Start machine operation. When the actual number of interval elements of the injection molding machine reaches the set interval element value set in the first refueling interval setter connected to the interval element comparator by the switch, a signal is sent from the interval element comparator. The oil supply device is actuated to operate and supply lubricating oil to each oil supply location of the injection molding machine.
[0011]
When the actual operating amount of the injection molding machine reaches the set operating amount set in the operating amount setter, the switch operates by the output signal from the switching comparator, and other oil supply interval setting devices are Connect to the element comparator. Thereafter, the oil supply device lubricates the oil supply location with the set interval element value set in the second oil supply interval setting device.
[0012]
Therefore, according to this means, it is possible to always optimally lubricate the oil supply location according to the state of the oil supply location of the injection molding machine that changes over time.
[0013]
In the automatic lubrication device of the above injection molding machine, the lubrication time setter for setting the lubrication time of the lubrication device is compared with the set lubrication time set in the lubrication time setter and the actual actual lubrication time of the lubrication device. When the actual oiling time reaches the set oiling time, the oiling comparator may be provided to output a signal and stop the oiling device (claim 2).
[0014]
In this configuration, when the time set in the refueling time setting device has elapsed, a signal is output from the refueling comparator, and the refueling device stops refueling. Therefore, the fueling device can be stopped at the end of fueling at the longest time among the plurality of fueling points.
[0015]
In the above automatic lubrication apparatus, the interval element value set in the oil supply interval setting device can be set to the number of shots or the operating time of the injection molding machine (Claim 3), and set in the operation amount setting device. The operating amount of the injection molding machine can be the operating time or the number of shots.
In either case, the interval element value and the operation amount can be set accurately.
[0016]
According to a fifth aspect of the present invention, in the automatic lubrication apparatus for an injection molding machine according to any one of the first to fourth aspects, one refueling interval setting device connected to the interval element comparator first by a switching device Set the interval element values so that the oiling interval of the injection molding machine will be shorter than the oiling interval of other oiling interval setting devices connected to the interval element comparator with a switch later. It was set as the structure which lubricates.
[0017]
With this means, a large amount of lubricating oil is supplied to the oil supply location at the beginning of use of the injection molding machine, and the supply amount of the lubricating oil automatically decreases when the oil supply location becomes familiar.
[0018]
According to a sixth aspect of the present invention, in the automatic lubrication apparatus for an injection molding machine according to any one of the first to fourth aspects, the injection element is set by setting different types of interval element values in the plurality of fuel supply interval setting devices. The lubrication part of the machine was lubricated.
With this means, it is possible to freely select the type of interval element value that best suits the operation amount of the injection molding machine.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG.
In FIG. 1, reference numeral 1 denotes an injection molding machine. The injection molding machine 1 has a mold clamping device 2 and an injection device 3 as is well known. There are various types of injection molding machines 1 such as electric type and hydraulic type. In the present invention, the type and structure of the injection molding machine 1 (the mold clamping device 2 and the injection device 3) are arbitrary.
[0020]
Reference numeral 5 denotes an automatic lubricating device. The automatic lubrication device 5 includes an oil supply device 6, an oil supply interval setting device 7, 8, a switching device 9, an operation amount setting device 10, a switching comparator 11, an interval element comparator 12, an oil supply time setting device 13, and an oil supply device And a comparator 14.
[0021]
In the oil supply device 6, for example, lubricating oil such as grease is predetermined in oil supply locations such as a joint portion of the toggle mechanism of the mold clamping device 2, a sliding portion of the movable plate, or a sliding portion of the injection device 3 with respect to the bed. Usually, it is configured by a lubricating oil pump that pumps lubricating oil, a lubricating oil tank, a distribution valve that distributes a predetermined amount of lubricating oil to each oil supply location via a pipe, and the like.
[0022]
The oil supply interval setting units 7 and 8 set the oil supply interval of the oil supply device 6 according to the number of interval elements such as the total number of shots and the total operation time of the injection molding machine 1. It is designed to be connected alternatively.
[0023]
The operation amount setting unit 10 sets operation amounts such as the total operation time and the total number of shots of the injection molding machine 1 and is connected to the switching comparator 11. The switching comparator 11 compares the set operation amount set in the operation amount setting device 10 with the actual actual operation amount of the injection molding machine 1, and outputs a signal when the actual operation amount reaches the set operation amount. Then, the switch 9 is operated, and the oil supply interval setting device 7 that has been connected to the interval element comparator 12 is disconnected from the interval element comparator 12, and the other oil supply interval setting device 8 is connected to the interval element comparator. 12 is connected.
[0024]
The interval element comparator 12 compares the set interval element values of the oil supply interval setting units 7 and 8 connected to itself by the switch 9 with the actual number of actual interval elements of the injection molding machine 1, and sets the set interval. When the number of actual interval elements reaches the element value, a signal is output to operate the fueling device 6 and is connected to the fueling comparator 14.
[0025]
The oil supply time setting unit 13 sets the oil supply time of the oil supply device 6 and is connected to the oil supply comparator 14. The oiling comparator 14 compares the set oiling time set in the oiling time setting unit 13 with the actual oiling time of the oiling device 6 and outputs a signal when the actual oiling time reaches the set oiling time. The device 6 is stopped, and is connected to the oil supply device 6.
[0026]
The switching comparator 11 and the interval element comparator 12 are connected to the injection molding machine 1, and receive the actual operation amount and the actual interval element number from the injection molding machine 1, respectively.
[0027]
Next, the operation of the automatic lubrication device for an injection molding machine according to the present invention having the above-described configuration is applied to, for example, the lubrication interval setting devices 7 and 8 as the lubrication interval element value by the number of shots “3000 times” of the injection molding machine 1. ”And“ 10000 times ”, respectively, and the operation amount setting unit 10 sets the operation time“ 500 hours ”of the injection molding machine 1 as the operation amount, and the oil supply time setter 13 sets the oil supply time“ 3 ”. A case where “minute” is set will be described.
[0028]
When the operation of the injection molding machine 1 is started, the interval element comparator 12 compares the set interval element value of the refueling interval setting unit 7, that is, “3000 times” with the actual shot number of the injection molding machine 1, When the actual number of shots reaches “3000 times”, a signal is output to operate the fueling device 6. At the same time when the oil supply device 6 is operated, the oil supply comparator 14 is operated to compare the set time “3 minutes” of the oil supply time setting device 13 with the operation time of the oil supply device 6, and when 3 minutes have elapsed, a signal is output and the oil supply device 6 is stopped. Eventually, the fueling device 6 operates for 3 minutes every 3000 shots (25 hours if the cycle time of one shot is 30 seconds) to lubricate the fueling location of the injection molding machine 1.
[0029]
On the other hand, the switching comparator 11 compares the set operation amount of the operation amount setting unit 10, that is, “500 hours” with the actual operation time of the injection molding machine 1 at the same time when the operation is started. When the operation time reaches 500 hours, a signal is output to operate the switch 9, the connection of the fueling interval setting unit 7 to the interval element comparator 12 is disconnected, and the next fueling interval setting unit 8 is connected to the interval element comparator. 12 is connected. Thereafter, every time the injection molding machine 1 takes 10,000 shots (according to the above, approximately 83 hours), the fueling device 6 operates for 3 minutes.
[0030]
Thus, since the interval element value of the oil supply interval setting device 7 that works first is smaller than the interval element value of the other oil supply interval setting device 8 that works later, the machine that requires a large amount of lubricating oil. At the beginning of use, a lubricating oil that meets the requirements is supplied to each oil supply location, and after a familiarity has progressed over time, a small amount of lubricating oil suitable for the lubricating oil is supplied. Accordingly, it is possible to alleviate the adverse effects of abnormally wearing the lubricated part due to insufficient supply of the lubricating oil, or contaminating the surroundings and the molded product by excessively supplying the lubricating oil.
[0031]
As described above, if the set operating amount of the operating amount setter 10 is set to be an integral multiple of the set interval element value of the fueling interval setter 7 converted to time (in the above case, 20 times = 500/25 ), and when the fueling device 6 is operated, it is switched to the next fueling interval setting device 8 with good separation, so that the condition is good.
[0032]
However, if the set interval element value of the refueling interval setting device 7 and the set operation amount of the operation amount setting device 10 are made different depending on the number of shots and the operation time, or vice versa, Differently, errors are likely to occur, and the oil supply device 6 does not always operate well before or immediately after the oil supply interval setting devices 7 and 8 are switched.
Thus, when the refueling interval setter 7 is switched to the next refueling interval setter 8 leaving the number of interval elements, the interval element comparator 12 is set to the number of interval elements left in the refueling interval setter 7. It is preferable to add and continue the comparison.
[0033]
The types of set interval element values between the oil supply interval setting devices 7 and 8 can be made different from each other, for example, the setting device 7 is the number of shots, the setting device 8 is the operation time, or vice versa. In this way, at least the set interval element value of the fuel supply interval setting device 7 and the set operation amount of the operation amount setting device 10 can be easily matched with each other.
[0034]
Although the automatic lubrication apparatus 5 shown in the figure has two oil supply interval setting devices 7 and 8, the number of oil supply interval setting devices can be three or more. In this case, it goes without saying that the switch 9 is changed in accordance with the number of refueling interval setting devices. The oiling interval setting devices 7 and 8 can be operated alternately to increase the number of switching stages to three or more. In this case, if necessary, the setting content of the refueling interval setter during the pause is changed.
[0035]
The interval element values of the oil supply interval setting devices 7 and 8 and the operation amount of the operation amount setting device 10 are determined by, for example, the product of the mold opening / closing stroke and the number of shots (number of cycles), the injection stroke and the number of shots. Or the product of In this case, even when the operation stroke of the injection molding machine 1 is changed, an appropriate amount of lubricating oil corresponding to that can be accurately supplied.
The oil supply time setting device 13 and the oil supply comparator 14 can be omitted.
[0036]
【The invention's effect】
As described above, according to the first aspect of the present invention, the lubrication point can be lubricated with an appropriate amount of lubricating oil corresponding to the operation time of the injection molding machine. Accordingly, it is possible to alleviate the inconvenience of prematurely wearing the lubrication part due to insufficient supply of the lubricating oil, or contaminating the surroundings and the molded product due to excessive supply of the lubricating oil.
[0037]
The automatic lubrication device for an injection molding machine according to claim 1, wherein a lubrication time setting device for setting a lubrication time of the lubrication device, a set lubrication time set in the lubrication time setter, and an actual actual lubrication time of the lubrication device, When the actual lubrication time reaches the set lubrication time, and a configuration is provided with a lubrication comparator that outputs a signal and stops the lubrication system, lubricate at the end of lubrication at the longest lubrication location. The apparatus can be stopped and waste can be eliminated.
[0038]
According to the fifth aspect of the invention, by supplying a large amount of lubricating oil to the lubrication part at the beginning of use of the injection molding machine to avoid insufficient lubrication, early wear of the lubrication part is suppressed, and familiarity of the lubrication part is known. After the advancement, the amount of lubricating oil supplied can be automatically reduced to prevent the surroundings and molded articles from being soiled.
[0039]
According to the sixth aspect of the present invention, the type of the interval element value that best suits the operation amount of the injection molding machine can be freely selected, so that accurate control is possible.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of an automatic lubrication apparatus for an injection molding machine according to the present invention.
FIG. 2 is a diagram of a conventional lubrication device for an injection molding machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Clamping device 3 Injection device 5 Automatic lubrication device 6 Lubrication device 7, 8 Lubrication interval setting device 9 Switcher 10 Operation amount setting device 11 Switching comparator 12 Interval element comparator 13 Lubrication time setting device 14 Refueling comparator

Claims (6)

In the automatic lubrication device of an injection molding machine that supplies lubricating oil such as grease to the supply location of the injection molding machine with a lubrication device,
A plurality of fueling interval setting devices for setting the fueling interval of the fueling device according to different interval element values of the injection molding machine;
A switching device for switching the plurality of oiling interval setting devices;
An operation amount setting device for setting the operation amount of the injection molding machine;
The set operation amount set in the operation amount setting device is compared with the actual actual operation amount of the injection molding machine, and when the actual operation amount reaches the set operation amount, a signal is output and another oiling interval is supplied to the switch. A comparator for switching to be switched to the setting device;
The switching device by comparing any one set intervals element values of a plurality of oil supply interval setter for switching the connection between the actual number of real intervals element of the injection molding machine, the number of real intervals element reaches the set interval element value An automatic lubrication device for an injection molding machine, comprising: an interval element comparator for outputting a signal and operating the oil supply device. An oiling time setter for setting the oiling time of the oiling device;
Comparing the set lubrication time set in the lubrication time setter with the actual actual lubrication time of the lubrication device, and when the actual lubrication time reaches the set lubrication time, outputs a signal and stops the lubrication device The automatic lubrication device for an injection molding machine according to claim 1, comprising:   The automatic lubrication device for an injection molding machine according to claim 1 or 2, wherein the interval element value set in the oil supply interval setting device is the number of shots or the operating time of the injection molding machine.   The automatic lubrication device for an injection molding machine according to any one of claims 1 to 3, wherein the operating quantity of the injection molding machine set in the operating quantity setting unit is an operating time or the number of shots. In the automatic lubrication device of the injection molding machine according to any one of claims 1 to 4,
The refueling interval of one refueling interval setter that is connected to the interval element comparator first by the switcher is later than the refueling intervals of other refueling interval setters that are connected to the interval element comparator by the switcher later. An automatic lubrication method for an injection molding machine, characterized in that the interval element values are set so as to shorten the length of the lubrication to lubricate the lubrication part of the injection molding machine.   The automatic lubrication device for an injection molding machine according to any one of claims 1 to 4, wherein different types of interval element values are set in a plurality of lubrication interval setting devices to lubricate the lubrication location of the injection molding machine. An automatic lubrication method for an injection molding machine.

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