JPS6345295Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a lubricating device for lubricating movable parts such as toggle links in a mold clamping device of an injection molding machine, and particularly relates to a lubricating device for lubricating moving parts such as a toggle link in a mold clamping device of an injection molding machine, and particularly for lubricating a lubricant tank, a waste oil recovery tank, and a refueling pump. and a filtration pump separately, or by using a refueling tank that also serves as a waste oil recovery tank (hereinafter referred to as a "waste oil recovery refueling tank") and a refueling pump that also serves as a filtration pump (hereinafter referred to as a "filtering refueling pump"). The present invention relates to a lubricating oil circulation type lubricating device in which parts (lubricating points) are lubricated, and waste oil collected from the oil is cleaned, circulated, and reused.

[Prior art]

FIG. 1 is a simplified front view showing an example of a conventional device.

In FIG. 1, a mold clamping device of an injection molding machine is composed of a fixed platen 1, a movable platen 2, an end housing 3, a tie bar 4, a toggle link 5, and the like. A toggle bushing 7 and a tie bar bushing 8 are provided at the rotating contact portion between the toggle link 5 and the toggle pin 6 and the sliding portion between the movable platen 2 and the tie bar 4, respectively, and these oil supply points are designed to reduce frictional resistance during movement. Lubricating oil is distributed to prevent wear on contact surfaces.

In the past, a lubricating system distributed lubricating oil to oil supply points such as the toggle bushing 7 and tie bar bushing 8 through the oil supply pipe 10 and the distribution joint 11 using an oil supply pump, and used the waste oil that dripped or flowed from the oil supply points to the oil pan 12 and the like. The structure is such that the waste oil is collected into a waste oil recovery tank via an oil drain pipe 19 via an oil receiver 13, etc., and the recovered waste oil is subject to deterioration due to frictional heat at the oil supply point, contamination with fine metal pieces, and further contamination with dust during the recovery process. It was determined that reuse in the state in which it had been collected was inappropriate, and it was disposed of as is.

However, in recent years, as oil prices have soared and pollution issues have become more important, the costs of purchasing lubricating oil and processing waste oil can no longer be ignored.As a result, the so-called lubricating oil circulation method, which cleans, circulates, and reuses waste oil, has become difficult to ignore. Lubricating devices are emerging.

The conventional device shown in FIG. 1 is one example. This conventional device uses a waste oil recovery/refueling tank 14 and a filtration/refueling pump 9. The lubricating oil in the waste oil recovery/refueling tank 14 is transferred to a pump driving electric motor
The filtration and oil supply pump 9 driven by the filtration pump 9 distributes and supplies oil to oil supply points such as the toggle bush 7 and tie bar bush 8 through the precision filter 16, oil supply pipe 10 and distribution joint 11, and collects the waste oil that drips or flows from these oil supply points. The waste oil is collected through an oil pan 12 above the bed 18, an oil receiver 13 at the top of the bed 18, etc., and then from a waste oil pipe 19 to a waste oil collection/refueling tank 14. Relatively large dust and impurities in this collected waste oil are removed by a wire mesh filter 15, and fine dust and impurities are removed by a precision filter 16 to make clean oil, and then this clean oil is filtered and pumped into a fuel supply pump that also serves as a filter. 9, the oil is circulated through the oil supply pipe 10.

However, injection molding machines use a large amount of cooling water to cool the mold, heating tube hopper, etc.
When a large amount of cooling water leaks due to a work error or damage to the cooling water piping, the large amount of cooling water flows into the waste oil collection path for lubricating oil from the oil pan 12, oil pan 13, etc., and is sent to the waste oil collection and oil supply tank. 14 and accumulates at the bottom. In addition, over a long period of time, moisture in the atmosphere gradually mixes into the waste oil and accumulates at the bottom of the tank 14.

In the conventional device described above, this accumulated water can be sucked and discharged together with waste oil by the filtration/oil supply pump 9 and removed by the precision filter 16, but the filter gets clogged quickly and the frequency of filter replacement increases, resulting in an increase in cost. Not only does this increase the amount of water that accumulates in the waste oil collection and refueling tank 14, but it also damages the filtration and refueling pump 9, or the water that is not sufficiently removed by the filter of the precision filter 16 and is discharged into the refueling pipe 10, causing problems in refueling. There is a risk of rust forming on the piping 10, oil supply points, etc.

These defects are caused by the waste oil collection and refueling tank 14.
This problem can be solved by installing a viewing window in the tank, periodically inspecting the interior through this window, and removing the water that has accumulated at the bottom, but impurities in the waste oil adhere to the viewing window and it quickly becomes dirty and becomes invisible. Therefore, inspection work cannot be carried out early, and it is not easy to remove the dirt, and if a large amount of water flows in at once, it is difficult to detect it early and it is impossible to prevent the above-mentioned drawbacks of rusting.

In addition, the present inventors have already proposed a lubricating device for an injection molding machine in Utility Application No. 55-079030.

This lubrication system distributes and supplies lubricating oil from the oil tank to the oil supply points via the oil supply piping using the oil supply pump, collects the waste oil discharged from the oil supply points into the waste oil recovery tank, and filters dust, etc. in the collected waste oil. In this system, the cleaned oil is returned to the oil supply tank using a filter pump and then circulated through the oil supply piping by the oil supply pump, but such a system also has the same drawbacks as described above.

[Purpose of invention]

The present invention was developed in view of the above-mentioned points.In the lubrication system of the injection molding machine using the lubricating oil circulation method as described above, moisture from the atmosphere gets mixed into the waste oil, or a large amount of moisture enters the waste oil recovery path. When the level of water that has accumulated in the waste oil recovery tank or waste oil recovery/refueling tank reaches a predetermined level due to water contamination, this is immediately detected and the water accumulated at the bottom is removed, allowing the microfilter to It slows down filter clogging and reduces the frequency of filter replacement, reducing costs. It also prevents damage to the filtration pump or filtration/oil supply pump due to accumulated water, and prevents rust from forming on the oil supply piping and oil supply points. The object of the present invention is to provide a lubricating device for an injection molding machine that can reduce maintenance work and improve the reliability of the entire device.

[Structure of the idea]

In order to achieve the above object, the device of the present invention is used in the lubrication device of the injection molding machine of Utility Application No. 55-079030 or the lubrication device of the injection molding machine shown in the first drawing. Or the filtration and oil supply pump 9 in the waste oil recovery and oil supply tank 14
An oil/water boundary detection level switch 20 for detecting the boundary between lubricating oil and water is installed at a position lower than the suction port 24 of the
A level switch 20 for oil/water boundary detection is provided.
is connected to the accumulated water abnormality indicator 21 as shown in the third figure.

[Configuration of Example]

FIG. 2 is a simplified front view showing one embodiment of the device of the present invention, and FIG. 3 is a connection diagram of the control system thereof.
First, the configuration will be described.

In Fig. 2, 14 is the bed 18 of the injection molding machine.
A waste oil recovery/refueling tank 9 installed inside the waste oil recovery/refueling tank 14 is a filtration/refueling pump installed in the waste oil recovery/refueling tank 14, and is driven by a pump driving electric motor 17. Reference numeral 15 denotes a wire mesh filter provided in the waste oil collection/refueling tank 14, which removes relatively large dust and impurities from the waste oil. Reference numeral 16 denotes a precision filter attached to the side of the oil supply tank 14 that also serves as waste oil recovery, and is used to remove fine dust and impurities.

The discharge port of the filtration oil supply pump 9 is the precision filter 1
6. It is connected to oil supply points such as a toggle bush 7 and a tie bar bush 8 via a fuel supply pipe 10 and a distribution joint 11. An oil pan 1 is installed at the bottom of the movable platen 2 to catch dripping or flowing waste oil.
2 is attached, and an oil receiver 13 having an inclined surface for receiving waste oil is also provided at the top of the bed 18. The lower end of this oil receiver 13 and the inside of a wire mesh filter 15 in the waste oil recovery and oil supply tank 14 are connected by an oil drain pipe 19.

In this embodiment, in the above-mentioned lubricating device,
Slanted bottom surface 2 at the bottom of the waste oil collection and refueling tank 14
A water reservoir section 23 is provided into which water flows in through the water reservoir section 2, and in this water reservoir section 23, in other words, at a position lower than the discharge port 24 of the filtration and oil supply pump 9, there is a float whose apparent specific gravity is larger than that of oil and smaller than that of water. An oil/water boundary detection level switch 20 is provided to detect the boundary between upper and lower oil and water by the movement of the float due to the difference in specific gravity. As this level switch 20 for oil/water boundary detection, a commercially available level switch can be used, and one made by changing the material of the float or the amount of internal air space, or adding a weight can be used.

An oil drain valve 25 is connected to the bottom surface of the water reservoir section 23, and a drain valve 26 for removing accumulated water is connected to the side surface of the water reservoir section 23 at a position slightly higher than the bottom surface.

Further, an oil level detection level switch 27 is provided in the waste oil collection/refueling tank 14, which is activated when the amount of oil inside falls below a certain level. A permanent magnet 28 that attracts magnetic substances in the waste oil is fixed to the inclined bottom surface 22 of the waste oil recovery/refueling tank 14.

Pump driving electric motor 17, oil level detection level switch 27, and oil/water boundary detection level switch 27
The oil/water boundary detection level switch 20 is connected to a discharge amount controller 30, a lubricating oil abnormality indicator 31, and a accumulated water abnormality indicator 21 provided in the electric control device 29 of the injection molding machine, respectively, and these abnormality indicators An alarm buzzer 32 is connected to 31 and 21.

Note that the drain valve 26 may be an electromagnetically actuated valve, and the accumulated water may be automatically drained in conjunction with the oil/water boundary detection level switch 20.

[Effect of the embodiment]

Next, its effect will be explained. When the filtering and refueling pump 9 is driven by the pump driving electric motor 17,
The lubricating oil in the waste oil recovery/oil supply tank 14 is sucked into the filter/oil supply pump 9, pressurized, and discharged from the pump 9. This discharged lubricating oil passes through a precision filter 16 to remove minute dust and impurities from the oil, and then is distributed and supplied to oil supply points such as the toggle bush 7 and tie bar bush 8 through the oil supply pipe 10 and distribution joint 11. .

The waste oil that drips or flows down from this oil supply point passes through the oil pan 12, oil pan 13, etc., and then goes to the oil drain pipe 19.
The oil flows down into the wire mesh filter 15 in the oil supply tank 14 for waste oil collection and is collected, and large dust and impurities in the oil are removed by the wire mesh filter 15.

The waste oil collected in the waste oil collection/refueling tank 14 in this way contains fine dust, impurities, and water that were not removed by the wire mesh filter 15, but the fine dust and impurities are When the lubricating oil is distributed and supplied to the lubricating points by the filtration and oil supply pump 9, it is removed by the precision filter 16. Since water has a higher specific gravity than oil, it settles while being stored in the waste oil collection/refueling tank 14, flows down on the inclined bottom surface 22, and accumulates in the water reservoir 23. In addition, heavy impurities not removed by the wire mesh filter 15 settle alone or together with water and accumulate in the water reservoir 23, and magnetic substances such as iron pieces are attracted to the permanent magnet 28 fixed to the inclined bottom surface 22. .

In this way, the waste oil collected in the oil supply tank 14 that also serves as waste oil recovery is purified, and this clean oil is passed through the oil supply pipe 10 and the distribution joint 11 by the oil supply pump 9 that also serves as a filter.
It will be circulated through such steps. The discharge amount and discharge interval of the filtration and oil supply pump 9 are controlled by a discharge amount controller 30 connected to the pump driving electric motor 17, so that lubrication at the oil supply point is performed smoothly. .

When the amount of water accumulated in the water reservoir 23 increases and the interface between water and lubricating oil rises, and the interface reaches the installation level of the oil-water boundary detection level switch 20,
The level switch 20 is immediately activated and the boundary is detected. Due to this detection, the accumulated water abnormality indicator 2
1 is activated to display that the water level of the reservoir has reached a predetermined level, that is, an abnormality, and the abnormality alarm buzzer 32 is activated to issue an alarm. The operator can quickly open the drain valve 26 and take out the water.

In addition, due to work errors or damage to the cooling water piping, a large amount of cooling water that cools the molds, heating cylinders, etc. leaks out and flows into the waste oil recovery path from the oil pan 12, oil pan 13, etc. 14 and accumulates in the water reservoir 23, and when the water level reaches a predetermined level, the accumulated water abnormality indicator 21 and the abnormality alarm buzzer 32 will notify the operator of the abnormality, so that the operator can immediately drain the water. water can be removed by opening the water valve 26.

When the amount of oil in the waste oil collection/refueling tank 14 falls below a certain level due to oil leakage, natural evaporation, etc., the oil level detection level switch 27 is activated, and the lubricating oil abnormality indicator 31 connected to the level switch 27 is activated. At the same time, an abnormality alarm buzzer 32 connected to the abnormality indicator 31 is activated to issue an alarm. If you receive a notification that the oil level is low, you can replenish the lubricating oil.

The oil drain valve 25 is used when the lubricating oil becomes contaminated and cannot be reused and needs to be replaced.By opening the valve 25, the contaminated oil can be drained. At this time, impurities accumulated at the bottom of the water reservoir 23 can also be discharged.
Thereafter, the valve 25 may be closed and new lubricating oil may be supplied into the oil supply tank 14 which also serves as waste oil recovery.

[Effects of Examples]

As described above, in this embodiment, an oil/water boundary detection level switch 20 for detecting the boundary between lubricating oil and water is provided at a position lower than the suction port 24 of the filtration/refueling pump 9 in the waste oil recovery/refueling tank 14. Since this level switch 20 is connected to the accumulated water abnormality indicator 21, when the water level of the water accumulated at the bottom of the waste oil collection/refueling tank 14 reaches a predetermined level, the level switch 20 for oil/water boundary detection is activated immediately, and the Since the abnormality can be indicated by the water abnormality indicator 21, the collected water can be taken out quickly. As a result, it is possible to avoid drawing and discharging accumulated water by the filtration and oil supply pump 9 and removing it by the precision filter 16, which slows down the clogging of the filter, reduces the frequency of filter replacement, and reduces costs. Not only is this possible, but it is also possible to avoid damage to the filtration and oil supply pump 9 due to accumulated water and rust on the oil supply piping 10, oil supply points, etc., thereby reducing maintenance work and increasing the reliability of the entire device.

In particular, since a water reservoir 23 is provided at the bottom of the waste oil collection/refueling tank 14 through which water flows through the inclined bottom surface 22, water can be collected and stored in this water reservoir 23, and the accumulated water can be used for filtering/refueling. There is no suction and discharge by the pump 9 and removal by the precision filter 16, and there is no abnormality alarm buzzer 32.
Also, since abnormality can be detected more reliably and easily, the above-mentioned effects can be further improved. Note that the accumulated water can be taken out from a drainage valve 26 connected to the side surface of the water reservoir section 23.

A water reservoir 23 is provided at the bottom of the waste oil collection/refueling tank 14, and a permanent magnet 28 is fixed to the inclined bottom surface 22 of the tank 14, so that heavy impurities that cannot be removed by the wire mesh filter 15 are removed. The water can be stored in the water reservoir 23, and magnetic substances such as iron pieces can be attracted to the permanent magnet 28.

In addition, a level switch 27 for oil level detection is provided in the waste oil collection and refueling tank 14, and the level switch 27 is connected to the lubricating oil abnormality indicator 31.
Furthermore, since it is connected to the abnormality alarm buzzer 32,
You can know when there is a lack of oil.

[Other Examples]

The present invention is also applicable to the injection molding machine lubrication system proposed by the inventors in Utility Application No. 55-079030, in which the oil supply tank and waste oil recovery tank, as well as the oil supply pump and filtration pump, are provided separately. can.

In this case, an oil-water boundary detection level switch 20 may be provided in the waste oil recovery tank at a position lower than the suction port of the filtration pump, and this level switch 20 may be connected to the accumulated water abnormality indicator 21.

The water reservoir 23, permanent magnet 28, liquid level detection level switch 27, etc. can also be provided in the same manner as described above.

[Effect of idea]

As can be understood from the above explanation, the present invention is capable of transferring the lubricating oil in the oil supply tank or waste oil recovery oil tank 14 to the oil supply pump or filtration oil supply pump 9.
The waste oil is distributed and supplied to the oil supply points via the oil supply pipe 10, and the waste oil discharged from the oil supply points is collected in a waste oil recovery tank or a waste oil collection/refueling tank 14, and the dust, etc. in the recovered waste oil is filtered through a filter 15,
In a lubrication system for an injection molding machine, the oil removed in step 16 and cleaned is returned to the oil supply tank by a filtration pump and then circulated by the oil supply pump, or the cleaned oil is circulated through the oil supply piping by a filtration and oil supply pump 9. , for detecting the boundary between lubricating oil and water, at a position lower than the suction port of the filtration pump in the waste oil recovery tank or the suction port 24 of the filtration and refueling pump 9 in the waste oil recovery and refueling tank 14. A level switch 20 is provided, and this oil/water boundary detection level switch 20 is connected to the accumulated water abnormality indicator 21, so that the water level of the accumulated water at the bottom of the waste oil recovery tank or waste oil recovery/refueling tank 14 is maintained at a predetermined level. When the level is reached, the level switch 20 for oil/water boundary detection is activated immediately, and the abnormality can be indicated by the accumulated water abnormality indicator 21, so that the accumulated water can be quickly taken out. As a result, it is possible to avoid drawing and discharging accumulated water by the filtration pump or filtration/oil supply pump 9 and removing it by the filter 16, which slows down the clogging of the filter, reduces the frequency of filter replacement, and reduces costs. In addition, it is possible to avoid damage to the filtration pump or filtration/oil supply pump 9 due to accumulated water and rust on the oil supply pipe 10, oil supply points, etc., reducing maintenance work and increasing the reliability of the entire device. be able to.

[Brief explanation of the drawing]

FIG. 1 is a simplified front view showing an example of a conventional device; FIG. 2 is a simplified front view showing an embodiment of the device of the present invention;
FIG. 3 is a connection diagram of the control system. 7...Toggle button, 8...Tie bar button, 9...Filtration and oil supply pump, 10...Oil supply pipe, 11...Distribution joint, 12...Oil pan, 1
3... Oil receiver, 14... Waste oil collection and refueling tank, 15... Wire mesh filter (filter), 16...
(Precision) filter, 19...Oil drain pipe, 20...Level switch for detecting oil/water boundary, 21...Recumbent water abnormality indicator, 22...Slanted bottom surface, 23...Water pool, 2
4... Suction port, 25... Oil drain valve, 26...
Drainage valve, 27... Level switch for liquid level detection, 28... Permanent magnet, 31... Lubricating oil error indicator, 32... Abnormality alarm buzzer.

Claims (1)

[Scope of claim for utility model registration] Lubricating oil in a refueling tank or waste oil recovery refueling tank is distributed to a refueling point via a refueling pipe using a refueling pump or a filtering refueling pump, and the waste oil discharged from this refueling point is recovered as waste oil. The collected waste oil is collected in a tank or a refueling tank that also serves as waste oil recovery, and the dust etc. in the collected waste oil is removed using a filter, and the purified oil is returned to the refueling tank using a filtration pump, and then the purified oil is In a lubrication system for an injection molding machine in which the oil is circulated through the oil supply piping by a filtration oil supply pump, the lubrication system is lower than the suction port of the filtration pump in the waste oil recovery tank or the suction port of the filtration and oil supply pump in the waste oil collection and oil supply tank. 1. A lubricating device for an injection molding machine, characterized in that an oil-water boundary detection level switch for detecting a boundary between lubricating oil and water is provided at a position, and the oil-water boundary detection level switch is connected to a accumulated water abnormality indicator.