JP3805270B2 - Machine fluid supply equipment for machine tools - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a machining fluid supply for a machine tool that separates a used machining fluid mixed with machining scraps collected from a machining section into machining scraps and a machining fluid, and recirculates and supplies the cleaned machining fluid to the machining section again. Relates to the device.
[0002]
[Prior art]
In machine tools such as milling machines, machining centers, grinding machines, and electrical discharge machines, machining fluid is supplied to the workpiece machining section, the tool and workpiece are cooled, and machining waste generated by machining is removed from the machining section. We are making progress. Then, the used machining fluid containing machining waste is collected in the machining fluid tank of the machining fluid supply device, the machining waste is separated, and the cleaned machining fluid is supplied to the machining section again to process the machine tool and the machining fluid. Circulating between liquid tanks.
Japanese Patent Publication No. 2-44564 discloses a first conventional technique for separating machining scraps from used machining fluid. This is done by immersing the filter drum around which the filter is wound in the used processing fluid and rotating it, and passing the clean processing fluid that has passed through the filter and entered the filter drum into the external clean tank through the inside of the rotary bearing of the filter drum. It is a filtration device of the structure which flows out.
[0003]
As a second prior art, there is a membrane separation device disclosed in Japanese Patent Laid-Open No. 7-47236. This is because when the fluid to be treated is filtered through the first separation membrane (filter) and the second separation membrane having a slightly coarser mesh, the first separation membrane is damaged before the second separation membrane. It is made possible to detect and know the pressure increase in, or the flow rate decrease in the second stage of the second separation membrane.
As a third prior art, there is a solid-liquid separation device disclosed in Japanese Utility Model Laid-Open No. 62-79509. This is because a disk-shaped screen (filter) is rotatably provided at the boundary between the dirty liquid tank and the clean liquid tank, and the cleaned liquid is ejected to the upper surface of the disk-shaped screen while being rotated by a motor. Thus, it is backwashed.
[0004]
[Problems to be solved by the invention]
The first prior art filtration device described above is often used in machine tools. If the filter wound around the filter drum breaks, the processing waste enters the clean tank and is supplied to the machine tool. Therefore, safety measures are usually taken by providing a backup filter after the filter. .
[0005]
An example of the safety measure is the second prior art, in which the backup filter (second separation membrane) is clogged due to breakage of the filter (first separation membrane) of the filtration device, and the front stage of the backup filter that occurs for that reason. The filter breakage of the filtration device is detected by detecting the pressure increase or the flow rate decrease in the subsequent stage. However, impurities in various fine shapes are also mixed in the cleaned working fluid that has passed through the filter of the filtration device, and depending on the posture of the minute impurities, the backup filter may get caught in the eyes. As a result, the mesh in this portion becomes narrower, and minute impurities are more easily caught, and after a few hours or days, the minute impurities adhere to the entire surface of the backup filter in a sludge shape. As a result, the filter of the filter device is not damaged, but it is detected that the filter is damaged, and there is a problem in that a false alarm is generated. In order to prevent this, it is necessary to periodically clean the backup filter and maintain a state in which minute impurities are not attached. That is, there is a problem in that it takes time and a waste time for temporarily stopping the circulation of the machining fluid occurs.
[0006]
And when the backup filter is back-washed as in the third prior art, clogging due to minute impurities is eliminated, but large processing scraps that are caught on the backup filter when the filter of the filter is damaged are pushed back, and the backup filter There is a problem that it takes a long time to become clogged and delays detection of important filter breakage.
The present invention has been made in view of such problems. When the filter of the filter device is not damaged, the backup filter is not clogged. When the filter of the filter device is damaged, the filter is quickly detected. An object of the present invention is to provide a machining fluid supply device for a machine tool that can be used.
[0007]
[Means for Solving the Problems]
Therefore, the machining fluid supply device for a machine tool according to the present invention separates the used machining fluid mixed with machining waste collected from the machining section into machining waste and machining liquid, and supplies the separated machining fluid to the machining section. In the machining fluid supply device of the machine tool, the filtration device that receives the used machining fluid, separates the processing waste mixed through the filter, and flows the clean machining fluid into the first clean tank, and the first clean A backup filter provided at a boundary between the tank and a second clean tank for storing a clean working fluid to be supplied to the processing section; A liquid level sensor that detects a processing liquid level, and jet means that ejects fluid in a direction from the first clean tank to the second clean tank toward the backup filter.
[0008]
A fluid is ejected toward the backup filter in a direction from the first clean tank to the second clean tank. In other words, normal cleaning is performed for reverse cleaning. Since the jet means for normally cleaning the backup filter is provided, the backup filter is forced to flow downstream without catching minute impurities. Even if the minute impurities are supplied to each part of the machine tool, the size is not problematic. Therefore, when the filter of the filtration device is not damaged normally, it is necessary to misdetect that the backup filter is clogged and the filter of the filtration device is damaged, or to manually clean the backup filter periodically. Disappears. In addition, when the filter of the filtration device is damaged, large processing debris is caught on the backup filter, so even if it is cleaned correctly by the jet means, the large processing debris will not pass through the backup filter. Clogging occurs, and the liquid level sensor detects breakage of the filter of the filtering device.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a principle sectional view of an embodiment of a machining fluid supply device for a machine tool according to the present invention.
The used machining fluid mixed with machining waste flows from the machine tool into the dirty tank 3 at the right end of the machining fluid tank 1. The used working fluid that has flowed into the dirty tank 3 is filtered by passing through the filter 7 of the filtering device 5 as shown in the first prior art, for example. The configuration may be such that the dirty tank 3 is not provided and the machine tool directly flows into the machining fluid receiving port of the filtration device 5.
[0010]
The clean working fluid separated and filtered by the filtering device 5 flows into the first clean tank 9. The machining fluid flows into the second clean tank 13 through the backup filter 11, is sucked up by the pump P provided in the second clean tank 13, and is supplied to the machine tool through the pipe line 15. The pump P is driven by the motor M1.
[0011]
The backup filter 11 has a disk shape, and a circumferential portion thereof is hermetically supported by a support 17 so as to be rotatable. The backup filter 11 is provided on a pulley 19 provided on a central axis and a rotary shaft of a motor M2 provided outside. The belt transmission means 23 placed between the pulley 21 and the pulley 21 rotates at a predetermined rotational speed. The mesh of the backup filter 11 is set to be equal to or coarser than the filter 7 of the filtration device 5. And the ejection nozzle 25 provided in the 1st clean tank 9 side ejects the clean process liquid branched and supplied from the pipe line 15, and cleans the backup filter 11 normally. The ejection nozzle 25 may be provided on the liquid surface, and a clean working liquid may be ejected to the upper surface of the backup filter 11 to perform normal cleaning. Further, compressed air may be ejected instead of a clean working fluid. Further, the backup filter 11 may be configured to be rectangular, for example, fixed in the machining liquid tank 1, and provided with a number of ejection nozzles 25 so that the entire mesh surface of the backup filter 11 can be cleaned normally.
A liquid level indicator 27 for detecting that the liquid level of the first clean tank 1 has reached a predetermined liquid level is provided, and its output is connected to the notification means 29.
[0012]
Next, the operation of the machining fluid supply device of this machine tool will be described.
Even if the filter 7 of the filtration device 5 is not damaged and the filtration function is normally performed, impurities in various shapes are mixed in the cleaned working fluid. This minute impurity has a size that does not cause a problem even if it is supplied to a machining fluid nozzle or a through spindle coolant device of a machine tool. Therefore, it is not necessary to further filter this processing liquid. However, if this minute impurity is fine and long, bifurcated, or curled, it may be caught by the mesh of the backup filter 11. As described above, the entire surface of the backup filter 11 may be clogged due to this. The processing liquid is ejected from the ejection nozzle 25 to prevent this clogging. Even if a minute impurity is caught on the mesh of the backup filter 11, it is forced out toward the second clean tank 13 by the force of the ejected machining liquid. Since the backup filter 11 is rotating, the entire surface is uniformly cleaned. Therefore, there is no need to interrupt the operation of the machine tool and manually clean the backup filter 11. In this case, the liquid level in the first clean tank 9 does not rise above the predetermined position, and the liquid level gauge 27 is operated, so that no false report of breakage of the filter 7 of the filtering device 5 is generated.
[0013]
When the filter 7 of the filtration device 5 is damaged and a large amount of processing waste flows into the first clean tank 9, the processing waste is caught on the backup filter 11. Even if the machining liquid is ejected from the ejection nozzle 25 and the backup filter 11 is cleaned normally, the machining waste is large and the machining waste cannot be pushed out toward the second clean tank 13. Clogging. Then, the liquid level indicator 27 is activated to notify the notification means 29 of the breakage of the filter 7 of the filtration device 5, and an alarm is issued or the machine tool is automatically stopped. If the backup filter 11 has been back-washed as in the third prior art, large processing debris caught on the backup filter 11 is pushed back into the first clean tank 9, clogging of the backup filter 11 is delayed, and the liquid level is increased accordingly. The time until the operation of the scale 27 becomes longer. That is, it is possible to quickly detect the breakage of the filter 7 of the filtration device 5 by positively washing the backup filter 11 with the ejection nozzle 25.
[0014]
【The invention's effect】
As described above, according to the machining fluid supply device for a machine tool of the present invention, the backup filter is clogged by a simple configuration in which the backup filter is cleaned normally when the filter of the filtration device is not damaged. First, when the filter of the filtration device is broken, the breakage can be detected quickly.
[Brief description of the drawings]
FIG. 1 is a principle sectional view of an embodiment of a machining fluid supply device for a machine tool according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Processing liquid tank 3 ... Dirty tank 5 ... Filtration apparatus 7 ... Filter 9 ... 1st clean tank 11 ... Backup filter 13 ... 2nd clean tank 25 ... Jet nozzle 27 ... Liquid level gauge 29 ... Notification means

Claims (3)

In a machining fluid supply device of a machine tool that separates used machining fluid mixed with machining waste collected from a machining section into machining waste and machining fluid, and supplies the separated machining fluid to the machining section,
A filtration device that receives the used machining fluid, separates the processing waste mixed through the filter, and flows the clean machining fluid into the first clean tank;
A backup filter provided at a boundary between the first clean tank and a second clean tank for storing a clean working fluid to be supplied to the processing unit;
A liquid level sensor for detecting the processing liquid level of the first clean tank;
Jet means for jetting fluid in a direction from the first clean tank toward the second clean tank toward the backup filter;
A machine tool supply apparatus for machine tools, comprising: 2. The machining fluid supply device for a machine tool according to claim 1, wherein the backup filter is a rotatable disk-shaped filter that is partially exposed on the machining fluid level, and is driven to rotate by a driving unit. The machining fluid supply device for a machine tool according to claim 1 or 2, wherein the jet means ejects a clean machining fluid filtered by the filtration device.

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