JP5774949B2 - Coolant purification device and method for removing accumulated chips - Google Patents

Description

  The present invention relates to a coolant purifying apparatus for filtering and discharging chips from a dirty coolant liquid mixed with chips discharged from a machine tool such as a lathe, a milling machine, or a grinding machine, and a method for removing accumulated chips.

  In machine tools such as lathes, milling machines, and grinding machines, coolant fluid (cutting fluid) is supplied to the machining area where the cutting tool such as a bite and cutter and the workpiece (workpiece) come into contact to generate heat at the machining area. Wet type, which performs processing while suppressing, has become the mainstream. This wet type machine tool is permanently provided with a coolant purification device. The coolant purifier separates and discharges the chips (metal pieces and metal powder removed from the workpiece) from the coolant liquid mixed with the chips discharged from the machine tool, and removes the chips by filtering means. Recycled into a clean coolant solution and supplies it to machine tools.

  As a coolant purifying apparatus that transports while separating chips from dirty liquid mixed with chips, there is a scraper type conveyor to which a scraper for scraping scraps is attached to a chain conveyor. The chain conveyor is a revolving drive system, and whether the supply pump for supplying the coolant liquid to the processing site is disposed near the liquid surface of the coolant liquid (Patent Document 1), or the chain conveyor is disposed off the position of the chain conveyor. (Patent Document 2).

  On the other hand, there is a vortex circulation type coolant purifier that stores coolant liquid in a circular tank and generates vortex flow such as a stirring pump to prevent chips from accumulating in the circular tank. In this apparatus, a pump used for stirring and a supply pump for supplying coolant liquid to the machine tool are arranged so as to be deeply submerged in a circular tank (Patent Documents 3 and 4).

Japanese Utility Model Publication No. 3-126538 JP 2006-159393 A Japanese Patent No. 3507710 Japanese Patent No. 38975587

  However, the vortex circulation type coolant purifying apparatus using a circular tank has the advantage that the structure is simple and the number of parts can be reduced, and the supply pump can be arranged so as to be submerged deeply in the circular tank. Since a vortex is generated in the coolant liquid, there is a problem that the pump used for stirring requires a large power (estimated to be about 100 W per 100 L). Moreover, the liquid temperature of a coolant liquid rises, and it has a problem which is not preferable as what suppresses the heat_generation | fever of a process site | part. Furthermore, dead space is created due to the circular tank.

In addition, since a conveyor having a conveyor such as a chain conveyor is always driven by a rotary drive type, there are problems that power consumption increases and the liquid temperature rises. Furthermore, although the supply pump is arranged on the liquid level, the scraping means is attached to the outer periphery at a predetermined interval, so that the supply pump cannot be arranged deeply in the coolant liquid and must be arranged near the liquid level. There is also a problem that the water depth of the sedimentation tank has to be deepened and the size cannot be reduced.
And in such a conventional apparatus, although it takes a certain amount of time for the chips to accumulate in the tank, a vortex is always generated, or a conveying means such as a chain conveyor is always driven. It is the actual situation.

  Accordingly, an object of the present invention is to enable chips to be discharged only when accumulated in the settling tank without constantly operating the conveying means and the scraping means, and to suppress the rise in the coolant temperature as much as possible. The present invention provides a coolant purifying apparatus and a method for removing accumulated chips capable of reducing a dead space by disposing a supply pump for supplying a coolant liquid to a machine tool sufficiently submerged in a settling tank. There is.

  The coolant purifying apparatus of the present invention includes a sedimentation tank that allows a dirty coolant liquid mixed with chips discharged from a machine tool to flow in, a scraping means that scrapes up chips accumulated on the bottom surface of the sedimentation tank, and a scraping apparatus. A conveying means for conveying the means is provided, and the scraping means is discharged by reciprocating the scraping means to the discharge port at predetermined time intervals by the conveying means. Further, the method for removing accumulated chips of the present invention includes a sedimentation tank into which a dirty coolant liquid mixed with chips discharged from a machine tool is allowed to flow, and a scraping that scrapes up accumulated chips on the bottom surface of the sedimentation tank. Elevating means, an endless conveyor for conveying the scraping means, and a rising slope part where a discharge port is formed in the middle of the slope rising and tilting continuously to the settling tank, and the endless conveyor is reciprocated at predetermined time intervals. The scraping means is reciprocated to the discharge port to discharge the chips, and after discharging, returns to the original position and waits. Here, as the conveying means, an endless conveyor belt, an endless chain belt, a driving cylinder, or the like can be used. Endless conveyors include endless conveyor belts and endless chain belts. As the scraping means, a scraper (scraping plate), a magnet (plate-shaped magnet), or the like can be used.

  According to the present invention, the chips accumulated on the bottom surface of the sedimentation tank are not rotated at all times by the conveying means, but are reciprocated at intervals of a predetermined time. That is, the scraping means is reciprocated to the discharge port to discharge the chips, and after discharging, return to the original position and wait. Accordingly, it is possible to reciprocate at a predetermined time interval or to drive only when chips are accumulated.

According to the present invention, there are a pair of left and right endless chain belts, the scraping means is attached between the pair, and one scraping means is attached only to the lower side of the endless chain belt. Features.
According to the present invention, the scraping means only needs to be attached to the lower side of the endless conveyor belt and does not need to be attached to the upper side of the endless conveyor belt, so that the height of the conveying means can be reduced. In addition, since only one scraping means is sufficient, an apparatus configuration in which the length of the endless conveyor belt is shortened is possible.

According to the present invention, a supply pump that supplies coolant liquid to a machine tool is provided, and is arranged close to the bottom of the settling tank using the space above the chain conveyor to which the scraping means is not attached. Preferably it is.
According to the present invention, since the scraping means is not attached to the upper side of the endless chain belt, the supply pump can be disposed close to the bottom of the settling tank.

According to the present invention, the settling tank includes a rectangular parallelepiped main body portion and a rising inclined portion that rises and inclines toward the discharge port, and the scraping means at least rises from the rectangular parallelepiped main body portion. It is preferable to reciprocate between the inclined portion and the outlet.
According to the present invention, it is a rectangular parallelepiped sedimentation tank, and scraps accumulated on the bottom of the rectangular parallelepiped main body can be removed by the scraping means spanned between the pair of endless chain belts. There is no dead space as in the case of a round tank.

The present invention preferably includes a detecting means for detecting the forward arrival position of the scraping means and a detecting means for detecting the reverse arrival position, and switching between the reciprocating motions based on the result of detection by these detection means. As the detection means, a limit switch that detects the position by contacting the scraping means is suitable.
According to the present invention, the detection unit can detect a predetermined drive position of the scraping unit or the transport unit and perform a reliable reciprocating operation.

According to the present invention, the chip accumulated on the bottom surface of the settling tank is not always driven to rotate by the conveying means, but is reciprocated at intervals of a predetermined time, thereby reducing the corresponding power consumption and reducing the size of the apparatus. Can be achieved. Also, a rectangular parallelepiped shaped sedimentation tank is scraped up across the entire bottom of the sedimentation tank by a scraping means arranged within the width interval of a pair of endless chain belts, so that it is installed like a conventional round tank There is no such thing as causing dead space. Moreover, since it becomes possible to arrange | position a supply pump close to the bottom part of a sedimentation tank, the state which the conventional supply pump protruded upwards can be suppressed, and size reduction of an apparatus is achieved. In addition, it is possible to prevent a vortex flow from being generated or a situation in which a flow (circulation) always occurs in a certain direction, and to suppress an increase in the liquid temperature.
Furthermore, in the case of an apparatus equipped with a chip transport conveyor, it is possible to arrange one scraping means and reciprocate the chip transport conveyor at a predetermined time interval. In addition to being easy to do and having a structure that does not easily generate coolant liquid waves, it is possible to reduce the power consumption of the conveying means and to make the apparatus capable of quiet design.

It is sectional drawing from the front side which shows the coolant purification apparatus of one Embodiment of this invention. It is a top view of the coolant purification apparatus of the said embodiment. It is sectional drawing from the side surface side of the coolant purification apparatus of the said embodiment. It is sectional drawing of the front side which shows the state which the scraping means of the coolant purification apparatus of the said embodiment moves (forward movement) the bottom part side of a sedimentation tank. It is sectional drawing from the front side which shows the apparatus of the comparative example compared with the apparatus of the said embodiment. It is sectional drawing from the side surface of the apparatus of the said comparative example.

  Specific embodiments to which the present invention is applied will be described below with reference to the drawings.

  In the coolant purifying apparatus 1 of the present embodiment, as shown in FIGS. 1 to 4, a precipitation tank 2, a conveying means 3 disposed in the precipitation tank 2, a driving means M <b> 1 for driving the conveying means, and a conveying means 2, scraping means 3 attached to 2, waste box 5 </ b> A for storing chips discharged from the discharge port 4, filtration device 6 disposed on the settling tank 2, and supply pump for supplying coolant liquid to the machine tool 9 or the like. Further, above the settling tank 2, a filtering device 6 that receives dirty liquid mixed with chips discharged from the machine tool from the pipe line 6a, removes relatively large chips, and discards them in the disposal box 5A. Is provided.

  The filtering device 6 is disposed above the settling tank 2, filters the dirty coolant liquid mixed with the chips discharged from the machine tool, and sends the filtered coolant liquid to the settling tank 2. By the filtration by the filtering device 6, relatively large chips are removed and discarded in the disposal box 5A. However, even fine chips are not filtered, and a dirty coolant liquid in which fine chips are mixed is settling tank. Sent to 2. There is also a type in which a drum-type filtration device is arranged in the sedimentation tank 2, and the present invention can be applied to such a device, but the size of the sedimentation tank is large for the filtration device. Is required.

  The sedimentation tank 2 is composed of a rectangular parallelepiped body portion 2a and a rising slope portion 2b that rises and slopes at a predetermined angle continuously to the body portion, and has a vertical side wall portion 2c on the opposite side. Conveying means 3 is arranged along the bottom of the sedimentation tank 2. A discharge port 7 for discharging the chips S is formed on the upper side of the rising inclined portion 2b, and a waste box 5B is disposed below the discharge port 7.

The conveying means 3 of the present embodiment is a pair of left and right endless chain belts, which spans a drive shaft J1 disposed above the rising inclined portion 2b and a driven shaft J2 provided on the side wall 2c. Has been. A scraping means 4 is attached to the endless chain belt 3. The scraper (scraping plate) 4 of the present embodiment is bent and formed in a “<” shape toward the forward movement direction, but may be an L shape or the like.
The transport means 3 is reciprocated by the drive motor M1. The reciprocating operation may be performed by reciprocating the drive motor M1 by rotating it forward and backward at predetermined time intervals. However, in this embodiment, the limit switch LS for detecting the advance position of the scraping means 4 and the scraping means 4 A limit switch LS for detecting the reverse position is provided to control the reciprocating operation. The upper side 3b of the endless chain belt 3 which is the conveying means 3 of the present embodiment is located above the liquid level e so that the limit switch LS which is an electrical component is not submerged.

  The scraping means 4 scrapes up the chips S accumulated on the bottom of the sedimentation tank 2, and a scraper (scraping plate) or a magnet (plate-like magnet) can be used. The scraping means 4 is attached so as to span in the width direction of the pair of left and right endless chain belts 3, and only one is attached to a predetermined portion of the endless chain belt 3. The position at which the scraping means 4 is attached to the endless chain belt 3 is the lower side in the conveying direction of the endless chain belt 3, and the lower side of the rising inclined portion 2b and the side wall side 2c of the main body 2a of the settling tank 2 It moves to the upper side along. That is, it is necessary to be provided at least on the lower side of the endless chain belt 3 between the drive shaft J1 and the driven shaft J2. In this embodiment, the limit switch LS on the drive shaft J1 side connects the driven shaft J2. The start position (front stop position) St1 of the scraping means 4 is an upper position on the side wall side (right side in FIG. 1) 2c of the main body 2a, and the rear stop position is This is the position of the rear limit switch LS (right side in FIG. 1). Further, a guide member G for guiding the pair of left and right endless chain belts 3 to a predetermined range is provided.

  The supply pump 9 is arranged in a vertical posture so as to reach the vicinity of the bottom of the main body 2a of the settling tank 2. That is, since the scraping means 4 is not provided on the upper side 3b of the endless chain belt 3, such a space is used so that the supply pump 9 reaches the vicinity of the bottom of the sedimentation tank 2 in a vertical posture. Disposed in the coolant liquid. The supply pump 9 is a metering pump that is sent to the machine tool. The supply pump 9 is a motor-driven system and is provided with a suction port on the lower side.

  Here, the scraping means 2 is detachably attached to the chain conveyor 3. In order to reciprocate, if a plurality of them are provided at a predetermined interval, not only the load due to the coolant liquid is increased and convection is generated, but also the distance for transporting the accumulated chips is increased (the reciprocating operation is performed so that it is scraped up). Because there is a need to secure the distance between the means), only one is necessary.

Next, operation | movement of the apparatus 1 of this Embodiment is demonstrated.
First, the coolant liquid containing chips discharged from the machine tool is filtered by the filtering device 6 disposed above the settling tank 2, and relatively large chips are discharged into the waste box 5A.

  The coolant liquid from which relatively large chips are removed is sent from the filtration device 6 to the sedimentation tank 2. Therefore, relatively fine chips S gradually accumulate on the bottom of the settling tank 2. For this reason, when the driving means M1 is driven to drive the conveying means 3 (forward movement), the scraping means 4 reaches the bottom of the sedimentation tank 2 from the start position St1, and then toward the rising inclined portion 2b. Although it rises diagonally, the chips S are discharged from the discharge port 7 in the middle of the rising slope 2b. When ejected, the conveyance shaft is driven to the position where the drive shaft J1 is folded back (the position of the limit switch LS), but the limit switch LS detects the stop position St2 and temporarily stops the drive motor M1. Then, when the driving means M1 is rotated in the reverse direction after a predetermined time, the conveying means 3 moves to a backward operation, reaches the bottom so as to go down the rising slope 2b of the settling tank 2, and then reaches the main body 2a. Are driven toward the side surface portion 2c and stopped at the start position St1 near the upper position of the side wall portion 2c. Such reciprocating operation is repeated at a predetermined time, or is reciprocated only when a certain amount of chips is accumulated.

Here, it is also possible to attach a sensor for detecting the accumulation state to the bottom of the sedimentation tank 2 so that the conveying means 3 is operated when the chips S are accumulated to some extent.
Further, the scraping means 4 is reciprocated at a predetermined time interval, but it stops for a while at the forward stop position (front limit switch LS position) St2, and after the wave of the coolant liquid has converged, the conveying means. 3 may be controlled so as to return slowly to the original start position St1. By controlling the drive in this way, it is possible to achieve a clean design and to reduce power consumption as much as possible. In addition, the flow of the settling tank 2 does not go in a certain direction as in the prior art, and the liquid temperature does not easily rise.
In the stop position of the start position St1 of the scraping means 4, the scraping means 4 is cleaned by the cleaning device using the stop time, or the detachable scraping means (scraper) 4 is replaced. You can also. Further, as the cleaning means, a jet type cleaning means is preferable. This cleaning means may have only one cleaning means corresponding to the single scraping means 4.

By the way, FIG. 5 and FIG. 6 are the comparative examples 11 for comparing with the apparatus of this Embodiment. In this comparative example 11, a plurality of scraping means 4 are attached to the conveying means 3 at predetermined intervals to cause the conveying means 3 to go around, and the upper side 3b of the endless chain belt 3 which is the conveying means 3 is also at the liquid level e. It is intended to sink in. However, because the height of the upper side 3a of the endless chain belt 3 is reduced in this way, the scraping means 4 is attached to the endless chain belt 3 at a predetermined interval. It cannot be arranged so as to be deeply submerged in the bottom of the settling tank 2. 3 and 4 show the relationship between the effective capacity of the sedimentation tank 2 (capacity that can be properly used in the sedimentation tank 2) h1 and h2 and the arrangement position (height position) of the supply pump 9. FIG. Yes.
On the other hand, according to the apparatus 1 of the present embodiment, the upper side 3b of the endless chain belt which is the conveying means 3 is above the liquid level e, and the number of the scraping means 4 is also one. Therefore, also from these points, power consumption for driving the pair of endless chain belts 3 can be suppressed. The power consumption can be suppressed to about 1/10 in comparison with Comparative Example 11, although it depends on the operation time. Further, the supply pump 9 of the present embodiment is a device of the type in which the conventional endless chain belt 3 is disposed, and differs from the device 11 that has to be disposed near the coolant level e. In the embodiment, since the effective capacity h1 of the sedimentation tank 2 is ensured by submerging deeply (in Comparative Example 11, in order to ensure the effective capacity of the sedimentation tank 2 as in Example apparatus 1, the liquid level e needs to be increased, and therefore, a large sedimentation tank 2 is required.), and the function can be sufficiently exerted, and thereby the overall height of the apparatus 1 of the present embodiment. Can be made lower than that of Comparative Example 11 and contribute to downsizing of the apparatus.

  As described above, the present invention is not limited to the above-described embodiment, and may be implemented by, for example, improving a conventional scraper-type conveyor or a magnet-type conveyor and changing the number of reciprocating drives, the number of scrapers, or the like. Is possible. Further, the rising inclined portion 2b of the sedimentation tank 2 is formed on the left and right sides, and the rising inclined portion 2b is pushed up and discharged from the discharge port 7 in both cases of the reciprocating movement and the backward movement of the scraping means 4. You can also. Thus, the present invention is not limited to the above embodiment.

1 Coolant purification device,
2 sedimentation tank, 2a rising slope part, 2b bottom part 2c side wall part (side wall side),
3 Conveying means (endless conveyor, endless chain belt),
3a Lower side of the conveying means, 3b Upper side of the conveying means,
4 Scraping means (scraper),
5A, 5B waste box,
6 Filtration device,
7 outlet,
9 Supply pump,
LS detection means (limit switch),
S Chips

Claims (4)

Comprising a sedimentation tank for flowing a coolant liquid contaminated with ejected chip from the machine tool, a piling means scraped cuttings deposited on the bottom of the settling tank, a conveying means for transporting the unit scooped, the The conveying means is a pair of left and right endless chain belts, the scraping means is attached between the pair, and the scraping means is attached only to the lower side of the endless chain belt, the scraping means A supply pump for supplying the coolant liquid to the machine tool is arranged close to the bottom of the settling tank using the space above the endless chain conveyor to which no slag is attached. A coolant purifying apparatus, wherein chips are discharged by reciprocating to a predetermined discharge port at a time interval.   The sedimentation tank is composed of a rectangular parallelepiped main body portion and a rising inclined portion that rises and inclines toward the discharge port, and the scraping means is at least from the rectangular parallelepiped main body portion to the discharge port of the rising inclined portion. The coolant purifier according to claim 1, wherein the coolant is reciprocated.   The reciprocating motion is switched according to a detection result by the detection means and a detection means for detecting a reverse arrival position of the scraping means. Coolant purification equipment. A sedimentation tank for injecting coolant liquid mixed with chips discharged from the machine tool, a scraping means for scraping chips accumulated on the bottom surface of the sedimentation tank, an endless conveyor for transporting the scraping means, and a sedimentation A rising slope portion in which a discharge port is formed in the middle of the slope that rises continuously in the tank, the scraping means is attached only to the lower side of the endless conveyor, and the scraping means is attached A supply pump for supplying the coolant liquid to the machine tool is arranged close to the bottom of the settling tank using the space above the endless chain conveyor, and the endless conveyor reciprocates at predetermined time intervals. The scraping means is reciprocated to the discharge port to discharge the chips, and after discharging, return to the original position and wait. A method of removing the deposited chips.

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