JP2012183613A - Coolant treating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coolant treating apparatus suppressed in a loss of a coolant.SOLUTION: The coolant treating apparatus 100 sorts chips out of the coolant by a sorting conveyor 10a and drops them from an outlet 4. There is provided a deposit plate 31 below the conveying end point a1 of the sorting conveyor 10a for receiving the falling chips including coolant contained therein and depositing them. The deposit plate 31 is swingingly supported by a pivot shaft 32. When the weight of the chips deposited on the deposit plate exceeds a predetermined value, the centroid of the deposit plate 31 is shifted from the original location while turning around the pivot shaft 32, and bringing the chips thereon to be fallen down. When the centroid thereof returns to the original point, the deposit plate 31 returns to an original attitude.

Description

The present invention relates to a coolant processing apparatus that receives coolant (hereinafter referred to as dirty coolant) mixed with foreign matters (chips) such as metal discharged from a machine tool and separates the chips such as metal from the coolant.

In machine tools, coolant (water or oil) is used to cool cutting tools, grinding tools, work materials, and the like and reduce friction. There already exists a coolant processing apparatus that introduces dirty coolant discharged from a machine tool from an inlet of a conveyor case, sorts chips from the dirty coolant by a sorting conveyor, and sends out the chips from the outlet. In this coolant processing apparatus, in order to improve the recyclability of the coolant, it is required that the coolant is not mixed as much as possible in the chips taken out from the discharge port.

In the techniques of Patent Documents 1 and 2, a liquid removal platform that is slightly inclined toward the processing tank is provided at the end where foreign matters such as chips are scraped up from the processing tank along the discharge gradient by a scraper. While the powder or sludge is primarily staying on the table for liquid removal, liquid removal is performed by returning the liquid contained in the sludge such as chips to the treatment tank using an inclination angle. Similarly to Patent Documents 1 and 2, the technique of Patent Document 3 is also used for primary retention on a table for liquid removal. However, since the rotation direction of the scraper is different, the scraps are scraped off from the table for liquid removal. The configuration is added.
Further, in the techniques of Patent Documents 1 to 3, the chips are collected and the liquid contained therein is drained so that the liquid is naturally dropped by using an inclination. The technique of Patent Document 4 is a compressed air. The liquid drainage is performed using. That is, in Patent Document 4, the drain liquid is dropped on a filtration belt for liquid removal, and the liquid component is separated through the filtration belt with compressed air.

Further, in the technique of Patent Document 5, the scraper is moved in the same rotational direction as that of Patent Document 3, but unlike the Patent Document 3, the scraper is not transported on the conveyor but is disposed in the transport path. The screen is transported while being dragged with a scraper. Then, dehydration is performed using the inclination of the screen during the conveyance.

Japanese Patent No. 2795581 JP 2009-45562 A JP 2006-26838 A JP 2008-289994 A JP 2010-173021 A

If the chips containing coolant are accumulated and a liquid draining time is provided, the coolant collects and becomes easy to drain, and the liquid is drained without using another power called compressed air used in the technique of Patent Document 4. Is possible. Therefore, according to the techniques of Patent Documents 1 to 3, it is desirable in terms of cost and equipment to promote drainage by primarily retaining chips.

When using the techniques of Patent Documents 1 and 2, the old chips accumulated on the table are pushed by the new chips carried on the table for liquid removal by the scraper. Before the new chips.

On the other hand, the techniques of Patent Documents 3 and 5 are different from the techniques of Patent Documents 1 and 2 in the rotation direction of the scraper. In Patent Document 3, when the scraper is reversed on the drive wheel side, the falling chips are temporarily accumulated on a dewatering stand and screened from the discharge port by a swing plate. Although the coolant returns to the conveyor case from the gap between the dewatering platform and the swing plate, a problem occurs if chips are caught in this gap. Furthermore, since the dewatering stand is continuous with the conveyor case, the chips once transported and collected on the dewatering stand may return to the conveyor case.

In the techniques of Patent Documents 3 and 5, since the scraper exceeds the driving wheel, when coolant is dripped from the scraper or the side chain, it leaks from the discharge port and causes loss of the coolant.

The present invention was devised in consideration of the above-described circumstances, that is, a coolant processing apparatus capable of efficiently recycling coolant and suppressing discharge due to clogging of chips. The purpose is to provide.

In the coolant processing apparatus for introducing the coolant containing the chips of the present invention into the conveyor case from the inlet and dropping the chips from the coolant by the sorting conveyor, the transporting end point of the sorting conveyor on the bottom surface having a downward slope Receiving and depositing the chips falling from the bottom and the coolant contained therein, and depositing a dish having a through hole through which the coolant passes downstream of the bottom surface of the descending slope, and swinging the deposition dish in a direction crossing the descending slope A fulcrum shaft that can be supported, and a restricting member that restricts swinging of the stacking plate around one direction so that the gradient of the bottom surface of the stacking plate is in a downward gradient toward the through hole, When the center of gravity exceeds the fulcrum shaft by the chips and coolant that are received and deposited on the accumulation pan, the rotation rotates in the direction opposite to the swinging direction limited by the restriction member. To drop the chips, the center of gravity position is changed by the loss of sediment characterized by a return to the limited posture by the restriction member.

According to the present invention, during the period in which the accumulation tray maintains the basic posture, the coolant contained in the chips accumulated on the accumulation tray can be collected through the through holes. On the other hand, during the swinging period until the stacking dish starts to swing again, the angle of the stacking dish 31 changes abruptly, so the accumulated chips are dropped at once. For this reason, the chips that have clogged the through-holes can be dragged to other chips by a sharp change in angle or shaken off by centrifugal force and removed. Further, since the swing of the stacking dish is exclusively due to gravity center movement, it is not necessary to provide a special drive mechanism.

The coolant processing apparatus which concerns on this invention is shown, A is a partial sectional view in side view, and B is a partial sectional view in plan view. It is a side view expanded sectional view which shows the return side of the said coolant processing apparatus. It is a plane view expansion explanatory drawing which shows the return side of the said coolant processing apparatus. A part of the coolant processing apparatus is shown. A is an enlarged perspective view of dewatering and B is an enlarged perspective view of a weir. It is side view operation | movement explanatory drawing which shows the principal part of the said coolant processing apparatus.

FIG. 1 shows a coolant processing apparatus 100 according to the present embodiment. In the figure, A is a side view and B is a plan view. The coolant processing apparatus 100 receives dirty coolant at the input port 20 and discharges chips and a relatively small amount of coolant contained in the discharge port 4 provided at a position higher than the coolant level in the conveyor case 10. To do.

Formed inside the conveyor case 10 is a sorting conveyor 10a that sorts chips from dirty coolant and conveys the chips to a conveyance end point a1 in the vicinity of the discharge port 4. The sorting conveyor 10a includes a mechanism for moving the scraper 13 along a fixed path by power, and a screen 14 for roughing chips from the dirty coolant.

Endless side chains 12 are provided along the left and right walls of the conveyor case 10, respectively. The left and right side chains 12 circulate between a driven wheel 11 provided on the tail end T side of the conveyor case 10 and a drive wheel 6 provided on the return R side. The path of the side chain 12 from the return R side to the tail end T side is positioned below the path from the tail end T side to the return R side. The side chain 12 rotates clockwise as indicated by an arrow C in FIG. A large number of scrapers 13 are mounted between the left and right side chains 12 at equal intervals, and the side chain 12, the driven wheel 11, and the driving wheel 6 constitute a conveyor drive mechanism. With this configuration, the scraper 13 descends from the top to the bottom on the drive wheel 6 side, and rises from the bottom to the top on the driven wheel side 11.

Immediately below the path through which the side chain 12 returns from the driven wheel 11 to the driving wheel 6, a screen 14 made of a perforated plate (such as a punched steel plate) having many holes extending along the return R side is provided from the side chain 12. It is provided in a state where a constant interval is maintained. The diameter of each hole of the screen 14 is about 3 to 5 mm. The screen 14 is provided between the inlet 20 and the outlet 4 so as to divide the conveyor case 10 into upper and lower stages, and covers the entire area of the conveyor case 10 as long as it does not interfere with the running of the scraper 13. It may be provided. Further, the holes of the screen 14 are desirably provided in the entire region immediately above the coolant level in the conveyor case 10, and are provided in the entire region from the inlet 20 to the outlet 4. In addition, you may provide only in the location facing the insertion port 20. FIG.

The scraper 13 has wiper blades 13a and 13b above and below with the side chain 12 interposed therebetween. When traveling on the bottom side of the conveyor case 10, the outer wiper blade 13 b sweeps the bottom surface, and when traveling on the screen side, the inner wiper blade 13 a scrapes off the chips on the screen 14. The wiper blade 13b on the outer peripheral side is not in contact with the bottom surface of the conveyor case 10, but is in a state where a gap is open and sweeps through the coolant. Both wiper blades 13a and 13b have their respective wipe surfaces perpendicular to the traveling direction of the side chain 12. In addition, a holding plate 13c is provided between the wiper blades 13a and 13b in a direction opposite to the traveling direction of the side chain 12, and the scraper 13 has a T-shape in side view as a whole. .

The conveyor case 10 storing the coolant can be separated into four regions T, W, D, and R in the length direction. A region T is a tail end where the driven wheel 11 is provided. In this range, the side chain 12 is folded and the scraper 13 is raised. A return plate b1 having an arc drawn from the bottom surface of the conveyor case 10 is provided so as to follow this. The wiper blade 13b on the outer peripheral side scoops up the chips at the bottom of the conveyor case 10 while in contact with the return plate b1.
A region indicated by W in FIG. 1 is a region that receives coolant containing chips from the machine tool. In this region W, the side chain 12 travels horizontally with respect to the coolant level in the conveyor case 10. The area W is an area where chips are horizontally conveyed and is a longer area than other areas. Since the multiple holes of the screen 14 are provided in almost the entire area W, the dirty coolant received from the machine tool is introduced into the lower stage of the conveyor case 10 from other places even if the holes at a certain place are clogged. . In addition, the clogging is eliminated by the scraper 13 that always operates.

A position P near the boundary between the region T and the region W is the start point of the screen 14. The chips held by the wiper blade 13b in the region T fall on the screen 14 in the subsequent traveling process because the wiper blade 13b stands upright at the position P.

A region indicated by D in FIG. 1 is a portion where the side chain 12 is raised at an angle θ1 with respect to the horizontal. The coolant level of the conveyor case 10 is a level that allows the screen 14 to be immersed even when it is full (if the coolant is reduced due to natural disappearance, the level below the screen 14). In the region D, the screen 14 is wiped by the wiper blade 13a. The upper chips are pulled up from the coolant. Then, while moving in this region, the coolant adhering to the chips through the holes of the screen 14 travels along the gradient of the screen 14 or falls to the lower stage of the conveyor case 10 through the multiple holes. Thus, since the path | route which returns from the driven wheel 11 to the driving wheel 6 is made into the coolant level surface, chips can be immediately pulled up from the coolant level from the coolant level. Therefore, the distance until the chips are discharged from the discharge port 4 can be shortened by a distance corresponding to the upper and lower intervals of the side chain 12 than when the chips are lifted from the bottom of the coolant. Further, when the coolant amount itself decreases due to natural disappearance or the like, the screen 14 in the region W appears from the coolant level, and therefore, the range of the region W can also be used for coolant separation from the chips.

The region R is a return region where the drive wheels 6 are provided, and is a region where chips on the screen 14 are dropped from the discharge port 4 and discharged. The scraper 13 follows a downward trajectory by the drive wheels 6. Reference numeral 32 denotes a shaft case of the drive wheel 6, which is moved to the left and right in FIG. 1 by an adjusting screw 32 a. Thereby, the tension of the side chain 12 is adjusted. In the region R, a liquid removal apparatus 101 is further provided below the drive wheels 6.

FIG. 2 is an enlarged cross-sectional view for explaining the inside of the return side. The screen 14 is continuous with the screen 14a having a gradient with an angle θ2 smaller than the gradient angle θ1. The screen 14a is formed of a non-perforated flat plate (a flat plate having a large number of holes may be used), and is substantially the same as the dewatering base 21 in Patent Document 1 (see FIG. 1 of Japanese Patent No. 2795581). It functions. The screen 14 a extends beyond the shaft 7 of the drive wheel 6 to a position where it does not interfere with the movement of the scraper 13 fed by the drive wheel 6. The chips on the screen 14a are pushed and moved to the tip of the screen 14a, which is the transfer end point a1 of the sorting conveyor 10a, by the movement of the scraper 13, and thereafter fall naturally.

Chips dropped from the tip of the screen 14a by the scraper 13 fall through the discharge port 4 opened below the drive wheel 6 and are taken out of the conveyor case. In the figure, reference numerals 21 and 22 denote guides for guiding the side chain 12. The guide 22 guides the side chain 12 with the angle θ1 also on the screen 14a.

Next, the liquid removal apparatus 101 will be described. As shown in FIG. 2, the liquid removal apparatus 101 includes a stacking tray 31 that receives chips and coolant contained in the falling end point a1 of the sorting conveyor 10a, and a fulcrum shaft that supports the stacking tray 31 so that its posture can be changed. 32, a bowl 33 that receives the coolant that has fallen from the accumulation tray 31, and a liquid passage 34 that causes the coolant that has flowed into the bowl 33 to flow into the conveyor case 10.

FIG. 3 is a plan view of the stacking plate 31, and FIG. 4 is a perspective view. The accumulation dish 31 surrounds a bottom surface portion 35 having a downwardly inclined surface with an end surface portion 36b and a side surface portion 36a which are provided upright from the downstream of the downwardly inclined surface, and is provided with a recessed portion. In the present embodiment, the upper surface of the bottom surface portion 35 is inclined downward along the direction toward the tail end T side. A weir 37 is raised from the middle of the bottom portion 35. Here, the “up” and “down” directions of the vertical gradient of the stacking plate 31 are directions when the stacking plate 31 described later is in the basic posture.

In FIG. 4B, the weir 37 is formed of a flat plate, and the lower side 37a is brought into contact with the upper surface of the bottom surface portion 35, and the upper edge 37c is fixed in a state of falling on the end surface portion 36b. A large number of small grooves 37b reaching from one surface to the other surface are formed in the lower side 37a of the weir 37, and each groove 37b becomes a through hole e1 through which coolant passes between the lower side 37a of the weir 37 and the bottom surface portion 35. The width and height of each through hole e1 are such that the chips do not pass through.

A region 31a on the upside of the weir 37 among the recessed portions of the accumulation dish 31 is a portion for receiving chips and coolant contained in the end point a1. When the accumulation pan 31 is in the basic posture as shown by a solid line in FIG. 2, the coolant adhering to the chips existing in the region 31a flows down the bottom surface portion 35 and the weir 37 and then passes through the through hole e1. Move into 31b. The region 31b is a region for collecting coolant. A through hole f1 is formed following the gradient of the bottom surface portion 35, and the coolant in the region 31b flows out through the through hole f1.

The fulcrum shaft 32 is fixed horizontally to the conveyor case 10, and a cylindrical member 38 is externally fitted to the fulcrum shaft 32 so as to be freely swingable in the circumferential direction. The cylindrical member 38 is fixed to the lower surface of the bottom surface portion 35 of the accumulation dish 31 in a direction crossing the gradient of the bottom surface portion 35. The positions of the fulcrum shaft 32 and the cylinder member 38 with respect to the bottom surface portion 35 are diagrams around the fulcrum axis with the center of gravity exceeding the fulcrum shaft 32 when the weight of the chips accumulated on the accumulation tray 31 exceeds the planned size. It is determined to rotate in the middle clockwise direction, drop the chips into the container g, and return to the original basic posture again. The cylindrical member 38 is positioned so as not to be covered with the bottom surface portion 35 when viewed from directly above the stacking plate 31, and the chips falling from the conveyance end point a <b> 1 enter the gap between the fulcrum shaft 32 and the cylindrical member 38. I try not to fall down directly.

The swing range of the stacking plate 31 around the fulcrum shaft 32 is limited by two limiting members 39a and 39b. One limiting member 39a maintains the basic posture of the stacking plate 31, is fixed to the conveyor case 10, receives the lower surface of the bottom surface portion 35 on the tail end T side with respect to the fulcrum shaft 32, and moves in the arrow direction h2 (FIG. (Counterclockwise rotation) is restricted. The other restricting member 39b is stopped before the position of the center of gravity in the state in which the accumulation plate 31 rotates too much in the arrow direction h1 (clockwise in the drawing) and the accumulation is lost does not return to the left side of the fulcrum shaft 32 in the drawing. is there. The flange 33 has a semicircular cross section, receives coolant that has dropped through the through hole f1 from above, and is connected to the liquid passage 34 via the joint 40. The liquid passage 34 has a flow gradient that allows the coolant in the basket 33 to naturally flow down into the conveyor case 10.

Next, the operation of the main part will be described.
In FIG. 1, when dirty coolant is introduced from the inlet 20, chips are captured on the screen 14. This is scraped off by the wiper blade 13a to the transport end point a1 on the return R side and dropped from the discharge port 4. Of the chips in the coolant that have fallen on the screen 14, chips below the opening of the holes in the screen 14 pass through the screen 14 and fall to the lower stage. The wiper blade 13a of the scraper 13 moves to the return R side while scraping off chips on the screen 14.

FIG. 5 is a diagram for explaining the operation on the return R side. When the scraper 13 rises on the screen 14 together with the chips and reaches the region R, the guide 22 guides the chain 12 with the angle θ1 also on the screen 14a. Therefore, above the screen 14a with the gradient 14a having a small angle θ2. Chips fall off the scraper 13 and are deposited on the screen 14a. The chips previously deposited on the screen 14a in this way move toward the conveyance end point a1 which is newly pressed by the chips conveyed on the screen 14a by the scraper 13. During this time, the coolant contained in the chips flows down the screens 14 and 14a as shown by arrows C and returns to the coolant reservoir in the conveyor case 10 (FIG. 5A).

The chips that have moved up the screen 14a and reached the position beyond the drive shaft 7 are pushed out by the scraper 13 to the newly conveyed chips later, or the scraper 13 being reversed by the drive wheels 6 It contacts the wiper blade 13a and is dropped from the conveyance end point a1 (FIG. 5B).
In this way, the chips falling from the conveyance end point a1 are sequentially deposited on the accumulation tray 31. As the amount of chips accumulated on the accumulation dish 31 increases, the center of gravity of the total weight of the accumulation dish 31 and the chips accumulated on the accumulation dish 31 gradually moves in a direction beyond the fulcrum shaft 32. When the center of gravity exceeds the fulcrum shaft 32, the stacking plate 31 starts to swing from the basic posture in the arrow direction h1 around the fulcrum shaft 32. When this swinging is started, the center of gravity of the stacking plate 31 further exceeds the fulcrum shaft 32, and the swinging speed of the stacking plate 31 increases at once. For this reason, the chips accumulated on the accumulation dish 31 slide down rapidly and fall into the container g (FIG. 5C). After this drop, the center of gravity of all weights acting on the stacking plate 31 moves to the left in the figure from the fulcrum shaft 32, and the stacking plate 31 is returned to the basic posture. Such a series of operations of the accumulation tray 31 is repeated during a period in which the chips fall from the conveyance end point a1.

During the period in which the accumulation tray 31 maintains the basic posture, the coolant contained in the chips accumulated on the accumulation tray 31 passes through the through hole e1, reaches the region 31b, and further passes through the through hole f1. Falls to the heel 33. Thus, the coolant that has reached the inside of the trough 33 naturally flows down to the conveyor case 10 through the liquid passage 34. Thereby, the consumption of the coolant in the conveyor case 10 is effectively suppressed, and the coolant recovered by the liquid removal device 101 is immediately and effectively used.

On the other hand, since the angle of the accumulation tray 31 changes sharply during the oscillation period until the accumulation tray 31 starts to swing again, the accumulated chips can be dropped at once. Therefore, the chips that clog the through hole e1 can be dragged by other chips by a sharp change in angle, or shaken off by centrifugal force and removed. In addition, chips that remain due to an impact when the stacking plate 31 collides with the regulating member 39b can be removed more efficiently.

In the swinging period, if the swinging period is set shorter than the period in which the next scraper conveys the chips, the loss of coolant during this period can be reduced.

In the above embodiment, the basket 33 is disposed away from the stacking dish 31, but the stacking dish 31 and the flow path 34 may be communicated using a flexible pipe instead of the pot 33.

4 Discharge Port 10 Conveyor Case 10a Sorting Conveyor 20 Input Port 31 Stacking Plate 32 Supporting Point Shaft 33 Shaft 34 Liquid Path 35 Bottom Surface 36a Side Surface 36b End Surface 37 Weir 100 Coolant Processing Device

Claims (3)

Coolant containing chips from machine tools is introduced into the conveyor case from the inlet of the conveyor case, and the chips are pulled up by a large number of scrapers that circulate in the conveyor case between the return side and the tail end side. In the coolant processing device that discharges from the return side discharge port provided at a position higher than the coolant level in the conveyor case,
It has a through hole that is disposed on the return side, receives and accumulates chips falling from the scraper and coolant contained in the bottom surface having a downward slope, and allows the coolant to pass downstream of the bottom surface of the downward slope. A stacking dish,
A fulcrum shaft that oscillates the stacking plate in a direction crossing the descending slope;
A limiting member that restricts swinging of the stacking dish around one direction so that the slope of the bottom surface of the stacking dish is in a downward slope toward the through hole,
When the center of gravity exceeds the fulcrum shaft by the chips and coolant that are received and deposited on the accumulation dish, the chips rotate by rotating in the opposite direction of the swinging direction limited by the limiting member, A coolant processing apparatus, wherein the center of gravity position is changed due to loss of deposits, and the posture is restricted by the restriction member.
The coolant processing apparatus of Claim 1 WHEREIN: The scissors which receive the coolant which flowed out through the said small hole from the said depositing plate are spaced apart and provided in the lower side of the said depositing plate, The coolant processing apparatus characterized by the above-mentioned.
2. The coolant treatment apparatus according to claim 1, wherein when the stacking dish swings with the swarf and coolant deposited on the stacking dish and the center of gravity exceeds the fulcrum axis, the limit is imposed on the swinging stacking dish. A coolant processing apparatus further comprising a member.