CN107984289A - A kind of chip removal device and chip removal method - Google Patents

Abstract

The invention discloses a kind of chip removal device and chip removal method, wherein, chip removal device includes feed liquor plate, deflector, transmission mechanism, grounding box and reflux mechanism；Deflector is arranged at one side-lower of feed liquor plate, and bottom surface is provided with several liquid flow holes；Transmission mechanism includes sequentially connected rotary electric machine, driving shaft, driving wheel, chain, driven wheel and driven shaft, multiple hairbrush and a scraper plate is provided with chain, grounding box is located at below deflector, and upper end is provided with accommodating chamber；Reflux mechanism includes water pump and return tank, and return tank is provided with a back cavity, and back cavity is connected with accommodating chamber and a filter plate is provided therebetween.So that during chip removal, it can strengthen the filter effect of cutting swarf by the highly dense property bristle of hairbrush, small cutting swarf is taken away by hairbrush, big cutting swarf is then discharged by scraper plate, scraper plate and hairbrush are used cooperatively, first the filter effect of chip removal device is enhanced, stuck probability is second reduced, improves security.

Description

A kind of chip removal device and chip removal method

Technical field

The present invention relates to the chip removal device of process equipment, more particularly to a kind of chip removal device and chip removal method.

Background technology

In the process such as metal milling, ceramic milling, wet type processing is a kind of common processing method.In general, machine Bed can constantly produce cutting swarf in process, and cutting swarf can be mixed in cutting fluid and be expelled to chip removal device, chip removal dress The separation of cutting swarf and cutting fluid will be carried out by putting, so that cutting swarf be discharged, and is recycled cutting fluid and is recycled.

In the prior art, chip removal device is usually by casing, main driving wheel group, from driving wheel group, transmission scraper plate and chip leading plate Composition, in main driving wheel group and from dregs guiding groove is provided between driving wheel group, dust lead trough floor is provided with the bottom of dregs guiding groove, Transmission scraper plate is uniformly installed every a distance in the upper and lower surface of dust lead trough floor, is provided with inwardly in the both sides of dregs guiding groove The inclined chip leading plate in side, the both ends for transmitting scraper plate are mounted on the transmission chain of its both sides by contiguous block, decelerating motor Drive the transmission scraper plate being connected with transmission chain to convey cutting swarf to crumb mouth to discharge.

Using transmission scraper plate export cutting swarf, there are following two problems：1st, scraper plate is made for hard material, scrapes It is stuck that cutting swarf is easily cut bits（Cutting swarf is stuck between scraper plate and dust lead groove bottom, scraper plate is not moved）, it is dangerous Height, needs maintenance and repair rate high；2nd, in order to reduce the probability that is stuck of scraper plate, the spacing between scraper plate and dust lead groove bottom must be big In certain value, the cutting swarf that height is less than the value is caused not separate, chip removal effect is poor.

As it can be seen that the prior art has yet to be improved and developed.

The content of the invention

In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of chip removal device and chip removal method, purport Solving the problems, such as that transmission scraper plate chip removal effect is poor in the prior art.

Technical scheme is as follows：

A kind of chip removal device, wherein, including feed liquor plate, deflector, transmission mechanism, grounding box and reflux mechanism；The deflector One side-lower of feed liquor plate is arranged at, and deflector bottom surface is provided with a fluid flow area, if being provided with the fluid flow area Dry liquid flow hole；The transmission mechanism is arranged at the deflector, it includes sequentially connected rotary electric machine, driving shaft, active Wheel, chain, driven wheel and driven shaft, are provided with multiple hairbrush and at least one scraper plate on the chain；The grounding box is located at Below the deflector, and grounding box upper end is provided with an accommodating chamber；The reflux mechanism includes water pump and return tank, described time Stream case is provided with a back cavity, and the back cavity is connected with the accommodating chamber and a filter plate is provided therebetween.

Further, the hairbrush includes brush board and bristle, and the brush board is fixed between two chains, on the bristle The brush board lower face is fixed at end, and the length of bristle is more than the minimum range between bristle and deflector bottom surface.

Further, the deflector, which tilts, is fixed on grounding box, and deflector first end is fixed with grounding box first end to be connected Connect, second end is suspended on outside grounding box；The accommodating chamber is used to house deflector first end lower part, and accepts and cutting swarf point Cutting fluid from after.

Further, the feed liquor plate is provided with a lead channel, and the cutting fluid with cutting swarf is flowed to through lead channel to be led Flowing plate.

Further, the feed liquor plate is made of bottom plate, the first side plate, the second side plate and the 3rd side plate, first side Bending forms vertically upward by the bottom plate for plate, the second side plate and the 3rd side plate；Shape between first side plate and the second side plate Into there is the first inlet, then formed with the second inlet between the first side plate and the 3rd side plate, the second side plate and the 3rd side plate it Between formed with liquid outlet, first inlet and the second inlet be located at first side of lead channel, the liquid outlet is located at Second side of lead channel.

Further, the rotary electric machine is fixed on the outside of the deflector second end, and the deflector is provided with one and wears Open-work, the driving shaft are connected to rotary electric machine after running through the through hole.

Further, the driving wheel, chain and driven wheel are all provided with two, and multiple hairbrush and a scraper plate interval are consolidated Due between two chains.

Further, the reflux mechanism is located on the outside of the grounding box second end.

Further, the grounding box is fixedly connected with multiple scroll wheels, and the scroll wheel is used to drive grounding box to move.

A kind of chip removal method realized by chip removal device as described above, wherein, the chip removal method includes the following steps：

The cutting fluid for being mixed with cutting swarf flows to deflector by feed liquor plate；

Transmission mechanism drives multiple hairbrush and a scraper plate cycle rotation, and big cutting swarf and small is driven from deflector bottom surface first end Cutting swarf is moved to second end, until big cutting swarf and small cutting swarf are discharged by deflector second end opening, while cutting fluid Accommodating chamber is flowed downward to by the liquid flow hole in fluid flow area；

Under the twitch of water pump, the cutting fluid in accommodating chamber flows to the back cavity in return tank after filter plate.

Compared with prior art, chip removal device provided by the invention, including feed liquor plate, deflector, transmission mechanism, grounding box And reflux mechanism；The deflector is arranged at one side-lower of feed liquor plate, and deflector bottom surface is provided with a fluid flow area, institute State and several liquid flow holes are provided with fluid flow area；The transmission mechanism is arranged at the deflector, it includes sequentially connected Rotary electric machine, driving shaft, driving wheel, chain, driven wheel and driven shaft, are provided with multiple hairbrush on the chain and one are scraped Plate, the hairbrush are used to separating and conveying the small cutting swarf being mixed in cutting fluid, and the scraper plate is used to separate and convey mixing In the big cutting swarf in cutting fluid；The grounding box is located at below the deflector, and grounding box upper end is provided with an accommodating chamber； The reflux mechanism includes water pump and return tank, and the return tank is provided with a back cavity, the back cavity and the accommodating chamber It is connected and a filter plate is provided therebetween.So that chip removal device when filtering out cutting swarf, can pass through the highly dense of hairbrush Collection property bristle strengthens the filter effect of cutting swarf, by the less cutting swarf of quality（Cutting swarf is substantially similar scrap, for example is all Metal fillings, quality is smaller to mean small volume）Taken away by hairbrush, and the larger cutting swarf of quality is then by being provided only with one A scraper plate is separated and conveyed, and scraper plate and hairbrush are used cooperatively, and is first enhanced the filter effect of chip removal device, is second reduced Stuck probability, improves security.In addition, the filter plate set between back cavity and accommodating chamber may filter that and be drop to cutting fluid The cutting swarf of accommodating chamber, further increases filter effect.

Brief description of the drawings

Fig. 1 is the structure diagram of the preferred embodiment of chip removal device in the present invention.

Fig. 2 be chip removal device of the present invention preferred embodiment in feed liquor plate structure diagram.

Fig. 3 be chip removal device of the present invention preferred embodiment in transmission mechanism structure diagram.

Fig. 4 is the enlarged drawing of part A in Fig. 3.

Fig. 5 is the enlarged drawing of part B in Fig. 3.

Fig. 6 is the enlarged drawing of Local C in Fig. 3.

Fig. 7 be chip removal device of the present invention preferred embodiment in grounding box structure diagram.

Fig. 8 is the enlarged drawing of part D in Fig. 7.

Fig. 9 is the enlarged drawing of part E in Fig. 7.

Embodiment

The present invention provides a kind of chip removal device and chip removal method, to make the purpose of the present invention, technical solution and effect more It is clear, clear and definite, referring to the drawings and give an actual example that the present invention is described in more detail.It should be appreciated that tool described herein Body embodiment only to explain the present invention, is not intended to limit the present invention.

As shown in Figure 1, chip removal device provided by the present invention, including feed liquor plate 100, grounding box 200, deflector 300 and Flow back mechanism 400, and the feed liquor plate 100 is fixed on the top of grounding box 200, its liquid outlet is located at the top of deflector 300, return current machine The position of structure 400 can be set at an arbitrary position, as long as ensureing that the cutting fluid after being separated with cutting swarf can recycle.

The feed liquor plate 100 can be fixed on 200 upper surface of grounding box, can also be fixed on ground, preferably the first side Case, is fixed on 200 upper surface of grounding box by feed liquor plate 100 and is more advantageous to saving chip removal device space.

As shown in Fig. 2, it is preferred that the feed liquor plate 100 is made of a bottom plate 110 and three side plates；The bottom plate 110 is in L Type, is made of bottom long slab 111 and bottom short slab 112, and short slab 112 second side in bottom is located at deflector 300 away from 111 side of bottom long slab Top, as cutting fluid（It is mixed with the cutting fluid of cutting swarf）Liquid outlet uses, 111 first side of bottom long slab and 112 phase of bottom short slab Connect, the second side has been extended the first side plate 120.

First side plate 120 is made of one first side long slab 121 and two the first side short slabs 122, the first side long slab 121 Set along 111 second side of bottom long slab, two the first side short slabs 122 are formed by the bending of 121 both ends of the first side long slab and perpendicular to the Side long slab 121, the first side long slab 121 and the first side short slab 122 are all perpendicular to bottom plate 110.

The bottom plate 110 has extended vertically the second side plate 130 upwards, second side plate 130 by set gradually second Side short slab 131, the second side long slab 132 and the 3rd side short slab 133 form；Second side short slab 131 is parallel to the first side short slab 122, and deviate from 112 one end of bottom short slab positioned at 110 first ends of bottom plate, that is, bottom long slab 111；Second side long slab 132 is along bottom long slab 111 second sides are set；The 3rd side short slab 133 is in a rectangular trapezoid, it is located at bottom short slab 112 and deviates from 110 second end of bottom plate.

110 second end of bottom plate is provided with the 3rd side plate 140（It is opposite with the second side short slab 131）, the 3rd side plate 140 points are rectangle part and trapezoidal portions, and rectangle part is extended by the lateral middle part of bottom long slab 111 first, and trapezoidal portions are then There is rectangle part to be extended to 112 second side of bottom short slab.

It is preferred that the feed liquor plate 100 is formed by a complete plate by bending, i.e., on unshaped plate bending go out Side plate 120, the second side plate 130 and the 3rd side plate 140, then remainder is bottom plate 110.It is of course also possible to use connection Mode be molded feed liquor plate 100, for example the first side plate 120, the second side plate 130 and the 3rd side plate 140 of machine-shaping are distinguished It is fixedly connected on 110 upper surface of bottom plate.But this molding easy leak of structure of connection, effect are poor with respect to bending and molding.

In addition, it should be noted that feed liquor plate 100 is provided with two inlets, the first inlet is located at two the first sides Between one of short slab 122 and the second side short slab 131, the second inlet is positioned at another and the 3rd side of two the first side short slabs 122 Between plate 140, second inlet and liquid outlet（I.e. the second side of short slab is surrounded by the 3rd side short slab 133 with the 3rd side plate 140 Into opening）Straight line communicates.

It should be noted that during the description of feed liquor plate 100, end has visibly different implication with side, is beaten with L-shaped Analogy, is up and down end, left and right is side.

The deflector 300 is seen in concave character type by second end, and in hollow in terms of first end, middle part longitudinal section is in character cut in bas-relief Shape.Deflector 300 is a straight panel, and relative to ground case 200 is obliquely installed for it, and the angle between grounding box 200 is in 5 ° extremely 45 °, preferably selection is 15 °.For the high inclination-angle tilted in the prior art between body and lower part body, the present invention In small inclination the discharge of cutting swarf can be made more smoothly, be suitable for the setting of hairbrush.Why say and more adapt to hairbrush Set, be that the present invention is using hair because the prior art is all that cutting swarf is isolated from cutting fluid using scraper plate and is taken away Brush, for scraper plate, the dynamics smaller that hairbrush puts on cutting swarf is softer, if inclination angle is excessive, it will cause cutting swarf It can not be pulled away.

As shown in Figures 3 to 6, a transmission mechanism is provided with the deflector 300, the transmission mechanism includes connecting successively A rotary electric machine 510,520, two, a driving shaft, 540, two driven wheels 550 and one of chain of driving wheel 530, two connect are driven Axis 560.The rotary electric machine 510 is fixed on the outside of 300 second end of deflector, the side of the left and right sides of deflector 300 A through hole is all provided with plate, 520 both ends of driving shaft are set through the through hole, and wherein through hole is run through in one end The shaft with rotary electric machine 510 is connected afterwards, and two driving wheels 530 are sheathed on the both ends outer rim of the driving shaft 520, chain respectively 540 adaptations are connected to the structure and driving wheel 530 and driving shaft 520 of the driving wheel 530, driven wheel 550 and driven shaft 560 Identical, difference is that driven wheel 550 and driven shaft 560 are fixedly installed on 300 first end of deflector, and driven wheel 550 does not connect Connect rotary electric machine 510.Certainly, driven wheel 550 can also connect another rotary electric machine 510, keep two rotary electric machines 510 synchronous Rotation.

Multiple hairbrush 580 are fixedly installed on the chain 540, the hairbrush 580 is used to isolate from cutting fluid small Cutting swarf, and drive small cutting swarf to move, until small cutting swarf is discharged by 300 second end of deflector.Small cutting swarf refers to quality Cutting swarf smaller, that hairbrush 580 can drive；Conversely, the cutting swarf that hairbrush 580 can not drive is big cutting swarf.The prior art The separation and drive of middle cutting swarf are all completed by scraper plate 590, compared to hairbrush 580 of the present invention, scraper plate 590 have following defect：1st, scraper plate 590 is made for hard material, scrape cutting swarf be easily cut bits it is stuck（Cutting swarf It is stuck between 300 bottom surface of scraper plate 590 and deflector, scraper plate 590 is not moved）, it is dangerous high, need maintenance and repair rate high；2、 In order to reduce the probability that is stuck of scraper plate 590, the spacing between 300 bottom surface of scraper plate 590 and deflector have to be larger than certain value, make Being less than the cutting swarf of the value into height can not separate, and chip removal effect is poor.The above on the contrary is to use the institute of hairbrush 580 The effect brought, it is safe, fragile rate is low and chip removal effect is good.

The hairbrush 580 includes brush board and bristle, and the brush board is fixed between two chains 540, the bristle upper end The brush board lower face is fixed on, and the length of bristle is more than the minimum range between 300 bottom surface of bristle and deflector.Why Bristle lengths are set as described above, being to improve the service life of hairbrush, bristle is had certain wear allowance, i.e., in bristle After a period of time, it can still ensure the separation conveying capacity to small cutting swarf.

In the present invention further preferred embodiment, a scraper plate 590, the scraper plate are further fixed on the chain 540 590 are used to isolate big cutting swarf out of cutting fluid, and drive big cutting swarf to move, until big cutting swarf is by deflector 300 the Discharge at two ends.Although 590 chip removal effect of scraper plate is poor and fragile rate is high, it is mingled with multiple hairbrush 580 using a scraper plate 590, can but play the effect for looking into scarce mending-leakage, i.e., by hairbrush 580 can not separated cutting swarf, scraper plate 590 can be from cutting Separated in bits；Hairbrush 580 and scraper plate 590 are used cooperatively, and can making chip removal device, not only draining effect is more preferable, but also rapid wear Rate is relatively low.

300 bottom surface of deflector is provided through multiple liquid flow holes, and multiple liquid flow holes are all located in the fluid flow area, The fluid flow area is located at 300 middle and lower part of deflector, and the length of whole fluid flow area is about the 40% of 300 length of deflector. The liquid flow hole is used to discharge the cutting fluid after being separated with cutting swarf to the accommodating chamber 210 of the grounding box 200.Liquid flow hole is optional Select and path liquid flow hole is set, to prevent cutting swarf before not separated with cutting fluid, enter accommodating chamber 210 with cutting fluid.

In the present invention further preferred embodiment, the lower section of chain 540 is fixed with a raised strip, the protrusion Strip lower face fits in deflector 300, and upper surface is bonded and supports the chain 540, to substitute the setting of tensioning wheel.

200 upper end of grounding box is provided with an accommodating chamber 210, and the accommodating chamber 210 is used to accept to be separated with cutting swarf Cutting fluid afterwards, and house 300 first end lower part of deflector.The accommodating chamber 210 is communicated with a turn of tidal stream chamber, and the turn of tidal stream chamber connects Logical reflux mechanism 400.

The 200 first end upper surface of grounding box is provided with connecting hole 231, and the connecting hole 231 is used to connect described lead 300 first end of flowing plate, that is to say, that the position of 300 first end of deflector and 200 first end of grounding box is identical or intimate phase With, this is highly beneficial for saving chip removal device occupied space.The 200 second end upper surface of grounding box is provided with solid Determine hole 232, the mounting hole 232 is used to be connected hole 231 with the fixation deflector 300, it should be noted that, deflector 300 second ends are not identical with the second end position of ground terminal, and 300 second end of deflector need to stretch out grounding box 200 simultaneously vacantly, so Cutting swarf could be drained into another chip removal device or cutting catcher（Such as collecting vessel）.

The 200 both ends end face of grounding box is respectively fixed with a link, and the link is L-shaped, and link is by mutually hanging down The first straight connecting plate and the second connecting plate form, and two end plates and two reinforcing ribs are fixed between two connecting plates.It is described First connecting plate is bonded and is fixed on 300 end face of deflector, is vertically and fixedly provided with leader thereon.Second connecting plate and ground It is parallel, two bases and two rotating wheels are fixed with below, and the middle of the base is round table-like in hollow, and outer rim has been extended Sealing strip, when being positioned over ground（Or platform）Afterwards, hollow core portion is fastened on ground and forms an annular seal space, which can be with shape Into adsorption capacity, the shelf-stability of increase grounding box 200.Base upper end offers a through hole, and bolt is worn upwards from base bottom Second connecting plate is fixed on after crossing through hole, screw portion is fixed on the second connecting plate by two nuts, and bolt head plays While connection function, the sealing function of annular seal space is also acted as.The rotating wheel is used for when needing chip removal device to need mobile Rotate, reduce chip removal device moving resistance, be provided with lockup switch, the lockup switch needs steadily to put in chip removal device Pushed when putting it is locked, when chip removal device needs shift position on lift and open.

As shown in Figure 7 to 9, the reflux mechanism 400 includes：Water pump 420 and return tank 410, the water pump 420 are fixed In return tank 410, the return tank 410 is provided with a back cavity, and the back cavity connects and the two it with the accommodating chamber 210 Between be provided with a filter plate.Specifically, the back cavity is directly connected with the turn of tidal stream chamber, with 210 indirect communication of accommodating chamber. Preferably, return tank 410 is arranged to a part for grounding box 200, to strengthen the flowing leakproofness of cutting fluid, prevents liquid Leakage.

In the present invention further preferred embodiment, the reflux mechanism 400 is located at outside 200 second end of grounding box Side.

In the present invention, the cutting fluid with cutting swarf flows to deflector 300 through feed liquor plate 100, and cutting fluid is through liquid stream Hole gradually flows to accommodating chamber 210, and simultaneously, under the drive of transmission mechanism, hairbrush 580 and scraper plate 590 are suitable with chain 540 Hour hands rotate, and drive the cutting swarf in cutting fluid gradually to be moved from 300 first end of deflector to 300 second end of deflector, until Discharged from the opening of 300 second end of deflector；After the water pump 420 in the mechanism 400 that flows back starts, the cutting in accommodating chamber 210 Liquid will flow to second end by 210 first end of accommodating chamber, then into turn of tidal stream chamber, finally enter return tank 410, make to circulate With.

Compared with prior art, chip removal device provided by the invention, it is right by multiple hairbrush, a scraper plate and filter plate Cutting swarf is successively filtered three times, greatly improves the filter effect of cutting swarf.

Present invention also offers a kind of chip removal method realized by chip removal device as described above, it includes the following steps：

The cutting fluid for being mixed with cutting swarf flows to deflector by feed liquor plate, specifically as described in above-mentioned device embodiment；

Transmission mechanism drives multiple hairbrush and a scraper plate cycle rotation, and big cutting swarf and small is driven from deflector bottom surface first end Cutting swarf is moved to second end, until big cutting swarf and small cutting swarf are discharged by deflector second end opening, while cutting fluid Accommodating chamber is flowed downward to by the liquid flow hole in fluid flow area, specifically as described in above-mentioned device embodiment；

Under the twitch of water pump, the cutting fluid in accommodating chamber flows to the back cavity in return tank after filter plate, specifically as above State described in device embodiment.

It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can To be improved or converted according to the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention Protect scope.

Claims (10)

1. a kind of chip removal device, it is characterised in that including feed liquor plate, deflector, transmission mechanism, grounding box and reflux mechanism；Institute State deflector and be arranged at one side-lower of feed liquor plate, and deflector bottom surface is provided with a fluid flow area, in the fluid flow area It is provided with several liquid flow holes；The transmission mechanism is arranged at the deflector, and transmission mechanism includes sequentially connected rotation electricity Machine, driving shaft, driving wheel, chain, driven wheel and driven shaft, are provided with multiple hairbrush and at least one scraper plate on the chain； The grounding box is located at below the deflector, and grounding box upper end is provided with an accommodating chamber；The reflux mechanism includes water pump And return tank, the return tank are provided with a back cavity, the back cavity is connected with the accommodating chamber and sets therebetween There is a filter plate.

2. chip removal device according to claim 1, it is characterised in that the hairbrush includes brush board and bristle, the brush board It is fixed between two chains, the brush board lower face is fixed in the bristle upper end, and the length of bristle is more than bristle with leading Minimum range between flowing plate bottom surface.

3. chip removal device according to claim 1, it is characterised in that the deflector, which tilts, is fixed on grounding box, water conservancy diversion Plate first end is fixedly connected with grounding box first end, and second end is suspended on outside grounding box；The accommodating chamber is used to house deflector First end lower part, and accept the cutting fluid after being separated with cutting swarf.

4. chip removal device according to claim 1, it is characterised in that the feed liquor plate is provided with a lead channel, with cutting The cutting fluid of swarf flows to deflector through lead channel.

5. chip removal device according to claim 4, it is characterised in that the feed liquor plate is by bottom plate, the first side plate, the second side Plate and the 3rd side plate composition, bending forms vertically upward by the bottom plate for first side plate, the second side plate and the 3rd side plate；Institute State between the first side plate and the second side plate formed with the first inlet, between the first side plate and the 3rd side plate then formed with second into Liquid mouth, formed with liquid outlet between the second side plate and the 3rd side plate, first inlet and the second inlet positioned at it is described into The first side of liquid bath, the liquid outlet are located at second side of lead channel.

6. chip removal device according to claim 1, it is characterised in that the rotary electric machine is fixed on the deflector second End outside, the deflector are provided with a through hole, and the driving shaft is connected to rotary electric machine after running through the through hole.

7. chip removal device according to claim 1, it is characterised in that the driving wheel, chain and driven wheel are all provided with Two, multiple hairbrush and a scraper plate interval are fixed between two chains.

8. chip removal device according to claim 1, it is characterised in that the reflux mechanism is located at the grounding box second end Outside.

9. chip removal device according to claim 1, it is characterised in that the grounding box is fixedly connected with multiple scroll wheels, The scroll wheel is used to drive grounding box to move.

A kind of 10. chip removal method realized by the chip removal device as described in any one in claim 1 to 9, it is characterised in that The chip removal method includes the following steps：

The cutting fluid for being mixed with cutting swarf flows to deflector by feed liquor plate；

Transmission mechanism drives multiple hairbrush and a scraper plate cycle rotation, and big cutting swarf and small is driven from deflector bottom surface first end Cutting swarf is moved to second end, until big cutting swarf and small cutting swarf are discharged by deflector second end opening, while cutting fluid Accommodating chamber is flowed downward to by the liquid flow hole in fluid flow area；

Under the twitch of water pump, the cutting fluid in accommodating chamber flows to the back cavity in return tank after filter plate.