CN114654021A - Cutting tool - Google Patents

Abstract

The invention discloses a cutting tool, comprising: a base including a fluid cavity containing a fluid; the operating platform is arranged on the base; a cutting mechanism including a drive member and a cutting member, the drive member driving the cutting member to rotate about a first axis, the cutting member at least partially protruding through the console; the cutting member has an entering area and a disengaging area on a rotating path of the cutting member, wherein the entering area refers to the rotating path of the cutting member entering fluid and rotating to a lower limit position, and the disengaging area refers to the rotating path of the cutting member rotating to a disengaging fluid from the lower limit position; the blocking mechanism is arranged at the axial end part of the cutting piece in the fluid cavity along the direction which is approximately perpendicular to the first axis; the blocking mechanism covers at least the cutting member at the disengagement zone, the axial projection extending across a vertical centerline of the cutting member and towards the entry zone, the axial projection extending upwardly across a horizontal centerline of the cutting member.

Description

Cutting tool

Technical Field

The invention relates to an electric tool, in particular to a cutting tool.

Background

Conventional cutting tools comprise a cutting member capable of cutting a workpiece, which cutting member generates heat that becomes hot during cutting, and a table on which a cooling fluid is usually provided for cooling the cutting member, in order to avoid overheating of the cutting member, in which the cutting member is partially immersed, during cutting operation, the cutting member rotates and takes away heat through the cooling fluid,

in the use process of the cutting tool 100, because the cutting member 220 rotates at a high speed, the cooling liquid in the fluid cavity 111 is easy to be taken away, and the cooling liquid is splashed under the action of centrifugal force in the process of being driven away by the cutting member 220, on one hand, the splashing of the cooling liquid pollutes the working environment, and the thrown cooling liquid cannot be recycled, so that the use efficiency of the cooling liquid is low, and the frequent addition of the cooling liquid is needed, which is not beneficial to improving the use experience of users; on the other hand, the splashed cooling liquid and cutting chips are mixed to easily pollute the surface of the workpiece to shield the cutting line, so that the operation sight of a user is influenced, and the cutting precision is influenced.

In order to solve the problems, the baffle or the lug boss which partially encloses and blocks the cutting piece is arranged at the two axial ends of the cutting piece in the fluid cavity at present so as to slow down the splashing phenomenon when cooling liquid is taken away from the liquid surface, the phenomenon of splashing can be only slightly slowed down by the mode, and the effect is not obvious.

Disclosure of Invention

The invention adopts the following technical scheme:

a cutting tool, comprising:

a base including a fluid cavity containing a fluid;

the operating platform is arranged on the base;

a cutting mechanism including a drive member and a cutting member, the drive member driving the cutting member to rotate about a first axis, the cutting member at least partially protruding through the console;

the cutting member has an entering area and a disengaging area on a rotating path of the cutting member, wherein the entering area refers to the rotating path of the cutting member entering fluid and rotating to a lower limit position, and the disengaging area refers to the rotating path of the cutting member rotating to a disengaging fluid from the lower limit position;

the blocking mechanism is arranged at the axial end part of the cutting piece in the fluid cavity along the direction which is approximately perpendicular to the first axis;

the blocking mechanism at least covers the cutting member in the disengagement zone, the axial projection extends across a vertical centerline of the cutting member and towards the entry zone, and the axial projection extends upwardly across a horizontal centerline of the cutting member.

Further, the length of the axial projection covering the cutting piece along the horizontal direction is L, the height of the axial projection covering the cutting piece along the vertical direction is H, the diameter of the cutting piece is D, L/D is greater than or equal to 2/3, and H/D is greater than or equal to 2/3.

Furthermore, the horizontal distance of the blocking mechanism in the entry area is delta L, and the delta L/D is more than or equal to 1/6; and the vertical distance between the top of the blocking mechanism and the rotation center is delta H, and the delta H/D is not less than 1/6.

Further, the axial clearance between the inner surface of the blocking mechanism and the cutting piece is g1 ', the radius of the cutting piece is r, and then 1/20 is not less than g 1'/r is not less than 1/8.

Further, the cutting device also comprises a flow limiting surface arranged on the inner surface of the blocking mechanism, and the axial clearance between the flow limiting surface and the cutting piece is smaller than the axial clearance between the inner surface of the blocking mechanism and the cutting piece.

Further, the axial clearance between the flow limiting surface and the cutting piece is g2, and g2 is more than 0 and less than or equal to 8 mm.

Furthermore, the cutting device also comprises a flow blocking part arranged on the inner surface of the blocking mechanism, and the flow blocking part and the rotating direction of the cutting part are arranged at one or more angles.

Furthermore, the blocking mechanism is pivoted or inserted with the fluid cavity.

Further, the cutting tool also comprises a radial drainage unit, the radial drainage unit is arranged in the fluid cavity and at least comprises a drainage curved surface arranged around the periphery of the cutting part, and the drainage curved surface is basically positioned on a circumference taking the axis of the cutting part as a central line; the blocking mechanism is arranged on the axial outer side of the radial drainage unit.

The cutting tool further comprises a drainage cover, the drainage cover is connected with the fluid cavity and arranged in the fluid cavity, the drainage cover comprises a circumferential shell main shell arranged around the periphery of the cutting piece, and the circumferential shell main shell comprises a drainage curved surface basically positioned on a circumference which takes the axis of the cutting piece as a central line; the blocking mechanism is arranged on the axial outer side of the radial drainage unit.

The invention has the advantages that: the blocking mechanism is arranged at the axial end part of the cutting piece in the fluid cavity, so that the blocking mechanism at least covers the cutting piece positioned in the separation area, the axial projection of the blocking mechanism crosses the vertical central line of the cutting piece and extends towards the entry area, and the axial projection crosses the horizontal central line of the cutting piece and extends upwards. On the one hand, the coolant liquid driven by the rotation of the cutting part is limited to generate large-scale splashing, the utilization rate of the coolant liquid is improved, the coolant liquid is prevented from being frequently added by a user, and the environmental pollution caused by splashing of the coolant liquid is also avoided. On the other hand, the cooling liquid is guided to move in the space limited between the blocking mechanism and the cutting piece, and the cooling effect of the cutting piece is further improved.

Drawings

Fig. 1 is a schematic view of the structure of the cutting tool of the present invention.

Fig. 2 is a schematic view of the cutting tool according to the embodiment of the present invention with the operation table removed.

Fig. 3 is a sectional view a-a of the cutting tool of fig. 2.

Fig. 4 is a schematic view of the cutting tool of fig. 2 with the fluid chamber broken away.

Fig. 5 is a schematic view of the cutting tool of fig. 4 with the cutting element removed.

Fig. 6 is a sectional view B-B of the cutting device of fig. 5.

Fig. 7 is a schematic view of the cutting tool according to the embodiment of the present invention with the operation table removed.

Fig. 8 is a schematic view of the assembly of the cutting element and the drainage mask of the cutting tool of fig. 7.

FIG. 9 is a front view of the cutting element of the cutting tool of FIG. 8 assembled with a drain cover.

Fig. 10 is a schematic view of the structure of the drainage mask of the cutting tool of fig. 7.

FIG. 11 is a schematic view of another angular configuration of the drainage mask of the cutting tool of FIG. 7.

Fig. 12 is a schematic view of the cutting tool according to the embodiment of the present invention with the operation table removed.

Fig. 13 is a C-C cross-sectional view of the cutting tool of fig. 12.

Fig. 14 is a schematic view of a blocking mechanism of the cutting tool of fig. 12.

Fig. 15 is a right side view of the blocking mechanism of fig. 14.

Fig. 16 is a left side view of the blocking mechanism of fig. 14.

Fig. 17 is a schematic view of the cutting tool according to the embodiment of the present invention with the operation table removed.

Fig. 18 is a schematic view of the cutting tool according to the embodiment of the present invention with the operation table removed.

Description of reference numerals:

100-a cutting tool;

110-a base; 111-a fluid chamber; 111 a-bottom wall; 111 b-side wall; 111 b' -a support wall; 112-a mounting chamber; 114-a weep hole; 115-planar boss; 116-mounting bosses;

120-an operation table; 121-opening;

210-a driver;

220-a cutting member; 221-center of rotation; 222-vertical centerline; 223-horizontal centerline;

230-a shield;

310-a radial drainage unit; 311-drainage curved surface;

320-an axial drainage unit; 321-a drainage plane;

341-first ribs; 342-a second bead;

350-an agitation unit;

360-a flow blocking unit;

400-a switch assembly;

500-a drainage cover; 501-a leading-in end; 502-a lead-out terminal;

510-a main housing portion; 511-circumferential drainage unit;

520-a shaft housing portion; 521-an axial drainage unit;

531 — first bump; 532-second bump;

540-opening;

560-a connecting portion;

600-a barrier mechanism; 611-card slot; 612-a securing lug; 613-latch;

620-top side; 630-entering an edge; 640-a connecting edge; 650-flow limiting surface; 660-flow blocker.

Detailed Description

As shown in fig. 1, a cutting tool 100 of the present invention, the cutting tool 100 is embodied as a tile cutting machine, which can be used for cutting tiles, marble, granite, etc. Wherein the cutting tool 100 includes a base 110, a table 120, and a cutting mechanism.

As shown in fig. 1-2, the cutting tool 100 further comprises a switch assembly 400 and a control assembly (not shown in the drawings), wherein the control assembly is used for controlling the operation of the cutting tool 100, and the switch assembly 400 is respectively connected with the driving member 210 and the control assembly to control the start and stop of the driving member 210.

As shown in fig. 2, a mounting chamber 112 and a fluid chamber 111 are disposed in the base 110, wherein the fluid chamber 111 is used for containing a cooling fluid, a drainage hole 114 for discharging the fluid is disposed at the bottom of the fluid chamber 111, and a funnel-shaped drainage design is disposed around the drainage hole 114 to facilitate smooth discharge of the internal fluid. In this embodiment, the fluid chamber 111 and the mounting chamber 112 are both recessed cavities directly formed in the base 110, but the fluid chamber 111 may also be provided with a separate basin or housing, and is connected and fixed with the base 110.

As shown in fig. 1, a table 120 is disposed on the base 110 for placing a workpiece for a user to perform a cutting operation, the table 120 covers an opening of the fluid chamber 111, and the table 120 is provided with an opening 121 for allowing at least a portion of the cutting member 220 to pass through. The upper half of the cutter 220 passes through the opening 121 and the lower half extends into the fluid chamber 111.

Referring to fig. 2, the cutting mechanism includes a driving member 210 and a cutting member 220, specifically, the driving member 210 is a motor disposed in the mounting chamber 112 in the base 110, and the cutting member 220 is a saw blade connected to the motor and driven by the motor to rotate. To ensure operator safety, the portion of the saw blade exposed above the table 120 is also covered with a shroud 230, as shown in fig. 1. The driving member 210 in this embodiment is driven by a power source, and the power source may be a dc power source or an ac power source, which is not limited herein.

Referring to fig. 4, the fluid chamber 111 includes a bottom wall 111a and a plurality of side walls 111b, the side walls 111b extend upward from the bottom wall 111a, the side walls 111b enclose the periphery of the fluid chamber 111, and the bottom wall 111a and all the side walls 111b together enclose the fluid chamber 111. The present embodiment includes four sidewalls 111b, and the four sidewalls 111b substantially surround the rectangular fluid chamber 111. Of course, the number of the side walls 111b is not limited to four, and the fluid chamber 111 enclosed therewith is not limited to a rectangular chamber.

As shown in fig. 3-5, the side wall 111b includes a supporting side wall 111b ', the supporting side wall 111b ' separates the fluid chamber 111 and the mounting chamber 112 in the base 110, the supporting side wall 111b ' is provided with a mounting hole for allowing the output shaft of the motor to pass through, and the cutting member 220 is mounted at the output shaft end of the motor and is located in the fluid chamber 111.

Wherein the fluid chamber 111 is used for containing a cooling fluid (not shown in the drawings) in which the cutting member 220 is partially immersed. In the present embodiment, water is used as the coolant. During cutting, the cutting member 220 may be cooled while being cleaned as it rotates past the cooling fluid, in other words, the cooling fluid in the fluid chamber 111 serves to cool the cutting member 220 and carry away cutting debris thereon.

Referring to fig. 3-6, an embodiment of the cutting tool of the present invention is shown, wherein the cutting tool 100 of this embodiment further comprises a fluid control mechanism, wherein the fluid control mechanism comprises a radial drainage unit 310. Wherein the radial drainage unit 310 is arranged in the fluid cavity 111, and the radial drainage unit 310 at least comprises a drainage surface arranged around the periphery of the cutting member 220, the fluid in the fluid cavity 111 flows along the drainage surface, and the drainage surface is arranged obliquely or in a bending way relative to the bottom wall of the fluid cavity 111.

The drainage surface may include an inclined surface disposed on the outer periphery of the cutting member 220 and inclined with respect to the bottom wall 111a of the fluid chamber, or may include a curved surface disposed on the outer periphery of the cutting member 220. Wherein the drainage surface in this embodiment is a drainage curve 311 disposed around the periphery of the cutting member 220, wherein the drainage curve 311 is substantially located on a circumference having the axis of the cutting member 220 as the center line. Of course, as an alternative embodiment, the curved drainage surface 311 may be provided with any other curvature.

Specifically, referring to fig. 3-6, the radial drainage unit 310 in this embodiment is a convex platform disposed in the fluid chamber 111, wherein the convex platform is an arc-shaped convex platform, the top of the arc-shaped convex platform has a curved surface configured as a drainage curved surface 311, wherein the drainage curved surface 311 is substantially a portion of a circumferential surface, and the drainage curved surface 311 is substantially coaxially disposed with the cutting member 220.

Wherein the curved drainage surface 311 extends from the bottom wall 111a toward the rotation direction of the cutting member 220, and the end of the curved drainage surface 311 is at least higher than the limit liquid level. Specifically, as shown in fig. 3, when the cutting element 220 in this embodiment rotates in the counterclockwise direction, the curved drainage surface 311 extends in the counterclockwise direction from the bottom wall 111a, and the curved drainage surface 311 extends along the periphery of the cutting element 220, so that on one hand, the coolant driven by the rotation of the cutting element 220 is limited to generate large-range splashing, and the utilization rate of the coolant is improved; on the other hand, the cooling liquid is guided to move in the space limited between the curved drainage surface 311 and the outer edge of the cutting member 220, and the cooling effect of the cutting member 220 is further improved.

Referring to FIG. 3, in order to further improve the drainage and splash-proof effects, the radial gap between the drainage curved surface 311 and the edge of the cutting member 220 in this embodiment is set to Δ d, and the radius of the cutting member 220 is r, so that 1/20 ≦ Δ d/r ≦ 1/9. Wherein 0 < deltad ≦ 10mm in the present embodiment, in particular the radial gap deltad may be set to 8 mm.

Through restricting the clearance between drainage curved surface 311 and cutting member 220 outer fringe at above-mentioned within range, both can ensure that the cooling performance of cutting member 220 also is favorable to reducing getting rid of coolant liquid and spattering to improve the utilization efficiency of coolant liquid, avoid the user frequently to add the coolant liquid, also avoid getting rid of because of the coolant liquid and spatter the environmental pollution who leads to.

Further, the curved flow-guiding surface 311 includes an inlet end and an outlet end, wherein the outlet end is disposed behind the inlet end in a counterclockwise direction, the inlet end of the curved flow-guiding surface 311 in this embodiment is immersed in the cooling liquid, and the outlet end is disposed to extend out of the cooling liquid.

Specifically, as shown in FIG. 6, the angle of the curved drainage surface 311 extending from the position right under the cutting member 220 to the rotation direction of the cutting member 220 is α, and α ≧ 70 °, such as 70 °, 90 °, 120 °, or the like. Thereby, the drainage curved surface can be ensured to conduct drainage and splash prevention effectively. Wherein it is understood that directly below the cutting member 220 refers to the lowest point through which the cutting member 220 rotates.

Through above-mentioned setting be favorable to smoothly effectively leading the coolant liquid in fluid chamber 111 into on the drainage curved surface 311 to along the clearance motion between drainage curved surface 311 and the cutting piece 220, ensured effectual cooling route simultaneously, further promoted the cooling of coolant liquid to the cutting piece and the splashproof of coolant liquid.

As shown in fig. 5 and 6, the fluid control mechanism further comprises an axial drainage unit 320, wherein the axial drainage unit 320 comprises a drainage plane 321 which is arranged on at least one axial side of the cutting element 220 at a distance from the cutting element 220. Wherein the axial clearance between the drainage plane 321 and the surface of the cutting element 220 is g1, then 1/20 is not less than g1/r is not less than 1/8, for example 1/11 is not less than g1/r is not less than 1/10. Thus, in this embodiment, the outer end faces of the planar bosses formed on the support side walls 111 b' constitute flow directing planes 321, the axial gap g1 between the flow directing planes 321 and the surface of the cutting element 220 being 0 < g1 ≦ 8mm, e.g., g1 of 8mm, 6mm, 5mm, 3mm, etc.

Specifically, as shown in fig. 6, in this embodiment, a flat boss 115 provided to protrude from the surface of the support sidewall 111b 'is provided on the support sidewall 111 b', and the outer end face of the flat boss 115 is provided parallel to the surface of the cutter 220 and constitutes one of the drainage planes 321. Further, the height of the planar projection 115 in this embodiment is h, and the radius of the cutting member 220 is r, 1/4 ≦ h/r ≦ 1, and for example, specifically 1/3 ≦ h/r ≦ 2/3 may be set. Thereby ensuring that the height or area of the two axial ends of the cutting element 220 through which the cooling fluid passes is effectively limited. Wherein the height h refers to the dimension of the planar projection 115 in a direction perpendicular to the bottom wall 111a, or the dimension of the planar projection 115 in a vertical direction.

Of course, as an alternative embodiment, a further drainage plane 321 can also be provided on the outside of the cutting element 220, wherein the support side wall 111 b' is located on the inside of the cutting element 220, and the other side of the cutting element 220 is the outside. For example, an auxiliary planar projection is provided on the outer side of the arcuate projection opposite to the support side wall 111 b', and the inner wall surface of the auxiliary planar projection on the side facing the cutting element 220 is configured as another flow-directing plane 321, or alternatively, a baffle may be provided on the outer side of the cutting element 220, and the inner wall surface of the baffle facing the cutting element 220 is configured as another flow-directing plane 321, and similarly, the axial gap g between the flow-directing plane 321 and the surface of the cutting element 220 satisfies 0 < g ≦ 8 mm; or g satisfies 1/20 ≦ g/r ≦ 1/8, e.g., 1/11 ≦ g/r ≦ 1/10. Likewise, the height of the auxiliary planar projection is h, which also satisfies 1/4 ≦ h/r ≦ 1, e.g., 1/3 ≦ h/r ≦ 2/3.

The axial end part of the cutting piece 220 is provided with the drainage plane 321, so that the splashing phenomenon of the cutting piece 220 in the cutting process along the axial direction can be further limited, the splashing prevention effect of the fluid control mechanism is further improved, and the use efficiency of the cooling liquid is further improved. Wherein generally axially refers to any direction other than radially along cutting member 220.

As shown in fig. 4, the fluid control mechanism in this embodiment further includes a flow blocking unit disposed on the radial flow guiding unit 310 and/or the axial flow guiding unit 320, the flow blocking unit is configured to block the coolant flow and reduce the coolant flow to reduce the splashing amount, a radial gap between the flow blocking unit and the cutting element 220 is smaller than a radial gap between the curved flow guiding surface 311 and the cutting element 220, and an axial gap between the flow blocking unit and the cutting element 220 is smaller than an axial gap between the flow guiding plane 321 and the cutting element 220. Specifically, in this embodiment, both the radial gap and the axial gap of the flow blocking unit and the cutter 220 are less than or equal to 6 mm.

Referring to fig. 4 to 5, the flow blocking unit may be ribs disposed on the radial flow guiding unit 310 and/or the axial flow guiding unit 320. For example, the flow blocking unit may include a first rib 341 disposed on the surface of the flow guiding curved surface 311, which is used to further reduce the radial water flow gap of the cutting element 220, wherein the first rib 341 is disposed on the flow guiding curved surface 311 in an axial direction of the cutting element 220. Alternatively, the flow blocking unit may also comprise ribs arranged on the axial flow guiding unit 320 for further reducing the axial flow gap of the cutting element 220. Alternatively, the choke unit may further include a second rib 342 disposed on the arc-shaped protrusion, wherein the second rib 342 is a U-shaped rib axially crossing the edge of the cutting element 220, a bottom arm thereof is formed on the curved drainage surface 311 of the arc-shaped protrusion, and two side walls thereof may be respectively formed on adjacent parts of the arc-shaped protrusion (for example, on the supporting side wall 111 b' or adjacent mounting seat or drainage plane). The U-shaped ribs may limit both the radial and axial flow gaps of the cutting member 220. Wherein in this embodiment, a first rib 341 and a second rib 342 are provided at the same time, and the first rib 341 and the second rib 341 are provided on the drainage curved surface 311 at intervals along the rotation direction of the cutting member 220. Of course, the number of the choke units is not limited to two, and may be set to any number.

Referring to fig. 4 to 5, the fluid control mechanism in this embodiment further includes an agitating unit 350 disposed on the radial flow guiding unit 310 and/or the axial flow guiding unit 320, wherein the agitating unit 350 is concavely disposed on the flow guiding curved surface 311 toward the radial outside of the flow guiding curved surface 311. Specifically, the turbulence unit 350 in this embodiment is a groove disposed on the curved drainage surface 311, and has a gradually shrinking opening, i.e. the opening size of the groove is larger than the size of the groove bottom, and the groove in this embodiment is a groove with an inverted triangle cross section. Through setting up the effect of stirring single unit 350, can restrict the velocity of flow of coolant liquid, further avoid the coolant liquid to get rid of and spatter. Of course, it is also possible to provide an agitator unit on the axial flow guide unit 320 or to provide an agitator unit 350 on both the radial flow guide unit 310 and the axial flow guide unit 320.

Referring to fig. 2 to 5, the fluid control mechanism further includes a blocking unit 360, wherein the blocking unit 360 is at least one soft blocking pad disposed downstream of the radial drainage unit 310, and a gap between the blocking unit 360 and the cutting element 220 is smaller than a gap between the blocking unit and the cutting element 220. Specifically, the blocking unit 360 may be a rubber pad, which may be independently fixed on a mounting seat in the fluid chamber 111, or may be fixed on a sidewall of the fluid chamber 111, and the downstream refers to the rear of the cutting member 220 along the rotation direction, wherein the soft blocking pad of this embodiment is disposed above the outflow end of the curved drainage surface 311, specifically, the cutting member 220 in the fluid chamber 111 is about to rotate out of the fluid chamber 111 to the position on the operation table 120. The last obstacle of the blocking unit 360 to the cooling liquid is used for finally controlling the amount of the cooling liquid screwed out along with the cutting piece 220, so that a large amount of splashing is avoided at the outlet of the cutting piece 220 on the operating table 120, the phenomenon that the cutting piece 220 rotates to bring out too much cooling liquid to cause the accumulation of the liquid on the operating table top is also avoided, and the phenomenon that a large amount of sewage is generated to shield the cutting line to influence the cutting precision is further avoided.

Referring to fig. 7 to 11, an embodiment of the cutting tool 100 of the present invention is shown, wherein the cutting tool 100 of the embodiment includes a drainage cover 500, wherein the drainage cover 500 is disposed around at least an outer circumference of the cutting element 220 immersed in the cooling fluid, and the drainage cover 500 is connected to an inner wall of the fluid chamber 111 or to the mounting boss 116 disposed in the fluid chamber 111, specifically, as shown in fig. 8 to 10, the drainage cover 500 includes a connection portion 560, and the connection portion 560 may be fixedly connected to the mounting boss 116 by, for example, a pin, a screw, or the like, or may be connected by a plug-in or snap-in manner.

Referring to fig. 8 to 11, the drainage cap 500 of this embodiment includes a main housing portion 510, wherein the main housing portion 510 is disposed in the fluid chamber 111, and the main housing portion 510 includes a main housing portion inner wall disposed along an outer edge of the cutting member 220, along which fluid can flow, the main housing portion inner wall being inclined or curved with respect to a bottom wall of the fluid chamber 111.

The main housing portion inner wall may include a slope inclined with respect to the fluid chamber bottom wall 111a, or include a curved surface that is curved. Wherein the inner wall of the main casing in this embodiment comprises a curved drainage surface 311, and the curved drainage surface 311 is substantially located on a circumference with the axis of the cutting member 220 as the center line. Of course, as an alternative embodiment, the curved drainage surface 311 may be provided with any other curvature.

By means of the arrangement, on one hand, the coolant driven by the cutting piece 220 to rotate is limited to be thrown and splashed in a large range, and the utilization rate of the coolant is improved; on the other hand, the cooling fluid is guided to move in the space defined between the fluid guide 510 and the outer edge of the cutting member 220, and the cooling effect of the cutting member 220 is further improved.

Specifically, referring to fig. 11, the inner wall of the main casing in the present embodiment is a curved surface and is configured as a circumferential flow guide unit 511, wherein the circumferential flow guide unit 511 is substantially a part of a circumferential surface, and the circumferential flow guide unit 511 is substantially coaxially disposed with the cutting member 220. In other words, the main housing 510 in this embodiment is a curved housing, i.e., is formed as a portion of the circumferential surface.

Of course, as an alternative embodiment, the main housing 510 is not limited to a curved housing, and may be any shape of main housing, such as: rectangle, trapezoidal, even irregular shape etc. only need satisfy this main shell portion inner wall include one around the circumference drainage unit that cutting member periphery set up can.

As shown in FIG. 9, in this embodiment, the circumferential drainage unit 511 in the drainage mask 500 extends substantially along the rotation direction of the cutting member 220, in this embodiment, when the cutting member 220 rotates counterclockwise in FIG. 9, the circumferential drainage unit 511 also extends counterclockwise, and if the angle of the circumferential drainage unit 511 extending along the rotation direction of the cutting member 220 is γ, γ ≧ 120 °, such as γ being 120 °, 150 °, and so on.

Further, referring to fig. 10, the draft shield 500 includes an inlet 501 and an outlet 502, wherein the inlet 501 is below a limit level and the outlet 502 is above the limit level. Specifically, when the fluid chamber 111 is provided with the lower limit level and the upper limit level, the lead-in end 501 of the draft shield 500 is lower than the lower limit level, thereby ensuring that the cooling fluid can smoothly enter the lead-in end 501, and the lead-out end 502 of the draft shield 500 is disposed higher than the upper limit level. It will be appreciated that this arrangement facilitates smooth and efficient introduction of the coolant in the fluid chamber 111 into the flow guide cover 510 and movement along the gap between the flow guide cover 510 and the cutting member 220, while ensuring an efficient cooling path; further, the cooling of the cutting piece by the cooling liquid and the splash prevention of the cooling liquid are improved.

With continued reference to FIG. 9, the main housing portion 510 in this embodiment extends from the lower extreme position of the cutting member 220 at an angle β opposite to the direction of rotation of the cutting member 220, such that β satisfies 15 ≦ β ≦ 35. Wherein, as shown in fig. 9, the cutting member 220 rotates in the counterclockwise direction, the drainage cover 500 extends clockwise from the lower limit position of the cutting member 220 by an angle beta, wherein, beta is more than or equal to 15 degrees and less than or equal to 35 degrees. Therefore, the cooling liquid can effectively enter the drainage cover 500 to cool the cutting piece 220 while the leading-in end 501 of the drainage cover 500 does not protrude out of the cooling liquid; it is also ensured that the cooling fluid entering the drain cover 500 can travel a sufficient cooling path to ensure a cooling effect on the cutting member 220.

In order to further improve the drainage and splash-proof effects, the radial gap between the circumferential drainage unit 511 formed by the inner wall of the main shell and the edge of the cutting piece 220 is set to be delta d ', the radius of the cutting piece 220 is r, and 1/20 is less than or equal to delta d'/r is less than or equal to 1/9.

Wherein in this embodiment 0 < Δ d '≦ 10mm, in particular the radial gap Δ d' may be set to 8 mm. Through the clearance restriction between with main shell portion 510 and cutting piece 220 outer fringe in above-mentioned within range, both can ensure that the cooling performance of cutting piece 220 also is favorable to reducing getting rid of coolant liquid and spattering to improve the utilization efficiency of coolant liquid, avoid the user frequently to add the coolant liquid, also avoid getting rid of because of the coolant liquid and spatter the environmental pollution who leads to.

As shown in fig. 8-11, the drainage cover 500 further includes a shaft housing part 520, wherein the shaft housing part 520 may be integrally formed with the main housing part 510, or may be separately assembled. Shaft housing portion 520 in this embodiment extends from the axial end of main housing portion 510 to the outside of the axial end of cutting element 220, it being understood that shaft housing portion 520 extends from the axial end of main housing portion 510 and partially covers the outside of the axial end of cutting element 220. In other words, the flow cap 500 shields not only the outer edge of the cutting member 220 that is immersed in the fluid but also a portion of the axial end of the cutting member 220.

Referring to FIG. 9, the shaft housing portion 520 in this embodiment extends from the main housing portion 510 to the axial end of the cutting element 220. if the radial dimension of the shaft housing portion 520 is s and the radius of the cutting element is r, 1/4 ≦ s/r ≦ 1/2, e.g., 1/4 ≦ s/r ≦ 1/3.

Referring to fig. 11, the shaft housing part 520 includes axial drainage units 521 provided at both axial sides of the cutting member 220 at intervals from the cutting member 220. In particular, in this embodiment, the inner wall of the shaft housing forms an axial flow-directing unit 521, wherein the axial gap between the axial flow-directing unit 521 and the surface of the cutting element 220 is g1 ', then 1/20. ltoreq.g 1 '/r. ltoreq. 1/8, for example 1/11. ltoreq.g 1 '/r. ltoreq. 1/10.

In this embodiment, the axial gap g1 'between the axial tapping unit 521 and the surface of the cutting element 220 satisfies 0 < g 1' ≦ 8 mm.

It will be appreciated that as an alternative embodiment, only one shaft housing 520 may be provided, in which case the shaft housing 520 is connected to the main housing 510 outside the cutting member 220, and the outer surface of the support side wall 111b 'inside the cutting member 220 is formed as an axial flow directing unit on the other side of the cutting member 220, or several planar projections are provided on the support side wall 111 b', a plane parallel to the surface of the cutting member 220 forming one of the axial flow directing units 521. Further, the height of the planar projection in this embodiment is h ', the radius of the cutting member 220 is r, 1/4 ≦ h '/r ≦ 1, and for example, 1/3 ≦ h '/r ≦ 2/3 may be specifically set.

The axial flow guide unit 521 is arranged on at least one side of the axial end part of the cutting piece 220, so that the splashing phenomenon in the axial direction in the cutting process can be further limited, the splashing prevention effect of the flow guide cover 500 is further improved, and the use efficiency of the cooling liquid is further improved. Wherein substantially axially splashing means splashing outwardly of the end face of the cutting element 220 in the axial direction of the cutting element 220 and at an angle to the axial direction of the cutting element 220.

The flow guide cover 500 in this embodiment further includes a flow blocking unit disposed on the inner wall of the main shell portion 510 and/or the shaft shell portion 520, the flow blocking unit is configured to block the coolant flow, and reduce the coolant flow to reduce the splashing amount, a radial gap between the flow blocking unit and the cutting element 220 is smaller than a radial gap between the circumferential flow guide unit 511 and the cutting element 220, and an axial gap between the flow blocking unit and the cutting element 220 is smaller than an axial gap between the axial flow guide unit 521 and the cutting element 220. Specifically, the radial gap and the axial gap between the flow blocking unit and the cutting element 220 in this embodiment are both less than or equal to 6 mm.

Referring to fig. 11, the flow blocking unit may be ribs and/or protrusions disposed on the main housing portion 510 and/or the shaft housing portion 520. For example, the flow blocking unit may include a first protrusion 531 provided at an inner surface of the shaft housing part 520 for further reducing the axial water flow gap of the cutter 220. Alternatively, the flow blocking unit may further include a second protrusion 532 disposed on an inner wall of the flow guide cover 500, wherein the second protrusion 532 is a U-shaped protrusion axially crossing an edge of the cutting member 220, a bottom wall thereof is formed on the main housing portion 510, and two sidewalls thereof are respectively formed on the shaft housing portion 520. The U-shaped protrusion may limit both the radial and axial water flow gaps of the cutter 220. Wherein a plurality of first and second protrusions 531 and 532 are simultaneously provided in the present embodiment, and the first and second protrusions 531 and 532 are spaced apart from each other.

Referring to fig. 11, the drainage cover 500 of the present embodiment further includes an opening 540 disposed on the main housing portion 510 and/or the shaft housing portion 520, wherein the opening 540 is used for draining and/or discharging dirt, wherein the draining is to allow cooling liquid to flow back into the fluid cavity 111 from the opening 540, and the discharging is to allow cutting chips or debris, such as porcelain mud, during cutting to flow out from the opening 540 and to be discharged into the fluid cavity 111, so that the cutting piece 220 is prevented from being locked due to the debris or chips, and the cutting piece 220 is ensured to operate normally.

Referring to fig. 7, the cutting apparatus 100 of the present embodiment also includes a flow blocking unit 360, wherein the flow blocking unit 360 is at least one soft blocking pad disposed at the outlet end of the main housing portion 510, and a gap between the flow blocking unit 360 and the cutting member 220 is smaller than a gap between the flow blocking unit and the cutting member 220. Specifically, the blocking unit 360 may be a rubber pad, which may be fixed on the mounting seat or on the sidewall of the fluid chamber 111, and the outlet end of the main housing 510 refers to the end of the cutting member 220 that is screwed out of the drainage housing 500. Wherein the soft baffle pad of this embodiment is transversely disposed at the outlet end of the draft shield 500. The blocking unit 360 is the last obstacle to the coolant, and is used to finally control the amount of coolant that is spun out along with the cutting member 220, so as to avoid the formation of a large amount of splashing and accumulation of liquid at the outlet of the cutting member 220 on the operating table 120, and also avoid the generation of a large amount of sewage to cover the cutting line and affect the cutting precision.

As shown in fig. 12 to 16, which are cutting devices according to an embodiment of the present invention, wherein the cutting member 220 is driven by the driving member to rotate around the first axis, the cutting member 220 has an entering area and a leaving area on its rotation path, specifically, the entering area refers to the rotation path between the cutting member 220 entering the cooling liquid and rotating to the lower limit position of the cutting member 220, and the leaving area refers to the rotation path from the lower limit position of the cutting member 220 to the leaving fluid; in other words, the rotation interval from the position where the cutting member 220 contacts the fluid and rotates to the deepest position where the cutting member is immersed in the cooling fluid is the entering area, and the rotation interval from the deepest position where the cutting member is immersed in the fluid to the position where the cutting member is separated from the cooling fluid is the separating area.

In this embodiment, the cutting tool 100 is further provided with a blocking mechanism 600, as shown in fig. 12-13, the blocking mechanism 600 being mounted to the axial end of the cutting member in the fluid chamber 111 in a direction substantially perpendicular to the first axis. Wherein the blocking means 600 has an axial projection in the direction of the first axis, which axial projection covers at least the centre of rotation 221 of the cutting member 220 and the cutting member 220 in the disengagement zone, see fig. 13.

Referring to fig. 13, in this embodiment, an axial projection of the blocking mechanism 600 extends across the vertical centerline 222 of the cutter 220 and toward the intake zone, and an axial projection of the blocking mechanism 600 extends upward across the horizontal centerline 223 of the cutter 220. Wherein vertical centerline 222 and horizontal centerline 223 are both centerlines on cutter 220 that pass through its center of rotation 221, with vertical centerline 222 being substantially perpendicular to the ground and horizontal centerline 223 being substantially parallel to the ground.

As shown in fig. 14-16, the blocking mechanism 600 in this embodiment is a baffle plate disposed in the fluid chamber 111 generally in a direction perpendicular to the first axis, wherein the blocking mechanism 600 includes a mounting portion for removable mounting in the fluid chamber 111.

As shown in fig. 12, specifically, the blocking mechanism 600 in this embodiment is pivotally connected to the base 110, the mounting portion includes a locking slot 611 and a fixing lug 612, which are disposed on the blocking mechanism 600, wherein the fixing lug 612 is disposed on the outer side of the disengagement area, i.e., the right side in fig. 13, the mounting boss 116 is provided with a connecting hole detachably connected to the fixing lug 612, and when mounting, the fixing lug 612 is pivotally connected to the mounting boss 116 through a pin, a pin shaft, or the like, so that the blocking mechanism 600 can rotate around the pin shaft in the fluid chamber 111.

As shown in fig. 13 and 16, a slot 611 is provided at the bottom of the blocking mechanism 600, and a pin 613 adapted to be inserted into the slot 611 is provided on the bottom wall 111a of the fluid chamber 111, and the pin 613 is inserted into the slot 611, thereby achieving easy fixing and opening of the blocking mechanism 600. Of course, the plug may be disposed on the blocking mechanism 600, and the slot may be disposed in the fluid chamber 111, which is not limited herein.

As an alternative embodiment, the blocking mechanism 600 may further be provided with a slot adapted to be connected to the blocking mechanism 600, and specifically, the inner wall and/or the mounting boss 116 of the fluid chamber 111 corresponding to the blocking mechanism 600 and/or the mounting boss 116 are respectively provided with a slot adapted to be connected to the blocking mechanism 600, the blocking mechanism 600 is provided with a pin adapted to be inserted into the slot, the blocking mechanism 600 is inserted into the fluid chamber 111 in the vertical direction, and the blocking mechanism 600 can be quickly mounted and dismounted by the connection and fixation of the pin and the slot. Of course, the positions of the plug and the slot may be interchanged, or the slot slidably connected to the side of the blocking mechanism 600 may be directly disposed in the fluid chamber 111, so long as the blocking mechanism 600 is inserted into the fluid chamber 111, and the structure is not limited herein.

Of course, as an alternative embodiment, the mounting portion 610 may be fixedly connected to the inner wall of the fluid chamber 111 by, for example, screws or bolts.

As shown in FIG. 13, the blocking mechanism 600 of this embodiment has an axial projection covering the cutting member 220 with a length L in the horizontal direction, an axial projection covering the cutting member 220 with a height H in the vertical direction, and a diameter D of the cutting member 220, so that L/D is 2/3 or more and H/D is 2/3 or more.

The horizontal distance of the axial projection of the blocking mechanism 600 in the entering area is delta L, and the delta L/D is more than or equal to 1/6; the vertical distance between the top of the blocking mechanism 600 and the rotation center 221 is Δ H, and Δ H/D is greater than or equal to 1/6.

It will be appreciated that the length L1 ≧ 2/3D in the horizontal direction of the blocking mechanism 600, while the top edge 620 is disposed higher than the center of rotation 221 of the cutting member 220 by a height Δ H1 ≧ 1/6D; the height H1 of the blocking mechanism 600 in the vertical direction is equal to or greater than 2/3D, while the entering edge 630 is located to the left of the center of rotation 221 of the cutter 220, and the distance Δ L1 between the entering edge 630 and the center of rotation 221 is equal to or greater than 1/6D. In other words, the top edge and the entry edge of the blocking mechanism 600 are both disposed beyond the center of rotation 221 of the cutter 220, and the top edge and the entry edge 630 are both greater than or equal to 1/6D beyond the center of rotation 221.

The blocking mechanism 600 may be a rectangular plate, a fan-shaped plate, or the like, or may be an irregular plate, and the above requirements are satisfied only by the condition that the axial projection of the blocking mechanism covers the cutting element 220.

The blocking mechanism 600 in this embodiment is an irregular plate that includes a top edge 620, an entry edge 630, and a connecting edge 640, wherein the top edge 620 is located at the top of the blocking mechanism 600 and is generally horizontally disposed, the entry edge 630 is located on the side of the blocking mechanism 600 away from the securing tab 612 and is generally vertically disposed, and the connecting edge 640 transitions between the securing tab 612 and the entry edge 630.

It will be appreciated that the connecting edge 640 of the blocking mechanism 600 may be an arcuate edge, a straight edge, or a contoured edge, as long as it completely covers the edge of the cutting element 220 inside the blocking mechanism 600.

Further, in this embodiment, the axial gap between the inner surface of the blocking mechanism 600 and the cutting element 220 is g1 ', 1/20 ≦ g1 '/r ≦ 1/8, such as 1/11 ≦ g1"/r ≦ 1/10, where the axial gap g1 ' in this embodiment generally satisfies 0 < g1 ≦ 8 mm.

Through setting up separation mechanism 600, make its rotation center that covers cutting member 220 and cross the horizontal central line and the vertical central line of cutting member, restricted that the rotatory coolant liquid that drives of cutting member produces and to get rid of on a large scale spatters, improves the utilization ratio of coolant liquid, avoids the user to frequently add the coolant liquid, also avoids getting rid of because of the coolant liquid and spattering the environmental pollution who leads to.

As shown in fig. 16, the blocking mechanism 600 further includes a flow restriction surface 650 and a flow blocking element 660 provided on an inner surface of the blocking mechanism 600, wherein the inner surface refers to a surface facing the cutting element 220, a boss protruding toward the cutting element 220 is formed on the blocking mechanism 600, the flow restriction surface 650 is formed on the boss, and an axial gap g2 between the flow restriction surface 650 and the cutting element 220 substantially satisfies 0 < g2 ≦ 8mm, for example, 6mm, and the axial gap g2 is smaller than an axial gap g1 "between the inner surface of the blocking mechanism 600 and the cutting element 220.

Wherein the axial gap g3 between the flow-blocking element 660 and the surface of the cutting element 220 may be less than or equal to the axial gap g2 between the flow-restricting surface 650 and the cutting element 220. In this embodiment, the axial gap g3 between the choke element 660 and the surface of the cutting element 220 is smaller than the axial gap g2 between the flow-restricting surface 650 and the cutting element 220.

As shown in fig. 16, the spoilers 660 are disposed at one or more angles to the direction of rotation of the cutter 220. From this can carry out the suppression of multi-angle to the coolant liquid that cutting member 220 brought out, the coolant liquid that prevents of multi-angle is got rid of and is spattered. Wherein the direction of rotation of the cutting member refers to a direction substantially tangential to the outer edge of the cutting member.

The splashing phenomenon of the cooling liquid in the cutting process can be further limited by limiting the axial clearance between the inner surface of the blocking mechanism 600 and the cutting piece and arranging the flow limiting surface 650 and the flow blocking piece 660, so that the use efficiency of the cooling liquid is further improved.

Of course, further, a plurality of drainage units, such as drainage ribs or drainage ports, are further disposed on the inner wall of the blocking mechanism 600 for timely draining the coolant splashed on the inner wall of the blocking mechanism 600 during the cutting process into the fluid chamber. Wherein the drainage openings may be openings formed between adjacent spoilers.

The axial gap g4 between the top edge 620 of the blocking mechanism 600 and the cutting element 220 in this embodiment constitutes the minimum axial gap between the blocking mechanism 600 and the cutting element 220, which approximately satisfies 0 < g4 ≦ 4mm, for example g4 of 3 mm.

Similarly, the blocking mechanism 600 may further include a blocking unit 360 disposed at the position of the cutting member 220 rotated out of the blocking mechanism 600, wherein the blocking unit 360 is at least one soft blocking pad disposed at the outlet end of the cutting member 220 of the top edge 620, and the gap between the blocking unit 360 and the cutting member 220 is smaller than or equal to the gap between the top edge 620 and the cutting member 220. Specifically, the flow blocking unit 360 may be a rubber pad, which may be fixed on the sidewall of the fluid chamber 111 or on the blocking mechanism 600. Wherein the soft stop pad of this embodiment is transversely disposed at the outlet end of the blocking mechanism 600.

The top edge 620 of the blocking mechanism 600 and the flow blocking unit 360 are the last obstacle to the cooling liquid, which is used to finally suppress the amount of cooling liquid that swirls out with the cutting member 220, thereby avoiding the formation of a large amount of splash and accumulation of liquid at the outlet of the cutting member 220 on the operation table 120, and also avoiding the generation of a large amount of sewage to shield the cutting line from affecting the cutting accuracy.

It should be noted that the blocking mechanism 600 according to the above embodiment of the present invention may be used alone, i.e., may be installed separately in the fluid chamber 111 at the axial outer side of the cutting member 220. The cutting tool can also be matched with the fluid control mechanism or the drainage cover in other embodiments for use, so that the splashing prevention effect of the cutting tool and the use efficiency of the cooling liquid are further improved.

As shown in fig. 17, the cutting tool 100 according to an embodiment of the present invention is provided with both the drainage cover 500 and the blocking mechanism 600, wherein the fixing manner of the drainage cover, the blocking mechanism 600 and the blocking mechanism 600, and the covering position of the blocking mechanism 600 and the cutting element 220 are the same as those in the above-mentioned embodiments, and are not repeated herein.

Specifically, the blocking mechanism 600 is disposed axially outward of the draft shield 500 for further limiting axial splash generated during rotation of the cutting element 220.

Of course, as an alternative embodiment, it is also possible to dispense with the shaft housing 520, in which case the outer surface of the support side wall 111b 'on the inside of the cutting element 220 is designed as a flow-directing plane in the cutting element 220, or to provide several plane elevations on the support side wall 111 b', one side of which is designed as a flow-directing plane close to the cutting element 220. Meanwhile, the inner surface of the blocking mechanism 600 positioned outside the shaft end of the cutting element 220 can form a drainage plane 321 positioned outside the cutting element 220 in the axial direction, and the axial gap between the formed drainage plane 321 and the surface of the cutting element 220 is g, so that 1/20 g/r is not less than 1/8, for example 1/11 g/r is not less than 1/10; also satisfies the condition that g is more than 0 and less than or equal to 8 mm.

As shown in fig. 18, a cutting tool 100 according to an embodiment of the present invention is provided, wherein the cutting tool 100 in this embodiment is provided with both the fluid control mechanism and the blocking mechanism 600, wherein the fixing manner of the fluid control mechanism, the blocking mechanism 600, and the covering position of the blocking mechanism 600 and the cutting element 220 are the same as those in the above-mentioned embodiments, and are not repeated herein.

Specifically, the blocking mechanism 600 is disposed outside of the arcuate boss forming the fluid control mechanism for further limiting the axial flinging generated during rotation of the cutter 220.

Further, at this time, the inner side surface of the blocking mechanism 600 may form a drainage plane 321 located axially outside the cutting element 220, and an axial gap between the formed drainage plane 321 and the surface of the cutting element 220 is g, so that 1/20 g/r 1/8 is greater than or equal to g/r, for example 1/11 g/r 1/10; also satisfies the condition that g is more than 0 and less than or equal to 8 mm.

The foregoing shows and describes the general principles, principal features and advantages of the invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (10)

1. A cutting tool, comprising:

a base including a fluid cavity containing a fluid;

the operating platform is arranged on the base;

a cutting mechanism including a drive member and a cutting member, the drive member driving the cutting member to rotate about a first axis, the cutting member at least partially protruding through the console;

the cutting member has an entering area and a leaving area on a rotating path of the cutting member, wherein the entering area refers to the rotating path of the cutting member entering fluid and rotating to a lower limit position, and the leaving area refers to the rotating path of the cutting member rotating to leave fluid from the lower limit position;

it is characterized in that the preparation method is characterized in that,

the blocking mechanism is arranged at the axial end part of the cutting piece in the fluid cavity along the direction which is approximately perpendicular to the first axis;

the blocking mechanism covers at least the cutting member at the disengagement zone, the axial projection extending across a vertical centerline of the cutting member and towards the entry zone, the axial projection extending upwardly across a horizontal centerline of the cutting member.

2. The cutting tool of claim 1, wherein the axial projection covers the cutting element in a horizontal direction for a length L, the axial projection covers the cutting element in a vertical direction for a height H, and the cutting element has a diameter D, such that L/D is greater than or equal to 2/3 and H/D is greater than or equal to 2/3.

3. The cutting tool of claim 2, wherein the blocking mechanism is located at the entry region a horizontal distance Δ L, where Δ L/D is greater than or equal to 1/6; and the vertical distance between the top of the blocking mechanism and the rotation center is delta H, and the delta H/D is not less than 1/6.

4. A cutting tool according to claim 2 or 3, wherein the axial clearance between the inner surface of the blocking means and the cutting element is g1", the radius of the cutting element being r, then 1/20 ≦ g1"/r ≦ 1/8.

5. The cutting tool of claim 3, further comprising a flow restricting surface disposed on an inner surface of the blocking mechanism, wherein an axial clearance between the flow restricting surface and the cutting element is less than an axial clearance between the inner surface of the blocking mechanism and the cutting element.

6. A cutting tool according to claim 4, wherein the axial clearance between the flow restriction surface and the cutting element is g2, 0 < g2 ≦ 8 mm.

7. The cutting tool of claim 5, further comprising a resistive element disposed on an inner surface of the blocking mechanism, the resistive element being disposed at one or more angles relative to a direction of rotation of the cutting element.

8. The cutting tool of claim 1, wherein the blocking mechanism is pivotally connected or keyed to the fluid chamber.

9. The cutting tool of claim 1, further comprising a radial drainage element disposed in the fluid chamber and including at least a curved drainage surface disposed about the periphery of the cutting element, the curved drainage surface being substantially on a circle centered on the axis of the cutting element; the blocking mechanism is arranged on the axial outer side of the radial drainage unit.

10. The cutting tool of claim 1, further comprising a drainage housing, disposed in the fluid chamber in connection with the fluid chamber, comprising a circumferential housing main shell disposed around the periphery of the cutting member, the circumferential housing main shell comprising a drainage curve substantially on a circumference centered on the axis of the cutting member; the blocking mechanism is arranged on the axial outer side of the radial drainage unit.

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