CN111271059A - Detachable cutting tool assembly with dust fall function - Google Patents

Abstract

The invention provides a detachable cutting tool assembly with a dust fall function, belonging to the technical field of cutting device accessories of coal mining machinery, and comprising a conical cutting pick, a conical tooth holder, a dust fall connecting seat and a fixing block; the conical cutting pick comprises a tooth handle, a tooth shoulder, a tooth bar and a conical part; the tooth handle and the tooth bar are both cylindrical structures; the tooth shoulder is in a round platform structure, the bottom surface of the tooth shoulder is connected with the tooth handle, and the top surface of the tooth shoulder is connected with the tooth bar through an annular transition curved surface; the conical part is positioned on the toothed bar, hard alloy is brazed at the top of the conical part, and a plurality of oval anti-bending beams are uniformly arranged on the circumferential surface of the conical part; the bevel gear seat is provided with a mounting hole, and the lower part of the bevel gear seat is provided with a quick tenon; the dust fall connecting seat is provided with an insertion groove, the bottom surface of the dust fall connecting seat is provided with a water distribution interface, the rear part of the dust fall connecting seat is provided with a dust fall nozzle, and a built-in water path is arranged inside the dust fall nozzle; the fixed block is used for closing the insertion opening of the insertion groove. Above-mentioned detachable cutting tool assembly with dust fall function can multiplicable pick bending resistance, realizes simultaneously that toothholder and cutterhead or cutting drum can dismantle and be connected.

Description

Detachable cutting tool assembly with dust fall function

Technical Field

The invention belongs to the technical field of accessories of cutting devices of coal mining machinery, and particularly discloses a detachable cutting tool assembly with a dust falling function.

Background

The cutting pick is arranged in a mounting hole of the cutting head tooth holder and can freely rotate around the axis in the mounting hole. In the working process of the heading machine, the cutting teeth directly contact with the coal body and the rock body, the time is accumulated at any time, the circumferential surface of the conical part of the cutting tooth holder rod is uniformly abraded, and the cutting tooth needs to be replaced by a new cutting tooth until the length of the holder rod is shortened to be unusable due to abrasion. Some existing cutting picks adopt a mode of reducing the angle of a conical part and coating a wear-resistant material to prolong the service life of the cutting pick, but the method actually manufactures the cutting pick into a combined structure of two materials, greatly weakens the bending resistance of a cutting pick rod, and influences the actual service life of the cutting pick. Due to the complex geological conditions of a coal mine, under the conditions that the hardness of coal and rock is high and certain abrasiveness is achieved, when the contact force between a cutting pick holder and a tooth holder mounting hole is increased and exceeds the critical friction between the cutting pick holder and the tooth holder mounting hole, the rotational freedom degree of a cutting pick in the mounting hole is limited, the cutting pick cannot rotate in the mutual contact process of the cutting pick and a coal body and a rock body, a certain area of a cutting pick rod in the circumferential direction is always in contact with the coal body or the rock body, and metal materials in the area are rapidly abraded to cause eccentric wear of the cutting pick. The strength of the cutting pick where pick-biased wear occurs will be further weakened, resulting in bending failure of the cutting pick as a whole. In addition, in order to reduce the resistance of the cutting tooth to cut into the coal body or the rock body, the front end taper of the cutting tooth holder is usually smaller, so that the cutting tooth is convenient to cut into the coal body or the rock body, but the wrapping performance of the less tapered holder on the hard alloy arranged at the top of the cutting tooth is poor, and after the metal material in the circumferential direction of the cutting tooth holder is abraded by a certain amount, the hard alloy is easy to fall off, so that the cutting tooth cannot effectively break rock. Therefore, on the premise of ensuring that the installation and use geometric dimension of the cutting pick are unchanged, the self-abrasion performance of the cutting pick is improved, the bending resistance of the cutting pick is increased, and the service life of the cutting pick can be effectively prolonged by having certain abrasion resistance.

The block is typically welded to the outer surface of the cutting head or cutting drum body and the cutting pick is inserted into a mounting hole in the block. In the course of rock excavation after coal mining, there is often a significant wear phenomenon associated with the cutting pick and the holder. When the abrasion occurs on the cutting pick, the cutting pick can be taken out of the mounting hole of the cutting block and replaced by a new cutting pick. However, when the toothholder is worn, the toothholder cannot be replaced because the toothholder is welded with the cutting head or the cutting drum body, and the cutting head or the cutting drum has to be lifted for maintenance. In order to avoid the damage of the toothholder, the cutting head or the cutting drum can not be normally used, the toothholder can be reliably connected to the surface of the cutting head or the cutting drum, and can be detachably and mechanically connected with the toothholder, so that the toothholder can be dismounted, mounted and replaced without welding in the underground coal mine. In addition, due to the fact that the cutting teeth are in periodic contact with and separated from the coal rocks, the impact phenomenon is obvious, and a large amount of dust is generated, the dust is diffused in a closed roadway, the dust concentration in the roadway is increased, the visibility is reduced, the continuity of work and the health of workers are affected, and therefore dust falling treatment is very necessary.

Disclosure of Invention

The invention aims to provide a detachable cutting tool assembly with a dust fall function, which increases the bending resistance of a cutting pick, realizes the detachable connection of a tooth holder and a cutting head or a cutting drum, and has the dust fall function.

In order to achieve the purpose, the invention provides a detachable cutting tool assembly with a dust fall function, which comprises a conical cutting pick, a conical tooth holder, a dust fall connecting seat and a fixing block, wherein the conical cutting pick is fixed on the conical tooth holder; the conical cutting pick comprises a tooth handle, a tooth shoulder, a tooth bar and a conical part which are integrally formed; the tooth handle and the tooth bar are both cylindrical structures; the tooth shoulder is in a round platform structure, the bottom surface of the tooth shoulder is connected with the tooth handle, and the top surface of the tooth shoulder is connected with the tooth bar through an annular transition curved surface; the conical part is positioned on the toothed bar, hard alloy is brazed at the top of the conical part, and a plurality of oval anti-bending beams are uniformly arranged on the circumferential surface of the conical part; the oval bending-resistant beam is arranged in a mode of small top and big bottom, the oval outline curve of the oval bending-resistant beam is controlled by a parameter equation (1),

wherein c is a number greater than 2;

the bevel gear tooth seat is provided with a mounting hole matched with the gear handle, and the lower part of the bevel gear tooth seat is provided with a quick tenon; the dust fall connecting seat is used for being welded on the cutting head or the cutting drum and is provided with an inserting groove matched with the quick inserting tenon, the bottom surface of the dust fall connecting seat is provided with a water distribution interface communicated with a water distribution hole of the cutting head or the cutting drum, the rear part of the dust fall connecting seat is provided with a dust fall nozzle, and a built-in water channel communicated with the water distribution interface and the dust fall nozzle is arranged in the dust fall connecting seat; the fixed block is used for being fixed on the dust fall connecting seat after fast tenon and the assembly of cartridge groove, seals the inserted hole of cartridge groove.

Further, the contact area between the front face of the bevel tooth seat and the chips is a separating face with an obtuse included angle.

Furthermore, a wear-resistant material distributing block forming an acute angle with the horizontal direction is embedded on the separating surface; the wear-resistant distributing block is made of hard alloy.

Furthermore, the mounting hole of the bevel gear tooth seat comprises a first step hole, a second step hole and a third step hole, wherein the diameters of the first step hole, the second step hole and the third step hole are sequentially reduced from front to back; the first step hole and the second step hole are internally provided with a lining ring in interference fit, and the hardness of the lining ring is greater than that of the conical cutting pick; the tooth handle of the conical cutting pick is inserted into the lining ring, and the tooth shoulder is abutted against the lining ring.

Furthermore, the detachable cutting tool assembly with the dust falling function also comprises a baffle ring for a shaft; the part of the tooth handle extending out of the mounting hole is provided with an annular clamping groove matched with the baffle ring for the shaft.

Furthermore, the bottom surface of the tooth shoulder is provided with an annular concave shoulder; the lining ring is provided with a convex shoulder matched with the concave shoulder.

Furthermore, the convex shoulder is of a double-conical-surface annular structure, and the included angle between the conical surfaces on the inner side and the outer side and the horizontal plane is 120 degrees.

Furthermore, the fast tenon is a T-shaped tenon, the distance between the side positioning surfaces at two sides is gradually reduced from front to back, and the side positioning surfaces are in transitional connection with the back end surface through guide inclined surfaces; the inserting groove is matched with the fast inserting tenon.

Further, a fixed block mounting position is arranged on the dust fall connecting seat; the fixing block mounting position extends forwards from the insertion hole of the insertion groove and is provided with a fixing groove; the bottom surface of the fixed block is provided with a stop key matched with the fixed groove; the fixing groove and the stop key are both provided with screw holes, and the fixing screws penetrate through the screw holes to fix the fixing block on the fixing block mounting position.

Further, the side surface of the dust fall connecting seat corresponding to the fixing block mounting position is an anti-friction surface; the two sides of the fixed block are antifriction surfaces; the distance between the wear reducing surfaces on the two sides is gradually increased from front to back.

The invention has the beneficial effects that:

in the above-mentioned detachable cutting tool assembly with dust fall function, the integrated into one piece of toper pick adoption same material, no joint seam has avoided the low frequency to assault the separation phenomenon of different materials under the load effect by a wide margin, improves the reliability that the pick used. The oval bending-resistant beams are uniformly distributed on the outer surface of the conical part, can effectively resist bending loads from different directions, and accordingly increase the bending resistance of the conical cutting pick, the working capacity of the cutting head or the cutting drum is improved, the convex structure can effectively resist abrasion of coal rocks to the conical part, and the service life of the conical cutting pick is prolonged. The tooth handle of the conical cutting tooth is rotatably arranged in the mounting hole of the conical tooth holder and rotates in the working process, and the coal body or rock is efficiently cut in. The fast tenon of awl tooth toothholder cooperates with the cartridge groove of dust fall connecting seat, realizes quick assembly disassembly. The fixed block is used for fixing on the dust fall connecting seat after fast tenon and the assembly of cartridge groove, seals the inserted hole in cartridge groove, guarantees the reliable connection of awl tooth toothholder and dust fall connecting seat, prevents that the cutting in-process awl tooth toothholder from droing. Built-in waterway system of dust fall connecting seat can not pass through the awl tooth toothholder with the water in cutterhead or cutting drum water storage chamber, and the dust fall nozzle blowout at direct follow dust fall connecting seat rear portion reaches the dust suppression purpose to can cool off arranging at the hou mian adjacent toper pick of this toper pick simultaneously, reduced the influence to spraying system when the awl toothholder is dismantled and is changed simultaneously.

Drawings

FIG. 1 is an assembly view of a detachable cutting tool assembly with a dust fall function provided by the present invention;

FIG. 2 is an exploded view of the detachable cutting tool assembly with dust fall function shown in FIG. 1;

FIG. 3 is another side view of the exploded view of FIG. 2;

FIG. 4 is a schematic view of a conical pick of the removable cutting tool of FIG. 1;

FIG. 5 is a schematic view of a bevel-tooth holder of the removable cutting tool of FIG. 1;

FIG. 6 is an assembly view of the conical pick and the conical pick block;

FIG. 7 is an assembly view of the dust settling connecting seat and the fixing block;

fig. 8 is an assembly view of the bevel gear seat and the dust fall connecting seat;

FIG. 9 is a cross-sectional view taken in the direction of assembly A-A of FIG. 8;

fig. 10 is a cross-sectional view in the direction of assembly B-B shown in fig. 8.

In the figure: 1-a conical cutting pick; 1.1-tooth shank; 1.2-tooth shoulder; 1.3-toothed bar; 1.4-tapered section; 1.5-annular transition curved surface; 1.6-hard metal; 1.7-oval beam bending resistance; 1.8-a rotation increasing groove; 1.9-ring slot; 1.10-concave shoulder; 2-a bevel gear tooth holder; 2.1-mounting holes; 2.2-inserting tenon quickly; 2.3-separating surface; 2.4-wear resistant distributor block; 2.5-side locating surface; 2.6-guiding inclined plane; 3-dust fall connecting seat; 3.1-inserting grooves; 3.2-water distribution interface; 3.3-dust settling nozzle; 3.4-built-in waterway; 3.5-fixed groove; 3.6-welding the slope; 4, fixing blocks; 4.1-stop key; 5-a liner ring; 5.1-shoulder; 6-baffle ring for shaft; 7-a set screw; 8-a wear reducing surface; 100-cutting head or cutting drum.

Detailed Description

The embodiment provides a detachable cutting tool assembly with a dust fall function, which comprises a conical cutting tooth 1, a conical tooth holder 2, a dust fall connecting seat 3 and a fixing block 4; the conical cutting pick 1 comprises a tooth handle 1.1, a tooth shoulder 1.2, a tooth bar 1.3 and a conical part 1.4 which are integrally formed; the tooth handle 1.1 and the tooth bar 1.3 are both cylindrical structures; the tooth shoulder 1.2 is in a circular truncated cone structure, the bottom surface of the tooth shoulder is connected with the tooth handle 1.1, and the top surface of the tooth shoulder is connected with the tooth bar 1.3 through an annular transition curved surface 1.5; the conical part 1.4 is positioned on the rack bar 1.3, the top of the conical part is brazed with hard alloy 1.6, and a plurality of oval anti-bending beams 1.7 are uniformly arranged on the circumferential surface; the oval bending-resistant beam 1.7 is arranged in a form of a small upper part and a big lower part, the oval profile curve of the oval bending-resistant beam 1.7 is controlled by a parameter equation (1),

wherein c is a number greater than 2;

the bevel gear tooth seat 2 is provided with a mounting hole 2.1 matched with the gear handle 1.1, and the lower part of the bevel gear tooth seat is provided with a fast tenon 2.2; the dust fall connecting seat 3 is used for being welded on the cutting head or the cutting drum 100 and is provided with an inserting groove 3.1 matched with the fast inserting tenon 2.2, the bottom surface is provided with a water distribution interface 3.2 communicated with a water distribution hole of the cutting head or the cutting drum 100, the rear part is provided with a dust fall nozzle 3.3, and the inside is provided with a built-in water channel 3.4 communicated with the water distribution interface 3.2 and the dust fall nozzle 3.3; and the fixing block 4 is used for being fixed on the dust-settling connecting seat 3 after the fast tenon 2.2 and the inserting groove 3.1 are assembled, and closing an inserting hole of the inserting groove 3.1.

In the above-mentioned detachable cutting tool assembly with dust fall function, toper pick 1 adopts the integrated into one piece of same material, and no joint seam has avoided the low frequency to assault the separation phenomenon of different materials under the load effect by a wide margin, improves the reliability that the pick used. The oval bending-resistant beams 1.7 are uniformly distributed on the outer surface of the conical part 1.4, can effectively resist bending loads from different directions, so that the bending-resistant capacity of the conical cutting pick 1 is increased, the working capacity of the cutting head or the cutting drum 100 is improved, the convex structure can effectively resist the abrasion of coal rocks to the conical part 1.4, and the service life of the conical cutting pick 1 is prolonged. The tooth handle 1.1 of the conical cutting tooth 1 is rotatably arranged in the mounting hole 2.1 of the conical tooth holder 2 and rotates in the working process, so that coal or rock is efficiently cut into. Fast tenon 2.2 of bevel gear toothholder 2 cooperates with dust fall connecting seat 3's cartridge groove 3.1, realizes quick assembly disassembly. Fixed block 4 is used for fixing on dust fall connecting seat 3 after fast tenon 2.2 and the assembly of cartridge groove 3.1, seals the inserted hole of cartridge groove 3.1, guarantees the reliable connection of awl tooth toothholder 2 and dust fall connecting seat 3, prevents that cutting in-process awl tooth toothholder 2 from droing. Built-in waterway system of dust fall connecting seat 3 can not pass through awl tooth toothholder 2 with the water in cutterhead or the 100 water storage chambeies of cutting drum, and the dust fall nozzle 3.3 blowout at direct 3 rear portions of dust fall connecting seat reaches the dirt purpose of suppressing to can cool off arranging at the following adjacent toper pick 1 of this toper pick 1 simultaneously.

Furthermore, a plurality of increasing grooves 1.8 are arranged on the tooth shoulder 1.2 and the annular transitional curved surface 1.5 of the conical cutting pick 1. When the conical cutting pick 1 is cut into the coal body and rotates along with the cutting head or the cutting drum 100 to be turned into a cutting pile, the groove wall of the rotation increasing groove 1.8 is in unilateral contact with the coal body or the cutting under the rotation action of the cutting head or the cutting drum 100, the torque generated in the contact promotes the conical cutting pick 1 to rotate around the axis of the cutting pick, after the previous rotation increasing groove 1.8 is turned out of a contact area, the next rotation increasing groove 1.8 is in continuous contact with the coal body or the cutting, the conical cutting pick 1 is enabled to continuously rotate around the axis of the cutting pick, and the self-rotation performance of the conical cutting pick 1 is improved. Because the conical cutting pick 1 is of an integral structure, the tooth bar 1.3 and the hard alloy 1.6 brazed at the top end of the conical part 1.4 also rotate along with the tooth bar, so that the conical cutting pick 1 is self-abraded in the cutting and chip loading processes, and the service life of the cutting pick is prolonged. The arrangement of the rotation increasing groove 1.8 on the tooth shoulder 1.2 and the annular transition curved surface 1.5 can effectively avoid the weakening of the concave structure of the rotation increasing groove 1.8 on the local material of the tooth bar 1.3, and the overall strength of the conical cutting pick 1 is not reduced.

Furthermore, the included angle between two side surfaces of the rotation increasing groove 1.8 is 90-100 degrees.

Furthermore, the contact area of the front surface of the conical tooth base 2 and the cutting chips is a separating surface 2.3 with an obtuse included angle, so that the impact abrasion of the cutting chips and other abrasive materials to the tooth base can be effectively reduced when the cutting head rotates. The obtuse angle is based primarily on the angle of the cutting pick measured after wear in actual operation, and is typically not less than 90 ° and between 120 ° and 160 °. The smaller the obtuse angle, the smaller the resistance, the more significant the wear-inhibiting effect, and the better the use effect, without lowering the overall strength of the bevel-tooth carrier 2. The angle is schematically shown as 150.

Furthermore, a wear-resistant distributing block 2.4 forming an acute angle with the horizontal direction is embedded on the separating surface 2.3, so that the cutting chips are smoothly discharged along the moving direction of the bevel-tooth holder 2; the wear-resistant distributor block 2.4 is made of hard alloy. According to the design standard that when the cutting head cuts the rock, the linear velocity of the tooth tip (1.6 part of the hard alloy) does not exceed the cutting of the coal rock, and the reasonable range of the angle is 20-30 degrees. This angle is shown to be about 22.

Further, the mounting hole 2.1 of the bevel gear tooth base 2 comprises a first step hole, a second step hole and a third step hole, wherein the diameters of the first step hole, the second step hole and the third step hole are sequentially reduced from front to back; the first step hole and the second step hole are internally provided with the lining ring 5 in an interference fit mode, so that the first step hole and the second step hole form an integral structure, the reliability of connection of the conical tooth holder 2 and the lining ring 5 is improved, and the hardness of the lining ring 5 is greater than that of the conical cutting tooth 1; the shank 1.1 of the conical pick 1 is inserted into the bushing 5 and the shoulder 1.2 rests against the bushing 5. The lining ring 5 is made of high-wear-resistance alloy steel through heat treatment, when the conical cutting pick 1 rotates in the lining ring 5 to generate friction wear, the hardness of the lining ring 5 is higher than that of the conical cutting pick 1, so that the wear mainly occurs on the end face of the tooth shoulder 1.2 contacted with the lining ring 5, and when the hard alloy 1.6 at the top of the conical cutting pick 1 or the end face contacted with the lining ring 5 fails due to wear, the conical cutting pick 1 of the vulnerable part can be replaced.

Furthermore, the detachable cutting tool assembly with the dust falling function also comprises a baffle ring 6 for a shaft; the part of the gear handle 1.1 extending out of the mounting hole 2.1 is provided with an annular clamping groove 1.9 matched with the baffle ring 6 for the shaft. The tooth handle 1.1 of the conical cutting tooth 1 is inserted into the mounting hole 2.1, and the shaft is clamped in the annular clamping groove 1.9 by the baffle ring 6 to fix the conical cutting tooth 1 in the conical tooth holder 2.

Further, the bottom surface of the tooth shoulder 1.2 is provided with an annular concave shoulder 1.10; the lining ring 5 is provided with a shoulder 5.1 which is matched with the concave shoulder 1.10. The tooth shoulder 1.2 and the lining ring 5 are buckled with each other through an annular conical surface, and the tooth shoulder 1.2 can freely rotate in the lining ring 5 and cannot be separated from the lining ring 5. Tooth shoulder 1.2 and backing ring 5 pass through annular conical surface and contact each other, from effective increase area of contact, reduce the contact specific pressure, reduce wearing and tearing, shoulder-concave shoulder lock structure can also play in addition and prevent that toper pick 1 from rocking because assembly gap or because toper pick 1 that the wearing and tearing of 1.1 cylindrical surface of toothholder lead to in mounting hole 2.1, can effectively stabilize toper pick 1 at the cutting in-process.

Furthermore, the convex shoulder 5.1 is of a double-conical-surface annular structure, the included angle between the conical surfaces on the inner side and the outer side and the horizontal plane is 120 degrees, normal phase loads acting on the conical cutting tooth 1 in the rock breaking process can be evenly distributed on the conical surfaces on the inner side and the outer side, so that the contact specific pressure of the convex shoulder 5.1 and the concave shoulder 1.10 is reduced, and the normal phase loads acting on the conical cutting tooth 1 in the rock breaking process are transferred to the conical tooth holder 2 through the lining ring 5 by the equilateral triangle formed in the force decomposition process.

Furthermore, the fast tenon 2.2 is a T-shaped tenon, the distance between the side positioning surfaces 2.5 at the two sides is gradually reduced from front to back, and the side positioning surfaces 2.5 are in transitional connection with the back end surface through guide inclined surfaces 2.6; the inserting groove 3.1 is matched with the fast tenon 2.2. The side positioning surface 2.5 and the guide inclined surface 2.6 of the fast tenon 2.2 can be fast inserted along the inserting groove 3.1, so that the automatic positioning of the inserting direction is realized. The included angle between the side positioning surfaces 2.5 at the two sides is a self-positioning angle.

Further, a fixing block mounting position is arranged on the dust fall connecting seat 3; the mounting position of the fixed block extends forwards from the insertion opening of the insertion groove 3.1 and is provided with a fixed groove 3.5; the bottom surface of the fixed block 4 is provided with a stop key 4.1 matched with the fixed groove 3.5; the fixing groove 3.5 and the stop key 4.1 are both provided with screw holes, and the fixing screw 7 penetrates through the screw holes to fix the fixing block 4 on a fixing block mounting position. The arrangement of the fixing groove 3.5 and the stop key 4.1 effectively prevents the fixing block 4 from being released from the fixing block mounting position.

Further, the side surface of the dust fall connecting seat 3 corresponding to the mounting position of the fixed block is an anti-friction surface 8; the two sides of the fixed block 4 are provided with antifriction surfaces 8; the distance between the two side abrasion reducing surfaces 8 is gradually increased from front to back, a right angle is formed in the movement direction of the dust fall connecting seat 3, and the rotating working resistance of the cutting head or the cutting drum 100 is reduced.

Further, the bottom surface and the side surface of the dust fall connecting seat 3 are in transition connection through inward-inclined welding slope surfaces 3.6, and the dust fall connecting seat 3 can be welded to the surface of the cutting head or the cutting drum 100 through welding the slope surfaces 3.6.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A detachable cutting tool assembly with a dust fall function is characterized by comprising a conical cutting pick, a conical tooth holder, a dust fall connecting seat and a fixing block;

the conical cutting pick comprises a tooth handle, a tooth shoulder, a tooth bar and a conical part which are integrally formed;

the tooth handle and the tooth bar are both cylindrical structures;

the tooth shoulder is of a circular truncated cone structure, the bottom surface of the tooth shoulder is connected with the tooth handle, and the top surface of the tooth shoulder is connected with the tooth rod through an annular transition curved surface;

the conical part is positioned on the toothed bar, hard alloy is brazed at the top of the conical part, and a plurality of oval anti-bending beams are uniformly arranged on the circumferential surface of the conical part;

the oval bending-resistant beam is arranged in a mode of small top and big bottom, the oval outline curve of the oval bending-resistant beam is controlled by a parameter equation (1),

wherein c is a number greater than 2;

the bevel gear tooth seat is provided with a mounting hole matched with the gear handle, and the lower part of the bevel gear tooth seat is provided with a quick tenon;

the dust fall connecting seat is used for being welded on the cutting head or the cutting drum and is provided with an inserting groove matched with the quick inserting tenon, the bottom surface of the dust fall connecting seat is provided with a water distribution interface communicated with a water distribution hole of the cutting head or the cutting drum, the rear part of the dust fall connecting seat is provided with a dust fall nozzle, and a built-in water channel communicated with the water distribution interface and the dust fall nozzle is arranged in the dust fall connecting seat;

the fixed block is used for being fixed on the dust-settling connecting seat after the fast inserting tenon and the inserting groove are assembled, and the inserting hole of the inserting groove is closed.

2. The detachable cutting tool assembly with dust fall function according to claim 1, wherein the contact area of the front face of the bevel tooth holder and the cutting chips is a separating surface with an obtuse included angle.

3. The detachable cutting tool assembly with the dust fall function according to claim 2, wherein a wear-resistant distributing block forming an acute angle with the horizontal direction is embedded on the separating surface;

the wear-resistant distributing block is made of hard alloy.

4. The detachable cutting tool assembly with the dust falling function according to claim 2 or 3, wherein the mounting hole of the bevel gear seat comprises a first step hole, a second step hole and a third step hole, the diameters of which are sequentially reduced from front to back;

the first step hole and the second step hole are internally provided with a lining ring in interference fit, and the hardness of the lining ring is greater than that of the conical cutting pick;

the tooth handle of the conical cutting pick is inserted into the lining ring, and the tooth shoulder is abutted against the lining ring.

5. The detachable cutting tool assembly with dust fall function of claim 4, further comprising a shaft baffle ring;

and the part of the tooth handle extending out of the mounting hole is provided with an annular clamping groove matched with the baffle ring for the shaft.

6. The detachable cutting tool assembly with the dust fall function according to claim 5, wherein the bottom surface of the tooth shoulder is provided with an annular concave shoulder;

and a convex shoulder matched with the concave shoulder is arranged on the lining ring.

7. The detachable cutting tool assembly with the dust fall function according to claim 6, wherein the shoulder has a double-conical ring structure, and the included angle between the conical surfaces at the inner side and the outer side and the horizontal plane is 120 degrees.

8. The detachable cutting tool assembly with the dust fall function according to claim 1, wherein the quick insertion tenon is a T-shaped tenon, the distance between the side positioning surfaces at two sides is gradually reduced from front to back, and the side positioning surfaces are in transitional connection with the back end surface through guide inclined surfaces;

the inserting groove is matched with the quick inserting tenon.

9. The detachable cutting tool assembly with the dust fall function according to claim 8, wherein a fixing block mounting position is arranged on the dust fall connecting seat;

the fixing block mounting position extends forwards from the insertion hole of the insertion groove and is provided with a fixing groove;

the bottom surface of the fixed block is provided with a stop key matched with the fixed groove;

the fixing groove and the stop key are both provided with screw holes, and the fixing screws penetrate through the screw holes to fix the fixing block on the fixing block mounting position.

10. The detachable cutting tool assembly with the dust fall function according to claim 9, wherein the side surface of the dust fall connecting seat corresponding to the fixing block mounting position is an anti-friction surface;

two sides of the fixed block are antifriction surfaces;

the distance between the wear reducing surfaces on the two sides is gradually increased from front to back.

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