Vibrating type hard rock cutting mechanism with function of directional high-speed abrasive jet advanced slitting

Abstract

A vibrating type hard rock cutting mechanism with a function of directional high-speed abrasive jet advanced slitting includes a disc-shaped hob, a cutting main shaft and a valve plate. When the vibrating type hard rock cutting mechanism works, an outlet of a high-pressure abrasive jet generating system is communicated to a cutting mechanism abrasive jet inlet. An abrasive jet enters an abrasive jet nozzle through flow channels in the valve plate, the cutting main shaft and the disc-shaped hob and forms a directional high-speed abrasive jet. The cutting main shaft is directly driven to rotate by an axial permanent magnet motor. The cutting mechanism enables the disc-shaped hob to vibrate under the action of a vibration motor. A macro crack is formed on a rock mass by rotating the abrasive jet. The rotating disc-shaped hob can be wedged into the formed crack in a vibration manner by swinging the cutting mechanism.

Claims

1. A vibrating type hard rock cutting mechanism with a function of directional high-speed abrasive jet advanced slitting, comprising a disc-shaped hob, a cutting main shaft and a valve plate, wherein an outer side of the valve plate is provided with an abrasive jet inlet, an inner side of the valve plate is provided with an arc-shaped groove flow channel, and the abrasive jet inlet and the arc-shaped groove flow channel are communicated by a first flow channel; the inner side of the valve plate and both sides of the arc-shaped groove flow channel are provided with a rotating dynamic seal ring groove, an O-ring is mounted in the rotating dynamic seal ring groove, and a sealing connection between the valve plate and the cutting main shaft is achieved by the O-ring; a group of second flow channels are evenly arranged in the cutting main shaft, and one or more of the second flow channels are always maintained to be communicated to the arc-shaped groove flow channel during rotation of the cutting main shaft; and the disc-shaped hob comprises a cutter body and a group of alloy cutter heads, a group of third flow channels are arranged in the cutter body, the third flow channels or branches of the third flow channels extend to an edge position of the cutter body, cuts are processed at a corresponding position to inlay abrasive jet nozzles, the alloy cutter heads are circumferentially mounted between the adjacent abrasive jet nozzles, and the cutter body is fixed to a front end of the cutting main shaft through a first fastening bolt to ensure connection between the third flow channels and the second flow channels, wherein a first static seal ring groove is provided at a joint position between the cutter body and the cutting main shaft, and a rubber O-ring is mounted in the first static seal ring groove.

2. The vibrating type hard rock cutting mechanism with a function of directional high-speed abrasive jet advanced slitting according to claim 1, wherein the arc-shaped groove flow channel has an arc angle of 60180.

3. The vibrating type hard rock cutting mechanism with a function of directional high-speed abrasive jet advanced slitting according to claim 1, wherein the O-ring mounted in the rotating dynamic seal ring groove is a polytetrafluoroethylene O-ring.

4. The vibrating type hard rock cutting mechanism with a function of directional high-speed abrasive jet advanced slitting according to claim 1, wherein a number of the second flow channels is 24.

5. The vibrating type hard rock cutting mechanism with a function of directional high-speed abrasive jet advanced slitting according to claim 1, further comprising a bearing end cover, a main shaft housing, an axial permanent magnet motor and a vibration motor, wherein the cutting main shaft is rotationally connected with respect to the main shaft housing through a first radial bearing, a thrust bearing and a second radial bearing, the valve plate and the bearing end cover are fixed to front and rear ends of the main shaft housing through a second fastening bolt and a third fastening bolt, respectively, the first radial bearing, the thrust bearing and the second radial bearing are sealed within a sealed space formed by the cutting main shaft and the main shaft housing through the valve plate and the bearing end cover, the cutting main shaft is radially fixed in conjunction with a stepped structure of the cutting main shaft, a stepped structure of the main shaft housing and a backing ring, the axial permanent magnet motor and the vibration motor are fixed to the main shaft housing through a fourth fastening bolt and a fifth fastening bolt, respectively, and an output shaft of the axial permanent magnet motor and a rear end of the cutting main shaft are connected by a spline.

6. The vibrating type hard rock cutting mechanism with a function of directional high-speed abrasive jet advanced slitting according to claim 5, further comprising a support housing, the main shaft housing being fixed to the support housing through a sixth fastening bolt.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic structure view of the present invention.

(2) FIG. 2 is a cross-sectional schematic structure view of a cutting main shaft.

(3) FIG. 3 is a cross-sectional schematic structure view of a valve plate.

(4) FIG. 4 is a schematic structure view of a section A-A in FIG. 3.

(5) FIG. 5 is a cross-sectional schematic structure view of a disc-shaped hob.

(6) FIG. 6 is a schematic structure view of a section B-B in FIG. 5.

(7) In which, 1, disc-shaped hob; 2, first fastening bolt; 3, cutting main shaft; 4, second fastening bolt; 5, valve plate; 6, main shaft housing; 7, first radial bearing; 8, backing ring; 9, thrust bearing; 10, second radial bearing; 11, bearing end cover; 12, third fastening bolt; 13, radial permanent magnet motor; 14, fourth fastening bolt; 15, vibration motor; 16, support housing; 17, fifth fastening bolt; 18, sixth fastening bolt; 19, lubricating oil; 20, high-speed abrasive jet; 1-1, cutter body; 1-2, abrasive jet nozzle; 1-3, cut; 1-4, alloy cutter head; 1-5, cylindrical boss; 1-6, static seal ring groove I; 1-7, sinking through hole; 1-8, third flow channel; 3-1, second flow channel; 3-2, cylindrical groove; 3-3, internal threaded hole; 3-4, external spline; 5-1, abrasive jet inlet; 5-2, first flow channel; 5-3, rotating dynamic seal ring groove; 5-4, second static seal ring groove; 5-5, inner hole; 5-6, arc-shaped groove flow channel; 5-7, stepped through hole; and 13-1, internal spline shaft.

DESCRIPTION OF THE EMBODIMENTS

(8) The present invention will be further described below with reference to the accompanying drawings.

(9) As shown in FIG. 1, a vibrating type hard rock cutting mechanism with a function of directional high-speed abrasive jet advanced slitting includes a disc-shaped hob 1, a cutting main shaft 3, a valve plate 5, a bearing end cover 11, a main shaft housing 6, a support housing 16, an axial permanent magnet motor 13, and a vibration motor 15. The main shaft housing 6 serves as a link for other components of the cutting mechanism. The axial permanent magnet motor 13, a housing and the vibration motor 15 are fixed to the main shaft housing 6 through a fourth fastening bolt 14 and a fifth fastening bolt 17, respectively. When the axial permanent magnet motor 13 works, an internal spline shaft 13-1 outputs a certain rotation speed and torque. When the vibration motor 15 works, an excitation force is output onto the main shaft housing 6.

(10) An internal spline shaft 13-1 of the axial permanent magnet motor 13 cooperates with an external spline 3-4 at a rear end of the cutting main shaft 3. The disc-shaped hob 1 is fixed to a front end of the cutting main shaft 3 through a first fastening bolt 2. When the axial permanent magnet motor 13 works, an output rotation motion and torque are sequentially transferred to the cutting main shaft 3 and the disc-shaped hob 1. An external high-pressure abrasive jet system forms a high-speed abrasive jet 20 through an abrasive jet inlet 5-1, a first flow channel 5-2 and an arc-shaped groove flow channel 5-6 of the valve plate 5, a second flow channel 3-1 of the cutting main shaft 3, a third flow channel 1-8 of the disc-shaped hob 1, and an abrasive jet nozzle 1-2. When the axial permanent magnet motor 13, the vibration motor 15 and the external high-pressure abrasive jet system simultaneously work, the high-speed abrasive jet 20 can be combined with the disc-shaped hob 1 to break a rock.

(11) In FIG. 2 to FIG. 4, the cutting main shaft 3 and the valve plate 5 are shown. The cutting main shaft 3 is processed with independent right-angled second flow channels 3-1. The valve plate 5 is processed with an abrasive jet inlet 5-1, a first flow channel 5-2, a plurality of rotating dynamic seal ring grooves 5-3, and a second static seal ring groove 5-4. An inner hole 5-5 of the valve plate 5 is processed with an arc-shaped groove flow channel 5-6, and the first flow channel 5-2 is communicated to the arc-shaped groove flow channel 5-6. Preferably, the arc-shaped groove flow channel 5-6 has an arc angle of 60180. During operation, the right-angled second flow channels 3-1 of the cutting main shaft 3 are in clearance connection with the arc-shaped groove flow channel 5-6. An abrasive jet therebetween is mounted in the plurality of rotating dynamic seal ring grooves 5-3 and sealed by a polytetrafluoroethylene O-ring. The cutting main shaft 3 introduces an abrasive jet once to the independent right-angled second flow channels 3-1 every revolution, respectively.

(12) In FIG. 5 and FIG. 6, the disc-shaped hob 1 is shown. A cutter body 1-1 of the disc-shaped hob 1 is evenly inlaid with a plurality of abrasive jet nozzles 1-2 radially. Cuts 1-3 are processed at positions where the abrasive jet nozzles 1-2 are inlaid, respectively. The cutter body 1-1 is discretely inlaid with a plurality of alloy cutter heads 1-4 radially. The cutter body 1-1 is provided with a cylindrical boss 1-5 cooperating with a cylindrical groove 3-2 of the cutting main shaft 3. A static seal ring groove 1-6 is processed in an end surface of the cylindrical boss 1-5. The cutter body 1-1 is provided with a sinking through hole 1-7 for the first fastening bolt 2 axially. A third flow channel 1-8 correspondingly communicated to the second flow channel 3-1 of the cutting main shaft 3 is processed inside the cutter body 1-1. They are sealed by a rubber O-ring mounted in the first static seal ring groove 1-6. An abrasive jet introduced to the third flow channel 1-8 periodically from the second flow channel 3-1 of the cutting main shaft 3 forms a directional high-speed abrasive jet 20 through the abrasive jet nozzles 1-2.

(13) As shown in FIG. 1 to FIG. 6, when the cutting mechanism works, the external high-pressure abrasive jet system forms a directional high-speed abrasive jet 20 under the combined action of the valve plate 5, the cutting main shaft 3 and the disc-shaped hob 1, and cuts a circular arc-shaped crack surface on a rock cutting path of the disc-shaped hob 1. At the same time, under the combined drive of the axial permanent magnet motor 13 and the vibration motor 15, the inlaid allow cutter heads 1-4 of the disc-shaped hob 1 are cut into the crack surface formed by cutting the high-speed abrasive jet 20 in a rotational vibration manner, thus extruding the crack surface to break a rock mass.

(14) The principle of the vibrating type hard rock cutting mechanism with a function of directional high-speed abrasive jet advanced slitting of the present invention is as follows: when the cutting mechanism works, a working face power system supplies power to the axial permanent magnet motor 13 and the vibration motor 15, the powered axial permanent magnet motor 13 forms a rotation motion and torque that is output then by the internal spline shaft 13-1, the internal spline shaft 13-1 cooperates with the external spline 3-4 at the rear end of the cutting main shaft 3 to transfer the rotation motion and torque to the cutting main shaft 3, and the front end of the cutting main shaft 3 fixes, through the first fastening bolt 2, the disc-shaped hob 1 to make it have a certain rotation speed and torque, so that the disc-shaped hob 1 can break the rock by rotational cutting. Since the vibration motor 15 is fixed to the main shaft housing 6 through the fifth fastening bolt, the powered vibration motor 15 outputs an excitation force that is then sequentially transferred to the main shaft housing 6, the first radial bearing 7, the second radial bearing 10, the thrust bearing 9 and the cutting main shaft 3 to the disc-shaped hob 1, so that the disc-shaped hob 1 can cut the rock in a rotational vibration manner. After the external high-pressure abrasive jet system works, a high-pressure abrasive jet is formed into the high-speed abrasive jet 20 through the abrasive jet inlet 5-1, the first flow channel 5-2 and the arc-shaped groove flow channel 5-6 of the valve plate 5, the second flow channel 3-1 of the cutting main shaft 3, the third flow channel 1-8 of the disc-shaped hob 1, and the abrasive jet nozzle 1-2. Since the arc-shaped groove flow channel 5-6 preferably has an arc angle of 60180, the right-angled second flow channel 3-1 of the cutting main shaft 3 that rotates during operation is in clearance connection with the arc-shaped groove flow channel 5-6. Only the arc-shaped groove flow channel 5-6, the right-angled second flow channel 3-1 of the cutting main shaft 3, the third flow channel 1-8 of the disc-shaped hob 1 and the abrasive jet nozzle 1-2 are continuously communicated to form the directional high-speed abrasive jet 20. By design, the directional high-speed abrasive jet 20 formed at any time is located on a contact path between the disc-shaped hob 1 and the rock mass. When the axial permanent magnet motor 13, the vibration motor 15 and the external high-pressure abrasive jet system simultaneously work, the formed directional high-speed abrasive jet 20 cuts an arc-shaped crack on the contact path between the disc-shaped hob 1 and the rock mass in advance. Then, the disc-shaped hob 1 is wedged into the arc-shaped crack in a rotational vibration manner. By fully utilizing the characteristic that a hard rock mass is easily fractured, the rock breaking capacity and efficiency of the disc-shaped hob 1 are greatly improved.

(15) The above is only a preferred implementation manner of the present invention, and it should be noted that those of ordinary skill in the art can also make several improvements and modifications without departing from the principles of the present invention, which should be regarded as the scope of protection of the present invention.

(16) It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents.