AU2020277229B2

AU2020277229B2 - Eccentric hob type tunneling machine capable of breaking rock according to predetermined path without affecting supporting work

Info

Publication number: AU2020277229B2
Application number: AU2020277229A
Authority: AU
Inventors: Hongxiang JIANG; Songyong LIU; Zhencai Zhu
Original assignee: China University of Mining and Technology CUMT; China University of Mining and Technology Beijing CUMTB
Current assignee: China University of Mining and Technology Beijing CUMTB
Priority date: 2019-11-05
Filing date: 2020-04-14
Publication date: 2022-02-17
Anticipated expiration: 2040-04-14
Also published as: AU2020277229A1; CN110735647A; SE545716C2; CN110735647B; CA3101300C; CA3101300A1; JP7094584B2; JP2022500574A; WO2021088316A1; SE2130147A1

Abstract

Disclosed is an eccentric hob type tunneling machine capable of breaking rock according to a predetermined path without affecting supporting work, essentially consisting of a crawler walking mechanism, a rack, a hydraulic pump station, a power box, a sliding guide rail base, a propulsion cylinder I, a sliding seat, a transmission box, hydraulic motors, a hob arm rotating and sliding device, a hob arm, a low-speed high-torque motor, an eccentric disc-shaped hob, a control center, a loading device, a conveying device, a temporary supporting device, and an auxiliary work platform. The present invention is simple, compact and reliable in structure and convenient to assemble and disassemble, makes full use of low tensile strength characteristics of hard rock, and has strong rock breaking capability and high efficiency. The route of breaking rock with a hob can be adjusted according to different sections, and thus the section adaptability is flexible. The disc-shaped hob has a small cutting-based rock breaking load, high performance and high efficiency, and the hob rotates eccentrically, so that the hob can achieve the effect of breaking rock by vibration cutting, thereby further improving the cutting-based rock breaking performance of the hob.

Description

ECCENTRIC HOB TYPE TUNNELING MACHINE CAPABLE OF BREAKING ROCK ACCORDING TO PREDETERMINED PATH WITHOUT AFFECTING SUPPORTING WORK BACKGROUND

Technical Field The present disclosure belongs to the technical field of coal mining, and relates to tunneling machinery equipment, and in particular, to an eccentric hob type tunneling machine capable of breaking rock according to a predetermined path without affecting supporting work.

Description of Related Art ) In 2018, "BP Statistical Review of World Energy" pointed out that: China is still the world's largest energy consumer, accounting for 23.2% of global consumption and 33.6% of global net growth; the consumption of coal resources accounts for 60.4% of the total consumption, and coal resources will play an irreplaceable role as main energy in China for a long period of time in the future. With the increasing demand for coal energy in China, the imbalance of mining proportion due to the difficulty in rock roadway tunneling has become the main reason of restricting coal mining in China. Moreover, nowadays, with the mature application of mechanized coal mining, the mining efficiency has been greatly improved, the imbalance of mining proportion has become more severe, and hard rock tunneling machinery equipment has become the "bottleneck" restricting the coordinated progress of coal mining and roadway tunneling in mines. Especially for hard rock with Platts hardness coefficient f > 10, the impact and wear on a tunneling work mechanism and mounted tools thereof are increased during construction, and due to the space limitation, the working environment of the tunneling equipment is worse, resulting in that the tunneling work mechanism has a poorer hard rock tunneling effect and high tunneling costs.

In the prior art, a drilling and blasting method and mechanical pick-based rock breaking are mostly used for roadway tunneling in coal mines. Although the drilling and blasting method has high efficiency and strong applicability to strata, this method causes large dust and poisonous gas emissions and is prone to major accidents such as gas explosion, and therefore is not conducive to safe, efficient and green mining of ore body resources. Moreover, breaking hard rock with mechanical picks is of great difficulty and a heavy load, the picks are easy to be damaged and need to be replaced frequently, and thus the rock roadway tunneling efficiency is low and the costs are high. Underground tests proved that the approach of breaking rock by cutting with picks is difficult to realize economic tunneling of hard rock roadways.

SUMMARY

Technical Problem

The object of the present disclosure is to provide an eccentric hob type tunneling machine capable of breaking rock according to a predetermined path without affecting supporting work, which makes full use of the features of a small vibration cutting load, high performance and > high efficiency of an eccentric disc-shaped hob, thereby realizing the quick breaking of hard rock and increasing the roadway tunneling speed of coal mines.

Technical Solution

To achieve the above-mentioned object, the present disclosure adopts the following technical solutions: an eccentric hob type tunneling machine capable of breaking rock according to a predetermined path without affecting supporting work, including a crawler walking mechanism, a rack, a hydraulic pump station, a power box, a sliding guide rail base, a propulsion cylinder I, a sliding seat, a transmission box, a hob arm rotating and sliding device, a hob arm, a low-speed high-torque motor, an eccentric disc-shaped hob, a control box, a loading device, a conveying device, a temporary supporting device, and an auxiliary work > platform.

The rack is mounted on the crawler walking mechanism; the hydraulic pump station, the power box, the sliding guide rail base, the temporary supporting device, and the auxiliary work platform are all mounted on the rack, wherein the hydraulic pump station and the power box are located at the tail of the rack and arranged in a bilaterally symmetrical manner; the sliding guide rail base is located on the front ends of the hydraulic pump station and the power box; the loading device is mounted on the front end of the rack; the conveying device is mounted at the middle of the loading device and below the rack; the sliding seat is slidably mounted on the sliding guide rail base, and is connected to the sliding guide rail base through two propulsion cylinders I; the transmission box is mounted on the front end of the sliding seat; two hydraulic motors are symmetrically mounted on a box body of the transmission box; output shafts of the hydraulic motors are connected to transmission box input shafts; gears I mounted on the transmission box input shafts are engaged with gears II mounted on a transmission box output shaft; the hob arm rotating and sliding device is mounted on the front end of the transmission box output shaft; the hob arm rotating and sliding device includes a housing in a rectangular parallelepiped structure; a cylinder mounting plate is fixed to the upper end of the housing; an E-shaped groove is provided in the housing; the hob arm is inserted in the E-shaped groove and connected to the cylinder mounting plate through a propulsion cylinder II; the low-speed high-torque motor is mounted on the front end of the hob arm; and the eccentric disc-shaped hob is eccentrically mounted on the output shaft of the low-speed high-torque motor.

) The propulsion cylinders I, the hydraulic motors, the propulsion cylinder II, the temporary supporting device, and the auxiliary work platform are connected to the hydraulic pump station through hydraulic circuits, respectively; the control box is mounted on the upper end of the power box; and the low-speed high-torque motor and the control box are electrically connected to the power box, respectively.

Wherein, the eccentric hob type tunneling machine breaks rock to the predetermined path without affecting supporting work by using the hydraulic pump station to supply high pressure oil to: the propulsion cylinders I so as to output propulsive force to realize back-and-forth movement of the eccentric disc-shaped hob through the sliding seat; the hydraulic motors so as to output power to realize circumferential movement of the eccentric disc-shaped hob on a ) cutting work face; the propulsion cylinder II so as to output propulsive force and transfer of the same to the eccentric disc-shaped hob through the hob arm to enable the eccentric disc-shaped hob to move in the normal direction non the cutting work face; the temporary supporting device to support a roadway; and the auxiliary work platform to adjust the same to an appropriate height to complete auxiliary work (such as anchoring and protection).

Further, the eccentric disc-shaped hob includes a circular disc-shaped cutter head; the front end of the circular disc-shaped cutter head is inlaid with a plurality of mechanical picks; a plurality of alloy heads are welded on the circumference of the circular disc-shaped cutter head; the rear end of the circular disc-shaped cutter head is machined with a hole for mounting the output shaft of the low-speed high-torque motor; and a keyway is machined in the hole.

Preferably, the axis of the hole is offset from the axis of the circular disc-shaped cutter head by 2-5 cm, so that the eccentric disc-shaped hob will vibrate to a certain extent in a rotation process.

Preferably, the material of the mechanical picks is hard alloy; the mechanical picks are arranged in an Archimedes spiral array on the front end of the circular disc-shaped cutter head, the direction of rotation being counterclockwise.

More preferably, the array has 12 Archimedes spirals in total.

Preferably, the material of the alloy heads is hard alloy, and the alloy heads are equidistantly distributed on the circumference of the circular disc-shaped cutter head.

Preferably, the direction of rotation of the low-speed high-torque motor is counterclockwise, and the load of the mechanical picks during rock breaking can be reduced ) according to the shape of the spirals in the array of the mechanical picks.

Further, the hob arm includes an arm body in a rectangular parallelepiped structure; the front end face of the arm body is provided with two parallel rectangular guide grooves of equal width; and the hob arm is positioned in the hob arm rotating and sliding device through the two rectangular guide grooves.

Further, the temporary supporting device consists of four propulsion cylinders III and an arched supporting shed; the arched supporting shed is mounted on the upper ends of the four propulsion cylinders III; the lower ends of the four propulsion cylinders III are fixedly mounted on the rack; and the four propulsion cylinders III are connected to the hydraulic pump station through hydraulic circuits, respectively.

) Further, the auxiliary work platform consists of four propulsion cylinders IV and a work platform; the work platform is mounted on the upper ends of the four propulsion cylinders IV; the lower ends of the four propulsion cylinders IV are fixedly mounted on the rack; and the four propulsion cylinders IV are connected to the hydraulic pump station through hydraulic circuits, respectively.

Advantageous Effect

Compared with the prior art, the present disclosure has the following beneficial effects:

The present disclosure is simple, compact and reliable in structure and convenient to assemble and disassemble, makes full use of low tensile strength characteristics of hard rock, and has strong rock breaking capability and high efficiency. The route of breaking rock with a hob can be adjusted according to different sections, and thus the section adaptability is flexible. The disc-shaped hob has a small cutting-based rock breaking load, high performance and high efficiency, and the hob rotates eccentrically, so that the hob can achieve the effect of breaking rock by vibration cutting, thereby further improving the cutting-based rock breaking performance of the hob. The front end of the cutter head of the hob is equipped with several mechanical picks, and rock can be partially broken by the picks, so that the hob can perform a cut quickly without being affected by the cutting angle of the hob. The sliding seat moves back and forth, and can not only provide huge propulsive force in the process of partially breaking the rock with the picks, but also realize the breaking of rock of different depths in the case that the tunneling machine is stationary, to avoid the crawler walking mechanism from moving once in every tunneling cycle, thereby improving the efficiency of roadway tunneling; > moreover, during drilling and cutting, the crawler walking mechanism and the rack do not move, and thus do not affect the temporary supporting work and auxiliary work, which is of great significance in realizing the efficient tunneling of hard rock roadways.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of an eccentric hob type tunneling machine capable of breaking rock according to a predetermined path without affecting supporting work according to the present disclosure;

FIG. 2 is a schematic structural diagram of a transmission box according to the present disclosure;

FIG. 3 is a front view, partly in cross section, of a hob arm rotating and sliding device > according to the present disclosure;

FIG. 4 is a left view, partly in cross section, of a hob arm rotating and sliding device according to the present disclosure;

FIG. 5 is an axial view of a housing according to the present disclosure;

FIG. 6 is an axial view of a hob arm according to the present disclosure;

FIG. 7 is a front view, partly in cross section, of an eccentric disc-shaped hob according to the present disclosure;

FIG. 8 is an axial view of an eccentric disc-shaped hob according to the present disclosure; and

FIG. 9 is a schematic diagram of a cutting route of an eccentric disc-shaped hob according to the present disclosure.

DETAILED DESCRIPTION The present disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1, an eccentric hob type tunneling machine capable of breaking rock according to a predetermined path without affecting supporting work in the present disclosure includes a crawler walking mechanism 1, a rack 2, a hydraulic pump station 3, a power box 4, a sliding guide rail base 5, a propulsion cylinder I6, a sliding seat 7, a transmission box 8, a hob arm rotating and sliding device 10, a hob arm 11, a low-speed high-torque motor 12, an eccentric disc-shaped hob 13, a control box 14, a loading device 15, a conveying device 16, a ) temporary supporting device 17, and an auxiliary work platform 18.

The rack 2 is a tie of all components of a tunneling machine of the present disclosure. The crawler walking mechanism 1is mounted below the rack 2 to realize the walking of the tunneling machine. The hydraulic pump station 3, the power box 4, the sliding guide rail base 5, the temporary supporting device 17, and the auxiliary work platform 18 are all mounted on the rack 2, wherein the hydraulic pump station 3 and the power box 4 are located at the tail of the rack 2 and arranged in a bilaterally symmetrical manner. The loading device 15 is mounted on the front end of the rack 2. The conveying device 16 is mounted at the middle of the loading device 15 and below the rack 2 to convey the rock fractured by cutting out of a roadway. The sliding seat 7 is slidably mounted on the sliding guide rail base 5, and is > connected to the sliding guide rail base 5 through two propulsion cylinders I 6. The sliding base 7 can be moved back and forth on the sliding guide rail base 5 by controlling the stretching and retraction of piston rods of the propulsion cylinders I6.

As shown in FIG. 1 and FIG. 2, the transmission box 8 is mounted on the front end of the sliding seat 7. The transmission box includes a box body 8-5. Two hydraulic motors 9 are symmetrically mounted on the box body 8-5 of the transmission box. Two transmission box input shafts 8-1 and one transmission box output shaft 8-4 are provided in the box body 8-5. Output shafts of the hydraulic motors 9 are connected to the transmission box input shafts 8-1. Two gears I8-2 mounted on the transmission box input shafts 8-1 are engaged with two gears II8-3 mounted on the transmission box output shaft 8-4, respectively.

As shown in FIG. 1 and FIG. 3 to FIG. 5, the hob arm rotating and sliding device 10 is mounted on the front end of the transmission box output shaft 8-4. The hob arm rotating and sliding device 10 includes a housing 10-1 in a rectangular parallelepiped structure. A cylinder mounting plate 10-3 is fixed to the upper end of the housing 10-1. An E-shaped groove 10-1-1 is provided in the housing 10-1.

As shown in FIG. 6, the hob arm 11 includes an arm body 11-1 in a rectangular parallelepiped structure. The front end face of the arm body 11-1 is provided with two parallel rectangular guide grooves 11-2 of equal width. The width of the arm body 11-1 is adapted to the width of the E-shaped groove 10-1-1. The hob arm 11 is inserted in the E-shaped groove 10-1-1 and connected to the cylinder mounting plate 10-3 through a propulsion cylinder II 10-2. The hob arm 11 can be slid relative to the hob arm rotating and sliding device 10 by controlling the stretching and retraction of a piston rod of the propulsion cylinder 11 10-2, and > the rotation of the hob arm rotating and sliding device 10 can be realized by controlling rotation angles of the output shafts of the two hydraulic motors 9, thereby enabling the hob arm 11 to produce rotational motion.

As shown in FIG. 1, FIG. 7 and FIG. 8, the low-speed high-torque motor 12 is mounted on one end of the hob arm 11. The eccentric disc-shaped hob 13 includes a circular disc-shaped cutter head 13-1. The front end of the circular disc-shaped cutter head 13-1 is inlaid with a plurality of mechanical picks 13-2. The material of the mechanical picks 13-2 is hard alloy, and thus the hardness is high and the wear resistance is good. The mechanical picks 13-2 are arranged in an Archimedes spiral array on the front end of the circular disc-shaped cutter head 13-1, the direction of rotation being counterclockwise. In this embodiment, the > array has 12 Archimedes spirals in total. A plurality of alloy heads 13-5 are welded on the circumference of the circular disc-shaped cutter head 13-1. The material of the alloy heads 13-5 is hard alloy, and thus the hardness is high and the wear resistance is good. The alloy heads 13-5 are equidistantly distributed on the circumference of the circular disc-shaped cutter head 13-1. The rear end of the circular disc-shaped cutter head 13-1 is machined with a hole 13-3. The axis of the hole 13-3 is offset from the axis of the circular disc-shaped cutter head 13-1 by 2-5 cm. A keyway 13-4 is machined in the hole 13-3. The eccentric disc-shaped hob 13 is eccentrically mounted on the output shaft of the low-speed high-torque motor 12 through the hole 13-3. Due to the eccentric mounting, the eccentric disc-shaped hob 13 will produce certain vibration in a cutting process. The low-speed high-torque motor 12 drives the eccentric disc-shaped hob 13 to drill and cut, in a vibrating manner, hard rock. The cutting route is shown in FIG. 9. The direction of rotation of the low-speed high-torque motor 12 is counterclockwise, and the load of the mechanical picks 13-2 during rock breaking can be reduced according to the shape of the spirals in the array of the mechanical picks 13-2.

In a drilling and cutting process of the eccentric disc-shaped hob 13, the rack 2 can be kept stationary, and motion can be realized by controlling the sliding seat 7 to slide on the sliding guide rail base 5. Therefore, the temporary supporting work and auxiliary work are not affected in the drilling and cutting process of the eccentric disc-shaped hob 13.

As shown in FIG. 1, the temporary supporting device 17 consists of four propulsion cylinders III and an arched supporting shed. The arched supporting shed is mounted on the upper ends of the four propulsion cylinders III. The lower ends of the four propulsion cylinders III are fixedly mounted on the rack. The auxiliary work platform 18 consists of four propulsion cylinders IV and a work platform. The work platform is mounted on the upper ends ) of the four propulsion cylinders IV. The lower ends of the four propulsion cylinders IV are fixedly mounted on the rack.

The propulsion cylinders I6, the hydraulic motors 9, the propulsion cylinder 11 10-2, the propulsion cylinders III, and the propulsion cylinders IV are connected to the hydraulic pump station 3 through hydraulic circuits, respectively, and the hydraulic pump station 3 provides high pressure oil therefor.

The control box 14 is mounted on the upper end of the power box 4, and can control the motion of each part of the tunneling machine according to a preset program. The power box 4 is electrically connected to the low-speed high-torque motor 12 and the control box 14 respectively, and the power box 4 provides electric energy therefor.

) The working principle is as follows: when using the eccentric hob type tunneling machine capable of breaking rock according to a predetermined path without affecting supporting work of the present disclosure to perform roadway tunneling, a working face power system supplies power to the hydraulic pump station 3, and the hydraulic pump station 3 forms high pressure oil after being energized: the high pressure oil is supplied to the propulsion cylinders I6, so that the propulsion cylinders I 6 can output propulsive force to realize back-and-forth movement of the eccentric disc-shaped hob 13 through the sliding seat 7, the transmission box 8, the hob arm rotating and sliding device 10, and the hob arm 11; the high pressure oil is supplied to the hydraulic motors 9, so that the hydraulic motor 9 outputs power to realize circumferential movement of the eccentric disc-shaped hob 13 on a cutting work face through the transmission box input shafts 8-1, the gears I 8-2, the gears II 8-3, the transmission box output shaft 8-4, the hob arm rotating and sliding device 10, and the hob arm 11; the high pressure oil is supplied to the propulsion cylinder 11 10-2, so that the propulsion cylinder II

10-2 can output propulsive force and transfer same to the eccentric disc-shaped hob 13 through the hob arm 11, to enable the eccentric disc-shaped hob 13 to move in the normal direction on the cutting work face; the high pressure oil is supplied to the temporary supporting device 17, so that the temporary supporting device 17 completes the supporting of the roadway; and the high pressure oil is supplied to the auxiliary work platform 18, so that the auxiliary work platform 18 is adjusted to an appropriate height to complete auxiliary work (such as anchoring and protection). The power box 4 provides power for the control box 14 and the low-speed high-torque motor 12. Firstly, a cutting route of the eccentric disc-shaped hob 13 is designed according to the sectional area of the excavated roadway, and is input to > the control box 14. Then, the control box 14 controls the piston rods of the propulsion cylinders I6 to retract to the shortest so that the eccentric disc-shaped hob 13 moves to the rearmost end of the propulsion stroke, controls the piston rod of the propulsion cylinder II 10-2 to retract to the shortest so that the disc-shaped hob 13 is moved to the starting point of the cutting route, and controls the motion of the crawler traveling mechanism 1 so that the tunneling machine is moved as a whole to an appropriate position. The temporary supporting device 17 is controlled to rise to complete the temporary supporting of the roadway. The low-speed high-torque motor 12 is started to rotate the eccentric disc-shaped hob 13, and meanwhile, the piston rods of the propulsion cylinders I6 are controlled to stretch, so that the eccentric disc-shaped hob 13 drills a hole that is 5-10 cm deep in the rock to lock the ) propulsion cylinders I6. Finally, the hydraulic motors 9 and the propulsion cylinder 11 10-2 are simultaneously controlled to make the eccentric disc-shaped hob 13 rotate according to a preset route to break hard rock by cutting, and at the same time when the eccentric disc-shaped hob 13 breaks the hard rock by cutting, the height of the auxiliary work platform can be adjusted, so as to complete some auxiliary work (such as anchoring and protection). After the tunneling of one section is completed, the propulsion cylinders I6, the hydraulic motors 9, and the propulsion cylinder 11 10-2 are readjusted in the same way to proceed to the tunneling of the next section, and the above-mentioned process is repeated continuously. When stretched to the longest positions, the piston rods of the propulsion cylinders I 6 exit the temporary supporting device 17, and the piston rods of the propulsion cylinders I 6 are retracted to shortest. By controlling the crawler walking mechanism 1, the tunneling machine is moved forward to an appropriate position to continue the tunneling work. This process is repeated over and over until the tunneling is completed. In the above-mentioned roadway tunneling process, the fractured and broken stones are conveyed out of the roadway through the loading device 15 and the conveying device 16.

The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that such prior art forms part of the common general knowledge.

It will be understood that the terms "comprise" and "include" and any of their derivatives (e.g. comprises, comprising, includes, including) as used in this specification, and the claims that follow, is to be taken to be inclusive of features to which the term refers, and is not meant to exclude the presence of any additional features unless otherwise stated or implied.

In some cases, a single embodiment may, for succinctness and/or to assist in understanding the scope of the disclosure, combine multiple features. It is to be understood > that in such a case, these multiple features may be provided separately (in separate embodiments), or in any other suitable combination. Alternatively, where separate features are described in separate embodiments, these separate features may be combined into a single embodiment unless otherwise stated or implied. This also applies to the claims which can be recombined in any combination. That is a claim may be amended to include a feature defined in any other claim. Further a phrase referring to "at least one of' a list of items refers to any combination of those items, including single members. As an example, "at least one of: a, b, or c" is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c.

It will be appreciated by those skilled in the art that the disclosure is not restricted in its use to the particular application or applications described. Neither is the present disclosure > restricted in its preferred embodiment with regard to the particular elements and/or features described or depicted herein. It will be appreciated that the disclosure is not limited to the embodiment or embodiments disclosed, but is capable of numerous rearrangements, modifications and substitutions without departing from the scope as set forth and defined by the following claims.

Claims

CLAIMS What is claimed is:

1. An eccentric hob type tunneling machine capable of breaking rock according to a

predetermined path without affecting supporting work, comprising a crawler walking

mechanism, a rack, a hydraulic pump station, a power box, a sliding guide rail base, a

propulsion cylinder I, a sliding seat, a transmission box, a hob arm rotating and sliding device,

a hob arm, a low-speed high-torque motor, an eccentric disc-shaped hob, a control box, a

loading device, a conveying device, a temporary supporting device, and an auxiliary work

platform;

the rack being mounted on the crawler walking mechanism; the hydraulic pump station, the

power box, the sliding guide rail base, the temporary supporting device, and the auxiliary

work platform being all mounted on the rack, wherein the hydraulic pump station and the

power box are located at the tail of the rack and arranged in a bilaterally symmetrical manner;

the sliding guide rail base is located on the front ends of the hydraulic pump station and the

power box; the loading device is mounted on the front end of the rack; the conveying device

is mounted at the middle of the loading device and below the rack; the sliding seat is slidably

mounted on the sliding guide rail base, and is connected to the sliding guide rail base through

two propulsion cylinders I; the transmission box is mounted on the front end of the sliding

seat; two hydraulic motors are symmetrically mounted on a box body of the transmission box;

output shafts of the hydraulic motors are connected to transmission box input shafts; gears I

mounted on the transmission box input shafts are engaged with gears II mounted on a

transmission box output shaft; the hob arm rotating and sliding device is mounted on the front

end of the transmission box output shaft; the hob arm rotating and sliding device comprises a

housing in a rectangular parallelepiped structure; a cylinder mounting plate is fixed to the

upper end of the housing; an E-shaped groove is provided in the housing; the hob arm is

inserted in the E-shaped groove and connected to the cylinder mounting plate through a

propulsion cylinder II; the low-speed high-torque motor is mounted on the front end of the

hob arm; and the eccentric disc-shaped hob is eccentrically mounted on the output shaft of the

low-speed high-torque motor; the propulsion cylinders I, the hydraulic motors, the propulsion cylinder II, the temporary supporting device, and the auxiliary work platform are connected to the hydraulic pump station through hydraulic circuits, respectively; the control box is mounted on the upper end of the power box; and the low-speed high-torque motor and the control box are electrically connected to the power box, respectively; wherein, the eccentric hob type tunneling machine breaks rock to the predetermined path without affecting supporting work by using the hydraulic pump station to supply high pressure oil to: the propulsion cylinders I so as to output propulsive force to realize back-and-forth movement of the eccentric disc-shaped hob through the sliding seat; the hydraulic motors so as to output power to realize circumferential movement of the eccentric disc-shaped hob on a cutting work face; the propulsion cylinder II so as to output propulsive force and transfer of the same to the eccentric disc-shaped hob through the hob arm to enable the eccentric disc-shaped hob to move in the normal direction non the cutting work face; the temporary supporting device to support a roadway; and the auxiliary work platform to adjust the same to an appropriate height to complete auxiliary work (such as anchoring and protection).

2. The eccentric hob type tunneling machine capable of breaking rock according to a

predetermined path without affecting supporting work according to claim 1, wherein the

eccentric disc-shaped hob comprises a circular disc-shaped cutter head; the front end of the

circular disc-shaped cutter head is inlaid with a plurality of mechanical picks; a plurality of

alloy heads are welded on the circumference of the circular disc-shaped cutter head; the rear

end of the circular disc-shaped cutter head is machined with a hole for mounting the output

shaft of the low-speed high-torque motor; and a keyway is machined in the hole.

3. The eccentric hob type tunneling machine capable of breaking rock according to a

predetermined path without affecting supporting work according to claim 2, wherein the axis

of the hole is offset from the axis of the circular disc-shaped cutter head by 2-5 cm.

4. The eccentric hob type tunneling machine capable of breaking rock according to a

predetermined path without affecting supporting work according to claim 2, wherein the

material of the mechanical picks is hard alloy, and the mechanical picks are arranged in an

Archimedes spiral array on the front end of the circular disc-shaped cutter head, the direction

of rotation being counterclockwise.

5. The eccentric hob type tunneling machine capable of breaking rock according to a

predetermined path without affecting supporting work according to claim 4, wherein the array

has 12 Archimedes spirals in total.

6. The eccentric hob type tunneling machine capable of breaking rock according to a

material of the alloy heads is hard alloy, and wherein each of the alloy heads are equidistantly

distributed from one another on the circumference of the circular disc-shaped cutter head.

7. The eccentric hob type tunneling machine capable of breaking rock according to a

predetermined path without affecting supporting work according to any one of the preceding

claims, wherein the direction of rotation of the low-speed high-torque motor is

counterclockwise.

8. The eccentric hob type tunneling machine capable of breaking rock according to a

claims, wherein the hob arm comprises an arm body in a rectangular parallelepiped structure;

the front end face of the arm body is provided with two parallel rectangular guide grooves of

equal width; and the hob arm is positioned in the hob arm rotating and sliding device through

the two rectangular guide grooves.

9. The eccentric hob type tunneling machine capable of breaking rock according to a

claims, wherein the temporary supporting device consists of four propulsion cylinders III and

an arched supporting shed; the arched supporting shed is mounted on the upper ends of the

four propulsion cylinders III; the lower ends of the four propulsion cylinders III are fixedly

mounted on the rack; and the four propulsion cylinders III are connected to the hydraulic pump station through hydraulic circuits, respectively.

10. The eccentric hob type tunneling machine capable of breaking rock according to a

claims, wherein the auxiliary work platform consists of four propulsion cylinders IV and a

work platform; the work platform is mounted on the upper ends of the four propulsion

cylinders IV; the lower ends of the four propulsion cylinders IV are fixedly mounted on the

rack; and the four propulsion cylinders IV are connected to the hydraulic pump station

through hydraulic circuits, respectively.