1. A cutter head for a full-face tunneling machine is characterized in that a plurality of hob devices are arranged in the radial direction of the cutter head,

and a drilling device is arranged at the outer edge of the cutter head.

2. The cutter head according to claim 1, wherein the drilling device comprises a box body, a mounting seat, a driving device, a drill bit and a drill rod, the box body is fixed on the cutter head, the mounting seat is arranged in the box body, the driving device is fixed on the mounting seat, the drill rod is connected on the driving device, the drill bit is fixed at the end part of the drill rod,

alternatively, the drilling device is a hydraulic rock drill, or a down-the-hole hammer, or a demolition hammer.

3. The cutterhead according to claim 2, wherein the drilling apparatus is a gang drill, the drive is a gang drill drive, and the drill head and the drill pipe are plural.

4. The cutter head of claim 1 wherein said drilling means are plural and are disposed at equal angles on said cutter head.

5. The cutter head of claim 1 wherein each of said hob means is progressively convex from the center of the circle to the outer edge.

6. A full face tunnel boring machine for percussive gang drill and hob rock breaking, comprising a cutter head, characterized in that the cutter head is as claimed in any one of the preceding claims 1-5.

7. The full face tunneling machine for rock breaking with percussion gang drill and hobbing cutter of claim 6, further comprising a shield and a slag tapping device, wherein said cutterhead is disposed on said shield, and said slag tapping device is built in said shield.

8. A method of breaking rock, using a cutter head according to any one of claims 1 to 5, comprising:

step 1), the cutter head does not rotate, all the drilling devices at the outer edge part of the cutter head start to work, and holes are drilled on the palm surface;

step 2) after the current group of drill holes are finished, the drill bit retracts into the cutter head, then the cutter head rotates for a certain angle, the next group of drill holes of the drilling device are adjacent to the current group of drill holes, and then the drilling device is started again to finish the second group of drill holes;

step 3) repeating the step 2) until the peripheral drilling of the whole face is completed, and the face is separated from the peripheral surrounding rock;

step 4), the drill bit is retracted into the cutter head, and the cutter head rotates and tunnels forwards;

and 5) completing one round of propulsion after the tunneling is completed to the drilling depth, and then repeating the steps 1) to 4) until the tunneling of the whole tunnel is completed.

9. A rock breaking method according to claim 8, wherein when the drilling apparatus is a gang drill apparatus:

step 1), the cutter head does not rotate, all the gang drill devices at the outer edge part of the cutter head start to work, and holes are drilled on the palm surface to form slots;

step 2) after the gang drilling device finishes the current group of slotted holes, the drill bit backs to the cutter head, then the cutter head rotates for a certain angle, so that the next group of slotted holes of the gang drilling device is adjacent to the current group of slotted holes, and then the gang drilling device is started again to finish the drilling of the second group of slotted holes;

step 3) repeating the step 2) until the peripheral slotted holes of the whole face are drilled, and separating the face from peripheral surrounding rocks;

step 4) retracting all the gang drill devices, and enabling the cutter head to rotate and tunnel forwards;

and 5) completing one round of propulsion after the tunneling is completed to the drilling depth of the gang drill device, and then repeating the steps 1) to 4) until the tunneling of the whole tunnel is completed.

10. The rock breaking method according to claim 8, wherein the step 4) further comprises that each of the hob devices is gradually protruded from the circle center to the outer edge, and during the tunneling process of the rotation and forward tunneling of the cutterhead, the hob at the outer edge of the cutterhead firstly contacts the tunnel face and crushes the outermost rock,

then the adjacent inner ring hob cutter contacts the face to continuously crush the inner ring rock,

and by analogy, in the tunneling process, the tunnel face is sequentially crushed from the outer edge to the center.

Background

In the tunnel construction field, the shield constructs the machine and carries out the tunnel construction and has degree of automation height, use manpower sparingly, construction speed is fast, one-time tunnel forming, do not receive the weather influence, steerable ground subsides during the excavation, reduce the influence to the ground building and do not influence characteristics such as surface of water traffic when excavating under water, under the longer condition of tunnel line, buried depth is great, construct more economical and reasonable with the shield structure machine. However, for the excavation construction of hard rock and ultra-hard rock, the TBM tunneling speed is still very slow, particularly, the rock near the center of the cutter head is extremely difficult to crush, and the cutter is seriously damaged, so that the construction cost and the energy consumption are huge.

In the tunneling process of the TBM, a hob on a cutterhead is used for cutting and breaking rock in a rolling mode, the hob on the cutterhead rotates along with the cutterhead in the radial direction under the action of a driving system, and the hob cuts into rock on a tunnel face and extrudes and breaks the rock under the action of propelling force. However, the rotation speed of the cutter head is very slow, usually 10r/min, the generated impact load is small, and compared with a hydraulic impactor, such as a down-the-hole hammer and a rock drill, the impact load is negligible, so that the efficiency of the cutter head in crushing hard rock or superhard rock is low, and the linear speed of the hob is lower closer to the central position of the cutter head, the generated impact load is lower, the difficulty in crushing rock at the central position of a tunnel face is great, the abrasion of the cutter is serious, and the tunneling efficiency is low.

Therefore, how to provide a cutter head to improve the rock breaking efficiency and prolong the service life is a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of the above, the present invention provides a cutter head to improve rock breaking efficiency and prolong service life. The invention also aims to provide a full-face tunneling machine and a rock breaking method for breaking rock by adopting the impact gang drill and the hob of the cutter head.

In order to achieve the purpose, the invention provides the following technical scheme:

a cutter head is used for a full-face tunneling machine, a plurality of hob devices are arranged in the radial direction of the cutter head,

and a drilling device is arranged at the outer edge of the cutter head.

Preferably, the drilling device comprises a box body, a mounting seat, a driving device, a drill bit and a drill rod, wherein the box body is fixed on the cutter head, the mounting seat is arranged in the box body, the driving device is fixed on the mounting seat, the drill rod is connected on the driving device, and the drill bit is fixed at the end part of the drill rod.

Alternatively, the drilling device is a hydraulic rock drill, or a down-the-hole hammer, or a demolition hammer.

Preferably, the drilling device is a gang drill, the driving device is a gang drill driving device, and the drill bit and the drill rod are both multiple.

Preferably, the driving device is a hydraulic impact rock breaking device.

Preferably, the drilling devices are arranged on the cutter head in a plurality of equal included angles.

Preferably, each of the hob devices is gradually convex from the circle center to the outer edge.

The invention also provides a full-face tunneling machine for rock breaking by using the percussion gang drill and the hob, which comprises a cutter head, wherein the cutter head is the cutter head described in any item above.

Preferably, foretell full face entry driving machine that strikes gang drill and broken rock of hobbing cutter still includes the shield body and slag discharging device, the blade disc sets up on the shield body, the slag discharging device is built-in the shield body.

The invention also provides a rock breaking method, which adopts the cutter head as any one of the above, and comprises the following steps:

step 1), the cutter head does not rotate, all the drilling devices at the outer edge part of the cutter head start to work, and holes are drilled on the palm surface;

step 2) after the current group of drill holes are finished, the drill bit retracts into the cutter head, then the cutter head rotates for a certain angle, the next group of drill holes of the drilling device are adjacent to the current group of drill holes, and then the drilling device is started again to finish the second group of drill holes;

step 3) repeating the step 2) until the peripheral drilling of the whole face is completed, and the face is separated from the peripheral surrounding rock;

step 4), the drill bit is retracted into the cutter head, and the cutter head rotates and tunnels forwards;

and 5) completing one round of propulsion after the tunneling is completed to the drilling depth, and then repeating the steps 1) to 4) until the tunneling of the whole tunnel is completed.

Preferably, when the drilling device is a gang drill device:

step 1), the cutter head does not rotate, all the gang drill devices at the outer edge part of the cutter head start to work, and holes are drilled on the palm surface to form slots;

step 2) after the gang drilling device finishes the current group of slotted holes, the drill bit backs to the cutter head, then the cutter head rotates for a certain angle, so that the next group of slotted holes of the gang drilling device is adjacent to the current group of slotted holes, and then the gang drilling device is started again to finish the drilling of the second group of slotted holes;

step 3) repeating the step 2) until the peripheral slotted holes of the whole face are drilled, and separating the face from peripheral surrounding rocks;

step 4) retracting all the gang drill devices, and enabling the cutter head to rotate and tunnel forwards;

and 5) completing one round of propulsion after the tunneling is completed to the drilling depth of the gang drill device, and then repeating the steps 1) to 4) until the tunneling of the whole tunnel is completed.

Preferably, the step 4) further comprises that each hob device gradually protrudes from the circle center to the outer edge, and in the tunneling process that the cutterhead rotates and tunnels forwards, the hob at the outer edge of the cutterhead firstly contacts the tunnel face and crushes the rocks at the outermost circle,

then the adjacent inner ring hob cutter contacts the face to continuously crush the inner ring rock,

and by analogy, in the tunneling process, the tunnel face is sequentially crushed from the outer edge to the center.

The cutter head provided by the invention is used for a full-face tunneling machine, a plurality of hob devices are arranged in the radial direction of the cutter head,

and a drilling device is arranged at the outer edge of the cutter head.

When the rock breaking device is used, the cutter head does not rotate, all the drilling devices at the outer edge of the cutter head start to work, holes are drilled on the face, after the current group of drilled holes are completed, the cutter head rotates by a certain angle to enable the next group of drilled holes of the drilling devices to be adjacent to the current group of drilled holes, the second group of drilled holes are completed, finally, the face and the surrounding rocks are separated to form an empty face, peripheral slotted holes are firstly dug on the face through the drilling devices to form the empty face, the face is isolated from the surrounding rocks, and then the rocks are broken through the hobbing cutters.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a full-face heading machine for rock breaking by percussion gang drilling and a hob provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a drilling device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a cutter head provided in an embodiment of the invention;

fig. 4 is a schematic structural diagram of a full-face tunnel boring machine for rock breaking by percussion gang drilling and hobbing provided by the embodiment of the invention;

FIG. 5 is a schematic structural view of a face formed by separating a face from surrounding rock according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a face hob rock breaking operation according to an embodiment of the present invention.

In the above FIGS. 1-6:

the device comprises a cutter head 1, a box body 11, a mounting seat 12, a gang drill 13, a shaping device 14, a drill bit 15, a hob device 16, a shield body 2, a slag discharging mechanism 3, a rock body 4, a slotted hole 5 and a hob rock breaking action position 6.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 6, fig. 1 is a schematic structural diagram of a full-face heading machine for percussion gang drilling and hob rock breaking according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a drilling device according to an embodiment of the present invention; FIG. 3 is a schematic structural diagram of a cutter head provided in an embodiment of the invention; fig. 4 is a schematic structural diagram of a full-face tunnel boring machine for rock breaking by percussion gang drilling and hobbing provided by the embodiment of the invention; FIG. 5 is a schematic structural view of a face formed by separating a face from surrounding rock according to an embodiment of the present invention; fig. 6 is a schematic structural diagram of a face hob rock breaking operation according to an embodiment of the present invention.

The cutter head 1 provided by the embodiment of the invention is used for a full-face tunneling machine, a plurality of hob devices 16 are arranged in the radial direction of the cutter head 1,

the outer edge of the cutter head 1 is provided with a drilling device, the drilling device comprises a box body 11, a mounting seat 12, a driving device, a drill bit 15 and a drill rod, the box body 11 is fixed on the cutter head 1, the mounting seat 12 is arranged in the box body 11, the driving device is fixed on the mounting seat 12, the drill rod is connected to the driving device, and the drill bit 15 is fixed at the end of the drill rod, or the drilling device is a hydraulic rock drill, a down-the-hole hammer or a breaking hammer.

When the rock drilling device is used, the cutter head 1 does not rotate, all the drilling devices on the outer edge of the cutter head 1 start to work, holes are drilled in the palm face rock mass 4, after the current group of drilled holes are completed, the cutter head 1 rotates by a certain angle, so that the next group of drilled holes of the drilling devices are adjacent to the current group of drilled holes, the second group of drilled holes are completed, finally, the palm face and the peripheral surrounding rocks are separated to form an empty face, peripheral slotted holes 5 are firstly dug on the palm face through the drilling devices to form the empty face, the palm face is isolated from the peripheral surrounding rocks, and then the rocks are broken through the hobbing cutters.

In order to further optimize the scheme, the drilling device is a gang drill 13, the driving device is a gang drill driving device, and the drill bit 15 and the drill rod are both multiple. Wherein, drilling equipment is a plurality of and be the contained angle setting such as on blade disc 1. Further improving efficiency.

To further optimize the above solution, each hob device 16 is gradually convex from the centre of the circle to the outer edge. Namely, the hob on the cutterhead 1 is arranged in a mode that the outer ring is convex and the center is concave, so that the hob on the outer ring firstly contacts with rocks to break the rocks in the tunneling process of the cutterhead 1. After the outside rock is broken, the adjacent inside hob touches the inside rock again to break the rock, and so on, so that the face rock 4 is broken from the outside to the center in sequence. By the arrangement, all the hobs can avoid three-dimensional stress, so that the rock breaking efficiency is improved, the tunneling speed is improved, the cutter and energy loss are reduced, the damage to the surrounding rock strength is reduced, and the supporting strength is ensured.

Specifically, the driving device is hydraulic impact rock breaking equipment.

The embodiment of the invention also provides a full-face tunneling machine for percussion gang drilling and hob rock breaking, which comprises a cutter head, wherein the cutter head is the cutter head 1 in any one of the above embodiments.

Specifically, the full-face tunneling machine for rock breaking by impact gang drill and hobbing cutter further comprises a shield body 2 and a slag discharging device 3, wherein the cutter head 1 is arranged on the shield body 2, and the slag discharging device 3 is arranged in the shield body 2.

The embodiment of the invention further provides a rock breaking method, which adopts the cutter head in any one of the above embodiments, and comprises the following steps:

step 1), the cutter head 1 does not rotate, all the drilling devices at the outer edge part of the cutter head 1 start to work, and holes are drilled on the palm surface;

step 2) after the current group of drill holes are finished, the drill bit 15 retracts into the cutter head 1, then the cutter head 1 rotates for a certain angle, the next group of drill holes of the drilling device are adjacent to the current group of drill holes, and then the drilling device is started again to finish the second group of drill holes;

step 3) repeating the step 2) until the peripheral drilling of the whole face is completed, and separating the face from the peripheral surrounding rock is completed;

step 4), retracting the drill bit 15 into the cutter head 1, rotating the cutter head 1 and tunneling forwards;

and 5) completing one round of propulsion after the tunneling is completed to the drilling depth, and then repeating the steps 1) to 4) until the tunneling of the whole tunnel is completed.

In order to further optimize the above solution, when the drilling device is a gang drilling device:

step 1), the cutter head 1 does not rotate, all the gang drill devices at the outer edge part of the cutter head 1 start to work, and holes are drilled on the palm surface to form slots, so that slot holes 5 are formed;

step 2) after the gang drilling device finishes the current group of slotted holes 5, the drill bit 15 backs to the cutter head 1, then the cutter head 1 rotates for a certain angle, so that the next group of slotted holes of the gang drilling device is adjacent to the current group of slotted holes, and then the gang drilling device is started again to finish the drilling of the second group of slotted holes 5;

step 3) repeating the step 2) until the peripheral slotted holes 5 of the whole face are drilled, and separating the face from the peripheral surrounding rock;

step 4) returning all the gang drill devices, and enabling the cutter head 1 to rotate and advance;

and 5) completing one round of propulsion after the tunneling is completed to the drilling depth of the gang drill device, and then repeating the steps 1) to 4) until the tunneling of the whole tunnel is completed.

In order to further optimize the scheme, the step 4) further comprises that each hobbing cutter device 16 gradually protrudes from the circle center to the outer edge, in the tunneling process that the cutterhead 1 rotates and tunnels forwards, the hobbing cutter on the outer edge of the cutterhead 1 firstly contacts the tunnel face and crushes the rocks on the outermost circle,

then the adjacent inner ring hob contacts the face and continues crushing the inner ring rock, as shown in fig. 6, the rock breaking action position 6 of the hob is shown in fig. 6,

in the process of tunneling, the tunnel face is broken from the outer edge to the center in sequence.

The cutter head 1 provided by the embodiment of the invention can solve the problems that the disturbance to surrounding rocks is large in the tunneling process of the tunneling machine, the cutter head cutter is not uniformly worn, for example, the abrasion of a central hob is larger than that of an outer ring hob, the rock breaking efficiency is further improved, and the cutter abrasion is reduced.

The cutter head 1 provided by the embodiment of the invention takes a drilling device as an example of a gang drill 13, and during specific operation:

the invention provides a cutter head for breaking rock by combining gang drill equipment and a hob, which comprises: the rotary cutter comprises a cutter head 1, a gang drill device and a hob device 16, wherein the gang drill device comprises a gang drill box body, a gang drill mounting seat, a gang drill 13, a shaping device 14, a drill bit 15 and a drill rod. The plurality of gang drill devices are uniformly distributed on the outermost ring of the cutter head 1. The gang drill 13 is a hydraulic impact rock breaking device and is provided with a plurality of drill rods, so that the effect of multi-cavity grooving in one-time drilling can be realized, and meanwhile, the center distance is small, and the drilling can be performed along the edge of the tunnel profile perpendicular to the face.

The hob device 16 is arranged along the radius of the cutter head 1, and the hob position gradually protrudes outwards from the center to the outer ring, so that in the tunneling process, the hob on the outer ring of the cutter head 1 contacts with the rock firstly, and then the hob on the adjacent inner ring contacts with the rock until the central hob contacts with the rock finally.

The full-face tunneling machine for rock breaking by combining impact gang drilling and hobbing cutters of the cutter head 1 provided by the embodiment of the invention comprises the following construction steps:

the first step is as follows: the cutter head 1 does not rotate, the outermost gang drill 13 starts to drill holes simultaneously, the holes are drilled to the palm surface under the action of the mounting seat 12 and the driving device to form grooves, and the drill bit retracts after drilling to a certain depth;

secondly, the following steps: after the gang drill 13 finishes a group of slotted holes, the gang drill 13 is driven by the mounting seat 12 to retreat into the cutter head 1, then the cutter head 1 rotates for a certain angle, the gang drill 13 starts to drill a second group of holes, and the second group of holes are adjacent to the first group of holes, namely the next group of slotted holes of the gang drill 13 are adjacent to the previous group of slotted holes, then the gang drill 13 is started again to finish the drilling of the second group of slotted holes;

the third step is: repeating the first step and the second step until all holes drilled by the gang drill 13 are connected, completing the grooving on the periphery of the face, forming a blank surface and separating from surrounding rocks on the periphery;

the fourth step: the gang drill rig is withdrawn and the cutterhead 1 begins to rotate at a speed and is driven forward. Because the hob is arranged in a convex central concave manner, rock on the tunnel face can be sequentially broken from the outer ring to the center, namely, in the tunneling process, the hob on the outer ring firstly contacts the tunnel face and crushes the rock on the outermost ring. And then, the adjacent inner ring hobs contact the face, the inner ring rock is crushed continuously, and the face is crushed from the outside to the center in sequence. After the tunneling is completed to the drilling depth, completing one-round tunneling, stopping the rotation of the cutter head 1, and conveying broken rocks out of the tunnel by the slag discharging mechanism 3 in the tunneling process;

the fifth step: and repeating the first step to the fourth step until the tunneling of the whole tunnel is completed.

Because the gang drill 13 can drill the connecting holes and grooves in sequence, the peripheral holes can be drilled through the gang drill 13, the groove forming efficiency of the peripheral holes can be effectively improved, the face and the peripheral surrounding rock can be quickly separated, the strength of the face is reduced, and meanwhile, the impact rock breaking efficiency is higher than that of a hob, the peripheral expanding and excavating cutter can be replaced, and the types of cutters are reduced.

And because the central rock has high strength and the periphery, the abrasion of the central hob is larger than that of the peripheral hob in the tunneling process. Therefore, the arrangement mode of the hobbing cutters with convex centers and concave centers is adopted, the rock on the tunnel face can be sequentially crushed from the outside to the center, and the strength of the center rock is gradually reduced, so that the abrasion of the cutters is reduced, the tunneling speed is improved, and the tunneling cost is reduced.

The full-section tunneling machine for rock breaking by using the percussion gang drill and the hob provided by the embodiment of the invention adopts the combination of the gang drill and the hob to break rock, and comprises a cutter head 1, a shield body 2 and a slag discharging device 3;

the cutter head 1 comprises a hob device 16 and a gang drill device. The gang drill device comprises a gang drill box body, a gang drill mounting seat, a gang drill 13, a shaping device 14, a drill bit 15 and a drill rod. Wherein, the gang drill box body is fixed on the cutter head 1, and plays a role in protecting the gang drill equipment. The gang drill mounting seat is used for mounting gang drill equipment, is connected with a driving device through a pipeline and is responsible for propelling the gang drill to drill holes on a face. The gang drill 13 is a hydraulic impact rock breaking device, has a plurality of drill rods, can realize the effect of drilling multiple hollow grooves at one time, has a small edge-to-center distance, can drill holes along the edge of the tunnel profile perpendicular to the face, and is described in the embodiment by taking a four-rod gang drill as an example. The shaping device 14 is a shaping plate and is arranged behind a drill bit 15 of the gang drill 13 and is responsible for removing underdug areas between adjacent holes of the gang drill, so that the outer edge of a groove is smooth, and the subsequent pushing of the shield body 2 is ensured.

The arrangement of the hob device 16 and the gang drill device on the cutter head 1 can be referred to as shown in fig. 3, the gang drill device is uniformly distributed on the outermost ring of the cutter head 1, and the number of the gang drill device can be determined according to actual requirements. The arrangement number of the hobs can be 16, and the hobs can be arranged along the radius of the cutterhead 1 according to the requirements of rock strength grade, tunnel face size and the like, but the hobs on one line on the cutterhead 1 are arranged in an arc line mode of concave in the middle and convex in the outer ring, so that in the tunneling process, the hobs on the outer ring of the cutterhead 1 contact with the rock firstly, then the hobs on the adjacent inner ring contact with the rock, and the central hob finally contacts with the rock.

The embodiment of the invention provides a full-face tunneling machine for rock breaking by percussion gang drilling and hobbing cutters, which comprises the following components in parts by weight:

firstly, the rock-breaking efficiency of impact is higher than that of a hob, a gang drill 13 is arranged on the outermost side of a cutter head 1, and the outer diameter of a peripheral slotted hole can be equal to the diameter of a shield body 2 by matching with a proper drill bit 15 by utilizing the characteristic of small edge center distance of the gang drill 13, so that the purpose of replacing a peripheral expanding excavation cutter is achieved, and the peripheral rock-breaking efficiency is improved;

and secondly, before tunneling, a peripheral slotted hole is drilled by using a gang drill to form an empty face, and the tunnel face is isolated from peripheral surrounding rocks, so that the disturbance to the surrounding rocks in subsequent construction is reduced. After the free face is formed, the strength of the outermost rock of the face is reduced, and the outer ring hob is not stressed in three directions any more, so that the rock breaking efficiency of the outer ring hob is increased, and the cutter and energy loss are reduced;

thirdly, because the strength of the outermost rock is reduced, the hob on the cutterhead 1 is arranged into an arc arrangement form with a convex outer ring and a concave center, so that the outer ring hob firstly contacts the rock in the tunneling process of the cutterhead 1 to break the rock. After the outside rock is broken, the adjacent inside hob touches the inside rock again to break the rock, and so on, so that the face rock is broken from the outside to the center in sequence. By the arrangement, all the hobs can avoid three-dimensional stress, so that the rock breaking efficiency is improved, the tunneling speed is improved, the cutter and energy loss are reduced, the damage to the surrounding rock strength is reduced, and the supporting strength is ensured.

In the process of removing the peripheral slotted holes, the drilling device can replace the drill bit 15 and the drill rod by adopting other common rock drilling equipment such as a hydraulic rock drill, a down-the-hole hammer, a breaking hammer and the like, so that the same effects of removing the peripheral holes to form a free face and weakening the strength of a rock body are achieved, and the effects of cost, efficiency and the like are different;

besides arranging the hob cutters on the cutter head 1 in an arc shape, the front end face of the cutter head 1 can be directly designed to be concave, or the effect that the outer ring hob cutter firstly contacts with the rock and the middle hob cutter finally contacts with the rock can be achieved in other modes.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.