Cutting mechanism and roadheader

Abstract

The present invention provides a cutting mechanism and a roadheader. The cutting mechanism includes a main shaft assembly, a cantilever outer cylinder, and a cutting head. A gap is left between the cantilever outer cylinder and the main shaft assembly to form a cavity. One end of the cavity is sealed between the cantilever outer cylinder and the main shaft assembly, and a first channel communicating with the cavity is formed at the other end. The cutting head includes a head and a cylindrical portion sleeved outside the cantilever outer cylinder. The head is fixedly connected to the main shaft assembly. A gap is left between the cylindrical portion and the cantilever outer cylinder to form a second channel communicating with the first channel, and the second channel can communicate with the outside of the cantilever outer cylinder. In the cutting mechanism and the roadheader of the present invention, the lubricating oil injected into the cavity is extruded to the outside of the cantilever outer cylinder through the first channel and the second channel, so that the lubricating oil is continuously injected into and flows out of the cavity. On the one hand, the flow of the lubricating oil realizes its lubricating function, and on the other hand, it can block the spray water from invading the cavity and prevent components such as bearings from being damaged too quickly, thereby ensuring the long-term normal operation of the cutting mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of underground tunneling equipment, and particularly to a cutting mechanism and a roadheader. Background Art

[0002] A roadheader is a comprehensive device that performs continuous operations of mechanically breaking rocks, discharging muck, and supporting. With the rapid development of the national economy and the continuous acceleration of the urbanization process in China, in the next quite long period, tunnel projects such as urban subway tunnels, hydraulic tunnels, cross-river tunnels, railway tunnels, highway tunnels, and municipal pipelines in the country will develop vigorously, and a large number of tunnel roadheaders will be applied. In addition, roadheaders are also needed in coal mining.

[0003] As Figure 1 shown, a cutting mechanism includes a main shaft 91, an outer cylinder 93, a cutting head 95, and a water spraying device 97. The main shaft 91 is arranged outside the outer cylinder 93, and the cutting head 95 is connected to the main shaft 91 to work by rotating with the main shaft 91. The water spraying device 97 includes a water inlet pipe 972 and a rotary water seal 974. The water inlet pipe 972 is arranged on the outer cylinder 93, and the rotary water seal 974 is arranged on the main shaft 91 to introduce water from the water inlet pipe 972 into the interior of the main shaft 91 for internal spraying of the cutting head 95. The front end 98 rotating with the main shaft 91 and the outer cylinder 93 are sealed by a floating oil seal 992 and a V-shaped sealing ring 993, and the cutting head 95 and the outer cylinder 93 are sealed by a packing seal 994. A spherical roller bearing 995 and a cylindrical roller bearing 996 are sleeved between the main shaft 91 and the outer cylinder 93, and lubricating oil is injected between the main shaft 91 and the outer cylinder 93 for lubrication. However, in this cutting mechanism, due to the relative rotation between the front end 98 and the outer cylinder 93, the floating oil seal 992 is extremely easy to be damaged, and the sealing performance of the packing seal and the V-shaped sealing ring 993 is poor. Therefore, the spraying water will invade the cavity between the main shaft 91 and the outer cylinder 93 (the water invasion route is as shown by the dotted arrow in Figure 1 ), and the invasion of water will cause bearing damage, and the cutting mechanism cannot work normally. Moreover, the conditions in the tunnel are harsh and it is difficult to replace the bearings, which will seriously affect the project progress. Summary of the Invention

[0004] The object of the present invention is to provide a cutting mechanism and a roadheader with good sealing effect and capable of ensuring normal operation.

[0005] The present invention provides a cutting mechanism, which includes a main shaft assembly, a cantilever outer cylinder, and a cutting head. The cantilever outer cylinder is rotatably sleeved outside the main shaft assembly, and a gap is left between the cantilever outer cylinder and the main shaft assembly to form a cavity. One end of the cavity is sealed between the cantilever outer cylinder and the main shaft assembly, and a first channel communicating with the cavity is formed at the other end between the cantilever outer cylinder and the main shaft assembly. The cutting head includes a head and a cylindrical part sleeved outside the cantilever outer cylinder. The head is fixedly connected to the main shaft assembly, and a gap is left between the cylindrical part and the cantilever outer cylinder to form a second channel communicating with the first channel. The second channel can communicate with the outside of the cantilever outer cylinder.

[0006] In one embodiment, the cutting mechanism further includes an oil injection device, and the oil injection device is communicated with the cavity to inject oil into the cavity.

[0007] In one embodiment, the oil injection device includes an oil injection pipe and an oil pump. The oil injection pipe is arranged on the cantilever outer cylinder, and one end of the oil injection pipe extends into the cantilever outer cylinder to communicate with the cavity, and the other end extends out of the cantilever outer cylinder to communicate with the oil pump; the cutting mechanism further includes a water spraying device, and the water spraying device includes a water injection pipe and a rotary water seal arranged on the cantilever outer cylinder. A water spraying hole communicating with the rotary water seal is formed in the main shaft assembly. The water injection pipe is communicated with the rotary water seal, and one end of the water injection pipe is exposed outside the cantilever outer cylinder.

[0008] In one embodiment, the main shaft assembly includes a main shaft and an end cover. The end cover is fixedly sleeved outside the main shaft. The cantilever outer cylinder is rotatably sleeved outside the main shaft, and a part of the cantilever outer cylinder is sleeved with the end cover. The first channel is located between the cantilever outer cylinder and the end cover;

[0009] The cutting mechanism further includes a sealing assembly, and the sealing assembly includes a first seal, a second seal, and a third seal. The first seal realizes the seal between the outer wall of the cantilever outer cylinder and the inner wall of the cylindrical part of the cutting head, and the first seal is a one-way seal that allows one-way communication from the second channel to the outside of the cylindrical part. The second seal realizes the seal between the inner side wall of the end cover and the outer side wall of the main shaft. The third seal realizes the seal between the outer side wall of the main shaft and the inner side wall of the cantilever outer cylinder. The second seal and the third seal are respectively arranged near the two ends of the main shaft.

[0010] In one embodiment, a first bearing and a second bearing are further sleeved on the main shaft. The first bearing and the second bearing are arranged at intervals. The cantilever outer cylinder is sleeved outside the first bearing and the second bearing. The first bearing and the second bearing are located between the second seal and the third seal in the axial direction of the main shaft.

[0011] In one embodiment, the cantilever outer cylinder includes a main body portion and an end plate. The end plate is fixedly arranged at one end of the main body portion. The end cover includes a plate body portion and a cylinder body portion. The outer diameter of the cylinder body portion is smaller than the outer diameter of the plate body portion. The end plate is sleeved outside the cylinder body portion, and there is a gap between the inner side wall of the end plate and the outer side wall of the cylinder body portion. There is also a gap between the end face of the end plate and the end face of the plate body portion to form the first channel.

[0012] In one embodiment, one end of the main shaft extends outside the cantilever outer cylinder to be fixedly connected to the head of the cutting head. The cylinder portion of the cutting head extends from one end of the cantilever outer cylinder close to the head to at least the middle of the cantilever outer cylinder.

[0013] The present invention also provides a roadheader, which includes a traveling mechanism, a frame, a shovel plate portion, a conveying mechanism, a slewing platform and a cutting portion. The frame is arranged on the traveling mechanism. The shovel plate portion is arranged at the front end of the frame. The conveying mechanism is used to transport the soil collected by the shovel plate portion to the rear end of the frame. The slewing platform is rotatably arranged on the frame. The cutting portion is pivotally connected to the slewing platform in a pitching manner. The swinging direction of the cutting portion is perpendicular to the rotating direction of the slewing platform. The roadheader further includes a lifting oil cylinder to drive the cutting portion to pitch and swing relative to the slewing platform. The cutting portion includes the above-mentioned cutting mechanism.

[0014] In one embodiment, the cutting portion includes a plurality of the cutting mechanisms. The plurality of cutting mechanisms are arranged in the left-right direction of the roadheader, and the cutting head of the cutting mechanism is a longitudinal axis type cutting head.

[0015] In one embodiment, the cutting portion further includes a driving member, and each cutting mechanism is respectively connected to one driving member.

[0016] In the cutting mechanism and the roadheader of the embodiments of the present invention, by providing an oil injection pipe communicated with the cavity, a first channel and a second channel, the lubricating oil injected into the cavity is extruded to the outside of the cantilever outer cylinder through the first channel and the second channel, so that the lubricating oil is continuously injected into and flows out of the cavity. On the one hand, the flow of the lubricating oil realizes its lubricating function, and on the other hand, it can block the spray water from invading the cavity and prevent components such as bearings from being damaged too quickly, thereby ensuring the long-term normal operation of the cutting mechanism. Description of the Drawings

[0017] Figure 1 It is a sectional view of a cutting mechanism.

[0018] Figure 2 It is a schematic structural diagram of the cutting mechanism according to an embodiment of the present invention.

[0019] Figure 3 It is a schematic structural diagram of the cutting mechanism according to another embodiment of the present invention.

[0020] Figure 4 It is a schematic structural diagram of a roadheader according to an embodiment of the present invention.

[0021] Figure 5 It is Figure 4 a partial schematic diagram of the roadheader shown. Detailed implementation manners

[0022] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and embodiments, details the specific implementation manners, structures, features, and effects of the present invention as follows.

[0023] As Figure 2 shown, the cutting mechanism according to an embodiment of the present invention includes a main shaft 11, a cantilever outer cylinder 13, an end cover 15, and a cutting head 17. The cantilever outer cylinder 13 is rotatably sleeved outside the main shaft 11, and a gap is left between the cantilever outer cylinder 13 and the main shaft 11 to form a cavity 132. The end cover 15 is fixedly sleeved outside the main shaft 11, a part of the cantilever outer cylinder 13 is sleeved with the end cover 15, and a gap is left between the cantilever outer cylinder 13 and the end cover 15 to form a first channel communicating with the cavity 132. The cutting head 17 includes a head 172 and a cylindrical part 174 sleeved outside the cantilever outer cylinder 13. The head 172 is fixedly connected to the main shaft 11, and a gap is left between the cylindrical part 174 and the cantilever outer cylinder 13 to form a second channel communicating with the first channel, and the second channel can communicate with the outside of the cantilever outer cylinder 13. Cutting teeth are provided on the head 172.

[0024] In this embodiment, the cutting mechanism further includes an oil injection device 19, and the oil injection device 19 communicates with the cavity 132 to inject oil into the cavity 132. Specifically, the oil injection device 19 includes an oil injection pipe 192 and an oil pump 194. The oil injection pipe 192 is arranged on the cantilever outer cylinder 13, and one end of it extends into the cantilever outer cylinder 13 to communicate with the cavity 132, and the other end extends out of the cantilever outer cylinder 13 to be connected to an oil delivery pipe connected to the oil pump 194, so as to be connected to the oil pump 194. Preferably, one end of the oil injection pipe 192 is connected to the end of the cavity 132 opposite to the first channel, so that the lubricating oil can flow from the cavity 132 to the other end. What the oil pump 194 injects can be grease or other suitable lubricating oil. The oil pump 194 can continuously inject oil into the cavity 132. Usually, it is more appropriate to inject 0.1 liters of grease per minute, but this is not limited thereto.

[0025] In this embodiment, the cutting mechanism further includes a water spraying device 21. The water spraying device 21 includes a water injection pipe 212 and a rotary water seal 214 provided on the outer cylinder 13 of the cantilever. A water spraying hole 112 communicating with the rotary water seal 214 is formed in the main shaft 11. The water injection pipe 212 is communicated with the rotary water seal 214, and one end of the water injection pipe 212 is exposed outside the outer cylinder 13 of the cantilever so that external water can be injected into the water injection pipe 212. The rotary water seal 214 is sleeved on the main shaft 11 so that the water in the water injection pipe 212 can always enter the water spraying hole 112 in the main shaft 11 through the rotary water seal 214 during the rotation of the main shaft 11. When water is supplied to the water injection pipe 212 from the outside, the water can be sprayed out through the water injection pipe 212, the rotary water seal 214 and the water spraying hole 112, realizing the inner water spraying function of the cutting head.

[0026] In this embodiment, the cutting mechanism further includes a sealing assembly. The sealing assembly includes a first seal 232, a second seal 234 and a third seal 235. The first seal 232 realizes the seal between the outer wall of the outer cylinder 13 of the cantilever and the inner wall of the cylinder part 174 of the cutting head 17, and the first seal 232 is a one-way seal that allows one-way communication from the second channel to the outside of the cylinder part 174. The second seal 234 realizes the seal between the inner side wall of the end cover 15 and the outer side wall of the main shaft 11. The third seal 235 realizes the seal between the outer side wall of the main shaft 11 and the inner side wall of the outer cylinder 13 of the cantilever. The second seal 234 and the third seal 235 are respectively arranged near the two ends of the main shaft 11. Specifically, the first seal 232 can be a one-way skeleton seal, the second seal 234 can be an O-ring, and the third seal 235 can be a floating oil seal. Through the arrangement of the sealing assembly, it is possible to further prevent external water from entering the cavity 132, avoiding damage to components such as bearings, and because it can well ensure the normal operation of the cutting mechanism, and there is no relative rotation between the end cover 15 and the main shaft 11, so the second seal 234 is not easily damaged, and the long-term normal operation of the cutting mechanism can be ensured.

[0027] The second seal 234 and the third seal 235 are respectively located at both ends of the cavity 132 so that the lubricating oil in the cavity 132 does not leak out.

[0028] In this embodiment, the first end of the main shaft 11 extends out of the outer cylinder 13 of the cantilever to be fixedly connected to the cutting head 17. Specifically, a keyway is formed on the first end of the main shaft 11, and the main shaft 11 is fixedly connected to the head 172 of the cutting head 17 through a spline.

[0029] A first bearing 236 and a second bearing 238 are also sleeved on the main shaft 11. The first bearing 236 and the second bearing 238 are arranged at intervals, and the first bearing 236 is located between the first end of the main shaft 11 and the second bearing 238. The cantilever outer cylinder 13 is sleeved outside the first bearing 236 and the second bearing 238. Thus, the cantilever outer cylinder 13 is rotatably supported on the main shaft 11 through the first bearing 236 and the second bearing 238. The first bearing 236 and the second bearing 238 are located between the second seal 234 and the third seal 235 in the axial direction of the main shaft 11. Specifically, the first bearing 236 and the second bearing 238 can be spherical roller bearings.

[0030] In this embodiment, a protrusion 134 near one end of the main shaft 11 is provided on the inner wall of the cantilever outer cylinder 13. The third seal 235 is sleeved between the protrusion 134 and the main shaft 11. The end cover 15 is provided at the other end near the main shaft 11, that is, near the end where the main shaft 11 is connected to the head 172 of the cutting head 17.

[0031] The cantilever outer cylinder 13 includes a main body portion 130 and an end plate 131. The end plate 131 is fixedly provided at one end of the main body portion 130. The end plate 131 is sleeved outside the end cover 15. The first channel is located between the end plate 131 and the end cover 15. It can be understood that the positions of the end plate 131 and the protrusion 134 can be interchanged as long as they enclose a cavity 132 at both ends and facilitate the installation of the first bearing 236 and the second bearing 238.

[0032] Specifically, in this embodiment, the main body portion 130 of the cantilever outer cylinder 13 is an integral structure.

[0033] In this embodiment, the end cover 15 includes a plate body portion 152 and a cylindrical body portion 154. The outer diameter of the cylindrical body portion 154 is smaller than the outer diameter of the plate body portion 152. The end plate 131 is sleeved outside the cylindrical body portion 154, and there is a gap between the inner side wall of the end plate 131 and the outer side wall of the cylindrical body portion 154. There is also a gap between the end face of the end plate 131 and the end face of the plate body portion 152 to form the above-mentioned first channel. It can be understood that the end cover 15 and the main shaft 11 can be separately manufactured and then connected together to form a main shaft assembly, or integrally formed into a main shaft assembly.

[0034] In this embodiment, the cylindrical portion 174 of the cutting head 17 extends from the end near the head 172 of the cantilever outer cylinder 13 to at least the middle of the cantilever outer cylinder 13. The middle of the cantilever outer cylinder 13 can be at a position of 1 / 3 to 2 / 3 of the total length of the cantilever outer cylinder 13, but not limited thereto. The length of the cylindrical portion 174 is preferably such that the end away from the head 172 of the cylindrical portion 174 is not completely immersed in the soil during operation.

[0035] A third bearing 239 is provided at one end of the barrel 174 of the cutting head 17 away from the head 172. The third bearing 239 is sleeved on the cantilever outer barrel 13 and sleeved in the barrel 174. The third seal 235 is provided on the side of the third bearing 239 away from the head 172. Specifically, the third bearing 239 can be a spherical roller bearing.

[0036] The cutting mechanism of this embodiment is provided with an oil filling pipe, a first channel and a second channel connected to the cavity. The lubricating oil injected into the cavity is squeezed out to the outside of the cantilever outer tube through the first channel and the second channel, so that the lubricating oil is continuously injected into and flows out of the cavity. The flow of the lubricating oil can achieve its lubrication effect on the one hand, and on the other hand, it can block the spray water from invading the cavity, prevent the bearing and other components from being damaged too quickly, thereby ensuring the long-term normal operation of the cutting mechanism.

[0037] Please refer to Figure 3 , a cutting mechanism according to another embodiment of the present invention, the cutting mechanism of this embodiment and Figure 2 The structures of the cutting mechanisms shown are basically the same, except that, in this embodiment, the main body 130 of the cantilever outer cylinder 13 is composed of two parts, including a first part 136 and a second part 137 fixedly connected to each other.

[0038] The present invention also provides a tunneling machine, see Figure 4 The tunnel boring machine of one embodiment includes a walking mechanism 31, a frame 33, a shovel section 35, a transportation mechanism 37, a turntable 38 and a cutting section 39. The walking mechanism 31 enables the tunnel boring machine to travel, and can be specifically a crawler mechanism or a tire. The frame 33 is arranged on the walking mechanism 31. The shovel section 35 is arranged at the front end of the frame 33, and is used to collect the soil cut by the cutting section 39. The transportation mechanism 37 is used to transport the soil collected by the shovel section 35 to the rear end of the frame 33 for transportation to the outside. The turntable 38 is rotatably arranged on the frame 33. The cutting section 39 is connected to the turntable 38 so as to be able to pitch and swing, and the swing direction of the cutting section 39 is perpendicular to the rotation direction of the turntable 38. The tunnel boring machine also includes a lifting cylinder 41 to drive the cutting section 39 to pitch and swing relative to the turntable 38. The cutting section 39 includes the above-mentioned cutting mechanism.

[0039] Please refer to Figure 5, in this embodiment, the cutting part 39 includes a plurality of the above-mentioned cutting mechanisms. The plurality of cutting mechanisms are arranged in the left-right direction of the roadheader, and the cutting head 17 of the cutting mechanism is a longitudinal-axis cutting head. In this way, on the one hand, the cutting part 39 can be driven by the lifting cylinder 41 to swing up and down to realize the one-time forming of the roadway section, achieving full-width tunneling, with relatively high working efficiency. And the staff does not need complex actions during cutting, reducing the operation difficulty. On the other hand, the longitudinal-axis cutting head has strong rock-breaking ability and can meet relatively high rock-breaking requirements, thus taking into account both working efficiency and rock-breaking ability. Specifically, in this embodiment, four cutting mechanisms are arranged side by side on the cutting part 39. More specifically, the cutting head 17 of the cutting mechanism is a flat-head cutting head. During the one-time forming of the roadway section, for some places in the corners that cannot be reached, the rotary table 38 can be slightly rotated to cut in place. It can be understood that the number of cutting mechanisms can also be other numbers, such as three, five or more than five.

[0040] In this embodiment, the cutting part 39 further includes a cutting frame body 392, a speed reducer 394 and a driving member 396. The main shaft 11 of the cutting mechanism is connected to the speed reducer 394, and the input shaft of the speed reducer 394 is connected to the output shaft of the driving member 396, and the driving member 396 drives the main shaft 11 to rotate. The shells of the speed reducer 394 and the driving member 396 are installed on the cutting frame body 392, and the cutting frame body 392 is pivotally connected to the rotary table 38. Specifically, in this embodiment, the number of the speed reducer 394 and the driving member 396 corresponds to the number of the cutting mechanisms. Each cutting mechanism is respectively connected to a driving member 396 through a speed reducer 394, that is, each cutting mechanism is independently driven by a driving member 396. In this way, each cutting mechanism can be controlled separately, and it is easy to replace after being damaged, which can reduce the subsequent maintenance difficulty. Specifically, the driving member 396 can be a cutting motor. It can be understood that the speed reducer 394 can be other transmission mechanisms.

[0041] The above are only the preferred embodiments of the present invention, and there is no any form of limitation to the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to be equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A cutting mechanism, characterized in that, It includes a main shaft assembly, a cantilever outer cylinder (13), a cutting head (17), a sealing assembly and an oil injection device (19); the main shaft assembly includes a main shaft (11) and an end cover (15), the end cover (15) is fixedly sleeved outside the main shaft (11), the cantilever outer cylinder (13) is rotatably sleeved outside the main shaft (11), and a gap is left between the cantilever outer cylinder (13) and the main shaft (11) to form a cavity (132); the cantilever outer cylinder (13) includes a main body part (130) and an end plate (131), the end plate (131) is fixedly arranged at one end of the main body part (130), the end cover (15) includes a plate body part (152) and a cylinder body part (154), the outer diameter of the cylinder body part (154) is smaller than the outer diameter of the plate body part (152), and the end plate (131) is sleeved outside the cylinder body part (154); the main body part (130) is sealed with the main shaft (11) at one end of the cavity (132), a gap is left between the inner side wall of the end plate (131) and the outer side wall of the cylinder body part (154), and a gap is also left between the end face of the end plate (131) and the end face of the plate body part (152) to form a first channel communicating with the cavity (132); the cutting head (17) includes a head part (172) and a cylinder part (174) sleeved outside the cantilever outer cylinder (13), the head part (172) is fixedly connected to the main shaft assembly, a gap is left between the cylinder part (174) and the cantilever outer cylinder (13) to form a second channel communicating with the first channel, the second channel can communicate with the outside of the cantilever outer cylinder (13), the sealing assembly includes a first seal (232), the first seal (232) realizes the seal between the outer wall of the cantilever outer cylinder (13) and the inner wall of the cylinder part (174) of the cutting head (17), and the first seal (232) is a one-way seal allowing one-way communication from the second channel to the outside of the cylinder part (174); the oil injection device (19) is communicated with the cavity (132) to inject oil into the cavity (132).

2. The cutting mechanism according to claim 1, characterized in that, The oil injection device (19) includes an oil injection pipe (192) and an oil pump (194), the oil injection pipe (192) is arranged on the cantilever outer cylinder (13), and one end of it extends into the cantilever outer cylinder (13) to communicate with the cavity (132), and the other end extends out of the cantilever outer cylinder (13) to communicate with the oil pump (194); the cutting mechanism further includes a water spraying device (21), the water spraying device (21) includes a water injection pipe (212) and a rotary water seal (214) arranged on the cantilever outer cylinder (13), a water spraying hole (112) communicating with the rotary water seal (214) is opened in the main shaft assembly, the water injection pipe (212) is communicated with the rotary water seal (214), and one end of the water injection pipe (212) is exposed outside the cantilever outer cylinder (13).

3. The cutting mechanism according to claim 1, characterized in that, The sealing assembly further comprises a second sealing member (234) and a third sealing member (235), wherein the second sealing member (234) realizes sealing between the inner wall of the end cover (15) and the outer wall of the main shaft (11), and the third sealing member (235) realizes sealing between the outer wall of the main shaft (11) and the inner wall of the cantilever outer cylinder (13), and the second sealing member (234) and the third sealing member (235) are respectively arranged near the two ends of the main shaft (11).

4. The cutting mechanism according to claim 3, wherein, The main shaft (11) is also provided with a first bearing (236) and a second bearing (238), the first bearing (236) and the second bearing (238) are arranged at an interval, the cantilever outer cylinder (13) is arranged outside the first bearing (236) and the second bearing (238), and the first bearing (236) and the second bearing (238) are located between the second seal (234) and the third seal (235) in the axial direction of the main shaft (11).

5. The cutting mechanism according to claim 1, characterized in that, One end of the main shaft (11) extends out of the cantilever outer tube (13) to be fixedly connected to the head (172) of the cutting head (17), and the tube portion (174) of the cutting head (17) extends from one end of the cantilever outer tube (13) close to the head (172) to at least the middle of the cantilever outer tube (13).

6. A roadheader, characterized in that, The tunnel boring machine comprises a walking mechanism (31), a frame (33), a shovel plate portion (35), a transport mechanism (37), a turntable (38) and a cutting portion (39), wherein the frame (33) is arranged on the walking mechanism (31), the shovel plate portion (35) is arranged at the front end of the frame (33), the transport mechanism (37) is used to transport the soil collected by the shovel plate portion (35) to the rear end of the frame (33), the turntable (38) is rotatably arranged on the frame (33), the cutting portion (39) is connected to the turntable (38) in a pitching and swinging manner, and the swinging direction of the cutting portion (39) is perpendicular to the rotation direction of the turntable (38), and the tunnel boring machine further comprises a lifting cylinder (41) to drive the cutting portion (39) to pitch and swing relative to the turntable (38), and the cutting portion (39) comprises the cutting mechanism according to any one of claims 1 to 5.

7. The roadheader according to claim 6, characterized in that The cutting section (39) comprises a plurality of cutting mechanisms, the plurality of cutting mechanisms are arranged along the left-right direction of the tunnel boring machine, and the cutting heads (17) of the cutting mechanisms are longitudinal axis type cutting heads.

8. The roadheader according to claim 7, characterized in that, The cutting portion (39) further comprises a driving member (396), and each of the cutting mechanisms is respectively connected to one of the driving members (396).

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