Rock cutting apparatus

Abstract

A rock excavating device comprising: a shaft comprising a first portion and a second portion connected to an end of the first portion, the first portion being supported for rotation about a first axis, the second portion extending along a second axis that is inclined relative to the first axis; a cutting element supported on the second portion of the shaft and rotatable about the second axis, the cutting element comprising a cutting edge, the cutting edge comprising a leading portion and a trailing portion and being rotatable in a plane perpendicular to the second axis, the leading portion being configured to engage a rock face, the trailing portion being configured to be spaced apart from the rock face, rotation of the first portion of the shaft about the first axis varying an orientation of the second axis and an orientation of the leading portion; and an eccentric mass arranged proximate to the first portion of the shaft, the eccentric mass being driven for rotation about an actuator axis, rotation of the eccentric mass causing oscillation of the shaft and the cutting element.

Description

[0001] This application is a divisional application of Chinese invention patent application filed on September 22, 2017, entitled "Rock Cutting Device" and with application number 201780069536.0.

[0002] Cross-reference to related applications

[0003] This application claims priority to the previously filed, co-pending U.S. Provisional Applications 62 / 398,744, 62 / 398,717, and 62 / 398,834, all filed September 23, 2016. The entire contents of these documents are incorporated herein by reference. Technical Field

[0004] This disclosure relates to mining and excavation machinery, and more specifically, to cutting devices used in mining or excavation machinery. Background Technology

[0005] Hard rock mining and excavation typically require applying significant energy to a portion of the rock surface to cause it to fracture. One conventional technique involves operating a cutting head with multiple cutting teeth. Due to the rock's hardness, the teeth must be replaced frequently, resulting in substantial downtime for machinery and mining operations. Another technique involves drilling multiple holes in the rock face, inserting a blasting device into the holes, and detonating the blast. The explosive force fractures the rock, the rock residue is then removed, and the rock face is ready for another drilling operation. This technique is time-consuming and exposes operators to a significant risk of injury due to the use of explosives and the weakening of the surrounding rock structure. Yet another technique utilizes a roller cutting element that rolls or rotates about an axis parallel to the rock face, thereby applying significant force to the rock to induce fracture. Summary of the Invention

[0006] On one hand, a rock-digging device includes a shaft and a cutting element. The shaft includes a first portion and a second portion connected to an end of the first portion. The first portion is rotatable about a first axis. The second portion extends along a second axis inclined relative to the first axis. The cutting element includes a cutting edge. The cutting element is supported on the second portion and is rotatable about the second axis. Rotation of the first portion of the shaft about the first axis changes the orientation of the second axis and the cutting element.

[0007] On the other hand, a cutting assembly for a rock excavation device includes a cantilever and a cutting device supported on the cantilever. The cutting device includes a shaft and a cutting edge. The shaft includes a first portion and a second portion. The first portion is rotatable about a first axis. The cutting edge is supported on the second portion and is rotatable about a second axis oriented at an angle relative to the first axis. The shaft is supported to rotate about the first axis, thereby changing the orientation of the second portion and the second axis relative to the cantilever.

[0008] In another aspect, a rock-digging device includes a shaft and a cutting element. The shaft includes a first portion and a second portion. The first portion is supported to rotate freely about a first axis, and rotation of the first portion changes the orientation of the second portion. The cutting element includes a cutting edge. The cutting element is supported on the second portion and is capable of rotating about a second axis that is tilted relative to the first axis.

[0009] Other aspects will become apparent by considering the detailed description and accompanying figures. Attached Figure Description

[0010] Figure 1 It is a perspective view of the mining machinery.

[0011] Figure 2 This is a side view of the cutting head.

[0012] Figure 3 It is along Figure 1 The section shown in section 3-3 is observed. Figure 2 A cross-sectional view of the cutting head.

[0013] Figure 4 yes Figure 2 An exploded view of the cutting head.

[0014] Figure 5 yes Figure 4 An exploded view of a portion of the cutting head.

[0015] Figure 6 yes Figure 2 An exploded view of a portion of the cutting head.

[0016] Figure 7 yes Figure 6 An exploded view of a portion of the cutting head.

[0017] Figure 8 It is in contact with the rock wall. Figure 2 A schematic diagram of the cutting head.

[0018] Figure 9 This is a perspective view of the cutting head according to another embodiment.

[0019] Figure 10 It is observed along section 10-10. Figure 9 A cross-sectional view of the cutting head.

[0020] Figure 11 yes Figure 9 The cutting head and the side cross-sectional view of the cantilever according to one embodiment.

[0021] Figure 12 This is a perspective view of the cutting head according to another embodiment.

[0022] Figure 13 It is observed along section 13-13. Figure 12 A side cross-sectional view of the cutting head.

[0023] Figure 14 This is a perspective view of the cutting head according to another embodiment.

[0024] Figure 15 It is observed along section 15-15. Figure 12 A side cross-sectional view of the cutting head.

[0025] Figure 16 It is observed along section 15-15. Figure 12 A side cross-sectional view of the cutting head. Detailed Implementation

[0026] Before explaining any embodiments in detail, it should be understood that the application of the present invention is not limited to the construction details and component arrangements set forth in the following description or shown in the following drawings. This disclosure can have other embodiments and can be practiced or performed in various ways. Moreover, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising,” “including,” or “having,” and variations thereof throughout this document is intended to cover the items listed thereafter and their equivalents, as well as additional items. The terms “mounted,” “connected,” and “coupled” are used broadly and include both direct and indirect mounting, connection, and coupling. Furthermore, “connected” and “coupled” are not limited to physical or mechanical connections or couplings, but may also include electrical or fluid connections or couplings, whether direct or indirect. Furthermore, electronic communication and notification can be performed using any known means, including direct connections, wireless connections, etc.

[0027] Furthermore, it should be noted that embodiments of the present invention may include hardware, software, and electronic components or modules, and for the purposes of discussion, the foregoing has been shown or described as if most components were implemented solely in hardware. However, those skilled in the art, based on reading this detailed description, will recognize that in at least one embodiment, aspects of the present invention can be implemented using software (e.g., stored on a non-transient computer-readable medium) executable by one or more processing units (e.g., microprocessors, application-specific integrated circuits (“ASICs”), or other electronic devices). Therefore, it should be pointed out that the present invention can be implemented using multiple hardware- and software-based devices and multiple different structural components. For example, the “controller” described in the specification may include one or more electronic processors or processing units, one or more computer-readable medium modules, one or more input / output interfaces, and various connections (e.g., system buses) of the connecting components.

[0028] Figure 1 A rock excavation or mining machine 10 (e.g., an inlet excavator) is shown, which includes a chassis 14, a cantilever 18, and a mechanism for engaging a rock face 30. Figure 8 The system includes a rock excavation device or cutting device or cutting head 22 and a material handling system 34. In the illustrated embodiment, the chassis 14 is supported on a traction drive (e.g., track mechanism 38) for movement relative to the ground (not shown). In the illustrated embodiment, the track 38 includes roller tracks 42. The chassis 14 includes a first end or front end and a second end or rear end, and a longitudinal chassis axis 50 extends between the front end and the rear end.

[0029] In the illustrated embodiment, the cantilever 18 is supported on a turntable, rotary table, or rotary joint 54 for pivoting relative to the chassis 14. Rotary joint 54 ( Figure 3 The rotary joint 54 and cantilever 18 are supported to rotate about a rotation axis 58 perpendicular to the chassis axis 50 (e.g., the rotation axis 58 is perpendicular to the support surface) (e.g., by a rotary bearing, not shown) so that the cantilever 18 pivots in a plane generally parallel to the chassis axis 50 (e.g., a plane parallel to the support surface). In the illustrated embodiment, a rotary actuator or cylinder 66 extends and retracts to pivot the rotary joint 54 and cantilever 18 about the rotation axis 58. In some embodiments, the rotary joint 54, cantilever 18, cutting head 22, and material handling system 34 are supported on a common feed frame movable relative to the chassis 14. Movement of the feed frame allows the cutting head 22 and material handling system 34 to move parallel to the chassis axis 50 and advance toward the rock surface 30 while the chassis 14 remains fixed in place relative to the ground.

[0030] Material handling system 34 includes a bucket or collection head 42 and a conveyor 44. Collection head 42 includes a baffle or deck 46 and a rotating arm 48. As the mining operation advances, the cut material is pushed onto the deck 46, and the rotating arm 48 moves the cut material onto the conveyor 44 for conveying the material to the rear end of the machine 10. In other embodiments, the arm may slide or sweep across a portion of the deck 46 (instead of rotating) to guide the cut material to the conveyor 44. Conveyor 44 may be a chain conveyor driven by one or more sprockets. In the illustrated embodiment, conveyor 44 is connected to collection head 42 and is supported to move relative to chassis 14 together with collection head 42.

[0031] like Figure 1 As shown, the cantilever 18 includes a first portion or base 70, a second portion or wrist 74 supporting the cutting head 22, and an intermediate portion 78 located between the base 70 and the wrist 74. In the illustrated embodiment, the base 70 is pivotally connected to a rotary joint 54 (e.g., via a pin joint), and the base 70 is pivotally rotated or “lamped” relative to the rotary joint 54 by a first actuator 80 (e.g., a hydraulic cylinder). Extension and retraction of the first actuator 80 causes the base 70 to pivot about a lamping axis or a first pivot axis 82. The first pivot axis 82 may be transverse to the rotation axis 54, such that extension and retraction of the first actuator 80 causes the base 70 to move between an upper position and a lower position. Additionally, the intermediate portion 78 is pivotally connected to the base 70 (e.g., via a pin joint), and the intermediate portion 78 is pivotally connected to the base 70 by a second actuator 84 (e.g., a second hydraulic cylinder). The extension and retraction of the second actuator 84 causes the intermediate portion 78 to pivot about a second pivot axis 86 offset from the first pivot axis 82. In the illustrated embodiment for the cantilever unit oriented as shown, the second pivot axis 86 is substantially perpendicular to either the luffing axis or the first pivot axis 82. In other embodiments (not shown), the base of the cantilever may alternatively be connected to the frame and supported for pivoting about a lateral axis or a luffing axis, and a rotary joint may be formed on a portion of the cantilever. It should be noted that other embodiments may include various configurations for the articulated portion of the cantilever.

[0032] In addition, the wrist 74 includes a lug 90 ( Figure 2 Lug 90 is pivotally connected to intermediate portion 78 (e.g., via a pin joint). Wrist 74 is pivoted relative to intermediate portion 78 by wrist actuator 92 (e.g., a hydraulic cylinder). Extension and retraction of wrist actuator 92 cause wrist 74 to pivot about wrist axis 94 offset from first pivot axis 82 and second pivot axis 86. In the illustrated embodiment, second pivot axis 86 is substantially perpendicular to first pivot axis 82 and substantially perpendicular to wrist axis 94.

[0033] like Figure 2 As shown, the cutting head 22 includes a housing 98 supported at one end of the wrist 74, and is connected to the middle portion 78 ( Figure 1 The two arms are spaced apart. In the illustrated embodiment, the housing 98 is formed as a separate structure that is detachably connected to the wrist 74 (e.g., by fasteners). The cutting head 22 is located near the distal end of the cantilever 18. Figure 1 ).like Figure 2 and 3 As shown, the cutting head 22 includes a cutting member or drill bit or cutting disc 102 having a peripheral edge 106, and a plurality of cutting drill bits 110 are positioned along the peripheral edge 106. The peripheral edge 106 may have a circular (e.g., circular) profile, wherein the cutting drill bits 110 are oriented in a common plane or cutting plane 114.

[0034] Now for reference Figure 3 The cutting disc 102 is rigidly connected to a bracket 122 supported on a shaft 126. The shaft 126 includes a first portion 138 and a second portion 140. The first portion 138 is supported by one or more bearings 134 (e.g., tapered roller bearings) for rotation relative to the housing 98, and rotates about a first axis 142. The second portion 140 of the shaft 126 extends along a second axis 144 that is inclined to or not parallel to the first axis 142. In the illustrated embodiment, the second axis 144 forms an acute angle 146 relative to the first axis 142.

[0035] In some embodiments, angle 146 is greater than about 0 degrees and less than about 25 degrees. In some embodiments, angle 146 is between about 1 degree and about 15 degrees. In some embodiments, angle 146 is between about 1 degree and about 10 degrees. In some embodiments, angle 146 is between about 1 degree and about 7 degrees. In some embodiments, angle 146 is about 3 degrees.

[0036] The second portion 140 supports the bracket 122 and the cutting disk 102 for rotation about a second axis 144. Specifically, the bracket 122 is supported by a bracket bearing 148 (e.g., a tapered roller bearing) for rotation relative to the axis 126. In the illustrated embodiment, the second axis 144 represents the cutting axis around which the cutting disk 102 rotates, and the second axis 144 is perpendicular to the cutting plane 114. Furthermore, in the illustrated embodiment, the second axis 144 intersects the first axis 142 at the center of the front surface of the cutting disk 102, or at the center of the cutting plane 114 defined by the cutting drill bit 110.

[0037] An excitation element 150 is positioned within a housing 98 near a first portion 138 of shaft 126. The excitation element 150 includes an actuator shaft 154 and an eccentric mass 158 disposed on the actuator shaft 154. The actuator shaft 154 and the eccentric mass 158 may be supported within an actuator housing 162. The actuator shaft 154 is supported by actuator bearings 166 (e.g., roller bearings, such as spherical roller bearings, compact aligned roller bearings, and / or toroidal roller bearings) to rotate relative to the actuator housing 162. The actuator shaft 154 is connected to an actuator motor 170 and is driven to rotate about an actuator axis 174. The eccentric mass 158 is offset from the actuator axis 174. In the illustrated embodiment, the actuator shaft 174 is aligned with a first axis 142. In other embodiments, the actuator axis 174 may be oriented parallel to and offset from the first axis 142. In other embodiments, the actuator axis 174 may be tilted relative to the first axis 142, or oriented at a tilt angle. The actuator axis 174 may also be positioned offset and tilted relative to the first axis 142.

[0038] In the illustrated embodiment, the actuator motor 170 is supported on the wrist 74, and the actuator shaft 154 is connected to the output shaft of the actuator motor 170 via a connector 178 extending between one end of the actuator shaft 154 and the actuator motor 170. Furthermore, in the illustrated embodiment, the actuator housing 162 includes multiple portions (162a, 162b, 162c) that are fixed to each other and to the shaft 126. That is, the actuator housing 162 rotates with the shaft 126 and is supported to rotate relative to the housing 98. In other embodiments, the actuator housing 162 may be integrally formed with the shaft 126.

[0039] Rotation of the eccentric mass 158 about the actuator axis 174 causes eccentric oscillations of the housing 98, shaft 126, bracket 122, and cutting disk 102. In some embodiments, the actuator element 150 and cutting head 22 are similar to the actuator components and cutting drill bit described in U.S. Publication No. 2014 / 0077578, published March 20, 2014, the entire contents of which are incorporated herein by reference. In the illustrated embodiment, the bracket 122 and cutting disk 102 are freely rotatable relative to the shaft 126; that is, the cutting disk 102 is neither prevented from rotating nor actively driven to rotate, except by the induced vibrations caused by the actuator element 150 and / or the reaction force exerted on the cutting disk 102 by the rock surface 30. In embodiments where the actuator axis 174 is offset and / or tilted relative to the first axis 142, rotation of the eccentric mass 158 will cause radial (perpendicular to the first axis 142) and axial (parallel to the first axis 142) excitations or oscillations.

[0040] refer to Figure 6 and 7 One end of the actuator housing 162 is fixed to a gear surface 190 (e.g., a spur gear, a toothed belt, etc.). Additionally, the cutting head 22 includes a second motor 194 supported adjacent to the end of the actuator housing 162. The second motor 194 includes an output shaft (not shown) connected to a pinion 198, which meshes with or engages with the gear surface 190. Operation of the second motor 194 drives the pinion 198, thereby rotating the gear surface 190. The rotation of the gear surface 190 causes the actuator housing 162 and shaft 126 to rotate about a first axis 142. As a result, a second portion 140 of shaft 126 also rotates, thereby changing the orientation of the second axis 144 (about which the cutting disc 102 rotates). For example, Figure 3 The cutting disc 102 is oriented to cut downwards; the shaft 126 can be rotated 180 degrees to adjust the cutter gap to change the cutting direction (e.g., upwards).

[0041] In the illustrated embodiment, the second axis 144 intersects the first axis 142 at the center of the front surface of the cutting disk 102 (i.e., the center of the cutting plane 114 defined by the peripheral edge 106 in the illustrated embodiment) or very close to the center of the plane 114. As a result, when the axis 126 rotates, the center of the cutting disk 102 remains in a fixed (or nearly fixed) relative position, thereby preventing translation of the cutting disk 102 during axis 126 rotation. In other embodiments, a small offset may exist between axes 142 and 144.

[0042] Furthermore, in the illustrated embodiment, the cutting head 22 includes a rotary joint or hydraulic rotary head 206 for providing fluid communication between the fluid source and components within the cutting head 22. The rotary head 206 can deliver various types of fluids, including lubricants, hydraulic fluids, water, or other media for rinsing the rock being cut and / or cooling the cutting disc 102. In some embodiments, the rotary head 206 is located between the actuator motor 170 and the actuator shaft 154, and a connector 178 extends through the rotary head 206. In other embodiments, the components may be positioned in different ways.

[0043] Figure 8 A schematic diagram shows the cutting head 22 engaging the rock surface 30 in an undercut manner. The cutting disc 102 extends across the length of the rock surface 30 along the cutting direction 214. The front portion 218 of the cutting disc 102 contacts the rock surface 30 at the contact point. The cutting plane 114, oriented perpendicular to the second axis 144, forms an approximately acute angle 222 with respect to the tangent of the rock surface 30, such that the rear portion 226 of the cutting disc 102 (i.e., a portion of the disc positioned behind the front portion 218 relative to the cutting direction 214) is spaced apart from the rock surface 30. Angle 222 provides a gap between the rock surface 30 and the rear portion 226.

[0044] By rotating the axis 126, the operator can modify the orientation of the second axis 144 and thus change the orientation of the cutting disk 102. A plane containing the first axis 142 and the second axis 144 (e.g., Figure 3 The plane of the cross-section also includes the width or diameter 202 of the outer edge 106. Diameter 202 extends between the point on the cutting disc 102 closest to the surface 30 relative to the first axis 142 (i.e., the front portion 218) and the point on the cutting disc 102 furthest from the surface 30 relative to the first axis 142 (i.e., the tail portion 226). To cut in the desired direction, the operator rotates the axis 126 such that the plane containing the first axis 142 and the second axis 144 is aligned with the desired cutting direction.

[0045] The cutting head 22 is omnidirectional, capable of effectively cutting in any direction and changing the cutting direction. The controller can coordinate the translation of the cutting disc 102 on the face 30 and the rotation of the second part 140 of the axis 126 during changes in cutting direction to prevent axial interference between the cutting disc 102 and the face 30. Furthermore, the cantilever 18 with multiple pivot axes is compact and versatile, simplifying the suspension and control of the wrist 74 and reducing the frequency at which the position and orientation of the cutting head 22 must be reconfigured.

[0046] Although the intersection of the first axis 142 and the second axis 144 has been described above as being located at the center of the cutting plane 114, it is also possible that the intersection of axes 142 and 144 may be offset by a small distance from the cutting plane 114. In this case, the center of the cutting plane 114 will move with the rotation of axis 126, resulting in a small translation of the cutting disk 102. The cutting disk 102 can still cut rock under such conditions, and the cutting characteristics can be changed depending on the offset distance between the intersection and the cutting plane 114 and the characteristics of the rock to be cut (e.g., the specific energy or energy required to excavate a unit volume of rock).

[0047] Figure 9 and 10 The cutting head 22, separate from the cantilever, is shown. (See figure) Figure 10 As shown, the actuator housing 562 may have the same characteristics as the one referenced above. Figure 3 The actuator housing 162 is described in different shapes and structures. Additionally, Figure 11 A cutting head 422, connected to a wrist 474, is shown according to another embodiment. The wrist 474 does not include a lug, but instead includes a shaft 490 supported for pivoting relative to a fixed portion 492. The connector 574 is different from the one described above. Figure 3 The connector 174 is described as being long enough to accommodate additional distances between the actuator motor 170 and the actuator shaft 154.

[0048] Figure 12 and13 A cutting head 822 according to yet another embodiment is shown. Many aspects of the cutting head 822 are similar to those of the cutting head 22, and similar features are identified by similar reference numerals plus 800. The cutting head 822 includes an actuator motor 970, which is supported on the housing 898 rather than on a portion of the cantilever. Additionally, a second motor 994 is located outside the housing 898, rather than near one end of the housing 898.

[0049] Figure 14 and 15 A cutting head 1222 according to yet another embodiment is shown. Many aspects of the cutting head 1222 are similar to those of the cutting head 22, and similar features are identified by similar reference numerals plus 1200.

[0050] like Figure 15 As shown, the cutting head 1222 includes a single motor 1370 for driving the actuator shaft 1354 to rotate the eccentric mass block 1358 about the actuator axis 1374. The cutting head 1222 also includes a shaft 1326 supporting the cutting disc 1302. Specifically, the shaft 1326 includes a first portion 1338 and a second portion 1340. The first portion 1338 is supported to rotate relative to the housing 1298 (e.g., via a bearing 1334). The first portion 1338 extends along a first axis 1342, and the second portion 1340 extends along a second axis 1344 that is inclined or non-parallel to the first axis 1342. In the illustrated embodiment, the second axis 1344 forms an acute angle 1346 relative to the first axis 1342. The cutting disc 1302 is connected to a bracket 1322 supported and rotating on the second portion 1340. In the illustrated embodiment, the bracket 1322 is not directly driven to rotate but is supported to rotate freely relative to the second portion 1340 (e.g., via a bearing 1348).

[0051] In the illustrated embodiment, housing 1298 may be connected to actuator housing 1362 (e.g., via adapter plate 1364), but the first portion 1338 of shaft 1326 (e.g., the first end or proximal end of shaft 1326) is not directly fixed to rotate with actuator housing 1362. Shaft 1326 is not directly driven to rotate but is supported to rotate freely relative to housing 1298 and relative to actuator housing 1362. In the illustrated embodiment, shaft 1326 rotates about an axis concentric with actuator axis 1374 (e.g., first axis 1342). In other embodiments, the axis of rotation of shaft 1326 may be offset and / or tilted relative to actuator axis 1374. Furthermore, in the illustrated embodiment, the combined center of gravity of the second portion 1340 of shaft 1326 and the components supported thereon (e.g., cutting disc 1302, bracket 1322, bearing 1348, etc.) is located on an axis concentric with first axis 1342.

[0052] The cutting head 1222 does not include a second motor for driving the rotation of the shaft 1326. A portion of the shaft 1326 supporting the cutting disc 1302 (i.e., the second portion 1340) is inclined or not parallel to the first portion 1338. Figure 16 As shown, because the cutting disc 1302 can rotate freely about the second axis 1344, the radial component of the cutting reaction force F acts on the second portion 1340 at the point where the second axis 1344 intersects the cutting plane 1314 of the disc 1302. Consequently, any radial load applied to the cutting disc 1302, such as the reaction force caused by the cutting disc 1302 impacting the rock strata, will generate a torque on the shaft 1326, causing the shaft 1326 to rotate about the first axis 1342, thus orienting the second portion 1340 away from the applied force. The magnitude of the torque is equal to the radial component of the cutting force F multiplied by the distance D between the line of action of the cutting force F (i.e., the intersection of the second axis 1344 and the cutting plane 1314) and the intersection of the first axis 1342 and the cutting plane 1314. The product of the radial component and the distance D produces a steering torque T. Therefore, even if the direction of travel of the cutting head 1222 changes, the front portion 1418 of the cutting disc 1302 (i.e., the portion of the disc 1302 that protrudes furthest in the direction parallel to the first axis 1342) can automatically orient itself to engage the rock. It should be noted that the radial component of the reaction force may never be precisely aligned with the direction of travel, but they are generally aligned. The bearing 1334 may also generate some friction to resist minor changes in the direction of travel. The bearing 1334 also applies reaction forces R1 and R2 on the shaft 1326 in response to the cutting force F.

[0053] Refer again Figure 15 The cutting head 1222 also includes one or more nozzles 1404, a hydraulic rotary head 1406, and a fluid passage 1408 extending through the shaft 1326. In the illustrated embodiment, the hydraulic rotary head 1406 receives jet fluid, such as water, from a fluid source (e.g., a pump – not shown). The fluid passage 1408 provides fluid communication between the rotary head 1406 and the nozzles 1404 located on the shaft 1326 adjacent to the cutting disc 1302. Pressurized fluid is ejected from the nozzles 1404. In the illustrated embodiment, the nozzles 1404 are fixed to one end of the shaft 1326 and oriented toward the front portion 1418 of the disc 1302. As the shaft 1326 rotates, the nozzles 1404 maintain their orientation to eject fluid toward the direction of impact.

[0054] The cutting head 1222 eliminates the need for a second electric motor and accompanying hydraulic components, and also includes simple mechanical parts to achieve the "steering" function. Additionally, a smaller diameter cutting disc 1302 can be used, and the cantilever supporting the cutting head 1222 ( Figure 1The control of it is not too complicated.

[0055] Although cutting devices have been described above for mining machinery (e.g., entrance development machines), it should be understood that one or more separate aspects of the cutting device and / or other components may be incorporated into another type of machine or may be supported on the cantilever of another type of machine. Examples of other types of machines may include (but are not limited to) drilling rigs, tunnel boring machines, borehole machines, continuous mining machines, longwall mining machines, and excavators.

[0056] Although various aspects have been described in detail with reference to certain embodiments, variations and modifications may exist within the scope and spirit of one or more independent aspects described. Various features and advantages are set forth in the following claims.

Claims

1. A rock excavation device, characterized in that, The rock excavation device includes: A shaft includes a first portion and a second portion connected to an end of the first portion, the first portion being supported to rotate about a first axis, and the second portion extending along a second axis inclined relative to the first axis. A cutting element supported on a second portion of a shaft and rotatable about a second axis, the cutting element including a cutting edge comprising a front portion and a tail portion, and rotatable in a plane perpendicular to the second axis, the front portion being configured to engage a rock surface, and the tail portion being configured to be spaced apart from the rock surface, rotation of the first portion of the shaft about the first axis altering the orientation of the second axis and the orientation of the front portion; and An eccentric mass block is arranged near the first portion of the shaft, the eccentric mass block is driven to rotate about the actuator axis, and the rotation of the eccentric mass block causes the shaft and the cutting element to oscillate. The reaction force generated on the cut edge upon impact with the rock surface will produce a torque, which will excite the first part of the shaft to rotate around the first axis, thereby reorienting the front part of the cut edge to engage the rock surface. The rotation of the eccentric mass block is independent of the rotation of the first part of the shaft.

2. The rock excavation device according to claim 1, characterized in that, The rock excavation device also includes an electric motor for driving the first part to rotate around the first axis.

3. The rock excavation device according to claim 1, characterized in that, The cutting element is a cutting disc, the cutting edge has a circular shape, and the first axis and the second axis intersect each other at the center of a plane formed by a plurality of cutting drill bits.

4. The rock excavation device according to claim 1, characterized in that, The rock excavation device also includes: A first electric motor for driving the rotation of the eccentric mass block, and A second electric motor is used to drive the first part to rotate around the first axis.

5. The rock excavation device according to claim 1, characterized in that, The first axis and the second axis are in a common plane, which is aligned with the cutting direction of the cutting element.

6. The rock excavation device according to claim 5, characterized in that, The tail portion is spaced apart from the front portion, and the common plane extends between the front portion and the tail portion.

7. The rock excavation device according to claim 1, characterized in that, The second portion of the shaft includes an end adjacent to the cutting edge and spaced apart from the first axis, and the rock excavation device further includes at least one fluid nozzle fixed to the end of the second portion and oriented toward the first axis.

8. The rock excavation device according to claim 1, characterized in that, The combined center of gravity of the second part and all the components supported thereon is concentric with the first axis.

9. The rock excavation device according to claim 1, characterized in that, The cutting element is supported to rotate freely relative to the second part.

10. A cutting assembly for rock excavation machinery, characterized in that, The cutting assembly includes: Cantilever; and A cutting device supported on the cantilever, the cutting device comprising: A shaft includes a first portion and a second portion connected to an end of the first portion, the first portion being supported to rotate about a first axis, and the second portion extending along a second axis inclined relative to the first axis. A cutting element supported on a second portion of a shaft and rotatable about a second axis, the cutting element including a cutting edge comprising a front portion, a tail portion, and a plurality of cutting bits, the cutting edge being rotatable in a plane of rotation perpendicular to the second axis, the front portion being configured to engage a rock surface, the tail portion being configured to be spaced apart from the rock surface, and rotation of a first portion of the shaft about the first axis altering the orientation of the second axis and the orientation of the front portion; and An eccentric mass block is arranged near the first portion of the shaft, the eccentric mass block is driven to rotate about the actuator axis, and the rotation of the eccentric mass block causes the shaft and the cutting element to oscillate. The first axis and the second axis intersect each other at the center of the plane of rotation.

11. The cutting assembly according to claim 10, characterized in that, The first axis and the second axis are in a common plane, which is aligned with the cutting direction of the cutting device.

12. The cutting assembly according to claim 11, characterized in that, The tail portion is separated from the front portion, and the common plane extends between the front portion and the tail portion.

13. The cutting assembly according to claim 10, characterized in that, The cutting assembly also includes a suspension device for elastically supporting the cutting device to oscillate relative to the cantilever.

14. The cutting assembly according to claim 13, characterized in that, The suspension device includes at least one hydraulic cylinder for biasing the cutting device in a predetermined direction relative to the cantilever.

15. The cutting assembly according to claim 10, characterized in that, The cutting assembly also includes an electric motor for driving the first portion to rotate about the first axis.

16. The cutting assembly according to claim 10, characterized in that, The cutting element is a cutting disc, and the cutting edge has a circular shape.

17. The cutting assembly according to claim 10, characterized in that, The cutting assembly also includes: A first electric motor for driving the rotation of the eccentric mass block, and A second electric motor is used to drive the first part to rotate around the first axis.

18. The cutting assembly according to claim 10, characterized in that, The cutting element is supported to rotate freely relative to the second part.

19. The cutting assembly according to claim 10, characterized in that, The rotation of the eccentric mass block is independent of the rotation of the first part of the shaft.

20. The cutting assembly according to claim 10, characterized in that, in, The reaction force generated on the cut edge upon impact with the rock surface produces a torque that excites a first portion of the shaft to rotate about the first axis, thereby reorienting the front portion of the cut edge to engage the rock surface.

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