CN111706326A

CN111706326A - Drill bit assembly

Info

Publication number: CN111706326A
Application number: CN202010597926.9A
Authority: CN
Inventors: R·W·阿诺德; M·L·奥尼尔
Original assignee: Joy Global Underground Mining LLC
Current assignee: Joy Global Underground Mining LLC
Priority date: 2015-01-28
Filing date: 2015-01-28
Publication date: 2020-09-25
Anticipated expiration: 2035-01-28
Also published as: AU2021204803A1; CN107407146A; AU2023203206A1; ZA201704938B; WO2016122502A1; AU2015380665A1; GB2550096A; GB201713521D0; AU2021204803B2; CN107407146B; CN111706326B; AU2015380665B2

Abstract

A drill bit assembly for a mining machine, the drill bit assembly comprising: a block defining a first end surface and a second end surface opposite the first end surface, the block including a first bore defining a first opening in the first end surface and a second opening in the second end surface, and a fluid passage including a first portion and a second portion extending at least partially around a perimeter of the first bore and proximate the second opening; a bit sleeve comprising a shank, a flange, and a second bore extending through the shank and flange, the shank being seated within the first bore of the block such that a surface of the flange engages the first surface of the block; a seal disposed within the first aperture such that the seal defines an inner wall of the second portion of the fluid passage.

Description

Drill bit assembly

The present application is a divisional application of the chinese patent application with application number 201580077290.2 entitled "drill bit assembly" filed on 28/1/2015.

Technical Field

The invention relates to a mining machine. In particular, the present invention relates to a drill bit assembly for a mining machine.

Background

Conventional continuous mining machines and entry excavators include a cutter head body that includes a plurality of drill bit assemblies. In some embodiments, each bit assembly includes a bit holder block connected to the rotating drum. A water nozzle is disposed within the bit block, and the bit block includes a passage for providing water to the nozzle. The bit block further includes a slot for receiving the sleeve. The sleeve includes an outer surface and a bore, the outer surface engaging the groove of the bit block. The drill bit is secured within the bore of the sleeve.

Disclosure of Invention

In one aspect, a drill bit assembly for a mining machine includes a block, a drill bit sleeve, and a seal. The block defines a first end surface and a second end surface opposite the first end surface. The block includes a first bore and a fluid passage. The first bore extends through the first end surface and at least partially through the block toward the second end surface. The fluid passage includes a first portion and a second portion in fluid communication with the first portion. The first portion is oriented obliquely with respect to the first bore, and the second portion extends at least partially around a perimeter of the first bore. The bit sleeve includes a shank, a flange, and a second bore extending through the shank and the flange. The shank is positioned within the first bore of the block such that a surface of the flange engages a first end surface of the block. The seal is disposed between the second portion of the fluid passage and the shank to prevent fluid in the fluid passage from contacting an outer surface of the shank.

In another aspect, a drill bit assembly for a mining machine includes a block, a drill bit sleeve, and a seal. The block defines a first end surface and a second end surface opposite the first end surface, the block including a first bore and a fluid passage. The first aperture defines a first opening in the first end surface and a second opening in the second end surface. The fluid passage includes a first portion and a second portion extending at least partially around a perimeter of the first bore and proximate the second opening. The bit sleeve includes a shank, a flange, and a second bore extending through the shank and the flange. The shank is positioned within the first bore of the block such that a surface of the flange engages a first end surface of the block. The seal is positioned in the first perforation such that the seal defines an inner wall of the second portion of the fluid passage.

In another aspect, a cutter head for a mining machine includes a drum rotatable about a drum axis and including an outer surface, and a plurality of bit assemblies connected to the outer surface of the drum. Each bit assembly includes a block, a bit sleeve, a bit, and a seal. The block defines a first end surface and a second end surface opposite the first end surface, and the block includes a first bore and a fluid passage. The first bore extends through the first end surface and at least partially through the block toward the second end surface. The fluid passage includes a first portion and a second portion in fluid communication with the first portion. The first portion is oriented obliquely with respect to the first aperture and the second portion extends at least partially around a perimeter of the first aperture. The bit sleeve includes a first shank, a flange, and a second bore extending through the first shank and the flange. The first shank is positioned within the first bore of the block such that a surface of the flange engages a first end surface of the block. The drill bit includes a second shank, a shoulder, and a tip. The second shank is seated within the second bore of the sleeve such that the shoulder abuts the flange of the sleeve. The seal is disposed between the second portion of the fluid passage and the first shank to prevent fluid in the fluid passage from contacting an outer surface of the first shank.

In another aspect, a drill bit assembly for a mining machine includes a block, a drill bit sleeve, a drill bit, and a seal assembly. The block defines a first end surface and a second end surface opposite the first end surface. The block includes a first bore and a fluid passage. The first bore extends through the first end surface and at least partially through the block toward the second end surface. The fluid passage includes a first portion and a second portion in fluid communication with the first portion. The first portion is oriented obliquely with respect to the first aperture and the second portion extends at least partially around a perimeter of the first aperture. The second portion defines a first edge surface and a second edge surface. The bit sleeve includes a first shank, a flange, and a second bore extending through the first shank and the flange. The first shank is positioned within the first bore of the block such that a surface of the flange engages a first end surface of the block. The drill bit includes a second shank, a shoulder, and a tip. The second shank is positioned within the second bore of the sleeve such that the shoulder abuts the flange of the sleeve. The seal assembly is secured to the first shank and includes a first O-ring seal and a second O-ring seal. The first O-ring seal extends around the first shank at a location proximate the first edge surface. The second O-ring seal extends around the first shank at a location proximate the second edge surface. Each O-ring seal is removable with the first shank when the first shank is removed from the first bore.

Other aspects of the invention will become apparent by reference to the detailed description and the accompanying drawings.

Drawings

FIG. 1 is a perspective view of a mining machine.

Fig. 2 is a perspective view of a portion of a cutter head.

Figure 3 is a perspective view of the drill bit assembly.

FIG. 4 is a side cross-sectional view of the drill bit assembly of FIG. 3, with the drill bit and fluid nozzles of the drill bit assembly removed, as viewed along a section extending parallel to the axis of the bore in the block.

FIG. 5 is a perspective cross-sectional view of the drill bit assembly shown in FIG. 3 with the drill bit and fluid nozzles of the drill bit assembly removed.

FIG. 6 is a side cross-sectional view of a drill bit assembly having a seal according to another embodiment.

FIG. 7 is a side cross-sectional view of a drill bit assembly according to another embodiment with a drill bit and fluid nozzles of the drill bit assembly removed.

FIG. 8 is an exploded top view of a drill bit assembly according to another embodiment with the drill bit and fluid nozzles of the drill bit assembly removed.

FIG. 9 is an exploded side cross-sectional view of the drill bit assembly of FIG. 8, as viewed along section 9-9, with the drill bit and fluid nozzles of the drill bit assembly removed.

Fig. 10 is a perspective view of a clamping block according to another embodiment.

Fig. 11 is a perspective view of a clamping block according to another embodiment.

Detailed Description

Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," or "having" and variations thereof is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. The terms "mounted," "connected," and "coupled" are used broadly and encompass both direct and indirect mounting, connecting, and coupling. Further, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings, and may include direct or indirect, electrical or hydraulic connections or couplings. Further, electronic communication and notification may be performed using any known means, including direct connection, wireless connection, and the like.

Fig. 1 illustrates a mining machine, such as a continuous mining machine 10, including a frame 14, the frame 14 being supported for movement by tracks 18. The continuous miner 10 also includes a boom 22 and a cutter head 26 supported on the boom 22. In the illustrated embodiment, the frame 14 also includes a collection head 30 and a conveyor 34, the conveyor 34 extending from a first or front end of the frame 14 to a second or rear end of the frame 14. The collection head 30 includes a pair of rotating arms 38 that engage the cut material below the cutter head 26 and direct the cut material onto the conveyor 34. The conveyor 34 transports cut material along the longitudinal axis of the housing 14 from an area below the cutter head 26 to a second conveyor (not shown) located near a second end of the housing 14.

The cantilever 22 includes: pivotally coupled to one end of the frame 14 and supporting the other end of the cutter head 26. The boom 22 may pivot about a pivot axis 54, the pivot axis 54 being generally transverse to the longitudinal axis of the frame 14. Boom 22 is pivoted by a pair of actuators 58, with actuators 58 coupled between frame 14 and boom 22. In the illustrated embodiment, the actuator 58 is a hydraulic jack or cylinder

As shown in fig. 2, the cutter head 26 is formed as an elongated drum 62, the drum 62 including a drill bit assembly 66 secured to an outer surface of the drum 62. In the illustrated embodiment, the outer surface of the roller 62 includes a plurality of tooth holders 68, and each bit assembly 66 is secured to one of the tooth holders 68. The roller 62 defines a roller axis 70 (fig. 1) that is generally parallel to the pivot axis 54 of the cantilever arm 22, and the roller 62 is rotatable about the roller axis 70.

As shown in fig. 3, each bit assembly 66 includes a bit 74, a sleeve 78, and a gripping block 82. The drill bit 74 includes a first portion 86 and a second portion or shank 90, the first portion 86 having a tip 88 for engaging a mine face to remove material. The first portion 86 defines a shoulder 94.

As shown in fig. 4, the sleeve 78 defines a first end 98 and a second end 102, and the sleeve 78 includes a first portion 106, a flange 110, and a bore 114, the bore 114 extending through the first portion 106 and the flange 110. The flange 110 is positioned adjacent the first end 98 of the sleeve 78 and defines an abutment surface 118. The shank 90 of the bit 74 is positioned within the bore 114 and the shoulder 94 abuts the first end 98 of the sleeve 78. In one embodiment, the tang 90 is received in the aperture 114 with a clearance fit and retained by a clip (not shown). In other embodiments, the shank 90 may be press fit within the bore 114. A seal 126 is secured to the outer surface of the first portion 106. In the illustrated embodiment, a portion of the first portion 106 is tapered.

As shown in fig. 4 and 5, the clamp block 82 defines a first or front end surface 134, a second or rear end surface 138, a third or lower surface 142, and a fourth or upper surface 146. Lower surface 142 is secured to one of the tooth mounts 68 (fig. 2). The clamping block 82 includes a first aperture or slot 150 extending through the first end surface 134. In the illustrated embodiment, the slot 150 has a circular profile. The clamp block 82 also includes an aperture 154 for supporting a fluid nozzle 158 (fig. 6), and the aperture 154 is disposed between the upper surface 146 and the slot 150. The nozzle 158 provides a spray pack 160 (fig. 3), the spray pack 160 surrounding the upper surface of the drill bit 74 proximate the tip 88. In the illustrated embodiment, the spray pack 160 has a conical shape.

The clamping block 82 includes a first channel 162 for providing fluid to the nozzle 158. The first channel 162 includes a first portion extending from the lower surface 142 to the aperture 154 and a second portion or annular portion 166, the second portion or annular portion 166 extending around the perimeter of the groove 150. The first portion intersects the annular portion 166. In the illustrated embodiment, the first portion extends in a straight line through the slot 150 and is perpendicular to the axis of the slot 150. In other embodiments, the first portion may form a different angle relative to the axis of the slot 150, or the first portion may be oriented to be skewed relative to the axis of the slot 150. Further, the first portion may be oriented in a plane perpendicular to the axis of the slot 150 such that the first portion forms an angle with respect to the side surface of the clamp block 82. As used herein, the term "tilt" refers to the situation where two directions or structures are oriented at any angle that is not parallel with respect to each other. Such situations include situations where the two structures are perpendicular to each other, skewed with respect to each other (i.e., do not intersect), or where the two structures form an acute angle with respect to each other.

In the illustrated embodiment, the clamp block 82 further includes a lateral opening 170 and a second opening 174, the lateral opening 170 extending between the sides of the clamp block 82 such that the slot 150 extends between the first end surface 134 and the lateral opening 170, the second opening 174 extending between the rear end surface 138 and the lateral opening 170. The illustrated clamp block 82 also includes a second aperture 182 for supporting a second fluid nozzle 186 (fig. 6), and the second aperture 182 is positioned between the slot 150 and the lower surface 142. The second nozzle 186 provides a spray pack 188 (fig. 3) that surrounds the lower surface of the drill bit 74 proximate the tip 88. In the illustrated embodiment, the spray pack 188 has a conical shape. The clamp block 82 includes a second channel 190 extending from the lower surface 142 to the second aperture 182.

In the illustrated embodiment, the first portion 106 of the sleeve 78 is seated within the slot 150 and the abutment surface 118 engages the first end surface 134 of the clamp block 82. In one embodiment, the sleeve 78 is press fit within the slot 150 and the sleeve 78 is further secured relative to the gripping block 82 by a clip 194, the clip 194 extending around a portion of the sleeve 78 in the lateral opening 170. The seal 126 is positioned adjacent the annular portion 166 of the first channel 162. The sleeve 78 is retained within the groove 150, thereby applying pressure to the seal 126 against the annular portion 166. The seal 126 is wider than the annular portion 166 such that the seal 126 engages (i.e., seals) both edges of the annular portion 166 and prevents fluid from contacting the outer surface of the sleeve 78 or flowing out of the first channel 162. In addition, when the sleeve 78 is removed from the slot 150, the annular portion 166 is exposed and any debris in the first channel 162 may be cleaned. The wide contact surface between the seal 126 and the clamp block 82 limits crevice corrosion and increases the operating life of the seal 126. In the illustrated embodiment, the seal 126 is located on a tapered portion of the sleeve 78. In one embodiment, the mating surfaces of the seal 126 and the clamp block 82 form a groove profile to provide a high focal point to form a reliable seal and crevice corrosion barrier.

FIG. 6 illustrates another embodiment of a drill bit assembly 566 in which the seal 526 is formed as a pair of O-

rings

526a, 526b disposed on each side of the annular portion 166. The first portion 106 of the sleeve 78 includes a groove 508, the groove 508 for receiving the O-

ring seals

526a, 526b and retaining the seals within the groove 150. In this embodiment, the fluid in the annular portion 166 contacts the shank 90, but is sealed from outflow between the groove 150 and the sleeve 78.

Fig. 7 illustrates another embodiment of the clamping block 782 and the sleeve 778, in which the seal is a bushing 726, and the bushing 726 is press fit within the groove 750 of the clamping block 782, so that the bushing 726 remains in place in the groove 750 even when the sleeve 778 is removed from the groove 750. The bushing 726 may be removed to clear the first passage 762. When the sleeve 778 is inserted into the slot 750, the sleeve 778 provides pressure on the bushing 726.

Fig. 8 and 9 illustrate another embodiment of a clamp block 982 and a sleeve 978, wherein a portion of the first portion 906 of the sleeve is coated with a high temperature cured sealant material 926. Specifically, protrusions (relief)908 (fig. 9) are formed on the outer surface of the first portion 906 of the sleeve 978, and a sealant 926 is electrostatically applied to the protrusions 908, which is then heated to form a pliable skin. Such electrostatic application processes are known to those of ordinary skill in the art and are therefore not described in further detail herein. Groove 950 includes engagement surfaces 952 (fig. 9) on each side of annular portion 966 such that when sleeve 978 is press-fit into groove 950, surfaces 952 contact sealant 926.

Fig. 10 illustrates another embodiment of the clamp block 1182 and sleeve 1178, wherein the first channel 1162 includes an annular portion 1166, the annular portion 1166 extending around the perimeter of the second opening 1174, rather than around the perimeter of the slot 1150. Additionally, the connector 1126 is inserted into the second opening 1174 to seal the annular portion 1166. In one embodiment, the connector 1126 is a nut or other threaded connector. In another embodiment (fig. 11), connector 1326 is a bushing or ring press-fit into second opening 1174.

Although the drill bit assembly is described above with respect to a continuous miner, it should be understood that the drill bit assembly may be incorporated into various types of cutter heads and various types of miners.

Accordingly, the present invention discloses, among other things, a drill bit assembly for a mining machine. Although the invention has been described in detail with reference to certain preferred embodiments, variations and modifications exist within the scope and spirit of one or more of the independent aspects of the invention described.

Claims

1. A drill bit assembly for a mining machine, the drill bit assembly comprising:

a block defining a first end surface and a second end surface opposite the first end surface, the block including a first bore defining a first opening in the first end surface and a second opening in the second end surface, and a fluid passage including a first portion and a second portion extending at least partially around a perimeter of the first bore and positioned proximate the second opening, the block further including a first side surface, a second side surface, and a lateral opening extending between the first and second side surfaces, a forward portion of the first bore extending between the first end surface and the lateral opening, a rearward portion of the first bore extending between the second end surface and the lateral opening;

a bit sleeve comprising a shank, a flange, and a second bore extending through the shank and flange, the shank being seated within the first bore of the block such that the shank extends through the first opening and a surface of the flange engages the first surface of the block;

a seal disposed within a rear portion of the first bore such that the seal defines an inner wall of the second portion of the fluid passage, the seal being offset from the shank.

2. The cutting bit assembly of claim 1, wherein the shank is spaced from the second portion of the fluid passage such that the second portion does not extend around the first shank.

3. The bit assembly of claim 1, wherein the shank is a sleeve shank and the bit assembly further comprises a bit comprising a bit shank, a shoulder, and a tip, the bit shank being disposed within the second bore of the sleeve such that the shoulder abuts the flange of the sleeve.

4. The cutting bit assembly of claim 1, wherein the seal is secured within the block, the seal being retained within the first bore when the first shank is removed from the first bore.

5. The drill bit assembly of claim 1, wherein the lateral opening is disposed between the shank and the second portion of the fluid passage.

6. The cutting bit assembly of claim 1, wherein the block defines a lower surface and an upper surface, wherein the lower surface is configured to be connected to a cutting drum, the block further comprising a first aperture supporting a first fluid nozzle disposed between the first bore and the upper surface, wherein a first portion of the fluid channel extends from the lower surface to the first aperture and intersects the second portion, the fluid channel providing fluid communication with the first fluid nozzle.

7. A drill bit assembly for a mining machine, the drill bit assembly comprising:

a block defining a first end surface and a second end surface opposite the first end surface, the block including a first bore extending through the first end surface and at least partially through the block toward the second end surface, and a fluid passage including a first portion oriented obliquely relative to the first bore and a second portion in fluid communication with the first portion, the second portion extending at least partially around a perimeter of the first bore;

a bit sleeve comprising a first shank, a flange, and a second bore extending through the first shank and flange, the first shank being disposed within the first bore of the block such that a surface of the flange engages a first end surface of the block,

a drill bit comprising a second shank, a shoulder, and a tip, the second shank being disposed within the second bore of the sleeve such that the shoulder abuts the flange of the sleeve, an

A seal formed as a coating on a portion of the shank, the seal positioned between the second portion of the fluid passage and the shank to prevent contact between fluid in the fluid passage and an outer surface of the shank.

8. The cutting bit assembly of claim 7, wherein the block defines a lower surface and an upper surface, wherein the lower surface is configured to be connected to a cutting drum, the block further comprising a first aperture supporting a first fluid nozzle disposed between the first bore and the upper surface, wherein a first portion of the fluid channel extends from the lower surface to the first aperture and intersects the second portion, the fluid channel providing fluid communication with the first fluid nozzle.