• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A cutting pick includes an elongated shank, a cutting tip fixed to one end of the shank which is of a material that is harder than the material of the shank. A multitude of cavities in the form of spiral slots and internal cavities make up part of the shank and contain high thermally conductive material, which has a lower propensity for incendive frictional contact between the shank and rock being excavated. Both the spiral slots and a mechanical spring-loaded rotational device forcibly rotate the pick axially and in predominately the same direction (either clockwise or anti-clockwise) and in a semi-uniform manor as cutting advances. Rotating the pick in this fashion will restrict the propagation of an incendive wear flat on the trailing edge of the shank after the tip has eventually worn away and presents a fresh portion of high thermally conductive material into the frictional hot streak. Figure 1 Figure 2
    公开号:AU2013205232A1
    申请号:U2013205232
    申请日:2013-04-15
    公开日:2013-11-07
    发明作者:Myles Aaron Wylie
    申请人:WYLIE MYLES；
    IPC主号:E21C35-183
    专利说明:
    1 TITLE - FRICTIONAL HEAT SUPPRESSING TIP AND PICK FIELD OF THE INVENTION: [0001] This invention relates to mining picks used for mining and excavation purposes, and particularly but not exclusively to a mining pick that reduces frictional heat and improves the working life of the cutting pick. BACKGROUND OF THE INVENTION: [0002] Industry standard cutting picks are available in a variety of types such as conical, radial and forward attack picks, all being of steel with at least one tip-receiving recess machined into the top, upper face of the shank. Each pick typically has at least one tungsten carbide tip attached within the machined recesses. The present invention is predominately aimed at conical cutting picks with one tungsten carbide tip attached, however non-conical picks could easily be adapted to incorporate the present inventions aspects. [0003] Due to the extremely aggressive engagement between the cutting picks and rock being excavated, the tungsten carbide tips can wear rapidly. Cutting picks may require replacement several times daily when cutting through geologically harsh rock and strata. [0004] When the tungsten carbide tip has broken off or worn away the high tensile steel shank section of the cutting pick is disadvantageously exposed to the rock. The friction between the steel and rock will generate sparks and a wear flat surface will propagate on the trailing edge of the steel shank. Research has indicated that the wear flat surface will deposit a frictional hot streak that contains fragments of hot steel particles, smeared onto the rock surface with sufficient thermal potential to ignite a flammable gas atmosphere. It is unlikely that the 2 tungsten carbide tip alone can generate such an incendive hot streak. [0005] In regards to underground coal mining, one of the greatest hazards is the presence of the flammable gas methane (CH4). When methane is mixed with air and in certain concentrations it can lead to an explosion. The shock wave from this methane explosion can then elevate and suspend coal dust from within the coal tunnel and cause a much larger 'secondary or delayed' dust explosion emanating from the original methane explosion. The present invention is designed to mitigate the risk of methane and coal dust explosions and prolonging the working life of the coal cutting pick. [0006] A common misconception is that frictional sparks are the catalyst for frictional ignition in methane, many research professionals consider the frictional hot streak to be the sole catalyst. Even at methane's optimum explosive level (approximately 7.2% in air), it is considered a difficult gas to ignite by frictional heat in comparison to other flammable gasses such as hydrogen (H). Methane typically displays a lengthy ignition lag time or delay in catching fire when exposed to an explosively hot surface. Methane's ignition lag time is by an order of magnitude greater than the ignition lag time experienced by other flammable gas mixtures. [0007] This invention uses high thermally conductive material imbedded within the picks steel shank to makeup part of the shanks wear flat surface after the tungsten carbide tip has worn away. This high thermally conductive material will wear away at approximately the same rate as the steel shank thus it will be deposited within and adjacent to the hot streak. The high thermally conductive material will initially be deposited at a lower temperature in comparison to the high temperature steel. Heat transfer will instantaneously commence between the high temperature steel and the low temperature high thermally 3 conductive material, thus reducing the overall temperature of the hot streak. [0008] When conical cutting picks are replaced in the cutting drum of a mining machine, the picks are free to rotate axially within the pick holders bore. As the cutting drum advances into the rock being excavated, the engagement forces exerted on the pick will advantageously cause random axial rotation. This rotation of the cutting pick within the pick holder will distribute the impacting force around the circumference of the tungsten carbide tip thus improving tip longevity. When the tip has eventually worn off, the rotating action of the pick will advantageously restrict an incendive wear flat from occurring on the steel shank. [0009] Dust particles of coal and rock typically become jammed in the space between the picks shaft and the pick holders bore causing the pick to disadvantageously cease rotating. An aspect of the present invention is to forcibly rotate the pick within the pick holder in a semi-uniform manor utilising the cutting forces generated from the cutting drum as cutting advances. SUMMARY OF THE INVENTION: [0010] The present invention has a multitude of cavities in the form of spiral slots inserted longitudinally within the steel shank of the cutting pick that contain high thermally conductive material. When the tungsten carbide tip has worn off and the wear flat surface is beginning to propagate on the steel shank, the high thermally conductive material will wear away at the same rate as the shank material thus becoming part of the wear flat surface. A portion of this high thermally conductive material will be deposited directly into the hot streak during frictional rubbing. Heat transfer by thermal conduction between the two dissimilar materials will rapidly dissipate and diminish the thermal intensity of the hot streak and any hot spots within 4 or adjacent to the hot streak. [0011] In an alternative embodiment, the spiral slots could be inserted in a shroud, designed to encapsulate the shank of a standard cutting pick. The shroud material would most likely be similar to the shank material, i.e. typically hardened and tempered high tensile steel. [0012] Since the lag ignition time of the methane air mixture is quite lengthy, the lapsed time between the impacting strike and ignition will allow the temperature level of the hot streak to cool down to a point under methane's ignition temperature thus ignition will be bypassed. [0013] The present invention will also reduce the thermal intensity of any rock pick up that occurs on the shanks wear flat surface. Any rock fragments that frictionally bind onto the shank will either be in direct contact or in close proximity to the high thermally conductive material. Heat transfer will harmlessly conduct heat away from the hot rock fragments into the body of the shank via the high thermally conductive material. [0014] It is envisaged that the high thermally conductive material could be copper (Cu). The thermal properties of copper with high purity are approximately ten times more thermally conductive than high tensile steel. As copper is a ductile malleable metal, fragments will easily dislodge from the shanks cavities during cutting. These dislodged fragments will enter the hot streak at a much lower temperature compared to the steel particles within the hot streak. Heat transfer will instantaneously commence between the hot steel particles and the cold copper particles. [0015] Inserting copper within the shanks machined cavities may disadvantageously degrade the structural integrity of the 5 cutting pick, however additional steel could be used within the shank to compensate for this loss in strength. The underground coal mining industry typically use cutting picks with long narrow shank geometry to mitigate the risk of frictional ignition. Limiting the volume of steel in the shank will inevitably reduce the wear flat surface area. These picks are inappropriately described as 'reduced sparking' picks as sparks have minimal effect in regards to methane ignition. Due to the present inventions unique arrangement between the copper and steel, the pick can accommodate a greater volume of steel in the shank while simultaneously reducing the temperature of the incendive hot streak. Additionally, the present invention could be safely used for cutting coal long after the tungsten carbide tip has worn off because the high thermally conductive material will continue to be deposited into the hot streak as the wear flat propagates. In contrast, the conventional reduced sparking pick must be replaced when its tungsten carbide tip has worn off, as the wear flat will gradually become larger thus more incendive. The present invention will surpass the incendive capabilities of the conventional reduced sparking pick. [0016] It shall be understood from the foregoing description that the high thermally conductive material does not have to be a soft malleable metal like copper but could be any material that possesses high thermally conductive properties. Copper is used as an example because it is inexpensive and readably available. [0017] Synthetic diamond or polycrystalline diamond (PCD) is an example of a material commonly used on cutting tools to improve working life. The properties of PCD are extreme hardness and high thermal conductivity. The PCD protrudes out of holes surrounding the picks shank and is designed to contact the rock prior to the steel incendivily contacting the rock. Alternatively the PCD can be bonded to the outer surface of the shank to form a barrier to protect the steel from contacting the 6 rock. The present invention could incorporate the PCD within the picks shank cavaties, however the PCD would not necessarily need to protrude out of the cavities but instead would be flush with the steel shanks surface. So as previously stated with the copper example, the steel and PCD would wear away at the same rate and fragments of PCD would combine within the hot streak thus reducing the temperature profile by thermal conduction. The PCD would provide the added advantage of enhancing the picks structural integrity but may disadvantageously be cost prohibitive in comparison to other materials such as copper. [0018] In an alternative embodiment, the cavities within the surface of the shank do not need to be spiral slots but could be straight slots or holes or any combination thereof. However, the spiral slots will advantageously offer axial rotational of the pick thus are considered the optimum choice. Additionally, the cavities arrangement could be designed so as to intentionally fail or cave-in on each other via mechanical cutting fatigue. This will advantageously force the high thermally conductive material to be squeezed out from within the cavity and thus into the hot streak. [0019] Other materials could be used within the shanks cavities such as tungsten carbide, vanadium, silicon, boron, zinc, manganese, tin, iron, silver, cubic boron nitride, refractory metal bonded diamond, silicon bonded diamond, layered diamond, infiltrated diamond, thermally stable diamond, natural diamond, vapor deposited diamond, physically deposited diamond, diamond impregnated matrix, diamond impregnated carbide, cemented metal carbide, chromium, titanium, or combinations thereof. [0020] The high thermally conductive material could also be a high viscous gel solution housed internally within the pick and or the picks sleeve. These internal cavities would act as a reservoir for the high thermally conductive gel. The tungsten carbide tip would act as a seal so when it wears away the gel 7 will ooze out of the pick and onto the shanks wear flat surface, ready to be deposited into the hot streak. The viscosity of this gel would be such that the centrifugal force from the mining machines rotating cutter drum would draw the gel out from the reservoir. When the cutter drum is not rotating, the gels viscosity would hold it inside the reservoir thus it would be conserved. [0021] International publication number WO 2012/015348 Al, U.S. Pat. No 7,172,256 and U.S Pat. No 7,963,616 is prior art attempting to use non-incendive materials to act as a barrier between the tungsten carbide tip and steel pick. In the present invention the thermally conductive material is designed to wear away at the same rate as the picks shank material wears away, so there is a clear difference between this prior art and the present invention. However, the metal matrix composite material highlighted in prior art number WO 2012/015348 Al could be used as the thermally conductive material within the present inventions shank cavities. Or, U.S. Pat. No 7,172,256 and U.S Pat. No 7,963,616 - spark supressing sleeve(s) could be used to bind the high thermally conductive material within the shank of the present invention. [0022] A further aspect of the present invention is a method and means to forcibly rotate the pick around its axis during cutting in a semi-uniform manor. This will help to prolong the working life of the cutting pick by; dispersing the impacting forces around the tungsten carbide tip, restricting the wear flat from propagating and presenting a fresh section of high thermally conductive material to the contacting surfaces. [0023] The semi-uniform rotation of the pick within the pick holder is conducted in two individual ways. The first is a method of random rotation predominately in one direction and the second is a method of uniform rotation specifically in one direction.
    8 [0024] The random rotation is generated from the cavities within the picks shank. These cavities can be machined in the form of spiral slots that enable the trailing edge of the cavity to engage with the rock being excavated thus forcibly rotating the pick by a random angular distance but predominately in the same direction (either clockwise or anti-clockwise). [0025] The uniform rotation is generated from a spring-loaded mechanism embedded within the pick holder. This aspect forces the pick to slide into and out of the pick holders bore and in doing so causes interaction between two sets of gear teeth. These gear teeth forcibly rotate the pick axially by an incremental angular distance both on the inward and outward stroke, always in the same direction, with each major impact of the cutting pick. [0026] Sometimes the cutting pick will engage with the rock in a manor that forces the pick to rotate vigorously, perhaps in the opposite direction to which the gear teeth normally travel. This will disadvantageously cause excessive force on the interlocking gear teeth. To overcome this problem a breakaway (slipping) mechanism is also connected to the spring-loaded rotational mechanism. So when the gear teeth experience excessive force the slipping mechanism shall advantageously breakaway permitting the pick to rotate in any direction the force dictates thus preventing mechanical failure of the spring loaded rotational mechanism. [0027] U.S. Pat. No 4,302,053 is prior art attempting to provide uniform pick rotation. This invention uses a spring-loaded mechanism to force the cutting pick to incrementally rotate axially. However, this invention has some significant shortcomings in that it only permits rotation of the cutting pick in one direction. If the engagement forces exerted on the cutting pick attempted to rotate the pick in the opposite direction, then the pawl and ratchet sleeve will experience 9 excessive force resulting in premature mechanical failure. Additionally, this prior art only rotates on the outward stroke. The present invention rotates on the inward and outward stroke thus the high thermally conductive material within the spiral slots will cover a higher contacting surface area during impact. This will advantageously reduce the length of the incendive hot streak. [0028] The high thermally conductive gel housed internally within the shank; and the high thermally conductive material imbedded in the spiral slots; and the semi-uniform axial rotation of the pick are aspects primarily designed to work in unison with the critical aim of reducing the thermal intensity of the picks frictional contact with the rock. On the other hand, if any individual or combination of these aspect(s) were proven to outweigh the other aspect(s) at reducing the risk of frictional ignition, then the definitive embodiment may only incorporate the superior aspect(s). This invention lays claim to any individual or combination thereof. BRIEF DESCRIPTION OF DRAWINGS: [0029] Features and advantages of the present invention will become apparent from the following description of embodiments thereof, by way of example only, with reference to the accompanying drawings, in which: Figure 1 shows a cross section side view of an embodiment of a mining pick in accordance with aspects of the present invention. Figure 2 shows a side view of the mining pick with longitudinal slots machined into the shank. Figure 3 shows an end view of a mining pick with two longitudinal slots machined into the shank.
    10 Figure 4 shows a cross sectional end view of a mining pick with two longitudinal slots machined into the shank. Figure 5 shows a cross sectional side view of a mining pick and wear sleeve with internal cavities. Figure 6 shows a side view of a mining pick with a spring-loaded uniform rotational mechanism when the cutting pick is not in contact with the rock. Figure 7 shows the position where the cutting pick is at relative to the embodiment in figure 6. Figure 8 shows a side view of a mining pick with a uniform rotational mechanism when the cutting pick starts to engage the rock. Figure 9 shows the position where the cutting pick is at relative to the embodiment in figure 8. Figure 10 shows a side view of a mining pick with a uniform rotational mechanism when the cutting pick is fully engaging the rock. Figure 11 shows the position where the cutting pick is at relative to the embodiment in figure 10. Figure 12 shows a side view of a mining pick with a uniform rotational mechanism when the cutting pick is starting to dis engage from the rock. Figure 13 shows the position where the cutting pick is at relative to the embodiment in figure 12. Figure 14 shows the breakaway 'slipping' mechanism that acts as a safety barrier to the spring-loaded uniform rotational device.
    11 DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION: [0030] Figure 1 shows a cross section side view of an embodiment of a mining pick 1. This example represents a conical 'symmetric' type pick that can rotate axially within the sleeve 2. Dust ingress between pick 1 and sleeve 2 typically causes the pick 1 to cease rotating within the sleeve 2. [0031] The sleeve 2 can also axially rotate within the pick holder 3. Pick 1 and sleeve 2 cannot slide apart from each other however as a unit they can slide in and out of the pick holder 3. Dust ingress is prevented from entering the cavity between the sleeve 2 and the pick holder 3 by a sealing ring 4 that contains a dust seal 5. Additional sealing could be incorporated between the sleeve 2 and the pick holder 3, for example bellow seals could be used (not shown). Any sealing arrangement between the sleeve 2 and the pick holder 3 is acceptable. [0032] Positioned at the bottom of the sleeve 2 are strong Belleville springs 6 that compress whenever the pick 1 and sleeve 2 slides inward, i.e. during cutting. The springs will expand when the pick 1 disengages from the rock causing the pick 1 and sleeve 2 to slide outward. [0033] A mechanical uniform rotational device 7 is incorporated within the pick holder 3. This device causes uniform incremental rotation of the pick 1 and sleeve 2 in one direction, i.e. either clockwise or anti-clockwise, when cutting. A breakaway or slipping mechanism 8 acts as a mechanical safety barrier for the uniform rotational device 7, permitting random axial rotation of the pick 1 and sleeve 2 when the cutting engagement forces are extreme. [0034] Figure 2 shows a side view of a conical mining pick example with a series of longitudinal slots 10 incorporated 12 within the shank 12. The pick 9 comprises a tungsten carbide tip 11 and a shaft with a recess 13 to hold the pick 9 within the picks sleeve (not shown). [0035] The longitudinal slots 10 are designed to hold high thermally conductive material within the shank 11 of the pick 9. When the tungsten carbide tip 11 wears away, the trailing edge of the shank 12 will be exposed to the rock being excavated. This will generate a wear flat surface on the trailing edge of the shank 12 and an incendive hot streak will be deposited onto the rocks surface as cutting advances. [0036] The longitudinal slots 10 will become part of a wear flat surface on the shank 12 thus the high thermally conductive material (not shown) will be deposited within the frictional hot streak. The high thermally conductive material will wear away at approximately the same rate as the shank material wears away. [0037] The high thermally conductive material will be frictionally deposited at a lower temperature in comparison to the temperature of the steel fragments in the hot streak, thus heat transfer will commence between the two materials, lowering the overall temperature of the streak. Heat transfer will also occur between any frictional hot rock pick up on the shanks surface 12 and the high thermally conductive material within the slots 10. [0038] The cavities for containing the high thermally conductive material do not necessary have to be longitudinal slots 10 but could be holes and or spirals or any combination thereof, incorporated within the picks shank 12. [0039] The force from the mining machines cutting drum acts in two directions as cutting advances. Typically, a vertical force 14 pushes the cutting drum downward through the rock and an angular force 15 comes from the rotation of the cutter drum.
    13 [0040] The set of longitudinal slots 10 are positioned so as to assist the pick to rotate axially within the pick holder using cutting forces 14 and 15. Figures 3 and 4 will explain this embodiment in more detail. [0041] Figure 3 shows an end view of a mining pick 16 from the perspective looking directly at the shank 19. For simplicity, only two longitudinal slots 17 and 18 are shown on the shank 19 of the pick 16. In reality the pick 16 would typically have a multitude of longitudinal slots as previously represented in Figure 2. [0042] The design of the longitudinal slots 17 and 18 is such that the high thermally conductive material (not shown) will be held within the slot and the cutting forces will rotate the pick 16 axially within the pick holder. In this example, the pick 16 will rotate clockwise when looking from this end view perspective. [0043] Clockwise rotation is achieved by the cutting forces interacting with longitudinal slots 17 and 18. In figure 3 the downward force 20 represents both forces 14 and 15 shown in figure 2. As the pick 16 advances with a downward force 20, protruding sections of rock will catch a section of the trailing edge 21 of the longitudinal slot 17. [0044] The high thermally conductive material will be inserted into a majority of the slots volume, however a small section of the high thermally conductive material will be missing from the slot, along the entire length of trailing edge 21. This missing section enables a fraction of trailing edge 21 to be available for collision with the protruding rock. This trailing edge 21 is at 90degrees to the rock and this will force the pick 16 to rotate clockwise.
    14 [0045] In contrast, the trailing edge 22 of longitudinal slot 18 is at approximately 45degrees. This trailing edge 22 will contain high thermally conductive material flush with the picks shank. Trailing edge 22 may attempt to rotate the pick axially in the anti-clockwise direction, for example if some high thermally conductive material had broken away, however due to the 45degree angle the rock will not be able to bite into the trailing edge 22 and will ricochet off. [0046] Figure 4 is a cross sectional end view of the same pick represented in figure 3. This figure shows trailing edges 21 and 22 in more detail. The hatched areas represent the high thermally conductive material. [0047] In summary, the engagement force between the rock and trailing edge 21 will surpass the engagement force between the rock and trailing edge 22, forcing the pick to rotate clockwise, for a majority of the time. [0048] Figure 5 is a cross sectional side view of a mining pick 23, a tungsten carbide tip 24 and a wear sleeve 25. [0049] In this embodiment the pick 23 has an internal cavity 26 designed to act as a reservoir to hold a volume of high thermally conductive liquid or gel. When the tip 24 wears away, the gel solution will ooze out of orifice 27 and coat the wear flat surface on the picks shank thus reducing the temperature of the incendive hot streak. [0050] In this example only one orifice 27 is shown, however, a multitude of orifices could easily be incorporated between the reservoir 26 and the tip 24. [0051] The viscosity of the high thermally conductive gel solution would be such that it will only ooze out of the orifice 27 by centrifugal force when the cutter drum is rotating. When 15 the cutter drum is stationary, the gels viscosity will hold it inside the reservoir 26, thus conserving the gel. [0052] The picks shaft could be cap sealed at point 28, or the sleeve 25 could act as a secondary reservoir for the gel 29 and sealed at the end 30. [0053] Figure 6 is a side view of a mining pick 31 and a sleeve 32 incorporating a spring-loaded uniform rotational device. This device will axially rotate the pick in the same clockwise direction as the slots described in figure 3. This uniform clockwise rotation from the embodiment in figure 6 is complemented by the clockwise rotation from the embodiment in figure 3, i.e. the spiral slots will work in unison with the spring-loaded device to axially rotate the pick clockwise. [0054] Rigidly fixed to the sleeve 32 are two circular components, 33 and 34, each containing gear teeth, 35 and 36. Note how gear teeth 35 and 36 are a mirror image of each other. [0055] A third circular component 37 is not rigidly fixed to the sleeve 32, but this component 37 is rigidly fixed within the pick holder (not shown). Circular component 37 has gear teeth at each end, 38 and 39 that are designed to mate with gear teeth 35 and 36. Note how gear teeth 38 and 39 are offset i.e. they are not inline with each other. [0056] Positioned at the bottom of the sleeve 33 is a high modulus Belleville spring set 40. These Belleville springs 40 are designed to compress when the pick 31 experiences an impact when cutting and vice-versa expand when the pick 31 is not in contact with the rock. [0057] This design permits items 31, 32, 33 and 34 to slide along the pick axis during cutting, as item 37 is rigidly fixed and cannot slide or rotate. The gear teeth 35, 36, 38 and 39 16 will cause items 31, 32, 33 and 34 to rotate axially during each impact. Figure 6 represents the position that the uniform rotational mechanism would be in if the pick 31 was not engaged with the rock i.e. the Belleville springs fully extended. [0058] Figure 7 represents the position where the cutting pick would be in relation to figure 6. This figure shows the pick fully disengaged with the rock. [0059] Item 41 is the pick, item 42 is the pick holder, item 43 is the cutting drum, item 44 is the virgin rock being excavated, arrow 45 represents the direction of rotation of the cutting drum and arrow 63 shows the direction the drum is travelling. [0060] Figure 8 shows the spring-loaded uniform rotational device moving axially as engagement between the pick and rock commences. Arrow 46 represents the direction the pick is moving and point 47 represents the mating gear teeth engaging as the Belleville springs 48 partially compress. [0061] Figure 9 represents the position where the cutting pick would be in relation to figure 8. This figure shows the pick just starting to engage the rock. [0062] Figure 10 shows the spring-loaded uniform rotational device moving axially and rotating axially. Arrow 49 shows the direction the pick is moving and the gear teeth have now rotated the pick axially. Point 51 represents the mating gear teeth fully engaged and the Belleville spring 52 have now fully compressed. [0063] Figure 11 represents the position where the cutting pick would be in relation to figure 10. This figure shows the pick fully engaging the rock.
    17 [0064] Figure 12 shows the spring-loaded uniform rotational device moving axially as engagement between the pick and rock starts to disengage. Arrow 53 represents the direction the pick is moving and point 54 represents the mating gear teeth engaging as the Belleville springs 55 partially expands. [0065] Figure 13 represents the position where the cutting pick would be in relation to figure 12. This figure shows the pick starting to disengage with the rock. [0066] Figure 6 through to figure 13 represents one revolution of the cutting drum and one incremental rotational cycle of the uniform rotational device. [0067] Figure 14 shows a side view of the sleeve 56 attached to a breakaway 'slipping' mechanism 57 that acts as a mechanical safety barrier to the uniform rotational device. [0068] This slipping mechanism 57 is a common mechanical component and is based on the design of an agricultural PTO shaft slip clutch. This mechanism simply permits random axial rotation of the sleeve 56 when the engagement forces are extreme. The slipping device 57 is fixed and unable to rotate within the pick housing (not shown). [0069] The central section of the uniform rotational device 58 is rigidly connected to ring 59. Circular clamping plates 60 and 61 use the helical springs 62 to apply clamping force to ring 59. [0070] Alternatively the slipping device could be a simple shear bolt or a shear key connected between the sleeve 56 and uniform rotational device 58, however, it is envisaged that the slipping device 57 would be the most efficient method of achieving random axial rotation on demand.
    18 [0071] Those skilled in the art will appreciate that the invention described in the description is susceptible to variations and modifications other than those specifically described. All such variations and modifications are to be considered within the scope and spirit of the present invention the nature of which is to be determined from the foregoing description.
    权利要求:
    Claims (19)
    [1] 1. A mining pick, comprising: a elongated shank; a cutting element mounted to the shank; a pick holder; a sleeve between the pick and pick holder; at least one retaining plate to seal and hold the pick and sleeve within the pick holder; at least part of the shank being formed of material(s) with high thermally conductive properties; at least part of the shank formed of high thermally conductive material(s) configured for presentation onto contacting surface(s) during cutting; at least one spring-loaded uniform rotational mechanism;
    [2] 2. A mining pick defined by claim 1 wherein at least part of the shank that is formed from high thermally conductive material and is configured in such a way to be directly deposited between the rock and shanks contacting surface(s) during cutting.
    [3] 3. A mining pick defined by either one of claims 1 and 2 wherein cavities encircle the shanks surface which are designed to hold the thermally conductive material and are in the form spiral slots to facilitate frictionally depositing the high thermally conductive material onto the contacting surface(s) and thus both the shank material and the thermally conductive material wears away at the same rate.
    [4] 4. A mining pick defined by any one of the previous claims wherein the high thermally conductive material has fewer propensities to cause ignition of a flammable substance adjacent to the pick during cutting compared to the shank material. 2
    [5] 5. A mining pick defined by any one of the previous claims wherein at least part of the body formed of the high thermally conductive material is configured to be deposited within and or adjacent to the hot smear generated by frictional rubbing after the cutting element fails.
    [6] 6. A mining pick defined by any one of the previous claims wherein frictional fragments of the high thermally conductive material deposited within the hot streak would initially be at a lower temperature in comparison to the high temperature frictional fragments of the shank material, thus heat transfer will instantaneously commence between the two dissimilar materials thus reducing the temperature within and adjacent to the frictional hot streak.
    [7] 7. A mining pick defined by any one of the previous claims wherein heat transfer occurs between the high thermally conductive material within the shank and any hot frictional rock pick-up on the shanks surface resulting from frictional rubbing during the excavating process.
    [8] 8. A mining pick defined by any one of the previous claims wherein the high thermally conductive material having an equal or lesser hardness than that of the cutting element and or shank material.
    [9] 9. A mining pick defined by any one of the previous claims wherein the high thermally conductive material is copper.
    [10] 10. A mining pick defined by claims 1 to 7 of the previous claims wherein the high thermally conductive material having equal or greater hardness than that of the cutting element and shank material. 3
    [11] 11. A mining pick defined by claims 1 to 7 and 10 of the previous claims wherein the high thermally conductive material is poly-crystalline diamond.
    [12] 12. A mining pick defined by claims 1 to 7 of the previous claims wherein the high thermally conductive material is a viscous gel solution.
    [13] 13. A mining pick defined by claims 1 to 7 and claim 12 wherein a cavity or cavities imbedded inside the pick act as a reservoir for the gel solution to be released after the cutting element fails.
    [14] 14. A mining pick defined by claims 1 to 7 and claims 12 and 13 wherein the viscosity of the high thermally conductive gel will permit the gel to ooze out of the picks reservoir by the centrifugal force exerted from the mining machines rotating cutter drum and will remain stationary within the picks reservoir when the cutter drum is not rotating thus conserving the gel when the mining machine is not in use.
    [15] 15. A mining pick defined by claims 1 to 12 wherein the shanks cavities are designed to fail via mechanical cutting fatigue thus forcibly squeezing the high thermally conductive material out of the adjacent cavity and thus into the frictional hot streak.
    [16] 16. A mining pick defined by claims 1 to 12 and 15 wherein the cavities on the surface of the shank are of a spiral slot pattern that facilitates axial rotation of the cutting pick predominately in one direction (either clockwise or anti-clockwise) within the cutting pick holder by the engagement between the rock and the trailing edge of the spiral slot. 4
    [17] 17. A mining pick defined by any one of the previous claims that has the ability to slide down within the pick holders bore by the impacting force of the pick engaging the rock and forcibly slide up the pick holders bore when disengaging the rock by Belleville springs located within the pick holder.
    [18] 18. A mining pick defined by any one of the previous claims wherein a uniform rotational device contains two sets of gear teeth aligned to permit incremental rotation of the pick on the downward stroke and incremental rotation of the pick on the upward stroke but always in the same direction (either clockwise or anti-clockwise), preferentially in the same direction as claim 16.
    [19] 19. A mining pick defined by any one of the previous claims that incorporate a breakaway or slipping mechanism permitting the pick to rotate in any direction in the event whereby the forces acting on the pick vigorously drive it in that particular direction, thus the pick can rotate when the engagement forces are excessive hence protecting the gear teeth from damage.
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    AU2013201977A1|2013-11-28|Radial tool with conical cutting insert
    同族专利:
    公开号 | 公开日
    AU2013205232B2|2015-11-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3833264A|1970-09-02|1974-09-03|G Elders|Self-sharpening bit and mounting therefor|
    US4302053A|1980-02-23|1981-11-24|The United States Of America As Represented By The Secretary Of The Interior|Mounting block to rotate coal cutter bits|
    DE3341322C2|1983-11-15|1986-04-10|Ruhrkohle Ag, 4300 Essen|Holder for picks|
    AU2004201284B2|2004-03-26|2008-12-18|Sandvik Intellectual Property Ab|Rotary cutting bit|
    CN201057047Y|2007-07-09|2008-05-07|姚勋|Hard alloy coal cutting tooth for mining|
    AU2010206065B1|2010-07-30|2011-10-27|Sandvik Intellectual Property Ab|Metal matrix pick|
    法律状态:
    2016-03-24| FGA| Letters patent sealed or granted (standard patent)|
    2017-11-23| PC| Assignment registered|Owner name: INNOVATIVE ENGINEERING PRODUCTS PTY LTD Free format text: FORMER OWNER(S): WYLIE, MYLES |
    优先权:
    申请号 | 申请日 | 专利标题
    AU2012901594A|AU2012901594A0||2012-04-23|Frictional Heat Suppressing Tip and Pick|
    AU2012901594||2012-04-23||
    AU2013901049||2013-03-27||
    AU2013901049A|AU2013901049A0||2013-03-27|Frictional Heat Suppressing Tip and Pick|
    AU2013205232A|AU2013205232B2|2012-04-23|2013-04-15|Frictional Heat Suppressing Tip and Pick|AU2013205232A| AU2013205232B2|2012-04-23|2013-04-15|Frictional Heat Suppressing Tip and Pick|
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