Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
DRILL MOTOR ASSEMBLY
Document Type and Number:
WIPO Patent Application WO/2017/083940
Kind Code:
A1
Abstract:
A drill motor assembly including a drill shaft and at least two sub-motor assemblies operatively engaged with the drill shaft to cause the drill shaft to rotate.

More Like This:
Inventors:
FLYNN, Daniel Marcus (c/- Level 27, 10 Eagle StreetBrisbane, Queensland 4000, 4000, AU)
THEODORIDIS, Con (c/- Level 27, 10 Eagle StreetBrisbane, Queensland 4000, 4000, AU)
Application Number:
AU2016/051135
Publication Date:
May 26, 2017
Filing Date:
November 21, 2016
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
PPK (IP) PTY LTD (Level 31, Australia Square264-278 George Stree, Sydney New South Wales 2000, 2000, AU)
International Classes:
E21B6/00; E21B1/00; E21B3/00; E21B3/02; E21B7/00; E21B7/02; E21B11/00; E21B12/00
Foreign References:
US3766995A1973-10-23
DE19615307A11997-10-23
US5029655A1991-07-09
US2516182A1950-07-25
Attorney, Agent or Firm:
FISHER ADAMS KELLY CALLINANS (Level 6, 175 Eagle StreetBrisbane, Queensland 4000, 4000, AU)
Download PDF:
Claims:
CLAIMS

1 . A drill motor assembly comprising: a drill shaft; and at least two sub-motor assemblies operatively engaged with the drill shaft to cause the drill shaft to rotate.

2. The drill motor assembly of claim 1 , the drill motor assembly further comprising a controller.

3. The drill motor assembly of claim 2, wherein the controller controls the at least two sub-motor assemblies to control output speed and torque of the assembly.

4. The drill motor assembly of claim 2 or claim 3, wherein the controller is configured to switch the at least two sub-motor assemblies between a series configuration and a parallel configuration.

5. The drill motor assembly of any one of claims 1 -4, wherein the at least two sub-motor assemblies are internally switched by at least one of a valve, a cartridge and a switching element controlled by the controller.

6. The drill motor assembly of any one of claims 1 -4, wherein the at least two sub-motor assemblies are externally switched by at least one of a valve, a cartridge and a switching element controlled by the controller.

7. The drill motor assembly of any one of claims 1 -6, wherein the drill shaft is driven by a spur gear.

8. The drill motor assembly of any one of claims 1 -7, wherein the at least two sub-motor assemblies are gear motors.

9. The drill motor assembly of claim 8, wherein each of the gear motors engages the gear of the drill shaft to drive the drill shaft.

10. The drill motor assembly of any one of claims 1 -7, wherein the at least two sub-motor assemblies are gear motors.

1 1 . The drill motor assembly of any one of claims 1 -10, wherein the drill motor assembly comprises four sub-motor assemblies engaging the drill shaft.

12. The drill motor assembly of claim 1 1 , wherein two of the four sub- motor assemblies are configured in series and two of the four sub-motor assemblies are configured in parallel.

13. The drill motor assembly of claim 1 1 , wherein the four sub-motor assemblies are configured in series.

14. The drill motor assembly of claim 1 1 , wherein the four sub-motor assemblies are configured in parallel.

15. The drill motor assembly of any one of claims 1 -14, wherein the at least two sub-motor assemblies are fixed displacement motors or variable displacement motors.

16. The drill motor assembly of any one of claims 1 -14, wherein the at least two sub-motor assemblies are fixed displacement motors and/or variable displacement motors.

17. The drill motor assembly of any one of claims 1 -16, wherein the at least two sub-motor assemblies are evenly spaced radially around the drill shaft.

18. The drill motor assembly of any one of claims 1 -17, wherein the drill shaft is hollow.

19. The drill motor assembly of any one of claims 1 -18, wherein, the drill shaft is configured to receive a drill bit.

20. The drill motor assembly of any one of claims 1 -19, wherein the drill motor assembly is mounted in a housing.

21 . The drill motor assembly of any one of claims 1 -20, wherein an output shaft of the drill shaft extends from an end of the housing.

22. A method of operating a drill motor assembly comprising the steps of: operatively engaging the drill shaft with at least two sub-motor assemblies; and energising the at least two sub-motor assemblies to cause the drill shaft to rotate.

23. The method of claim 22, the method further comprising the step of varying the output speed and torque of the drill shaft.

24. The method of claim 22 or claim 23, wherein the step of varying the output speed and torque of the drill shaft comprises switching a circuit configuration of the at least two sub-motor assemblies between a series configuration and a parallel configuration.

25. The method of any one of claims 22-24, wherein the step of engaging the drill shaft with at least two sub-motor assemblies comprises engaging the drill shaft with four sub-motor assemblies.

26. The method of any one of claims 22-25, wherein the step of energising the at least two sub-motor assemblies to cause the drill shaft to rotate comprises energising the four sub-motor assemblies to cause the drill shaft to rotate.

27. The method of any one of claims 22-26, the method further comprising the step of receiving a drill bit in the drill shaft.

28. The method of any one of claims 22-27, the method further comprising the step of switching the circuit configuration of the four sub-motor assemblies via the controller such that two of the sub-motor assemblies are in series and two of the sub-motor assemblies are in parallel.

29. The method of any one of claims 22-27, the method further comprising the step of switching the circuit configuration of the four sub-motor assemblies via the controller such that at least two of the sub-motor assemblies are in series.

30. The method of any one of claims 22-27, the method further comprising the step of switching the circuit configuration of the four sub-motor assemblies via the controller such that at least two of the sub-motor assemblies are in parallel.

Description:
DRILL MOTOR ASSEMBLY

FIELD OF THE INVENTION

[0001 ] The invention relates to a drill motor. In particular, the invention relates, but is not limited, to a drill motor assembly using two or more sub- motors.

BACKGROUND TO THE INVENTION

[0002] Reference to background art herein is not to be construed as an admission that such art constitutes common general knowledge in Australia or elsewhere.

[0003] The use of inline drive motors and offset drive motors in mining operations, such as for the installation of strata fixing components in underground mining operations, are well known.

[0004] Drilling and bolting operations typically benefit from multiple drilling speeds and torques to suit the different specific requirements of drilling and bolting operations. Some existing implementations achieve this by running the drill at sub-optimal drilling conditions.

[0005] Other solutions include using drill heads with a variable displacement piston motor that can achieve speed and torque variations. However, such variable displacement motors are often very bulky and expensive. [0006] Thus, it is desirable to be able to modify the drive speed of the drill rather than operate at sub-optimal drilling conditions, while also reducing the size and cost of the assembly.

OBJECT OF THE INVENTION

[0007] It is an aim of this invention to provide a drill motor assembly which overcomes or ameliorates one or more of the disadvantages or problems described above, or which at least provides a useful alternative.

[0008] Other preferred objects of the present invention will become apparent from the following description.

SUMMARY OF THE INVENTION

[0009] According to a first aspect of the invention, there is provided a drill motor assembly comprising: a drill shaft; and at least two sub-motor assemblies operatively engaged with the drill shaft to cause the drill shaft to rotate.

[0010] Preferably the drill motor assembly further comprises a controller. Preferably the controller controls the at least two sub-motor assemblies to control output speed and torque of the assembly. Preferably the controller is configured to switch the at least two sub-motor assemblies between a series configuration and a parallel configuration. [001 1 ] Preferably the at least two sub-motor assemblies are internally switched by at least one of a valve, a cartridge and a switching element controlled by the controller. Alternatively the at least two sub-motor assemblies are externally switched by at least one of a valve, a cartridge and a switching element controlled by the controller.

[0012] Preferably the at least two sub-motor assemblies are operatively engaged with the drill shaft via gears. Preferably the drill shaft is driven by a spur gear. Preferably the at least two sub-motor assemblies are gear motors. Preferably each of the gear motors engages the gear of the drill shaft to drive the drill shaft. Alternatively the at least two sub-motor assemblies are geroler motors. Alternatively the at least two sub-motor assemblies are chain and sprocket motors, belt motor or magnetic motors.

[0013] Preferably the drill motor assembly comprises four sub-motor assemblies engaging the drill shaft. Preferably two of the four sub-motor assemblies are configured in series and two of the four sub-motor assemblies are configured in parallel. Alternatively the four sub-motor assemblies are configured in series. Alternatively the four sub-motor assemblies are configured in parallel.

[0014] Preferably the at least two sub-motor assemblies are fixed displacement motors or variable displacement motors. Alternatively the at least two sub-motor assemblies are fixed displacement motors and/or variable displacement motors.

[0015] Preferably the at least two sub-motor assemblies are evenly spaced radially around the drill shaft.

[0016] Preferably the drill shaft is hollow. [0017] Preferably, the drill shaft is configured to receive a drill rod. Alternatively, the drill shaft is configured to receive a chuck. Further alternatively, the drill shaft is configured to receive a drill adaptor. In another alternative, the drill shaft is configured to receive a rock bolt.

[0018] Preferably the drill motor assembly is mounted in a housing.

[0019] Preferably an output shaft of the drill shaft extends from an end of the housing.

[0020] According to a second aspect of the invention, there is provided a method of operating a drill motor assembly comprising the steps of: operatively engaging the drill shaft with at least two sub-motor assemblies; and energising the at least two sub-motor assemblies to cause the drill shaft to rotate.

[0021 ] Preferably the method further comprises the step of varying the output speed and torque of the drill shaft. Preferably the step of varying the output speed and torque of the drill shaft comprises switching a circuit configuration of the at least two sub-motor assemblies between a series configuration and a parallel configuration.

[0022] Preferably the step of engaging the drill shaft with at least two sub- motor assemblies comprises engaging the drill shaft with four sub-motor assemblies. Preferably the step of energising the at least two sub-motor assemblies to cause the drill shaft to rotate comprises energising the four sub- motor assemblies to cause the drill shaft to rotate. [0023] Preferably the method further comprises the step of receiving a drill rod in the drill shaft. Preferably the method further comprises the step of receiving a chuck. Preferably the method further comprises the step of receiving a drill adaptor. Preferably the method further comprises the step of receiving a rock bolt.

[0024] Preferably the method further comprises the step of switching the circuit configuration of the four sub-motor assemblies via the controller such that two of the sub-motor assemblies are in series and two of the sub-motor assemblies are in parallel.

[0025] Preferably the method further comprises the step of switching the circuit configuration of the four sub-motor assemblies via the controller such that at least two of the sub-motor assemblies are in series.

[0026] Preferably the method further comprises the step of switching the circuit configuration of the four sub-motor assemblies via the controller such that at least two of the sub-motor assemblies are in parallel.

[0027] Further features and advantages of the present invention will become apparent from the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By way of example only, preferred embodiments of the invention will be described more fully hereinafter with reference to the accompanying figures, wherein:

[0029] FIG. 1 is a perspective view of a drill motor assembly according to an embodiment of the present invention; [0030] FIG. 2 is a side view of the drill motor assembly illustrated in FIG. 1 ;

[0031 ] FIG. 3 is a cross-sectional view along lines AE of the drill motor assembly illustrated in FIG. 2;

[0032] FIG. 4 is a top view of the drill motor assembly illustrated in FIG. 1 ;

[0033] FIG. 5 is a cross-sectional view along lines AC of the drill motor assembly illustrated in FIG. 4;

[0034] FIG. 6 is a side view of the drill motor assembly illustrated in FIG. 1 ;

[0035] FIG. 7 is a cross-sectional bottom view from position AF of the drill motor assembly illustrated in FIG. 6;

[0036] FIG. 8 is a bottom view of the drill motor assembly illustrated in FIG. 1 ;

[0037] FIG. 9 is a hydraulic circuit schematic of a single speed drill motor assembly according to an embodiment of the present invention; and

[0038] FIG. 10 is a hydraulic circuit schematic of a dual speed drill motor assembly according another embodiment of the present invention.

DETAILED DESCRIPTION OF THE DRAWINGS

[0039] FIG. 1 and 2 illustrate a drill motor assembly 10. The drill motor assembly 10 shown in FIG. 1 includes a housing 100, a gearbox manifold 102and a hose manifold 106. The housing 100 houses a drill shaft 1 10 receiving a chuck 1 1 1 and four sub-motors motor assemblies 120, 130, 140, 150 positioned around and engaging the drill shaft 1 10.

[0040] FIG. 2 illustrates the drill motor assembly 10 without the hose manifold 106 and the chuck 1 1 1

[0041 ] As can be seen in the cross-section shown in FIG. 3, the drill shaft 1 10 and each of the four sub-motors 120, 130, 140 and 150 include a gear 1 12, 122, 132, 142 and 152, respectively. The pinion gears 122, 132, 142, 152 of the respective sub-motors 120, 130, 140, 150 engage the centrally disposed spur gear 1 12 of the drill shaft 1 10 at radially spaced apart locations that may be equally spaced apart, as shown. A person skilled in the art will appreciate that the sub-motors 120, 130, 140, 150 may be at unequally spaced apart locations.

[0042] For the purpose of illustration, the pinion gears 122, 132, 142, 152 are represented as being of an approximately 2:1 ratio to the spur gear 1 12. However, a person skilled in the art will appreciate that the ratio of the gears allows the output shaft to turn faster or slower than the motors and therefore the gears may be of any ratio combination as required.

[0043] The sub-motors 120, 130, 140, 150 are supplied by pressurised media such as air, oil, water or any other suitable means but are preferably supplied with hydraulic fluid. The motors can be supplied in any one of a constant speed, a series, parallel or a combination of series and parallel circuit arrangements.

[0044] The supply may be switched between these combinations by means of a valve, cartridge or switching element, which can be either embedded within the housing 100 or motors 120, 130, 140, 150 or can be external.

[0045] The four motors 122, 132, 142, 152 drive the drill shaft 1 10 and supply the power to rotate the drill shaft 1 10. The use of 2 or more fixed displacement motors allows for the total oil displacement to be varied by switching the motor circuit arrangement from series to parallel.

[0046] FIG. 4 illustrates a top view of the drill motor assembly 10 including the housing 100 and the drill shaft 1 10 with sectional line AC.

[0047] FIG. 5 illustrates a cross-sectional view along line AC showing the internal structure of the housing 100 of the drill motor assembly 10. The internal structure of the housing 100 of the drill motor assembly 10 includes two dowel pins 160, the drill shaft 1 10, a shaft seal 161 , two tapered roller bearings 162, the spur gear 1 12, the pinion gear 132 and a locking washer 163 coupled with a locking nut 164. The housing 100 further includes a plug 165, a shaft seal 166, the gearbox manifold 102, an O-ring 167, an internal circlip 168, a socket head cap screw 169, a needle roller bearing 170 and the gearbox gasket 104.

[0048] Further illustrated is pinion gear 132, a needle roller bearing 171 , a socket head cap screw 172 and the gearbox housing 106.

[0049] FIG. 6 illustrates a side view of the drill motor assembly 10 including the housing 100 and the drill shaft 1 10 with sectional line AF. From the present view, two pilot operated directional valves 173, a relief valve 174 and an internal plug 175 are visible. [0050] FIG. 7 illustrates a bottom view from position AF of the drill motor assembly 10. The sub-motors 120, 130, 140, 150 each include respective sealing O-rings 124, 134, 144, 154 for providing fluid seals.

[0051 ] FIG. 8 illustrates a bottom view of the drill motor assembly 10 including the housing 100 and the access port of the rear of the hollow shaft 1 13. From this view, it can be seen that the sub-motors 120, 130, 140, 150 each include respective internal plugs 126, 136, 146, 156. These plugs are typically internal hexagon 3/8" BSPP plugs but can be any suitable plug.

[0052] FIG. 9 illustrates a schematic circuit diagram 200 for controlling a single speed drill motor assembly with two motors 210, 220. The circuit 200 operates the motors 210, 220 in parallel and maintains the drill at a constant speed.

[0053] The circuit 200 includes four ports: a manually operated water flowline 230, a pressure flowline 240, a tank return flowline 250 and a switch pilot flowline 260 (when rotating in a clockwise direction when referenced from the rear).

[0054] The circuit 200 is controlled by a plunger controlled directional control valve 270.

[0055] FIG. 10 illustrates a schematic circuit diagram 300 for controlling a dual speed drill motor assembly with four motors 305, 310, 315, 320. The circuit 300 includes four ports: a water flowline 325, a pressure flowline 330, a tank return flowline 335 and a switch pilot flowline 340 (when rotating in a clockwise direction when referenced from the rear).

[0056] The circuit 300 is controlled by four control valves 345, 350, 355, 360. [0057] Control valve 345 is a plunger controlled directional control valve 270.

[0058] Directional control valves 350 and 355 are normally open pilot operated control valve. Directional control valve 360 is a normally closed directional valve.

[0059] The speed and torque may be varied by adjusting the hydraulic pressures and flow volumes through the four individual motors 305, 310, 315,

320. For example, for low speed, high torque the hydraulic fluid is supplied to motors 305, 310, 315, 320 each in a parallel configuration.

[0060] Alternatively, for high speed, low torque drive, the hydraulic fluid is channelled through the four motors 305, 31 0, 315, 320 in series to drive a drill shaft (not shown) and supply the power to rotate the drill shaft.

[0061 ] A person skilled in the art will appreciate that various combinations and numbers of motors may be provided without departing from the scope of this invention. For example, x number of motors could be arranged to drive a spur gear and the hydraulic circuit could supply fluid to any combination of the motors. An unlimited range of drive speeds and torques are therefore available to ensure optimum drilling conditions.

[0062] Advantageously, the present invention allows access to the rear of the output shaft.

[0063] A further advantage of the present invention is provided in that the assembly can use multiple smaller motors rather than a single large motor to achieve necessary speed and torque output. As a result, the size of the assembly can be reduced. Typically several smaller motors are more cost effective than one large motor and, accordingly, commercial benefits may also be obtainable.

[0064] Advantageously, the circuit configuration of the sub-motor assemblies can be switched to vary output speed and torque of the drill motor assembly without the need for swapping motors.

[0065] Another particular advantage is that the output shaft can be hollow which allows for the passing of flushing media through the shaft by the use of a needle inserted from the rear of the assembly.

[0066] Further advantageously, the hydraulic drive can be configured to allow for stacking of multiple hydraulic drives to increase torque loads and increase volumetric output.

[0067] In this specification, adjectives such as first and second, left and right, top and bottom, and the like may be used solely to distinguish one element or action from another element or action without necessarily requiring or implying any actual such relationship or order. Where the context permits, reference to an integer or a component or step (or the like) is not to be interpreted as being limited to only one of that integer, component, or step, but rather could be one or more of that integer, component, or step etc.

[0068] The above description of various embodiments of the present invention is provided for purposes of description to one of ordinary skill in the related art. It is not intended to be exhaustive or to limit the invention to a single disclosed embodiment. As mentioned above, numerous alternatives and variations to the present invention will be apparent to those skilled in the art of the above teaching. Accordingly, while some alternative embodiments have been discussed specifically, other embodiments will be apparent or relatively easily developed by those of ordinary skill in the art. The invention is intended to embrace all alternatives, modifications, and variations of the present invention that have been discussed herein, and other embodiments that fall within the spirit and scope of the above described invention.

[0069] In this specification, the terms 'comprises', 'comprising', 'includes', 'including', or similar terms are intended to mean a non-exclusive inclusion, such that a method, system or apparatus that comprises a list of elements does not include those elements solely, but may well include other elements not listed.