Rotary sleeve, rock drilling rig and method

Abstract

A rotary sleeve (17), a rock drill (6), and a method of manufacturing the rotary sleeve. The rotary sleeve is mountable around a drill shank adapter (8) of the rock drill and includes a plurality of internal teeth (22) having opposing first tooth flank surfaces (32) and second tooth flank surfaces (33) for transmitting rotation to the drill shank adapter. The internal teeth are provided with end pressure relief portions (38, 39) including a chamfered surface between the tooth flank surface and the end surface (34).

Description

Technical Field

[0001] This invention relates to a rotary sleeve for a rock drilling rig. The rotary sleeve can be mounted around a drill shank adapter and is designed to transmit rotational torque between the rotary device and the drill shank adapter.

[0002] The present invention further relates to a rock drilling rig and a method for manufacturing a rotating sleeve for a rock drilling rig. Background Technology

[0003] The scope of this invention is more specifically defined in the description of the invention.

[0004] Different types of rock drilling rigs are used in mines and other work sites. A rock drilling rig is equipped with one or more booms, with the drill bit positioned at the distal end of the boom. The rig includes an impact device with an impact piston configured to deliver impact pulses to the drill string via a drill shank adapter. The drill shank adapter is configured to transmit the impact pulses and torque from the rock drilling rig to the drill string. Surrounding the drill shank adapter is a rotating sleeve rotated by a rotating device. The rotating sleeve includes a plurality of internal teeth that mate with the teeth or splines of the drill shank adapter. These internal teeth are subjected to high stresses during rotation. In known constructions, several drawbacks have been found in this rotating sleeve, particularly regarding the durability of its internal teeth. Summary of the Invention

[0005] The object of this invention is to provide a novel improved rotary sleeve, a rock drilling rig equipped with such a rotary sleeve, and a method for manufacturing the rotary sleeve of the rock drilling rig.

[0006] One idea behind the disclosed solution is a rotating sleeve capable of mounting around a drill shank adapter of a rock drilling rig. The rotating sleeve includes a plurality of internal teeth, each having opposing first and second tooth flank surfaces for transmitting rotation to the drill shank adapter. The internal teeth have end surfaces at their longitudinal ends. Furthermore, the teeth are provided with at least a first end pressure relief portion, which includes a first chamfered surface located between the first tooth flank surface and the end surface.

[0007] In other words, each internal tooth of the rotating sleeve is provided with one or more end pressure relief portions, wherein the sharp edge between the tooth side surface and the end surface is beveled or chamfered. The tooth may have the end pressure relief portion at one or both ends.

[0008] The advantage of the disclosed solution is that the load directed at the end portion of the tooth can be reduced due to the end pressure relief section. This prevents material fracture at the end portion of the internal tooth and improves the durability of the rotating sleeve. Consequently, maintenance intervals can be longer, ensuring an effective drilling process. Furthermore, this solution allows for the use of greater torque when the risk of tooth tip fracture can be mitigated.

[0009] According to one embodiment, the internal teeth are spur teeth, meaning the teeth are straight. The internal teeth, having a straight and elongated structure, are easy to manufacture, and during use, the internal teeth allow axial movement between the rotating sleeve and the drill shank adapter.

[0010] According to one embodiment, alternatively, the internal teeth are helical or torsional teeth, i.e., the teeth are not straight.

[0011] According to one embodiment, the length of the rotating sleeve is greater than the diameter of the rotating sleeve, thereby making the teeth relatively long in the axial direction.

[0012] According to one embodiment, the length of the rotating sleeve is a multiple of the diameter of the rotating sleeve.

[0013] According to one embodiment, the first tooth flank surface is configured to transmit rotation when the drill shank rotates in the drilling direction, and the second tooth flank surface is configured to transmit rotation when the drill shank rotates in the opposite direction.

[0014] According to one embodiment, the end pressure relief portion has a flat surface. In other words, the chamfer between the first tooth side surface and the end surface is planar. Thus, the chamfer has a surface shape that is as simple as possible for manufacturing.

[0015] According to one embodiment, the end pressure relief portion has an alternately curved surface. In other words, the sharp edge between the first tooth side surface and the end surface is rounded.

[0016] According to one embodiment, the tooth is provided with a second end pressure-reducing portion, the second end pressure-reducing portion including a second chamfered surface located between the second tooth side surface and the end surface. In other words, all four sharp corners of the tooth are chamfered, providing four end pressure-reducing portions for the tooth. An advantage of this embodiment is that the tooth end is also protected from loads in the opposite rotational direction.

[0017] According to one embodiment, the tooth has an end pressure relief portion only at one end of the tooth. In other words, the corner of each tooth is chamfered at either the front or rear end of each tooth. The end pressure relief portion can be formed, for example, at the end that bears a greater load. In another embodiment, the tooth has a first end pressure relief portion or a second end pressure relief portion only at one end of the tooth. All different combinations of placing the end pressure relief portions are possible.

[0018] According to one embodiment, the rotating sleeve includes an inner first sleeve component and an outer second sleeve component that can be arranged within each other, wherein the inner first sleeve includes the internal teeth provided with the end pressure-reducing portion. In other words, the rotating sleeve has a two-part construction, wherein rotational torque is transmitted on the outer surface of the outer second sleeve component, and wherein a gear system is provided between the inner first sleeve component and the outer second sleeve component to transmit torque between the sleeve components.

[0019] According to one embodiment, the inner first sleeve component is a replaceable wear component.

[0020] According to one embodiment, the inner first sleeve component is made of bronze or a corresponding sliding bearing material.

[0021] According to an alternative embodiment, the rotating sleeve has a one-piece construction. Thus, the rotating sleeve includes internal teeth having the end pressure-reducing portion and external teeth for receiving torque from the rotating device.

[0022] According to one embodiment, the rotating sleeve has external teeth for receiving torque directly (integral structure) or indirectly (via an outer second sleeve component) from the rotating device.

[0023] According to one embodiment, at least the first tooth flank surface includes a lubrication groove. In other words, each first tooth flank surface has an axial lubrication groove to provide lubricant to the contact surface between the spline of the drill shank adapter and the first tooth flank surface of the rotating sleeve.

[0024] According to one embodiment, the depth and width of the lubrication groove are both at least 2 mm.

[0025] According to one embodiment, the depth of the lubrication groove is 2-4 mm.

[0026] According to one embodiment, both ends of the lubrication groove are open to the end pressure relief portion. In other words, the lubrication groove does not have closed ends, but rather extends to the tooth. In this configuration where the lubrication groove extends the entire length of the inner tooth, the end pressure relief portion effectively protects the high-load area around the lubrication groove at the end portion of the tooth.

[0027] According to one embodiment, the length of the end pressure relief portion is 8-14% of the total length of the internal teeth.

[0028] According to one embodiment, the lateral dimension of the end pressure relief portion is 10-16% of the distance between two opposing parallel tooth side surfaces.

[0029] According to one embodiment, the angle between the surface of the end pressure relief portion and the longitudinal axis of the internal teeth is 9-16°.

[0030] According to one embodiment, the shape of the end pressure relief portion corresponds to a truncated triangle.

[0031] According to one embodiment, the end pressure relief portion is formed by a wire cutting method based on electrical discharge machining (EDM). In other words, the end pressure relief portion is manufactured by wire EDM or spark machining technology.

[0032] According to an alternative solution, the end decompression section is formed by a chip removal milling cutter.

[0033] According to one embodiment, the disclosed solution relates to a rock drilling rig, comprising: a body; an impact device for generating impact pulses; a drill shank adapter for receiving the impact pulses and transmitting them as stress waves to a drill string capable of being connected to the drill shank adapter; a rotating device for rotating the drill shank adapter about its longitudinal axis; and a rotating sleeve that surrounds the drill shank adapter and transmits torque from the rotating device to the drill shank adapter. Furthermore, the rotating sleeve is the rotating sleeve according to any of the features and embodiments disclosed in this document.

[0034] According to one embodiment, the disclosed solution relates to a method of manufacturing a rotary sleeve for a rock drilling rig, wherein the rotary sleeve is mountable around a drill shank adapter, the rotary sleeve being used to transmit torque between the rotary device and the drill shank adapter. The method includes: providing a plurality of internal teeth to the rotary sleeve, wherein the internal teeth include a first tooth flank surface and a second tooth flank surface; and providing end surfaces at longitudinal ends of the internal teeth. The method further includes chamfering the edges between the first tooth flank surface and the end surface of the teeth to provide the end pressure relief portion to the teeth. The end pressure relief portion protects the tooth ends from breakage due to excessive load.

[0035] The disclosed embodiments described above can be combined to form a suitable solution having the desired features described above. Attached Figure Description

[0036] Some embodiments are described in more detail in the accompanying drawings.

[0037] Figure 1 This is a schematic side view of a rock drilling rig used for surface drilling.

[0038] Figure 2 This is a schematic diagram of a hydraulic rock drilling rig.

[0039] Figure 3 This is a schematic cross-sectional side view of the front of a rock drilling rig.

[0040] Figure 4 This is a schematic side view of a drill shank adapter, which has a spline at its rear end to receive rotational torque.

[0041] Figure 5 This is a schematic diagram of a rotating sleeve, on the inside of which a splined drill shank adapter can be arranged.

[0042] Figure 6 This is a schematic diagram of the internal teeth of the rotating sleeve as viewed along its axial direction.

[0043] Figure 7 yes Figure 5 The diagram shows the axial direction of the rotating sleeve.

[0044] Figure 8 yes Figure 5 and Figure 7 A schematic cross-sectional side view of the rotating sleeve shown.

[0045] Figure 9 This is a schematic diagram of a rotating sleeve with internal teeth, which have milled end pressure-reducing portions.

[0046] Figure 10 This is a schematic diagram of the milled internal teeth of the rotating sleeve, viewed in the axial direction.

[0047] Figure 11 -Not covered within the scope of the claims- is a schematic diagram of a rotating sleeve with internal teeth but no lubrication grooves.

[0048] Figure 12 -Not covered within the scope of the claims- is a schematic diagram of a rotating sleeve with an end pressure relief portion located only at the rear end of the internal teeth of the sleeve, and

[0049] Figure 13 This is a schematic diagram of a rotating sleeve, with end pressure relief sections provided at both ends of the internal teeth of the sleeve.

[0050] For clarity, the accompanying drawings illustrate some embodiments of the disclosed solution in a simplified manner. In the drawings, the same reference numerals denote the same elements. Detailed Implementation

[0051] Figure 1 A rock drilling rig 1 intended for surface drilling is shown. The rock drilling rig 1 includes a movable carrier 2 and at least one boom 3 connected to the carrier 2. A drilling unit 4 is located at the distal end of the boom 3, on which a feed beam 5 and a rock drilling rig 6 supported are mounted. A drill string 7 can be connected to the rock drilling rig 6. The rock drilling rig 6 includes a drill shank adapter 8 at its front end FE for connecting the drill string 7. The rock drilling rig 6 further includes an impact device 9 and a rotating device 10. The rock drilling rig 6 can be moved along the feed beam 5 in the drilling direction A by means of the feed device 11. During drilling, impact pulses are generated by the impact device and transmitted to the rotating drill shank adapter 8, which transmits the impact pulses and torque to the drill string 7. A flushing fluid flow is delivered through a hollow structure to the drill shank adapter 8 and continues through the drill string 7 to the bottom of the borehole to flush away drill cuttings.

[0052] Figure 2 A rock drilling rig 6 is disclosed, comprising a main body 12, an impact device 9, a rotating device 10, and a gearbox G. A flushing housing 13 and a drill shank adapter 8 are mounted at the front end FE of the gearbox G. A flushing agent, such as water, is delivered to the flushing housing 13 or the flushing head via a flushing channel 14.

[0053] Figure 3The gearbox G of the rock drilling rig 6 is disclosed. The impact surface 15 of the drill shank adapter 8 receives impact pulses from the impact piston 16, and rotational torque is transmitted to the drill shank adapter 8 via a rotating sleeve 17. The rotating sleeve 17 is rotated by a rotating device 10 connected to the rotating sleeve 17 via a gear 18. The rotating sleeve 17 can be a single-piece transmission element, or it can include... Figure 3 The two components are shown. The two-piece construction may include an inner first rotating sleeve component 17a and an outer second rotating sleeve component 17b, with a gear 19 between them. The rear end of the drill shank adapter 8 may be surrounded by the drill shank sleeve 20 for transmitting axial force in the drilling direction A and for transmitting axial force in the opposite direction, for use with the drill shank adapter 8. The drill shank adapter 8 includes a spline 21 or corresponding teeth that contact the internal teeth 22 of the rotating sleeve 17.

[0054] The tooth flank surface of the internal gear 22 may include a lubrication groove 23 for gear contact between the rotating sleeve 17 and the drill shank adapter 8. The lubrication groove 23 may be open at both ends, and lubricating oil may be guided into the groove through a lubrication channel 24. Figure 3 In the diagram, arrows indicate the flow of the lubricating medium and the different lubrication channels and routes. Some examples of these routes are indicated by reference numerals 25 and 26.

[0055] Figure 4 A drill shank adapter 8 is disclosed, wherein the connector 27 includes a shoulder 28 and a connecting thread 29. Alternative connector end arrangements may also be implemented. A portion for receiving impact pulses IP may be provided at the rear end 30 of the drill shank adapter 8, and an impact surface 15 is provided. A spline 21 is also present for transmitting rotation R for the drill shank adapter 8. An opening 32 at the intermediate section 31 is used to guide flushing fluid into the interior of the drill shank adapter and into the drill string 7.

[0056] Figure 5 A rotary sleeve 17 is disclosed, within which a drill shank adapter for a rock drilling rig can be installed. The rotary sleeve 17 includes a plurality of internal teeth 22, each having opposing first tooth flank surfaces 32 and second tooth flank surfaces 33 for transmitting rotation to the drill shank adapter. Each internal tooth 22 has an end surface 34 at its longitudinal end. During normal drilling, the rotary sleeve 22 can rotate in direction R and, by means of a rotating device, in the opposite direction. External teeth 35 are present on the outer surface of the rotary sleeve 22 for transmitting rotational torque. The external teeth 22 can be formed as described above. Figure 3 The gear 19 shown. The outer teeth 35 may be located at the front end 36 of the rotating sleeve 17, and the rear end 37 may be without gears.

[0057] Figure 5 As further shown, the internal teeth 22 have end pressure relief portions 38 and 39 provided between the end surface 34 and the tooth side surfaces 32 and 33. Figure 6 A detailed view of one of the internal teeth 22 of the rotating sleeve is shown. Figure 7 The same rotating sleeve 17 is shown from different viewing directions, and Figure 8 These are cross-sectional views of the same structure.

[0058] Figures 5-8 As shown, the first tooth flank surface 32 of the internal tooth 22 includes a lubrication groove 23. The lubrication groove 23 may extend end-to-end into the internal tooth. Thus, both ends of the lubrication groove are open to the first end pressure relief portions 38, 39. Lubrication channels or grooves 40 may be present on the front surface to guide lubricating fluid.

[0059] Figure 5 The angle K between the surface of the end pressure relief parts 38 and 39 and the longitudinal axis of the internal tooth 22 is further disclosed to be 9-16°.

[0060] Figure 7 The rotating sleeve 17 is shown axially and is viewed from its end direction. Figure 7 and cross-section Figure 8 As shown, there are also end pressure relief portions 38 and 39 at the rear end of the internal tooth 22.

[0061] Figure 5 , Figure 7 , Figure 8 , Figure 9 and Figures 11-13 The rotating sleeve disclosed in the paper can be Figure 3 The inner rotating sleeve component 17a is shown, and an outer rotating sleeve component can be arranged around the inner rotating sleeve component 17a. In other words, the rotating sleeve arrangement can include an inner first sleeve component and an outer second sleeve component that can be arranged within each other. Figure 7 In the accompanying drawing, reference numeral 41 indicates the outermost second sleeve component by a dashed line. The innermost first sleeve includes internal teeth with end pressure relief portions, and teeth or other transmission elements are located between the sleeve components to transmit torque between them. In another possible embodiment, the rotational torque is directly transmitted on a one-piece rotating sleeve, which includes internal and external teeth and end pressure relief portions located on the internal teeth.

[0062] Figure 9 and Figure 10As shown, the internal teeth 22 of the rotating sleeve 17 are only provided with a first end pressure relief portion 38. Therefore, in this rotating sleeve 17, the ends of the internal teeth 22 are only protected in the normal rotation direction R to prevent high loads. Furthermore, only the first tooth side surface 32 of this internal tooth is provided with a lubrication groove 23. In the reverse rotation direction, the load is very small, so it is not necessary to provide end pressure relief portions and lubrication grooves on the opposite second tooth side surface 33.

[0063] Figure 9 and Figure 10 The end pressure relief portion 38 of the internal tooth 22 shown is produced by milling, therefore some additional markings 42 produced by the chip removal tool can be seen on the inner surface of the rotating sleeve 17. When the end pressure relief portions 38, 39 are manufactured using a wire EDM method based on electrical discharge machining, such markings are absent, which is noticeable during inspection. Figures 5-8 The timing is obvious.

[0064] Figure 11 -Not covered within the scope of the claims- A rotating sleeve 17 is disclosed, which differs from the previously shown rotating sleeve in that the tooth flank surfaces 32, 33 of the internal teeth 22 do not have lubrication grooves. The internal teeth 22 are provided with end pressure relief portions 38, 39 at both ends.

[0065] Figure 12 -Not covered by the subject matter of the claims- A rotating sleeve 17 is disclosed, which includes end pressure relief portions 38, 39 only at the rear end of the internal teeth 22. Furthermore, the tooth flank surfaces 32, 33 of the internal teeth do not have lubrication grooves.

[0066] Figure 13 It was made public compared to the previous Figure 5 Similar features, but more clearly showing that the end of the internal tooth 22 may be provided with end pressure relief portions 38, 39.

[0067] The accompanying drawings and related descriptions are intended only to illustrate the ideas of the invention. The invention may vary within the scope of the claims in its details.

Claims

1. A rotating sleeve (17) that can be mounted around a drill shank adapter (8) of a rock drill (6). And wherein, The rotating sleeve (17) includes a plurality of internal teeth (22), the internal teeth being provided with opposing first tooth side surfaces (32) and second tooth side surfaces (33) for transmitting rotation to the drill shank adapter (8). Furthermore, the internal tooth (22) has an end surface (34) at the longitudinal end of the internal tooth (22). Its features The internal tooth (22) is provided with at least a first end pressure relief portion (38), the first end pressure relief portion (38) including a first oblique surface between the first tooth side surface (32) and the end surface (34); At least the first tooth flank surface (32) includes a lubrication groove (23); and Both ends of the lubrication groove (23) are open to the first end pressure relief part (38).

2. The rotating sleeve according to claim 1, characterized in that, The internal tooth (22) is provided with a second end pressure relief portion (39), which includes a second oblique surface located between the second tooth side surface (33) and the end surface (34).

3. The rotating sleeve according to claim 2, characterized in that, The rotating sleeve (17) includes an inner first sleeve component (17a) and an outer second sleeve component (17b) that can be arranged within each other, wherein the inner first sleeve component (17a) includes the inner teeth (22) provided with the first end pressure relief portion (38) and the second end pressure relief portion (39).

4. The rotating sleeve according to any one of claims 2-3, characterized in that: The angle (K) between the surface of each of the first end pressure relief portion (38) and the second end pressure relief portion (39) and the longitudinal axis of the internal tooth (22) is 9-16°.

5. The rotating sleeve according to any one of claims 2-3, characterized in that: The first end pressure relief portion (38) and the second end pressure relief portion (39) are formed by wire cutting method based on electrical discharge machining.

6. A rock drilling rig (6), comprising: Main body (12); Impact device (9), said impact device is used to generate impact pulse (IP); Drill shank adapter (8), which is used to receive the impact pulse (IP) and transmit the impact pulse (IP) as a stress wave to the drill string (7) that can be connected to the drill shank adapter (8). A rotating device (10) for rotating the drill shank adapter (8) about its longitudinal axis; and A rotating sleeve (17) surrounds the drill shank adapter (8) and transmits torque from the rotating device (10) to the drill shank connector (8). Its features are, The rotating sleeve (17) is the rotating sleeve according to any one of the preceding claims 1-5.

7. A method of manufacturing a rotary bushing (17) of a rock drilling rig (6), in which The rotating sleeve (7) can be mounted around the drill shank adapter (8) to transmit torque between the rotating device (10) and the drill shank adapter (8); And the method includes: The rotating sleeve (17) is provided with a plurality of internal teeth (22), wherein the internal teeth (22) include a first tooth side surface (32) and a second tooth side surface (33); and An end surface (34) is provided at the longitudinal end of the internal tooth (22). Its characteristics include the following steps, An oblique cut is made between the first tooth side surface (32) and the end surface (34) of the internal tooth (22) to provide end pressure relief portions (38, 39) for the internal tooth (22); and A lubrication groove (23) is provided on at least the first tooth side surface (32), wherein both ends of the lubrication groove (23) are open to the end pressure relief portion (38, 39).

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