A hydraulic arrangement

Abstract

A hydraulic arrangement for performing work by usage of fluid power. The hydraulic arrangement comprises one or more working chambers configured to be alternately evacuated and fed with fluid. The hydraulic arrangement comprises one or more channels for guiding one or more fluid streams to and / or from the one or more working chambers. The hydraulic arrangement comprises one or more passages having a first fluid port and a second fluid port. At least one channel of the one or more channels is connected to one of the one or more working chambers via one of the one or more passages. The size of the second fluid port of the passage exceeds the size of the first fluid port of the same passage.

Description

[0001] A HYDRAULIC ARRANGEMENT

[0002] Technical Field

[0003] The disclosure relates to a hydraulic arrangement for performing work by usage of fluid power. Further, the disclosure relates to a hydraulic drilling machine, a hydraulic casing, a flushing head and a mining or construction machine each comprising such a hydraulic arrangement.

[0004] Background

[0005] Hydraulic arrangements for performing work by usage of fluid power may be used in various technical fields and for various applications. For example, hydraulic arrangements are used in mining or construction vehicles. Use cases include operating a dump box of a truck, operating an arm, bucket, or other tool, of an excavator. Hydraulic arrangements are also used in drilling rigs in various applications. Other examples of hydraulic arrangements include hydraulic rock drilling machines for drilling into to a rock formation, or rock, so as to break or fracture rock, and excavate and drill tunnels or rooms underground, or above ground. The hydraulic rock drilling machine may be mounted to a drilling rig. Some drilling rigs may be provided with means for the propulsion of the drilling rig, such as wheels or continuous tracks, while some drilling rigs may be without means for propulsion.

[0006] Summary

[0007] The inventors have found drawbacks in conventional solutions for hydraulic arrangements for performing work by usage of fluid power. For example, some conventional solutions are not efficient or robust enough and can be further improved.

[0008] An object of embodiments of the disclosure is to provide a solution which mitigates or solves drawbacks and problems of conventional solutions.

[0009] The above and further objects are solved by the subject matter of the appended independent claim. Further advantageous embodiments can be found in the dependent claims. According to a first aspect of the disclosure, the above mentioned and other objects are achieved with a hydraulic arrangement for performing work by usage of fluid power. The hydraulic arrangement comprises one or more working chambers configured to be alternately evacuated and fed with fluid. Further, the hydraulic arrangement comprises one or more channels for guiding one or more fluid streams to and / or from the one or more working chambers. The hydraulic arrangement further comprises one or more passages having a first fluid port and a second fluid port. At least one channel of the one or more channels is connected to one of the one or more working chambers via one of the one or more passages. The size of the second fluid port of the passage exceeds the size of the first fluid port of the same passage.

[0010] An advantage of the hydraulic arrangement according to the first aspect is an improved arrangement for the performance of work by usage of fluid power. An advantage of the hydraulic arrangement according to the first aspect is an improved guidance of fluid streams in a hydraulic arrangement for performing work by usage of fluid power. An advantage of the hydraulic arrangement according to the first aspect is a more efficient and robust arrangement for performing work by usage of fluid power in relation to conventional solutions. An advantage of the hydraulic arrangement according to the first aspect is that the wear on the hydraulic arrangement is reduced.

[0011] The inventors of the present invention have found that in conventional hydraulic arrangements, such as in conventional hydraulic drilling machines, the flow rate of the hydraulic fluid is momentarily very high and pressure levels vary locally from low to high, for example during each percussion cycle of a hydraulic drilling machine. The inventors of the present invention have identified that local flow losses related to channel geometry is a common problem for conventional hydraulic systems. Conventional hydraulic systems, for example in a hydraulic drilling machine, are momentarily exposed to big variations in both pressure and flow levels. In conventional designs of hydraulic drilling machines, valve and piston chambers are connected through straight radial holes to the hydraulic channels. Conventional designs lead to sharp edges and non-ideal transitioning between hydraulic volumes and channels, which results in unnecessary flow losses and potentially cavitation damage. The inventors of the present invention have found that there is a need to reduce flow losses and also lower the risk of cavitation, or other damages of a hydraulic system and its hydraulic channels and chambers.

[0012] An advantage of the hydraulic arrangement according to the first aspect is an optimized shape of the passage that connects the channel to the working chamber so as to reduce the flow losses caused by conventional geometries. By way of the innovative passage, an increased efficiency is provided. With a smoother transitioning between the channel and the working chamber, it is possible to avoid sharp edges that in conventional solutions cause a high flow velocity over the sharp edges, which leads to a pressure drop due to flow losses. This pressure drop is a reason for cavitation, especially if the ambient pressure is low.

[0013] It is to be understood that the difference between the size of the first fluid port and the size of the second fluid port is bigger than any difference only because of manufacturing or production tolerances. For some embodiments, it may be defined that the size of the second fluid port of the passage exceeds the size of the first fluid port of the same passage by at least 5 %, for example by at least 10 %, such as by at least 15 %, for example by at least 25 %, such as by at least 30 %.

[0014] According to an advantageous embodiment of the hydraulic arrangement according to the first aspect, at least one channel of the one or more channels is connected to one of the one or more working chambers by one of the one or more passages.

[0015] According to a further advantageous embodiment of the hydraulic arrangement according to the first aspect, one of the second fluid port and first fluid port of the passage adjoins the working chamber.

[0016] According to another advantageous embodiment of the hydraulic arrangement according to the first aspect, the first fluid port of the passage is connected to the working chamber via the second fluid port of the same passage. An advantage of this embodiment is a further improved arrangement for the performance of work by usage of fluid power. An advantage of this embodiment is an even more efficient and robust arrangement for performing work by usage of fluid power. An advantage of this embodiment is a further improved guidance of fluid streams in a hydraulic arrangement.

[0017] According to yet another advantageous embodiment of the hydraulic arrangement according to the first aspect, the cross-section area of the passage at the second fluid port exceeds the cross-section area of the same passage at the first fluid port. An advantage of this embodiment is a further improved arrangement for the performance of work by usage of fluid power. An advantage of this embodiment is an even more efficient and robust arrangement for performing work by usage of fluid power. An advantage of this embodiment is a further improved guidance of fluid streams in a hydraulic arrangement. It is to be understood that the difference between the size of the cross-section area of the first fluid port and the size of the cross-section area of the second fluid port is bigger than any difference only because of manufacturing or production tolerances. For some embodiments, it may be defined that the crosssection area of the passage at the second fluid port exceeds the cross-section area of the same passage at the first fluid port by at least 5 %, for example by at least 10 %, such as by at least 15 %, for example by at least 25 %, such as by at least 30 %.

[0018] According to a second aspect of the disclosure, the above mentioned and other objects are achieved with a hydraulic drilling machine comprising one or more hydraulic arrangements according to any one of the embodiments disclosed above or below. The hydraulic drilling machine comprises a fluid-operated piston. Two or more of the one or more working chambers are configured to be alternately evacuated and fed with fluid for the fluid-operation of the piston.

[0019] Advantages of the hydraulic drilling machine according to the second aspect correspond to advantages of the hydraulic arrangement according to the first aspect and its embodiments mentioned above or below. For some embodiments, the hydraulic drilling machine may be referred to as a hydraulic rock drilling machine.

[0020] According to an advantageous embodiment of the hydraulic drilling machine according to the second aspect, two of the one or more working chambers comprise a rear working chamber and a front working chamber, wherein the rear working chamber and the front working chamber are configured to be alternately evacuated and fed with fluid for the fluid-operation of the piston, wherein one or more channels of the one or more channels is / are connected to one or more of the rear working chamber and front working chamber via one or more of the one or more passages, and wherein the first fluid port of the passage is connected to one of the rear working chamber and front working chamber via the second fluid port of the same passage.

[0021] According to a further advantageous embodiment of the hydraulic drilling machine according to the second aspect, the first fluid port comprises an orifice for one or more of the one or more fluid streams, wherein the second fluid port comprises a mouth for one or more of the one or more fluid streams, and wherein the size of the mouth of the second fluid port exceeds the size of the orifice of the first fluid port.

[0022] According to another advantageous embodiment of the hydraulic drilling machine according to the second aspect, the passage is tapered in a direction from the second fluid port to the first fluid port. An advantage of this embodiment is a further improved guidance of fluid streams in a hydraulic drilling machine. An advantage of this embodiment is an even more efficient and robust hydraulic drilling machine in relation to conventional solutions.

[0023] According to yet another advantageous embodiment of the hydraulic drilling machine according to the second aspect, the passage is flared in a direction from the first fluid port to the second fluid port. An advantage of this embodiment is a further improved guidance of fluid streams in a hydraulic drilling machine. An advantage of this embodiment is an even more efficient and robust hydraulic drilling machine in relation to conventional solutions.

[0024] According to still another advantageous embodiment of the hydraulic drilling machine according to the second aspect, the passage is tunneled. According to an advantageous embodiment of the hydraulic drilling machine according to the second aspect, the passage has an inner surface extending from the first fluid port to the second fluid port.

[0025] According to a further advantageous embodiment of the hydraulic drilling machine according to the second aspect, wherein the inner surface of the passage is step-free. An advantage of this embodiment is a further improved guidance of fluid streams in a hydraulic drilling machine. An advantage of this embodiment is an even more efficient and robust hydraulic drilling machine in relation to conventional solutions.

[0026] According to another advantageous embodiment of the hydraulic drilling machine according to the second aspect, inner surface of the passage is smooth. An advantage of this embodiment is a further improved guidance of fluid streams in a hydraulic drilling machine. An advantage of this embodiment is an even more efficient and robust hydraulic drilling machine in relation to conventional solutions.

[0027] According to yet another advantageous embodiment of the hydraulic drilling machine according to the second aspect, at the second fluid port the inner surface of the passage is curved in a direction away from the first fluid port. An advantage of this embodiment is a further improved guidance of fluid streams in a hydraulic drilling machine. An advantage of this embodiment is an even more efficient and robust hydraulic drilling machine in relation to conventional solutions.

[0028] According to still another advantageous embodiment of the hydraulic drilling machine according to the second aspect, at the first fluid port the inner surface of the passage is curved in a direction away from the second fluid port. An advantage of this embodiment is a further improved guidance of fluid streams in a hydraulic drilling machine. An advantage of this embodiment is an even more efficient and robust hydraulic drilling machine in relation to conventional solutions.

[0029] According to an advantageous embodiment of the hydraulic drilling machine according to the second aspect, the hydraulic drilling machine comprises a casing forming the one or more working chambers, forming the one or more channels and forming the one or more passages. According to a third aspect of the disclosure, the above mentioned and other objects are achieved with a hydraulic casing comprising one or more hydraulic arrangements according to any one of the embodiments disclosed above or below, wherein the hydraulic casing forms the one or more working chambers, the one or more channels and the one or more passages.

[0030] Advantages of the hydraulic casing according to the third aspect correspond to advantages of the hydraulic arrangement according to the first aspect and its embodiments mentioned above or below.

[0031] According to a fourth aspect of the disclosure, the above mentioned and other objects are achieved with a flushing head comprising one or more hydraulic arrangements according to any one of the embodiments disclosed above or below.

[0032] Advantages of the flushing head according to the fourth aspect correspond to advantages of the hydraulic arrangement according to the first aspect and its embodiments mentioned above or below.

[0033] According to a fifth aspect of the disclosure, the above mentioned and other objects are achieved with a mining or construction machine comprising one or more of the group of:

[0034] • a compressor for controlling the one or more fluid streams; and

[0035] • a pump for controlling the one or more fluid streams, and comprising one or more of the group of:

[0036] • a hydraulic arrangement according to any one of the embodiments disclosed above or below;

[0037] • a hydraulic drilling machine according to any one of the embodiments disclosed above or below;

[0038] • a hydraulic casing according to any one of the embodiments disclosed above or below; and

[0039] • a flushing head according to any one of the embodiments disclosed above or below. Advantages of the mining or construction machine according to the fifth aspect correspond to advantages of the hydraulic arrangement according to the first aspect and / or advantages of the hydraulic drilling machine according to the second aspect and their embodiments mentioned above or below.

[0040] For some embodiments, the mining or construction machine may comprise, or be in the form of a drilling rig, or a mining or construction vehicle.

[0041] The above-mentioned features and embodiments of the hydraulic arrangement, of the hydraulic drilling machine, of the hydraulic casing, of the flushing head and of the mining or construction machine may be combined in various possible ways providing further advantageous embodiments.

[0042] Further advantageous embodiments of the hydraulic arrangement, of the hydraulic drilling machine, of the hydraulic casing, of the flushing head and of the mining or construction machine and further advantages with the embodiments emerge from the detailed description of embodiments.

[0043] Brief Description of the Drawings

[0044] Embodiments of the disclosure will now be illustrated, for exemplary purposes, in more detail by way of embodiments and with reference to the enclosed drawings, where similar references are used for similar parts, in which:

[0045] Figure 1A is a schematic sectional side view of an embodiment of the hydraulic arrangement according to the first aspect of the disclosure and of an embodiment of the hydraulic casing according to the third aspect of the disclosure;

[0046] Figure 1 B is a schematic cross-section view of the hydraulic arrangement of figure 1 A;

[0047] Figure 2 is an enlargement of a region of the hydraulic arrangement of figure 1 A;

[0048] Figure 3A is a cross-section along C-C of the passage at the first fluid port of the hydraulic arrangement of figure 2;

[0049] Figure 3B is a cross-section along D-D of the passage at the second fluid port of the hydraulic arrangement of figure 2; Figure 4 is a schematic sectional side view of another embodiment of the hydraulic arrangement according to the first aspect of the disclosure, of an embodiment of the hydraulic drilling machine according to the second aspect of the disclosure and of another embodiment of the hydraulic casing according to the third aspect of the disclosure;

[0050] Figure 5 is a schematic sectional side view of a modification of the hydraulic arrangement of figure 4, a modification of the hydraulic drilling machine of figure 4, and a modification of the hydraulic casing of figure 4;

[0051] Figure 6 is a schematic sectional side view of still another embodiment of the hydraulic arrangement according to the first aspect of the disclosure, of a yet another embodiment of the hydraulic drilling machine according to the second aspect of the disclosure and of yet another embodiment of the hydraulic casing according to the third aspect of the disclosure;

[0052] Figure 7 is a schematic sectional side view of an embodiment of the flushing head according to the fourth aspect of the disclosure;

[0053] Figure 8 is a schematic side view of an embodiment of the mining or construction machine according to the fifth aspect of the disclosure;

[0054] Figure 9 is a schematic side view of another embodiment of mining or construction machine according to the fifth aspect of the disclosure; and

[0055] Figure 10 is a schematic side view of yet another embodiment of the mining or construction machine according to the fifth aspect of the disclosure.

[0056] Detailed Description

[0057] With reference to figures 1 and 7 aspects of embodiments of the hydraulic arrangement 300a; 300b; 300c; 300d for performing work by usage of fluid power, embodiments of the hydraulic drilling machine 104b1 ; 212, embodiments of the hydraulic casing 324a; 324b; 324c; 324d and embodiments of the flushing head 326 are schematically illustrated.

[0058] With reference to figures 1A to 2, the hydraulic arrangement 300a comprises one or more working chambers 302a configured to be alternately evacuated and fed with fluid, such as liquid fluid, for example oil, or any other hydraulic medium. The hydraulic arrangement 300a comprises one or more channels 304a for guiding one or more fluid streams, such as liquid fluid streams, to and / or from the one or more working chambers 302a. The hydraulic arrangement 300a comprises one or more passages 306a having a first fluid port 308a, or opening, and a second fluid port 310a, or opening. At least one channel 304a of the one or more channels 304a is connected to one 302a of the one or more working chambers 302a via one of the one or more passages 306a. The size of the second fluid port 310a of the passage 306a exceeds the size of the first fluid port 308a of the same passage 306a.

[0059] As already mentioned above, it is to be understood that the difference between the size of the first fluid port 308a and the size of the second fluid port 310a is bigger than any difference only because of manufacturing or production tolerances. For some embodiments, it may be defined that the size of the second fluid port 310a of the passage 306a exceeds the size of the first fluid port 308a of the same passage 306a by at least 5 %, for example by at least 10 %, such as by at least 15 %, for example by at least 25 %, such as by at least 30 %. For some embodiments, the first fluid port 308a-c may be referred to as a fluid inlet port 308a-c, while the second fluid port 310a- c may be referred to as a fluid outlet port 31 Oa-c, or vice versa.

[0060] With reference to figures 1A to 2, for some embodiments, it may be defined that at least one channel 304a of the one or more channels 304a is connected to one of the one or more working chambers 302a by one 306a of the one or more passages 306a. For some embodiments, it may be defined that one of the second fluid port 310a and first fluid port 308a of the passage 306a adjoins the working chamber 302a. For some embodiments, it may be defined that the first fluid port 308a of the passage 306a is connected to the working chamber 302a via the second fluid port 310a of the same passage 306a.

[0061] With reference to figures 3A and 3B, for some embodiments, it may be defined that the cross-section area A2, or the cross-sectional area A2, of the passage 306a at the second fluid port 310a exceeds the cross-section area A 1 of the same passage 306a at the first fluid port 308a. As already mentioned above, it is to be understood that the difference between the size of the cross-section area of the first fluid port and the size of the cross-section area of the second fluid port is bigger than any difference only because of manufacturing or production tolerances. For some embodiments, it may be defined that the cross-section area of the passage at the second fluid port exceeds the cross-section area of the same passage at the first fluid port by at least 5 %, for example by at least 10 %, such as by at least 15 %, for example by at least 25 %, such as by at least 30 %.

[0062] With reference to figures 4 to 6, embodiments of the hydraulic drilling machine 104b1 ; 212 comprise one or more hydraulic arrangements 300a; 300b; 300c; 300d according to any one of the embodiments disclosed above or below. Embodiments of the hydraulic drilling machine 104b1 ; 212 comprise a fluid-operated piston 322. Two or more of the one or more working chambers 302b, 302c are configured to be alternately evacuated and fed with fluid, such as liquid fluid, for the fluid-operation of the piston 322. For some embodiments, the hydraulic drilling machine may be referred to as a hydraulic rock drilling machine.

[0063] It is be understood that several items of the embodiments of the hydraulic arrangements 300b; 300c; 300d of figures 4 to 7 correspond, or may correspond, to items of the embodiment of the hydraulic arrangements 300a of figures 1A to 3B disclosed above in connection with figures 1A to 3B and are thus not repeated hereinafter.

[0064] With reference to figures 4 to 6, for some embodiments, it may be defined that two 302b, 302c of the one or more working chambers 302b-c comprise a rear working chamber 302b and a front working chamber 302c. The rear working chamber 302b and the front working chamber 302c are configured to be alternately evacuated and fed with fluid for the fluid-operation of the piston 322. One or more channels 304b-c of the one or more channels 304b-c is / are connected to one or more of the rear working chamber 302b and front working chamber 302c via (or by) one or more of the one or more passages 306b-c. The first fluid port 308b-c of the passage 306b-c is connected to one 302b, 302c of the rear working chamber 302b and front working chamber 302c via the second fluid port 310b-c of the same passage 306b-c.

[0065] In the embodiment of figures 4 and 5, one channel 304b of the one or more channels 304b-c is connected to the front working chamber 302c via (or by) one passage 306b. In the embodiment of figure 6, one channel 304b of the one or more channels 304b-c is connected to the front working chamber 302c via (or by) one passage 306b while another one 304c of the one or more channels 304b-c is connected to the rear working chamber 302 via (or by) one passage 306c.

[0066] With reference to figures 2 and 5, for some embodiments, it may be defined that the first fluid port 308a-c comprises an orifice 312a-b for one or more of the one or more fluid streams and that the second fluid port 310a-c comprises a mouth 314a-b for one or more of the one or more fluid streams. The size of the mouth 314a-b of the second fluid port 31 Oa-c exceeds the size of the orifice 312a-b of the first fluid port 308a-c.

[0067] With reference to figures 2 and 4 to 6, for some embodiments, it may be defined that the passage 306a-c is tapered in a direction 316 from the second fluid port 31 Oa-c to the first fluid port 308a-c. For some embodiments, it may be defined that the passage 306a-c is flared in a direction 318 from the first fluid port 308a-c to the second fluid port 31 Oa-c. For some embodiments, it may be defined that the passage 306a-c is tunneled or forms a funnel.

[0068] With reference to figures 2 and 4 to 6, for some embodiments, it may be defined that the passage 312a-c has an inner surface 320a-c extending from the first fluid port 308a-c to the second fluid port 31 Oa-c. For some embodiments, the inner surface 320a- c of the passage 306a-c is step-free. For some embodiments, the inner surface 320a- c of the passage 306a-c is smooth.

[0069] With reference to figure 5, for some embodiments, at the second fluid port 306b-c, the inner surface 320b of the passage 306b may be curved in a direction 318 away from the first fluid port 308b. For some embodiments, at the first fluid port 308b, the inner surface 320b of the passage 306b may be curved in a direction 316 away from the second fluid port 310b.

[0070] With reference to figures 2 and 4 to 6, for some embodiments, it may be defined that the hydraulic drilling machine 104b1 ; 212 comprises a casing 324a-c forming (or defining) the one or more working chambers 302a-c, the one or more channels 304a- c and the one or more passages 306a-c. For some embodiments, the casing 324a-c may be referred to as a liner. With reference to figure 1 to 7, a hydraulic casing 324a; 324b; 324c; 324c is provided. The hydraulic casing 324a; 324b; 324c; 324d comprises one or more hydraulic arrangements 300a-d according to any one of the embodiments disclosed above or below. The hydraulic casing 324a-d forms (or defines) the one or more working chambers 302a-c, the one or more channels 304a-c and the one or more passages 306a-c. For some embodiments, the hydraulic casing 324a-d may be in the form of a casing, or a liner, for a piston. For some embodiments, the hydraulic casing 324a-d may be in the form of a casing, or a liner, for a valve. For some embodiments, the hydraulic casing 324a-d may be in the form of a casing, or a liner, for a hydraulic drilling machine 104b1 ; 212. For some embodiments, the hydraulic casing 324d may be in the form of a casing, or a liner, for a flushing head 326 (see figure 7).

[0071] With reference to figure 7, a flushing head 326 is provided. The flushing head 326 comprises one or more hydraulic arrangements 300d according to any one of the embodiments disclosed above or below. Thus, the hydraulic arrangement 300d of the flushing head 326 of figure 7 also includes one or more working chambers 302d configured to be alternately evacuated and fed with fluid. The hydraulic arrangement 300d of figure 7 also includes one or more channels 304d for guiding one or more fluid streams to and / or from the one or more working chambers 302d. The hydraulic arrangement 300d of figure 7 also includes one or more passages 306d having a first fluid port 308d and a second fluid port 31 Od. At least one channel 304d of the one or more channels 304d is connected to one of the one or more working chambers 302d via one of the one or more passages 306d. The size of the second fluid port 31 Od of the passage 306d exceeds the size of the first fluid port 308d of the same passage 306d. The flushing head 326 may also include a hydraulic casing 324d.

[0072] With reference to figure 8 to 10, aspects of embodiments of the mining or construction machine 100a, 100b, 100c are schematically illustrated. For some embodiments, the mining or construction machine 100a, 100b, 100c may comprise, or be in the form of a drilling rig, or a mining or construction vehicle. The mining or construction machine 100a, 100b, 100c comprises one or more of the group of:

[0073] • a compressor 180; 216 for controlling the one or more fluid streams mentioned above; and

[0074] • a pump 105 for controlling the one or more fluid streams mentioned above. Further, the mining or construction machine 100a, 100b, 100c comprises one or more of the group of:

[0075] • a hydraulic arrangement 300a-d according to any one of the embodiments disclosed above or below;

[0076] • a hydraulic drilling machine 104b1 ; 212 according to any one of the embodiments disclosed above or below;

[0077] • a hydraulic casing 324a; 324b; 324c; 324d according to any one of the embodiments disclosed above or below; and

[0078] • a flushing head 326 according to any one of the embodiments disclosed above or below.

[0079] With reference to figure 8, the mining or construction machine 100a is schematically illustrated as a drilling rig, which also may be referred to as a rock drilling rig. The mining or construction machine 100a, or drilling rig, may be utilised in tunnelling, surface mining, underground mining, and rock reinforcement. The mining or construction machine 100a, or drilling rig, may be used, for example, for drilling drill holes, blast holes, grout holes, holes for installing rock bolts, water wells and other wells, as well as for piling and foundations drilling etc, in a rock formation 700a, for example during tunnelling or mining. The mining or construction machine 100a may rest and travel on a support surface 109, such as ground.

[0080] With reference to figure 8, in general, the mining or construction machine 100a may comprise a carrier 1 15 and one or more booms 101 attached to the carrier 1 15, where the booms 101 may carry associated drilling machines 104b1 and / or other tools. The mining or construction machine 100a illustrated in figure 8 includes one boom 101. A first end 101 a of the boom 101 may be attached in such a way that the boom 101 can pivot in relation to the carrier 1 15, such as a vehicle, via one or more articulated connections (not shown). The mining or construction machine 100a may include a feed beam 103 carrying and guiding a feeder 104a, which is movable in relation to the feed beam 103. The mining or construction machine 100a may include a hydraulic drilling machine 104b1 according to any one of the embodiments disclosed above or below.

[0081] The hydraulic drilling machine 104b1 may be attached to the feeder 104a and thus movable in relation to the feed beam 103. The feed beam 103 may be attached to a second end 101 b of the boom 101 via one or more articulated connections, such as one or more rotators (not shown). The hydraulic drilling machine 104b1 may be moved along the feed beam 103 as the drilling of a drill hole 160a progresses. The drilling machine 104b may comprise and / or hold a drill string 104c and / or a drill bit 104d for drilling a drill hole 160a. It is to be understood that the embodiment of figure 8 is only exemplary, and that the mining or construction machine 100a may carry any kind of tool, such as a bolt installation tool for installation of rock bolts. Other and / or additional tools may also be utilised. The mining or construction machine 100a includes equipment 170a, or means, for the propulsion of the mining or construction machine 100a, which in figure 8 comprises wheels 1 1 1 , 1 13.

[0082] With reference to figure 8, the mining or construction machine 100a may be configured to carry one or more electric battery units 106a for driving the mining or construction machine 100a. The hydraulic drilling machine 104b1 is hydraulically driven and may be power supplied from one or more hydraulic pumps 105, which in turn may be driven by one or more electric motors driven by the one or more electric battery units 106a. The drilling process may be controlled by an operator from a cabin 107 of the mining or construction machine 100a. Alternatively, the mining or construction machine 100a may be remotely controlled or be configured to operate autonomously. The mining or construction machine 100a may further include one or more hydraulic arrangements according to any one of the embodiments disclosed above or below for other hydraulic systems or equipment of the mining or construction machine 100b.

[0083] With reference to figure 8, the feed beam 103 may comprise a first end 103a and a second end 103b. The feed beam 103 may be configured to position the first end 103a of the feed beam 103 between the second end 103b of the feed beam 103 and the rock formation 700b to be penetrated or drilled. For some embodiments, during drilling, the first end 103a of the feed beam 103 may abut, or rest, against the rock formation 700a. For example, the drilling rig 100a may be utilised in tunnelling, surface mining, underground mining, rock reinforcement and raise boring. In general, embodiments of the mining or construction machine 100a include a control arrangement 130a for controlling the mining or construction machine 100a and possibly also for communicating with external systems, as may the mining or construction machines 100b, 100c disclosed in connection with figures 9 and 10 hereinbelow. With reference to figure 9, the mining or construction machine 100b is schematically illustrated as a dump truck 100b, or dumper. The dump truck 100b may, for example, transport fractured rock, or rock material, or any other material used in mining or constructions. The mining or construction machine 100b has equipment 170b, or means, for propulsion. In the embodiment of figure 9, the equipment 170b for propulsion comprises wheels 172b. The mining or construction machine 100b may be configured to carry one or more electric battery units 106b for driving the mining or construction machine 100b. For other embodiments, the mining or construction machine 100b may comprise an internal combustion engine for driving the mining or construction machine 100b. The mining or construction machine 100b may include a hydraulically controlled dump box 178. The mining or construction machine 100b may include one or more hydraulic arrangements according to any one of the embodiments disclosed above or below for the control of the movement of the dump box 178. The mining or construction machine 100b may include a compressor 180 for controlling said one or more fluid streams of the hydraulic arrangement. The mining or construction machine 100b may further include one or more hydraulic arrangements according to any one of the embodiments disclose above or below for other hydraulic systems or equipment of the mining or construction machine 100b.

[0084] With reference to figure 10, another embodiment of the mining or construction machine 100c is schematically illustrated. The mining or construction machine 100c is schematically illustrated as a drilling rig, which also may be referred to as a rock drilling rig. The mining or construction machine 100c may have equipment 206, or means, for propulsion. In the embodiment of figure 10, the equipment 206 for propulsion comprises one or more continuous tracks 208. However, instead of continuous tracks 208, the equipment 206 for propulsion may comprise wheels, or any other means for propulsion. The mining or construction machine 100c may include a feed beam 210. The mining or construction machine 100c may include a hydraulic drilling machine 212 for drilling a drill hole 214 in a rock formation 204 according to any one of the embodiments disclosed above or below. The mining or construction machine 100c may include a compressor 216 for controlling said one or more fluid streams of the hydraulic arrangement. The hydraulic drilling machine 212 may be connected or mounted to the feed beam 210. The hydraulic drilling machine 212 may hold a drill string 202, which is turn is connect to a drill bit 213. For some embodiments, the mining or construction machine 100c may comprise one or more electric battery units for driving and / or operating the mining or construction machine 100c and / or may comprise one or more combustion engines for the same purpose. For example, the mining or construction machine 100c may be utilised in surface mining, underground mining and raise boring. The mining or construction machine 100c may include a cabin 222, from where the drilling process may be controlled by an operator. Alternatively, the mining or construction machine 100c may be remotely controlled or be configured to operate autonomously. It is to be understood that the drilling rig 100c may comprise additional tools and equipment. The mining or construction machine 100c may further include one or more hydraulic arrangements according to any one of the embodiments disclosed above or below for other hydraulic systems or equipment of the mining or construction machine 100c.

[0085] The embodiments disclosed above may be applied to rock breakage under ground or above ground.

[0086] Finally, it should be understood that the invention is not limited to the embodiments described above, but also relates to and incorporates all embodiments within the scope of the appended independent claim.

Claims

Claims1 . A hydraulic arrangement (300a; 300b; 300c; 300d) for performing work by usage of fluid power, wherein the hydraulic arrangement (300a-d) comprises one or more working chambers (302a-c) configured to be alternately evacuated and fed with fluid, one or more channels (304a-c) for guiding one or more fluid streams to and / or from the one or more working chambers (302a-c), and one or more passages (306a-c) having a first fluid port (308a-c) and a second fluid port (310a-c), wherein at least one channel (304a-c) of the one or more channels (304a-c) is connected to one of the one or more working chambers (302a-c) via one of the one or more passages (306a-c), and wherein the size of the second fluid port (310a-c) of the passage (306a-c) exceeds the size of the first fluid port (308a-c) of the same passage (306a-c).

2. A hydraulic arrangement (300a-d) according to claim 1 , wherein at least one channel (304a-c) of the one or more channels (304a-c) is connected to one of the one or more working chambers (302a-c) by one of the one or more passages (306a-c).

3. A hydraulic arrangement (300a-d) according to claim 1 or 2, wherein one of the second fluid port (310a-c) and first fluid port (308a-c) of the passage (306a-c) adjoins the working chamber (302a-c).

4. A hydraulic arrangement (300a-d) according to any one of the claims 1 to 3, wherein the first fluid port (308a-c) of the passage (306a-c) is connected to the working chamber (302a-c) via the second fluid port (310a-c) of the same passage (306a-c).

5. A hydraulic arrangement (300a-d) according to any one of the claims 1 to 4, wherein the cross-section area (A2) of the passage (306a-c) at the second fluid port (31 Oa-c) exceeds the cross-section area (A 1) of the same passage (306a-c) at the first fluid port (308a-c).

6. A hydraulic drilling machine (104b1 ; 212) comprising one or more hydraulic arrangements (300a-d) according to any one of the claims 1 to 5, wherein the hydraulic drilling machine (104b1 ; 212) comprises a fluid-operated piston (322), and wherein two or more of the one or more working chambers (302a-c) are configured to be alternately evacuated and fed with fluid for the fluid-operation of the piston (322).

7. A hydraulic drilling machine (104b1 ; 212) according to claim 6, wherein two of the one or more working chambers (302b-c) comprise a rear working chamber (302b) and a front working chamber (302c), wherein the rear working chamber (302b) and the front working chamber (302c) are configured to be alternately evacuated and fed with fluid for the fluid-operation of the piston (322), wherein one or more channels (304a-c) of the one or more channels (304a-c) is / are connected to one or more of the rear working chamber (302b) and front working chamber (302c) via one or more of the one or more passages (306b-c), and wherein the first fluid port (308b-c) of the passage (306b-c) is connected to one of the rear working chamber (302b) and front working chamber (302c) via the second fluid port (310b-c) of the same passage (306b-c).

8. A hydraulic drilling machine (104b1 ; 212) according to claim 6 or 7, wherein the first fluid port (308a-c) comprises an orifice (312a-b) for one or more of the one or more fluid streams, wherein the second fluid port (310a-c) comprises a mouth (314a-b) for one or more of the one or more fluid streams, and wherein the size of the mouth (314a-b) of the second fluid port (31 Oa-c) exceeds the size of the orifice (312a-b) of the first fluid port (308a-b).

9. A hydraulic drilling machine (104b1 ; 212) according to any one of the claims 6 to 8, wherein the passage (306a-c) is tapered in a direction (316) from the second fluid port (31 Oa-c) to the first fluid port (308a-c).

10. A hydraulic drilling machine (104b1 ; 212) according to any one of the claims 6 to9, wherein the passage (306a-c) is flared in a direction (318) from the first fluid port (308a-c) to the second fluid port (310a-c).1 1. A hydraulic drilling machine (104b1 ; 212) according to any one of the claims 6 to10, wherein the passage (306a-c) is tunneled.

12. A hydraulic drilling machine (104b1 ; 212) according to any one of the claims 6 to1 1 , wherein the passage (312a-c) has an inner surface (320a-c) extending from the first fluid port (308a-c) to the second fluid port (310a-c).

13. A hydraulic drilling machine (104b1 ; 212) according to claim 12, wherein the inner surface (320a-c) of the passage (306a-c) is step-free.

14. A hydraulic drilling machine (104b1 ; 212) according to claim 12 or 13, wherein the inner surface (320a-c) of the passage (306a-c) is smooth.

15. A hydraulic drilling machine (104b1 ; 212) according to any one of the claims 12 to 14, wherein at the second fluid port (306b) the inner surface (320b) of the passage (306b) is curved in a direction (318) away from the first fluid port (308b).

16. A hydraulic drilling machine (104b1 ; 212) according to any one of the claims 12 to 15, wherein at the first fluid port (308b) the inner surface (320b) of the passage (306b) is curved in a direction (316) away from the second fluid port (310b).

17. A hydraulic drilling machine (104b1 ; 212) according to any one of the claims 6 to 16, wherein the hydraulic drilling machine (104b1 ; 212) comprises a casing (324a-c) forming the one or more working chambers (302a-c), the one or more channels (304a- c) and the one or more passages (306a-c).

18. A hydraulic casing (324a-c) comprising one or more hydraulic arrangements (300a-d) according to any one of the claims 1 to 5, wherein the hydraulic casing (324a- c) forms the one or more working chambers (302a-c), the one or more channels (304a- c) and the one or more passages (306a-c).

19. A flushing head (326) comprising one or more hydraulic arrangements (300a-d) according to any one of the claims 1 to 5.

20. A mining or construction machine (100a; 100b; 100c) comprising one or more of the group of:• a compressor (180; 216) for controlling the one or more fluid streams; and• a pump (105) for controlling the one or more fluid streams, and comprising one or more of the group of: • a hydraulic arrangement (300a-d) according to any one of the claims 1 to 5;• a hydraulic drilling machine (104b1 ; 212) according to any one of the claims 6 to 17;• a hydraulic casing (324a-c) according to claim 18; and• a flushing head (326) according to claim 19.

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