Drilling rig

Abstract

The drilling device according to the present invention includes a lower arm having a width that gradually increases from one end to the other end and having a fixing hole on an outer circumferential surface from the other end; a rotating arm base located on the other end of the lower arm, formed in a disk shape, and rotatably fixed to the lower arm; an upper arm located on the rotating arm base, fixed to the rotating arm base, and having a guide hole on an outer circumferential surface on the rotating arm base; a center joint surrounded by the lower arm, the rotating arm base, and the upper arm, and exposed to the outside through the fixing hole of the lower arm and the guide hole of the upper arm; and a slip ring that is inserted into the center joint through the guide hole of the upper arm or separated from the center joint.

Description

[Technical field]

[0001] The present invention relates to an excavator having a bucket, a lower arm, a rotating arm base, an upper arm and a boom which are sequentially arranged toward a driver's seat at a work site and rotatably coupled to each other, and a bucket cylinder and an arm cylinder which are located around the lower arm and the boom, respectively, and rotatably coupled to the bucket and the upper arm. [Background technology]

[0002] In general, an excavator is used to improve work efficiency while reducing the number of workers required, even when the load and volume of the work target increases at a construction site, a waste collection site, or a demolition site. For this purpose, a first excavator 160 shown in Fig. 1 is often used to transport wood, stones, and waste concrete at a construction site, a waste collection site, or a demolition site by attaching a bucket 120 and a clamp 140 to an arm 10, 20, 40 having multiple joints, and engaging the clamp 140 with the bucket 120 while a bucket cylinder 90 and a clamp cylinder 130 are moving around the arm 10, 20, 40.

[0003] 1, the bucket 120 is rotatably fixed to one end of the arm 10, 20, 40 of the first excavator 160, and the other end of the arm 10, 20, 40 is rotatably fixed to a boom (not shown) of the first excavator 160. Therefore, the recessed inlet of the bucket 120 opens toward the driver's seat of the first excavator 160 or opens in a direction away from the driver's seat of the first excavator 160 during relative rotation of the arm 10, 20, 40 with respect to the boom.

[0004] Here, the arms 10, 20, 40 are composed of a lower rotating arm 10, a rotating driver 20, and an upper rotating arm 40, which are sequentially stacked to form a column. The rotating driver 20 rotates the lower rotating arm 10 relative to the upper rotating arm 40. In addition, the first excavator 160 includes a link structure 100 and a tilt link 110 between the lower rotating arm 10 and the bucket 120, thereby connecting the bucket 120 to the lower rotating arm 10 via the link structure 100 and the tilt link 110.

[0005] The tilt link 110 is connected to the bucket 120 together with the link structure 100, and rotates the bucket 120 around the end of the lower rotating arm 10. Thus, the rotation of the articulated arm and the rotation of the tilt link 110 are different from the movement of the link structure 100, and the opening direction of the recessed inlet of the bucket 120 can be continuously and freely changed during the relative rotation of the articulated arms 10, 20, 40 with respect to the boom. Meanwhile, the lower rotating arm 10, the rotary driver 20, and the upper rotating arm 40 surround the center joint 60 and the slip ring 80, considering Figs. 2 and 3.

[0006] The center joint 60 has a joint housing 54 and a joint shaft 58 as shown in Figures 2 and 3. The joint shaft 58 rotates relative to the joint housing 54. The joint housing 54 and the joint shaft 58 are exposed to the outside through the first hole 5 of the lower rotating arm 10 and the second hole 35 of the upper rotating arm 40 as shown in Figures 1 and 3. The slip ring 80 has an input end 74 and an output end 78 as shown in Figure 2. The slip ring 80 exposes the input end 74 and the output end 78 to the outside through the first hole 5 of the lower rotating arm 10 and the second hole 35 of the upper rotating arm 40.

[0007] The input end 74 receives power from a first excavator 160, and the output end 78 is connected to an electronic device (e.g., a level, not shown) to supply power from the input end 74 to the electronic device. However, when the output end 78 of the slip ring 80 is inserted into the center joint 60, the upper rotating arm 40 and the center joint 60 form a structure in which it is difficult to directly insert the slip ring 80 into the second hole 35 from the outside, since the width between the upper rotating arm 40 and the joint shaft 60 in the second hole 35 of the upper rotating arm 40 in FIG. 3 is smaller than the diameter of one hydraulic line C.

[0008] Therefore, when the electronic device fails or the input end 74 or the output end of the slip ring 80 is disconnected, the previously used slip ring 80 must be removed from the center joint 60 and a new slip ring 80 must be inserted into the center joint 60, requiring disassembly of the lower rotating arm 10 and the upper rotating arm 40 from the rotary driver 20. Disassembly of the lower rotating arm 10 and the upper rotating arm 40 from the rotary driver 20 is performed by removing the hydraulic lines C from the center joint 60 and repeatedly changing the state of the screw members B connecting the lower rotating arm 10 and the rotary driver 20 from a fastened state to a loosened state.

[0009] Therefore, inserting a new slip ring 80 into the center joint 60 requires a lot of effort from the drilling worker in relation to dismantling the articulated arms 10, 20, 40 and dismantling the center joint 60 from the multiple hydraulic lines C, which delays the work schedule at the drilling site and deteriorates the environment at the drilling site.

[0010] 4 shows a second excavator 1084 having a first bucket 1014, a first bucket cylinder 1044, a first articulated link 1054, and a first boom 1074 around a first arm 1022. The first bucket 1014 is axially connected to an end of the first arm 1022 at one edge. The first arm 1022 is axially connected to a first boom 1074 through a first boom connecting hole 1020, is axially connected to a first arm cylinder (not shown) through a first arm cylinder connecting hole 1021, and is axially connected to a first bucket cylinder 1044.

[0011] The first bucket cylinder 1044 includes a first rod 1031, a first piston (see reference number 1034 in FIG. 6 ) and a first cylinder 1032, the first cylinder 1032 having a first head cover (see reference number 1037 in FIG. 6 ) that connects to a first tube (see reference number 1036 in FIG. 6 ) on the opposite side of the first rod 1031, and a first connecting ring (see reference number 1038 in FIG. 6 ), and a first rod cover (see reference number 1035 in FIG. 6 ) that connects to the first tube near the first rod 1031.

[0012] Here, the first bucket cylinder 1044 is axially connected to the first arm 1022 by inserting a shaft into the first connecting ring. The first articulated link 1054 is axially connected to the first arm 1022 and the first rod 1031 together with the other edge portion of the first bucket 1014. The first bucket 1014 rotates around the first arm 1022 in the same manner as in FIG. 7 via shape deformation of the first articulated link 1054 in response to operation of the first bucket cylinder 1044, and the first arm 1022 rotates around the first boom 1074 in the same manner as in FIG. 7 in response to operation of the first arm cylinder.

[0013] 4, the first bucket cylinder 1044 has a first length L1 between the center of the first connecting ring and an end of the first rod 1031. The first arm 1022 has a second length L2 between the center of the first boom coupling hole 1020 and an end of the first arm 1022. The first arm 1022 is larger in proportion to the length of the first bucket cylinder 1044 to rotate the first bucket 1014 in response to the operation of the first bucket cylinder 1044.

[0014] 4, the second excavator 1084 has an end of the first rod 1031 on an extension line X1 that passes vertically through the first arm cylinder coupling hole 1021. The second excavator 1084 moves the first bucket 1014 only around the first arm 1022.

[0015] 5 shows a third excavator 1088 including a second bucket 1018, a second bucket cylinder 1048, a second articulated link 1058, a rotating arm 1065, and a second boom 1078 around a second arm 1029. The second bucket 1018, the second arm 1029, the second bucket cylinder 1048, the second articulated link 1058, and the second boom 1078 perform functions similar to those of the first bucket 1014, the first arm 1022, the first bucket cylinder 1044, the first articulated link 1054, and the first boom 1074 in FIG.

[0016] In order for the third excavator 1088 to have a different function from the second excavator 1084, the second arm 1029 is subdivided into a second lower arm 1024 and a second upper arm 1028, and the rotating arm table 1065 is located between the second lower arm 1024 and the second upper arm 1028 to rotate the second lower arm 1024 relatively to the second upper arm 1028. Here, the second bucket cylinder 1048 maintains the same structure as the first bucket cylinder 1044.

[0017] 6, the second bucket cylinder 1048 has a second rod 1033, a second piston 1034, and a second cylinder 1039. The second cylinder 1039 has a second rod cover 1035, a second tube 1036, a second head cover 1037, and a second connecting ring 1038. The second bucket cylinder 1048 is formed by shortening the length of the second tube 1036 compared to the length of the first tube of the first bucket cylinder 1044 in order to position the rotating arm base 1065 between the second lower arm 1024 and the second upper arm 1028 while maintaining the length of the first bucket cylinder 1044 similar.

[0018] Therefore, the second bucket cylinder 1048 has a third length L3 between the center of the second connecting ring 1038 and the end of the second rod 1033, the third length L3 being shorter than the first length L1 of the first bucket cylinder 1044. Also, the second arm 1029 is formed by shortening the length of the second arm 1029 compared to the length of the first arm 1022 in accordance with the length of the second bucket cylinder 1044. Therefore, the second arm 1029 has a fourth length L4 between the center of the second boom coupling hole 1026 and the end of the second lower arm 1024, the fourth length L4 being even shorter than the second length L2 of the first arm 1022.

[0019] With the third excavator 1088 corresponding to the third length L3 with respect to the second bucket cylinder 1048 and the fourth length L4 with respect to the second arm 1029 as shown in FIG. 5, during operation of the third excavator 1088, in FIG. 7, the second bucket 1018 performs a first semicircular motion (radius D1) relative to the second lower arm 1024, and the second arm 1029 performs a second semicircular motion (radius D2) relative to the boom 1078 together with the rotating arm base 1065.

[0020] However, since the second bucket 1018 maintains a predetermined small distance 1019 from the ground 1005, the operator of the third excavator 1088 must frequently raise the second arm 1029 in the upward direction M via the boom 1078, out of concern for abnormal contact between the second bucket 1018 and the ground 1005 during operation of the third excavator 1088. Meanwhile, in the third excavator 1088, when the second rod 1033 is exposed minimally from the second rod cover 1035, the end of the second rod 1033 is on an extension line X2 that passes vertically through the second arm cylinder coupling hole 1027, as viewed in FIG. 5 and FIG. 6.

[0021] In addition, the second lower arm 1024 and the rotating arm base 1065 have a center joint 1023 therein, and the center joint 1023 is exposed to the outside through a second slip entrance hole 1025 in the second upper arm 1028. The center joint 1023 and the slip entrance hole 1025 are spaced apart from the extension line X2 in the second upper arm 1028. Considering the shape of the third excavator 1088 in Figs. 5 and 7 as a whole, the third excavator 1088 has many difficulties in further mounting an attachment between the second bucket 1018 and the second lower arm 1024. Summary of the Invention [Problem to be solved by the invention]

[0022] The present invention has been devised to solve the problems of the conventional art, and aims to provide an excavation device suitable for easily inserting a slip ring into the center joint without disassembling the lower arm, the rotating arm base, and the upper arm, while surrounding the center joint with the lower arm, the rotating arm base, and the upper arm.

[0023] In addition, the present invention has been devised to solve the problems of the prior art, and aims to provide an excavation device suitable for increasing the margin of excavation work by applying a rotating arm base to an arm, subdividing the arm based on the rotating arm base, having a lower arm below the rotating arm base and an upper arm above the rotating arm base, and reducing the length of the upper arm along the longitudinal direction of the arm by changing the shape of the upper arm, and reducing the length of the lower arm along the longitudinal direction of the arm by changing the structure of a bucket cylinder rotatably connected to the lower arm. [Means for solving the problem]

[0024] The drilling rig according to the present invention includes a lower arm having a width gradually increasing from one end to the other end and having a fixing hole on an outer circumferential surface from the other end; a rotating arm base located on the other end of the lower arm, formed in a disk shape, and rotatably fixed to the lower arm; an upper arm located on the rotating arm base, fixed to the rotating arm base, and having a guide hole on an outer circumferential surface on the rotating arm base; a center joint surrounded by the lower arm, the rotating arm base, and the upper arm, and exposed to the outside through the fixing hole of the lower arm and the guide hole of the upper arm; and a slip ring inserted into the center joint through the guide hole of the upper arm or separated from the center joint, wherein the upper arm and the center joint have a width of a central space between the upper arm and the center joint based on an uppermost end of the center joint in the guide hole of the upper arm in appearance that is larger than a diameter of two hydraulic lines.

[0025] The rotating arm base may include a lower rotating table and an upper rotating table which are sequentially stacked on the lower arm, and a drive motor unit which rotates the lower rotating table relative to the upper rotating table, and may be connected to the lower arm and the upper arm via the lower rotating table and the upper rotating table, respectively.

[0026] When the lower arm has a seating hole on a surface perpendicular to the longitudinal direction of the lower arm, and the rotating arm base has a lower rotating base and an upper rotating base which are stacked sequentially, and a through hole passing through the central regions of the lower rotating base and the upper rotating base, the center joint may include a joint housing which is inserted into the seating hole of the lower arm and fixed to the lower rotating base of the rotating arm base, and a joint shaft which is inserted into the joint housing and rotates relative to the joint housing, and protrudes toward the upper arm through the through hole of the rotating arm base.

[0027] The slip ring may have a fixed portion located outside the center joint, a rotating portion fitted to the fixed portion and located outside the center joint and rotating relative to the fixed portion, an input end extending from the rotating portion toward one side of the rotating portion, and an output end extending from the rotating portion toward the other side of the rotating portion.

[0028] The center joint may include a joint housing and a joint shaft inserted into the joint housing, and when the slip ring is inserted into the joint housing and the joint shaft while separated from the center joint, the output end of the slip ring may be inserted into the guide hole of the upper arm, pass sequentially through the joint shaft and the joint housing to be exposed to the fixed hole of the lower arm, and then be pulled from the fixed hole of the lower arm toward the outside, the fixed portion and the rotating portion of the slip ring may be partially inserted into the joint shaft while being guided toward the guide hole of the upper arm during the pulling of the output end, and the input end of the slip ring may be guided together with the fixed portion and the rotating portion toward the guide hole of the upper arm during the pulling of the output end, and may extend from the rotating portion toward the outside through the guide hole of the upper arm.

[0029] The center joint may include a joint housing and a joint shaft inserted into the joint housing, and when the slip ring is separated from the joint housing and the joint shaft while coupled to the center joint, the input end of the slip ring may be pulled toward the outside from the guide hole of the upper arm, the fixed portion and the rotating portion of the slip ring may be separated from the joint shaft during pulling of the input end and guided toward the outside from the guide hole of the upper arm, and the output end of the slip ring may pass through the joint housing and the joint shaft sequentially and be separated from the joint shaft during pulling of the input end.

[0030] The excavator further includes a fragment cover on the guide hole of the upper arm, the upper arm having a round peripheral portion on the center joint in the guide hole of the upper arm and a plurality of connecting rings located on the round peripheral portion, the fragment cover having a connecting hole and a screw member that align with the connecting ring of the round peripheral portion, and the fragment cover can be screwed to the upper arm by inserting a screw member into the connecting hole of the fragment bar and the connecting ring of the round peripheral portion.

[0031] The excavator further includes a fragment cover on the guide hole of the upper arm, the upper arm having a round peripheral portion on the center joint in the guide hole of the upper arm and a plurality of fitting grooves located on the round peripheral portion, the fragment cover having a fitting protrusion that aligns with the fitting groove of the round peripheral portion, and the fragment cover can be fitted to the upper arm by inserting the fitting protrusion of the fragment cover into the fitting groove of the round peripheral portion.

[0032] The excavator further includes a debris cover on the guide hole of the upper arm, the upper arm having a round periphery on the center joint at the guide hole of the upper arm and two auxiliary hinges on the round periphery, the debris cover having a main hinge and a hinge pin aligned with the two auxiliary hinges on the round periphery, and the debris cover can be hinged to the upper arm by inserting the hinge pin into the respective auxiliary hinges on the round periphery and the main hinge of the debris cover.

[0033] The excavator further includes a debris cover on the guide hole of the upper arm, the upper arm having a round periphery on the center joint in the guide hole of the upper arm, two auxiliary hinges located in a central region of the round periphery, and two magnets located on both edges of the round periphery, the debris cover having a main hinge and a hinge pin aligned with the two auxiliary hinges of the round periphery, and the debris cover can be attracted to the magnetic force of the individual magnets of the round periphery while being hinged to the upper arm by inserting the hinge pin into the individual auxiliary hinges of the round periphery and the main hinge of the debris cover.

[0034] When the upper arm has a rounded peripheral portion located on the center joint at a guide hole on one side of the upper arm and an angular peripheral portion located on the center joint at a guide hole on the other side of the upper arm, the guide hole of the rounded peripheral portion may open larger on the upper arm between the center joint and the upper arm based on the top end of the center joint than the guide hole of the angular peripheral portion.

[0035] When the upper arm has a rounded peripheral portion located on the center joint at a guide hole on one side of the upper arm and an angular peripheral portion located on the center joint at a guide hole on the other side of the upper arm, the rounded peripheral portion may be located deeper than the angular peripheral portion on the upper arm based on the top end of the center joint and may have the same curvature as a ceiling facing the center joint.

[0036] The excavator may further include a bucket cylinder and a clamp cylinder located on one side and the other side of the lower arm, respectively, and rotatably fixed to the other end of the lower arm, a link structure located at the one end of the lower arm and rotatably fixed to the lower arm and the bucket cylinder, a tilt link located below the link structure and rotatably fixed to the link structure, a bucket rotatably fixed to the tilt link below the tilt link, and a clamp located at the one end of the lower arm and rotatably fixed to the lower arm and the clamp cylinder.

[0037] In addition, the excavator according to the present invention has a bucket, a lower arm, a rotating arm base, an upper arm and a boom which are sequentially arranged toward a driver's seat at a work site and rotatably coupled to each other, and the upper arm has a boom coupling hole portion and an arm cylinder coupling hole portion which are sequentially positioned on the rotating arm base so as to have a bucket cylinder and an arm cylinder which are respectively positioned around the lower arm and the boom and rotatably coupled to the bucket and the upper arm, the lower arm is positioned on a central axis of the upper arm which passes vertically through the arm cylinder coupling hole portion of the upper arm and overlaps with more than half of the length of the lower arm, the upper arm protrudes the boom coupling hole portion further than the rotating arm base from directly above the rotating arm base toward a side of the upper arm, and the bucket cylinder is rotatably attached to the lower arm via both sides of the bucket cylinder.

[0038] When there is a multi-joint link between the bucket, the lower arm, and the bucket cylinder, the lower arm can be axially connected to the bucket and the multi-joint link in sequence along the longitudinal direction of the lower arm immediately adjacent to the central axis of the upper arm.

[0039] The bucket cylinder has a rod, a piston, and a cylinder, and the cylinder has a head cover located directly below the rotating arm base, a tube connected to the head cover, a rod cover connected to the tube on the opposite side of the head cover, and a hanger that rotatably connects the tube to the lower arm, the rod is located inside and outside the tube and is surrounded by the rod cover to move relative to the cylinder, and the piston is located inside the tube and can move together with the rod.

[0040] When the lower arm has a multi-joint link located on both sides thereof and axially connected to the lower arm, the rod can be axially connected to the multi-joint link and minimally exposed from the rod cover around the lower arm, thereby moving away from the central axis of the upper arm together with the multi-joint link, or can be maximally exposed from the rod cover and approaching the central axis of the upper arm together with the multi-joint link.

[0041] When the rod is minimally exposed from the rod cover, the rod, the rod cover, the tube and the head cover can gradually move away from the central axis of the upper arm in the order of the rod, the rod cover, the tube and the head cover.

[0042] When the rod is maximally exposed from the rod cover, the rod, the rod cover, the tube and the head cover can gradually move away from each other in the order of the rod, the rod cover, the tube and the head cover, while positioning the rod on the central axis of the upper arm.

[0043] When the lower arm has brackets on both sides of the tube, the hanger can include a support portion having a cylindrical protrusion that surrounds the tube and extends toward the bracket, and a locking portion that surrounds the protrusion in a curved manner together with the bracket on the bracket and screws into the bracket.

[0044] When the rod is minimally exposed from the rod cover, the multi-joint link has a rotationally connected connection to the bucket, the lower arm, and the bucket cylinder, and the multi-joint link can be axially connected to the lower arm immediately adjacent to the central axis of the upper arm, axially connected to the bucket further away from the central axis of the upper arm than the lower arm, and axially connected to the rod of the bucket cylinder further away from the central axis of the upper arm than the bucket.

[0045] When the rod is maximally exposed from the rod cover, the multi-joint link has a rotationally connected connection to the bucket, the lower arm, and the bucket cylinder, and the multi-joint link is located immediately adjacent to the central axis of the upper arm and on the left and right of the central axis of the upper arm to be axially connected to the lower arm and the rod, and can be axially connected to the bucket at a position farther from the central axis of the upper arm than the lower arm.

[0046] The rotating arm base may have a lower rotating table and an upper rotating table stacked sequentially between the lower arm and the upper arm, the lower rotating table and the upper rotating table being fixed to the lower arm and the upper arm, respectively, and the lower rotating table being rotated relative to the upper rotating table, and a center joint penetrating the lower rotating table and the upper rotating table together with the lower arm, the center joint being located on the central axis of the upper arm.

[0047] When the upper arm has a slip inlet / outlet hole, the boom connection hole, and the arm cylinder connection hole on the lower, middle, and upper sides of the upper arm, and the lower arm and the rotating arm base have a center joint on the central axis of the upper arm, the slip inlet / outlet hole of the upper arm can expose the center joint to the outside on the central axis of the upper arm to induce the connection of a slip to or separation of the slip from the center joint.

[0048] When the upper arm has a slip entrance / exit hole portion, the boom connecting hole portion, and the arm cylinder connecting hole portion on the lower, middle and upper sides of the upper arm, the slip entrance / exit hole portion of the upper arm can be located on the central axis of the upper arm and at the same level as the boom connecting hole portion in a direction perpendicular to the central axis of the upper arm.

[0049] When the upper arm has a slip entrance / exit hole portion, the boom connecting hole portion, and the arm cylinder connecting hole portion on the lower, middle and upper sides of the upper arm, the slip entrance / exit hole portion and the arm cylinder connecting hole portion of the upper arm can be positioned on the central axis of the upper arm.

[0050] When the system has a bucket and a rotating link connected to the lower arm, the bucket cylinder located on one side of the lower arm and connected to the lower arm, a clamp cylinder located on the other side of the lower arm and connected to the lower arm, a clamp located at an end of the lower arm and connected to the lower arm, and a multi-joint link connected to the lower arm, the bucket and the rotating link, and the bucket cylinder, the bucket and the rotating link rotate around the central axis of the upper arm by extending and contracting the multi-joint link in response to operation of the bucket cylinder, and the clamp is axially connected to the lower arm near the central axis of the upper arm, and can move relative to the lower arm in response to operation of the clamp cylinder to rotate up and down. Effect of the Invention

[0051] The drilling rig according to the invention comprises: The present invention provides a multi-joint arm having a lower arm, a rotating arm base, and an upper arm which are sequentially stacked to form a multi-joint arm, a fixing hole located in the lower arm directly below the rotating arm base, a guide hole located in the upper arm directly above the rotating arm base, and a center joint inserted into the lower arm, the rotating arm base, and the upper arm, The joint housing of the center joint is exposed in the fixing hole of the lower arm, and the joint shaft of the center joint is exposed in the guide hole of the upper arm. The width of the central space between the joint shaft and the upper arm based on the top end of the center joint in the guide hole of the upper arm is larger than the diameters of the two hydraulic lines. While the center joint is surrounded by the lower arm, the rotating arm base, and the upper arm, the slip ring can be easily inserted into the center joint without disassembling the lower arm, the rotating arm base, and the upper arm.

[0052] The drilling rig according to the invention comprises: A rotating arm base is applied to the arm, and the arm is divided based on the rotating arm base, and then a lower arm is provided below the rotating arm base and an upper arm is provided above the rotating arm base; reducing the profile of the upper arm toward the swivel arm base along the arm's longitudinal direction while making the upper arm larger than the swivel arm base in a direction perpendicular to the arm's longitudinal direction; The connecting ring is removed from the bucket cylinder, and the tube is rotatably coupled to the lower arm base via the outer circumferential surface of the tube. The rotation of the bucket due to the minimum and maximum exposed lengths of the rod from the rod cover of the cylinder around the lower arm is appropriately reflected, The shape of the upper arm can be changed to reduce the length of the upper arm along the longitudinal direction of the arm, and the structure of the bucket cylinder that is rotatably connected to the lower arm can be changed to reduce the length of the lower arm along the longitudinal direction of the arm, thereby increasing the margin of error during excavation work. [Brief description of the drawings]

[0053] [Figure 1] FIG. 1 is a partial side view of a first excavator according to the prior art. [Diagram 2] 2 is an image showing a connection relationship between a center joint and a slip ring in the first excavator of FIG. 1. [Diagram 3] 2 is an image showing a lower rotating arm, a rotating driver, and a center joint (slip ring not shown) located on an upper rotating arm in the first excavator of FIG. 1. [Figure 4] FIG. 1 is a side view showing a second excavator according to an embodiment of the prior art. [Diagram 5] FIG. 11 is a side view showing a third excavator according to another embodiment of the prior art. [Figure 6] FIG. 6 is a side view showing a schematic view of a bucket cylinder in the third excavator of FIG. 5. [Figure 7] FIG. 6 is a schematic diagram showing the operation of the third excavator of FIG. 5; [Figure 8] FIG. 2 is a partial side view of a first drilling device according to the present invention. [Figure 9] FIG. 9 is an exploded perspective view partially showing the first drilling device of FIG. 8. [Figure 10] 9 is an image showing an enlarged view of the lower arm, the drive motor unit, and the center joint located on the upper arm in the first excavation device in FIG. 8 . [Figure 11] 11 is an image showing the positional relationship between the upper arm and the center joint in FIG. 10. [Figure 12] 12 is an image showing the fragment cover located on the upper arm of FIG. 11. [Figure 13] 13 is a first modification to the upper arm and fragment cover of FIG. [Figure 14] 13 is a second variation on the upper arm and fragment cover of FIG. [Figure 15] 13 is a third variation of the upper arm and fragment cover of FIG. [Figure 16] FIG. 2 is a side view showing a second drilling device according to the present invention. [Figure 17]FIG. 17 is a partially enlarged side view of the second excavation device of FIG. 16. [Figure 18] FIG. 17 is a partially enlarged perspective view of the second excavation device of FIG. 16. [Figure 19] FIG. 19 is a partially enlarged perspective view of the bucket cylinder of FIG. 18. [Figure 20] FIG. 20 is a schematic diagram showing a rod that is maximally exposed from the cylinder in the bucket cylinder of FIG. 19. [Figure 21] FIG. 20 is a schematic diagram showing the rods in the bucket cylinder of FIG. 19 that are minimally exposed from the cylinder. [Figure 22] FIG. 17 is a side view showing a rotating link, a clamp, and a clamp cylinder further attached to the second excavation device of FIG. 16. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0054] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to enable those skilled in the art to easily carry out the present invention.

[0055] FIG. 8 is a side view partially showing a first drilling device according to the present invention, FIG. 9 is an exploded oblique view partially showing the first drilling device of FIG. 8, and FIG. 10 is an image showing an enlarged view of the lower arm, the drive motor unit, and the center joint located on the upper arm in the first drilling device of FIG. 8 by region.

[0056] FIG. 11 is an image showing the positional relationship between the upper arm and the center joint in FIG. 10, and FIG. 12 is an image showing the fragment cover positioned on the upper arm in FIG.

[0057] Here, Figures 8 to 12, together with the following Figures 13 to 15, show an improved configuration of the first excavator of Figures 1 to 3.

[0058] 8 to 12, the first drilling device 410 according to the present invention includes a lower arm 210, a rotating arm base 230, an upper arm 250, a center joint 270, and a slip ring 289 in Fig. 8. Schematically, the lower arm 210 has a width that gradually increases from one end to the other end in Figs. 8 to 10, and has a fixing hole 208 on the outer circumferential surface on the other end.

[0059] 8 to 10, the rotating arm base 230 is formed in a disk shape, located on the other end of the lower arm 210, and is rotatably fixed to the lower arm 210. The upper arm 250 is located on the rotating arm base 230, and is fixed to the rotating arm base 230, and has a guide hole 244 on the outer circumferential surface on the rotating arm base 230, in FIG.

[0060] 8 to 10, the center joint 270 is surrounded by the lower arm 210, the rotating arm base 230 and the upper arm 250, and is exposed to the outside through the fixing hole 208 of the lower arm 210 and the guide hole 244 of the upper arm 250. Considering FIG. 10, the slip ring 289 is directly inserted into the center joint 270 from the outside through the guide hole 244 of the upper arm 250, or is directly separated from the center joint 270 toward the outside.

[0061] The center joint 270 and the slip ring 289 have the same shapes as the center joint 60 and the slip ring 80 in Fig. 2. Here, the upper arm 250 and the center joint 270 have a width of a central space between the upper arm 250 and the center joint 270 based on the top end of the center joint 270 in the guide hole 244 of the upper arm 250 that is larger than the diameter of two hydraulic lines E in appearance in Figs.

[0062] Explaining in more detail, in Figures 8 to 10, the rotating arm base 230 has a lower rotating base 223 and an upper rotating base 226 which are stacked sequentially on the lower arm 210, and a drive motor unit 229 which rotates the lower rotating base 223 relative to the upper rotating base 226, and is connected to the lower arm 210 and the upper arm 250 via the lower rotating base 223 and the upper rotating base 226, respectively.

[0063] 9, the lower arm 210 has a seating hole 204 on a surface perpendicular to the longitudinal direction of the lower arm 210, and the rotating arm base 230 has a lower rotating base 223 and an upper rotating base 226 stacked in sequence, as shown in FIG. 9, and a through hole 225 passing through the central regions of the lower rotating base 223 and the upper rotating base 226, as shown in FIG. 9, the center joint 270 includes a joint housing 264 and a joint shaft 268, as shown in FIGS. 8 to 10.

[0064] 9 and 10, the joint housing 264 is inserted into the seating hole 204 of the lower arm 210 and fixed to the lower rotating base 223 of the rotating arm base 230. The joint shaft 268 is inserted into the joint housing 264 and rotates relatively to the joint housing 264, and protrudes toward the upper arm 250 through the through hole 225 of the rotating arm base 230, as viewed in FIG.

[0065] 9 to 11, the slip ring 289 has a fixed portion 282 located outside the center joint 270, a rotating portion 284 that is fitted into the fixed portion 282 and located outside the center joint 270, and rotates relative to the fixed portion 282, an input end 286 that starts from the rotating portion 284 and extends toward one side of the rotating portion 284, and an output end 288 that starts from the rotating portion 284 and extends toward the other side of the rotating portion 284.

[0066] 9 and 10, the center joint 270 has a joint housing 264 and a joint shaft 268 inserted into the joint housing 264. When the slip ring 289 is inserted into the joint housing 264 and the joint shaft 268 in a state separated from the center joint 270 in FIG. 9 and FIG. 10, the output end 288 of the slip ring 289 is inserted into the guide hole 244 of the upper arm 250, passes through the joint shaft 268 and the joint housing 264 in that order, is exposed to the fixing hole 208 of the lower arm 210, and is then pulled outward from the fixing hole 208 of the lower arm 210, as shown in FIG. 9 to FIG. 11.

[0067] 9 to 11, the fixed part 282 and the rotating part 284 of the slip ring 289 are guided toward the guide hole 244 of the upper arm 250 during pulling of the output end 288, and are partially inserted into the joint shaft 268. The input end 286 of the slip ring 289, together with the fixed part 282 and the rotating part 284, is guided toward the guide hole 244 of the upper arm 250 during pulling of the output end 288, and extends from the rotating part 284 to the outside through the guide hole 244 of the upper arm 250, as shown in FIG.

[0068] In contrast, the center joint 270 has a joint housing 264 and a joint shaft 268 inserted into the joint housing 264 in Figures 9 and 10, and when the slip ring 289 is separated from the joint housing 264 and the joint shaft 268 while being coupled to the center joint 270 in Figures 9 and 10, the input end 286 of the slip ring 289 is pulled outward from the guide hole 244 of the upper arm 250 in Figures 9 to 11.

[0069] 9 to 11, the fixed part 282 and the rotating part 284 of the slip ring 289 are separated from the joint shaft 268 during pulling of the input end 286 and guided to the outside through the guide hole 244 of the upper arm 250. The output end 288 of the slip ring 289 passes through the joint housing 264 and the joint shaft 268 in sequence during pulling of the input end 286, and is separated from the joint shaft 268.

[0070] 11 and 12, the first excavation device 410 further includes a fragment cover 300 on the guide hole 244 of the upper arm 250. Here, the upper arm 250 has a round peripheral portion R on the center joint 270 of the guide hole 244 of the upper arm 250 in Figs. 10 and 11, and a plurality of coupling rings 242 located on the round peripheral portion R. Considering Figs. 10 to 12, the fragment cover 300 has a coupling hole 294 and a screw member 298 aligned with the coupling ring 242 of the round peripheral portion R, and is screwed to the upper arm 250 by inserting the screw member 298 into the coupling hole 294 of the fragment cover 300 and the coupling ring 242 of the round peripheral portion R.

[0071] When the upper arm 250 has a rounded peripheral portion R located on the center joint 270 of the guide hole 244 on one side of the upper arm 250 and an angular peripheral portion S located on the center joint 270 of the guide hole 248 on the other side of the upper arm 250, the guide hole 244 of the rounded peripheral portion R opens further into the upper arm 250 than the guide hole 248 of the angular peripheral portion S between the center joint 270 and the upper arm 250 based on the top end of the center joint 270, when considering Figures 8, 10 and 11.

[0072] In addition, when the upper arm 250 has a rounded peripheral portion R located on the center joint 270 in the guide hole 244 on one side of the upper arm 250, and an angular peripheral portion S located on the center joint 270 in the guide hole 248 on the other side of the upper arm 250, taking into consideration Figures 8, 10 and 11, the rounded peripheral portion R is located deeper than the angular peripheral portion S in the upper arm 250 based on the top end of the center joint 270, and has the same curvature as the ceiling facing the center joint 270.

[0073] 8, the first excavator 410 has a bucket cylinder 350, a link structure 360, a tilt link 370, a bucket 380, a clamp cylinder 390, and a clamp 400. The bucket cylinder 350 and the clamp cylinder 390 are respectively located on one side and the other side of the lower arm 210 and are rotatably fixed to the other end of the lower arm 210. The link structure 360 ​​is located at one end of the lower arm 210 and is rotatably fixed to the lower arm 210 and the bucket cylinder 350.

[0074] In addition, the tilt link 370 is located below the link structure 360 ​​and is rotatably fixed to the link structure 360. The bucket 380 is rotatably fixed to the tilt link 370 below the tilt link 370. The clamp 400 is located at one end of the lower arm 210 and is rotatably fixed to the lower arm 210 and a clamp cylinder 390.

[0075] FIG. 13 is a first variation on the upper arm and fragment cover of FIG.

[0076] 13, the upper arm 253 and the fragment cover 320 according to the first modified example of the present invention have a different structure from the upper arm 250 and the fragment cover 300 in FIGS. 10 to 12. More specifically, the first excavation device 410 further includes a fragment cover 320 on the guide hole 249 of the upper arm 253.

[0077] 11 and 13, the upper arm 253 has a round peripheral portion R on the center joint 270 of the guide hole 249 of the upper arm 253, and a plurality of fitting grooves 244 located on the round peripheral portion R. The fragment cover 320 has a fitting protrusion 315 aligned with the fitting groove 244 of the round peripheral portion R in FIG. 9, and is fitted to the upper arm 253 by inserting the fitting protrusion 315 of the fragment cover 320 into the fitting groove 244 of the round peripheral portion R.

[0078] FIG. 14 is a second variation on the upper arm and fragment cover of FIG.

[0079] 14, the upper arm 256 and the fragment cover 340 according to the second modified example of the present invention have a different structure from the upper arm 250 and the fragment cover 300 of FIGS. 10 to 12. More specifically, the first excavation device 410 further includes a fragment cover 340 on the guide hole 249 of the upper arm 256.

[0080] 11 and 14, the upper arm 256 has a round periphery R on a center joint 270 in a guide hole 249 of the upper arm 256, and has two auxiliary hinges 246 on the round periphery R. The fragment cover 340 has a main hinge 334 and a hinge pin 338 aligned with the two auxiliary hinges 246 of the round periphery R in FIG. 14, and is hinged to the upper arm 256 by inserting the hinge pin 338 into the individual auxiliary hinges 246 of the round periphery R and the main hinge 334 of the fragment cover 340.

[0081] That is, the fragment cover 340 is hinged to the upper arm 256 and is fixed to the upper arm 256 in a rotatable manner (R1).

[0082] FIG. 15 is a third variation on the upper arm and fragment cover of FIG.

[0083] 15, an upper arm 259 and a fragment cover 340 according to the third modified example of the present invention have a different structure from the upper arm 250 and the fragment cover 300 of FIGS. 10 to 12. More specifically, the first excavation device 410 further includes a fragment cover 340 on the guide hole 249 of the upper arm 259.

[0084] 11 and 15, the upper arm 259 has a round peripheral portion R located on a center joint 270 in a guide hole 249 of the upper arm 259, two auxiliary hinges 246 located in a central region of the round peripheral portion R, and two magnets 247 located on both edges of the round peripheral portion R. The fragment cover 340 has a main hinge 334 and a hinge pin 338 aligned with the two auxiliary hinges 246 of the round peripheral portion R in FIG. 15, and is hinged to the upper arm 259 by inserting the hinge pin 338 into the individual auxiliary hinge 246 of the round peripheral portion R and the main hinge 334 of the fragment cover 340, and is attracted by the magnetic force of the individual magnet 247 of the round peripheral portion R.

[0085] That is, the fragment cover 340 is hinged to the upper arm 259 and fixed to the upper arm 259 in a rotatable manner (R2).

[0086] Figure 16 is a side view showing a second drilling device according to the present invention, Figure 17 is a side view showing a partially enlarged view of the second drilling device of Figure 16, and Figure 18 is a perspective view showing a partially enlarged view of the second drilling device of Figure 16.

[0087] FIG. 19 is a partially enlarged perspective view of the bucket cylinder of FIG. 18, and FIG. 20 is a schematic view showing a rod that is maximally exposed from the bucket cylinder of FIG.

[0088] 21 is a schematic diagram showing a rod that is minimally exposed from the bucket cylinder of FIG. 19, and FIG. 22 is a side view showing a rotating link, a clamp, and a clamp cylinder that are further attached to the second excavation device of FIG. 16.

[0089] Here, Figs. 16 to 22 show configurations that improve the second and third excavators of Figs. 4 to 7.

[0090] 16 to 22, the second excavation device 1210 according to the present invention has a bucket 1095, a lower arm 1103, a rotating arm base 1189, an upper arm 1108 and a boom 1195 which are arranged sequentially toward the driver's seat at the work site and rotatably connected to each other, and has a bucket cylinder 1160 and an arm cylinder (not shown) which are located around the lower arm 1103 and the boom 1195, respectively, and rotatably connected to the bucket 1095 and the upper arm 1108.

[0091] Generally speaking, when the upper arm 1108 has a boom connecting hole portion 1105 and an arm cylinder connecting hole portion 1106 which are positioned sequentially on the rotating arm base 1189 in Figures 16 and 17, the lower arm 1103 is positioned on the central axis of the upper arm 1108 which passes vertically through the arm cylinder connecting hole portion 1106 of the upper arm 1108 and overlaps more than half the length of the lower arm 1103 in Figure 16.

[0092] 17, the upper arm 1108 has a boom coupling hole portion 1105 protruding further than the rotating arm base 1189 toward the side of the upper arm 1108 directly above the rotating arm base 1189. The bucket cylinder 1160 is rotatably attached to the lower arm 1103 via both side portions of the bucket cylinder 1160 in FIGS.

[0093] More specifically, when the second excavation device 1210 has an articulated link 1175 between the bucket 1095, the lower arm 1103, and the bucket cylinder 1160 as shown in FIG. 16, the lower arm 1103 is axially connected to the bucket 1095 and the articulated link 1175 sequentially along the longitudinal direction of the lower arm 1103 immediately adjacent to the central axis X3 of the upper arm 1108 in FIG. 16.

[0094] 16 to 21, the bucket cylinder 1160 has a rod 1115, a piston 1126, and a cylinder 1155. In FIGS. 16 to 21, the cylinder 1155 has a head cover 1139 located directly below the rotating arm base 1189, a tube 1133 connected to the head cover 1139, a rod cover 1136 connected to the tube 1133 on the opposite side of the head cover 1139, and a hanger 1149 that rotatably connects the tube 1133 to the lower arm 1103.

[0095] 16 to 21, the rod 1115 is located inside and outside the tube 1133, is surrounded by a rod cover 1136, and moves relatively to the cylinder 1155. The piston 1126 is located inside the tube 1133 and moves together with the rod 1115 in FIGS. 20 and 21. Here, the bucket cylinder 1160 does not have the second connecting ring 1038 of the second cylinder 1039 disclosed in FIG. 6.

[0096] 20 and 21, the cylinder 1155 manages the uniform and decelerated motion of the piston 1126. Specifically, the uniform motion of the piston 1126 is limited by the size of the tube 1133.

[0097] In addition, the deceleration motion of the piston 1126 is limited by a first adjusting screw 1135 exposed to the first flow path P1 in the rod cover 1136 and a first cushion ring 1123 extending from the piston 1126 to the rod cover 1136, and by a second adjusting screw 1138 exposed to the second flow path P2 in the head cover 1139 and a second cushion ring 1129 extending from the piston 1126 to the head cover 1139.

[0098] When the second drilling device 1210 has a multi-joint link 1175 located on both sides of the lower arm 1103 and axially connected to the lower arm 1103 as shown in Figures 16 and 18, the rod 1115 is axially connected to the multi-joint link 1175 as shown in Figures 16 and 18, and moves away from the central axis X3 of the upper arm 2108 together with the multi-joint link 1175 by being minimally exposed from the rod cover 1136 around the lower arm 1103 in Figure 21, or moves closer to the central axis X3 of the upper arm 1108 together with the multi-joint link 1175 by being maximally exposed from the rod cover 1136 in Figure 20.

[0099] As shown in FIG. 21, when the rod 1115 is minimally exposed from the rod cover 1136, the rod 1115, rod cover 1136, tube 1133, and head cover 1139 gradually move away from the central axis X3 of the upper arm 1108 in the order of rod 1115, rod cover 1136, tube 1133, and head cover 1139 in FIG. 16 and FIG. 21.

[0100] As shown in FIG. 20, when the rod 1115 is maximally exposed from the rod cover 1136, the rod 1115, rod cover 1136, tube 1133, and head cover 1139 gradually move away from each other in the order of rod 1115, rod cover 1136, tube 1133, and head cover 1139, while positioning the rod 1115 on the central axis X3 of the upper arm 1108, taking into consideration FIG. 20 and FIG. 22.

[0101] 21, when the rod 1115 is minimally exposed from the rod cover 1136, the rod 1115 moves from the rod cover 1136 toward the head cover 1139 along one direction M2. When the rod 1115 is maximally exposed from the rod cover 1136, the rod 1115 moves from the head cover 1139 toward the rod cover 1136 along the other direction M1.

[0102] As shown in FIG. 18, when the lower arm 1103 has brackets 1141 on both sides of the tube 1133, the hanger 1149, in FIGS. 18 to 21, includes a support portion 1143 having a cylindrical protrusion piece 1142 extending toward bracket B while surrounding the tube 1133, and a lock portion 1146 that surrounds the protrusion piece 1142 in a bent shape together with bracket B on bracket B and is screwed into bracket 1141.

[0103] As shown in Fig. 21, when the rod 1115 is minimally exposed from the rod cover 1136, the second excavation device 1210 has an articulated link 1175 that is rotationally coupled to the bucket 1095, the lower arm 1103, and the bucket cylinder 1160 in Fig. 16 and Fig. 18. The articulated link 1175 is axially coupled to the lower arm 1103 immediately adjacent to the central axis X3 of the upper arm 1108 in Fig. 16.

[0104] In addition, in FIG. 16 , the articulated link 1175 is axially connected to the bucket 1095 at a position farther from the central axis X3 of the upper arm 1108 than the lower arm 1103, and is axially connected to the rod 1115 of the bucket cylinder 1160 at a position farther from the central axis X3 of the upper arm 1108 than the bucket 1095.

[0105] In contrast, considering Figures 20 and 22, when the rod 1115 is maximally exposed from the rod cover 1136, the second drilling device 1210 has an articulated link 1175 that is rotatably connected to the bucket 1095, the lower arm 1103 and the bucket cylinder 1160 in Figures 16 and 18.

[0106] Considering Figure 22, the articulated link 1175 is located immediately adjacent to the central axis X3 of the upper arm 1108, on the left and right sides of the central axis X3 of the upper arm 1108, and is axially connected to the lower arm 1103 and the rod 1115, and is axially connected to the bucket 1095 at a position farther away from the central axis X3 of the upper arm 1108 than the lower arm 1103.

[0107] In Figures 16 and 17, the rotating arm base 1189 has a lower rotating base 1183 and an upper rotating base 1186 which are stacked in sequence between the lower arm 1103 and the upper arm 1108, and the lower rotating base 1183 and the upper rotating base 1186 are fixed to the lower arm 1103 and the upper arm 1108, respectively.

[0108] 16 and 17, the rotating arm base 1189 rotates the lower rotating base 1183 relatively to the upper rotating base 1186, and has a center joint 1102 that penetrates the lower rotating base 1183 and the upper rotating base 1186 together with the lower arm 1103. The center joint 1102 is located on the central axis X3 of the upper arm 1108 in FIG.

[0109] When the upper arm 1108 has a slip inlet / outlet hole 1104, a boom connecting hole 1105, and an arm cylinder connecting hole 1106 on the lower, middle and upper sides of the upper arm 1108 in Figures 16 and 17, and the lower arm 1103 and the rotating arm base 1189 have a center joint 1102 on the central axis X3 of the upper arm 1108 in Figures 16 and 17, the slip inlet / outlet hole 1104 of the upper arm 1108 exposes the center joint 1102 to the outside on the central axis X3 of the upper arm 1108, thereby inducing the connection of a slip (not shown) to the center joint 1102 or the separation of the slip from the center joint 1102.

[0110] Here, the center joint 1102 rotates freely with respect to the rotation of the rotating arm base 1189 while being connected to a hydraulic line, and the slip has an electric wire and rotates freely with respect to the rotation of the center joint 1102. That is, the slip prevents twisting of the electric wire when the sensor joint 1102 rotates. The upper arm 1108 has a plug 1107 to minimize the inflow of foreign matter through the slip inlet / outlet hole 1104.

[0111] When the upper arm 1108 has a slip in / out hole portion 1104, a boom connecting hole portion 1105, and an arm cylinder connecting hole portion 1106 on the lower, middle and upper sides of the upper arm 1108, as in Figures 16 and 17, the slip in / out hole portion 1104 of the upper arm 1108 is located on the central axis X3 of the upper arm 1108 in Figures 16 and 17 and is located at the same level as the boom connecting hole portion 1105 in a direction perpendicular to the central axis X3 of the upper arm 1108.

[0112] When the upper arm 1108 has a slip entrance / exit hole portion 1104, a boom connecting hole portion 1105, and an arm cylinder connecting hole portion 1106 on the lower, middle and upper sides of the upper arm 1108, as in Figures 16 and 17, the slip entrance / exit hole portion 1104 and the arm cylinder connecting hole portion 1106 of the upper arm 1108 are positioned on the central axis X3 of the upper arm 1108 in Figures 16 and 17.

[0113] On the other hand, when the second excavation device 1210 has, as shown in FIG. 22 , a bucket 1095 and a rotating link 1225 connected to the lower arm 1103, a bucket cylinder 1160 located on one side of the lower arm 1103 and connected to the lower arm 1103, a clamp cylinder 1234 located on the other side of the lower arm 1103 and connected to the lower arm 1103, a clamp 1238 located at an end of the lower arm 1103 and connected to the lower arm 1103, and a multi-joint link 1175 connected to the lower arm 1103, the rotating link 1225, and the bucket cylinder 1160, the bucket 1095 and the rotating link 1225 rotate around the central axis X3 of the upper arm 1108 by extending and contracting the multi-joint link 1175 in response to the operation of the bucket cylinder 1160 in FIG. 22 .

[0114] 22, the clamp 1238 is axially coupled to the lower arm 1103 near the central axis X3 of the upper arm 1108, and moves relatively to the lower arm 1103 in response to the operation of the clamp cylinder 1234, rotating up and down.

Claims

1. a lower arm having a width that gradually increases from one end to the other end and a fixing hole on an outer circumferential surface of the lower arm from the other end; a rotating arm base that is formed in a disk shape and is located on the other end of the lower arm and is rotatably fixed to the lower arm; an upper arm located on the rotating arm base and fixed to the rotating arm base, the upper arm having a guide hole on an outer circumferential surface on the rotating arm base; a center joint surrounded by the lower arm, the rotating arm base, and the upper arm, and exposed to the outside through the fixing hole of the lower arm and the guide hole of the upper arm; a slip ring that is inserted into the center joint through the guide hole of the upper arm or separated from the center joint; The upper arm and the center joint are In appearance, the width of a central space between the upper arm and the center joint based on the uppermost end of the center joint in the guide hole of the upper arm is larger than the diameters of two hydraulic lines.

2. The rotating arm base is a lower rotating platform and an upper rotating platform which are stacked in sequence on the lower arm; and a drive motor unit which rotates the lower rotating platform relative to the upper rotating platform, The excavation rig according to claim 1 , wherein the lower arm and the upper arm are coupled to each other via the lower rotating platform and the upper rotating platform, respectively.

3. The lower arm, A seat hole is provided on a surface perpendicular to the longitudinal direction of the lower arm, The rotating arm base is When a lower rotating platform and an upper rotating platform are sequentially stacked, and a through hole is provided through a central region of the lower rotating platform and the upper rotating platform, The center joint is a joint housing inserted into a seat hole of the lower arm and fixed to the lower rotating base of the rotating arm base; The drilling rig according to claim 1 , further comprising: a joint shaft that is inserted into the joint housing and rotates relative to the joint housing, and that protrudes toward the upper arm through the through hole of the rotating arm base.

4. The slip ring is 2. The drilling rig according to claim 1, comprising: a fixed portion located outside the center joint; a rotating portion fitted to the fixed portion and located outside the center joint, and rotating relatively to the fixed portion; an input end starting from the rotating portion and extending toward one side of the rotating portion; and an output end starting from the rotating portion and extending toward the other side of the rotating portion.

5. The center joint is A joint housing and a joint shaft inserted into the joint housing, The slip ring is When the joint shaft is inserted into the joint housing while separated from the center joint, The output end of the slip ring is the upper arm is inserted into the guide hole, passes through the joint shaft and the joint housing, is exposed to the fixing hole of the lower arm, and is then pulled outward from the fixing hole of the lower arm; The fixed portion and the rotating portion of the slip ring are The output end is partially inserted into the joint shaft while being guided toward the guide hole of the upper arm during pulling of the output end; The input end of the slip ring is The drilling device according to claim 4, wherein the output end starts from the rotating part and extends towards the outside through the guide hole of the upper arm while being guided towards the guide hole of the upper arm together with the fixed part and the rotating part during pulling of the output end.

6. The center joint is A joint housing and a joint shaft inserted into the joint housing, The slip ring is When the joint housing and the joint shaft are separated from the center joint while being coupled to the center joint, The input end of the slip ring is The upper arm is pulled outward from the guide hole toward the outside, The fixed portion and the rotating portion of the slip ring are During the pulling of the input end, the input end is separated from the joint shaft and guided toward the outside through the guide hole of the upper arm, The output end of the slip ring is 5. The drilling rig of claim 4, wherein during tensioning of the input end, the input end passes sequentially through the joint housing and the joint shaft and away from the joint shaft.

7. further comprising a fragment cover over the guide hole of the upper arm; The upper arm is The guide hole of the upper arm has a round periphery on the center joint, and a plurality of connecting rings located on the round periphery; The fragment cover includes: a coupling hole and a threaded member that align with the coupling ring of the rounded periphery; The excavation equipment according to claim 1 , wherein a screw member is inserted into the coupling hole of the fragment bar and the coupling ring of the round periphery to be screwed to the upper arm.

8. further comprising a fragment cover over the guide hole of the upper arm; The upper arm is The guide hole of the upper arm has a rounded peripheral portion on the center joint, and a plurality of fitting grooves are located on the rounded peripheral portion; The fragment cover includes: a fitting protrusion aligned with the fitting groove of the rounded periphery; The excavation device according to claim 1 , wherein the fragment cover is fitted to the upper arm by inserting the fitting protrusion of the fragment cover into the fitting groove of the round peripheral portion.

9. further comprising a fragment cover over the guide hole of the upper arm; The upper arm is The upper arm has a round periphery on the center joint in the guide hole, and two auxiliary hinges on the round periphery; The fragment cover includes: a primary hinge and a hinge pin aligned with the two secondary hinges on the rounded periphery; 2. The drilling rig of claim 1, wherein the round perimeter individual secondary hinges and the fragment cover main hinges are hinged to the upper arm by inserting the hinge pins into the hinges.

10. further comprising a fragment cover over the guide hole of the upper arm; The upper arm is The upper arm has a rounded periphery on the center joint of the guide hole, two auxiliary hinges located in a central area of ​​the rounded periphery, and two magnets located on both edges of the rounded periphery; The fragment cover includes: a primary hinge and a hinge pin aligned with the two secondary hinges on the rounded periphery; 2. The drilling rig according to claim 1, wherein the hinge pin is inserted into the individual auxiliary hinges of the round periphery and the main hinge of the fragment cover to be hinged to the upper arm and attracted by the magnetic force of the individual magnets of the round periphery.

11. The upper arm is The upper arm has a rounded periphery located on the center joint of the guide hole on one side thereof, The upper arm has an angular periphery located on the center joint of the guide hole on the other side thereof, The guide holes of the rounded periphery are 2. The excavation device according to claim 1, wherein the guide hole is larger in the upper arm than the guide hole in the angular peripheral portion between the center joint and the upper arm, based on the uppermost end of the center joint.

12. The upper arm is The upper arm has a rounded periphery located on the center joint of the guide hole on one side thereof, The upper arm has an angular periphery located on the center joint of the guide hole on the other side thereof, The rounded periphery is 2. The drilling rig of claim 1, wherein the uppermost end of the center joint is located deeper in the upper arm than the angular peripheral portion and has the same curvature as a ceiling facing the center joint.

13. a bucket cylinder and a clamp cylinder located on one side and the other side of the lower arm, respectively, and rotatably fixed to the other end of the lower arm; a link structure located at the one end of the lower arm and rotatably fixed to the lower arm and the bucket cylinder; a tilt link located below the link structure and rotatably fixed to the link structure; a bucket below the tilt link and rotationally fixed to the tilt link; and The drilling rig of claim 1 , further comprising a clamp located at the one end of the lower arm and rotatably fixed to the lower arm and the clamp cylinder.

14. An excavation device comprising a bucket, a lower arm, a rotating arm base, an upper arm and a boom which are sequentially arranged toward a driver's seat at a work site and are rotatably coupled to one another, and a bucket cylinder and an arm cylinder which are respectively positioned around the lower arm and the boom and are rotatably coupled to the bucket and the upper arm, The upper arm is When the boom connecting hole portion and the arm cylinder connecting hole portion are located on the rotating arm base in sequence, The lower arm is a cylinder coupling hole portion of the upper arm that is vertically passed through the arm cylinder coupling hole portion of the upper arm and is positioned on a central axis of the upper arm that overlaps with half or more of the length of the lower arm; The upper arm is the boom coupling hole portion is protruded further than the rotating arm base toward a side portion of the upper arm directly above the rotating arm base, The bucket cylinder includes: The bucket cylinder is rotatably attached to the lower arm via both sides thereof.

15. When a multi-joint link is provided between the bucket, the lower arm, and the bucket cylinder, The lower arm is The excavator according to claim 14 , further comprising a lower arm, the upper arm being axially connected to the bucket and the articulated link in sequence along a longitudinal direction of the lower arm immediately adjacent to the central axis of the upper arm.

16. The bucket cylinder includes: A rod, a piston, and a cylinder are included. The cylinder is a head cover located immediately below the rotating arm base, a tube connected to the head cover, a rod cover connected to the tube on the opposite side of the head cover, and a hanger for rotatably connecting the tube to the lower arm, The rod is a rod cover that is located inside and outside the tube and that is surrounded by the rod cover and moves relative to the cylinder; The piston is 15. The drilling rig of claim 14 located within the interior of the tube for movement with the rod.

17. a multi-joint link located on both sides of the lower arm and pivotally connected to the lower arm; The rod is The excavation equipment according to claim 16, wherein the lower arm is axially connected to the articulated link and is minimally exposed from the rod cover around the lower arm, thereby moving away from the central axis of the upper arm together with the articulated link, or is maximally exposed from the rod cover and moves closer to the central axis of the upper arm together with the articulated link.

18. The rod is When minimally exposed from the rod cover, The rod, the rod cover, the tube, and the head cover are The drilling device according to claim 16, wherein the rod, the rod cover, the tube, and the head cover move away from the central axis of the upper arm in this order as the rod moves away from the central axis of the upper arm.

19. The rod is When maximally exposed from the rod cover, The rod, the rod cover, the tube, and the head cover are The drilling device according to claim 16, wherein the rod, the rod cover, the tube, and the head cover are moved away from each other in this order while the rod is positioned on the central axis of the upper arm.

20. The lower arm, When the tube has brackets on both sides, The hanger is a support portion having a cylindrical protruding piece that surrounds the tube and extends toward the bracket; The excavation equipment according to claim 16, further comprising: a locking portion that is disposed on the bracket and that surrounds the protruding piece together with the bracket in a bent shape and is screwed to the bracket.

21. The rod is When minimally exposed from the rod cover, a multi-joint link rotatably connected to the bucket, the lower arm, and the bucket cylinder; The articulated link is the upper arm is axially connected to the lower arm immediately adjacent to the central axis of the upper arm; The upper arm is axially connected to the bucket at a position farther from the central axis than the lower arm is, The excavation rig according to claim 16 , wherein the upper arm is axially connected to the rod of the bucket cylinder at a position farther from the central axis of the upper arm than the bucket is from the bucket cylinder.

22. The rod is When maximally exposed from the rod cover, a multi-joint link rotatably connected to the bucket, the lower arm, and the bucket cylinder; The articulated link is The upper arm is immediately adjacent to the central axis of the upper arm, and is located on the left and right of the central axis of the upper arm, and is axially connected to the lower arm and the rod, The excavator according to claim 16 , wherein the upper arm is axially coupled to the bucket at a position farther from the central axis than the lower arm.

23. The rotating arm base is A lower rotating platform and an upper rotating platform are sequentially stacked between the lower arm and the upper arm, The lower rotating platform and the upper rotating platform are fixed to the lower arm and the upper arm, respectively; Rotating the lower rotating platform relative to the upper rotating platform; a center joint penetrating the lower rotating base and the upper rotating base together with the lower arm; The center joint is The drilling rig of claim 14 located on the central axis of the upper arm.

24. The upper arm is The upper arm has a slip inlet / outlet hole, the boom connection hole, and the arm cylinder connection hole on a lower side, a middle side, and an upper side, The lower arm and the rotating arm base are When the upper arm has a center joint on the central axis, The slip inlet / outlet hole portion of the upper arm is The drilling rig of claim 14 , wherein the center joint is exposed to the outside on the central axis of the upper arm to induce slip joining to or separation from the center joint.

25. The upper arm is When the upper arm has a slip inlet / outlet hole portion, the boom connecting hole portion, and the arm cylinder connecting hole portion on the lower side, the middle side, and the upper side, The slip inlet / outlet hole portion of the upper arm is The drilling rig according to claim 14 , wherein the boom connecting hole is located on the central axis of the upper arm and at the same level as the boom connecting hole in a direction perpendicular to the central axis of the upper arm.

26. The upper arm is When the upper arm has a slip inlet / outlet hole portion, the boom connecting hole portion, and the arm cylinder connecting hole portion on the lower side, the middle side, and the upper side, The excavation device according to claim 14 , wherein the slip inlet / outlet hole portion and the arm cylinder coupling hole portion of the upper arm are located on the central axis of the upper arm.

27. when the bucket cylinder is located on one side of the lower arm and connected to the lower arm, a clamp cylinder is located on the other side of the lower arm and connected to the lower arm, a clamp is located at an end of the lower arm and connected to the lower arm, and a multi-joint link is connected to the lower arm, the lower arm, the rotating link, and the bucket cylinder, The bucket and the rotating link are The articulated link is expanded and contracted in response to the operation of the bucket cylinder, thereby rotating around the central axis of the upper arm, The clamp is The excavation equipment according to claim 14 , wherein the upper arm is axially connected to the lower arm near the central axis thereof, and moves relative to the lower arm in response to operation of the clamp cylinder to rotate up and down.

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