JP2012158916A - Excavation work rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and easily connect a hydraulic supply path of a screw auger rod against wobbling in a rotating direction of a joint engaging part by matching displacement generated from a gap of male and female joints and absorbing a relief margin.SOLUTION: In an excavation work rod provided with a male coupler 117 inside a male joint 102 of a rod 100 including a hydraulic supply path 108 in the inside and provided with a female coupler 118 inside a female joint 103, the hydraulic supply path 108 comprises a hydraulic hose, a projected guide is formed at the male coupler 117, a projected guide groove is formed at the female coupler 118, detachment is prevented by a stopper of the female coupler 118 and a bearing is freely rotatably provided in the female coupler 118. An end of an outer peripheral part cover pipe 112 of hydraulic piping 111 is fitted to a bearing 5 and the female coupler 118, the cover pipe 112 and the bearing are fixed with a set machine screw, and a positioning pin for turning the positioning hole of the cover pipe 112 to a loose hole is screwed to the outer periphery of the female coupler 118.

Description

  The present invention relates to an excavation work rod such as a screw auger or a stirring rod in which a hydraulic pipe as a hydraulic supply passage is vertically passed through the rod.

Conventionally, as a joint device for connecting a plurality of screw augers each passing through a hydraulic pipe, a male coupler is provided on one end of both screw augers to be connected. The female joints provided on the same are connected to female couplers on the same extension of hydraulic piping, and the male and female couplers are engaged when the male and female joints are engaged. 2 is known.
Japanese Patent No. 3687027 Japanese Patent No. 4247539

  As shown in FIG. 14 to FIG. 17, a male joint 2 of a regular hexagonal column is formed at one end of a rod 1 of one screw auger among both screw augers to be connected. An inner cylinder 5 having a smaller diameter than the cylinder 3 and an inner cylinder 5 having a smaller diameter than the outer cylinder are concentrically passed through the inner cylinder 3 so that the cylinder 3 is interposed between the outer cylinder 4 and the outer cylinder 4. The chemical liquid supply path 6 is formed as a first hydraulic pressure supply path 7 between the outer cylinder 4 and the inner cylinder 5, and the second hydraulic pressure supply path 8 is formed in the inner cylinder 5 as a triple path.

  A round hole 9 communicating with the inside of the cylinder 3 of the rod 1 is vertically passed through the male joint 2. In the round hole 9, an inner flange 18 is provided at the tip of the outer cylinder 4 via the auxiliary outer cylinder 10. A male coupler receiving outer cylinder 11 having a shaft is connected on a straight line.

  A male coupler bearing inner cylinder 13 is connected to the distal end portion of the inner cylinder 5 via a sub-inner cylinder 12 in a straight line so that a round hole 9 and a sub-outer cylinder 10 are received in the male joint 2. A chemical liquid passage 14 communicating with the chemical liquid supply path 6 is provided between the supporting outer cylinder 11 and the auxiliary outer cylinder 10, the receiving outer cylinder 11 and the auxiliary inner cylinder 12, and the bearing inner cylinder 13. The auxiliary first hydraulic passage 15 communicating with the first hydraulic pressure supply passage 7 is provided in the auxiliary inner cylinder 12 and the bearing inner cylinder 13, and the auxiliary second hydraulic passage 16 communicating with the second hydraulic pressure supply passage 8 is defined by 3 The male coupler head 17 is engaged with the support outer cylinder 11 and the bearing inner cylinder 13 so as to be rotatable about the axis in a straight line.

  The male coupler head 17 is a cylindrical body having a diameter that is appropriately smaller than the inner diameter of the round hole 9 and projects a shaft 19 perpendicularly from the center of the rear end surface thereof. The rear end surface of the head 17 is connected to the outer cylinder 11 for receiving. It abuts slidably on the front surface of the inner flange 18.

  The outer peripheral surface of the head 17 is mounted on the ring-shaped bearing 21 supported by the inner peripheral surface of the round hole 9 by the arms 20 in a state where the shaft 19 is rotatably supported in the distal end portion of the inner cylinder 13 for bearing. Support for rotation.

  Inside the head 17, the cylindrical first and second hydraulic male couplers 22, 23 are positioned in a diametrically opposed position on the arc centered on the head 17 axis, and the tip ends of both couplers from the head tip surface. The head joint is provided in parallel with the head axis in a state where it is properly projected to the male joint opening end.

  The first and second hydraulic male couplers 22 and 23 have the same structure, and the inside of the cylinder is defined as a first hydraulic passage 24 and a second hydraulic passage 25 which are round holes with a tip opening, and each cylindrical protrusion is a female. The valve opening and closing cylinders 36 and 37 for the joint valve are formed on the valve seats 26 and 27 by slightly narrowing the inner peripheral surfaces of the distal ends of the valve opening and closing cylinders 36 and 37, and in the passages 24 and 25. A valve body 28, 29, which is a closed-end cylindrical body, in which valve holes 30, 31 are formed in the peripheral portion of the closed front end surface, and passive pins 32, 33 are projected from the central portion of the closed front end surface. The valve holes 30, 31 are in contact with the valve seats 26, 27 to close when the valve is advanced, and the valve holes 30, 31 are opened when the valve is retracted. 34 and 35 are always bullet-opened.

  The passive pins 32 and 33 are seen at the open ends of the passages 24 and 25 when the valve is closed.

  The rear ends of the first and second hydraulic passages 24 and 25 are connected to communication holes 38 and 39 formed in the head 17, and one of the through holes 38 penetrates to the rear end surface of the head 17. It opens into the annular groove 40 formed in the front surface of the inner flange 18 of the outer cylinder 11 and passes through the hole 41... Penetrating from the bottom surface of the annular groove 40 to the inner flange 18 to the rear surface. The other through hole 39 passes through the shaft 19 and opens into the auxiliary second hydraulic passage 16.

  A female joint 43 having a socket 43 'having a regular hexagonal hole is connected to the other end of the rod 42 of the other screw auger to be connected to the rod 1 of the screw auger in a straight line. An inner cylinder 45 having a smaller diameter than the cylinder 44 and an inner cylinder 46 having a smaller diameter than the outer cylinder 45 are passed through concentrically in the cylinder 44, so that the cylinder 44 is interposed between the cylinder 44 and the outer cylinder 45. The chemical solution supply path 47 is formed as a first hydraulic pressure supply path 48 between the outer cylinder 45 and the inner cylinder 46, and a second hydraulic pressure supply path 49 is formed in the inner cylinder 46 as a triple path.

  The socket 43 ′ of the female joint 43 communicates with the chemical supply passage 56 of the rod through the chemical passage 50. The male joint (2) is connected to the outer end of the cylinder 44 from the passage 50 in the same manner as the male joint. The cylinder 45 is connected to the auxiliary outer cylinder 51 and the female coupler receiving outer cylinder 52 with the inner flange 53, and the inner cylinder 46 is connected to the auxiliary inner cylinder 54 and the female coupler bearing inner cylinder 55, whereby the chemical solution supply path is connected. 47, a chemical solution passage 56 communicating with 47, a sub first hydraulic passage 57 communicating with the first hydraulic supply passage 48, and a sub second hydraulic passage 58 communicating with the second hydraulic supply passage 49 are formed in a triple passage. A female coupler head 59 is rotatably engaged with the support outer cylinder 52 and the bearing inner cylinder 55.

  Similar to the male coupler head, the female coupler head 59 has a shaft 80 projecting from the rear surface of a cylindrical body. The female coupler head 59 is supported by the inner flange 53 of the receiving outer cylinder 52 and the shaft 80 is supported by the bearing inner cylinder 55. The ring-shaped bearing 82 is rotatably supported by the inner peripheral surface of the round hole 50 via the arms 81.

  In the head 59, the cylindrical first and second hydraulic female couplers 60 and 61 are arcs centered on the axis of the head 59, and on the arc having the same diameter as the arrangement arc of the male couplers 22 and 23, In the state where the tips of both couplers are located at the innermost part of the female joint socket 43 ′ at positions opposed to each other in the diametrical direction, they are installed in parallel with the axis of the head 59.

  The female couplers 60 and 61 have the same structure, and round holes 62 and 63 at the tip opening are provided inside the head 59, and inner flange stoppers 64 and 65 are provided on the inner peripheral surface of the opening end. The closed cylindrical valve seats 66 and 67 having an outer diameter appropriately smaller than the inner diameter of the round holes are concentrically fixed in the round holes 62 and 63, and the first hydraulic passage 68 is formed inside the cylindrical valve seat. The valve seats 66 and 67 are provided with valve holes 70 and 71 in the periphery of the closed front end face, and the male joint is connected to the male valves 28 and 29 at the center of the closed front end face. Valve opening / closing pins 72 and 73 are provided in a projecting manner.

  Between such valve seats 66 and 67 and the round holes 62 and 63, cylindrical valves 74 and 75 having outer flange stoppers 76 and 77 to be engaged with the stoppers 64 and 65 at their rear end portions can freely advance and retract. The valve holes 70 and 71 are closed when the valve moves forward, and the valve holes 70 and 71 are opened when the valve moves backward.

  Similar to the male coupler, communication through holes 83 and 84 are connected to the rear ends of the first and second hydraulic passages 68 and 69, and one of the through holes 83 is an annular groove 85 of the inner flange 52. The other through hole 84 communicates with the sub second hydraulic passage 58 through the shaft 80 in the vertical direction.

  In the figure, 87 is a packing provided on the innermost circumferential surface of the socket innermost part of the female joint 43, and the front end surface of the male joint 2 is pressed against it.

  Pin holes 88 and 89 of the male and female joints 2 and 43 are formed, and connection pins 90 are driven into these pin holes 88 and 89 to fix the joint connection.

  In the joint device, since the male and female couplers are in the eccentric position, if the backlash in the rotational direction occurs due to wear deformation at the fitting part of the male and female joints, the male and female couplers are displaced in the rotational direction and cannot be engaged. There are shortcomings.

  In order to improve this, in Patent Document 1, a double hydraulic passage having a chemical fluid passage in which the screw auger communicates with a chemical fluid supply passage in the male joint and a valve in communication with the two hydraulic supply passages in the male joint. Is formed into a concentric triple path, and a double hydraulic pressure having a chemical liquid passage communicating with the chemical liquid supply path of the screw auger and a valve opening / closing protrusion communicating with the two hydraulic pressure supply paths in the female joint. The passage was formed in a triple path.

  That is, in Patent Document 1, since the three members of the auxiliary chemical solution supply path and the two auxiliary hydraulic pressure supply paths provided in the two joints are formed in a triple path concentrically with the axis of the joint, Even if backlash occurs due to wear deformation at the joint, the secondary chemical liquid supply paths of both joints and the two secondary hydraulic pressure supply paths can be reliably communicated with each other when both joints are engaged.

  Further, in Patent Document 2, rattling occurs due to wear or the like on the engagement surfaces of the male and female joints, thereby causing a positional deviation in the rotational direction that inhibits the engagement between the male coupler and the female coupler of both joints. When this occurs, the male and female couplers can be corrected to an appropriate position where they can be engaged and reliably engaged by rotating one of the couplers appropriately according to the displacement.

  However, in the above-mentioned patent document 1, the three members of the auxiliary chemical solution supply path and the two auxiliary hydraulic pressure supply paths are simply formed in a triple path concentrically with the shaft center of the joint. If the gap further increases due to wear after the original gap equivalent to 1 mm of the male / female joint is used, which is only what ensures the coupling, the alignment becomes difficult.

  It is difficult to maintain the “deviation” pressure at the mating surface of each port.

  Further, in Patent Document 2, rattling occurs due to wear or the like on the engagement surfaces of the male and female joints, thereby causing a positional deviation in the rotational direction that inhibits the engagement between the male coupler and the female coupler of both joints. When this occurs, the operation of rotating one coupler appropriately according to the displacement and performing the alignment must be performed, and this rotation operation and alignment is manual and cumbersome.

  Furthermore, in Patent Document 2, the hydraulic pressure supply path is limited to two lines, and it is not possible to cope with backlash due to wear of the joint when providing a plurality of hydraulic pressure supply paths with four lines or more in the joint.

  The object of the present invention is to eliminate the above inconveniences, and to ensure that the hydraulic supply passages of 4 lines or more of both screw auger rods to be connected are surely and without troublesome operation even if the engaging portion of the joint is loose in the rotational direction. It is another object of the present invention to provide an excavation work rod that can be connected and can cope with variations in the orientation of male and female joints when manufacturing the rod.

  In order to achieve the above object, the present invention as set forth in claim 1 includes a male joint and a female joint at both ends to which a rod vertically passing through a hydraulic supply path by a hydraulic pipe is to be connected. In the excavation work rod that has a male coupler that communicates with the hydraulic pressure supply path of the rod and a female coupler that communicates with the hydraulic pressure supply path of the other rod inside the female joint, the hydraulic piping that constitutes the hydraulic pressure supply path is a hose The male coupler has a guide convex guide, and the female coupler has a guide groove for engaging the guide convex guide. The stopper is attached to the female coupler, and the bearing is rotated to the female coupler while preventing it from coming off. The cover pipe and the bearing can be installed freely by fitting the end of the cover pipe that covers the outer periphery of the hydraulic pipe to the bearing and the female coupler. Were fixed with set screw, it is an summarized in that screwed projecting the positioning hole is formed in the cover pipe positioning pins to loose hole in the female coupler periphery.

  According to the first aspect of the present invention, the male coupler is formed with a guide convex guide, and the female coupler is formed with a guide groove engaging with the guide convex guide. By engaging the groove, the male coupler and the female coupler can be reliably fitted.

  Furthermore, since the female coupler is rotatable with respect to the cover pipe and the bearing with respect to the gap further increased from the original gap 1 mm in the rotation direction of the male and female joints, the position of the female coupler should be adjusted. Can absorb and adjust the clearance.

  Such rotation of the female coupler is restricted by the positioning pin even if it occurs during excavation, and the gap between the positioning pin and the positioning hole (loose hole) absorbs play due to the wear of the joint. Become.

  Furthermore, the combination of the female coupler and the cover pipe positioning pin is designed so that the male and female joints can be easily set when the rod is manufactured. At the time of manufacture, since the orientation of the joint is determined in accordance with the blade pitch, it is possible to adjust the orientation of the joint with respect to the separation of the male joint and the female joint.

  According to the second aspect of the present invention, the positioning holes formed on the cover pipe and the screw holes provided on the outer periphery of the female coupler are formed at appropriate intervals in the circumferential direction with respect to the positioning pins, and the holes are matched with each other. The gist is to select.

  According to the second aspect of the present invention, in the relationship between the positioning pin and the positioning hole formed in the cover pipe, the positioning pin is inserted into the screw hole provided on the outer periphery of the female coupler. Positioning pins can be set by selecting the one that matches the working hole, making positioning easier.

  According to the third aspect of the present invention, four or more hydraulic supply paths by the hydraulic pipe are arranged radially with respect to the center of the rod, and a pipe guide having an insertion hole for the hydraulic pipe is provided on the cover pipe. Is a summary.

  According to the third aspect of the present invention, the hydraulic system can operate not only one system of the A and B ports, but also several systems and even several tens of systems of actuators (cylinders). Even if the number of hydraulic pipes increases to four or more, the positioning can be performed by absorbing the clearance.

  As described above, the excavation work rod according to the present invention ensures reliable and troublesome operation of the hydraulic supply passages of four or more lines of both screw auger rods to be connected even if the engagement portion of the joint is loose in the rotational direction. In addition, it can be used for variations in the orientation of male and female joints when manufacturing rods.

  And, there are male joints and female joints at both ends of the rod to which the rod passing through the hydraulic pipe is to be connected, and a male coupler that communicates with the hydraulic pipe of the other rod is provided inside the male joint. In the excavation work rod provided with a female coupler that communicates with the hydraulic piping of the other rod, the "deviation" caused by the gap between the male and female joints by engaging the guide convex guide of the male coupler and the guide groove of the female coupler In addition, the hydraulic piping that constitutes the hydraulic supply path is a hose, the female coupler for the cover pipe and the bearing is rotatable, and the positioning pin is covered. The positioning hole formed in the pipe can be absorbed by making it a loose hole, and the hydraulic supply path of both screw auger rods can be operated reliably and troublesome In which it can be connected to the teeth.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal side view showing an embodiment of an excavation work rod according to the present invention, FIG. 2 is an external side view thereof, FIG. 3 is a longitudinal side view of a hydraulic pipe as a main part, and 100 in the figure is a screw auger It is a rod and has a screw blade 101 that turns around the outer periphery.

  A plurality of rods 100 of the screw auger are to be connected to each other. A male pipe 102 of a regular hexagonal column is connected to one end of a rod pipe 106 as a main body, and a socket having a regular hexagonal hole is formed at the other end. The female joint 103 is connected in a straight line with the axis.

  Further, pin holes 104 and 105 are formed in the male joint 102 and the female joint 103, and a connection pin (not shown) is driven into these pin holes 104 and 105 to fix the joint connection.

  In the rod inner tube 107 housed in the hollow of the rod 100, a hydraulic pressure supply passage 108 having a smaller diameter than that of the rod inner tube 107 is passed through concentrically, whereby the rod inner tube 107 and the hydraulic pressure supply passage 108 are connected to each other. A liquid supply path 109 such as cement milk and water is formed between them. In the figure, 132 is a coupler holder that covers the outer periphery of the male coupler 117 and is fixed to the male coupler 117 with a set screw 141. The coupler holder 132 is formed with a connection flange 132a at the front end for bolting the coupler holder 132 to the male joint 102.

  The rod inner tube 107 is supported by a flange plate 110 provided inside the rod pipe 106.

  As shown in FIG. 3, the hydraulic supply path 108 is formed by arranging hydraulic piping 111, but the outer peripheral portion thereof is covered with a cover pipe 112, and the male coupler 117 and the female coupler 118 are arranged at both ends of the cover pipe 112. Attach to each.

  A male coupler 117 located in the male joint 102 and a female coupler 118 located in the female joint 103 are provided at both ends of the hydraulic pressure supply path 108.

  Four or more (four in the drawing) of the hydraulic pipes 111 are arranged radially with respect to the center of the rod. The hydraulic pipe 111 is a flexible pipe with a pressure-resistant hydraulic hose.

  As shown in FIG. 7, the cover pipe 112 is formed with a pipe guide 115 having a through hole 115 a through which the hydraulic pipe 111 is inserted at one end in a partition shape, and the other end is the front end of the female coupler 118. It was formed as a fitting portion 116 to which In the figure, 115b is an insertion hole through which a cover pipe set bolt 133 for fixing the pipe guide 115 to the male coupler 117 is inserted.

  An insertion hole is formed in the fitting portion 116 as an insertion hole 116 a of a (bearing) set screw 137 described later and a positioning hole 116 b of the positioning pin 139.

  These male coupler 117 and female coupler 118 are fitted to the female coupler 118 and male coupler 117 of the other rod 100, and the male coupler 117 is a cylindrical body, as shown in FIGS. A pipe holder 114 is built in, and at the end of the pipe holder 114, a hydraulic male coupler 119 having a round opening at the tip is formed inside the cylinder, and the hydraulic male coupler 119 is projected from the tip of the male coupler head 117a. The cylindrical protrusion is a valve opening / closing cylinder with respect to the valve on the female coupler 118 side, and the inner peripheral surface of the tip of the valve opening / closing cylinder is slightly narrowed to be formed in the valve seat 120. The valve 121 formed by projecting the valve opening / closing pin 121a is inserted so as to freely advance and retract.

  In the hydraulic male coupler 119, a spring 122 is interposed so that the valve hole communicating with the valve seat 120 is closed when the valve 121 moves forward, and the valve hole is opened when the valve moves backward. The spring 122 is always bulleted in a closed state. In the figure, reference numeral 114 denotes a pipe holder formed at the rear end of the hydraulic male coupler 119.

  A guide convex guide 123 formed by forming a ridge from the tip to the middle in the length direction (parallel to the axis) on the outer periphery of the male coupler head 117a was formed. In the example shown in the figure, two guide convex guides 123 are provided so as to face each other, and as shown in FIG. 6, the tip of the guide convex guide 123 has a tapered surface 123a that is tapered first.

  As shown in FIGS. 9 and 10, the female coupler 118 has a female coupler head 118a into which the male coupler head 117a is inserted. The coupler 124 is installed in a spiral manner, and a closed end cylindrical valve seat 131 having an outer diameter appropriately smaller than the inner diameter of the hydraulic knife coupler 124 is concentrically fixed in the hydraulic knife coupler 124. The inside is a hydraulic passage, and a valve hole is formed in the periphery of the closed front end surface of the valve seat 131, and the valve 125 having a valve opening / closing pin 125a projecting from the valve 121 on the hydraulic male coupler 119 side is advanced and retracted. Insert freely.

  In the hydraulic female coupler 124, a spring 126 is interposed so that the valve hole is closed when the valve is advanced and opened when the valve is moved backward, and the spring 126 is constantly repelled in a closed state.

  The hydraulic female coupler 124 is connected to the hydraulic hose 111b through the pipe holder 113.

  On the inner peripheral surface of the female coupler head 118a, a guide groove 128 that engages with a guide convex guide 123 provided on the male coupler head 117a is formed in the length direction (axis) from the opening to the middle of the female coupler head 118a. Formed in parallel with the core). Two guide grooves 128 are provided so as to be opposed to the shaft core so as to correspond to the guide convex guide 123, and as shown in FIG. 13, the tip thereof is a tapered surface 128a spreading toward the tip.

  The female coupler 118 has a reduced outer diameter near the end, and a donut plate-shaped bearing 135 is rotatably fitted therein, and a disk-shaped stopper 134 through which the pipe holder 113 passes is fixed with a stopper set bolt 136. Are attached to the female coupler 118 so that the bearing 135 does not come out.

  The cover pipe 112 is fastened to the male coupler 117 with the cover pipe set bolt 133 as described above, and the female coupler 118 is fitted with the end of the cover pipe 112 to the bearing 135 and the female coupler 118, and the cover pipe 112 And the bearing 135 are fixed with a (bearing) set screw 137.

  As shown in FIG. 12, a number of screw holes 138 into which the (bearing) set screws 137 are screwed are provided at appropriate intervals on the outer periphery of the bearing 135, and the (bearing) set screws 137 formed in the fitting portion 116 of the cover pipe 112. In the example shown in the figure, four insertion holes 116a are formed at intervals of 90 °, and are fixed with set screws 137 at positions where these screw holes 138 and insertion holes 116a match.

  Further, as shown in FIG. 11, a positioning hole 116 b is formed in the fitting portion 116 of the cover pipe 112 as an insertion hole for the positioning pin 139. The positioning hole 116 b is a horizontally long circular shape and is formed on the positioning pin 139. On the other hand, when it becomes a loose hole and the positioning pin 139 is received in the positioning hole 116b, it has a gap α.

  Incidentally, the gap α is smaller than or equal to the gap β when the guide groove 128 formed on the inner peripheral surface of the female coupler head 118a shown in FIG. 13 is engaged with the guide convex guide 123 provided on the male coupler head 117a. It was supposed to be. (Α ≦ β)

  A plurality of screw holes 140 provided in the female coupler 118 into which the positioning holes 116b and the positioning pins 139 are screwed are arranged at appropriate intervals in the circumferential direction of the fitting portion 116 of the cover pipe 112 and the circumferential direction of the female coupler 118, respectively. , Of which the holes of the positioning hole 116b and the screw hole 140 are matched, and the positioning pin 139 is set.

  Next, the usage will be described. First, the pipe holder 113 is assembled to the female coupler 118, the bearing 135 is sandwiched by the stopper 134, and the stopper set bolt 136 is set.

  Next, the hydraulic pipe 111 is set in the pipe holder 113, the hydraulic pipe 111 is put into the cover pipe 112, and the bearing 135 is fixed with the set screw 137 when the cover pipe 112 is covered with the bearing 135. (At this stage, the female coupler 118 is free to rotate with respect to the bearing 135.)

  A pipe holder 114 is set on the male coupler 117, connected to a hydraulic pipe 111 (set longer as a hydraulic hose) protruding from the pipe guide 115 of the cover pipe 112, and fixed with a cover pipe set bolt 133.

  The positioning pin 139 is set by looking at the direction of the male joint 102 and the female joint 103 of the rod 100 of the screw auger having the screw blades 101. The cover pipe set bolt 133 is also set by looking at the direction of the screw joint.

  A cover pipe 112 having a male coupler 117 and a female coupler 118 at the front and rear ends is disposed in the rod 100 of the screw auger, a coupler holder 132 is fixed to the male coupler 117 with a set screw 141, and a coupler holder is attached to the male joint 102. 132 is fixed with a bolt 142 through a connection flange 132a.

  As described above, according to the present invention, in the screw, depending on the blade pitch of the screw blade 101 and the rod length of the rod 100, the orientation of the male joint 102 and the female joint 103 may deviate from a predetermined position. The set screw of the hydraulic pipe 111 and the positioning pin 139 can be aligned to a predetermined reference position.

  Further, the displacement due to wear of the joint after use can be absorbed by the clearance α of the positioning hole 116b of the positioning pin 139.

  FIG. 8 shows this, and α is determined as α ≧ h with respect to the wear amount h usable as a joint.

  In the above embodiment, four hydraulic pipes 111 in the hydraulic hose are arranged radially with respect to the center of the rod. However, as another embodiment, four or more pipes can be arranged radially.

  For example, by setting the number to 10 or 6, it is possible to operate not only one system of A and B ports but also several systems and even tens of systems of actuators (cylinders).

It is a vertical side view which shows one Embodiment of the excavation work rod of this invention. It is an appearance side view showing one embodiment of the excavation work rod of the present invention. It is a vertical side view of the hydraulic piping which is the principal part which shows embodiment of the excavation work rod of this invention. It is a front view of an o-coupler. It is the sectional view on the AA line of FIG. It is a front view of a guidance convex guide. It is explanatory drawing of a cover pipe. It is explanatory drawing which shows the displacement by abrasion of the joint after use. It is a front view of a female coupler. FIG. 10 is a sectional view taken along line AA in FIG. 9. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is explanatory drawing of a guide groove and a guide convex guide. It is a longitudinal cross-sectional view of the male joint part which shows a prior art example. It is a partially omitted vertical sectional view of a female joint portion showing a conventional example. It is a partial omission longitudinal cross-sectional view of the connection state of the male and female joint which shows a prior art example. It is the IV-IV line longitudinal cross-sectional view of FIG.

DESCRIPTION OF SYMBOLS 100 ... Rod 101 ... Screw blade 102 ... Male joint 103 ... Female joint 104, 105 ... Pin hole 106 ... Rod pipe 107 ... Rod inner pipe 108 ... Hydraulic supply path 109 ... Liquid supply path 110 ... Flange plate 111 ... Hydraulic piping 111a ... Non-flexible tube 111b ... Hydraulic hose 112 ... Pipe cover pipes 113, 114 ... Pipe holder 115 ... Pipe guides 115a, 115b ... Through hole 116 ... Fitting portion 116a ... Through hole 116b ... Positioning hole 117 ... Male coupler 117a ... Male Coupler head 118 ... Female coupler 118a ... Female coupler head 119 ... Hydraulic male coupler 120 ... Valve seat 121 ... Valve 121a ... Valve opening / closing pin 122 ... Spring 123 ... Induction convex guide 123a ... Tapered surface 124 ... Hydraulic female coupler 125 ... Valve 12 a ... valve opening / closing pin 126 ... spring 128 ... guide groove 128a ... taper surface 129 ... collar 130 ... hose connection fitting 131 ... valve seat 132 ... coupler holder 133 ... cover pipe set bolt 134 ... stopper 135 ... bearing 136 ... stopper set bolt 137 ... set screw 138 ... screw hole 139 ... positioning pin 140 ... screw hole 141 ... set screw 142 ... bolt

Claims (3)

There are male joints and female joints at both ends of the rod that should be connected to the rod that has passed through the hydraulic supply path by hydraulic piping inside, and a male coupler that communicates with the hydraulic supply path of the other rod is provided inside the male joint. In the excavation work rod provided with a female coupler communicating with the hydraulic supply path of the other rod inside,
The hydraulic piping constituting the hydraulic supply path is a hose,
The male coupler has a guide convex guide, and the female coupler has a guide groove for engaging the guide convex guide.
A bearing is provided on the female coupler in a rotatable manner while preventing it from coming off with a stopper attached to the female coupler, and the end of the cover pipe, which is a pipe that covers the outer periphery of the hydraulic piping, is fitted to the bearing and the female coupler, And the bearing with a set screw,
An excavation work rod, wherein a positioning pin having a positioning hole formed in a cover pipe as a loose hole is screwed and protruded to the outer periphery of the female coupler.   The excavation operation according to claim 1, wherein the positioning holes formed on the cover pipe and the screw holes provided on the outer periphery of the female coupler are formed at appropriate intervals in the circumferential direction with respect to the positioning pins, and the holes are selected so that the holes match each other. rod.   The excavation according to claim 1 or 2, wherein four or more hydraulic supply paths by the hydraulic pipe are arranged radially with respect to the center of the rod, and a pipe guide having an insertion hole for the hydraulic pipe is provided on the cover pipe. Working rod.

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