JP5643130B2 - Excavator swivel equipment - Google Patents

Description

  The present invention relates to a swivel device for supplying a liquid such as cement milk to a drilling rod in an excavator that excavates the ground with a drilling rod.

  As a conventional swivel device for an excavator, for example, there is one described in Patent Document 1 below. This swivel device is provided in a drive part of an excavator and supplies a liquid such as cement milk to a drilling rod that is rotatably connected to the drive part. A swivel pipe (hollow) is provided at the upper end of the output shaft of the drive part. The swivel shaft is connected to the outer periphery of the swivel pipe, and a seal case (packing case) that is non-rotatably mounted on the drive unit is relatively rotatably fitted to the swivel pipe. And liquid-tightly sealed by seal rings provided in a plurality of stages above and below. The upper end opening of the seal case is a liquid supply port, and the liquid supply pipe plug is screwed into this connection to connect the liquid such as cement milk supplied from the liquid supply pipe to the hollow of the output shaft from the rotating swivel pipe. It can be fed to the liquid passage of the excavating rod through the section and discharged into the ground from the discharge port on the lower end side of the rod.

Japanese Patent Laid-Open No. 2000-240390

  The above-mentioned conventional swivel device has a seal ring made up of an O-ring as a packing for shaft sealing between a swivel pipe and a seal case, and is arranged in a plurality of stages at intervals in the seal case. Since the ring receiving grooves are provided at regular intervals in the axial direction on the inner peripheral surface of the, and the grease retaining groove is provided between adjacent ring receiving grooves, the structure of the seal case is complicated and manufactured. In addition to the high cost, there is a problem that the installation and removal of the seal ring is troublesome.

  In view of the above circumstances, an object of the present invention is to provide a swivel device for an excavator in which the structure of the packing case is simple, the packing can be easily attached and detached, and the maintenance can be easily performed.

Means for solving the above problems will be described with reference numerals of the embodiments described later. The invention according to claim 1 is provided in the drive unit 1 of the excavator and is rotatable to the drive unit 1. A swivel device for supplying a liquid such as cement milk to a connected excavation rod 5, wherein a swivel shaft 8 having a liquid passage 16 is connected to the upper end of the output shaft 4 of the drive unit 1, On the outer periphery of the swivel shaft 8, a packing case 11 fixed to the outer frame portion 15 of the drive unit 1 is fitted so as to be relatively rotatable, and a gland packing 31A packed in the packing case 11 is pivoted. A packing presser 10 to be tightened in the direction is attached to the upper end side of the packing case 11, and the lower end of the packing presser 10 is pressed against the upper end side of the packing 31 </ b> A and the upper end opening forms a liquid supply port 27. A cylindrical portion 10a is introduced into the liquid flow path 16 of the shaft 8, and attached to the cylindrical portion 10a is removed by attaching or contracting a spring or the like to adhere to the inner surface of the cylinder by expanding and contracting the spring when necessary. Ri name and decorated the kimono for removing the coil spring 41 in a compressed state,
In the cylindrical portion 10a of the packing presser 10, there is a cylinder that overlaps vertically in a surface contact state between the lower end side of the adhering matter removing coil spring 41 and the upper end side of the swivel shaft 8, and is relatively rotatable. A slip ring 44 including an upper ring 42 in contact with the inner peripheral surface of the portion 10a and a lower ring 43 in contact with the upper end surface of the swivel shaft 8 is interposed .

According to a second aspect of the present invention, in the swivel device for an excavator according to the first aspect , the collar 23 is detachably fitted and fixed to the swivel shaft 8, and the packing case 11 is rotated relative to the outer periphery of the collar 23. It is characterized by being able to fit freely.

Claim 3 is a swivel device for an excavator according to claim 1 or 2 , wherein an oiling ring 32A is interposed between gland packings 31A arranged in a plurality of upper and lower stages in the packing case 11. It is characterized by.

The invention according to claim 4 is a double swivel device for supplying a liquid such as cement milk to two locations of a drilling rod 5 which is provided in the drive unit 1 of the excavator and is rotatably connected to the drive unit 1. The swivel shaft 8 through which the first and second liquid passages 16 and 17 are penetrated is connected to the upper end of the output shaft 4 of the drive unit 1. The first packing case 11 fitted on the upper portion of the cylindrical casing 13 fixed to the outer frame portion 15 of the driving unit 1 is relatively rotatably fitted, and is packed in the first packing case 11. A first packing presser 10 that is tightened in the axial direction from the upper end side of the gland packing 31A is attached to the upper end portion of the cylindrical casing 13, and the lower end of the first packing presser 10 is pressed against the upper end side of the packing 31A and the upper end opening. Is the liquid supply port 7 and a cylindrical portion 10a for introducing the liquid into the first liquid passage 16 of the swivel shaft 8. The cylindrical portion 10a is provided with a spring for adhering substances such as liquid soot adhering to the inner peripheral surface. The attached coil removing coil spring 41 that breaks and removes by expanding and contracting is housed in a compressed state, and the second packing case 12 fitted in the lower part of the cylindrical casing 13 is relatively fitted on the lower outer periphery of the swivel shaft 8. A second packing presser 20 is attached to the lower end portion of the cylindrical casing 13 for fitting the gland packing 31B packed in the second packing case 12 in the axial direction from its lower end side. The casing 13 is provided with a liquid supply port 37 for introducing a liquid into the second liquid passage 17 of the swivel shaft 8.

According to a fifth aspect of the present invention, in the swivel device for an excavator according to the fourth aspect, the cylindrical portion 10 a of the first packing presser 10 has a surface between the lower end side of the coil spring 41 and the upper end side of the swivel shaft 8. In a contact state, a slip ring 44 including an upper ring 42 contacting the inner peripheral surface of the cylindrical portion and a lower ring 43 contacting the upper end surface of the swivel shaft 8 is interposed. It is characterized by that.

According to a sixth aspect of the present invention, in the swivel device for excavator according to the fourth or fifth aspect , the collars 23 and 24 are detachably fitted and fixed to the upper side and the lower side of the swivel shaft 8, respectively. The first packing case 11 is fitted to the outer periphery of the lower packing 24, and the second packing case 12 is fitted to the outer periphery of the lower collar 24 so as to be relatively rotatable.

A seventh aspect of the present invention is the swivel device for an excavator according to any one of the fourth to sixth aspects, wherein the gland packings 31A and 31B are arranged in a plurality of upper and lower stages in the first and second packing cases 11 and 12, respectively. An oil supply ring 32A, 32B is interposed therebetween.

  The effect of the invention by the above-described solution means will be described with reference numerals in the embodiments described later. According to the invention according to claim 1, the swivel device 7 has the swivel shaft 8 at the upper end of the output shaft 4 of the drive unit 1. The packing case 11 fixed to the outer frame portion 15 of the drive unit 1 is fitted to the outer periphery of the swivel shaft 8 so as to be relatively rotatable, and a gland packing 31A packed in the packing case 11 is connected. A packing presser 10 is attached to the upper end portion of the packing case 11, and the structure is simple. The gland packing 31 </ b> A is packed in the packing case 11, and the packing case 11 is fitted to the swivel shaft 8. By attaching the first packing presser 10 to the packing case 11, it can be easily attached, and the gland packing 31 It can also be carried out of the replacement easily. In addition, every time the sealing function of the gland packing 31A is lowered, it is only necessary to tighten it in the axial direction with the packing presser 10, so that maintenance is easy and it can be used effectively for a long time.

  Also, the cylindrical portion 10a of the packing presser 10 has a deposit removing coil spring 41 in a compressed state, which removes the deposits such as cement milk wrinkles adhering to the inner peripheral surface thereof by breaking the spring 41 when necessary. When the gland packing 31A is tightened, the coil spring 41 is contracted by loosening the lock nut 50 below the flange portion 10b and then tightening the tightening nut 40. Cement milk wrinkles and the like accumulated between the parts can be automatically broken and removed. Therefore, clogging of the liquid supply port 27 which is the upper end opening of the cylindrical portion 10a can be prevented.

Furthermore , according to the present invention, the cylindrical portion 10a of the packing presser 10 is relatively overlapped with each other between the lower end side of the adhering matter removing coil spring 41 and the upper end side of the swivel shaft 8 in a surface contact state. The coil spring 41 is provided with a slip ring 44 including an upper ring 42 that contacts the inner peripheral surface of the cylindrical portion 10 a and a lower ring 43 that contacts the upper end surface of the swivel shaft 8. Since it does not rotate together by the rotational force of the swivel shaft 8, the upper and lower end contact surfaces of the coil spring 41 are not damaged.

According to the invention of claim 2 , since the collar 23 is detachably fitted and fixed to the swivel shaft 8, and the packing case 11 is relatively rotatably fitted to the outer periphery of the collar 23. When 23 wears out, only this collar 23 needs to be replaced, and the swivel shaft 8 itself can be used as it is, which is very economical.

According to the invention of claim 3 , since the oil supply ring 32A is interposed between the gland packings 31A arranged in a plurality of stages in the packing case 11, the seal oil is supplied to the oil supply ring 32A. This seal oil is uniformly distributed and supplied to the entire gland packing 31A along the outer peripheral surface of the collar 23, and the sealing effect is effectively exhibited.

A double swivel device according to a fourth aspect of the present invention includes a first packing case 11 fitted to an upper portion of a cylindrical casing 13 fixed to an outer frame portion 15 of the drive unit 1 on the outer periphery of the swivel shaft 8. Are attached to the upper end portion of the cylindrical casing 13 so that the gland packing 31A packed in the first packing case 11 is tightened in the axial direction from the upper end side thereof. 8, a second packing case 12 fitted in the lower part of the cylindrical casing 13 is relatively rotatably fitted to the outer periphery of the lower casing 8, and a gland packing 31 </ b> B packed in the second packing case 12 is placed at the lower end. The second packing presser 20 that is tightened in the axial direction from the side is attached to the lower end of the cylindrical casing 13, has a simple structure, and includes the first packing case 11 and The gland packings 31A and 31B of the two packing cases 12 are filled with the gland packings 31A and 31B, respectively, and the packing cases 11 and 12 are fitted to the upper side and the lower side of the swivel shaft 8. In addition, by attaching the first packing presser 10 and the second packing presser 20, it can be easily attached, and the gland packings 31 </ b> A and 31 </ b> B can be easily replaced. Further, when the sealing function of the gland packings 31A and 31B is lowered, it is only necessary to tighten them in the axial direction with the packing pressers 10 and 20 each time. Therefore, maintenance is easy and can be used effectively for a long time.

  The cylindrical portion 10a of the first packing presser 10 is compressed by an adhering material removing coil spring 41 that removes adhering material such as cement milk wrinkles adhering to the inner peripheral surface thereof by expanding and contracting the spring 41 when necessary. When the gland packing 31A is tightened, the coil spring 41 contracts when the lock nut 50 under the flange portion 10b is loosened and then the tightening nut 40 is tightened. It is possible to automatically break and remove cement milk wrinkles and the like accumulated and adhered between the coil portions. Therefore, clogging of the liquid supply port 27 which is the upper end opening of the cylindrical portion 10a can be prevented.

According to the fifth aspect of the present invention, the cylindrical portion 10 a of the first packing presser 10 is vertically moved in a surface contact state between the lower end side of the deposit removing coil spring 41 and the upper end side of the swivel shaft 8. Since a slip ring 44 composed of an upper ring 42 that is overlapped and relatively rotatable and is in contact with the inner peripheral surface of the cylindrical portion 10a and a lower ring 43 that is in contact with the upper end surface of the swivel shaft 8 is interposed, Since the coil spring 41 does not rotate together by the rotational force of the swivel shaft 8, the upper and lower end contact surfaces of the coil spring 41 are not damaged.

According to the invention of claim 6 , the collars 23 and 24 are detachably fitted and fixed to the upper side and the lower side of the swivel shaft 8, respectively, and the first packing case 11 is attached to the outer periphery of the upper side collar 23. Since the second packing case 12 is relatively rotatably fitted to the outer periphery of the lower collar 24, when the collars 23 and 24 are worn, only the collars 23 and 24 need to be replaced. Since it can be used as it is, it is extremely economical.

According to the seventh aspect of the present invention, the oil supply rings 32A and 32B are interposed between the gland packings 31A and 31B disposed in the upper and lower stages in the packing cases 11 and 12, respectively. , 32B is supplied to the gland packings 31A, 31B uniformly along the outer peripheral surfaces of the collars 23, 24, and the sealing effect is effectively exhibited.

It is a front view which shows the whole excavator. It is an enlarged front view which shows the drive part side of an excavator. It is a longitudinal cross-sectional view of the swivel device according to the present invention. FIG. 4 is a partially enlarged view of the swivel device shown in FIG. 3. (a) is an enlarged front view showing a stirring blade portion of the excavator, and (b) is a sectional view taken along line XX of (a).

  A preferred embodiment of the present invention will be described below with reference to the drawings. The excavator shown here is of a biaxial auger type in which two augers are provided in parallel, as shown in FIGS. A drive unit 1 is provided in a machine frame 30 supported so as to be movable up and down along a tower (leader) (not shown). The drive unit 1 includes a motor 2 installed at an upper portion and a reduction gear mechanism 3 for decelerating the motor 2. And an output shaft 4 that is decelerated to a predetermined reduction ratio by the reduction gear mechanism 3 and rotates. The lower end of the output shaft 4 protrudes from the lower portion of the drive unit 1, the excavation rod 5 and the stirring blade 6 are connected by a coupling 60, and the excavation rod 5 and the stirring blade 6 are cemented to the upper end side of the output shaft 4. A swivel device 7 for supplying a liquid such as milk is installed. The swivel device 7 is provided for each output shaft 4 that rotationally drives the excavation rod 5, and the swivel device 7 is separately provided with liquid such as cement milk at two locations on the excavation rod 5 (specifically, two locations on the stirring blade 6). Is a double swivel device to supply.

  3 is a longitudinal sectional view showing the entire swivel device 7, and FIG. 4 is a partially enlarged view of the swivel device 7 shown in FIG. As can be seen from FIG. 3, a swivel shaft 8 is connected to the upper end of the output shaft 4 of the drive unit 1 so as to be integrally rotatable by a coupling 9, and the swivel shaft 8 is provided with a first packing case 11 on the upper side. In addition, a cylindrical casing 13 having a second packing case 12 on the lower side is fitted so as to be rotatable relative to the swivel shaft 8, and the cylindrical casing 13 is connected as shown in FIGS. 2 and 3. The member 14 is fixed to the outer frame portion 15 of the drive unit 1.

  The swivel shaft 8 is composed of an upper small diameter shaft portion 8a and a lower large diameter shaft portion 8b. The swivel shaft 8 has a first liquid passage 16 and a second liquid passage 17 penetrating therethrough. The first liquid passage 16 passes through the central portion of the small-diameter shaft portion 8a, bends at the upper end portion of the large-diameter shaft portion 8b, and has a diameter from a position closer to one side than the central portion of the large-diameter shaft portion 8b. The second fluid passage 17 extends from the upper end of the large diameter shaft portion 8b to the lower end in parallel with the first fluid passage 16 in parallel to the major shaft portion 8b. Further, the lower ends of the first liquid passage 16 and the second liquid passage 17 pass through the respective liquid passages (not shown) penetrating the excavation rod 5, and as shown in FIG. The lower end of the liquid passage 18 opens to the upper discharge port 21 of the shaft portion 47, and the lower end of the liquid passage 19 is the shaft portion 47. The lower discharge port 22 is open.

  Collars 23 and 24 are detachably fitted and fixed to the upper side small diameter shaft portion 8a and the lower side large diameter shaft portion 8b of the swivel shaft 8, respectively. As shown in FIGS. 3 and 4, the collars 23 and 24 are attached to the small-diameter shaft portion 8a and the large-diameter shaft portion 8b with screw tools 25 and 26, respectively, and can be easily replaced.

  As shown in FIG. 3, the cylindrical casing 13 includes an upper casing 13a and a lower casing 13b having a diameter larger than that of the upper casing 13a and connected to the upper casing 13a by a bolt 52. The first packing is provided in the upper casing 13a. The case 11 is fitted and fixed with bolts 28, and the second packing case 12 is fitted with the lower casing 13 b and fixed with bolts 29. A liquid supply port 37 for introducing a liquid such as cement milk into the second liquid passage 17 of the swivel shaft 8 is provided at the upper end of the lower casing 13b.

  As can be seen from FIG. 4, the first packing case 11 is provided with a ring-shaped gland packing 31 </ b> A arranged in a plurality of upper and lower stages, and a space is provided in the circumferential direction between the gland packings 31 </ b> A. An oil supply ring 32A having a hole 32a is interposed at the position, and the gland packing 31A... And the oil supply ring 32A are attached to the collar 23 fitted and fixed to the small-diameter portion 8a on the upper side diameter of the swivel shaft 8. They are relatively rotatably fitted. Each ring-shaped gland packing 31A has a square cross section. Further, an annular concave groove 33 having a shallow depth is formed on the outer peripheral surface of the first packing case 11, and a communication hole 34 that penetrates through the bottom surface of the concave groove 33 and the inner peripheral surface of the first packing case 11. The upper casing 13a is provided with a plurality of oil supply holes 35 penetrating in the thickness direction of the casing, and a stopper plug 36 is screwed to the outer end of each oil supply hole 35.

  Seal oil such as grease is injected into each oil supply hole 35, and the seal oil injected into each oil supply hole 35 passes through the plurality of communication holes 34 from the annular groove 33 as shown in FIG. The seal oil enters the inner peripheral side through the hole 32a of the oil supply ring 32, and the gland packings 31A on the upper and lower sides sandwiching the oil supply ring 32 along the outer peripheral surface of the collar 23. The oil distribution is distributed uniformly throughout. In the embodiment shown in FIGS. 3 and 4, one oiling ring 32 </ b> A is interposed in the middle portion of the gland packing 31 </ b> A... In addition, for example, one oiling ring 32A may be interposed for every two of the plurality of gland packings 31A.

  As shown in FIG. 4, the first packing presser 10 for fastening the gland packings 31A... In the first packing case 11 downward in the axial direction from the upper side is attached to the upper end portion of the upper casing 13a. The first packing presser 10 has a lower end pressed against the uppermost gland packing 31 </ b> A and an upper end opening formed a liquid supply port 27, so that a liquid such as cement milk enters the first liquid passage 16 of the swivel shaft 8. It consists of a cylindrical portion 10a to be introduced and a flange portion 10b protruding from the outer peripheral surface of the cylindrical portion 10a and having a plurality of bolt insertion holes 38. A plurality of fixing bolts 39 inserted between the upper end outer peripheral surface and the upper end inner peripheral surface of the first packing case 11 were inserted into the bolt insertion holes 38 of the flange portion 10b. When the tightening nut 40 is tightened in the state, the cylindrical portion 10a is pushed down, and the gland packing 31A... . In the figure, 50 indicates a lock nut.

  The cylindrical portion 10a of the first packing presser 10 is provided with a deposit removing coil spring 41 that removes a deposit such as a liquid wrinkle or the like adhering to the inner peripheral surface thereof by breaking the spring 41 when necessary. The interior is compressed. That is, since the upper end opening of the cylindrical portion 10a of the first packing presser 10 forms the liquid supply port 27, the inner peripheral surface of the cylindrical portion 10a is repetitively used, such as a bowl of cement milk. If the adhesion layer becomes thick and the adhesion layer becomes thick, the liquid supply port 27 may be clogged. The adhering matter removing coil spring 41 breaks and removes adhering matter adhering to the inner peripheral surface of the cylindrical portion 10a. When tightening the gland packing 31A, the lock nut 50 below the flange portion 10b is loosened. When the tightening nut 40 is tightened, the coil spring 41 contracts, and the contraction of the coil spring 41 can break and remove the cement milk wrinkles and the like that have accumulated between the coil portions of the coil spring 41. The soot and the like removed by the coil spring 41 flows out to the liquid passage 16 side by a liquid such as cement milk supplied from the liquid supply port 27.

  Further, in the cylindrical portion 10a of the first packing presser 10, an upper side ring 42 that is relatively rotatable and overlaps with each other in a surface contact state between the lower end side of the coil spring 41 and the upper end side of the swivel shaft 8. And a lower ring 43 are interposed. In this way, the upper ring 42 that is in a surface contact state and is vertically rotatable and is relatively rotatable and in contact with the inner peripheral surface of the cylindrical portion 10 a, the upper side small diameter shaft portion 8 a of the swivel shaft 8, and the collar 23. A slip ring 44 comprising a lower ring 43 in contact with the upper end surface of the coil spring 41 is interposed between the lower end side of the coil spring 41 and the upper end side of the swivel shaft 8, so that the coil spring 41 is shared by the rotational force of the swivel shaft 8. Since it does not rotate, the upper and lower end contact surfaces of the coil spring 41 are not damaged.

  3, similarly to the first packing case 11, the second packing case 12 is provided with gland packings 31B in a plurality of upper and lower stages. An oil supply ring 32B provided with holes 32b at positions spaced in the direction is interposed, and the gland packing 31B... And the oil supply ring 32B are fitted and fixed to the lower-side large-diameter shaft portion 8b of the swivel shaft 8. The collar 24 is fitted in a relatively rotatable manner. An annular groove 33 having a shallow depth is formed on the outer peripheral surface of the second packing case 12, and a communication hole 34 that penetrates between the bottom surface of the groove 33 and the inner peripheral surface of the first packing case 11. Are provided, and the lower casing 13b is provided with a plurality of oil supply holes 35 penetrating in the thickness direction of the casing, and a stopper plug 36 is screwed to the outer end of each oil supply hole 35. The oil supply ring 32B interposed between the gland packings 31B in the second packing case 12 and the oil supply ring 32A interposed between the gland packings 31A in the first packing case 11 described above. It has the same function.

  And the 2nd packing presser 20 which clamps gland packing 31B ... in the 2nd packing case 12 to the axial direction upward from the lower step side is attached to the lower end part of the lower casing 13b of the cylindrical casing 13. As shown in FIG. As shown in FIG. 3, the second packing presser 20 has a cylindrical portion 20 a whose upper end is pressed against the lowermost gland packing 31 </ b> B and a lower end of the cylindrical portion 20 a so as to project a plurality of bolt insertion holes 38. The upper end portion of the cylindrical portion 20a is inserted between the outer peripheral surface of the collar 24 and the inner peripheral surface of the lower end portion of the second packing case 12, and is attached to the lower end surface of the lower casing 13b. The cylindrical portion 20a is pushed up by tightening the tightening nut 40 in a state where the plurality of fixing bolts 39 projecting from the bolt are inserted into the bolt insertion holes 38 of the flange portion 20b. Sealing is performed by applying a compressive force. In FIG. 3, reference numeral 45 denotes a bush fitted between the collar 24 and the cylindrical portion 20 a of the second packing presser 20, and is fixed to the flange portion 20 b of the second packing presser 20 by a bolt 46.

  5 (a) and 5 (b) includes a shaft portion 47 that is coaxially connected to the lower end portion of the excavation rod 5, and a plurality of protrusions that are projected from the shaft portion 47 in a plurality of stages. As shown in FIG. 5A, the shaft portions 47 and 47 of the two stirring blades 6 and 6 are spaced apart from each other by a space holding frame 49 fitted to the shaft portions 47 and 47 so as to be rotatable relative to each other. Are held at regular intervals. A drilling blade 51 is attached to the lower wing body 48. Both the excavating rods 5 and 5 are also held at a constant interval by a similar interval holding frame 53 as schematically shown in FIG.

  3 and 4, 54 is a thrust ring interposed between the upper end surface portion of the large-diameter shaft portion 8b of the swivel shaft 8 and the lower end surface portion of the upper casing 13a, and 55 is the inner periphery of the lower end portion of the upper casing 13a. This is a bush interposed between the surface and the outer peripheral surface of the upper end portion of the large-diameter shaft portion 8 b of the swivel shaft 8. Reference numeral 56 denotes a liquid leak for confirming a liquid leak from the packings 57 and 58 and the thrust ring 54 interposed between the upper casing 13a of the cylindrical casing 13, the first packing case 11 and the collar 23, respectively. This is a confirmation hole. If the leakage of the packings 57 and 58 and the thrust ring 54 is left without knowing, it is considered that the leaked liquid flows into the cylindrical casing 13b through the bush 55. Therefore, by providing the liquid leakage confirmation hole 56, when the liquid leakage occurs, the liquid leakage can be confirmed inside the hole 56, so that measures such as replacing the packings 57, 58 and the thrust ring 54 with new ones can be taken early. Can be implemented.

  When using the excavator as described above, the liquid supply port 27 of the first packing presser 10 which is the fixed side of the double swivel device 7 for supplying the liquid such as cement milk to the two positions of the excavating rod 5 is also fixed. Although not shown in the drawing, the end of the cement milk supply pipe is connected to the liquid supply port 37 of the cylindrical casing 13 on the side, and the rotation side of the swivel shaft 8 on the rotation side is connected to these liquid supply ports 27 and 37. When the cement milk is pressurized and supplied to the first fluid passage 16 and the second fluid passage 17, the cement milk from the first fluid passage 16 passes through one fluid passage in the excavation rod 5 (not shown). The cement milk from the second liquid passage 17 is discharged from the upper discharge port 21 of one liquid passage 18 in the shaft portion 47 of the stirring blade 6 and the other liquid passage in the excavation rod 5. Stir through the path (not shown) 6 becomes possible discharged from the lower discharge port 22 of the other liquid passageways 19 in the shaft portion 47 of the.

  The double swivel device 7 has a first packing case 11 fitted to the upper part of the cylindrical casing 13 fixed to the outer frame part 15 of the drive unit 1 on the outer periphery on the upper side of the swivel shaft 8. The first packing presser 10 is rotatably fitted to the upper end of the cylindrical casing 13 so that the gland packing 31A disposed in a plurality of upper and lower stages in the first packing case 11 is tightened in the axial direction from the upper stage side. A second packing case 12 fitted in the lower part of the cylindrical casing 13 is fitted to the outer periphery of the lower side of the swivel shaft 8 so as to be relatively rotatable, and a plurality of upper and lower stages are provided in the second packing case 12. A second packing presser 20 for fastening the gland packing 31 </ b> B disposed in the axial direction from the lower side is attached to the lower end portion of the cylindrical casing 13. The gland packings 31A and 31B of the first packing case 11 and the second packing case 12 are packed in the packing cases 11 and 12, respectively, and these packing cases 11 and 12 are fitted on the upper side and the lower side of the swivel shaft 8. The first packing presser 10 and the second packing presser 20 can be attached easily, and the gland packings 31A and 31B can be easily replaced. Further, the gland packing 31A, 31B is superior to the O-ring because the sealing function may be reduced in each case by tightening in the axial direction with the packing pressers 10, 20.

  The cylindrical portion 10a of the first packing presser 10 is compressed by an adhering material removing coil spring 41 that removes adhering material such as cement milk wrinkles adhering to the inner peripheral surface thereof by expanding and contracting the spring 41 when necessary. When the gland packing 31A is tightened, the coil spring 41 is removed by loosening the lock nut 50 on the lower side of the flange portion 10b and then tightening the tightening nut 40. Then, due to the contraction action, the cement milk wrinkles and the like accumulated and adhered between the coil portions of the coil spring 41 can be broken and removed.

  Further, the collars 23 and 24 are detachably fitted and fixed to the upper side and the lower side of the swivel shaft 8, respectively, and the first packing case 11 is placed on the outer periphery of the upper side collar 23 and the first packing case 11 is placed on the outer periphery of the lower side collar 24. Since the two packing cases 24 are relatively rotatably fitted, when the collars 23 and 24 are worn, only the collars 23 and 24 need to be replaced, and the swivel shaft 8 itself can be used as it is. It is very economical.

  The swivel device 7 according to the embodiment described above with reference to FIGS. 1 to 5 is a double swivel device in which a liquid such as cement milk is individually supplied to two portions of the excavating rod 5, but the swivel according to the present invention. The device 7 is a swivel device that supplies a liquid such as cement milk to only one portion of the excavating rod 5, for example, the swivel device in which the second liquid passage 17 in the swivel device 7 shown in FIG. This also applies to the device 7. In the swivel device 7 according to the above-described embodiment, the first packing case 11 and the second packing case 12 each have a plurality of ring-shaped gland packings 31 </ b> A and 31 </ b> B that are arranged in a plurality of upper and lower stages. However, one long packing may be packed in the packing cases 11 and 12 in a spiral shape.

DESCRIPTION OF SYMBOLS 1 Drive part 4 Output shaft 5 Excavation rod 6 Stirring blade 10 1st packing presser 11 1st packing case 12 2nd packing case 13 Cylindrical casing 15 Outer frame part 16 1st flow path 17 2nd flow path 20 2nd Packing retainer 23 Collar 24 Collar 31A Gran packing 31B on the first packing case side Gran packing 32A on the second packing case side Oil ring 32B on the first packing case side Oil ring 41 on the second packing case side Coil spring for removing deposits

Claims (7)

A swivel device for supplying a liquid such as cement milk to a drilling rod provided in a drive unit of an excavator and rotatably connected to the drive unit, and passing a liquid through an upper end of an output shaft of the drive unit A swivel shaft penetrating the passage is connected, and a packing case fixed to the outer frame portion of the drive unit is fitted to the outer periphery of the swivel shaft so as to be relatively rotatable, and is packed in the packing case. A packing presser that tightens the gland packing in the axial direction is attached to the upper end of the packing case. The packing presser has its lower end pressed against the upper end of the packing and its upper opening forms a liquid supply port so that the liquid can be swiveled. The cylindrical portion to be introduced into the liquid flow path is provided with an adhering matter removing coil spring that breaks and removes adhering matter such as liquid soot adhering to the inner peripheral wall by expanding and contracting the spring when necessary. Ri name and decorated in a contracted state,
In the cylindrical portion of the packing presser, the upper and lower ends of the adhering matter removing coil spring and the upper end side of the swivel shaft overlap with each other in a surface contact state so as to be relatively rotatable and in contact with the inner peripheral surface of the cylindrical portion. A swivel device for an excavator, comprising a slip ring comprising an upper ring and a lower ring in contact with the upper end surface of the swivel shaft .   The swivel device for an excavator according to claim 1, wherein a collar is detachably fitted and fixed to the swivel shaft, and the packing case is relatively fitted to the outer periphery of the collar.   The swivel device for an excavator according to claim 1 or 2, wherein an oil supply ring is interposed between gland packings arranged in a plurality of stages in the packing case.   A double swivel device for supplying a liquid such as cement milk to two portions of a drilling rod which is provided in a drive unit of an excavator and is rotatably connected to the drive unit, the output shaft of the drive unit A swivel shaft that penetrates the first and second liquid passages is connected to the upper end, and an upper portion inside the cylindrical casing fixed to the outer frame portion of the drive unit is connected to the upper outer periphery of the swivel shaft. The first packing case fitted into the first packing case is relatively rotatably fitted, and the gland packing packed in the first packing case is tightened in the axial direction from the upper end side of the first packing presser. The first packing presser has a cylindrical portion that has a lower end pressed against the upper end side of the packing and an upper end opening that forms a liquid supply port to introduce liquid into the first liquid passage of the swivel shaft. The cylindrical part is attached to the inner peripheral wall. A coil spring for removing deposits, which breaks and removes deposits such as liquid soot when necessary by expanding and contracting the spring, is installed in a compressed state, and the swivel shaft has a lower outer periphery fitted to the lower part of the cylindrical casing. The second packing case is fitted to the lower end of the cylindrical casing so that the second packing case is relatively rotatably fitted and the gland packing packed in the second packing case is axially tightened from the lower end side. An excavator swivel device in which a liquid supply port for introducing a liquid such as cement milk into the second liquid passage of the swivel shaft is provided in the cylindrical casing.   The cylindrical portion of the first packing presser includes an upper side ring and a lower side ring that overlap with each other between the lower end side of the coil spring and the upper end side of the swivel shaft in a surface contact state and are relatively rotatable. The swivel device for an excavator according to claim 4, wherein a slip ring is interposed.   The upper and lower sides of the swivel shaft are fitted and fixed so that the collar can be removed, and the first packing case is relatively positioned on the outer periphery of the upper collar, and the second packing case is relatively positioned on the outer periphery of the lower collar. The swivel device according to claim 4 or 5, wherein the swivel device is configured to be rotatably fitted.   The swivel device for an excavator according to any one of claims 4 to 6, wherein an oil supply ring is interposed between gland packings arranged in a plurality of stages in the first and second packing cases.

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