JPH08253925A - Swivel joint of working device - Google Patents
Swivel joint of working deviceInfo
- Publication number
- JPH08253925A JPH08253925A JP5620595A JP5620595A JPH08253925A JP H08253925 A JPH08253925 A JP H08253925A JP 5620595 A JP5620595 A JP 5620595A JP 5620595 A JP5620595 A JP 5620595A JP H08253925 A JPH08253925 A JP H08253925A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- casing
- hollow shaft
- inner hollow
- injection passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Joints Allowing Movement (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、スイベル継手に関する
ものであり、特に土壌改良機械に使用されるスイベル継
手に関するものである。尚、便宜上、以下の明細書中の
説明においては、土壌改良機械の先端側（撹拌翼、掘削
ヘッド等がある）を“前”とし、駆動装置側を“後”と
して説明を行う。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swivel joint, and more particularly to a swivel joint used in a soil improvement machine. For the sake of convenience, in the following description, the front side of the soil improvement machine (there are stirring blades, excavation heads, etc.) is referred to as “front” and the drive device side is referred to as “rear”.
【０００２】[0002]
【従来の技術】スイベル継手を含む作業装置の一例とし
て、土壌改良機械の全体図が図４に概略的に示されてい
る。この土壌改良機械は、先端の掘削ヘッド１１によっ
て、土壌を掘りながら、セメントミルク等の硬化材を供
給し、撹拌翼９によって既存の土（置土）と撹拌混合す
ることで、軟弱な土壌を固結させて強固にするものであ
る。即ち、駆動装置１の回転軸１ａが回転すると、スイ
ベル継手３を介して、外側管状軸５にその回転が伝達さ
れ、先端の撹拌翼９が回転する。また、内側軸７にも駆
動装置１の回転動力が伝達されているため、先端にある
掘削ヘッド１１が回転して土を掘り起こす。そして、ス
イベル継手に設けられた硬化材注入口から圧力下に注入
された硬化材が外側管状軸，内側軸間の隙間２１を通っ
て先端の硬化材吐出口１３から吐出されるため、掘削ヘ
ッド１１によって掘り起こされた軟弱土は、前記撹拌翼
９によって硬化材と混ぜ合わされ、硬化材の化学反応に
よって固結し固いパイルを形成していく。2. Description of the Related Art As an example of a working apparatus including a swivel joint, a general view of a soil improvement machine is schematically shown in FIG. This soil improving machine supplies a hardening material such as cement milk while excavating the soil by the excavation head 11 at the tip, and agitates and mixes with the existing soil (laying soil) by the agitating blade 9 to remove the soft soil. It is solidified and solidified. That is, when the rotary shaft 1a of the drive device 1 rotates, the rotation is transmitted to the outer tubular shaft 5 via the swivel joint 3, and the stirring blade 9 at the tip rotates. Further, since the rotational power of the drive device 1 is also transmitted to the inner shaft 7, the excavation head 11 at the tip rotates to excavate the soil. Then, the hardening material injected under pressure from the hardening material injection port provided in the swivel joint is discharged from the hardening material discharge port 13 at the tip through the gap 21 between the outer tubular shaft and the inner shaft. The soft soil excavated by 11 is mixed with the hardener by the stirring blades 9 and is solidified by the chemical reaction of the hardener to form a solid pile.
【０００３】このような土壌改良機械に用いられてきた
従来のスイベル継手３は、図５の部分断面図に示される
ように、支持柱１４により支持されたケーシング１５
と、ケーシング１５内に設けられた軸受１７を介して支
持される内側中空軸１９とからなり、内側中空軸１９内
に内側軸７が同心状に挿通されている。The conventional swivel joint 3 used in such a soil improving machine is, as shown in the partial sectional view of FIG. 5, a casing 15 supported by a support column 14.
And an inner hollow shaft 19 supported via a bearing 17 provided in the casing 15, and the inner shaft 7 is concentrically inserted into the inner hollow shaft 19.
【０００４】内側中空軸１９の一端（後端）には、キー
２９を介してフランジ２７ａが接続されていて、ボルト
等によって駆動装置１側の回転軸１ａのフランジ部分と
連結されている。一方、内側中空軸１９の他端（前端）
にあるフランジ２７ｂは、先端に撹拌翼９が取り付けら
れた外側管状軸５に連結されている。内側中空軸１９及
び外側管状軸５と内側軸７との間には、環状断面の隙間
２１が形成されている。ケーシング１５の所定位置に
は、隙間２１に硬化材を注入するための硬化材注入通路
２３と、その入口である硬化材注入口２３ａとが設けら
れており、硬化材注入通路２３は、ケーシング１５及び
内側中空軸１９を貫通して隙間２１に連通している。ま
た、前記の隙間２１は、先端にある前述の硬化材吐出口
１３に達している（図４参照）。さらに、ケーシング１
５と内側中空軸１９との間には、前記硬化材注入通路２
３を軸方向に挟んで、硬化材注入通路２３を通る硬化材
が外部に漏洩しないように、環状のパッキン２５が配設
されている。A flange 27a is connected to one end (rear end) of the inner hollow shaft 19 via a key 29, and is connected to a flange portion of the rotary shaft 1a on the drive unit 1 side by a bolt or the like. On the other hand, the other end (front end) of the inner hollow shaft 19
The flange 27b at is connected to the outer tubular shaft 5 having the stirring blade 9 attached to its tip. A gap 21 having an annular cross section is formed between the inner hollow shaft 19 and the outer tubular shaft 5 and the inner shaft 7. At a predetermined position of the casing 15, a hardening material injection passage 23 for injecting the hardening material into the gap 21 and a hardening material injection port 23a that is an inlet thereof are provided. And the inner hollow shaft 19 and penetrates into the gap 21. Further, the gap 21 reaches the above-mentioned curing material discharge port 13 at the tip (see FIG. 4). Furthermore, casing 1
5 and the inner hollow shaft 19 between the hardener injection passage 2
An annular packing 25 is provided so as to prevent the hardening material passing through the hardening material injection passage 23 from leaking to the outside by sandwiching 3 in the axial direction.
【０００５】[0005]
【発明が解決しようとする課題】土壌改良機械の従来の
スイベル継手では、前述したように、硬化材注入口より
注入された硬化材の漏洩を防止するため、硬化材注入通
路２３の前後にパッキン２５が設けられていた。しか
し、硬化材の注入に際しては圧力がかけられるため、パ
ッキン２５及び内側中空軸１９の摺動面間に硬化材が侵
入することがあり、内側中空軸の摺動面即ちパッキンシ
ール面が著しく摩耗損傷することがあった。この結果、
硬化材はケーシング１５と内側中空軸１９との間から前
方または後方のパッキン２５を通過して外部へ漏洩して
しまうため、先端部の撹拌翼９によって置土と硬化材と
を混ぜ合わせる際、好適な混合比が得られなくなるおそ
れがあった。In the conventional swivel joint of the soil improvement machine, as described above, in order to prevent the hardening material injected from the hardening material injection port from leaking, packing is provided before and after the hardening material injection passage 23. 25 were provided. However, since the pressure is applied during the injection of the hardening material, the hardening material may enter between the sliding surfaces of the packing 25 and the inner hollow shaft 19, and the sliding surface of the inner hollow shaft, that is, the packing seal surface is significantly worn. It was sometimes damaged. As a result,
Since the hardening material leaks to the outside from between the casing 15 and the inner hollow shaft 19 through the packing 25 on the front side or the rear side, when mixing the soil and the hardening material with the stirring blade 9 at the tip end, There is a possibility that a suitable mixing ratio cannot be obtained.
【０００６】さらに、土壌改良機械の作業中に、先端で
の撹拌翼９や、掘削ヘッド１１の回転振動がスイベル継
手３にも伝達されるが、従来のスイベル継手は、ケーシ
ング１５の後部側にのみ軸受１７を設けて、外側管状軸
５及び内側中空軸１９の円滑回転と振れ止めとを行う構
造であるため、前述した振動が軸受１７の前側にあるパ
ッキン２５に集中的に作用して損傷させ、パッキン自体
の平均寿命を大幅に低下させるだけでなく、内側中空軸
１９のパッキンシール面の摩耗損傷を加速することが知
られていた。また、損傷したパッキンを交換するにして
も、土壌改良機械を分解する必要があるため、作業効率
が大幅に低下する問題もある。Further, while the soil improvement machine is in operation, the rotational vibration of the stirring blade 9 at the tip and the excavating head 11 is transmitted to the swivel joint 3, but the conventional swivel joint is provided on the rear side of the casing 15. Since only the bearing 17 is provided and the outer tubular shaft 5 and the inner hollow shaft 19 are smoothly rotated and steady-stated, the above-mentioned vibration concentrates on the packing 25 on the front side of the bearing 17 and damages it. It has been known that not only the average life of the packing itself is significantly reduced, but also the wear damage of the packing seal surface of the inner hollow shaft 19 is accelerated. Further, even if the damaged packing is replaced, the soil improvement machine needs to be disassembled, which causes a problem that work efficiency is significantly reduced.
【０００７】従って、本発明の主な目的は、中空軸の摺
動面、即ちパッキンシール面の摩耗損傷が発生しにくい
スイベル継手を提供することにある。Therefore, a main object of the present invention is to provide a swivel joint in which the sliding surface of the hollow shaft, that is, the packing seal surface is less likely to be worn and damaged.
【０００８】[0008]
【課題を解決するための手段】上述の目的を達成するた
め、本発明のスイベル継手は、一端で駆動装置の回転軸
に接続され、他端で外側管状軸に接続されると共に、第
１の隙間に連通する第２の隙間を有して内側軸の周りに
配置される回転自在の内側中空軸と、該内側中空軸の周
囲に配置されたケーシングと、内側中空軸及びケーシン
グ間に配置された軸受装置と、前記第２の隙間に連通す
るようにケーシング及び内側中空軸を半径方向に貫いて
形成された低圧流体注入通路とを有するスイベル継手に
おいて、軸方向に関して低圧流体注入通路の両側でケー
シング及び内側中空軸の間に環状に開口するように、高
圧流体注入通路を該ケーシングに形成し、軸方向に関し
て高圧流体注入通路の各々の両側でケーシング及び内側
中空軸の間に第１、第２環状パッキンを配設した。To achieve the above object, a swivel joint according to the present invention is connected at one end to a rotary shaft of a drive device and at the other end to an outer tubular shaft and has a first A rotatable inner hollow shaft having a second clearance communicating with the clearance and arranged around the inner shaft, a casing arranged around the inner hollow shaft, and a space between the inner hollow shaft and the casing. A bearing device and a low pressure fluid injection passage formed through the casing and the inner hollow shaft in a radial direction so as to communicate with the second gap, a swivel joint is provided on both sides of the low pressure fluid injection passage in the axial direction. A high pressure fluid injection passage is formed in the casing so as to open annularly between the casing and the inner hollow shaft, and a first portion is provided between the casing and the inner hollow shaft on each side of the high pressure fluid injection passage in the axial direction. It was provided with a second annular packing.
【０００９】また、ケーシング及び内側中空軸の間に
は、軸方向に関して低圧流体注入通路から離間した位置
にある第２環状パッキンの各々を該低圧流体注入通路側
に付勢する弾性部材を配設してよい。さらに、土壌改良
機械のスイベル継手においては、低圧流体注入通路には
相対的に低圧の流体として硬化材を注入し、高圧流体注
入通路には相対的に高圧の流体として水を注入する。Further, between the casing and the inner hollow shaft, an elastic member for urging each of the second annular packings located at a position separated from the low pressure fluid injection passage in the axial direction toward the low pressure fluid injection passage side is arranged. You can do it. Further, in the swivel joint of the soil improvement machine, a hardening material is injected into the low pressure fluid injection passage as a relatively low pressure fluid, and water is injected into the high pressure fluid injection passage as a relatively high pressure fluid.
【００１０】請求項４に記載の本発明は、ケーシングの
端部近傍で内側中空軸及びケーシング間に１対の軸受を
配置し、該１対の軸受の間に、第２の隙間に連通するよ
うにケーシング及び内側中空軸を半径方向に貫いて形成
された流体注入通路と、軸方向に関して流体注入通路の
両側でケーシング及び内側中空軸の間に配設された環状
パッキンとを備える。According to a fourth aspect of the present invention, a pair of bearings is arranged between the inner hollow shaft and the casing near the end of the casing, and the pair of bearings communicates with the second gap. Thus, the fluid injection passage is formed so as to radially pass through the casing and the inner hollow shaft, and the annular packing is disposed between the casing and the inner hollow shaft on both sides of the fluid injection passage in the axial direction.
【００１１】[0011]
【作用】作業装置の駆動装置によって回転軸及び内側軸
が回転すると、一端が回転軸と接続する内側中空軸が回
転し、さらに内側中空軸の他端と接続する外側管状軸も
回転する。ケーシング及び内側中空軸を貫く低圧流体注
入通路から圧力下に注入された相対的に低圧の流体は、
第２の隙間、第１の隙間を通って先端まで供給される。
また、該低圧流体注入通路の両側にある高圧流体注入通
路からは、相対的に高圧の流体が圧力下に注入されてい
て、第１環状パッキンに作用している。そのため、前記
の低圧の流体が第１環状パッキンと内側中空軸との間に
浸入しそうになっても、前記の高圧の流体の方が、この
間を通って低圧流体注入通路に流入してくるため、低圧
の流体は、低圧流体注入通路から漏洩して第１環状パッ
キンと内側中空軸との間に浸入することはない。When the rotating shaft and the inner shaft are rotated by the drive device of the working device, the inner hollow shaft whose one end is connected to the rotating shaft is rotated, and the outer tubular shaft which is connected to the other end of the inner hollow shaft is also rotated. The relatively low pressure fluid injected under pressure from the low pressure fluid injection passage through the casing and the inner hollow shaft is
It is supplied to the tip through the second gap and the first gap.
Further, relatively high-pressure fluid is injected under pressure from the high-pressure fluid injection passages on both sides of the low-pressure fluid injection passage, and acts on the first annular packing. Therefore, even if the low-pressure fluid is about to enter between the first annular packing and the inner hollow shaft, the high-pressure fluid flows into the low-pressure fluid injection passage through this gap. The low-pressure fluid does not leak from the low-pressure fluid injection passage and enter between the first annular packing and the inner hollow shaft.
【００１２】また、高圧流体注入通路の片側にある第２
環状パッキンの各々を、低圧流体注入通路側に付勢する
弾性部材を設けておけば、第２環状パッキンが摩耗して
もシールに必要な圧力が確保され続ける。また、作業機
械が土壌改良機械として使用されるものであるときは、
低圧の流体として硬化材が、高圧の流体として水が供給
される。さらに、内側中空軸を支持する軸受をケーシン
グの両端に設けたものでは、軸受間にある環状パッキン
に、内側中空軸の回転に伴う有害な振動が実質的に伝わ
らないようになっている。Also, there is provided a second member on one side of the high pressure fluid injection passage.
If each of the annular packings is provided with an elastic member for urging the annular packing toward the low-pressure fluid injection passage, the pressure required for the sealing is maintained even if the second annular packing is worn. Also, when the work machine is used as a soil improvement machine,
A hardening material is supplied as a low-pressure fluid, and water is supplied as a high-pressure fluid. Further, in the case where the bearings supporting the inner hollow shaft are provided at both ends of the casing, harmful vibrations due to the rotation of the inner hollow shaft are substantially not transmitted to the annular packing between the bearings.
【００１３】[0013]
【実施例】本発明の好適な実施例について添付図面を参
照して詳細に説明するが、図中、同一符号は同一又は対
応部分を示すものとする。図１には、本発明に係るスイ
ベル継手の実施例を含む土壌改良機械（作業装置）の全
体図が示されている。図２には、本実施例のスイベル継
手の拡大部分断面図が示されている。尚、この土壌改良
機械は、スイベル継手以外の部分は従来のものと同一で
あるため、その部分の詳細な説明については省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts. FIG. 1 shows an overall view of a soil improvement machine (working apparatus) including an embodiment of a swivel joint according to the present invention. FIG. 2 shows an enlarged partial sectional view of the swivel joint of this embodiment. Since this soil improvement machine is the same as the conventional one except for the swivel joint, detailed description thereof will be omitted.
【００１４】土壌改良機械において、駆動装置１は、回
転軸１ａ及び内側軸７を回転させる動力源となってい
る。内側軸７は、スイベル継手１０３内を貫通して前後
方向に長く延びており、その先端には掘削ヘッド１１が
取り付け固定され、その基端は駆動装置１に接続してい
る。一方、回転軸１ａのフランジ部分は、スイベル継手
１０３側の一端に連結されており、その他端は、外側管
状軸５のフランジ部分に連結されている。スイベル継手
１０３は、土壌改良機械の駆動装置１と外側管状軸５と
の間に位置し、中空軸の部分において両者を連結してい
る。さらに、外側管状軸５の先端には撹拌翼９が取り付
け固定されている。外側管状軸５と内側軸７との間に形
成された隙間２１は、先端にある硬化材吐出口１３に連
通している。In the soil improvement machine, the drive unit 1 serves as a power source for rotating the rotary shaft 1a and the inner shaft 7. The inner shaft 7 penetrates through the swivel joint 103 and extends long in the front-rear direction. The excavation head 11 is attached and fixed to the tip end of the inner shaft 7, and the base end thereof is connected to the drive device 1. On the other hand, the flange portion of the rotary shaft 1a is connected to one end on the swivel joint 103 side, and the other end is connected to the flange portion of the outer tubular shaft 5. The swivel joint 103 is located between the drive device 1 of the soil improvement machine and the outer tubular shaft 5, and connects the two at the hollow shaft portion. Further, a stirring blade 9 is attached and fixed to the tip of the outer tubular shaft 5. The gap 21 formed between the outer tubular shaft 5 and the inner shaft 7 communicates with the hardening material discharge port 13 at the tip.
【００１５】次に、スイベル継手１０３について詳細に
説明する。図２のスイベル継手１０３は、主に、支持柱
１１４により支持された中空のケーシング１１５と内側
中空軸１１９とからなる。内側軸７は、内側中空軸１１
９の中空部分内に部分的に遊挿されると共に、内側中空
軸１１９を貫通して前後方向に長く延びている。内側軸
７と内側中空軸１１９との径方向の間には、環状断面の
隙間１２２（以下、第２の隙間と称す）が形成されてい
る。この第２の隙間１２２は、実質的に、後述する硬化
材注入通路（低圧流体注入通路）１２３よりも前方の部
分で形成されており、内側軸７と外側管状軸５との径方
向の間にも同様な環状断面の隙間１２１（以下、第１の
隙間と称す）が形成されており、先端の硬化材吐出口１
３に連通している。外側管状軸５及び内側中空軸１１９
の円滑回転と振れ止めとを行うために、ケーシング１１
５の前後方向の各端に配設された軸受１１７によって内
側中空軸１１９が回転可能に支持されている。内側中空
軸１１９の後端部には、螺合によりフランジ１２７ａが
接続されており、フランジ１２７ａは、上述した回転軸
１ａのフランジ部分にボルト等の手段によって連結され
ている。一方、内側中空軸１１９の前端部には、同様な
接続態様によってフランジ１２７ｂが接続されており、
フランジ１２７ｂは、外側管状軸５のフランジ部分にボ
ルト等の手段によって連結されている。Next, the swivel joint 103 will be described in detail. The swivel joint 103 in FIG. 2 mainly includes a hollow casing 115 supported by a support column 114 and an inner hollow shaft 119. The inner shaft 7 is an inner hollow shaft 11
9 is partially loosely inserted in the hollow portion and penetrates the inner hollow shaft 119 to extend in the front-rear direction. A gap 122 (hereinafter, referred to as a second gap) having an annular cross section is formed between the inner shaft 7 and the inner hollow shaft 119 in the radial direction. The second gap 122 is substantially formed in a portion in front of a hardening material injection passage (low-pressure fluid injection passage) 123 described later, and is located between the inner shaft 7 and the outer tubular shaft 5 in the radial direction. A similar gap 121 having an annular cross section (hereinafter, referred to as a first gap) is also formed in the hardened material discharge port 1 at the tip.
It communicates with 3. Outer tubular shaft 5 and inner hollow shaft 119
In order to perform smooth rotation and steady rest of the casing 11,
The inner hollow shaft 119 is rotatably supported by bearings 117 arranged at the respective ends of the No. 5 in the front-rear direction. A flange 127a is connected to the rear end of the inner hollow shaft 119 by screwing, and the flange 127a is connected to the flange portion of the rotary shaft 1a described above by means such as a bolt. On the other hand, a flange 127b is connected to the front end portion of the inner hollow shaft 119 by a similar connection mode,
The flange 127b is connected to the flange portion of the outer tubular shaft 5 by means of bolts or the like.
【００１６】ケーシング１１５の内部もしくは内側に
は、前記軸受１１７の他に、硬化材注入通路１２３，第
１環状パッキン１２５，水注入通路１３１，第２環状パ
ッキン１３３及び皿ばね１３５等が設けられている。ま
ず、二つの軸受１１７のほぼ中央の位置には、硬化材注
入通路１２３が設けられていて、硬化材供給源（図示せ
ず）に接続される硬化材注入口１２３ａはケーシング１
１５の外形よりも突出している。硬化材注入通路１２３
は、ケーシング１１５を貫通し、さらに内側中空軸１１
９も貫通して、第２の隙間１２２に連通している。本実
施例では、硬化材注入通路１２３の数は、円周方向に約
９０゜離間した３つの位置に１つずつ合計３つである
が、本発明はこれに限定されるものではない。Inside or inside the casing 115, in addition to the bearing 117, a hardening material injection passage 123, a first annular packing 125, a water injection passage 131, a second annular packing 133 and a disc spring 135 are provided. There is. First, a hardener injection passage 123 is provided at a substantially central position of the two bearings 117, and the hardener injection port 123a connected to a hardener supply source (not shown) is the casing 1.
It projects more than the outer shape of 15. Curing material injection passage 123
Penetrates the casing 115, and further, the inner hollow shaft 11
9 also penetrates and communicates with the second gap 122. In the present embodiment, the number of the hardening material injection passages 123 is three in total, one at each of the three positions which are separated by about 90 ° in the circumferential direction, but the present invention is not limited to this.
【００１７】また、硬化材注入通路１２３の直ぐ前後両
側には、ケーシング１１５と内側中空軸１１９との間に
硬化材注入通路１２３から浸出した硬化材が同硬化材注
入通路に関してさらに外方（前後方向）に漏洩しないよ
うに、ケーシング１１５の内周面に形成された溝に嵌合
する、例えばＯリングのような環状の第１環状パッキン
１２５が補助的に配設されている。尚、本実施例のスイ
ベル継手１０３は、図２から分かるように、硬化材注入
通路１２３を中心に前後対称であるため、以下の説明は
硬化材注入通路１２３より前方について行う。On both front and rear sides of the hardener injection passage 123, the hardener leached from the hardener injection passage 123 between the casing 115 and the inner hollow shaft 119 is further outward (front and rear) with respect to the hardener injection passage. A first annular packing 125 having an annular shape such as an O-ring, which is fitted in a groove formed on the inner peripheral surface of the casing 115, is additionally provided so as not to leak in the direction). As can be seen from FIG. 2, the swivel joint 103 of the present embodiment is symmetrical with respect to the hardening material injection passage 123, and therefore the following description will be made in front of the hardening material injection passage 123.
【００１８】第１環状パッキン１２５の前方には、注入
口１３１ａがケーシング１１５の外周面に開口した水注
入通路（高圧流体注入通路）１３１が設けられている。
図３には、水注入通路１３１を通る図２のIII−III線に
沿って切断した図が示されている。水注入通路１３１
は、ケーシング１１５と内側中空軸１１９との間に形成
されている環状の空間部分１３１ｂと、注入口１３１ａ
から前記空間部分１３１ｂまで延びる管部分１３１ｃと
からなる。本実施例の注入口１３１ａは、一カ所だけに
しか設けられていないが、注入口１３１ａの数及び向き
は、硬化材注入口１２３ａの場合と同様に、本実施例の
みに限定されるものではない。この注入口から注入され
た硬化材よりも相対的に圧力の高い流体（実際には、
“水”を使用）等は、前記の環状の空間部分１３１ｂに
充満していて、ケーシング１１５と内側中空軸１１９と
の間から、前後方向に少しずつ漏れ出していく。In front of the first annular packing 125, a water injection passage (high-pressure fluid injection passage) 131 having an injection opening 131a opened to the outer peripheral surface of the casing 115 is provided.
FIG. 3 shows a view taken along line III-III of FIG. 2 passing through the water injection passage 131. Water injection passage 131
Is an annular space portion 131b formed between the casing 115 and the inner hollow shaft 119, and an inlet 131a.
To the space portion 131b from the pipe portion 131c. Although the injection port 131a of this embodiment is provided only at one place, the number and direction of the injection ports 131a are not limited to this embodiment as in the case of the curing material injection port 123a. Absent. A fluid with a relatively higher pressure than the hardener injected from this inlet (actually,
"Using water" etc. is filled in the annular space portion 131b, and leaks little by little in the front-rear direction from between the casing 115 and the inner hollow shaft 119.
【００１９】また、水注入通路１３１の前方には、通常
のものでよいグランドパッキン、即ち第２環状パッキン
１３３が配設されている。第２環状パッキン１３３は、
水注入通路１３１に注入された水が、第１環状パッキン
１２５とは逆の前方へ漏れることを防止している。In addition, a normal gland packing, that is, a second annular packing 133 is disposed in front of the water injection passage 131. The second annular packing 133 is
The water injected into the water injection passage 131 is prevented from leaking to the front opposite to the first annular packing 125.
【００２０】さらに前方には、第２環状パッキン１３３
と軸受１１７との間に、パッキン押さえ１３７、複数の
皿ばね１３５及びスリーブ１３９が配設されている。皿
ばね１３５は、内側中空軸１１９の外径とほぼ同径の穴
を有する皿形のばねであり、一つの皿ばね１３５の外周
端は、隣接する皿ばね１３５の外周端と当接し、内周端
は、隣接する皿ばね１３５の内周端と当接するような態
様で、内側中空軸１１９の外周面に沿って前後方向に複
数配設されている。皿ばね１３５とケーシング１１５と
の間には環状のスリーブ１３９が設けられ、皿ばね１３
５と第２環状パッキン１３３との間には、皿ばね１３５
の圧縮力が第２環状パッキン１３３に対し均一に伝わる
ように、環状のパッキン押さえ１３７が配設されてい
る。皿ばね１３５は、図２に示される組み上がった状態
において、無負荷状態よりも圧縮されているため、第２
環状パッキン１３３に対し、パッキン押さえ１３７を介
して、常に圧縮力を弾性的に負荷しており、第２環状パ
ッキン１３３が摩耗しても圧縮によりその径を増大させ
て常に十分な密封力が得られるようになっている。ケー
シング１１５の前後端には、軸受１１７を押さえると共
に、同前後端を閉塞する端蓋１４３が取り付けられてい
る。また、端蓋１４３と内側中空軸１１９との間には、
内側中空軸１１９の回転に備えて環状のブッシュ１４１
が配設されている。Further to the front, a second annular packing 133 is provided.
A packing retainer 137, a plurality of disc springs 135, and a sleeve 139 are disposed between and the bearing 117. The disc spring 135 is a disc-shaped spring having a hole having substantially the same diameter as the outer diameter of the inner hollow shaft 119. The outer peripheral end of one disc spring 135 abuts on the outer peripheral end of an adjacent disc spring 135, A plurality of peripheral ends are arranged in the front-rear direction along the outer peripheral surface of the inner hollow shaft 119 so as to contact the inner peripheral ends of the adjacent disc springs 135. An annular sleeve 139 is provided between the disc spring 135 and the casing 115.
5 and the second annular packing 133 between the disc spring 135
The ring-shaped packing retainer 137 is arranged so that the compression force of 1 is uniformly transmitted to the second ring-shaped packing 133. The disc spring 135 is compressed more than the unloaded state in the assembled state shown in FIG.
A compression force is constantly elastically applied to the annular packing 133 via the packing retainer 137, and even if the second annular packing 133 is worn, its diameter is increased by compression and a sufficient sealing force is always obtained. It is designed to be used. At the front and rear ends of the casing 115, end caps 143 that press the bearing 117 and close the front and rear ends are attached. Further, between the end cover 143 and the inner hollow shaft 119,
An annular bush 141 for the rotation of the inner hollow shaft 119
Is provided.
【００２１】次に、本実施例のスイベル継手１０３を含
む土壌改良機械の動作について説明する。駆動装置１が
作動すると、回転軸１ａ及び内側軸７は所定の方向に回
転する。内側軸７の回転は、スイベル継手１０３及び外
側管状軸５等の他の部材に伝達されることなく、直接、
先端まで伝達され、掘削ヘッド１１を回転させる。一
方、回転軸１ａの回転は、ボルト等によって連結された
フランジ１２７ａに伝達され、キーを介して内側中空軸
１１９に、さらに前側の端にあるキーを介してフランジ
１２７ｂに伝達され、外側管状軸５、及びその先端にあ
る撹拌翼９を回転させる。その際、内側中空軸１１９は
ケーシング１１５の各端に位置する２ケ所の軸受１１７
で支持されているので、内側中空軸１１９の振れ止めが
効果的に行われ、軸受１１７の間の該部材には、内側中
空軸１１９の回転に伴う有害な振動は実質的に伝わらな
い。Next, the operation of the soil improvement machine including the swivel joint 103 of this embodiment will be described. When the drive device 1 operates, the rotary shaft 1a and the inner shaft 7 rotate in a predetermined direction. The rotation of the inner shaft 7 is directly transmitted without being transmitted to other members such as the swivel joint 103 and the outer tubular shaft 5.
It is transmitted to the tip, and the excavation head 11 is rotated. On the other hand, the rotation of the rotating shaft 1a is transmitted to a flange 127a connected by a bolt or the like, is transmitted to the inner hollow shaft 119 via a key, and is further transmitted to the flange 127b via a key at the front end, thereby being connected to the outer tubular shaft. 5 and the stirring blade 9 at the tip thereof are rotated. At this time, the inner hollow shaft 119 has two bearings 117 located at each end of the casing 115.
Since the inner hollow shaft 119 is effectively supported by, the steady vibration of the inner hollow shaft 119 is effectively performed, and the harmful vibration accompanying the rotation of the inner hollow shaft 119 is substantially not transmitted to the member between the bearings 117.
【００２２】駆動装置１の動作とは別に、硬化材注入通
路１２３には、相対的に低圧の硬化材が流し込まれ、第
２の隙間１２２及び第１の隙間１２１を通って先端の硬
化材吐出口１３に供給される。これによって、前述の掘
削ヘッド１１によって掘り起こされた土は、前述の撹拌
翼９の回転によって硬化材と混ぜ合わされる。また、硬
化材注入通路１２３の前後の水注入通路１３１には、硬
化材に混入しても悪影響がなく、しかもパッキン及び内
側中空軸の摺動面間に浸入してもパッキンシール面に悪
影響のない流体（本実施例では水）が、硬化材の圧力よ
りも相対的に高い圧力で常に注入され続けており、内側
中空軸１１９と第１環状パッキン１２５との間を通って
少しずつ硬化材注入通路１２３内に浸入し続けている。
このため、硬化材は、自身よりも圧力の高い水に勝って
第１環状パッキン１２５に対する内側中空軸のシール面
に浸出することができないので、硬化材注入通路１２３
の途中から漏洩することが防止されている。In addition to the operation of the drive unit 1, a relatively low-pressure hardening material is poured into the hardening material injection passage 123, passes through the second gap 122 and the first gap 121, and the hardening material is discharged at the tip. It is supplied to the outlet 13. As a result, the soil excavated by the excavation head 11 is mixed with the hardened material by the rotation of the stirring blade 9 described above. Further, in the water injection passage 131 before and after the hardening material injection passage 123, there is no adverse effect even if mixed into the hardening material, and even if it penetrates between the sliding surfaces of the packing and the inner hollow shaft, it does not adversely affect the packing seal surface. The fluid (water in this embodiment) that is not present is constantly injected at a pressure relatively higher than the pressure of the hardening material, and gradually passes between the inner hollow shaft 119 and the first annular packing 125 to gradually harden the hardening material. It continues to enter the injection passage 123.
For this reason, the hardening material cannot withstand water having a higher pressure than itself, and can not leach out to the sealing surface of the inner hollow shaft with respect to the first annular packing 125.
It is prevented from leaking from the middle of.
【００２３】[0023]
【発明の効果】以上説明したように、請求項１に記載の
本発明のスイベル継手によれば、低圧流体注入通路の両
側でケーシング及び内側中空軸の間に環状に開口するよ
うに前記ケーシングに形成された高圧流体注入通路と、
高圧流体注入通路の各々の両側でケーシング及び内側中
空軸の間に配設された第１及び第２環状パッキンとを備
えているため、高圧の流体が第１環状パッキンと内側中
空軸との間を塞ぐので、低圧の流体が第２環状パッキン
（グランドパッキン）に到達することを防ぎ、第１，第
２環状パッキンと当接する内側中空軸のシール面を著し
く摩耗損傷することが防止される。As described above, according to the swivel joint of the present invention as set forth in claim 1, the casing is formed so as to open annularly between the casing and the inner hollow shaft on both sides of the low pressure fluid injection passage. A high pressure fluid injection passage formed,
Since the first and second annular packings are provided between the casing and the inner hollow shaft on both sides of each of the high-pressure fluid injection passages, the high-pressure fluid flows between the first annular packing and the inner hollow shaft. Since the low pressure fluid is prevented from reaching the second annular packing (gland packing), it is prevented that the sealing surface of the inner hollow shaft that abuts against the first and second annular packings is significantly worn and damaged.
【００２４】請求項２に記載のスイベル継手によれば、
低圧流体注入通路から離間した位置にある第２環状パッ
キンの各々を低圧流体注入通路側に付勢する、弾性部材
を配設し、弾性部材によって第２環状パッキンは常に圧
縮されているため、内側中空軸との摺動面が摩耗して
も、前記の圧縮によって径方向に膨らむことで摺動面の
シールに必要な面圧が確保され、第２環状パッキンと内
側中空軸との間から高圧の流体が漏洩することが防止さ
れる。According to the swivel joint of claim 2,
An elastic member is provided for urging each of the second annular packings spaced apart from the low-pressure fluid injection passage toward the low-pressure fluid injection passage, and the second annular packing is always compressed by the elastic member. Even if the sliding surface with the hollow shaft wears, the surface pressure necessary for sealing the sliding surface is secured by expanding in the radial direction due to the above-mentioned compression, and high pressure is applied between the second annular packing and the inner hollow shaft. Of the fluid is prevented from leaking.
【００２５】請求項３に記載のスイベル継手によれば、
土壌改良機械に用いるときに、低圧流体注入通路に注入
される相対的に低圧の流体として硬化材が供給され、高
圧流体注入通路に注入される相対的に高圧の流体として
水が供給されるため、硬化材に水が混入しても、親和性
が良いので問題がなく、また、セメントミルク等のスラ
リーが浸入していたときのグランドパッキンの寿命に比
べて、第２環状パッキンの寿命が１０倍以上向上する。According to the swivel joint of claim 3,
When used in a soil improvement machine, the hardening material is supplied as a relatively low-pressure fluid injected into the low-pressure fluid injection passage, and water is supplied as a relatively high-pressure fluid injected into the high-pressure fluid injection passage. Also, even if water is mixed in the hardening material, there is no problem because the affinity is good, and the life of the second annular packing is 10 times as long as the life of the gland packing when the slurry such as cement milk is infiltrated. More than double.
【００２６】請求項４に記載のスイベル継手によれば、
ケーシングの端部近傍で内側中空軸及びケーシング間に
配置された１対の軸受の間に、第２の隙間に連通するよ
うにケーシング及び内側中空軸を半径方向に貫いて形成
された流体注入通路と、軸方向に関して流体注入通路の
両側でケーシング及び内側中空軸の間に配設された環状
パッキンとを設けたため、先端の掘削部分からの回転振
動が環状パッキンに集中することによる、環状パッキン
自体の使用寿命の低下や、内側中空軸のパッキンシール
面の摩耗損傷の加速を防止できる。According to the swivel joint of claim 4,
A fluid injection passage formed radially through the casing and the inner hollow shaft so as to communicate with the second gap between a pair of bearings arranged between the inner hollow shaft and the casing near the end of the casing. And the annular packing disposed between the casing and the inner hollow shaft on both sides of the fluid injection passage in the axial direction, the rotational vibration from the excavated portion at the tip is concentrated on the annular packing, so that the annular packing itself. It is possible to prevent the service life from declining and accelerating the wear damage of the packing seal surface of the inner hollow shaft.
【００２７】請求項５に記載のスイベル継手によれば、
ケーシングの端部近傍で内側中空軸及びケーシング間に
配置された１対の軸受と、該１対の軸受の間で第２の隙
間に連通するようにケーシング及び内側中空軸を半径方
向に貫いて形成された低圧硬化材注入通路と、軸方向に
関して低圧硬化材注入通路の両側でケーシング及び内側
中空軸の間に環状に開口するようにケーシングに形成さ
れた高圧水注入通路と、軸方向に関して高圧水注入通路
の各々の両側でケーシング及び内側中空軸の間に配設さ
れた第１、第２環状パッキンと、該第２環状パッキンの
各々を前記低圧硬化材注入通路側に付勢する弾性部材と
を備え、前記１対の軸受の間に、前記低圧硬化材注入通
路と、前記高圧水注入通路と、前記第１、第２環状パッ
キンと、前記弾性部材とが配設されているため、請求項
１〜４の発明による全効果を奏し、具体的には、図５に
示した従来のスイベル継手の連続運転可能な平均時間が
４０〜５０時間であるのに対して、３００時間以上の連
続運転が可能となり、土壌改良工事１件あたりの平均工
事期間である約１カ月の間、メンテナンスを省略できる
ので、工事期間を大幅に短縮することができる。According to the swivel joint of claim 5,
A pair of bearings arranged between the inner hollow shaft and the casing in the vicinity of the end of the casing, and the casing and the inner hollow shaft in the radial direction so as to communicate with the second gap between the pair of bearings. A low-pressure hardening material injection passage formed, a high-pressure water injection passage formed in the casing so as to open annularly between the casing and the inner hollow shaft on both sides of the low-pressure hardening material injection passage in the axial direction, and a high pressure in the axial direction. First and second annular packings arranged between the casing and the inner hollow shaft on both sides of each water injection passage, and an elastic member for urging each of the second annular packings toward the low-pressure curing material injection passage. And the low pressure hardening material injection passage, the high pressure water injection passage, the first and second annular packings, and the elastic member are arranged between the pair of bearings. According to the invention of claims 1 to 4, With all the effects, specifically, the conventional swivel joint shown in FIG. 5 has an average time of 40 to 50 hours that can be continuously operated, whereas continuous operation of 300 hours or more is possible, and soil improvement is possible. Since the maintenance can be omitted for about one month, which is the average construction period for each construction, the construction period can be significantly shortened.
【図１】 本発明の実施例によるスイベル継手を含む土
壌改良機械の全体概略図である。1 is an overall schematic view of a soil improvement machine including a swivel joint according to an embodiment of the present invention.
【図２】 図１の土壌改良機械におけるスイベル継手を
拡大し、その上半分について断面で、下半分について側
面で示した拡大部分断面図である。FIG. 2 is an enlarged partial sectional view showing a swivel joint in the soil improvement machine of FIG. 1 in an enlarged manner, showing a cross section of an upper half thereof and a side surface of a lower half thereof.
【図３】 高圧水注入通路を通る図２のIII−III線に沿
って切断した部分断面図である。FIG. 3 is a partial cross-sectional view taken along line III-III of FIG. 2 which passes through a high pressure water injection passage.
【図４】 従来のスイベル継手を含む土壌改良機械の全
体図である。FIG. 4 is an overall view of a soil improvement machine including a conventional swivel joint.
【図５】 図４のスイベル継手を拡大し、上半分を断面
で示した拡大部分断面図である。5 is an enlarged partial cross-sectional view showing the swivel joint of FIG. 4 in an enlarged manner and showing an upper half in section.
１…駆動装置、１ａ…回転軸、５…外側管状軸、７…内
側軸、１１５…ケーシング、１１７…軸受（軸受装
置）、１１９…内側中空軸、１２１…第１の隙間、１２
２…第２の隙間、１２３…硬化材注入通路（低圧流体注
入通路，流体注入通路）、１２５…第１環状パッキン、
１３１…水注入通路（高圧流体注入通路）、１３３…第
２環状パッキン、１３５…皿ばね（弾性部材）。DESCRIPTION OF SYMBOLS 1 ... Driving device, 1a ... Rotating shaft, 5 ... Outer tubular shaft, 7 ... Inner shaft, 115 ... Casing, 117 ... Bearing (bearing device), 119 ... Inner hollow shaft, 121 ... First gap, 12
2 ... second gap, 123 ... hardening material injection passage (low-pressure fluid injection passage, fluid injection passage), 125 ... first annular packing,
131 ... Water injection passage (high-pressure fluid injection passage), 133 ... Second annular packing, 135 ... Disc spring (elastic member).
Claims (5)
半径方向に第１の隙間を有して回転自在に配置される外
側管状軸と、前記内側軸及び前記外側管状軸を駆動する
ための駆動装置とを有する作業装置のスイベル継手であ
って、一端で前記駆動装置の回転軸に接続され、他端で
前記外側管状軸に接続されると共に、前記第１の隙間に
連通する第２の隙間を有して前記内側軸の周りに配置さ
れる回転自在の内側中空軸と、該内側中空軸の周囲に配
置されたケーシングと、前記内側中空軸及び前記ケーシ
ング間に配置された軸受装置と、前記第２の隙間に連通
するように前記ケーシング及び前記内側中空軸を半径方
向に貫いて形成された低圧流体注入通路と、軸方向に関
して該低圧流体注入通路の両側で前記ケーシング及び前
記内側中空軸の間に環状に開口するように前記ケーシン
グに形成された高圧流体注入通路と、軸方向に関して該
高圧流体注入通路の各々の両側で前記ケーシング及び前
記内側中空軸の間に配設された第１、第２環状パッキン
とを備えるスイベル継手。1. A rotatable inner shaft, an outer tubular shaft rotatably disposed around the inner shaft with a first clearance in the radial direction, and driving the inner shaft and the outer tubular shaft. A swivel joint of a working device having a drive device for connecting to the rotary shaft of the drive device at one end, connected to the outer tubular shaft at the other end, and communicating with the first gap. A rotatable inner hollow shaft arranged around the inner shaft with a second gap, a casing arranged around the inner hollow shaft, and arranged between the inner hollow shaft and the casing. A bearing device, a low-pressure fluid injection passage formed by radially penetrating the casing and the inner hollow shaft so as to communicate with the second gap, and the casing on both sides of the low-pressure fluid injection passage in the axial direction, Between the inner hollow shaft A high-pressure fluid injection passage formed in the casing so as to open in an annular shape, and first and second first and second passages arranged between the casing and the inner hollow shaft on both sides of each of the high-pressure fluid injection passage in the axial direction. Swivel joint with annular packing.
に配設され、軸方向に関して前記低圧流体注入通路から
離間した位置にある前記第２環状パッキンの各々を該低
圧流体注入通路側に付勢する弾性部材を備えた請求項１
に記載のスイベル継手。2. The second annular packing, which is disposed between the casing and the inner hollow shaft and is spaced apart from the low pressure fluid injection passage in the axial direction, is urged toward the low pressure fluid injection passage side. An elastic member for
Swivel joint described in.
に注入される相対的に低圧の流体として硬化材を供給さ
れ、前記高圧流体注入通路に注入される相対的に高圧の
流体として水を供給される土壌改良機械である請求項１
又は２に記載のスイベル継手。3. The working device is supplied with a hardening material as a relatively low-pressure fluid injected into the low-pressure fluid injection passage, and water as a relatively high-pressure fluid injected into the high-pressure fluid injection passage. A soil improvement machine to be supplied.
Or the swivel joint according to 2.
半径方向に第１の隙間を有して回転自在に配置される外
側管状軸と、前記内側軸及び前記外側管状軸を駆動する
ための駆動装置とを有する作業装置のスイベル継手であ
って、一端で前記駆動装置の回転軸に接続され、他端で
前記外側管状軸に接続されると共に、前記第１の隙間に
連通する第２の隙間を有して前記内側軸の周りに配置さ
れる回転自在の内側中空軸と、該内側中空軸の周囲に配
置されたケーシングと、該ケーシングの端部近傍で前記
内側中空軸及び前記ケーシング間に配置された１対の軸
受と、該１対の軸受の間で前記第２の隙間に連通するよ
うに前記ケーシング及び前記内側中空軸を半径方向に貫
いて形成された流体注入通路と、軸方向に関して該流体
注入通路の両側で前記ケーシング及び前記内側中空軸の
間に配設された環状パッキンとを備えるスイベル継手。4. A rotatable inner shaft, an outer tubular shaft rotatably disposed around the inner shaft with a first clearance in the radial direction, and driving the inner shaft and the outer tubular shaft. A swivel joint of a working device having a drive device for connecting to the rotary shaft of the drive device at one end, connected to the outer tubular shaft at the other end, and communicating with the first gap. A rotatable inner hollow shaft arranged around the inner shaft with a second gap, a casing arranged around the inner hollow shaft, and the inner hollow shaft near the end of the casing. A pair of bearings arranged between the casings, and a fluid injection passage formed through the casing and the inner hollow shaft in a radial direction so as to communicate with the second gap between the pair of bearings. And on both sides of the fluid injection passage in the axial direction A swivel joint comprising a casing and an annular packing arranged between the inner hollow shaft.
半径方向に第１の隙間を有して回転自在に配置される外
側管状軸と、前記内側軸及び前記外側管状軸を駆動する
ための駆動装置とを有する土壌改良機械のスイベル継手
であって、一端で前記駆動装置の回転軸に接続され、他
端で前記外側管状軸に接続されると共に、前記第１の隙
間に連通する第２の隙間を有して前記内側軸の周りに配
置される回転自在の内側中空軸と、該内側中空軸の周囲
に配置されたケーシングと、該ケーシングの端部近傍で
前記内側中空軸及び前記ケーシング間に配置された１対
の軸受と、該１対の軸受の間で前記第２の隙間に連通す
るように前記ケーシング及び前記内側中空軸を半径方向
に貫いて形成された低圧硬化材注入通路と、軸方向に関
して該低圧硬化材注入通路の両側で前記ケーシング及び
前記内側中空軸の間に環状に開口するように前記ケーシ
ングに形成された高圧水注入通路と、軸方向に関して該
高圧水注入通路の各々の両側で前記ケーシング及び前記
内側中空軸の間に配設された第１、第２環状パッキン
と、該第２環状パッキンの各々を前記低圧硬化材注入通
路側に付勢する弾性部材とを備え、前記１対の軸受の間
に、前記低圧硬化材注入通路と、前記高圧水注入通路
と、前記第１、第２環状パッキンと、前記弾性部材とが
配設されるスイベル継手。5. A rotatable inner shaft, an outer tubular shaft rotatably disposed around the inner shaft with a first clearance in a radial direction, and driving the inner shaft and the outer tubular shaft. A swivel joint of a soil improvement machine having a drive device for connecting to a rotary shaft of the drive device at one end, connected to the outer tubular shaft at the other end, and communicating with the first gap. A rotatable inner hollow shaft arranged around the inner shaft with a second gap, a casing arranged around the inner hollow shaft, and the inner hollow shaft near the end of the casing. And a pair of bearings arranged between the casings, and low pressure hardening formed by radially penetrating the casing and the inner hollow shaft so as to communicate with the second gap between the pair of bearings. Material injection passage and injection of the low-pressure hardening material in the axial direction High-pressure water injection passages formed in the casing so as to open annularly between the casing and the inner hollow shaft on both sides of the inlet passage, and the casing and the casing on both sides of each high-pressure water injection passage in the axial direction. The first and second annular packings arranged between the inner hollow shafts and the elastic member for urging each of the second annular packings toward the low-pressure hardening material injection passage side are provided. A swivel joint in which the low-pressure hardening material injection passage, the high-pressure water injection passage, the first and second annular packings, and the elastic member are disposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05620595A JP3669001B2 (en) | 1995-03-15 | 1995-03-15 | Swivel fitting for working equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05620595A JP3669001B2 (en) | 1995-03-15 | 1995-03-15 | Swivel fitting for working equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08253925A true JPH08253925A (en) | 1996-10-01 |
| JP3669001B2 JP3669001B2 (en) | 2005-07-06 |
Family
ID=13020621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05620595A Expired - Fee Related JP3669001B2 (en) | 1995-03-15 | 1995-03-15 | Swivel fitting for working equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3669001B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012162928A (en) * | 2011-02-08 | 2012-08-30 | Sanwa Kiko Kk | Swivel device of excavator |
-
1995
- 1995-03-15 JP JP05620595A patent/JP3669001B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012162928A (en) * | 2011-02-08 | 2012-08-30 | Sanwa Kiko Kk | Swivel device of excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3669001B2 (en) | 2005-07-06 |
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