JP3137428B2 - Underwater swivel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swivel table of a working machine having a swivel function, and more particularly to a submersible swivel table in which a sealing mechanism of a bearing portion thereof is improved so that the swivel table can be applied to an underwater work machine.

[0002]

2. Description of the Related Art As a conventional work machine having a turning function, there is a hydraulic excavator as shown in FIGS. In the hydraulic excavator, a swing bearing 51 is interposed between a swing frame 54 serving as a base of the upper swing body 52 and a base frame 56 on a lower traveling body 53. Then, dust, rainwater, and water scattered from a river intrude into the space between the inner ring and the outer ring in the slewing bearing 51, or the slewing bearing 51
A dust seal 58 is attached so as to cover the outside of a steel ball, which is a rolling element of the slewing bearing 51, in order to prevent leakage of lubricant such as internal grease to the outside. Further, in the above-mentioned hydraulic excavator, a simple sealing structure is formed by fitting a rubber seal 59 into a groove provided between the outer ring below the rotary joint 57 and the turning frame 52 at the rotary joint portion. .

[0003]

By the way, in the conventional swivel table as described above, a rubber dust seal having a low sealing ability is used for the shaft seal of the swivel bearing portion and the seal of the outer ring mounting portion of the rotary joint portion. Has been
When the swivel table is applied to an underwater working machine or the like, when a large load due to water pressure acts on the swivel bearing section and the rotary joint section, the seal does not follow the axial displacement and a gap is formed in the seal section. There is a problem that it occurs and sealability is significantly impaired.

[0004] Also, in the case of a construction using only a rubber dust seal, the sealing ability of the seal is low, so that even if the above-mentioned gap of the seal portion does not occur, it can be used for semi-submersible work on rivers and coasts. During heavy rainfall, water pressure acts on the seals of the slewing bearing and the rotary joint, and the possibility of flooding inside increases.

The present invention is intended to solve such a problem. In the slewing bearing portion, an outer ring fixed to an upper slewing frame so as to cover the slewing bearing, and an outer ring of the outer ring are provided. A plurality of seals are provided to allow relative sliding of the two rings while sealing the space between the inner ring and the inner ring fixed to the lower base frame so as to oppose the inner peripheral portion, and a seal is provided at the rotary joint. By using a seal member that can follow the axial displacement while providing a gap in the part to allow the axial displacement, the sealing performance of the slewing bearing part and the rotary joint part has been improved so that it can be applied to underwater working machines. It is intended to provide an underwater swivel.

[0006]

In order to achieve the above object, an underwater swivel according to the present invention comprises a base frame installed on the bottom of a water, a swivel frame rotatably provided on the base frame, and a swivel frame. A slewing bearing interposed between the frame and the slewing frame; an outer ring fixed to the slewing frame so as to cover the slewing bearing; and the base so as to face an inner peripheral portion of the outer ring. provided with an inner ring which is fixed to the frame, these external ring and allowed to luciferyl Lumpur relative sliding of the rings while sealed watertight between the inner ring is provided,
The seal is provided in a seal holding groove formed in one of the outer ring and the inner ring, and a rigid holding member for restricting bending of the seal and adding pressure resistance to external water pressure is provided. The seal is interposed between the upper wall of the seal holding groove and the seal.

Further, the underwater swivel base according to the present invention is provided with a rotary joint between the base frame and the swivel frame along the swivel center line of the swivel frame so as to relatively rotate the two frames. , The shaft portion of the rotary joint is fixed to the base frame,
A housing portion of the rotary joint is inserted into the circular hole of the revolving frame with a gap therebetween, and a bent bar-shaped connecting member for gently restraining the housing portion on the revolving frame is provided. A seal for preventing intrusion is provided.

[0008]

In the underwater swivel according to the present invention, the outer ring fixed to the swivel frame so as to cover the swivel bearing, and the inner ring fixed to the base frame so as to face the inner peripheral portion of the outer ring. Is provided, and a plurality of seals are attached between the outer ring and the inner ring, so that the two rings are allowed to slide relative to each other while the two rings are sealed in a watertight manner.

Further, one of the plurality of seals has a rigid holding member interposed between the upper wall of the holding groove for holding the seal and the seal. On the other hand, an action of keeping the sealing performance and preventing water from entering the inside of the seal is performed. Furthermore, while being loosely restrained with respect to the housing portion of the rotary joint and the revolving frame, the gap between the housing portion and the circular hole of the revolving frame is sealed while following the axial displacement of the rotary joint to prevent water intrusion. Is performed.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall schematic view of an underwater swivel as an embodiment of the present invention, FIG. 2 is a sectional view of the swivel bearing, and FIG. 4 is an enlarged view of a main part A of FIG. 1, and FIG. 5 is a view taken in the direction of arrow B in FIG. 4.

As shown in FIG. 1, in the underwater swivel of this embodiment, there are two places having a sealing function, one of which is a traveling frame 11 as a lower base frame installed on a water bottom 23, A bearing seal portion 1 of a slewing bearing 6 provided between a slewing frame 10 and a slewing frame 10 having a slewing speed reducer 8 rotatably provided on a frame 11, and the other along a slewing center line of the slewing frame 10. The rotary joint seal portion 7 seals between the rotary joint 9 and the revolving frame 10 provided.

First, the bearing seal portion 1 of the swivel bearing 6 in the underwater swivel according to the present embodiment will be described. As shown in FIG. 2, the turning bearing 6 interposed between the traveling frame 11 and the turning frame 10 pivots between the inner ring 6b fastened to the traveling frame 11 via the spacer 6e with the bolt 6d and the bolt 6c. An outer ring 6a fastened to the frame 10 is provided.
A seal 4g is provided between the bolt 6d and the traveling frame 11.
Is provided.

An external ring is provided on the turning frame 10 so as to cover the outside of the outer ring 6a.
The outer ring includes a first seal mounting ring 2 mounted on the turning frame 10 by bolts 2a, and a second seal mounting ring 3 mounted on the seal mounting ring 2 by bolts 3a. The first seal mounting ring 2 has a groove in which a seal 4d is incorporated on a contact surface with the revolving frame 10, a seal holding groove 4i for incorporating the seal 4a on an inner wall surface, and a bottom surface. By mounting the second seal mounting ring 3, a seal holding groove 4j for incorporating the seal holder 4h and the seal 4b is formed.
In addition, the second seal mounting ring 3 has a groove on which the seal 4e is incorporated on a contact surface with the first seal mounting ring 2, and a seal holding groove 4k for incorporating the seal 4c is formed on the inner wall surface. Have been.

On the other hand, the running frame 11 has a seal slide as an inner ring facing the inner peripheral portion of the outer ring formed by the first seal mounting ring 2 and the second seal mounting ring 3. The moving ring 5 is fixed by bolts 5a. Here, a suitable clearance for sealing is provided between the inner peripheral portion of the outer ring and the seal sliding ring 5.
15 are reserved. The seal slide ring 5 has a seal 4f incorporated in a contact surface with the traveling frame 11.

Thus, a three-stage seal is formed between the inner peripheral portion of the outer ring and the seal sliding ring 5. That is, the lower part of the seal 4c has a large allowable sliding width and performs the function of a dust seal.
And a seal 4b having high pressure resistance and high sealing performance is incorporated in the next middle stage. Further, a seal 4a that has a backup function of the middle seal and a function of enclosing the lubricant of the seal portion is incorporated in the upper stage.

The seal holding groove 4j of the middle seal 4b is provided with a seal holder 4h, which is a rigid holding member for limiting the bending of the seal 4b and applying a water resistance against the external water pressure. It is interposed between the upper wall of 4j and the seal 4b. The seals 4d, 4e, and 4 are fixed seals provided on each contact surface for the purpose of sealing them.
O-rings are used for f and 4g. With the configuration as described above, the following operation and effects can be obtained in the bearing seal portion 1 of the swivel bearing 6 of the underwater swivel base of the present embodiment.

That is, as shown in FIG. 1, when a machine having the main turning table is installed on the water bottom 23 and the water surface 22 is located on the far upper surface, the water pressure of the above-mentioned machine in the water depends on its water depth (Hw). In this case, the above-mentioned water pressure acts on the gap 15 between the first and second seal mounting rings 2 and 3 and the seal sliding ring 5, and mud, sand, foreign matter and the like in the water adhere. become. At this time, the pressure inside the bearing seal portion 1 and the space 16 is atmospheric pressure, and a pressure difference is generated between the inside of the bearing seal portion 1 and the water outside the seal portion 1, but the seals 4a, 4b, 4
An appropriate tightening force acts on c, and the following water pressure resistance treatment is performed, so that the inside of the bearing seal portion 1 is prevented from being flooded.

That is, the lowermost seal 4c has a small sealing tension but a large sliding width, and is made of a material containing an anti-seizure material as a seal sliding surface material. Although it does not have pressure, it has a dust seal function to prevent intrusion of mud, sand, foreign matter and the like. Next, the middle seal 4b is provided with a metallic seal retainer 4h on the rear surface behind the lip to enhance the pressure resistance.
The high-pressure water that has passed through can be completely sealed.

Further, an upper seal 4a is installed, and the upper seal 4a functions as a spare water-resistant seal as a measure for sealing when the middle seal 4b is damaged.
In between, a seal 4a is incorporated to enclose a lubricant such as grease and to lubricate the sliding surface of each seal. As described above, since a plurality of seals are stacked in multiple stages and each of them has a different function, it is possible to prevent high-pressure water and foreign substances in the water from entering the inside of the bearing seal portion 1.

Next, the rotary joint seal 7 in the underwater swivel according to the present embodiment will be described. The rotary joint 9 is connected between the running frame 11 and the turning frame 10 along the turning center line of the turning frame 10 so that the frames 10 and 11 can rotate relative to each other. As shown in FIG. The shaft 9b of the joint 9 is fixed to the traveling frame 11 by bolts 11a. As shown in FIGS. 3 to 5, the housing portion 9 a of the rotary joint 9 is inserted into the circular hole of the turning frame 10 with a gap. That is, an outer ring 9d is formed in the housing portion 9a, and a seal joining surface 14 as an inner ring is fixed to the outer ring 9d by a bolt 9c so that a sealing surface is formed on the outside. And seal joint surface 1
A seal mounting ring 12 as an external ring is fixed to the revolving frame 10 with a bolt 12a so as to face the outer peripheral portion of the rotary frame 4 while having a gap δ between the seal mounting surface 14 and the outer ring.

The housing portion 9a is connected to the turning frame 10
Is mounted so as to be loosely restrained by a support 19 which is a bent rod-shaped connecting member. That is, the housing portion 9a is provided with a bolt 20 attached to the support 19 for connection with the support 19, and a gap 21 between the distal end portion of the support 19. That is, they are mounted with play in the circumferential direction.

Further, two seal holding grooves for forming a two-stage seal are formed on the inner peripheral wall of the seal mounting ring 12.
12c and 12d are provided, and it is possible to incorporate the seals 13a and 13b with the seal joint surface 14. Usually, O-rings are used for the seals 13a and 13b. As in the case of the above-described slewing bearing seal portion 1, a seal 13d is provided on a contact surface between the slewing frame 10 and the seal mounting ring 12, a seal 13c is provided on a contact surface between the outer ring 9d and the seal joint surface 14, and traveling. Seals 13e are also provided on the contact surfaces between the frame 11 and the shaft 9b, and these seals are fixed seals such as O-rings.

With the above configuration, the following functions and effects can be obtained in the rotary joint seal portion 7 of the underwater swivel according to the present embodiment. First, even in the rotary joint seal section 7 in the submerged state, the aforementioned bearing seal section 1
Similarly, the internal space 18 is at atmospheric pressure, and a pressure difference occurs outside of the space, that is, underwater. In addition, the rotary joint 9 mounting side frame 10 and the traveling frame 11
Is a slewing bearing 6 having play in the radial and thrust directions.
, The rotary joint seal portion 7 has a housing portion 9 attached to each.
a rotates while swinging with respect to the shaft 9b. However, in the present embodiment, the housing portion 9a and the revolving frame 10 have a proper clearance (δ) 17 with respect to the housing portion 9a, and a seal mounting ring concentrically incorporating seals 13a and 13b on the inner peripheral surface. Since 12 is mounted, the swing of the turning frame 10 with respect to the traveling frame 11 is absorbed by the gap (δ) 17,
The high-pressure water is sealed by a plurality of multistage seals 13a and 13b.

Further, transmission of force between the rotary joint 9 and the turning frame 10 will be described in detail with reference to FIGS. The rotary joint 9 is a fluid rotary joint, and a shaft 9b is inserted into an inner surface of a cylindrical housing portion 9a. When the shaft 9b is directly attached to the traveling frame 11 and the housing portion 9a is directly attached to the turning frame 10, when the turning frame 10 turns while swinging up and down with respect to the traveling frame 11, there is a burning between the shaft 9b and the housing portion 9a. Oil leakage due to sticking or poor sealing occurs. Therefore, in order not to affect the swing of the turning frame 10, as shown in FIG.
An appropriate gap 21 is provided between the support (bending bar-shaped connecting member) 19 and the housing part 9a for mounting on the bolt 10 and the bolt 20
It transmits the rotational force. Thus, underwater,
When the swivel is submerged in water, the swivel bearing portion 1 and the rotary joint seal portion 7 are prevented from being immersed in water from the outside and hermetically sealed.

[0025]

As described above, according to the underwater swivel of the present invention, the following effects can be obtained. (1) and an external ring secured to the swivel frame so as to cover the pivot bearing, with an inner ring is provided which is secured to the base <br/> over scan frames so as to face the inner peripheral portion of Dogaibu ring,
These outer ring and Cie Lumpur to allow relative sliding of the rings while sealed watertight between the inner ring is provided, even without flooding the interior of the pivot bearing underwater work, corrosion , No damage problem. The seal is provided in a seal holding groove formed in one of the outer ring and the inner ring, and has a rigidity for limiting bending of the seal and adding pressure resistance to external water pressure. Since the holding member is interposed between the upper wall of the seal holding groove and the seal, the sealed state can be maintained even with high water pressure. ( 2 ) The shaft of the rotary joint is fixed to the base frame, and the housing of the rotary joint is inserted into the circular hole of the turning frame with a gap,
Since a bent rod-shaped connecting member (support) for gently restraining the housing portion to the turning frame is provided,
A sealed state can be maintained by following the axial displacement of the rotary joint. ( 3 ) Since the outer periphery of the slewing bearing is enclosed and sealed with an outer ring and an inner ring, conventional slewing bearings for land machines can be used without changing the specifications for waterproofing, and cost reduction can be achieved. it can.

[Brief description of the drawings]

FIG. 1 is an overall schematic diagram showing a submersible swivel as one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the slewing bearing of FIG.

FIG. 3 is a cross-sectional view of the rotary joint of FIG.

FIG. 4 is an enlarged view of a main part A of FIG.

FIG. 5 is a view taken in the direction of arrow B in FIG. 4;

FIG. 6 is an overall view of a conventional underwater swivel.

FIG. 7 is a sectional view of a main part of FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bearing seal part 2 1st seal mounting ring (outer ring) 2a bolt 3 2nd seal mounting ring (outer ring) 3a bolt 4a-4g seal 4h Seal holder 4i-4k Seal holding groove 5 Seal sliding ring 6 Slewing bearing 6a Outer ring 6b Inner ring 6c, 6d Bolt 6e Spacer 7 Rotary joint seal part 8 Rotation reducer 9 Rotary joint 9a Housing part 9b Shaft 9c Bolt 9d Outer ring 10 Swivel frame 11 Running frame 12 Seal mounting ring 12a Bolts 12c, 12d Seal holding Groove 13a ~ 13e Seal 14 Seal joint surface 15 , 17 Clearance 16,18 Space 19 Support 20 Bolt 21 Clearance δ Clearance

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoru Takeda 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (56) References Jikken 52-1521 (JP, Y2) (58) Field surveyed (Int.Cl. ⁷ , DB name) E02F 9/12 E02F 5/00 F16C 33/76 F16J 15/16

Claims (2)

(57) [Claims] 1. A base frame installed on a water bottom,
An externally mounted swivel frame provided on the base frame, and a swivel bearing interposed between the base frame and the swivel frame; A ring and an inner ring fixed to the base frame so as to face an inner peripheral portion of the outer ring. Cie Lumpur is provided to permit the sliding, the seal on
Formed on either outer ring or inner ring
Provided in the seal holding groove
In order to add pressure resistance to external water pressure by limiting the bending of
The rigid holding member has an upper wall of the seal holding groove and the seal holding groove.
A submersible swivel , interposed between 2. A rotary joint is provided between the base frame and the revolving frame along a revolving center line of the revolving frame so as to relatively rotate the two frames, and a shaft portion of the rotary joint is provided. A bent bar-shaped connecting member fixed to the base frame, and a housing portion of the rotary joint is inserted into the circular hole of the revolving frame with a gap therebetween, and the housing portion is loosely restrained by the revolving frame. 2. The underwater swivel according to claim 1, wherein a seal is provided to prevent outside water from entering the gap.