JP2871367B2 - 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. And the slewing bearing 51
In order to prevent external dust, rainwater and splashing water from flowing into the space between the inner ring and the outer ring, and to prevent lubricant such as grease inside the slewing bearing 51 from leaking to the outside. A dust seal 58 is attached so as to cover the outside of a steel ball as a rolling element of the slewing bearing 51. Further, in the above-mentioned hydraulic excavator, a rubber seal 59 is fitted in a groove provided between the outer race below the rotary joint 57 and the turning frame 54 at the rotary joint portion, and a simple sealing structure is formed. .

[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. Further, if foreign matter such as earth and sand adheres to the sliding surface of the seal, there is a problem that the seal is worn and damaged, and the sealing performance is rapidly reduced.

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. In addition to providing multiple rows of seals that allow the two rings to slide relative to each other while sealing the gap between the inner ring and the inner ring fixed to the lower base frame so as to oppose the inner periphery, the rotary joint also turns. A submersible working machine that uses a seal member that can follow the axial displacement while permitting axial displacement by providing a clearance in the seal portion like the bearing portion, and improves the sealing performance of the slewing bearing portion and the rotary joint portion. It is an object of the present invention to provide a submersible swivel that can be applied to a watercraft.

[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. An inner ring fixed to the frame is provided, and a plurality of rows of seals are provided to allow relative sliding between the outer ring and the inner ring while sealing between the outer ring and the inner ring in a watertight manner. The seal is provided in a seal holding groove formed in one of the outer ring and the inner ring, and is pressed against the back surface of the seal to improve watertightness. It is characterized in that a fluid pressure introducing path communicating to the seal holding groove, and the high-pressure fluid supply pump connected to the fluid pressure introduction path is equipped at the side.

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 rows of seals are attached between the outer ring and the inner ring, so that the two rings can slide relative to each other while allowing the two rings to slide relative to each other. In addition, on the back side of one of the seals in the plurality of rows, a fluid pressure introduction path communicating with the holding groove holding the seal, and a high pressure fluid supply pump connected to the fluid pressure introduction path are provided. Therefore, the seal is constantly pressed against the seal sliding ring with a constant pressing force, and the sealing performance is maintained even with high-pressure water, so that the inside of the seal can be prevented from being flooded. 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.

[0009]

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, FIG. 5 is a view as viewed from an arrow B of FIG. 4, and FIG. 6 is an explanatory view of the seal of FIG. 2.

As shown in FIG. 1, in the underwater swivel of this embodiment, there are two locations 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 swivel bearing 6 interposed between the traveling frame 11 and the pivoting frame 10 pivots with 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. Note that a seal 4g is provided between the bolt 6d and the traveling frame 11. The turning frame 10 includes the outer ring 6.
An external ring is provided so as to cover the outside of the turning frame 10a by a bolt 2a.
And a second seal attachment ring 3 attached to the seal attachment ring 2 by bolts 3a.

The first seal mounting ring 2 has a groove in which a seal 4h is incorporated on a contact surface with the revolving frame 10. Further, a second seal mounting ring 3 is mounted on the bottom surface with bolts 3a.
Is a seal 4 on the contact surface with the first seal mounting ring 2.
A seal groove for incorporating e is formed. Also the second
The seal mounting ring 3 has a seal holding groove 4i for incorporating a seal 4a on an inner wall surface (upper surface) thereof, and grooves on which seals 4c and 4d are incorporated are formed on both side surfaces of the holding groove 4i. Is formed. In addition, a fluid pressure introduction path for introducing fluid pressure for pressing the seal back surface is communicated with the seal back surface of the seal holding groove 4i.

In the fluid pressure introducing passage, a seal back space 4k is formed as a pressure chamber for applying a fluid pressure introduced from the outside to the back of the seal 4a. A fluid inlet 4n and a pipe 4m for sending fluid pressure discharged from an external fluid pressure supply pump 4p to the same space 4k are connected to the seal back space 4k, and are formed in this manner. The fluid pressure from the pump 4p communicates with the space 4k via the fluid pressure introducing passage. Further, in the second seal mounting ring 3, a seal holding groove 4j for incorporating the seal 4b is formed on the inner wall surface (upper surface) of the inner surface of the seal 4a at the inner diameter side. On the other hand, a seal sliding ring 5 as an inner ring is provided on the traveling frame 11 so as to face an inner peripheral portion of an outer ring constituted by the first seal mounting ring 2 and the second seal mounting ring 3. It is fixed by bolts 5a.

An appropriate clearance is provided between the upper surface of the inner peripheral portion of the outer ring and the lower surface of the seal sliding ring 5 to prevent interference between the outer ring and the inner ring when the slewing bearing 6 slides. 15 are reserved. The seal slide ring 5 is provided with a seal 4f on a contact surface with the traveling frame 11. In this way, two rows of seals are formed between the upper surface of the inner peripheral portion of the outer ring and the lower surface of the seal sliding ring 5. That is,
First, a seal 4b having a large allowable sliding width and performing a dust seal function is incorporated in the inner diameter portion in the front row, and a seal 4a having high pressure resistance and high sealing performance is incorporated in the outer diameter portion in the rear row. . At this time, a lubricant 22 for the seal 4a is incorporated into the upper surface of the seal 4a below the space 16 formed on the inner diameter side of the first seal mounting ring.

By the way, the size of the seal 4a is
Is slightly smaller than the width of the seal holding groove 4i of the seal mounting ring 3, and when the fluid pressure acts on the seal back space 4k, the seal 4a freely advances and is pressed against the seal sliding ring 5. It shall be. The fixed seals 4e, 4e provided between the contact surfaces for sealing.
O-rings are used as f and 4h.

With the above-described configuration, the following operation and effects can be obtained in the bearing seal portion 1 of the swivel bearing 6 of the underwater swivel according to the present embodiment. In other words, as shown in FIG. 1, a machine having a main turntable is installed on the water bottom 23, and
In such a case, water pressure acts on the above-mentioned machine that is underwater due to its water depth (Hw). In this case, the gap between the first and second seal mounting rings 2 and 3 and the seal sliding ring 5 is provided. The above-mentioned water pressure acts on 15 and mud in the water,
Sand and foreign matter will adhere. At this time, the pressure inside the bearing seal portion 1 and the space 16 is at atmospheric pressure, and a pressure difference is generated with respect to the water pressure outside the bearing seal portion 1.
Since the height of the seals 4a, 4b is set larger than that of the seal holding grooves 4i, 4j so that the seals 4a, 4b can be initially provided with an interference, an appropriate tightening force acts, and the following resistance. Since the water pressure treatment is performed, the inside of the bearing seal portion 1 is prevented from being flooded.

That is, the seal 4b on the inner diameter side in the front row
The seal tension is small, but the sliding width is large, and a material containing anti-seizure material is used as the seal sliding surface material, so it has no water pressure resistance. It has a dust seal function to prevent intrusion of such as. Next, in the rear row, the outer diameter side seal 4a, a space portion 4k is disposed on the back surface thereof, and a pump 4p, a pipe line 4m,
Since the fluid pressure is introduced through the fluid inlet 4n, the seal 4a is pressed against the seal sliding ring 5. At this time,
As shown in FIG. 6 (a), the way the pressing force F _P is larger than the seal retracting force F _w 'generated by the water pressure, is pressed against the fluid pressure P is set, completely seal the high-pressure water in the seal 4a I do. In addition, even when the seal 4a is worn by mud, sand, foreign matter, etc., if the fluid pressure P is kept constant, FIG.
seal 4a until the pressing force which is initially set as indicated by (b) is shifted by d upward, the pressing force F _P is ensured.
Therefore, the high-pressure water sealing property is continuously maintained. When the seal 4a moves upward, the mounting width of the seal 4a is slightly smaller than the width of the seal holding groove 4i so that the seal 4a can move smoothly. Therefore, since there is a gap, the seals 4c and 4d are arranged on both side surfaces of the seal 4a to seal high-pressure water from the gap 15 (see FIG. 2).

As described above, since a plurality of seals are arranged in multiple rows and each of them has a different function, it is possible to prevent high-pressure water and foreign matter in the water from entering the inside of the bearing seal portion 1. Can be prevented.

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 traveling frame 11 and the turning frame 10 along the turning center line of the turning frame 10 so that the two 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.

The seal mounting ring 12 as an external ring is opposed to the outer peripheral portion of the seal joint surface 14.
Are fixed to the revolving frame 10 with the bolts 12a while having a gap δ with the seal joint surface 14. Further, the housing portion 9a is attached to the revolving frame 10 so as to be gently restrained by a support 19 which is a bent rod-shaped connecting member. That is, a bolt 20 attached to the housing portion 9a for connection with the support 19,
A gap 21 is provided between the support 19 and the tip of the support 19, so that the housing 9a is mounted with play in the vertical and circumferential directions of the rotary joint 9.

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 an appropriate gap δ with respect to the housing portion 9a therebetween.
Since the seal mounting ring 12 incorporating the seals 13a and 13b on the inner peripheral surface is mounted concentrically, the swing of the revolving frame 10 with respect to the traveling frame 11 is absorbed by the gap δ, and the high-pressure water is sealed by a plurality of multi-stage 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 19 attached to the housing 10 and the housing portion 9a, and the rotational force is transmitted by the bolt 20.

In this manner, water is prevented from being externally immersed in the swivel bearing portion 1 and the rotary joint seal portion 7 of the swivel table when submerged or submerged, and sealing is achieved. In the present embodiment, the machine having the revolving base is described as being grounded.However, in a submersible working machine in which the traveling frame at the lower part of the revolving platform has a traveling device such as a caterpillar and works while freely traveling on the water bottom. Is a structure in which a similar configuration and operation are achieved.

[0025]

As described above, according to the underwater swivel of the present invention, the following effects can be obtained. (1) An outer ring fixed to the revolving frame so as to cover the revolving bearing, and an inner ring fixed to the base frame so as to face an inner peripheral portion of the outer ring are provided. Multi-stage seals are provided to allow the relative sliding of both rings while sealing the ring and the inner ring in a watertight manner. No problem. (2) One seal of the plurality of seals is provided in a seal holding groove formed in one of the outer ring and the inner ring, and presses the back surface of the seal to improve watertightness. A fluid pressure introduction passage communicating with the seal holding groove on the back side of the seal and a high-pressure fluid supply pump connected to the fluid pressure introduction passage are provided so that the seal is always pressed with a constant pressing force. Can be pressed against the sliding surface, so that even if the seal sliding portion is worn, a uniform sealing tension is always maintained, and the water-resistant sealing property is maintained. (3) 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 revolving frame with a gap,
Since the bent bar-shaped connecting member for gently restraining the housing portion to the revolving frame is provided, the sealed state can be maintained by following the axial displacement of the rotary joint. (4) The outer periphery of the slewing bearing is enclosed and sealed with an outer ring and an inner ring, so conventional slewing bearings for land machinery can be used without changing the specifications for waterproofing, and costs can be reduced. .

[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;

6 (a) and 6 (b) are explanatory diagrams of the operation of the seal in FIG. 2.

FIG. 7 is an overall view of a conventional underwater swivel.

FIG. 8 is a sectional view of a main part of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing seal part 2 1st seal mounting ring 2a bolt 3 2nd seal mounting ring 3a bolt 4a-4h seal 4i, 4j Seal holding groove 4k Seal back space 4m Pipe line 4n Fluid inlet 4p Pump 5 Seal sliding Ring 6 Slewing bearing 6a Outer ring 6b Inner ring 6c, 6d Bolt 6e Spacer 7 Rotary joint seal part 8 Reducing reducer 9 Rotary joint 9a Housing part 9b Shaft 9c Bolt 9d Outer ring 10 Rotating frame 11 Running frame 12 Seal mounting ring 12a Bolts 12c, 12d Seal retaining groove 13a to 13e Seal 14 Seal joint surface 15 Clearance 16, 18 Space 19 Support 20 Bolt 21 Clearance 22 Lubricant δ Clearance

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16J 15/40 F16J 15/40 Z (72) Inventor Satoru Takeda 1-1-1 Wadazakicho, Hyogo-ku, Kobe-shi Mitsubishi Heavy Industries, Ltd. Company Kobe Shipyard (56) References JP-A-46-34504 (JP, A) JP-A-58-63263 (JP, U) JP-A-57-164174 (JP, U) (58) Fields investigated (Int) .Cl. ⁶ , DB name) E02F 9/12 B63C 11/34 E02F 5/00 F16C 33/76 F16J 15/18 F16J 15/40

Claims (2)

(57) [Claims] 1. A base frame installed on a water bottom,
An outer frame fixed to the turning frame so as to cover the turning bearing, comprising a turning frame rotatably provided on the base frame and a turning bearing interposed between the base frame and the turning frame; A ring, and an inner ring fixed to the base frame so as to face an inner peripheral portion of the outer ring. A plurality of rows of seals that allow sliding are provided, and the seals are provided in seal holding grooves formed in one of the outer ring and the inner ring,
A fluid pressure introduction passage communicating with the seal holding groove on the back side of the seal and a high-pressure fluid supply pump connected to the fluid pressure introduction passage are provided on the back side of the seal to press the rear surface of the seal to increase water tightness. An underwater swivel, characterized in that: 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 rod-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 gently 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.