JPH06180019A - Underwater turning stand - Google Patents

Abstract

PURPOSE:To secure the close seal of a bearing portion and apply it to an underwater work machine by providing seals in plural rows between the outside ring fixed at a turning frame and the inside ring fixed at a base frame. CONSTITUTION:In the case of the bearing seal portion 1 of the turning bearing 6 of an underwater turning stand, the following operation/effect is obtained. In a case in which a machine having this turning stand is provided at the water bottom 23 and the water surface 22 is far above, water pressure that is due to its water depth (HW) acts upon the above machine that is in the watr, so this water pressure aacts upon an opening 15 between first and second seal fitting rings 2, 3 and a seal slide ring 5, and at the same time mud, sand, foreign objects or the like are affixed. At this time, the pressure of the bearing seal portion 1 inside and a space portion 16 is made to be atmospheric pressure, and there occurs pressure difference in regard to the water pressure of the outside of the bearing seal portion 1, but the heights of seals 4a, 4b are set larger than seal retaining grooves 4i, 4j so that tightening margins may be given to the seals 4a, 4b initially, so appropriate tension force acts on, and at the same time as an anti-water pressure measure like the following is administered, inundation into the inside of the bearing seal portion 1 is prevented.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a conventional working machine having a turning function, there is a hydraulic excavator as shown in FIGS. In the hydraulic excavator, a slewing bearing 51 is interposed between a slewing frame 54 serving as a base of the upper slewing body 52 and a base frame 56 on a lower traveling body 53. Then, dust, rainwater, and splashed water from the river enter the space between the inner ring and the outer ring of the slewing bearing 51, or the slewing bearing 51
In order to prevent lubricant such as grease inside from leaking to the outside, a dust seal 58 is attached so as to cover the outer side of the steel ball that is the rolling element of the slewing bearing 51. Further, in the above hydraulic excavator, also in the rotary joint portion, a rubber seal 59 is fitted in a groove provided between the outer ring under the rotary joint 57 and the revolving frame 52 to form a simple sealing structure. .

[0003]

By the way, in the conventional swivel base as described above, a rubber dust seal having a low sealing ability is adopted as the shaft seal of the swivel bearing portion and the seal of the outer ring mounting portion of the rotary joint portion. Because it has been
When the swivel base is applied to an underwater work machine, etc., when a large load due to hydraulic pressure acts on the swivel bearing part and the rotary joint part, the seal does not follow the axial displacement and there is a gap in the seal part. However, there is a problem in that the sealing property is significantly impaired.

Originally, since the rubber seal alone has a low sealing ability, the seal has a low sealing ability. During a heavy rain, water pressure acts on the seals of the slewing bearing and the rotary joint, and there is a high possibility that water will enter the interior. Further, when foreign matter such as earth and sand adheres to the sliding surface of the seal, the seal may be worn or damaged, and the sealability may be deteriorated quickly.

The present invention is intended to solve such a problem, and 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. There are multiple rows of seals that allow relative sliding of both rings while water-tightly sealing the inner ring fixed to the lower base frame so as to oppose the inner circumference, and also swivel in the rotary joint section. Like the bearing part, a gap is provided in the seal part, and a seal member that allows axial displacement while following the axial displacement is used to improve the sealing performance of the swivel bearing part and the rotary joint part, and underwater working machine. It is intended to provide an underwater swivel adapted to be applied to.

[0006]

In order to achieve the above object, an underwater swivel base of the present invention includes a base frame installed on the bottom of the water, a swivel frame rotatably provided on the base frame, and these bases. An outer ring having a slewing bearing interposed between the frame and the slewing frame, fixed to the slewing frame so as to cover the slewing bearing, and the base so as to face the 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 the outer ring and the inner ring in a watertight manner. It is provided in the seal holding groove formed on either the outer ring or the inner ring of the seal and the back of the seal is pressed to increase the watertightness by pressing the back surface of the seal. 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, in the underwater swivel base of the present invention, a rotary joint is provided between the base frame and the swivel frame along the swivel center line of the swivel frame so as to relatively rotatably connect the both frames. , The shaft portion of the rotary joint is fixed to the base frame,
Moreover, the housing part of the rotary joint is fitted into the circular hole of the swivel frame with a clearance, and a bent rod-like connecting member for gently restraining the housing part to the swivel frame is provided, and external water in the gap is provided. It is characterized by the provision of a seal to prevent entry.

[0008]

In the above-mentioned underwater swivel base of 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 are sealed in a watertight manner while allowing relative sliding of the two rings. Further, on the back side of one of the plurality of rows of seals, a fluid pressure introducing passage communicating with a holding groove for holding the seal and a high-pressure fluid supply pump connected to the fluid pressure introducing passage are provided. Therefore, the seal is constantly pressed against the seal sliding ring with a constant pressing force, the sealing property is maintained against high-pressure water, and it is possible to prevent water from entering the seal. Furthermore, it is loosely restrained with respect to the housing part of the rotary joint and the swivel frame, and seals the gap between the housing part and the circular hole of the swivel frame while following the axial displacement of the rotary joint to prevent water from entering. The action is performed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An underwater swivel base as one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic view thereof, FIG. 2 is a sectional view of its swivel bearing portion, and FIG. 3 is its rotary joint portion. FIG. 4 is an enlarged view of a main part A of FIG. 1, FIG. 5 is a view taken in the direction of arrow B of FIG. 4, and FIG. 6 is an explanatory view of the seal of FIG.

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 the water bottom 23 and the same traveling. A bearing seal portion 1 of a slewing bearing 6 provided between a slewing frame 10 having a slewing speed reducer 8 rotatably provided on a frame 11, and the other one is along a slewing center line of the slewing frame 10. It is a rotary joint seal portion 7 that seals between the rotary joint 9 and the revolving frame 10 that are provided.

First, the bearing seal portion 1 of the swivel bearing 6 in the underwater swivel of this embodiment will be described. As shown in FIG. 2, the slewing bearing 6 interposed between the traveling frame 11 and the slewing frame 10 includes an inner ring 6b fastened to the traveling frame 11 via a spacer 6e by a bolt 6d and a slewing bearing by a bolt 6c. It has an outer ring 6a fastened to the frame 10. A seal 4g is provided between the bolt 6d and the traveling frame 11. The outer frame 6 is attached to the turning frame 10.
An outer ring is provided so as to cover the outside of the a, and the outer ring is rotated by the bolt 2a.
And a second seal mounting ring 3 mounted on the seal mounting ring 2 with bolts 3a.

The first seal mounting ring 2 has a groove in which a seal 4h is incorporated on the contact surface with the revolving frame 10. Further, a second seal mounting ring 3 is mounted on the bottom surface with a bolt 3a.
Has a seal 4 on the contact surface with the first seal mounting ring 2.
A seal groove for incorporating e is formed. The second
The seal mounting ring 3 has an inner wall surface (upper surface) formed with a seal holding groove 4i for incorporating the seal 4a, and both sides of the holding groove 4i are provided with grooves for incorporating the seals 4c and 4d, respectively. Has been formed. Further, a fluid pressure introduction path for introducing a fluid pressure for pressing the seal back surface is connected to the seal back surface side of the seal holding groove 4i.

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

An appropriate gap 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 secured. The seal sliding ring 5 has a seal 4f incorporated in the 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 front row, and a seal 4a having large pressure resistance and sealing performance is incorporated in the rear row, the outer diameter section. . At this time, the 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 so as to be sealed therein.

By the way, the seal 4a has a second dimension
Is slightly smaller than the width of the seal holding groove 4i of the seal mounting ring 3, and when fluid pressure acts on the seal back space 4k, the seal 4a freely moves forward and is pressed against the seal sliding ring 5. I will. The fixed seals 4e, 4 provided between the contact surfaces to seal them
O-rings are used as f and 4h.

With the above-mentioned structure, the bearing seal portion 1 of the slewing bearing 6 of the submersible swivel base according to this embodiment has the following actions and effects. That is, as shown in FIG. 1, a machine having a main swivel base is installed on the water bottom 23, and the water surface 22
In such a case, water pressure acts on the machine in water depending on the water depth (Hw). In this case, the clearance between the first and second seal mounting rings 2 and 3 and the seal sliding ring 5 is generated. The above water pressure acts on 15 as well as mud in the water,
Sand and foreign matter will adhere. At this time, the pressure inside the bearing seal portion 1 and the space portion 16 is atmospheric pressure, which causes a pressure difference with respect to the water pressure outside the bearing seal portion 1.
The height of the seals 4a and 4b is set to be larger than that of the seal holding grooves 4i and 4j so that the seals 4a and 4b can be tightly tightened in the initial stage. Since the water pressure treatment is performed, it is possible to prevent water from entering the inside of the bearing seal portion 1.

That is, the seal 4b on the inner diameter side which is the front row
Has a small seal tightening force but a large sliding width, and since a material containing an anti-seizure material is used as the seal sliding surface material, it does not have water pressure resistance, but mud, sand, foreign matter It has a dust seal function to prevent the entry of such things as. Next, in the rear row, the seal 4a on the outer diameter side is provided with a space portion 4k on the back surface thereof, and the pump 4p, the pipe line 4m,
Since the fluid pressure is introduced through the fluid inlet portion 4n, the seal 4a is pressed against the seal sliding ring 5. At this time,
As shown in FIG. 6 (a), the pressing fluid pressure P is set so that the pressing force F _P becomes larger than the seal retreating force F _w 'generated by water pressure, and the high pressure water is completely sealed by the seal 4a. To do. Further, even if the seal 4a is worn due to mud, sand, foreign matter, etc., if the fluid pressure P is kept constant, as shown in FIG.
As shown in (b), the seal 4a moves upward by d until the initially set pressing force is reached, and the pressing force F _P is secured.
Therefore, the high-pressure water sealability is continuously maintained. 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 when the seal 4a moves upward. Therefore, since there is a gap, the seals 4c and 4d are arranged on both sides of the seal 4a to seal the 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 has a different function, it is possible to prevent high pressure water and foreign matter in water from entering the inside of the bearing seal portion 1. It can be prevented.

Next, the rotary joint seal portion 7 of the underwater swivel base of this embodiment will be described. The rotary joint 9 is coupled between the traveling frame 11 and the revolving frame 10 along the revolving center line of the revolving 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 with bolts 11a. As shown in FIGS. 3 to 5, the housing portion 9a of the rotary joint 9 is fitted in the circular hole of the revolving frame 10 with a gap. That is, an outer ring 9d is formed on the housing portion 9a, and a seal joint surface 14 as an inner ring is fixed by a bolt 9c so that a seal surface is formed on the outer ring 9d.

Then, the seal mounting ring 12 as an outer ring is provided so as to face the outer peripheral portion of the seal joint surface 14.
However, it is fixed to the swivel frame 10 by the bolts 12a while having a gap δ between the seal joint surface 14 and the seal joint surface 14. 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, the bolt 20 attached to the housing portion 9a for connecting to the support 19,
A gap 21 is provided between the support 19 and the tip portion thereof, so that the housing portion 9a is mounted with play in the vertical and circumferential directions of the rotary joint 9.

Further, the inner peripheral wall of the seal mounting ring 12 has two seal holding grooves for forming a two-stage seal.
12c and 12d are provided, and the seals 13a and 13b can be incorporated between the seal joint surface 14 and the seals. Normally, O-rings are used for the seals 13a and 13b. As with the swivel bearing seal portion 1 described above, the seal 13d is provided on the contact surface between the swivel frame 10 and the seal mounting ring 12, the seal 13c is provided on the contact surface between the outer ring 9d and the seal joint surface 14, and the 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-mentioned structure, the rotary joint seal portion 7 of the submersible swivel of this embodiment can obtain the following actions and effects. First, when the rotary joint seal portion 7 is also submerged in water, the bearing seal portion 1
Similarly, the internal space 18 is at atmospheric pressure, and a pressure difference is generated outside the space 18, 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.
Since the rotary joint seal portion 7 is attached through the housing portion 9 attached to each of them,
The a rotates about the shaft 9b while swinging. However, in this embodiment, the housing portion 9a and the revolving frame 10 have a proper gap δ between them and the housing portion 9a,
Since the seal mounting ring 12 in which the seals 13a and 13b are assembled on the inner peripheral surface is concentrically mounted, 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. It will be performed in 13a and 13b.

Further, the transmission of force between the rotary joint 9 and the revolving frame 10 will be described in detail with reference to FIGS. The rotary joint 9 is a fluid rotary joint, and the shaft 9b is inserted into the 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 swivel frame 10, when the swivel frame 10 swings vertically with respect to the traveling frame 11, the shaft 9b and the housing portion 9a are burned. Oil leaks due to sticking or poor sealing. Therefore, as it does not affect the swing of the swing frame 10, as shown in the figure, the swing frame
A proper 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 way, the water is prevented from entering the swivel bearing portion 1 and the rotary joint seal portion 7 of the swivel base from the outside when it is submerged in water, and sealing is achieved. In the present embodiment, the machine having the swivel base is described as being grounded. However, in a submersible working machine in which the traveling frame under the swivel has a traveling device such as a caterpillar and freely travels on the water bottom. Is also a structure in which the same configuration and action are established.

[0025]

As described above in detail, according to the underwater swivel base 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 the inner peripheral portion of the outer ring are provided. Since the ring and the inner ring are watertightly sealed and a multi-stage seal that allows relative sliding of both rings is provided, the internal slewing bearing will not be submerged even during underwater work and will not be corroded or damaged. There is no problem. (2) One of the multiple-stage seals is provided in the seal holding groove formed on either the outer ring or the inner ring, and the back surface of the seal is pressed to ensure watertightness. In order to enhance the seal, 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 equipped, so that the sealing force is always constant. Can be pressed against the sliding surface, and even if the sliding portion of the seal is worn, a uniform seal tightening force is always maintained, and the water resistant sealability is maintained. (3) The shaft part of the rotary joint is fixed to the base frame, and the housing part of the rotary joint is fitted into the circular hole of the revolving frame with a gap, and
Since the bent rod-shaped connecting member that gently restrains the housing portion to the swivel frame is provided, the sealed state can be maintained by following the axial displacement of the rotary joint. (4) Since the circumference of the slewing bearing is enclosed by the outer ring and the inner ring to be hermetically sealed, the slewing bearing can be used for conventional land machines without changing the specifications for waterproofing, and cost can be reduced. .

[Brief description of drawings]

FIG. 1 is an overall schematic view showing an underwater swivel base as one embodiment of the present invention.

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

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

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

5 is a view on arrow B of FIG. 4. FIG.

6 (a) and 6 (b) are explanatory views of the action of the seal in FIG.

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

8 is a cross-sectional view of the main part of FIG.

[Explanation 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 part 4m pipe line 4n fluid inlet part 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 Slewing reducer 9 Rotary joint 9a Housing part 9b Shaft 9c Bolt 9d Outer ring 10 Swing frame 11 Travel frame 12 Seal mounting ring 12a Bolt 12c, 12d Seal holding groove 13a to 13e Seal 14 Seal joint surface 15 Clearance 16, 18 Space 19 Support 20 Bolt 21 Clearance 22 Lubricant δ Clearance

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location F16J 15/40 Z 8207-3J (72) Inventor Satoru Takeda 1-chome Wadazakicho, Hyogo-ku, Kobe No. 1 Sanritsu Heavy Industries, Ltd. Kobe Shipyard

Claims (2)

[Claims] 1. A base frame installed on the bottom of the water,
An outer frame having a revolving frame rotatably provided on the base frame and a revolving bearing interposed between the base frame and the revolving frame, and fixed to the revolving frame so as to cover the revolving frame. A ring and an inner ring fixed to the base frame so as to face the inner peripheral portion of the outer ring are provided, and the outer ring and the inner ring are sealed in a watertight manner and the relative distance between the two rings. A plurality of rows of seals that allow sliding are provided, and the seals are provided in the seal holding groove formed in either one of the outer ring and the inner ring, and
A fluid pressure introducing 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 introducing passage in order to press the back surface of the seal to increase watertightness. Underwater swivel, characterized by 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 rotatably connect the both frames, and a shaft portion of the rotary joint is provided. The housing part of the rotary joint is fixed to the base frame, and the housing part of the rotary joint is fitted into the circular hole of the swivel frame with a gap therebetween. The underwater swivel base according to claim 1, further comprising a seal for preventing intrusion of external water into the gap.