JP2908236B2 - Swivel joint and high work equipment using the same - 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 joint for connecting a flow path in a relative rotating portion of a device using a fluid pressure or the like, and to a working device at a high place using the same.

[0002]

2. Description of the Related Art A swivel joint comprises an outer peripheral member formed in a cylindrical shape and an inner peripheral member inserted into the outer peripheral member so as to be relatively rotatable and slidable. Attached to. For example, in a hydraulic aerial work vehicle, a work table that horizontally turns around the post member is attached to a post member that extends vertically and is attached to the tip of the hoisting boom. A winch is attached to the upper end of the post member so as to be horizontally pivotable independently of the worktable. A hydraulic control valve for controlling the supply and discharge of hydraulic pressure to the winch and controlling the operation of the winch is attached to the work table. In this case, the swivel joint is built into the post member,
For example, the outer peripheral member is connected to and supported by the post member, and the inner peripheral member is connected to the worktable, and rotates integrally with the worktable with respect to the outer peripheral member. A hydraulic pipe (boom-side hydraulic pipe) connected to a hydraulic pump and an oil tank through the boom is connected to the outer peripheral member. On the other hand, a hydraulic pipe (valve-side hydraulic pipe) connected to the hydraulic valve is connected to the inner peripheral member, and an internal flow path for connecting a flow path between the pump-side pipe and the valve-side pipe is formed. In this manner, the work table can smoothly perform a 360 ° horizontal turn with respect to the boom without obstructing these pipes.

[0003]

However, conventionally, the hydraulic piping (the winch-side hydraulic piping) between the hydraulic control valve attached to the work table and the winch has been connected through the outside of the post member. For this reason, when the winch is pivoted horizontally with respect to the boom, the winch-side piping may become an obstacle, and there is a problem in that the operation is hindered.

[0004] The present invention has been made in view of such a problem, and uses a swivel joint and a swivel joint capable of smoothly performing not only a horizontal swing movement of a winch but also a boom. It is intended to provide an aerial work apparatus.

[0005]

In order to achieve the above-mentioned object, a swivel joint according to the present invention comprises a plurality of inner peripheral members arranged in the axial direction of rotational sliding and inserted into an outer peripheral member. Are configured to independently rotate and slide with respect to the outer peripheral member. Specifically, two inner peripheral members are inserted into the outer peripheral member, a first fluid pressure pipe is connected to a portion of the first inner peripheral member exposed from the outer peripheral member, and an outer peripheral portion of the second inner peripheral member is connected. Second on the part exposed from the member
And connected to the first and second fluid pressure pipes via an internal flow path formed inside each of the inner peripheral members and a through flow path formed on the peripheral wall of the outer peripheral member. A third fluid pressure pipe connected to the road is connected.

[0006] Further, in the aerial work apparatus according to the present invention, a swivel joint built in the post member is connected to the first inner peripheral member fixedly supported by being connected to the post member, and to the outer periphery of the first inner peripheral member. It comprises an outer peripheral member which is rotatably slidably connected to the worktable, and a second inner peripheral member which is rotatably slidably inserted into an upper portion inside the outer peripheral member and connected to the winch. Then, a boom-side fluid pressure pipe attached to the boom is connected to the first inner peripheral member, a winch-side fluid pressure pipe connected to the winch is connected to the second inner peripheral member, and a fluid pressure control valve is connected to the outer peripheral member. It is configured by connecting a worktable-side fluid pressure pipe connected to the boom-side and winch-side fluid pressure pipes.

[0007]

The swivel joint is constructed by inserting a plurality of (for example, two) independently rotating inner sliding members into an integrally formed outer circumferential member, and forming a plurality of separate swivel joints. It is built in the post member with a simpler support structure than using. When the workbench is turned in the above-mentioned high-altitude working device, the piping is obstructed by the flow path connection between the pump-side fluid pressure pipe and the valve-side fluid pressure pipe by the first inner peripheral member and the outer peripheral member. Never be. Further, the winch also smoothly rotates with respect to the boom and the worktable by the flow path connection between the worktable-side fluid pressure pipe and the winch-side fluid pressure pipe by the second inner peripheral member and the outer peripheral member.

[0008]

Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an aerial work vehicle using a swivel joint according to the present invention. The aerial work vehicle 10 is configured on the basis of a truck chassis, and a lower turntable 12 that can freely turn horizontally with respect to the vehicle body 11 is attached to a front portion of the vehicle body 11.
A boom 13 configured to be telescopically extendable and retractable is attached to the upper part of the lower swivel 12 so as to be able to move up and down. Further, a post member 14 is attached to the tip of the boom 13 so as to be swingable in the horizontal direction in the figure.

An upper leveling cylinder 15a is mounted between the post member 14 and the tip of the boom 13, and a lower leveling cylinder 15b is mounted between the base end of the boom 13 and the lower turntable 12. Have been. A hydraulic closed circuit (not shown) is formed between the leveling cylinders 15a and 15b. Lower leveling cylinder 15b extended and retracted by boom 13 that moves up and down
When the hydraulic oil is discharged from the cylinder, the hydraulic oil is supplied to the upper leveling cylinder 15a to cause the upper leveling cylinder 15a to expand and contract, thereby causing the post member 14 to swing. In this way, the post member 14 is always kept vertical regardless of the up-and-down state of the boom 13.

A pivot bracket 16 is mounted on the outer periphery of the post member 14. As shown in detail in FIG. 2, a protrusion 14 a that protrudes in a brim shape is formed at an intermediate portion in the vertical direction on the outer periphery of the post member 14, and the turning bracket 16 is provided on the upper surface of the protrusion 14 a.
It is rotatably mounted on the post member 14 via the bearing 16a. The turning bracket 16
Is driven to rotate by a hydraulic motor (not shown). 1 and FIG.
As shown in FIG. 1, a swing arm 17 extending laterally is attached, and the tip of the swing arm 17 is a worktable 18.
Is attached. Therefore, the worktable 18 can horizontally turn around the post member 14 with respect to the boom 13. The work table 18 includes the work table 1.
A worktable moving hydraulic control valve (not shown) for controlling the supply and discharge of hydraulic oil to and from a hydraulic actuator that operates the lower swivel 12, the boom 13 and the swivel bracket 16 to move the work 8 will be described later. A winch operating hydraulic control valve 19 for controlling the supply and discharge of hydraulic oil to and from the hydraulic winch motor 25m is mounted.

As shown in FIG. 2, the post member 14 is formed in a hollow cylindrical shape having a bottom surface 14b at a lower portion. The swivel joint 30 according to the present invention is mounted inside the post member 14. The swivel joint 30 has a lower end fixed to the center of the bottom surface 14 b, an upper end extending to a vertical intermediate portion of the post member 14, and a cylindrical inner peripheral member 31. A cylindrical outer peripheral member 32 rotatably slidably mounted.

An annularly extending groove 31a is formed at two upper and lower locations on the side surface of the first inner peripheral member 31. The lower end of the first inner peripheral member 31 has two openings 31.
b is formed. Further, inside the first inner peripheral member 31, two L-shaped internal flow paths 31c connecting the annular groove 31a and the opening 31b are formed. As shown in FIG. 1, boom-side hydraulic pipes H1 and H1 'are connected to the hydraulic pump P or the oil tank T mounted on the vehicle body 11 through the boom 13 to each opening 31b. .

The outer peripheral member 32 accommodates the first inner peripheral member 31 inside the lower half of the entire length, and the upper end extends slightly above the upper end of the post member 14. In a lower portion of the peripheral wall of the outer peripheral member 32, at a position facing each annular groove 31a of the first inner peripheral member 31, a lower through flow path 32a penetrating therethrough in the thickness direction is formed. Further, two upper through channels 32b similar to the lower through channel 32a are also formed in the upper portion of the peripheral wall of the outer peripheral member 32. And
The winch hydraulic control valve 1 attached to the worktable 18 is provided between the upper through flow path 32a and the lower through flow path 32b.
9 are connected to the workbench side hydraulic pipes H3 and H3 '.

At the upper end of the outer peripheral member 32 thus formed, a connecting plate 35 formed in a disk shape is attached so as to spread horizontally, and near the outer edge of the connecting plate 35, the turning bracket 16 The upper end is fixed. Connecting plate 3
Between the inside of the fixed portion of the turning bracket 16 in 5 and the upper end of the post member 14, a bearing 35a that supports the connecting plate 35 so as to be able to turn horizontally is attached. The outer peripheral member 3 thus connected to the turning bracket 16
2 slides relative to the first inner peripheral member 31 as the revolving bracket 16 (work table 18) revolves with respect to the post member 14, but each lower through passage 32a
Since it moves along 1a, it always maintains a communication state with the internal flow path 31c of the first inner peripheral member 31. For this reason, regardless of the turning position of the worktable 18, the boom side pipes H1, H
1 'and the workbench side pipes H3, H3' are connected in a flow path.

A second inner peripheral member 33 formed in a cylindrical shape is rotatably slidably inserted inside the upper half of the outer peripheral member 32. The second inner peripheral member 33 is fixed in the vertical direction by bringing the lower end surface into contact with the upper end surface of the first inner peripheral member 31. An annular groove 33a is formed on the side surface of the second inner peripheral member 33 at a position facing each upper through flow path 32b of the outer peripheral member 32, similarly to the first inner peripheral member 31. Two openings 33 b are formed at the upper end of the opening 33. And the second inner peripheral member 33
, Two L-shaped internal flow paths 33c connecting the annular groove 33a and the opening 33b are formed.

The upper swivel 21 is attached to the upper end of the second inner peripheral member 33. An arm bracket 23 is attached to the upper part of the upper swivel 21 so as to be able to move up and down.
5 is attached. Here, the upper swivel table 21 is driven to rotate by a hydraulic motor (not shown), and the winch bracket 23 is driven up and down by an upper up and down cylinder 24 attached to the upper swivel table 21. Also,
The winch 25 is driven by a hydraulic winch motor 25m attached to the bracket 23 for winding and feeding. And between the winch motor 25m and each opening 33b of the second inner peripheral member 33, the winch side hydraulic pipes H2, H
2 'is connected.

The second inner peripheral member 33 connected to the winch 25 in this manner is connected to the upper swivel 21 (the winch 25).
Pivots with respect to the post member 14 and the pivot bracket 16, the first inner peripheral member 31 and the outer peripheral member 33.
However, since each of the annular grooves 33a moves in opposition to each of the upper through flow paths 32b, the inner flow path 3
3c and the upper through flow path 33b maintain a communicating state. Therefore, regardless of the turning position of the winch 25, the workbench-side pipes H3, H3 'and the winch-side pipes H2, H2' are connected in a flow path.

A crane arm 26 is inserted and held at the middle of the winch bracket 23 in the vertical direction. The wire 25w paid out from the winch 25 hangs down via a sheave 26s rotatably attached to the tip of the crane arm 26, as shown in FIG. A hook 25f is attached to a lower end of the wire 25w.

An operator M can be mounted on the work table 18 of the aerial work vehicle 10 configured as described above, and the operator M can operate the work table moving hydraulic control valve by operating the aforementioned work table moving hydraulic control valve. Each operation of the lower swivel 12, the boom 13 and the swivel bracket 16 is controlled so that the lower swivel 12, the boom 13 and the swivel bracket 16 can be moved to an arbitrary height together with the work table 18. At this time, the boom side piping H
1, 1H1 and the workbench side pipes H3, H3 'are connected via the swivel joint 30, so that the swivel bracket 16 can smoothly perform 360 ° turning operation without obstructing these pipes.

Further, the operator M can operate the winch 25 to lift a heavy object (not shown) hooked on the hook 25f to a high place. At this time, there is a case where the upper swivel table 21 is swung to adjust the lifting position (horizontal position) with respect to the work table 18, but the work table side pipes H3 and H3 'and the winch side pipes H2 and H2'.
Are connected via the swivel joint 30, so that the upper turntable 21 can be turned 360 ° without these pipes being in the way.

In the above embodiment, only the hydraulic piping connected to the swivel joint for supplying and discharging hydraulic oil of the winch motor is shown. Needless to say, the hydraulic piping related to supply and discharge of hydraulic oil to and from the hydraulic actuator is also connected.

[0022]

As described above, the swivel joint of the present invention is constructed by inserting a plurality of (for example, two) independently rotating inner sliding members into an integrally formed outer circumferential member. Have been. For this reason, it is possible to incorporate the swivel joint into the post member with a simpler support structure than when using a plurality of separate swivel joints. In such a working device at a high place using a swivel joint, the first inner peripheral member and the outer peripheral member may interfere with the flow path connection between the pump-side fluid pressure pipe and the valve-side fluid pressure pipe. Not only can the worktable be smoothly swiveled horizontally with respect to the boom, but also the winch can be formed by the flow path connection between the worktable-side fluid pressure pipe and the winch-side fluid pressure pipe by the second inner peripheral member and the outer peripheral member. It is possible to smoothly turn horizontally with respect to the boom and the work table. Therefore, by using the work apparatus at a high place, the work table and the winch can be freely swiveled to perform the work efficiently.

[Brief description of the drawings]

FIG. 1 is a side view of an aerial work vehicle using a swivel joint according to the present invention.

FIG. 2 is an enlarged side view (partially sectional view) of an upper portion of the high-altitude working device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Aerial work platform 12 Lower turning table 13 Boom 14 Post member 18 Work table 19 Hydraulic control valve for operating winch 21 Upper turning table 25 Winch 30 Swivel joint 31 First inner peripheral member 32 Outer peripheral member 33 Second inner peripheral member H1 H3 hydraulic piping

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B66F 11/04 B66F 11/04 F16L 27/093 F16L 27/08 A

Claims (3)

(57) [Claims] 1. A fluid pressure pipe comprising an outer peripheral member, and an inner peripheral member rotatably slidably inserted into the outer peripheral member, and a fluid pressure pipe connected to the outer peripheral member and a fluid pressure connected to the inner peripheral member. A swivel joint for performing flow path connection with a pipe, wherein a plurality of the inner peripheral members are arranged in the axial direction of the rotational sliding and inserted into the outer peripheral member, and these inner peripheral members are respectively provided with respect to the outer peripheral member. A swivel joint characterized by being independently rotatable and slidable. 2. A first inner peripheral member and a second inner peripheral member are arranged in the axial direction of the rotational sliding and inserted into the outer peripheral member, and are exposed from the outer peripheral member in the first inner peripheral member. A first fluid pressure pipe is connected to the portion, a second fluid pressure pipe is connected to a portion of the second inner peripheral member exposed from the outer peripheral member, and the outer peripheral member is formed inside each of the inner peripheral members. A third fluid pressure pipe connected to the first and second fluid pressure pipes is connected via a formed internal flow path and a through flow path formed on a peripheral wall of the outer peripheral member. Item 2. A swivel joint according to item 1. 3. An up-and-down boom, a post member extending vertically and attached to the tip of the boom, a worktable and a winch independently and horizontally pivotally attached to the post members, respectively. A fluid pressure control valve attached to a base and configured to control supply and discharge of fluid pressure to and from the winch; and a fluid pressure pipe built in the post member and extending between the boom and the winch via the fluid pressure control valve. A swivel joint that performs flow path connection, wherein the swivel joint is connected to the post member and fixedly supported by a first inner peripheral member; and an outer periphery of the first inner peripheral member. An outer peripheral member which is rotatably slidably attached to the work table, and which is rotatably slidably inserted into an inner upper portion of the outer peripheral member; A second inner peripheral member to be connected; a boom-side fluid pressure pipe attached to the boom connected to the first inner peripheral member; and a winch side connected to the winch to the second inner peripheral member. A swivel joint, wherein a fluid pressure pipe is connected, and a valve-side fluid pressure pipe connected to the boom-side / winch-side fluid pressure pipe through the fluid pressure control valve is connected to the outer peripheral member. Working equipment at height using.