JP2549899Y2 - Manhole cover handling device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for handling a manhole cover in a lower water chamber of a rigid heat exchanger, for example.

[0002]

2. Description of the Related Art An attachment state of a lid of a lower water chamber manhole in a rigid heat exchanger will be described with reference to FIGS. FIG. 5 is a side view showing the state of movement of the manhole cover, and FIG. 6 is a side view showing a state where the manhole cover is attached.

In FIG. 5, a manhole in a lower water chamber of a heat exchanger is opened downward, and a manhole cover (lid) 1 is held by a lid receiving jig 2 and carried by a cart 3. A stud 5 is provided on a lid mounting surface of the lower water chamber 4 of the heat exchanger.

At the time of attaching the lid, the lid 1 is carried by the carriage 3 and the mounting hole is aligned with the stud 5. Thereafter, the studs 5 are inserted into the mounting holes, and nuts are screwed into the two diagonal studs 5 to temporarily fix the lid 1. After temporarily fixing the lid 1, the carriage 3 is moved away from the lower water chamber 4.

After the lid 1 is temporarily fixed, the wrench unit 6 is mounted on the trolley 3 which has been moved away, and the wrench unit 6 is brought close to the lid 1 so that all the studs 5 are tightened with the nuts 7 to thereby close the lid 1. Fix 1

When the lid 1 is to be removed, the operation is performed in a procedure reverse to the procedure described above. All of these operations of attaching and detaching the lid 1 are performed by the operator directly operating the wrench unit 6 and the like.

[0007]

Conventionally, in mounting and removing (handling) the lid 1, the lid 1 is moved and the nut 7 is tightened and loosened by the wrench unit 6. When the lid 1 is attached, the nut 7 is tightened with respect to the two diagonal studs 5 using a normal tool without using the wrench unit 6 in order to temporarily fix the lid 1. When the lid 1 is removed, the nut 7 is loosened using the wrench unit 6 while retaining the lid 1 while leaving the nut 7 for the two diagonal studs 5. Therefore,
The handling of the lid 1 is performed using a plurality of jigs (the lid receiving jig 2 and the wrench unit 6), and the work in tightening and loosening is divided into manual work and work using the wrench unit 6, respectively. It was bad. In addition, heat exchanger 4
The work environment was poor due to dust and the like, the lid 1 itself was on a heavy object, and the mounting surface was downward, and handling of the lid 1 was not a favorable operation for the worker in terms of work safety and health.

[0008]

According to the present invention, there is provided a cover receiving portion for holding a manhole cover,
An arm whose center in the longitudinal direction is rotatably supported by the lid receiving portion at the center position of the manhole cover, and boxes provided at both ends of the arm opposite to the fastening portion of the manhole lid and holding a fastening member. And box driving means for driving the box to tighten and loosen the fastening member.

[0009]

The manhole cover is held by the cover receiving portion, and the box is sequentially opposed to the diagonal fastening portion by rotating the arm, and the fastening member is tightened and loosened by driving the box driving means.

[0010]

1 is a side view of a manhole cover handling apparatus according to an embodiment of the present invention, and FIG. 2 is a detailed view of a box.

In FIG. 1, reference numeral 11 denotes a lid receiving portion for holding the lid 1, which is movably supported as described later. The lid 1 is fixed to and held by the lid receiving portion 11 by bolts 12 when the lid 1 is removed. A rotating portion 13 is provided at the center of the lid receiving portion 11, and a central portion in the longitudinal direction of the arm 14 is attached to the rotating portion 13. The arm 14 is rotatably supported at the center portion of the lid 1 by the lid receiving portion 11 at the center. Lid 1
Boxes 15 are provided at both ends of the arm 14 so as to face the insertion holes 1a of the studs 5 which are the tightening portions. The nut 7 as a fastening member is held in the box 15.

The detailed structure of the box 15 will be described with reference to FIG.

The box 15 includes a square shaft 16 and a shaft 17.
The piston 18 is fixed to the shaft 17 by a nut 19. The piston 18 moves inside the cylinder 20, and drives the box 15 in the axial direction. The cylinder 20 is fixed to the base 21,
The base 21 is integrated with the arm 14.

The square shaft portion 16 of the box 15 is supported by a bearing 22 and is slidable in the axial direction, and its rotation is restricted in the rotational direction by a ratchet mechanism (not shown). Bearing 2
2 is rotatably supported on a base 21 and a bearing 22
Is fixed to the lever 23.

A rotation cylinder 24 is mounted on the base 21, and a piston 25 of the rotation cylinder 24 is connected to one end of a lever 23 by a pin 26. Rotating cylinder 2
When the piston 25 expands and contracts by the drive of the lever 4, the lever 2
3, the box 15 rotates with respect to the base 21 (arm 14) via the bearing 22 and the square shaft portion 16. At this time, the expansion and contraction of the piston 25 is continuously rotated in one direction by the ratchet mechanism (not shown).

That is, the box driving means includes the rotating cylinder 24, the piston 25, the lever 23, the bearing 22, and the square shaft portion 16.

The operation of the manhole cover handling apparatus having the above configuration will be described. FIG. 3 shows the whole state during the handling operation, and FIG. 4 shows the whole state during the standby state.

The cover receiving section 11 is fixed to the guide device 27, and the manhole cover handling device is moved between a handling operation position and a standby position. The guide device 27 includes a rotating shaft 32 supported by a fixed column 31 and a telescopic case 33 attached to the rotating shaft 32.
A shaft 34 that extends and contracts inside, and a drive unit 35 attached to the shaft 34
And a shaft 37 mounted on the tiltable shaft 36 and extending and contracting in the case 37, and the lid receiving portion 11 is mounted on the tip of the shaft 37.

An operation for attaching the lid 1 to the manhole 40 will be described.

In the standby position shown in FIG.
And fix it with bolts 12. At this time, piston 1
8 is at the stroke end above the cylinder 20.

The lid 1 is positioned at the handling position shown in FIG. 3 by the guide device 27, and the lid 1 is fitted to the stud 5. The nut 7 is supplied to the stud 5. By lowering the piston 18, the box 15 is fitted to the nut 7. The piston 25 is reciprocated by the driving of the rotation cylinder 24, and the box 15 is intermittently rotated in one direction (tightening direction) via the lever 23, the bearing 22, the ratchet mechanism (not shown), and the square shaft portion 16. The boxes 15 at both ends of the arm 14 are simultaneously rotated, and the nuts 7 at the diagonal positions are simultaneously tightened.

When the tightening of the nut 7 is completed, the piston 18 is moved to the stroke end above the cylinder 20, and the box 15 is avoided from the stud 5 and the nut 7. The arm 14 is rotated with respect to the lid receiving portion 11 by the rotating portion 13, and the box 15 is made to correspond to the position of the adjacent stud 5. The box 15 is lowered again to tighten the nut 7.

By repeating the above operation, the nuts 7 are tightened for all the studs 5 at each diagonal position.

When removing the lid 1 from the manhole 40 for maintenance and inspection, the ratchet mechanism is set in the reverse direction, and all nuts 7 are loosened and removed in the reverse operation of tightening. The cover 1 is moved to the standby position by the guide device 27, and the front surface of the manhole 40 is opened to secure a work space.

In the above manhole cover handling apparatus, the cover 1
, While the nut 7 is tightened and loosened, and the lid 1 is easily handled. In addition, the guide device 27
, The cover 1 can be handled fully automatically.

[0026]

The manhole cover handling device of the present invention supports the arm rotating at the center position of the manhole cover on a cover receiving portion for holding the manhole cover, and has a box for fastening and loosening the fastening member at both ends of the arm. With this arrangement, the arm can be rotated while the manhole cover is held by the cover receiving portion, and the fastening member can be tightened and loosened by the box. As a result,
The number of manhole cover handling steps is reduced, and the labor of the operator can be reduced, so that work can be simplified and efficiency can be improved. Further, by using a device for positioning the manhole handling device with respect to the manhole, the manhole cover can be handled fully automatically, and there is no problem in work safety and health.

[Brief description of the drawings]

FIG. 1 is a side view of a manhole handling device according to an embodiment of the present invention.

FIG. 2 is a detailed explanatory view of a box.

FIG. 3 is an overall explanatory view during a handling operation.

FIG. 4 is an overall explanatory view during standby.

FIG. 5 is a side view showing a state of movement of a manhole cover in conventional handling.

FIG. 6 is a side view showing a mounting state of a manhole cover in a conventional handling.

[Explanation of symbols]

 Reference Signs List 1 Manhole cover (lid) 5 Stud bolt 7 Nut 11 Cover receiving part 13 Rotating part 14 Arm 15 Box 16 Square shaft part 17 Shaft part 18 Piston 20 Cylinder 21 Base 22 Bearing 23 Lever 24 Rotating cylinder 25 Piston 27 Guide device

Claims (1)

(57) [Scope of request for utility model registration] 1. A cover receiving portion for holding a manhole cover, an arm having a central portion in a longitudinal direction rotatably supported by the cover receiving portion at a center position of the manhole cover, and an arm facing a fastening portion of the manhole cover. A manhole cover handling device, comprising: boxes provided at both ends of the arm for holding a fastening member; and box driving means for driving the box to tighten and loosen the fastening member.