JP3335761B2 - Shaft handrail opening / closing device for portal crane passage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a portal crane passage portion which is effective when, for example, a traveling rail of a portal crane laid near a shield start shaft is laid so as to cross a handrail surrounding the periphery of the shaft. And a vertical shaft handrail opening and closing device.

[0002]

2. Description of the Related Art For example, a safety handrail is provided around a shaft shaft of a shield start shaft or the like to prevent the shaft from falling down. In many cases, the traveling rail of the portal crane is laid so as to cross the handrail surrounding the periphery of the shaft. Therefore, in such a portion where the running rail crosses the handrail, the handrail could not be fixedly provided there, and the portion was a missing portion.

Conventionally, the part where the running rail crosses the handrail,
As a safety measure for the missing portion of the handrail, a method has been adopted in which the member is detachably attached using an opening / closing member such as a pipe material or a chain, and is manually removed when passing through a portal crane.

[0004]

However, such manual operation of attaching and detaching the opening / closing member for the defective portion of the handrail often involves human errors such as forgetting to remove or forget to close it. There was a problem that was not an effective prevention measure. In particular, since the safety railing of the shaft is an important equipment for disaster prevention, some effective measures against this point have been desired.

[0005] The present invention has been made in view of the above points, to improve the safety by automatically opening and closing the missing part of the handrail surrounding the perimeter of the shaft, An object of the present invention is to provide a vertical shaft handrail opening / closing device for a portal crane passing portion which can prevent damage to an opening / closing member and accompanying damage to a handrail when passing through a crane.

[0006]

The invention according to claim 1 is
A gantry handrail opening / closing device for a portal crane passage portion, in which a traveling rail of a portal crane is laid across a handrail surrounding the perimeter of the shaft, wherein the handrail at the portion where the traveling rail traverses is used as a leg of the portal crane. Forming an opening by opening with a width larger than the width of the portion, a sliding handrail for opening and closing the opening is provided in a handrail portion adjacent to the opening so as to be horizontally movable via a driving mechanism, Near the handrail, detecting means for detecting the position of the legs of the portal crane, outputting an open signal of the opening to the drive mechanism, and outputting a close signal when not detected. I have.

[0007]

According to the first aspect of the present invention, when the detecting means provided near the handrail detects the position of the leg of the portal crane, the detection signal is transmitted to the drive mechanism. , Whereby the drive mechanism operates to move the slide handrail horizontally in the opening direction. When the detecting means does not detect the leg of the portal crane, a closing signal is output and the sliding handrail moves horizontally in the closing direction.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in the plan view of FIG. 1 and the front view of FIG. 2, the traveling rail 1 of the portal crane K moves the handrail 2 surrounding the shaft T as shown in the plan view of FIG. A vertical shaft handrail opening and closing device which is laid in a crossing manner, wherein a handrail 2 at a portion where the traveling rail 1 crosses is entirely opened with a width w larger than a width of a leg 3 of a portal crane. An opening 4 is provided, and a slide handrail 5 for opening and closing the opening 4 is provided in a handrail portion adjacent to the opening 4 so as to be horizontally movable via a driving mechanism 6. Then, the position of the leg 3 of the portal crane K is detected, and the drive mechanism 6 detects the position of the opening 4.
And a detecting means 7 for outputting a closing signal when no detection is performed.

Next, the details will be described. In the embodiment, the left running rail 1 of the pair of left and right running rails 1 of the portal crane K crosses the handrail 2 at a right angle. The opening and closing device according to the present invention is provided in the handrail 2 there.

That is, as shown in FIG. 2, supporting columns 8a and 8b are erected on the left and right sides of the traveling rail 1 with an interval having a width w larger than the width of the leg 3 of the portal crane K. The opening 4 is formed by removing the horizontal rail and the like. A slide handrail 5 having upper and lower horizontal rails 5a, 5b and a vertical rail 5c connecting the rails is shown in a phantom line in the figure at a portion of the handrail 2 adjacent to the opening 4 via a drive mechanism 6. Is provided so as to be slidable in the horizontal direction so as to open and close the opening 4 as described above.

In this embodiment, an air jack 6a is used as the drive mechanism 6, and the tip of a rod 6b is connected to the vertical rail 5c of the slide handrail 5. This air jack 6
a is connected to a compressor (not shown) via an accumulator 6c. In addition, near the handrail 2 and immediately beside the traveling rail 1 on the right side, a portal crane K
Detection means 7 for detecting the position of the leg 3 and outputting an open signal of the opening 4 to the drive mechanism 6 and outputting a close signal when no detection is performed. In this embodiment, for example, a limit switch or the like is used as the detection means 7, and the ON and OF signals of the limit switch are input to the control panel of the air jack 6a so that the air jack 6a is operated. ing.

In the vertical shaft opening / closing apparatus for the passage of the portal crane constructed as described above, when the portal crane K is at a position sufficiently distant from the handrail 2 surrounding the vertical shaft T, the sliding handrail 5 is assumed to be imaginary in FIG. It is in a closed position indicated by a line, and the opening 4 is in a closed state.

The portal crane K travels and approaches the handrail 2, and the leg 3 of the portal crane K is connected to the limit switch 7.
, The mitt switch 7 is activated and the leg 3
Is detected. This detection signal is supplied to the control panel, whereby the air jack 6a operates to move the sliding handrail 5 horizontally in the opening direction as shown by the solid line in the figure.
The opening 4 is set to the open state.

When the portal crane k turns back and moves away from the handrail 2 and the position of the leg 3 is not detected by the limit switch 7, the air jack 6a operates to move the slide handrail 5 in the closing direction. Then, the opening 4 is closed.

As described above, according to this embodiment, the opening of the handrail necessary for passage of the portal crane can be automatically opened and closed. Therefore, there are many human mistakes of forgetting to remove or close the handrail, as in the past, when manually attaching and detaching the opening / closing member of the defective part of the handrail, which is an effective preventive measure for safety measures. Although there was a problem that was not described above, it was possible to automatically open and close the missing part of the handrail surrounding the perimeter of the shaft, thereby improving safety and ensuring reliability, as well as passing through the crane It is possible to prevent damage to the opening / closing member and accompanying damage to the handrail at the time.

In the embodiment, an example in which a limit switch is used as the detecting means has been described. However, it is needless to say that the detecting means such as an optical sensor may be used.

[0017]

As described above, according to the vertical shaft handrail automatic opening / closing device of the portal crane passage portion according to the present invention, the following excellent effects are obtained.

[0018] In the invention according to claim 1, the traveling rail of the portal crane is a vertical rail handrail opening / closing device for a passage portion of a portal crane which is laid so as to cross a railing surrounding the shaft. The handrail that crosses
An opening is formed by opening the door crane with a width larger than the width of the leg of the portal crane, and a sliding handrail for opening and closing the opening is horizontally moved to a handrail portion adjacent to the opening via a drive mechanism. Detecting means for detecting the position of the leg of the portal crane, outputting an open signal of the opening to the drive mechanism, and outputting a close signal when no detection is performed, near the handrail. With this configuration, the opening of the handrail required for passage of the portal crane can be automatically opened and closed.

Therefore, when manually attaching and detaching the opening / closing member for the defective portion of the handrail as in the prior art, there are often human errors such as forgetting to remove or forget to close, which is effective in safety measures. There was a problem that was not a preventive measure, but in this way, it is possible to automatically open and close the missing part of the handrail surrounding the perimeter of the shaft, thereby improving safety and ensuring reliability. In addition, it is possible to prevent damage to the opening / closing member and the accompanying damage to the handrail when passing through the crane.

[Brief description of the drawings]

FIG. 1 is a partially omitted plan view showing an embodiment of the present invention.

FIG. 2 is a partially enlarged front view showing the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running rail 2 Handrail 3 Leg 4 Opening 5 Slide handrail 6 Drive mechanism 7 Detecting means

Continuation of the front page (56) References JP-A-5-113040 (JP, A) JP-A-50-90066 (JP, A) JP-A 62-69000 (JP, U) JP-A 55-61166 (JP , U) Shokai Sho 62-182400 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04F 11/18 E04G 1/26 E04G 21/32

Claims (1)

(57) [Claims] 1. A vertical shaft handrail opening / closing device for a portal crane passage portion, wherein a traveling rail of a portal crane is laid so as to cross a handrail surrounding the perimeter of a shaft, wherein a handrail at a portion where the traveling rail crosses, An opening is formed by opening the door crane with a width larger than the width of the leg of the portal crane, and a sliding handrail for opening and closing the opening is horizontally moved to a handrail portion adjacent to the opening via a drive mechanism. Provided as possible,
Near the handrail, detecting means for detecting the position of the leg of the portal crane, outputting an open signal of the opening to the drive mechanism, and outputting a close signal when not detected. Vertical shaft handrail opening / closing device for portal crane passage.