JPS6144749B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile ladder suspended traveling trolley used when working on the outer vertical wall surface of a covered cylindrical tank, that is, the outer circumferential wall surface, and more specifically, the present invention relates to a mobile ladder suspension vehicle used when working on the outer vertical wall surface of a covered cylindrical tank. The present invention also relates to a mobile ladder suspension traveling trolley in a covered cylindrical tank having a structure in which no rail for suspending the mobile ladder is provided near the tank.

This traveling trolley rotates on the upper surface of the canopy of the cylindrical tank, and as it travels, a mobile ladder suspended on the traveling trolley moves along the outer circumferential wall of the tank, and performs repairs and other operations on the outer circumferential wall of the tank. It is used for work.

By the way, the present inventor has already devised a running bogie (Utility Application No. 1160/1983, Utility Model Application No. 103494/1983), but the present invention solves the drawbacks of this running bogie and further improves the running performance. This makes it possible to easily move and hang the moving ladder without being obstructed by various protrusions fixed to the upper side of the outer peripheral wall of the tank.

In general, a traveling trolley on which a moving ladder is suspended is subject to a considerable amount of gravity, i.e., a load, such as the own weight of the moving ladder, the weight of the worker and the work equipment, etc. ).

However, the tank canopy on which the loaded trolley is placed is usually made of a soft thin steel plate, and as a result, uneven loads occur on the wheels of the running trolley, resulting in excessive extreme loads and If the entire truck is made to have a heavy load structure, there is a risk that the steel plate of the canopy will be damaged, which is not preferable.

Therefore, in order to avoid such dangers, it is necessary to install reinforcing scaffolding boards etc. around the wheel running parts of the traveling trolley, reduce the load on each wheel as much as possible, and concentrate the load on one point. It was necessary to distribute the load to prevent this.

By the way, in the traveling bogie developed earlier by the present inventor, all of the suspended load was applied directly to the traveling bogie, so efforts were made to make the traveling bogie large and heavy to increase its rigidity. However, the load was not applied uniformly to the wheels on the suspension side of the moving ladder. In addition, since the wheel axle of this traveling bogie was fixed to the bogie frame,
The structure made it impossible to change the direction of the wheels, and it was not smooth to run the bogie faithfully along the outer circumferential wall of the tank, which was not formed very precisely, because the running path could not be easily corrected. In addition, because the cart itself was not assembled accurately, it was difficult to rotate smoothly on the canopy while maintaining the same center as the turning position on the canopy that locks the traveling cart. .

For these reasons, unbalanced loads are likely to occur in the above-mentioned traveling trolley, and reinforcing scaffolding boards are essential to protect the tank canopy.Furthermore, since the traveling trolley has a large structure and is heavy, it is difficult to repair or inspect the tank. In order to disassemble and assemble the traveling cart on the canopy, it is necessary to subdivide the structure of the parts, which makes the mechanism complicated and time-consuming.

SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks and provide a highly practical traveling bogie with improved running performance.

Next, one embodiment of the present invention will be explained with reference to the drawings. Fig. 1 shows a traveling trolley A on which a moving ladder B is suspended.
In the overall side view, the traveling trolley is the canopy 2 of the cylindrical tank 1.
It is placed on. Reference numeral 3 is a truck frame of the traveling truck A, and a rope 24 for suspending the mobile ladder B.
The swinging arm 4 is provided with pulleys 17 and 18 at its tips, respectively, so that the arm can easily climb over the protrusion on the upper part of the outer peripheral wall of the tank without coming into contact with it.
4' is attached to a fixing plate 15 which is supported by pins 19 and 20, respectively, and is fixed to the truck frame 3, as shown in FIG. This swinging arm 4,
4' respectively have a ratchet winding and unwinding device 7.
is provided, and the mounting angle of the swinging arms 4, 4' is adjusted by the action of the ratchet winding and unwinding device 7.

A side roller arm 14 is suspended from a predetermined position of the swinging arm 4, and a side roller 16 is provided at the tip of the side roller arm in contact with the vertical wall surface outside the tank. Hang the side roller positioning rod 21 between them, and move the moving ladder B.
A part of the load is shared and borne by the government.

FIG. 2 is a front view of a movable ladder suspended on a traveling truck, in which an overhanging work floor 34 and a hanging chain 40 are added to the connecting rod 26 of the movable ladder described in the specification of Japanese Patent Application No. 170510/1983. A handrail is attached to the working side of the mobile ladder to expand the working range.

Fig. 3 is a perspective view showing how the traveling trolley placed on the canopy of the covered cylindrical tank is related to the turning position fixed to the top of the canopy, and how the movable ladder is suspended. . As shown in this figure, an overhanging work floor 34 and a hanging chain 40 are added to a movable ladder composed of a rope-like hanging device 32, a connecting rod 26, a work floor 33, a swing stopper 25, a lifting ramp 35, a touch roller 39, etc. The rope 24 to which the hanging fixture 23 is fixed is wound around pulleys 17 and 18 and connected to a pulley 29 of a swing device fixed to the top of the tank canopy, and is suspended from a swing rope guide 30 and an annular guide 31. has been done.

FIG. 4 is a partial side view of the movable ladder and the traveling cart. As is clear from FIGS. Since a part of the carriage is simply supported via a pulley, there is no need to increase the rigidity of the frame of the carriage, and the carriage can be made lighter than conventional carriages. Therefore, in the traveling trolley of the present invention, even if the structure of the parts is not so segmented, there is no problem that it becomes difficult to handle when carrying or assembling and disassembling. In addition, the hanging load including the mobile ladder's own weight and live load is the rope 24.
The tension is distributed and supported by the side rollers 16, the running wheels 8, the pulleys 29, the swing rope guide 30, the annular guide 31, etc. that make up the swing device, so the load that each wheel receives is extremely light.
Unbalanced loads are less likely to occur, and each wheel is made of soft material.
For example, rubber tires will not damage the tank canopy.

Next, the traveling truck is pulled by a pulley 29 using a rope 27, and a side roller arm 14 is suspended from a predetermined position of the oscillating arm 4. A roller 16 is provided. Therefore, in the case of a movable ladder suspended in the state shown in Figure 4,
When the mounting angle of the oscillating arm 4 is changed in the direction of the arrow A shown in FIG.
It swings away from the tank side wall in the direction of arrow B shown in the figure, making it possible to move while avoiding the tank side wall and the protrusions on the upper side.

In addition, when moving the moving ladder configured in the state shown in FIG. parts can be passed through.

In addition, if a length adjusting device such as the follower 28 is interposed between the traveling trolley and the pulley 29 or between the pulley 18 and the pulley 29, the hanging position of the mobile ladder can be adjusted, making the work easier. The height of the floor 33 can also be adjusted, making it very easy to work on the outer circumferential wall of the tank, making it easy to adjust the leveling of the work floor 33 and to adjust the traveling of the traveling truck along the outer circumferential wall. In addition, the lengths of the moving ladder and the rope can be individually adjusted, which allows the moving ladder to be moved more accurately.

FIG. 5 is a plan view showing a control system of a direction changing mechanism for running wheels mounted on a running truck. In a traveling bogie having side rollers that run in contact with the tank outer peripheral wall surface as in the present invention, the running wheels 8 of the bogie frame are restricted in their movement direction on the canopy by the side rollers, so that they run relative to the bogie frame. If the wheels 8 and the traveling wheel shaft 13 are fixed, it is difficult for the rotating device fixed to the top of the canopy and the traveling truck to rotate while maintaining complete concentricity. This is a conclusion drawn from the tank forming technology, the precision of the turning device, and its fixing technology.If the running wheels are fixed to the bogie frame as in the case of a conventional running bogie, the side rollers and the running wheels causes a wedge effect, making it impossible to expect smooth rotational movement.

In the present invention, the direction of the running wheel shaft 13 can be corrected using the handle 12 via the gear 11, the tie rod 10, and the king pin 9 to change the direction of movement of the wheel 8. As a result, smooth rotational running is achieved. made possible. Preferably, two sets of handles 12 are provided so that the front and rear running wheel axles 13 can change direction independently.

Therefore, the present invention not only solves the drawbacks of conventional trolleys and improves the running performance of the traveling trolley to achieve the purpose stated in the title, but also allows the movable ladder to remain suspended depending on the way the pulleys and ropes are routed. It has excellent effects such as being able to add new functions such as allowing easy passage through protrusions on the upper side of the outer peripheral wall of the tank.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a moving cart on which a moving ladder is suspended, Fig. 2 is a front view of the moving ladder suspended on the moving cart, Fig. 3 is an enlarged perspective view of the moving cart and moving ladder, and Fig. 4 is an enlarged perspective view of the moving cart and moving ladder. Enlarged side view of the moving ladder and traveling trolley,
FIG. 5 is a plan view showing the control system of the direction changing mechanism for the running wheels. A... Traveling trolley, B... Moving ladder, 1... Tank, 2... Canopy, 3... Dolly frame, 4, 4'
... Swinging arm, 5,6... Angle variable chain,
7... Ratchet winding unwinder, 8... Running wheel, 9... King pin, 10... Tie rod, 1
1... Gear, 12... Handle, 13... Traveling wheel shaft, 14... Side roller arm, 15...
...Fixing plate, 16...Side roller, 17, 18
... Pulley, 19, 20 ... Swing arm support pin, 21 ... Side roller positioning rod, 22 ...
Side roller horizontal shaft, 23... Hanging fixture, 24...
rope.

Claims (1)

[Scope of Claims] 1. In a traveling trolley that moves on traveling wheels over the canopy of a covered cylindrical tank, two swinging arms with variable installation angles are provided on the trolley frame of the running trolley, and the tips of the swinging arms are A pulley is provided on the oscillating arm, and a ratchet winding unwinder is provided for adjusting the mounting angle of the oscillating arm, and a side roller arm is suspended from a predetermined position on one of the oscillating arms,
A side roller is provided at a position where the tip of the side roller arm is in contact with the vertical wall surface outside the tank, and a side roller positioning rod is hung between the side roller arm and the oscillating arm, and is connected to a pulley of a rotating device on the tank canopy. 1. A suspension traveling trolley for a movable ladder for working on an outer vertical wall of a covered cylindrical tank, characterized in that a suspended rope is wound around the pulley and a hanging device for suspending the movable ladder is attached to the lowest end of the pulley. 2. Suspension of a movable ladder for working on the outer vertical wall of a covered cylindrical tank according to claim 1, wherein the running wheels and side rollers are formed of a soft material, and the direction of the running wheel shaft can be changed by a handle. Running trolley. 3. A suspended traveling trolley for a movable ladder for working on the outer vertical wall of a covered cylindrical tank as set forth in claim 1, wherein the length of the rope from which the movable ladder is hung can be adjusted individually. 4. A suspended traveling trolley for a movable ladder for working on an outer vertical wall of a covered cylindrical tank according to claim 1, wherein the side rollers are detachable from the side roller arms.