JPS594710A - Apparatus for preventing lateral falling of bridge inspection vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing a bridge inspection vehicle or the like having a boom from overturning due to boom operation.

When extending and rotating the boom of a bridge inspection vehicle, aerial work vehicle, etc., a large overturning moment is generated not only in the loading state but also in the cyan loading state.
Safety measures to prevent rollovers are important. Typically, this type of vehicle is equipped with auxiliary support devices or outriggers.
The outriggers protrude to the side of the vehicle body and are lowered to touch the ground, thereby providing a fulcrum that can withstand the overturning moment and prevent the vehicle from overturning.

However, in the past, although outriggers were provided, the boom could be extended regardless of whether the outriggers were securely set, and there remained a risk of overturning. Furthermore, depending on the situation at the site, the protrusion distance of the outrigger may be limited, and in such cases, it may be difficult to know the safe extension limit of the boom, making the work dangerous.

The object of the present invention is to provide a device that can solve the above-mentioned dangers and reliably prevent rollovers.

To this end, the present invention presets the boom extension limit relative to the outrigger protrusion distance, detects the completion of the IJ gear protrusion operation and grounding, and enables the boom extension operation. Based on the detection of the protrusion distance, the boom can only be extended within the corresponding boom extension limit. An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 1 shows a bridge inspection vehicle equipped with the rollover prevention device of the present invention in its operating state. This bridge inspection vehicle has an elevating poom that can be controlled to expand and contract (arrow A) and raise and lower (arrow B).
It is equipped to enable rotation (arrow C) control. Elevating boom l
At the tip of the vertical boom 3, a vertical boom 3 is held by the holding device 2 so as to be controllable up and down (arrow E). A support stand 4 is provided at the lower end of the vertical pool 3 so as to be controllable in rotation (arrow F), and an inspection stand 5 is attached to this support stand 4 so as to be controllable in expansion and contraction (arrow G) and pivoting (arrow H). , the inspection table 5 has a handrail 9
5' is erected. Similarly, the handrail 5' can also be made foldable. When driving the bridge inspection vehicle, the inspection platform 5 is rotated to the left (arrow F) in the figure, and then clockwise (arrow H).
) to overlap the vertical pool 3, and the vertical pool 3 is raised together with the inspection table 5 (arrow E), and the holding device 20 is pivoted clockwise (arrow D°) in the figure. The elevating boom 1 is placed in a state parallel to the elevating boom 1, and the elevating boom 1, together with the vertical poom 2 and the inspection table 5, is oriented in the longitudinal direction of the vehicle body (arrow C).

This bridge inspection vehicle also has an IJ Gar 10.11 (the left and right rear ones are shown here). Here, only one outrigger 1O is provided so as to be able to control its operation so as to protrude toward the side of the vehicle body (arrow ■), so that the wheel 12 serving as a fulcrum can be lowered to touch the ground. Of course, the other outrigger 11 can also be controlled in a similar manner. Also, outrigger 10,1
1 is equipped with wheels 12 and 13'i, so the working condition (
It is also possible to continue driving as shown in Figure 1).

The above-mentioned operations are performed by suitable drive sources such as a hydraulic cylinder piston device and a hydraulic motor, and can be controlled by operating buttons or the like on an operation panel provided on the vehicle body.

According to the present invention, a plurality of limit switch LSIs are provided to detect the protrusion distance of the outrigger 10.

LS2, LS3, and LS4 are attached to the outrigger holding tube 20. Here, the left outrigger
Although four limit switches are shown for No. 10, the right side can also be configured in a similar manner, and the number of cylinders is not limited to four. For example, as shown in FIG. It is possible to have a structure in which the contact YON-OFF is made by the press pin 23 as if there is no detection. In this case, by determining the positions of the limit switches LSI to LS4, the protrusion distance A1v t1+ t2 t Al+ t2 + A can be changed in stages from the storage position to the maximum protrusion position as shown in FIG.
s r tl+ t2 +1-s + t4'? : Can be detected. In this way, the limit switch LSI-LS4 detects the protrusion distance of the outrigger 10 in preset steps.

The wheels #-10 and #-11 are also equipped with pressure-sensitive switches LS5 and LS6, respectively, to detect when the wheels 12 and 13 have been lowered and touched the ground.

The elevating boom l has multiple (
Here, there are three limit switches LS7゜LS8,
These limit switches are the limit switches L provided in the outrigger holding cylinder 20.
A similar detection method can be adopted with the same structure as SI to LS4. However, other configurations are of course possible.

By the way, in order to prevent overturning, the overturning moment ■ must be smaller than the stability moment MS, and these moments) m and MS are the protrusion distance of the IJ girl lO when considering the work shown in Figure 1. varies depending on
If the moment ratio Ms/MR>1 at each protrusion distance, the vehicle will not roll over. Here moment ratio MS/MR'';
1.3 as a reference, the allowable extension limit of the elevating boom 1 for each protrusion distance is calculated in advance. And a limit switch LS7 for detecting the extension distance of the elevating boom 1 mentioned above. LS8゜LS9 are respectively around) I
J girl lO protrusion distance t1+11+ 12. t1+
The f\γ device is set in advance to detect the extension distance corresponding to the allowable extension limit at t2+18.

The limit switch LSI-LS4 for detecting the protrusion distance of such a l-IJ gar 10, and the elevating boom l
The extension operation of the elevating boom 1 is controlled as shown in FIG. 4 based on the detection signals of the limit switches LS7 to LS9 for detecting the extension distance of the limit switch LSI as shown in FIG.
-LS4, pressure sensitive (or limit l-) switch LS5°L
S6 and limit switches LS7 to LS9 are each normally open, and when turned on, each VC relay R1
~R9 and R1' magnet Koino L/MLS1~
Connected to energize MLS9. Here, relays R1, 'R1', and R2-R6 are closed or turned ON when magnet coils MLSI-■1ss6 are energized, respectively, and relays R7 to R9 are closed when magnet coils MLS7 to MLS9 are energized, respectively. It is configured so that it opens, that is, turns OFF, when the

Relays R1, R5, R6 are connected in series and are shown by line a. Also, relays R1' and R7, R2 and R8, R3 and R
9 are connected in series, and these and relay R4 are connected in parallel as a whole, and connected to line b. The outputs of these lines a and b are input to a boom operator 100 provided on the operation panel. , and lines a and b, it is possible to execute or reject an operation, for example, an extension/retraction control of the elevating boom l. Boom operator 100 (l-, for example, select switch 11
By operating the 0 button group, you can selectively set the required operating mode (elevating boom l, elongation, extension, etc.), and each magnet is activated to fully operate the hydraulic cylinder and pulp mechanism for controlling the hydraulic motor. It is configured to energize coils (here M1 to M6? shown). Here, for example, the magnet coil Ml opens and closes the inspection table 5, M2 rotates the inspection table 5, M3 extends the elevating boom l, M4 retracts the elevating boom l, M5 raises and lowers the elevating boom l, and M6I /'i This is a magnet coil for raising and lowering the vertical pool 3.

The rollover prevention device including the illustrated circuit of limit switches LSI to LS9 and associated relays R1 to R9 operates as follows.

That is, as shown in Fig. 1, the elevating boom 1' (+
- When extending, if outrigger 1o is not protruded in advance and both outrigger 11 and outrigger 11 are not grounded,
Limit switch LSI, LS5.

At least one of LS6 is open (OFF). Therefore, the magnetic coil ML, Sl, MLS5 or (and) 'I' corresponding to the limit switch which is OFF
aS 6 is not energized and relays R1, R5 or (and) R6 are also OFF so that line a is not completed.
Even if the ' is extended, the operation will be prevented and the risk of rollover will be eliminated. Here, the relay R50 is actuated by a magnet coil ML850K that is energized and deenergized by a limit switch 50 that detects the fixed rotation of the inspection table 5, and when the inspection table 5 is fixed, the relay R50 is activated. R5
0 is closed.

The line a is completed when the outrigger 10 is extended a distance t1 as a first stage, both the outrigger 11 and the outrigger 11 are grounded, and the inspection table 5 is pivoted and fixed. On the other hand, in line b, R1' of relays R1' to R4
Since only the relay R7 is turned ON, an output is given to the boom operating device 100 through the normally closed relay R7. This causes magnet coil M20 to operate and close relay R20k which connects magnet coil M3i4. Since the function of this magnet coil M3 completely completes the connection to the elevating boom lvc, it becomes possible to extend the selectos. However, when it is stretched to the allowable limit and limit switch LS7 detects this, magnet coil MT and S7 are energized and relay R7 is opened (OFF).
is unconcluded, and the magnetic coil M20 o Pg
Since the relay R20 is opened and released by the force (the magnet coil M3 is deenergized), further extension of the elevating boom 1 is prohibited.

Next, the protrusion distance of the outrigger 10 is L as the second stage.
1+t2 K and both the outrigger 11 and the outrigger 11 are grounded, line a is completed. On the other hand, in line b, R1' and R2 of IJ relays R1' to R4 are activated by limit switches LSI and LS2. is O
N, and line b is completed through the normally closed relays R7 and R8, respectively.This allows the elevating boom 1 to be extended.0 The elevating boom 1 is extended to the allowable limit in the first stage described above. When limit switch LS7 detects this, relay R7 is opened (OFF). However, since relay R8 is closed, line bU still maintains the complete state, and limit switch LS8 detects that the elevating boom 1 has been extended to the allowable limit of the second stage, allowing the elevating boom 1 to further extend. Then, magnet coil MLS8 is energized, and relay R8 is opened (OFF). The line is released from completion by this fl, and therefore, the relay R20 is opened by deenergizing the magnet coil M20, and the elevating boom 1 is prohibited from further extending. ast
1+t2+As, and when both the outrigger 11 and the outrigger 11 are grounded, line a is completed, and relays R1', R2, and R3 are closed and completed in line b. Similarly, The elevating boom l cannot be extended until limit switch LS9 is actuated and relay R9 is opened, thereby ensuring extension up to the permissible limit in the third stage and preventing extension beyond this limit. .

Furthermore, when the IJ gar 10 is protruded to the maximum extent, the elevating boom °1 can be extended to that limit.

In this embodiment, the t1 protrusion and the grounding of the outrigger 10 are the prerequisites for the boom extension, but the present invention is not limited to this. (When retracting the first elevating poom 1 in the storage direction, there is no risk of it overturning with this operation, so
It can be connected to the magnet coil M4 for retracting the elevating boom 1 without intervening a release switch like the relay R20.As described above, according to the present invention, the outriggers can be protruded according to the site. Since the extension limit of the elevating boom is determined safely and reliably with respect to the amount of the elevating boom, an advantageous effect on safety can be obtained.

[Brief explanation of drawings]

FIG. 1 is a rear elevational view showing a bridge inspection vehicle equipped with the rollover prevention device of the present invention, which is an embodiment of the present invention. FIG. 2 is a partial sectional view showing a schematic structure of an embodiment of a limit switch. FIG. 3 is a partial explanatory diagram schematically showing the protrusion of the outriggers and the arrangement of limit switches for detecting the protrusion. Fig. 4 is a circuit diagram schematically showing the signal processing circuit using each limit switch of the lateral (prevention device) in the bridge inspection vehicle shown in Fig. 1. Elevation boom 2...
・・・・・・・・・・・・Holding device 3・・・・・・・・・
・・・・・・Vertical boom 4・・・・・・・・・・・・
...Support stand 5...Inspection stand 10.11...Outrigger 12,13...Wheel 20......・Holding tube 22e-...Shoulder 23...Press pin 100...
...Boom operator LSI~LS9...Limit switch MISI~MLS9...Magnet coil M
1 to M6, M2O, M2O... Magnet coil R1 to R9, R20, R50... Li -〇 Figure 3 Procedural Amendment (Method) October 1981 2811 Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office ■, 1! Table No. 1 of 1 Patent Application No. 114512 filed in 1982 2 Name of the invention Rollover prevention device for bridge inspection vehicles, etc. 3 Person making the amendment Relationship with the Jf matter Appointment of patent applicant Office Otemachi, Chiyoda-ku, Tokyo 1-3-1 people
Name: Ministry of Construction, Kanto Regional Construction Bureau, Atsushichibu Unenaka (
fJl 1 person) Ilul+ no JU (no change in content) 8 Attached documents drawings (Fig. 4) 1 copy of procedural amendment 1. Indication of tenancy Patent Application No. 114512 of 1982 2 Name of the invention Rollover prevention device for bridge inspection vehicles etc. 3 Relationship to the case of the person making the amendment Patent applicant address 1-3-1 Otemachi, Chiyoda-ku, Tokyo Name Hai (Name) Ministry of Construction Kanto Regional Construction Bureau 1) Jun Naka Department 7
(1 other person) 4. Agent

Claims (2)

[Claims] (1) A rollover prevention device for a vehicle such as a bridge inspection vehicle, which has a telescopic boom and an outrigger 1 for forming a fulcrum at a position protruding to the side of the vehicle body, which prevents the outrigger from grounding or The first means includes a first means for detecting completion of a grounding and an ejection operation, a second means for detecting an ejection distance of the outrigger, and a third means for detecting an extension distance of the boom. The control circuit is configured to energize the control circuit so as to enable the boom to be extended in response to the detection signal by the second means, and to enable the boom to be extended within a predetermined permissible limit in response to the detection signal by the second means. An overturn prevention device for a bridge inspection vehicle, etc., characterized in that it is configured to energize the control circuit and to interrupt the control circuit so as to disable the extension operation when the set permissible limit is exceeded by the third means. (2) Align the first set of multiple relays that are turned on depending on the horizontal extension of the outrigger and the second set of multiple relays that are turned off depending on the amount of extension of the boom. are connected in series to correspond to the amount of extension of the outriggers, and when the amount of extension of the boom exceeds a set limit with respect to the amount of extension of the outriggers, the plurality of relays of the second set are configured to interrupt the extension operation circuit. An overturn prevention device using a boom for a bridge inspection vehicle, etc., as set forth in claim 1.