JPH0222807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an elevating boom that is extendable, pivotable, and hoistable, a vertical boom connected to the elevating boom so that it can pivot and be raised and lowered, and a vertical boom that is pivotable and rotatable with respect to the vertical boom. The present invention relates to an operating device for a type of bridge inspection vehicle having a fixed inspection platform.

A typical bridge inspection vehicle of this type is shown in Figure 1.

This bridge inspection vehicle is equipped with an elevating boom 1 that can be controlled to extend and contract (arrow A) and to raise and lower (arrow B) on a base P that is rotatably controlled around a vertical line and can be controlled to swivel (arrow C). are doing. A holding device 2 is provided at the tip of the elevating boom 1 so as to be controllable pivotably (arrow D), and 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 boom 3 so as to be rotatable (arrow F) controllable, and an inspection stand is attached to this support stand 4 so as to be extendable (arrow G) and pivotable (arrow H) controllable.

In addition, when this bridge inspection vehicle travels, the inspection platform 5 is pivoted counterclockwise in the figure so as to be juxtaposed to the vertical boom 3, and the vertical boom 3 and the inspection platform 5 are pivoted together with the holding device 2 in the counterclockwise direction in the figure. This makes it parallel to the elevating boom 1, and furthermore, the elevating boom 1, together with the vertical boom 3 and the inspection stand 5, is oriented in the longitudinal direction of the vehicle body.

Each of the above operations is operated in a known manner by suitable drive sources such as a hydraulic cylinder pump system and a hydraulic motor.

In such a bridge inspection vehicle, it is important for safety to suppress the swinging of the inspection platform 5 as much as possible. For this purpose, as shown in FIGS. 2A and 2B, a plurality of holes 4A are formed on the top wall of the support base 4 at appropriate intervals along the circumference, and corresponding to the holes 4A, self-weight (or springs, etc.) Pin 3 that fits in with the aid of pressing force
0 to be slidable on a holder 31, and it is preferable to provide a device or the like that stops rotation by fitting the pin 30 into the hole 4A when the inspection table 5 is in a predetermined direction. In this device, when rotating the inspection table 5, the pin 30 is pulled out by the hydraulic cylinder piston device 32 to start rotation, and the pin 30 is slid onto the support table 4 by its own weight at the required time. This allows the next hole 4
The pin 30 is inserted into A and rotation is stopped.

However, in the above configuration, pin 30
If the elevating boom 1 rotates, turns, and raises and lowers, and the vertical boom 3 pivots and moves up and down when the boom 1 leaves the hole 4A, the worker on the inspection platform 5 will be in an extremely dangerous situation. Furthermore, there is a high risk that the inspection table 5 may suddenly rotate and cause an accident.

The object of the invention is to provide a control arrangement or operating device which eliminates the above-mentioned dangers.

To this end, the present invention is characterized in that it is configured to detect the operating state of the rotation restraint device of the support stand, that is, the inspection stand, and to enable the operation of other booms and the like only when the rotation is restrained.

Embodiments of the present invention will be described below with reference to the drawings.

To explain this bridge inspection vehicle as a whole with reference to FIG. 1, it has outriggers 10 and 11 (only the rear two are shown), and here the protruding distance of the outrigger 10 to the side of the vehicle body is Limit switches LS1 to LS4 are provided for stepwise detection. In addition, limit switches or pressure sensitive switches LS5, LS are installed to detect ground contact by the wheels 12, 13 of the outriggers 10, 11, respectively.
6 is provided. On the other hand, the elevating boom 1 is equipped with limit switches LS7 to LS9 for detecting its extension distance step by step. In order to prevent the bridge inspection vehicle from overturning due to extension of the elevating boom 1, the outriggers 10 are equipped with limit switches LS1, LS2, and LS3.
The limit switches LS7, LS8, and LS9 are set in advance so that the limit switches LS7, LS8, and LS9 detect the respective allowable extension limits of the corresponding elevating and elevating booms 1 when the elevating boom 1 reaches the protrusion distance detected in the above.

These limit switches LS1 to LS9 are the third
As shown in the figure, magnet coils MLS1 to MLS9 and relays R1, R1', R2 to R9 are connected between power supply buses S1 and S2, respectively, and limit switch LS1, which is a detection switch, is connected between power supply buses S1 and S2.
~LS9 energizes the respective magnet coils MLS1-MLS9 when each is activated. Also, by energizing magnetic coils MLS1,...MLS9, relays R1 and R are activated, respectively.
1', R2 to R9.
Here, relays R1, R1', and R2 to R9 are normally open and closed by the energization of their respective magnetic coils, and relays R7 to R9 are normally closed and opened and separated by the energization of their respective magnetic coils. It's summery.

Here, the line a is closed only when the outrigger 10 is extended and the limit switch LS1 detects this, and when the limit switches LS5 and LS6 detect the grounding of the outriggers 10 and 11, and thereby the operation indicated by the reference numeral 100 as a whole is performed. Complete the device. The operating device 100 has a select switch 110, and by selectively operating the button, the magnetic coil M1 related to each operation is selected.
~M6 is energized, and the corresponding operation mode can be executed. Here, the magnetic coil M1 is used to raise and lower the inspection table 5, the magnetic coil M2 is used to rotate the inspection table 5, the magnetic coil M3 is used to extend the elevating boom 1, and the magnetic coil M4 is used to retract the elevating boom 1, and the magnetic coil M4 is used to retract the elevating boom 1. The magnetic coil M5 functions as a switch for raising and lowering the elevating boom 1, and the magnetic coil M6 functions as a switch for raising and lowering the vertical boom. Of course, various other connections can be made. Further, line b is connected so as to energize the magnetic coil M20 when the outrigger 10 is extended and the corresponding relay R1' to R4 is closed by the activated limit switch of the limit switches LS1 to LS4. ing. This magnet coil M20 here operates a switching relay R20 which is connected to the magnet coil M3. Therefore, when lines a and b are completed, for example, if the selection switch 110 is used to select the extension operation of the elevating boom 1, it becomes possible to execute it. However, when the elevating boom 1 attempts to extend beyond its permissible extension distance determined by the outriggers 10, the corresponding relays (R7 to R9) are opened, and in this case, the closure is released and the magnet coil is M20 is deactivated. Therefore, by cutting off line b, relay R20 is opened and magnet coil M3 is deenergized. Therefore, the elevating boom 1 cannot be extended any further.

A limit switch LS50 is shown as an example of a support restraint device such as that shown in FIG.
This limit switch LS50 has pin 30 in hole 4.
It is turned ON when it falls into A, i.e., when it gets stuck,
Further, it is set to turn OFF when the pin 30 is pulled out from the hole 4A, that is, when the engagement is released. This kind of limit switch LS50
The ON-OFF switching is easily performed by, for example, an engagement flange 30A formed on the pin 30, and thereby it is determined whether or not the rotation of the support base 4 can be stopped by turning the limit switch LS50 ON and OFF.

This limit switch LS50 is connected to a magnetic coil MLS50, as shown in FIG. 3, which shows the overall circuit configuration of the operating device.
The MLS50 is starting to gain momentum. This magnet coil MLS50 is for switching and controlling a relay R50, which closes line a and cuts off line c when limit switch LS50 is ON. Conversely, when it is OFF, it is configured to cut off line a and close line c.

With the lines a and c switched by such a circuit configuration, when the former is closed, M1 becomes standby (in a state where it can be operated by operating the select switch), and M1
2 is shut off regardless of the select switch. The reverse is also true. Therefore, permission or prohibition of the operation selectively selected by the select switch is controlled.

Therefore, in the illustrated configuration, the limit switch LS50 controls the magnets M1 and M2 in the operating device 100, which are responsible for energizing and deenergizing the operation circuit for the inspection table 5. In this way, in the configuration according to the present invention in which each circuit is switched based on the detection of each limit switch, for example, depending on whether lines a and b are completed or cut off and whether or not the rotation of the support base shown in FIG. 2A is stopped. By switching the relay R50, it is possible to control the rotation, extension, and elevation of the elevating boom 1 shown in FIG.

As described above, according to the present invention, it is possible to control permission/prohibition of various operation modes by engaging and disengaging the restraining device of the support stand. can all be resolved. In addition, the safety of operation is increased, and the significant effect of ensuring safe operation for workers can be obtained. still,
Of course, it is possible to switch between various operating modes other than the illustrated configuration.

[Brief explanation of drawings]

FIG. 1 is a rear elevational view of an embodiment of a bridge inspection vehicle.
FIG. 2 is a partial sectional view showing an embodiment of a rotation restraining device for an inspection table and a support table. FIG. 3 is a signal processing circuit diagram showing the overall circuit configuration of an embodiment of the operating device according to the present invention. 1... Elevation boom, 2... Holding device, 3... Vertical boom, 4... Support stand, 4A... Hole, 5... Inspection stand, 30... Pin, 31... Holder, LS1
~LS50...Limit switch, MLS1~MLS
50, M1~M6...Magnetic coil, R1~
R50...Relay, 100...Operation device.

Claims (1)

[Scope of Claims] 1. The vehicle body is provided with a base that is controlled to rotate about a vertical line, and a base end of an elevating boom that is controlled to raise and lower and expand and contract is attached to the base, and a tip end of the elevating boom is attached to the base. A vertical boom that is controlled to raise and lower is attached to the vertical boom, a support stand is rotatably provided at the lower end of the vertical boom, and a foldable inspection stand that is controlled to pivot and expand/retract with respect to the support stand is provided. In the bridge inspection vehicle according to the present invention, a restraining device capable of restraining the rotation of a support base with respect to the vertical boom is provided, a detection switch is provided for determining whether or not the restraint device is in a restrained state, and the detection switch is configured to control the rotation of the support base with respect to the vertical boom. Bridge inspection characterized by having an operation control circuit that enables raising and lowering of the inspection platform by an amount set in relation to a protruding distance of an outrigger provided on the vehicle body only when it is detected that the rotation of the bridge has been stopped. Car operating device. 2. The operating device for a bridge inspection vehicle according to claim 1, wherein the detection switch is a limit switch, and the operation control circuit is energized and cut off by a relay that is energized and controlled by switching of the limit switch. .