JPH05147889A - Pressure-proof detecting method for ground plane by means of float of outrigger and device therefor - Google Patents

Abstract

PURPOSE:To detect the extent of pressure resistance on a ground plane directly almost at the same pressure as in an actual material handling operation state by supporting a crane truck on the ground plane of a material handling operation range through a pressure-proof detecting float in a small ground plane area, and operating an expansion in the no-load state. CONSTITUTION:A required ground contact areal float 6 is installed in the lower part of a vertical support leg at the end of an overhang beam 2 of an outrigger 1 in a crane truck, while a pressure-proof detecting float 12 of a ground contact area narrower than the ground contact area of the float 6 is installed in a central part of the float 6 retractably from the underside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an outrigger flower.
Method and apparatus for detecting the withstand voltage of a ground surface by a switch,
Before the cargo handling work with the telescopic boom of the crane vehicle, check whether the grounding surface on which the outrigger float of the crane vehicle is provided has the pressure resistance necessary to support the crane vehicle. , The crane car is supported by the pressure detection float of the outlicer, or in the state where the crane car is supported by the pressure detection float, the expansion boom is not loaded. , It is detected by performing an operation similar to the operation in the load suspended state on the telescopic boom, and accidentally tilting or overturning of the crane vehicle due to insufficient pressure resistance of the ground contact surface is prevented. The present invention relates to a method and an apparatus for detecting the breakdown voltage of a ground plane by means of an outrigger float, which is made possible.

[0002]

2. Description of the Related Art Generally, in order to stably support a crane vehicle on the ground in its cargo work area, an outrigger is provided on a vehicle body base of the crane vehicle, and an overhanging beam of the crane is provided. It is usual that the crane vehicle is extended before the cargo handling work by the crane vehicle, and the float provided at the end of the vertical support leg is grounded to support the crane vehicle.
On the ground of the loading and unloading work area of the crane vehicle, in particular, on the ground where the outrigger float of the crane vehicle is placed, the outrigger float of the crane vehicle, and thus the crane vehicle, of course, should be used. In addition, sufficient pressure resistance is required to support the load during cargo handling work.

For this reason, in the past, it has been specially considered that the pressure resistance of the ground of the cargo work area by the crane vehicle is sufficient to support the outrigger float of the crane vehicle. If the pressure resistance is unknown, prior to the cargo handling work by the crane vehicle, on the ground (at least four places) in the area where the outrigger float is placed, for example,
The pressure resistance of the ground in the area is detected by inserting a pressure resistance detection rod (not shown) of about several tens of centimeters and inspecting, and if the pressure resistance is not sufficient, lay a floor board having sufficient pressure resistance in the area, It was supposed that the cargo handling work should be started after taking some measures such as improving the pressure resistance.

In some cases, a grounding plate having a grounding area considerably larger than the grounding area of the outrigger float is detachably mounted below the outrigger float (mounting board) of the crane vehicle. It has already been proposed (see, for example, Japanese Utility Model Publication No. 51-46735), and by installing this ground leveling surface under the outrigger float as necessary,
The grounding pressure per unit area of the ground leveling is made lower than the grounding pressure per unit area by only the above-mentioned float to support the crane vehicle.

[0005]

However, as described above, the withstand voltage of the ground surface in the region where the outrigger float is placed cannot be detected by inserting the withstand voltage detection rod into the ground surface. Not only is it troublesome, but the insertion position of the pressure resistance detection rod may be displaced from the planned mounting position of the float, and the ground contact surface is a cobblestone road surface or the paving condition of the ground contact surface. May not be able to insert the pressure resistance detection rod into the ground plane, so
There is a risk that the detection of the breakdown voltage of the ground plane on which the mount is placed may be omitted. In addition, in order to lay a floor plate having a large pressure resistance on the entire area of the ground contact surface, it is troublesome because it requires time to prepare and spread the floor plate.

[0006] Further, on the lower surface of the outrigger float described in JP-B-51-46735, the flow is concerned.
In the case of an outrigger that has a grounding plate with a grounding area larger than the grounding area of the gutter detachably mounted, by mounting the grounding ground on the lower surface of the outrigger, the grounding pressure per unit grounding area is reduced. Although there is a range in which the grounding surface can be less than the original pressure resistance, it is troublesome to remove the grounding ground when it is not necessary.There is a limit to reducing the grounding pressure per unit grounding area by this grounding ground. Not only there, but by attaching a grounding plate to the outrigger's float or this float,
There is no idea of detecting the breakdown voltage of the ground contact surface in the cargo handling work state by the crane vehicle.

Further, in the above withstand voltage detecting method of inserting the withstand voltage detecting rod into the ground on which the outrigger float is placed, the inserting position of the withstand voltage detecting rod deviates from the grounding area of the float, There is a risk that the necessary detection area may be missed.In particular, for example, in the case of a cliff edge or a grounding area such as an embankment, due to the existence of non-uniform pressure resistance due to the non-uniformity of the soil, In many cases, it is necessary to confirm whether or not the pressure resistance can endure in the cargo handling operation state by the crane vehicle, and in any case, the operation is troublesome, and the detection method for them is somewhat reliable. I didn't like the lack of sex.

Even if the grounding pressure per unit grounding area is reduced by mounting the leveling ground on the outrigger float, is the grounding pressure after the reduction below the breakdown voltage of the grounding surface? No consideration has been given to detecting whether or not the ground contact pressure is higher than the ground contact pressure of the float in the cargo handling work state of the crane vehicle. Not done.

However, if a breakdown voltage detection method based on a nondestructive inspection method is adopted for the breakdown voltage of the ground plane (ground),
Even if the ground contact surface is a stone road surface or there are various buried objects in the ground (ground), the pressure resistance of all ground (ground) can be detected, but this nondestructive inspection method is not applicable. Since this method requires a fairly large-scale device, there is a problem that this method is practically unreasonable for application to the usual cargo handling work area by crane vehicles from the viewpoint of handling and economical efficiency. ..

The present invention has been made by paying attention to the problems in the prior art as described above, and a withstand voltage detection float of the ground surface of the float is provided around the outrigger float of the crane vehicle. It is installed so that it can appear and disappear, and the expansion and
Prior to the cargo handling work by the crane vehicle, in the cargo handling work state by the crane vehicle, a surface pressure substantially the same as the surface pressure generated on the outrigger float is applied to the expansion / contraction boom of the crane vehicle. In a no-load state where the load is not suspended from the boom head, the expansion / contraction boom is operated (simulated) in substantially the same manner as the actual cargo handling operation to generate the pressure resistance detection float, This breakdown voltage detection float directly detects the breakdown voltage of the ground area prior to the actual cargo handling work, and a method and apparatus for detecting the breakdown voltage of the ground surface by the outrigger float that can solve the problems in the conventional example described above. It is the one we are trying to provide.

[0011]

In order to solve the above-mentioned problems of the prior art, the present invention provides a float at the lower end of the vertical support leg at the end of the overhanging beam of the crane vehicle. , A pressure resistance detection float having a ground contact area smaller than the ground contact area is arranged, and the crane car is supported by the pressure resistance detection float prior to cargo handling work by the crane car. Or in the bearing state of the crane vehicle by the pressure resistance detection float, the telescopic boom is loaded with the load in an unloaded state before the crane vehicle is loaded onto the telescopic boom. By performing an operation similar to the operation in the suspended state, the presence or absence of the withstand voltage that will be generated on the ground surface due to the floating ground of the outrigger in the suspended state of the load on the telescopic boom is checked for the withstand voltage detection flow. Out detected in advance by Moth flow - a breakdown voltage detection method of the ground plane by preparative also crane - emission vehicle outrigger of the overhang bi - the vertical support leg lower portion of the arm end, the required contact area furo -
While the float is provided, the float is placed at the center of the float.
The withstand voltage detection float with a ground area smaller than the ground area of the
It is a device for detecting the withstand voltage of the ground surface by an outrigger float provided so as to be able to project and retract from the lower surface.

(Operation) Since the present invention has the above-mentioned configuration, the outrigger beer of the outrigger of the lane vehicle concerned.
On the lower surface of the float provided at the bottom of the vertical support leg at the end of the frame, the withstand voltage detection flow with a ground area smaller than the ground area of the float concerned.
Of the crane vehicle, and after supporting the crane vehicle in the cargo handling work area by the pressure resistance detection float, prior to the cargo handling operation by the crane vehicle, the expansion boom of the crane vehicle is mounted. When the load is not suspended and the telescopic boom is operated in substantially the same manner as the operation in the actual cargo handling operation state, the surface pressure of the pressure resistance detection float is changed to the crane pressure. In the actual cargo handling operation state of the vehicle, the surface pressure is almost the same as the surface pressure generated on the float, so that the withstand pressure of the ground contact surface is equal to that in the actual cargo handling work state by the crane vehicle. Whether or not to withstand the surface pressure generated on the outrigger float is directly detected in advance by the pressure resistance detection float.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method and an apparatus for detecting a withstand voltage of a ground plane by an outrigger float according to the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a schematic side view showing a main portion of a first embodiment of a method and apparatus for detecting a withstand voltage of a ground plane by a float of an outrigger according to the present invention, with a part thereof cut longitudinally. FIG.

In FIG. 1, reference numeral 1 denotes an outrigger provided laterally on a vehicle body base B of a crane vehicle (not shown), and 2 a lateral projection of the vehicle body base B (right side in FIG. 1). The overhanging beam 3 which can be provided is a vertical support leg provided at the end of the overhanging beam, 3a is a hydraulic cylinder for moving the vertical support leg 3 itself up and down, and 4 is a vertical support leg 3 (the lower part thereof in this embodiment). The other hydraulic cylinders 5 provided are ribs extending from around the hydraulic cylinder 4 downward, and 6 is a float provided at the lower end of the rib 5 and having a required ground contact area. It is formed in a disk shape having a diameter of D ₁ . Further, a hole 7 is provided at the center of the float 6, and the area (effective ground contact area) of the float 6 is the hole 7
It is configured to be sufficiently larger than the area of the part (for example, about 2 to 5 times). 10 is a piston provided in the hydraulic cylinder 4,
Reference numeral 11 is a piston rod extending from the piston 10, 12 is a pressure resistance detection float of the ground surface G provided at the lower end of the piston rod 11, and the diameter d ₁ of this pressure resistance detection float 12 is
The diameter of the hole 7 of the float 6 is approximately equal to that of the hole 7.

13 is a bracket provided at an appropriate position on the rib 5,
14 is a bracket 13 at one end and a pressure resistance detection flow at the other end.
The tension pressure springs 12 are fixed to the upper surface of the hood 12, and the tension pressure spring 12 is used by the tension spring 14.
Is always urged to pull upward. Reference numeral 16 is an oil passage for supplying / discharging pressure oil to / from the hydraulic cylinder 4, 17 is a hydraulic pressure source thereof, and 18
Is a hydraulic pressure gauge provided at an appropriate position of the oil passage 16. The outriggers 1 as described above are provided at four positions before and after a revolving structure (not shown) on the vehicle body base B of the crane vehicle so as to be able to project from the vehicle body base B to both sides. ..

(Operation of First Embodiment) First, a crane vehicle (not shown) equipped with this outrigger 1 is made to travel to a target cargo handling work area, and then the overhanging beam 2 of the outrigger 1 is moved. After extending the required length to the side of the vehicle base B,
First, the vertical support leg 3 is extended by the hydraulic cylinder 3a,
The lower surfaces of the float 6 and the pressure resistance detecting float 12 are brought into contact with the ground G at the same time to support the crane vehicle on the ground G. After that, the hydraulic cylinder 4 provided on the vertical support leg 3
Then, pressure oil is sent from the hydraulic pressure source 17 through the oil passage 16, and the crane vehicle is supported on the ground G only by the pressure resistance detection float 12. Incidentally, suppose this state, that is,
If the pressure resistance detection float 12 sinks into the ground G in a state before the operation of the cargo handling operation of expanding, contracting, undulating or turning the expansion / contraction boom, it is immediately understood that the pressure resistance of the ground G in the relevant area is not sufficient. ..

Thereafter, the turning of the revolving superstructure on the crane car, the undulation of the telescopic boom provided on the revolving superstructure and its expansion and contraction, etc. are not suspended on the telescopic boom. By operating in substantially the same manner as the operation in the loading and unloading work state of suspending a load to the telescopic boom in the unloaded state, at this time, the boom head of the telescopic boom is also accompanied by this operation. The crane block is not loaded on a hook block supported by a wire rope that hangs down from the crane block, and the crane car is swung and the telescopic boom is undulated and / or telescopically operated. By operating in the same manner as the operation in the cargo handling operation state, the float 6 and the pressure resistance float 12 in the pressure resistance detection float 12 in the actual cargo handling operation state of the crane vehicle. It is almost the same as the surface pressure generated in 12. A surface pressure is generated, and it is visually checked whether or not the withstand voltage detection float 12 sinks in the operating state of the telescopic boom, or it is detected by the limit switch 19, and the withstand voltage of the ground surface G in the relevant area is concerned. The float 6 of the outrigger 1 in the cargo handling operation state by the crane vehicle.
And whether to withstand the surface pressure generated in the pressure resistant float 12,
It is detected before the actual cargo handling work by the crane vehicle.

The pressure resistance detection float 12 has a diameter d.
Since forming the _first disc-shaped, the contact area is ^{_{a 1 = πd 1 2/4}} , which is flow forms a disk shape having a diameter D ₁ - contact area A ₁ bets 6 parts (In this case, Hole 7 with diameter of float 6 of d ₁
DOO 12 is disposed, flow - - Part withstand voltage detecting flow in Preparative 6 simultaneously with clay - will the supporting action of the emission vehicle) is sufficiently narrower than ^{_{A 1 = πD 1 2/4}} , for example, a ₁ / A ₁ = (1/2 to 1/5), and operate the expansion / contraction boom of this crane vehicle in the unloaded state in the same manner as the actual cargo handling operation state. As a result, the surface pressure per unit area of the pressure resistance detection float 12 is hung from the boom head of the telescopic boom to the hook block hung via the wire rope.
In the actual cargo handling operation state, the surface pressures generated on the float 6 and the pressure resistance detection float 12 substantially coincide with each other.

Therefore, if the pressure detection float 12 of the outrigger that supports the crane vehicle sinks to the ground surface G, it is immediately apparent that the ground pressure is insufficient. When the pressure resistance detecting float 12 sinks to the ground G, the lower end of the terminal of the limit switch 19 provided at the end of the float 6 comes into contact with the ground G. For example, the limit switch 19 is included. An alarm circuit (not shown) is turned on to generate a required alarm, and the operator of the crane vehicle is warned that the crane vehicle is tilting.

While the supply of the pressure oil from the hydraulic source 17 to the hydraulic cylinder 4 is stopped, the pressure oil in the hydraulic cylinder 4 is set to the discharge position. Accordingly, the tension spring 13 pulls up the pressure resistance detection float 12 into the hole 7, and the crane 6 is supported by the float 6 and the pressure resistance detection float 12 having a large ground contact area.

The pressure resistance detection flow 12 is used to clear the screen.
When the crane vehicle is supported, the crane vehicle is unloaded and operated in the same manner as the loading operation in the loaded state, that is, the swing of the revolving structure, the expansion and contraction of the expansion and contraction boom, and the simulation of the expansion and contraction. -The limit switch 1 is turned on when the pressure resistance detection float 12 is depressed into the ground G by
9, the circuit pressure of the pressure oil supply circuit to the hydraulic cylinder 4 is automatically released, so that the crane wheel can be supported by the float 6 having a large ground contact area and the pressure resistance detection float 12. Therefore, it is possible to prevent further depressions of the floats 6 and 12 and to avoid the risk of falling (not shown).

The float 6 of the outrigger 1 is
Square plate, rectangular plate, oval plate, etc.
It is also possible to form a shape other than a circular plate, and for the float 6 formed in any of those shapes, a hole having a size substantially smaller than that of each outer shape or substantially the same shape as each outer shape or A circular hole may be provided, and in these cases, the withstand voltage detection float 12 may be formed to have substantially the same shape and size as the hole provided in the central portion of each.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the side view of FIG. 2 schematically showing the essential parts thereof. In addition, the same names and reference numerals are used for the portions common to the first embodiment shown in FIG.

In FIG. 2, 3 is a vertical support leg provided at the end of the overhanging beam 2 of the outrigger 1, 26 is a floor plate-like float, and the grounding area of this floor plate-like float 26 is a normal floor. −
(The first embodiment shown in FIG. 1, the float 6) has the same ground contact area. The reference numeral 32 designates a withstand voltage detection float of a grounding surface provided at the lower part of the vertical support leg 3. The ground contact area a ₂ of this withstand voltage detection float 32 is the ground contact area A _{2 of the} floor board-like float 26.
It is sufficiently narrower (when both the pressure resistance detection float 32 and the floor plate-shaped float 26 are disk-shaped in plan view, for example, a
₂ / A ₂ ≈1 / 2 to 1/5).

(Operation of Second Embodiment) After the crane vehicle equipped with the outrigger 1 is run to the target cargo handling work area, the overhanging beam 2 of the outrigger 1 is mounted on the vehicle body.
After extending the required length to the side of the space B, the vertical support leg 3 at its end is extended downward, and the pressure resistance detection float 3 at the lower end thereof is extended.
2 is grounded on the ground G, and this crane car is on the same floor 3
Support by 2. It should be noted that, if the breakdown voltage detection float 32 is depressed in the ground G in this state, it can be understood that the breakdown voltage of the ground G in the region is not sufficient.

Thereafter, the revolving structure on the crane vehicle is revolved in an unloaded state in which the load is not suspended on the hook block.
The lower floor plate-shaped float 2 of the pressure resistance detection float 32 is operated by performing undulations of the expansion / contraction boom and its expansion / contraction.
Spread 6, the clay - when loading operation in emission car load condition, floor plate-shaped flow - contact area A ₂ and the breakdown voltage detection flow DOO 26 - the area ratio of the ground area a ₂ of preparative 32 a ₂ / A ₂ is a ground plate pressure generated on the outrigger withstand voltage detection float 32 by the operation of the expansion / contraction boom in the no-load state by the crane, and a floor plate shape laid below the withstand voltage detection float 32. The ground contact area ratio of the two is set so that the crane 26 is supported on the float 26 and the surface pressure generated when the crane is loaded and operated under load is approximately equal. Before carrying out actual cargo handling operation with this crane,
Ground the pressure resistance detection float 32 to the ground G,
By operating the telescopic boom of the car with no load,
In the actual cargo handling operation state, the floor plate 26
In addition to the surface pressure that will be generated in the
Whether or not it can withstand is surely detected.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. In addition, the same names and reference numerals are used for the portions common to the first embodiment shown in FIG.

In FIG. 3, 3 is a vertical support leg provided at the end of the overhanging beam 2 of the outrigger 1, 46 is a bottom end of the vertical support leg 3 and has a normal ground area, 52
Is the withstand voltage detection flow of the ground plane G.
The ground contact area a ₃ of the float 46 is sufficiently smaller than the ground contact area A _{3 of the} float 46 (the breakdown voltage detection float 46 and the breakdown voltage float 52.
When both and are circular in plan view, for example, a ₃ / A ₃ ≈ =
(About 1/2 to 1/4).

(Operation of the third embodiment) A crane vehicle equipped with this outrigger is caused to travel to a desired cargo handling work area, and its overhanging beam 2 is moved to the side of the vehicle body base B by a required length. After overhanging, the flow of the lower part of the vertical support leg 3 at its end
A breakdown voltage detection float 52 is vertically arranged below the central portion of the boot 46. Then, extend the vertical support leg 3 downward,
The crane vehicle is supported on the ground G by the pressure resistance detection float 52. It should be noted that if the breakdown voltage detection float 52 is depressed in the ground G in this state, it can be understood that the breakdown voltage of the ground G in the region is not sufficient.

After that, by turning the revolving superstructure on the crane car, raising and lowering the expandable telescopic boom provided on the revolving superstructure, and its expansion and contraction, that is, without suspending a load on the hook block. By swinging the revolving structure and undulating and extending the telescopic boom (in the unloaded state), the weight of the crane vehicle in the unloaded operating state is applied to the pressure resistance detecting float 52, and furo - ground area a ₃ and the breakdown voltage detection flow DOO 46 - the area ratio of the ground area a ₃ DOO 52 (a ₃ / a ₃₎ is the clay - stretching in a no-load state by emission Bed - zooming operation of As a result, the ratio of the ground pressure generated in the outrigger pressure detection float 52 to the surface pressure generated in the float 46 of each outrigger due to the operation of the expansion / contraction boom in the loaded state by the crane is approximately. In fact, because they are configured equally Prior to the cargo handling operation described above, whether or not the breakdown voltage of the grounding surface G is sufficient is immediately detected by operating the expansion / contraction boom in the unloaded state.

(Effects of the Invention) (1) Before the actual cargo handling work by the crane vehicle is started,
The crane car is supported by the outrigger pressure resistance detection float on the ground of the cargo handling work area, and the telescopic boom is operated in the same manner as the cargo handling operation state, whereby the pressure resistance of the ground contact surface is increased. Can directly detect whether or not it can withstand the surface pressure of the float in the cargo handling work state of the crane vehicle,
If there is a region with uneven pressure resistance of the ground in the region in which the crane vehicle is installed, the insufficient pressure resistance region can be immediately detected, and the unevenness during actual cargo handling work by the crane vehicle can be detected. It is possible to prevent a ready inclination or fall.

(2) Flow of outrigger for crane vehicle
A pressure resistance detection float with a grounding area sufficiently smaller than the grounding area of the float is installed below the float to support the crane vehicle and the telescopic boom of the crane without load. Whether the pressure resistance of the ground surface of the work area by the crane vehicle can withstand the surface pressure generated on the float in the loaded state of the crane vehicle by operating in the same manner as in the load state. Can be detected immediately.

If a limit switch with a terminal, the lower end of which projects downward from the bottom of the float, is provided on the outside of the outrigger float, and an alarm circuit that operates when the limit switch is turned on is provided, the contact switch is connected. When the pressure resistance of the ground surface is detected by the pressure resistance detection float on the ground, if the pressure resistance of the contact surface becomes insufficient, the insufficient condition is automatically warned immediately, and the inclination is blocked before the crane vehicle tilts greatly. Measures can be taken.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a first embodiment of the present invention with a part thereof cut away. FIG. 2 is a side view of the essential parts of the second embodiment of the present invention. FIG. 3 is a side view of the essential parts of the third embodiment of the present invention.

[Name of code] 1 ... Outrigger 2 ... Overhanging beam 3 ... Vertical support leg 4 ... Hydraulic cylinder 6,46 ... Float 7 ... Hole 10 ... Piston 12, 32, 52 ... Withstand pressure detection furo - DOO 14 ...... tensioning spring 26 ...... decking shaped flow - DOO _{a 1, a 2, a 3} ...... furo - ground area bets _{a 1, a 2, a 3} ...... breakdown voltage detected flow - bets Ground area

Claims (2)

[Claims] 1. A float is provided at a lower portion of a vertical support leg at an end of an overhanging beam of an outrigger of a crane vehicle, and a withstand voltage detection float having a ground contact area smaller than the ground contact area is provided on the float. However, prior to the cargo handling work by the crane vehicle, by supporting the crane vehicle by the pressure resistance detection float, or in the bearing state of the crane vehicle by the pressure resistance detection float, In a no-load state before suspending a load on the telescopic boom of the crane vehicle, the telescopic boom is operated in a similar manner to the operation in the suspended state to load the telescopic boom. The presence / absence of a withstand voltage generated on the ground surface due to the grounding of the outrigger in the suspended state is detected in advance by the withstand voltage detection float, and the withstand voltage of the ground surface is detected by the outrigger float. Method. 2. A float having a required ground contact area is provided at a lower portion of a vertical support leg at an end of an overhanging beam of an outrigger of a crane vehicle, while a float having a required ground contact area is provided at a central portion of the float. A breakdown voltage detection device for a ground surface by an outrigger float, wherein a breakdown voltage detection float having a ground area smaller than the ground area is provided so as to be able to project and retract from the lower surface.