JP4856812B2 - Control device for work equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety device for a working machine.
[0002]
[Prior art]
Examples of this type of work machine include a crane truck and an aerial work vehicle. As shown in FIG. 3, the aerial work vehicle A has a swivel base 2 disposed on a vehicle 1 so as to be capable of being swiveled, and a first boom 3 is disposed on the swivel base 2 so as to be freely extended and retracted. That is, the first boom 3 has a plurality of intermediate booms 3b, 3c, 3d and a tip boom 3e sequentially inserted into the base boom 3a so as to be telescopically extendable, and telescopic drive means such as a telescopic hydraulic cylinder (illustrated) between the booms. (Not) is arranged appropriately so that the middle boom 3b, 3c, 3d and the tip boom 3e can be extended and retracted sequentially from the base boom 3a. Further, a hydraulic cylinder 4 for raising and lowering is disposed between appropriate positions between the base boom 3a and the swivel base 2 so that the first boom 3 can be driven for raising and lowering.
[0003]
A bracket 5 is detachably attached to the tip of the first boom 3, and a base 6 is swingably attached to the bracket 5. A support 6a is disposed on the base 6, and a posture maintaining device (shown in the figure) is provided between the bracket 5 and the base 6 so that the support 6a can always maintain a vertical posture regardless of the up-and-down driving of the first boom 3. Do not arrange).
[0004]
An upper swivel 12 is disposed on the column 6a so as to be capable of swiveling, and a second boom 13 is disposed on the upper swivel 12 so as to be able to extend and retract. That is, the second boom 13 has a plurality of intermediate booms 13b and 13c and a tip boom 13d sequentially inserted into the base boom 13a so as to be telescopically extendable, and telescopic drive means such as a telescopic hydraulic cylinder (not shown) between the booms. appropriately placed, are sequentially intermediate boom 13b from the base boom 13a, and 13c and boom top 13 e to be telescopic drive. Further, a hoisting hydraulic cylinder 14 is arranged between appropriate positions between the base boom 13a and the upper swivel 12 so that the second boom 13 can be driven to hoist.
[0005]
A vertical posture maintaining device (not shown) is attached to the tip of the second boom 13 so as to maintain the vertical posture regardless of the up-and-down driving of the first boom 3 and the second boom 13 when the work table 15 is attached.
[0006]
Such an aerial work vehicle A is operated by an operator who has mounted the work table 15 by moving the first boom 3 and the second boom 13 so that the work table 15 is positioned at a desired high position. Work at height.
[0007]
[Problems to be solved by the invention]
By the way, since the aerial work vehicle A has the second boom 13 attached to the tip of the first boom 3, when the first boom 3 is driven to extend, undulate, or turn, the second boom 13 is accompanied by inertia. Since it is affected by force, it is necessary to increase the strength of the second boom 13. That is, the inertia force received at the platform 15, scale the second boom 13, undulations, than when generated by driving the turning is greater when expansion and contraction of the first boom 3, undulations, generated by the rotation driving Therefore, it is necessary to increase the strength of the second boom 13 in consideration of this. In particular, as the second boom 13 is extended, the influence of the inertial force is significantly increased. Therefore, if the strength of the second boom 13 is increased, the weight is increased correspondingly, the working range as an aerial work vehicle is narrowed, and the cost is increased. It is an object of the present invention to provide a working machine safety device that solves such problems.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a safety device for a working machine according to claim 1 of the present invention is configured such that a first boom is disposed on a vehicle so that the first boom can be extended and retracted, and a second boom is disposed at a tip of the first boom. A safety device for a working machine arranged to be freely extended and retracted, wherein the second boom length detector detects the length of the second boom, and the undulation regulating means regulates the undulation driving of the first boom, A controller is provided that receives a signal from the detector and outputs a signal to the undulation regulating means when the length of the second boom exceeds a predetermined value.
[0009]
In the safety device for a work machine according to a second aspect of the present invention, the first boom is disposed on the vehicle so as to be able to extend and retract, and the second boom is disposed at the front end of the first boom so as to be able to extend and retract. A safety device for a work machine, the second boom length detector for detecting the length of the second boom, expansion / contraction restriction means for restricting the expansion / contraction drive of the first boom, and a signal received from the detector. A controller is provided that outputs a signal to the expansion / contraction restriction means when the length of the two booms exceeds a predetermined value.
[0010]
According to a third aspect of the safety device for a work machine of the present invention, a first boom is disposed on a vehicle so that it can be extended , retracted , and swiveled, and a second boom can be extended, retracted, and driven at a front end of the first boom. A safety device for a work implement arranged, a second boom length detector for detecting the length of the second boom, a turning restricting means for restricting the turning drive of the first boom, and a signal from the detector. A controller is provided that outputs a signal to the turning restricting means when the length of the receiving second boom exceeds a predetermined value.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a safety device B for a working machine according to the present invention will be described with reference to FIGS. 1 and 2, taking the aerial work vehicle described in the related art as an example. In FIG. 1, 20 is a second boom length detector for detecting the length of the second boom 13, and the tip of the cord fed from the cord winder disposed on the base boom 13a is set to the front boom 13e. The extension length of the second boom 13 is detected by detecting the rotation of the cord winder with a potentiometer or the like.
[0012]
Reference numeral 21 denotes a first boom expansion / contraction electromagnetic proportional control valve that outputs a control signal based on the operation of the expansion / contraction operation lever and controls the expansion / contraction drive means of the first boom 3. It also serves as an expansion / contraction restriction means for restricting the expansion / contraction drive of the first boom 3 by blocking the signal output to the control valve 21.
[0013]
Reference numeral 22 denotes a first boom raising / lowering electromagnetic proportional control valve which outputs a control signal based on the operation of the raising / lowering operation lever and controls the raising / lowering driving means of the first boom 3. It also serves as a undulation regulating means for regulating the undulation driving of the first boom 3 by blocking the signal output to the control valve 22.
[0014]
Reference numeral 23 denotes a first boom turning electromagnetic proportional control valve which outputs a control signal based on the operation of the turning operation lever and drives and controls the turning drive means of the first boom 3, and this first boom turning electromagnetic proportional control valve. It also serves as a turning restricting means for restricting the turning drive of the first boom 3 by cutting off the signal output to the control valve 23.
[0015]
24 stores in advance a detection signal value detected from the second boom length detector 20 when the second boom 13 reaches a predetermined length, and a detection signal from the second boom length detector 20 is stored. When the detected signal reaches the stored value, it is output to the first boom telescopic electromagnetic proportional control valve 21, the first boom raising / lowering electromagnetic proportional control valve 22, and the first boom turning electromagnetic proportional control valve 23. It is a controller that functions to cut off the signal. Here, the value stored in the controller 24 is the second boom length (predetermined length) when the second boom 13 can sufficiently withstand the inertial force received when the first boom 3 is extended, retracted, or turned. )).
[0016]
The safety device B for a work machine according to the present invention configured as described above operates as follows. When the second boom 13 is extended by a predetermined length or more to drive / control the first boom 3 to extend / retract, undulate, or turn, the detection signal detected from the second boom length detector 20 is sent to the controller 24. Therefore, the controller 24 outputs to the first boom telescopic electromagnetic proportional control valve 21, the first boom raising / lowering electromagnetic proportional control valve 22, and the first boom turning electromagnetic proportional control valve 23. Block the signal being transmitted. Therefore, in this state, the first boom 3 cannot be driven and controlled to extend, retract, or turn. When the first boom 3 is driven to extend, undulate, or turn, the second boom 13 is reduced to a predetermined length or less, and then the first boom 3 is driven to extend, undulate, or turn. Can be canceled.
[0017]
As described above, when the second boom 13 is longer than the predetermined length, the first boom 3 cannot be driven and controlled. Therefore, the second boom 13 does not need to have sufficient strength, and the weight is accordingly increased. Can be reduced, and the working range as an aerial work vehicle can be widened, and the cost can be reduced.
[0018]
In the embodiment described above, each of the restricting means such as the expansion / contraction, undulation and turning restriction means (the first boom expansion / contraction electromagnetic proportional control valve 21, the first boom raising / lowering electromagnetic proportional control valve 22, and the first boom turning electromagnetic proportional control). Although the valve 23) is provided, it is possible to omit the expansion / contraction and swivel regulation means and provide only the undulation regulation means. Further, the turning restriction means may be omitted, and the expansion / contraction and undulation restriction means may be provided. Further, the expansion / contraction restriction means may be omitted, and undulation / turning restriction means may be provided. In the above-described embodiment, the first boom expansion / contraction electromagnetic proportional control valve 21, the first boom raising / lowering electromagnetic proportional control valve 22, and the first boom turning electromagnetic proportional control valve 23 are each extended / retracted, raised / lowered, and turning regulating means. However, an unloading valve is disposed in front of the first boom 3 expansion / contraction, undulation, and turning drive means, and the controller 24 includes the first boom expansion / contraction electromagnetic proportional control valve 21 and the first boom undulation electromagnetic proportional control valve 22. Regulating means so as to output a signal to the unloading valve without interrupting the signal outputted to the first boom turning electromagnetic proportional control valve 23 and to return the hydraulic pressure to the expansion / contraction, undulation and turning driving means to the tank. May be configured.
[0019]
Further, in the above embodiment, the controller 24 regulates each driving means of the first boom 3 when the second boom 13 is longer than the predetermined length, but the predetermined length of the second boom 13 is set to the second boom 13. It may be set at the time of full reduction.
[0020]
Next, in the safety device B of the above-described embodiment, the length of the second boom 13 is detected, and the controller 24 directly determines that the second boom 13 has reached a predetermined length or longer. However, the second boom undulation angle detector 25 is arranged as shown in FIG. 2, and the undulation angle signal of the second boom 13 detected from the second boom undulation angle detector 25 and the second (2) A safety device C in which a controller 24A is arranged so as to regulate each driving means of the first boom 3 when a working radius is obtained from a boom length signal from the boom length detector 20 and the working radius exceeds a predetermined value. It may be as follows. That is, it may be based on indirect determination in which the length of the second boom 13 is equal to or greater than a predetermined value by a method using a work radius calculation.
[0021]
Further, a second boom turning angle detector 26 for detecting the turning angle of the second boom 13 is arranged so that each drive control means of the first boom 3 is restricted unless the second boom 13 is within a predetermined state region. It may be. The predetermined state area may be set to a state in which the second boom 13 is stored. That is, the time when the telescopic boom 13 is fully reduced, laid down, and turned in the direction along the undulation locus surface of the first boom 3 is set.
[0022]
In the above embodiment, each drive means of the first boom 3 is regulated by the length of the second boom 13, but a first boom length detector that detects the length of the first boom 3 is arranged. Then, a controller that regulates each driving means of the first boom 3 when the total boom length of the second boom 13 and the first boom 3 becomes a predetermined length or more may be arranged.
[0023]
As a further development example, the operating means of the aerial work platform A is configured to be operable from two places on the work table 15 and the swivel base 2, and when operating from the swivel base 2, the second boom 13 has a predetermined length. Two settings may be stored and selected for use when the position is set as described above and when a position where the length of the second boom 13 is longer than that set as described above is stored. That is, when the operator is not on the work table 15, there is no fear that the operator will be shaken off from the work table 15 even if the peripheral speed of the work table 15 is somewhat high. Therefore, the second boom 13 is long. The case where the position is set is selected and each driving means of the first boom 3 is driven. In this case, the first boom 3 can be driven without reducing the second boom 13 to the predetermined length.
[0024]
Although the description in the above embodiment has been described by taking the case of application to an aerial work vehicle as an example, it is needless to say that it can be applied not only to an aerial work vehicle but also to a work machine such as a crane vehicle.
[0025]
【Effect of the invention】
Since the working device safety device according to claims 1 to 3 of the present invention operates and is configured as described above, the second boom need not have sufficient strength, and the weight can be reduced accordingly. The work range as a work machine can be widened, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view illustrating an embodiment of a safety device for a working machine according to the present invention.
FIG. 2 is an explanatory diagram for explaining an embodiment of a safety device for a working machine according to the present invention and an explanatory diagram for explaining another embodiment.
FIG. 3 is an explanatory diagram for explaining an aerial work vehicle as a work machine.
[Explanation of symbols]
3 1st boom 13 2nd boom 20 2nd boom length detector 21 1st boom expansion / contraction electromagnetic proportional control valve (regulating means)
22 Proportional electromagnetic control valve for first boom hoisting (regulating means)
23 Electromagnetic proportional control valve for first boom rotation (regulating means)
24 Controller 24A Controller B Safety device C Safety device

Claims (3)

 A safety device for a working machine in which a first boom is disposed on a vehicle so that the first boom can be extended and retracted, and a second boom is disposed at a distal end of the first boom so as to be able to extend and retract. A second boom length detector for detecting the undulation, a undulation regulating means for regulating the undulation driving of the first boom, and the undulation regulation when the length of the second boom exceeds a predetermined value in response to a signal from the detector. A work machine safety device comprising a controller for outputting a signal to the means.  A safety device for a working machine in which a first boom is disposed on a vehicle so that the first boom can be extended and retracted, and a second boom is disposed at a distal end of the first boom so as to be able to extend and retract. A second boom length detector for detecting the movement of the first boom, an expansion / contraction restriction means for restricting the expansion / contraction drive of the first boom, and the expansion / contraction restriction when the length of the second boom exceeds a predetermined value in response to a signal from the detector. A work machine safety device comprising a controller for outputting a signal to the means. A safety device for a working machine in which a first boom is disposed on a vehicle so that the first boom can be extended , retracted and swiveled, and a second boom is disposed on a front end of the first boom so as to be able to extend and retract. A second boom length detector for detecting the length, a turning restricting means for restricting the turning drive of the first boom, and a signal from the detector when the length of the second boom exceeds a predetermined value; A working machine safety device comprising a controller that outputs a signal to a turning restriction means.

Images