JP2004352489A - Boom storage detection device for boom working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boom storage detection device for a boom working vehicle capable of securely detecting whether a boom is at predetermined storage attitude or not in spite of an inexpensive configuration. <P>SOLUTION: This boom storage detection device is composed of a projection 32a provided on a boom member (an intermediate boom 32) moving relative to a traveling body 10 when the boom 30 expands and contracts among a plurality of boom members (a terminal boom 31, the intermediate boom 32, and a tip boom 33) constituting the boom 30 and a boom storage detection sensor (limit switch) 64 provided on the traveling body 10 and coming into contact with the projection 32a while the boom 30 is at the predetermined storage attitude to output a storage detection signal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom storage detection device for a boom working vehicle that detects a stored posture of a boom in a boom working vehicle provided with a telescopically movable boom so as to be able to move up and down on a traveling body.
[0002]
[Prior art]
The boom provided on aerial work vehicles and crane trucks is generally configured to be telescopic, and a working machine (aerial work vehicle) provided at the tip of the boom is provided with a mechanism for raising and lowering and turning the boom. If there is, a work table, or a crane, a suspension device) can be moved to a predetermined height. In a boom working vehicle equipped with such a boom, the boom needs to be in a storage position when traveling on a road, and a boom storage detection device for detecting and confirming whether the boom is in the storage position. It has.
[0003]
The storage of the boom is performed by turning the boom to a predetermined turning angle after the boom is fully contracted, and then lowering the boom to a predetermined undulating angle. For this reason, the conventional detection of the boom storage is performed by providing a limit switch on a boom receiver that is provided on the traveling body and supports the lower surface of the boom when the boom is in the storage position, and the limit switch is provided when the boom is mounted. Is turned on (for example, see the following Patent Document). In addition to this, there is also known one that detects the fully contracted state of the boom using a limit switch or the like provided on the boom.
[0004]
[Patent Document 1]
Utility model registration No. 2510310 [0005]
[Problems to be solved by the invention]
However, in the former configuration of the conventional boom storage detection device, it is only possible to detect that the boom turning posture and the up-and-down posture are in a predetermined posture (posture corresponding to the stowed state), and the boom is completely retracted. There is a problem that it is not possible to detect whether or not it is in a contracted state. In the latter configuration, in addition to the boom turning posture and the up-and-down posture, it is also possible to detect whether the boom is in the fully contracted state, but this requires two detectors. Therefore, there is a problem that the manufacturing cost increases.
[0006]
The present invention has been made in view of such a problem, and has an inexpensive configuration, and a boom working vehicle having a configuration capable of reliably detecting whether or not a boom is in a predetermined storage position. It is an object to provide a boom storage detection device.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, the boom storage detection device for a boom working vehicle according to the present invention includes a plurality of boom members (for example, the base boom 31, the intermediate boom 32, and the distal boom 33 in the embodiment) which are telescopic. A boom working vehicle (e.g., the aerial work vehicle 1 in the embodiment) having a boom that is configured and that can freely expand and contract on a traveling body is provided, and a state where the boom is in a predetermined retracted posture is provided. A boom storage detection device for a boom working vehicle for detecting, which is provided on a boom member (for example, an intermediate boom 32 in the embodiment) that moves relative to a traveling body when the boom expands and contracts among the plurality of boom members. One storage detecting means (provided on the traveling body, which is provided on the traveling body, and which contacts the protrusion in a state where the boom is in the retracted posture to detect the up-down storage position and the telescopic storage position of the boom ( Eg to consists boom storage detection sensor 64) in the embodiment.
[0008]
In the boom storage detection device having such a configuration, the storage detection means does not contact the projection unless the boom has an up-and-down and expansion / contraction (in many cases, full contraction) posture corresponding to a predetermined storage posture, and the boom is in the storage posture. The storage detection means outputs a storage detection signal only when the predetermined undulation and expansion / contraction postures corresponding to the above are obtained. Therefore, in the present boom storage detection device, it is possible to simultaneously detect that the boom has reached the predetermined up-and-down storage position and the telescopic storage position by one detecting means. Can be detected. In addition, if the boom is provided so as to be pivotable on the traveling body, the storage detecting means detects the storage position of the boom as well as the storage position of the boom and the retractable storage position of the boom. In the present invention, the storage detecting means may comprise a limit switch that outputs a storage detection signal (for example, an off signal in the embodiment) when the switch piece is pressed by the protrusion when the boom is in the storage position. preferable.
[0009]
Further, in the boom storage detection device for a boom working vehicle according to the present invention, the boom working vehicle controls an outrigger jack provided on the traveling body and extending downward to stably support the traveling body, and extending and storing the outrigger jack. In the case where a control means (for example, the jack controller 50 in the embodiment) is provided, the control means performs the storage operation of the outrigger jack when the storage detection means detects that the boom is not in the storage position. Preferably, it is forbidden. With such a configuration, a so-called jack interlock mechanism that inhibits the storage operation of the outrigger jack when the boom is not in the predetermined storage position can be configured at low cost.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows an aerial work vehicle 1 provided with a boom storage detection device for a boom work vehicle according to an embodiment of the present invention. The aerial work vehicle 1 has traveling wheels (tire wheels) 11, 11,..., And can be operated from a driver's seat 12 in a truck-type traveling body 10, and a swivel provided on the traveling body 10. 20, a boom (telescopic boom) 30 having a base end supported via a foot pin 22 on an upper part of a column 21 provided to extend upward from the swivel table 20, and attached to a distal end of the boom 30. And a worktable 40 for boarding an operator.
[0011]
The swivel 20 is attached to the rear part of the traveling body 10 so as to be rotatable 360 degrees around the vertical axis. A turning motor (hydraulic motor) 23 is provided inside the traveling body 10. By rotating the turning motor 23, the turning table 20 can be horizontally turned via a gear (not shown). The boom 30 includes a base end boom 31, an intermediate boom 32, and a distal end boom 33 which are nested. The booms 31, 32, and 33 are relatively moved by a telescopic cylinder (hydraulic cylinder) 34 provided therein. To move the entire boom 30 in the axial direction (the intermediate boom 32 and the tip boom 33 move in conjunction with each other via a wire mechanism (not shown)). Further, an up-and-down cylinder (hydraulic cylinder) 24 is provided between the base end boom 31 and the column 21 of the swivel base 20, and the entire boom 30 is moved up and down within the upper and lower surfaces by operating the up-and-down cylinder 24. It can be raised and lowered.
[0012]
A boom tip fitting 35 is attached to the tip of the tip boom 33, and a lower end of an inverted L-shaped worktable support member 37 is attached to the boom tip fitting 35 via a swing pin 36. . A floor member 41 of a work table 40 is attached to the upper part of the work table support member 37, and the leveling cylinder (hydraulic cylinder) 38 is operated to expand and contract to swing the work table support member 37 around the swing pin 36. Thus, the floor member of the worktable 40 can be always kept in a horizontal posture regardless of the up-and-down angle of the boom 30.
[0013]
The floor member 41 of the work table 40 is attached to the work table support member 37 so as to be rotatable around a vertical axis. A swing motor (hydraulic motor) 43 is provided inside the workbench support member 37, and the whole workbench 40 is horizontally rotated with respect to the workbench support member 37 by rotating the swing motor 43. Can be operated. Further, a lattice-like handrail 42 is provided on the upper surface side of the floor member 41 of the work table 40, so that a worker boarding the work table 40 can be secured.
[0014]
In an operation box 44 provided on the work table 40, a lever device (not shown) for performing up / down, expansion / contraction, and turning operations of the boom 30 is provided. By operating this lever device, the operator who has boarded the worktable 40 can perform the raising / lowering operation of the boom 30, the expansion / contraction operation, the turning operation of the swivel base 20, and the horizontal turning operation of the worktable 40. For this reason, the worker who boarded the worktable 40 can move the worktable 40 on which he / she is riding as desired to perform work at an arbitrary high position.
[0015]
Outrigger jacks 13 are provided at four front, rear, left and right sides of the traveling body 10 to project downward and lift and support the traveling body 10, so that the work is performed in a state where the traveling body 10 is stabilized against overturning. You can do it. As shown in FIG. 3, the outrigger jack 13 is fixed to the traveling body 10 and is provided to extend downward, and a piston rod portion provided to be vertically movable relative to the cylinder tube portion 15. And a grounding plate 17 slidably attached to the lower end of the piston rod portion 16. An upper oil chamber S1 and a lower oil chamber S2 formed in the cylinder tube portion 15 are connected to an electromagnetic control valve 51 via oil paths L1 and L2, respectively, and hydraulic oil from a hydraulic pump P driven by an engine E is provided. Is supplied to the upper oil chamber S1 or the lower oil chamber S2 according to the position of a spool (not shown) of the electromagnetic control valve 51.
[0016]
As shown in FIG. 4, an electromagnetic control valve 51 corresponding to each jack cylinder 14 is connected to a jack controller 50 provided on the traveling body 10, and the jack controller 50 is connected to a jack extension provided on the traveling body 10. When the extension (extension) operation or the contraction (retraction) operation of the jack cylinder 14 is performed by the output operation switch 52 or the jack storage operation switch 53, the electromagnetic control valve 51 is controlled based on the jack operation signal output in response thereto. The spool is electromagnetically driven. Specifically, when an extension (extension) operation input of the jack cylinder 14 is performed by the jack extension operation switch 52, the jack controller 50 moves the spool of the electromagnetic control valve 51 to the right position PS1 in FIG. When a contraction (retraction) operation input of the jack cylinder 14 is performed by the jack storage operation switch 53, the jack controller 50 moves the spool of the electromagnetic control valve 51 to the left position PS2 in FIG.
[0017]
Here, when the spool of the electromagnetic control valve 51 is located at the right position PS1 in FIG. 3, the pressure oil from the hydraulic pump P is supplied to the upper oil chamber S1 of the cylinder tube portion 15 via the oil passage L1, and Since the hydraulic oil in the lower oil chamber S2 is discharged to the oil tank T via the oil passage L2, the piston rod portion 16 moves downward (the extension operation of the jack cylinder 14). When the spool of the electromagnetic control valve 51 is located at the left position PS2 in FIG. 3, the pressure oil from the hydraulic pump P is supplied to the lower oil chamber S2 of the cylinder tube portion 16 via the oil passage L2, Since the hydraulic oil in the oil chamber S1 is discharged to the oil tank T via the oil passage L1, the piston rod portion 16 moves upward (the contracting operation of the jack cylinder 14). Since the electromagnetic control valve 51 is of a closed center type and a double pilot check valve CV is interposed in the middle of the oil passages L1 and L2, the spool of the electromagnetic control valve 51 is located at the neutral position PS0. Occasionally, the jack cylinder 14 retains its current length.
[0018]
FIG. 4 shows the power transmission relationship between the hydraulic pump P and each jack cylinder 14 performed through the jack controller 50 and the electromagnetic control valve 51. However, in FIG. 4, of the four jack cylinders 14 provided on the traveling body 10, the reference numeral 14 a is provided for the front left side of the traveling body 10, and the reference numeral is provided for the front right side of the traveling body 10. 14b, reference numeral 14c is provided on the rear left side of the traveling body 10, and reference numeral 14d is provided on the rear right side of the traveling body 10. Also, of the four electromagnetic control valves 51, the reference numeral 51a corresponds to the jack cylinder 14a, the reference numeral 51b corresponds to the jack cylinder 14b, the reference numeral 51c corresponds to the jack cylinder 14c, and the reference numeral 51c corresponds to the jack cylinder 14d. The reference numeral is denoted as 51d.
[0019]
When the aerial work vehicle 1 moves to the work site (travels on the road), the boom 30 is fully retracted and the storage position is lowered to a predetermined angle from a state in which the tip is directed forward of the traveling body 10. Need to be. At this time, the work table 40 is turned horizontally so as to fit within the width of the traveling body 10. A boom receiver 60 is provided on the traveling body 10 so as to extend upward, and a distal end portion of the boom 30 at the time of storage is placed (see the boom 30 shown by a solid line in FIG. 2).
[0020]
As shown in FIG. 1, a boom receiver 61 is provided on the boom receiver 60, and the lower surface of the distal end portion of the base boom 31 in the stored state of the boom 30 is mounted thereon. . Further, the boom receiver 60 is provided with a lever member 62 and a boom storage detection sensor 64 which is pressed or released by the lever member 62 and outputs an on / off signal. One end of the lever member 62 is supported by the boom receiver 60 so as to be movable in the vertical direction, and an intermediate portion thereof is constantly urged upward by a compression spring 63 installed inside the boom receiver 60. On the other end side, there are provided a convex portion 62a bent so as to have a convex shape upward, and an extending portion 62b provided to extend below an end of the convex portion 62a.
[0021]
The boom storage detection sensor 64 is composed of a limit switch, and outputs an OFF signal when the switch piece 64a is in the initial position where the switch piece 64a is not pushed (the state corresponding to FIG. 1A), and the switch piece 64a is moved from the initial position. When it is in the pushed position (the state corresponding to FIG. 1B) pushed rightward in FIG. 1, it outputs an ON signal. The switch piece 64a is constantly urged leftward in FIG. 1 by a spring (not shown) built in the boom storage detection sensor 64 and is always in contact with the extending portion 62b of the lever member 62. The extension portion 62b that moves in response to this position is located at the initial position or the pushing position. Here, the state in which the ON signal is output from the boom storage detection sensor 64 is a state in which a voltage signal having a predetermined voltage value is output from the boom storage detection sensor 64, and the OFF state from the boom storage detection sensor 64. The state in which the signal is output means a state in which the boom storage detection sensor 64 does not output the voltage signal having the predetermined voltage value.
[0022]
As shown in FIG. 1, a projection 32a is provided on the lower surface side of the distal end portion of the intermediate boom 32 so as to protrude downward, and when the boom 30 is fully contracted, the base end boom 31 can receive the boom. When the boom 30 is mounted on the boom mounting portion 61 (that is, when the boom 30 is in the retracted position), the projection 32a contacts the convex portion 62a of the lever member 62 from above and moves it downward. When pressed, the entire lever member 62 is pushed down against the urging force of the compression spring 63. As described above, when the boom 30 is extended and retracted, the intermediate boom 32 and the distal boom 33 constituting the boom 30 move in the extending and retracting direction in conjunction with each other. In the posture, the tip boom 33 is always fully retracted with respect to the intermediate boom 32, and the projection 32a provided on the intermediate boom 32 presses the convex portion 62a of the lever member 62 downward. In a state where the boom 30 can be moved, the entire boom 30 is in a fully contracted posture.
[0023]
Here, in a state where the boom 30 in the fully contracted posture is mounted on the boom mounting portion 61 and the projection 32a provided on the intermediate boom 32 pushes down the entire lever member 62, the switch of the boom storage detection sensor 64 is switched on. The piece 64a is in contact with the extending portion 62b of the lever member 62 but is not pushed rightward in FIG. 1, and is at the initial position to output an off signal (FIG. 1A). reference). On the other hand, when the boom 30 is raised or turned from the storage position and the base end boom 31 is separated from the boom mounting portion 61 of the boom receiver 60, or when the protrusion 32a provided on the intermediate boom 32 is extended from the storage position. When the lever member 62 is separated from the convex portion 62 a, the lever member 62 is released from the downward pressing force and is moved upward by the urging force of the compression spring 63. In such a state, the switch piece 64a of the boom storage detection sensor 64 is pushed rightward by the extension portion 62b of the lever member 62 to be in the pushed position, and outputs an ON signal (see FIG. 1B). .
[0024]
The on / off signal output from the boom storage detection sensor 64 is input to the jack controller 50 as shown in FIG. When the output from the boom storage detection sensor 64 is an OFF signal (in the case shown in FIG. 1A), the jack controller 50 turns on the boom storage status display lamp 54, so that the worker can now It can be recognized that the boom 30 is in the stored state.
[0025]
When the output from the boom storage detection sensor 64 is an ON signal (as shown in FIG. 1B), the jack controller 50 controls each electromagnetic control valve 51 even when the jack storage operation switch 53 is operated. Is controlled not to be positioned at the left position PS2 in FIG. That is, it functions as a so-called jack interlock mechanism. Thereby, when the boom 30 is not in the storage state, an error in which the jack cylinder 14 is stored by mistake is reliably prevented.
[0026]
As described above, the aerial work vehicle 1 includes the boom storage detection device that detects the storage state of the boom 30. The device includes a plurality of boom members (the base boom 31) that configure the boom 30. , The intermediate boom 32 and the tip boom 33), a projection 32a provided on a boom member (here, the intermediate boom 32) that moves relative to the traveling body 10 when the boom 30 expands and contracts, and provided on the traveling body 10. And a boom storage detection sensor (limit switch) 64 that outputs a storage detection signal (corresponding to an OFF signal in this case) by contacting the projection 32a with the boom 30 in a predetermined storage posture. If the boom 30 has not taken the up-and-down and telescopic postures (and further the swiveling posture) corresponding to the predetermined storage posture, the switch piece 64a of the boom storage detection sensor 64 will be protruded. It does not come into contact with 32a. Specifically, even if the base end boom 31 is placed on the boom mounting portion 61 of the boom receiver 60, the lever member 62 is not pressed downward by the projection 32a unless the boom 30 is fully contracted. If the boom 30 (the base end boom 31) is not resting on the boom placing portion 61 even if is fully retracted, the lever member 62 will not be pressed downward by the projection 32a. Then, a storage detection signal is output from the boom storage detection sensor 64 only when the boom 30 has a predetermined undulation and expansion / contraction posture corresponding to the storage posture. As described above, in the boom storage detection device, the boom 30 is brought to the predetermined up-down storage position, the telescopic storage position, and the swivel storage position by one detection unit (here, the boom storage detection sensor 64 including a limit switch). Can be detected at the same time, and the storage posture of the boom can be reliably detected even though the configuration is inexpensive.
[0027]
Further, in the aerial work vehicle 1, the jack controller 50 that controls the overhang of the outrigger jack 13 that stably supports the traveling body 10 does not detect the storage of the boom 30 by the boom storage detection sensor 64 (boom). When the storage detection signal is not output from the storage detection sensor 64) (that is, when it is detected that the boom 30 is not in the storage position), the storage operation of each outrigger jack 13 is prohibited. Therefore, when the boom 30 is not in the storage position, the jack interlock mechanism that prohibits the storage operation of the outrigger jack 13 can be configured at low cost.
[0028]
Although the preferred embodiment of the present invention has been described above, the scope of the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the projection 32a that comes into contact with the boom storage detection sensor 64 in the storage position of the boom 30 is an intermediate member of the boom member that moves relatively to the traveling body 10 when the boom 30 expands and contracts. Although the projection is provided on the intermediate boom 32, the projection may be provided on the tip boom 33 as a matter of course. In the above-described example, the reason why the protrusion is provided on the intermediate boom 32 is that the boom 30 in the above-described example is configured such that when the boom 30 expands and contracts, a remarkable boom member moves in the expansion and contraction direction, This is because if the intermediate boom 32 is fully retracted with respect to the base boom 31, the distal boom 33 is always fully retracted with respect to the intermediate boom 32, and therefore the entire boom 30 can be said to be fully retracted. Therefore, if the boom members of the respective stages do not move in conjunction with each other when the boom is extended as described above, but each of the boom members can be operated separately, the boom storage detection sensor 64 is contacted. It is necessary to provide the protruding protrusion on the boom member located at the most distal end side.
[0029]
In the above-described embodiment, the aerial work vehicle equipped with the boom storage detection device according to the present invention is configured to travel by the traveling wheels (tire wheels). However, this is not necessarily the case of traveling by the traveling wheels. Alternatively, the vehicle may travel by a crawler device or the like. Alternatively, it may be an aerial work vehicle for traveling on a track provided with orbital wheels, or an aerial work vehicle or the like having both tire wheels and orbital wheels. . In the above-described embodiment, the case where the boom storage detection device according to the present invention is applied to an aerial work vehicle has been described. However, this is an example, and the present invention is applicable to another boom work vehicle, for example, a crane vehicle. Is also possible.
[0030]
【The invention's effect】
As described above, the boom storage detection device for a boom working vehicle according to the present invention is provided on a boom member that moves relative to the traveling body when the boom extends and contracts, among a plurality of boom members constituting the boom. A projection provided on the traveling body, and storage detecting means (for example, a limit switch) for outputting a storage detection signal by contacting the projection when the boom is in the retracted attitude; The storage detection means does not contact the projection unless the posture is up and down (constrained in most cases), and the boom does not contact the projection until the boom reaches the predetermined up / down and expansion / contraction posture corresponding to the storage posture. The storage detection signal is output. Therefore, in this boom storage detection device, it is possible to simultaneously detect that the boom has reached the predetermined up-and-down storage position and the telescopic storage position by one detecting means, and to ensure the storage posture of the boom while having an inexpensive configuration. Can be detected.
[0031]
Further, in the case where the boom working vehicle includes an outrigger jack provided on the traveling body and extending downward to stably support the traveling body, and control means for controlling the outrigger jack to protrude and retract, the control means Preferably, when the storage detection means detects that the boom is not in the storage position, the storage operation of the outrigger jack is preferably prohibited. When the posture is not set, the so-called jack interlock mechanism that inhibits the storage operation of the outrigger jack can be configured at low cost.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a boom storage detection device according to an embodiment of the present invention, where (A) shows a state where a boom is stored, and (B) shows a state where a boom is not stored. Each is shown.
FIG. 2 is a side view of an aerial work vehicle equipped with the boom storage detection device.
FIG. 3 is a hydraulic circuit diagram relating to operation of an outrigger jack in the aerial work vehicle.
FIG. 4 is a block diagram showing a power transmission relationship between a hydraulic pump and each jack cylinder performed in the aerial work vehicle.
[Explanation of symbols]
1 Aerial work vehicles (boom work vehicles)
10 Running body 13 Outrigger jack 30 Boom 31 Base end boom (boom member)
32 Intermediate boom (boom member)
32a protrusion 33 tip boom (boom member)
Reference Signs List 50 jack controller 51 electromagnetic control valve 52 jack extension operation switch 53 jack storage operation switch 54 boom storage state display lamp 60 boom receiver 62 lever member 63 compression spring 64 boom storage detection sensor (storage detection means)

Claims (4)

A boom provided on a boom work vehicle having a plurality of boom members configured in a telescopic manner and having a telescopically movable boom movably up and down on a traveling body, and detecting a state in which the boom is in a predetermined retracted posture. A work vehicle boom storage detection device,
Of the plurality of boom members, a projection provided on a boom member that moves relative to the traveling body when the boom expands and contracts,
The storage device is provided on the traveling body, and comprises one storage detecting unit that detects the up-and-down storage position and the telescopic storage position of the boom by contacting the projection in a state where the boom is in the storage position. Boom storage detection device of a working boom vehicle. 2. The boom storing and detecting device for a boom working vehicle according to claim 1, wherein the boom is rotatably provided on the traveling body, and the storage detecting means also detects a turning storage position of the boom. 3. The boom operation according to claim 1, wherein said storage detecting means comprises a limit switch which outputs a storage detection signal when a switch piece is pressed by said projection when said boom is in said storage position. Vehicle boom storage detection device. The boom working vehicle includes an outrigger jack that is provided on the traveling body and protrudes downward to stably support the traveling body, and a control unit that performs extended storage control of the outrigger jack,
The said control means inhibits the storage operation of the outrigger jack when the boom is not in the storage posture by the storage detection means, The storage means is in any one of Claims 1-3 characterized by the above-mentioned. Boom storage detection device for boom working vehicles.

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