JP5474617B2 - Outrigger jack device for aerial work vehicle - Google Patents

Description

  The present invention relates to an aerial work vehicle, for example, a fire truck with a ladder equipped with a telescopic ladder (including a refraction type), a fire truck with a refractive ladder equipped with a telescopic / refractive boom, a telescopic Equipped with a high-altitude water truck equipped with a refracting water tower, a rescue vehicle equipped with a telescopic crane device, and a telescopic boom for performing wall painting, overhead wire, lifting, etc. The present invention relates to an outrigger jack device that is mounted on a high-altitude work vehicle, a crane vehicle equipped with a telescopic crane device for performing operations such as loading and unloading of a transfer object at a high place.

  As described above, various working moving bodies that can be moved three-dimensionally by operations including expansion, contraction, undulation, and turning are mounted on the body of an aerial work vehicle. In this case, a moment in the direction of overturning the vehicle body (falling moment) acts. For example, outrigger jack devices are installed at two front and rear sides (total of four locations) on both sides of the vehicle body in order to stably support the vehicle body even when such a falling moment is applied and to perform work at high places safely. The The outrigger jack device is also simply referred to as an outrigger device or a jack device.

  The outrigger jack device is attached to a holding member fixed to the vehicle body, and is extendable in the horizontal direction (extendable to the side of the vehicle body), and is attached to the tip of the outrigger beam and is extendable in the vertical direction. A jack is provided to support the vehicle body against an overturning moment by extending the outrigger beam and then extending and grounding the jack.

  The overturning moment acting on the vehicle body changes depending on the moving amount and working radius of the work moving body, and the magnitude of the overturning moment that can be supported by the outrigger jack device is the extension amount of the outrigger beam, strictly speaking, from the fully contracted state. Varies depending on the amount of extension. Therefore, the outrigger jack device or the vehicle body is usually provided with detection means for detecting the extension amount of the outrigger beam from the fully contracted state. As a means for detecting the amount of beam expansion, for example, Patent Document 1 discloses a configuration in which a plurality of limit switches are arranged along a cylinder body in which an outrigger beam is inserted. A configuration is disclosed in which a potentiometer provided in a cylindrical body with an outrigger beam inserted therein is used as a main part. Japanese Patent Application Laid-Open No. H10-228667 discloses a configuration in which a surveillance camera and an image recognition unit are main parts.

JP 2001-19361 A Japanese Patent Laid-Open No. 2005-126019 JP 2009-73248 A

  An aerial work platform may be used not only on flat ground but also on sloping ground.In such a case, the height of each outrigger jack device is adjusted by adjusting the amount of jack extension, and Maintain level. Therefore, in an outrigger jack device mounted on an aerial work vehicle, it is desired that not only the beam extension amount but also the jack extension amount can be accurately detected. However, in the outrigger jack apparatus disclosed in Patent Documents 1 and 3 described above, no consideration is given to a means for detecting the jack extension amount. In addition, the above-mentioned Patent Document 2 discloses a configuration in which detection means for detecting the jack extension amount is provided in a form that is separated and independent from the detection means for detecting the beam extension amount. There is a problem that the jack device is complicated and expensive.

  Therefore, for example, an attempt has been made to indirectly detect the amount of jack extension using an inclinometer that detects the inclination angle of the vehicle body and a timer that measures the extension time of the jack. It is difficult to detect the amount accurately. Therefore, after all, it is inevitable that the inclination correction must be performed manually, and the inclination correction cannot be performed quickly and accurately.

  An object of the present invention is to provide an outrigger jack device for an aerial work vehicle capable of detecting not only the extension amount of an outrigger beam but also the extension amount of a jack, while having a simple structure. It is to make it easy to correct the inclination of a car at low cost.

  In order to solve the above problems, the present invention provides an outrigger jack device for an aerial work vehicle in which a working moving body capable of three-dimensional movement is mounted on a vehicle body, and is attached to a holding member fixed to the vehicle body. , Which is equipped with an outrigger beam that can be expanded and contracted in the horizontal direction and a jack that is mounted at the tip of the outrigger beam and that can be expanded and contracted in the vertical direction, so that the expansion and contraction of the outrigger beam is allowed only when the jack is fully contracted. The flexible member is wound on either the holding member or the jack on the basis of the winding portion where the flexible member is unwound and wound up, and the outrigger beam and the fully contracted state of the jack. A detecting means having a detecting portion for detecting the amount of unwinding is fixed, and a flexible strip unwound from the winding portion is attached to the other of the holding member or the jack, and the outrigger beam and the jack are extended and contracted. Providing outrigger jack device for aerial platforms, characterized in that to fix the leading end of the flexible strip member while stretched along the direction.

  Here, the "moving body for work" in the present invention includes a telescopic ladder (including a tip-refractive type), a telescopic / refractive or telescopic boom, a telescopic or refractive water tower, a telescopic tower. Type crane equipment and the like. In addition, as described above, the “aerial work vehicle” referred to in the present invention includes a fire engine with a ladder, a fire engine with a refraction ladder, a high-altitude water truck, a rescue work vehicle, wall painting and lifting at a high place, etc. Work vehicles, crane vehicles, etc. Furthermore, the “flexible strip” as used in the present invention can be stretched along the direction of expansion / contraction of the outrigger beam and the direction of expansion / contraction of the jack (can be bent at the boundary between the outrigger beam and the jack), and the outrigger beam. Or what can be smoothly unwound and wound in with respect to a winding part with expansion / contraction of a jack, for example, a wire, a belt, a chain etc. can be mentioned.

  According to the configuration of the present invention described above, the unwinding amount of the flexible strip detected by the detection unit in the fully contracted state of the jack is the extension amount from the fully contracted state of the outrigger beam (hereinafter referred to as “beam extension amount δ1”). Can be obtained as In addition, the unwinding amount of the flexible strip detected by the detecting unit when the fully contracted state of the jack is released is determined by the beam extension amount δ1 and the extension amount from the fully contracted state of the jack (hereinafter referred to as “jack extension amount”). δ2 ”) and the total amount (total extension amount δ3). If it is desired to obtain the jack extension amount δ2 as an independent value, δ1 may be subtracted from δ3.

  In the outrigger jack apparatus according to the present invention, as described above, the detection means is provided on either the holding member or the jack that holds the outrigger beam in a telescopic manner, and the flexible member unwinds from the winding portion of the detection means. By fixing the distal end of the striatum to the other of the holding member or the jack, the beam extension amount δ1, the jack extension amount δ2, and the total extension amount δ3 can be obtained. In other words, in the outrigger jack device according to the present invention, each of the above expansion amounts can be obtained only by using a single detection means. Therefore, it is possible to correct the inclination of an aerial work vehicle while simplifying the structure and reducing the cost as compared with the one disclosed in Patent Document 2 in which each extension amount is detected using two separate and independent detection means. It becomes possible to contribute to the simplification of the process.

  In the outrigger jack device of the present invention, as described above, the expansion and contraction of the outrigger beam is allowed only when the jack is fully contracted. In other words, since the operation of the outrigger beam is restricted when the jack is extended and grounded, the jack breakage that may occur when the outrigger beam is operated with the jack extended and grounded (outrigger jack device Failure) is prevented in advance. Such a so-called interlock structure is also employed in existing outrigger jack devices. Therefore, it can be said that the present invention effectively uses a so-called interlock structure for detection of the beam extension amount and the jack extension amount.

  The outrigger jack apparatus having the above configuration further includes a storage element that stores the amount of unrolling of the flexible strip detected in the fully contracted state of the jack as an internal memory value when the fully contracted state of the jack is released. It can be. In other words, the unwinding amount of the flexible strip detected in the fully contracted state of the jack is the beam extension amount δ1. In this case, the control system (arithmetic processing unit) can be configured such that the beam expansion amount δ1 stored as the internal memory value in the storage element is subtracted each time from the total expansion amount δ3 detected during jack expansion. Therefore, if the memory element as described above is further provided, both the beam extension amount δ1 and the jack extension amount δ2 can be accurately obtained as separate and independent values even when the outrigger jack device is operated. Therefore, the work time required for the inclination correction is shortened, and the work efficiency is improved. Since the memory element is an inexpensive and minute component, the outrigger jack device is not complicated or increased in size, and no particular cost increase occurs.

  Further, the outrigger jack device having the above configuration reads and stores the internal memory value stored in the storage element when the power is turned off (when the power is turned off), and reads when the power is turned on again (when the power is turned on). A non-volatile memory that writes the stored internal memory value back to the storage element may be further included. According to such a configuration, even when the power is turned off and then turned on again when the jack is extended, there is no contradiction in the detection result of the jack extension amount. Therefore, it is preferable that the beam extension amount δ1 and the jack extension amount δ2 can always be accurately grasped.

  As described above, according to the present invention, it is possible to provide an outrigger jack device for an aerial work vehicle capable of detecting not only the beam extension amount but also the jack extension amount with a simple structure. . This makes it possible to easily and smoothly correct the inclination of an aerial work vehicle and improve work efficiency.

It is an example of an aerial work vehicle to which the outrigger jack device according to the present invention is mounted, and is a side view of a fire engine with a ladder. It is a schematic side view of an outrigger jack apparatus. It is a schematic side view which shows the time of an outrigger beam extension. It is a schematic side view which shows the time of expansion | extension of a jack. Both (a) and (b) are diagrams schematically illustrating another embodiment of the arithmetic processing unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view of a fire engine 1 with a ladder as an aerial work vehicle. The ladder-equipped fire engine 1 includes a vehicle body (vehicle main body) 2 and a telescopic ladder 3 as a working moving body mounted on the vehicle body 2. On the vehicle body 2, a turning table 4 capable of turning around a turning axis on the vertical axis is disposed, and a support frame 5 is attached to the turning table 4. The base portion of the ladder 3 is attached to the support frame 5 so as to be movable up and down via a horizontal shaft. An operation seat 6 on which an operator (operator) gets on and operates the ladder 3 is provided on the side of the support frame 5.

  As is well known, the ladder 3 is constructed by nesting a plurality of ladder members, and includes a telescopic cylinder (for example, a hydraulic cylinder) 3a as a telescopic drive means and a telescopic operation mechanism 3b mainly composed of a wire and a pulley. The hoisting cylinder (for example, hydraulic cylinder) 3c as the hoisting driving means is operated to extend and retract, and the turning table (for example, hydraulic motor) 3d as the turning driving means is rotated together with the turntable 4. A basket 3e is movably attached to the tip of the ladder 3, and a lifter 3f is slidably installed on the upper surface (back surface) of the ladder 3.

  Outrigger jack devices 10 are mounted on the front and rear sides of the vehicle body 2, and when the fire engine 1 with a ladder arrives in the vicinity of the fire site, the outrigger jack device 10 is operated to dispose the vehicle body 2 on the ground. To support stably. Thus, after the vehicle body 2 is stably supported on the ground, an operator gets on the operation seat 6 and operates the ladder 3 to perform a fire fighting operation and a rescue operation.

  Hereinafter, the outrigger jack apparatus 10 which is the gist of the present invention will be described in detail.

  FIG. 2 shows a schematic side view of the outrigger jack device 10. The outrigger jack apparatus 10 shown in the figure includes an outrigger mechanism 20, a jack mechanism 30, a detection means 40, a jack position detector 50, and an arithmetic processing unit 60 as main components.

  The outrigger mechanism 20 includes a cylindrical holding member 21 that is fixed to the vehicle body 2 and extends in the horizontal direction, and an outrigger beam 22 that is attached to the holding member 21 and that can extend and contract in the horizontal direction. The outrigger beam 22 has a base end connected to a driving means (not shown) disposed inside the holding member 21 (for example, a hydraulic cylinder), and receives a driving force from the driving means to the holding member 21. On the other hand, it expands and contracts in the horizontal direction.

  The jack mechanism 30 includes a cylindrical holding member 31 that is fixed to the distal end of the outrigger beam 22 and that extends in the vertical direction, and a jack 32 that is attached to the holding member 31 and is extendable in the vertical direction. . The base end of the jack 32 is connected to a driving means (not shown) (for example, a hydraulic cylinder) disposed inside the holding member 31, so that the jack 32 receives the driving force from the driving means to the holding member 31. Telescopically (moves up and down) in the vertical direction. A pulley 34 is fixed to the outer surface of the holding member 31 via a bracket 33. Near the lower end of the jack 32, a flange portion 32a is provided that projects in the horizontal direction. The flange portion 32a has a distal end of a wire 42 as a flexible strip F shown below via a connecting member 35. It is fixed.

  The detection means 40 is fixed to the outer surface of the holding member 21 via a support member 41, and includes a winding unit 43 and a detection unit 44. The winding portion 43 is provided to be rotatable with respect to the holding member 21, and a wire 42 as a flexible strip F is wound around the outer periphery thereof. Accordingly, the wire 42 wound around the winding portion 43 can be unwound and wound (winded) with respect to the winding portion 43.

  In FIG. 2, the outrigger beam 22 and the jack 32 are fully contracted, and the wire 42 unwound from the winding portion 43 in this state is bent by 90 ° so as to be along the pulley 34 fixed to the holding member 31. Then, the tip is fixed to the flange portion 32 a of the jack 32 via the connecting member 34. The winding portion 43 is always energized with a rotational force in the direction in which the wire 42 is wound, so that the wire 42 unwound from the winding portion 43 is not slackened. From the above configuration, the wire 42 is stretched along the expansion / contraction direction (horizontal direction) of the outrigger beam 22 and the expansion / contraction direction (vertical direction) of the jack 32, and when the outrigger beam 22 or the jack 32 is expanded, the amount of expansion is increased. A corresponding length of wire 42 is unwound from the winding portion 43. On the other hand, when the outrigger beam 22 or the jack 32 is shortened, the wire 42 having a length corresponding to the shortening amount is wound around the winding portion 43.

  The detection means 40 of the present embodiment is a so-called length measurement sensor in which a detection unit 44 is provided integrally with the winding unit 43. More strictly speaking, the detection unit 40 is based on the fully contracted state of the outrigger beam 22 and the jack 32. And a potentiometer or a rotary encoder configured to detect the amount of unwinding of the wire 42 when the detecting unit 44 detects the amount of rotation (rotation angle) of the winding unit 43 therefrom. Note that the winding unit 43 and the detection unit 44 may be provided separately.

  The jack position detector 50 is disposed on the outer diameter side of the flange portion 32a. The jack position detector 50 detects whether or not the jack 32 is in a fully contracted state, and uses a non-contact type proximity switch (also referred to as a proximity sensor) here. As the jack position detector 50, a contact type limit switch can be adopted in addition to the non-contact type proximity switch. The detection value of the jack position detector 50 is input to a control system (not shown) of driving means for expanding and contracting the outrigger beam 22. More specifically, the jack position detector 50 functions as an interlock of the outrigger beam 22, and in a state where the detector 50 detects the fully contracted state of the jack 32 (“proximity ON” state). Allows the outrigger beam 22 to expand and contract. On the other hand, in a state where the jack 32 is extended and the detector 50 does not detect the fully contracted state of the jack 32 (“proximity OFF” state), the expansion / contraction of the outrigger beam 22 is restricted. By providing such a jack position detector 50 and restricting the expansion / contraction of the outrigger beam 22 when the jack 32 is extended, the jack 32 may be broken when the outrigger beam 22 is expanded / contracted when the jack 32 is extended, and thus the outrigger jack device. Ten failures are prevented in advance.

  The detection unit 44 of the detection means 40 is connected to the arithmetic processing unit 60. Based on the output signal of the detection unit 44, the arithmetic processing unit 60 expands the outrigger beam 22 from the fully contracted state (beam expansion amount δ1) and the expansion amount of the jack 32 from the fully contracted state (jack expansion amount δ2). And the total value (total extension amount δ3) of the two extension amounts δ1 and δ2 as follows, and these are not shown in the figure provided at the driver's seat of the operation seat 6 and the ladder-equipped fire truck 1 or the like. A signal is output so as to be monitored and displayed on the display device.

  First, as shown in FIG. 3, when the outrigger beam 22 is extended, the wire 42 is unwound from the winding portion 43, and this unwinding amount is detected by the detecting portion 44 of the detecting means 40. When the outrigger beam 22 is extended, the jack position detector 50 detects the fully contracted state of the jack 32 (the “close proximity ON” state), so that the wire 42 detected by the detection unit 44 is detected. The unwinding amount is processed as the beam expansion amount δ1. Next, as shown in FIG. 4, the extension of the jack 32 is started. When the jack 32 is extended, that is, in the “close proximity” state, the expansion and contraction of the outrigger beam 22 is restricted. The amount of the wire 42 that is unwound from the winding unit 43 along with the expansion, that is, the amount of unwinding of the wire 42 that is detected by the detection unit 44 is the total extension amount δ3 that is the sum of the beam extension amount δ1 and the jack extension amount δ2. It is processed. In this case, in order to obtain the jack extension amount δ2 as an independent value, the beam extension amount δ1 is subtracted from the total extension amount δ3 obtained when the extension of the jack 32 is stopped.

  As described above, the outrigger jack device 10 according to the present invention is provided with the detection means 40 on the holding member 21 that holds the outrigger beam 22 so as to be extendable and retracts the wire 42 unwound from the winding portion 43 of the detection means 40. By fixing the tip of the wire 42 to the jack 32 on the driving side while being stretched along the expansion / contraction direction of the beam 22 and the expansion / contraction direction of the jack 32, the beam extension amount δ1, the jack extension amount δ2, and the total extension amount δ3. It is possible to obtain. In other words, in the present invention, the extension amounts δ1 to δ3 can be obtained only by using the single detection means 40. Therefore, compared with the conventional configuration in which the beam extension amount and the jack extension amount are detected by using two separate and independent detection means, the structure is simplified and the cost is reduced, but an aerial work vehicle (for example, the above ladder) is used. It becomes possible to contribute to facilitation of the inclination correction of the attached fire engine 1).

  In addition, in the outrigger jack device 10 described above, strictly speaking, in the arithmetic processing unit 60 of the outrigger jack device 10, the unwinding amount of the wire 42 detected in the fully contracted state of the jack 32 is indicated by the fully contracted state of the jack 32. It is also possible to provide a storage element M1 that stores an internal memory value when released, that is, when the expansion of the jack 32 is started (see FIG. 5A).

  The unwinding amount of the wire 42 detected in the fully contracted state of the jack 32 is, in other words, the beam extension amount δ1. In this case, the arithmetic processing unit 60 can be configured to subtract the beam extension amount δ1 stored as the internal memory value in the storage element M1 from the total extension amount δ3 detected when the jack 32 is extended. Therefore, if the memory element M1 is further provided, both the beam extension amount δ1 and the jack extension amount δ2 can be accurately obtained as independent values even when the outrigger jack device 10 is operated. Therefore, the work time required for the inclination correction of the high-altitude work vehicle such as the fire truck 1 with a ladder can be shortened, and the work efficiency is improved. Since the memory element M1 is an inexpensive and minute component, the outrigger jack device 10 is not complicated and expensive.

  The arithmetic processing unit 60 reads and saves the internal memory value stored in the storage element M1 when the power is turned off (when the power is turned off), and reads and saves the power when the power is turned on again (when the power is turned on). A non-volatile memory M2 for writing the internal memory value back to the memory element M1 can be further provided (see FIG. 5B). According to such a configuration, even when the power is turned off and then turned on again when the jack 32 is extended, there is no contradiction in the detection result of the jack extension amount δ2. Therefore, it is preferable that the beam extension amount δ1 and the jack extension amount δ2 can always be accurately grasped.

  In the above-described embodiment, the detection unit 40 is fixed to the outside of the holding member 21 of the outrigger mechanism 20 and the wire 42 is stretched along the outer surface of the holding members 21 and 31. The wire 42 can be stretched along the inner surfaces of the holding members 21 and 31. In this case, since the wire 42 is protected by the holding members 21 and 31, the possibility that the wire 42 is damaged or cut by the scattered objects is effectively reduced.

  In the above-described embodiment, the detection means 40 having the winding portion 43 and the detection portion 44 is fixed to the holding member 21 of the outrigger beam 22, while the tip of the wire 42 is fixed to the jack 32 (the flange portion 32a). However, conversely, the detection means 40 may be fixed to the jack 32 and the tip of the wire 42 may be fixed to the holding member 21 of the outrigger beam 22.

  In the above-described embodiment, the wire 42 is used as the flexible strip F. However, the usable flexible strip F is not limited to the wire 42. In other words, the flexible strip F can be stretched along the expansion / contraction direction of the outrigger beam 22 and the jack 32 (can be bent by 90 ° along the pulley 34), and the expansion / contraction of the outrigger beam 22 or the jack 32 can be expanded. It is only necessary that the winding unit 43 can be smoothly unwound and wound according to the operation, and a belt or a chain can also be used.

  Furthermore, the method for detecting the unwinding amount of the flexible strip F is not limited to the detection of the rotation angle of the winding portion 43 as described above. For example, when the flexible strip F is constituted by a belt in which innumerable holes are provided at predetermined intervals along the unwinding direction, the belt is unwound as the outrigger beam 22 or the jack 32 extends. In addition, it is possible to detect the unwinding amount of the flexible strip F by configuring the detection unit 44 to count the number of holes that have passed.

  The above-described outrigger jack device 10 according to the present invention includes an aerial work vehicle other than the fire engine 1 with a ladder that requires inclination correction, such as a fire engine with a refractor ladder, an aerial water truck, a rescue vehicle, It can be preferably mounted on a work vehicle, a crane vehicle, or the like that performs wall painting or lifting work at a high place.

1 Fire engine with ladder (aerial work vehicle)
2 Car body 3 Ladder (working vehicle)
DESCRIPTION OF SYMBOLS 10 Outrigger jack apparatus 20 Outrigger mechanism 21 Holding member 22 Outrigger beam 30 Jack mechanism 31 Holding member 32 Jack 34 Pulley 40 Detection means 42 Wire (flexible strip)
43 Winding unit 44 Detection unit 50 Jack position detector 60 Arithmetic processing unit F Flexible strip M1 Storage element M2 Non-volatile memory δ1 Beam expansion amount (extension amount of outrigger beam from fully contracted state)
δ2 Jack extension (Jack extension from fully contracted state)
δ3 Total extension

Claims (3)

An outrigger jack device for an aerial work vehicle on which a working moving body capable of three-dimensional movement is mounted on a vehicle body, and is mounted on a holding member fixed to the vehicle body, and is capable of extending and contracting horizontally. , Which is attached to the tip of the outrigger beam and includes a jack that is vertically extendable,
The expansion and contraction of the outrigger beam is configured to allow only in the fully contracted state of the jack,
The flexible member is wound around one of the holding member and the jack so that the flexible strip can be unwound and wound freely, and the flexible member is based on the fully contracted state of the outrigger beam and the jack. Fixing a detection means having a detection unit for detecting the amount of unwinding of the strip,
The other end of the holding member or the jack, the flexible strip that has been unwound from the winding portion is stretched along the outrigger beam and the expansion / contraction direction of the jack, and the distal end of the flexible strip An outrigger jack device for an aerial work vehicle, characterized in that is fixed.   A storage element that stores the unwinding amount of the flexible strip detected by the detection unit in the fully contracted state of the jack as an internal memory value when the fully contracted state of the jack is released; The outrigger jack device for an aerial work vehicle according to claim 1,   It further comprises a nonvolatile memory that reads and saves the internal memory value stored in the storage element when the power is turned off, and writes back the read and stored internal memory value to the storage element when the power is turned on again. The outrigger jack apparatus for an aerial work vehicle according to claim 2.

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