JP2013086882A - Device of controlling operation of jack of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device of controlling the operation of a jack of a working vehicle, capable of letting an operator place a plank underneath the jack without a shift in a short time and check the ground and an obstacle thereon.SOLUTION: The device 60 of controlling the operation of a jack attached to a vehicle 1 for a high lift work includes a plurality of outrigger jacks disposed on a car body to support the same by extending at least in the lower direction thereof, a jack-operating device 50 of operating the expansion/contraction of this jack, and a controller 61 that controls the expanding/contracting action of a plurality of jack cylinders 25 of the outrigger jacks according to the operation of the jack-operating device 50. The controller 61 suspends the extending operation of the jack cylinders 25 at a position thereof shortly before the ground is touched by each of the jack cylinders 25 if the operation of automatically extending the outrigger jacks is carried out by the automatic extension SW50a of the jack-operating device 50, and causes the jack cylinders 25 to extend by the subsequent operation of the automatic extension SW50a.

Description

  The present invention relates to a jack operation control device for a working vehicle provided with a jack that can extend at least downward.

  Generally, when a work vehicle equipped with a jack is lifted and supported by a jack, if the ground on which the jack is grounded is soft ground, the ground is uneven, or the ground is inclined, the jack and the ground In order to increase the ground contact area, a floor is installed between the ground plate provided at the lower end of the jack and the ground.

  Among such jacks, there is a working vehicle provided with an outrigger jack of a type in which the jack is grounded and lifted and supported in a state where the jack extends obliquely downward toward the outside in the vehicle width direction when extended. When such a working vehicle is lifted and supported by the outrigger jack, the outrigger jack moves downward while moving outward in the vehicle width direction as it extends, so the outrigger jack moves between the ground plate of the outrigger jack and the ground. It is difficult to predict the position of the installed floor. For this reason, when installing a flooring between this grounding plate and the ground, there is a possibility that the relative position of the flooring is shifted with respect to the grounding plate when the outrigger jack is grounded.

  On the other hand, a support device has been proposed that enables the position adjustment of the floor to be extended when the jack is extended (see Patent Document 1). In this support device, when the operation switch of the jack is operated, each jack provided at the front and rear of the vehicle extends, and when the grounding detection sensor provided at each jack detects the grounding of each jack, each jack extends. The jacks are shrunk until operation stops and there is no ground contact detection for each jack. For this reason, when laying a laying under the jack when the jack is grounded, even if the laying is displaced due to the grounding of the jack, the displacement of the laying can be adjusted by reducing the jack.

JP 2000-16798 A

  In this conventional support device, when the jack is grounded once, the jack is shrunk, and the displacement of the shrub is adjusted after the jack is shrunk. Compared with it, it takes time to complete the installation of the floor.

  In addition, when using this conventional support mechanism to install a floor under an outrigger jack that projects diagonally downward to the side of the vehicle when extended, the outrigger jack extends diagonally downward, so installation on the ground of the floor The position is difficult to understand. For this reason, there exists a possibility that the installation position of a flooring may shift | deviate, and there exists a possibility that confirmation of the ground in which a flooring is installed, and the obstruction which exists in the ground may become inadequate.

  The present invention has been made in view of such problems, and can be installed in a short time without misalignment under the jack. It is an object of the present invention to provide a jack operation control device for a working vehicle that can be sufficiently confirmed.

  In order to achieve the above object, a jack operation control device for a working vehicle according to the present invention includes a jack (outrigger jacks 13 and 13 'in the embodiment) provided on a vehicle body and extending at least below the vehicle body to support the vehicle body. A jack operation means for operating the expansion / contraction operation of the jack (the jack operation device 50 in the embodiment), and a jack control means for controlling the expansion / contraction operation of the jack according to the operation of the jack operation means (the controller 61 in the embodiment). A jack operation control device for a work vehicle (elevated work vehicle 1 in the embodiment), wherein the jack control means is grounded when the jack is extended by the jack operation means. The extension operation of the jack is stopped at the position before the stop (stop position Ps in the embodiment). (Claim 1).

  Further, the present invention is characterized in that the jack is an overhanging type jack or a link type jack that can project obliquely downward to the side of the vehicle body.

  The present invention also includes jack posture detecting means (tilt angle sensor 40, extension sensor 65 in the embodiment) for detecting whether or not the jack is in a position to stop before the grounding when the jack is extended, The jack control means determines the attitude of the jack according to the detection value detected by the jack attitude detection means, and when the determined jack attitude becomes a position at a position before the jack contacts the jack, The operation is stopped (claim 3).

  Furthermore, the present invention has jack stop position detecting means (proximity switch 36 in the embodiment) for detecting whether or not the jack has reached a stop position before grounding when the jack is extended. When it is detected by the jack stop position detecting means that the jack has reached the stop position, the extension operation of the jack is stopped (claim 4).

  The jack of the present invention is provided on the front side and the rear side of the vehicle body, and the jack control means is configured such that when the jack is extended by the extension operation of the jack operation means after the extension operation of the jack is stopped, the vehicle body is substantially omitted. The jack provided on the front side of the vehicle body and the jack provided on the rear side of the vehicle body are operated to extend until they become horizontal (claim 5).

  The jack control means of the present invention is characterized in that the stop position can be adjusted before the jack contacts the ground (Claim 6).

  According to the jack operation control device for a work vehicle according to the present invention, the ground can be installed under the jack without any deviation in a short time by having the above-described feature, and the ground on which the floor is installed. It is possible to provide a jack operation control device for a working vehicle that can sufficiently check the state and whether or not there is an obstacle.

The state explanatory drawing of the aerial work vehicle which mounts the jack operation control device concerning one embodiment of the present invention is shown. The state perspective view of the outrigger jack provided in the vehicle body front side concerning one embodiment of the present invention is shown. The state perspective view of the inclination angle sensor for detecting the attitude | position of the outrigger jack provided in the vehicle body front side concerning one embodiment of this invention is shown. 1 is a perspective view showing a state of an outrigger jack equipped with a proximity switch for detecting the posture of an outrigger jack provided on the rear side of a vehicle body according to an embodiment of the present invention. The principal part perspective view of the link mechanism part for demonstrating the action | operation of the proximity switch concerning one embodiment of this invention is shown. The state perspective view of the outrigger jack provided with the proximity switch concerning one embodiment of the present invention is shown. The block diagram of the jack operation control apparatus of this invention is shown. The state explanatory view for explaining extension operation of an outrigger jack by the jack operation control device concerning one embodiment of the present invention is shown. The state explanatory view for explaining extension operation of an outrigger jack by the jack operation control device concerning one embodiment of the present invention is shown. The flowchart in the case of lifting and supporting a vehicle with the jack operation control apparatus concerning one embodiment of this invention is shown. The rear view of the outrigger jack provided with the length sensor for detecting the length of the outrigger jack concerning the present invention is shown. The rear view of the outrigger jack provided with the proximity switch concerning one embodiment of the present invention is shown.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a best mode embodiment of a work vehicle jack operation control apparatus according to the present invention will be described with reference to FIGS. First, a work vehicle equipped with a jack operation control device will be outlined with reference to FIGS. 1 (a-1) and 1 (a-2). The present embodiment will be described by taking as an example an aerial work vehicle in which a work table is provided at the tip of the telescopic boom as a work vehicle. 1A-1 is a side view of the aerial work vehicle, and the left side of FIG. 1A-2 is an explanatory view of the rear left outrigger jack in the rear view of the aerial work vehicle. The right side of 1 (a-2) shows an outrigger jack on the right side of the front part of the aerial work vehicle in the rear view.

  As shown in FIG. 1A-1 (side view), the aerial work vehicle 1 can travel with a pair of front wheels 4 and rear wheels 5 on both sides in the vehicle body width direction before and after the vehicle body 3. A driving cabin 6 is provided at the front part of the vehicle body 3, and a swivel base 7 is provided at the rear part of the vehicle body 3 so as to freely turn. The swivel base 7 is provided with a telescopic boom 10 that can be raised and lowered via a hoisting cylinder 9, and a work base 11 on which an operator can ride is provided at the tip of the telescopic boom 10.

  The pair of front wheels 4 are provided in the driving cabin 6 and configured to be steerable, and the pair of rear wheels 5 are configured to be able to rotate by receiving power from an engine provided in the vehicle body 3. The front wheel 4 and the rear wheel 5 can be braked according to the pressing operation of the brake pedal provided in the driving cabin 6, and the rear wheel 5 can be braked according to the operation of the side brake lever provided in the driving cabin 6 It is configured.

  Outrigger jacks 13, 13 ′ that stably support the vehicle body 3 are provided on the vehicle body front side on the rear side of the driving cabin 6 and on both sides in the vehicle width direction on the vehicle body rear side. There are two types of outrigger jacks 13, 13 ′: an outrigger jack 13 provided on the front side of the vehicle body 3 and an outrigger jack 13 ′ provided on the rear side of the vehicle body 3 (see FIG. 1 (a-2)). These outrigger jacks 13, 13 ′ expand and contract by operation of a jack operating device 50 provided at the rear portion of the vehicle body 3 to support the vehicle body 3 and to be stored in the vehicle body 3.

  Next, the outrigger jack 13 provided on the front side of the vehicle body 3 will be described with reference to FIGS. 2 (a) shows a perspective view of the outrigger jack 13 in the retracted state, and FIG. 2 (b) shows a perspective view of the outrigger jack 13 in a state stopped at a position before the grounding. 2 (c) shows a state perspective view of the outrigger jack 13 in the fully extended state. 3A is a perspective view of the tilt angle sensor 40, and FIGS. 3B and 3C are perspective views of the link mechanism 30 to which the tilt angle sensor 40 is attached. As shown in FIGS. 2A, 2B, and 2C, the outrigger jack 13 is provided in the frame 14 and a box-like frame 14 that is attached to the vehicle body 3 and extends in the vertical direction. And a link mechanism portion 30 connected between the frame 14 and the jack cylinder 25.

  The frame 14 is arranged at an upper portion and extends in a substantially horizontal direction, a pair of side plate portions 16 and 17 that are connected to both front and rear end portions of the top plate portion 15 and extend downward, and these side plate portions. 16 and 17 and a back plate portion 18 connected between the inner end portions. The top plate portion 15 is formed in a rectangular shape in plan view. The inner end portions of the side plate portions 16 and 17 extend in a substantially vertical direction, while the outer end portions of the side plate portions 16 and 17 are gradually inclined in the inner direction as they proceed downward. For this reason, the frame 14 is formed in a box shape having an outer end portion and a lower end portion opened. An attachment plate 19 is attached to the back plate portion 18, and the frame 14 is attached to an end portion in the width direction of the vehicle body 3 through the attachment plate 19.

  An upper shaft portion 20 is provided between the pair of side plate portions 16 and 17 at an upper portion in the frame 14. The rod side end portion of the jack cylinder 25 is rotatably connected to the upper shaft portion 20. A lower shaft portion 21 supported between the pair of side plate portions 16 and 17 is provided at the lower portion in the frame 14. Both end portions of the lower shaft portion 21 protrude outward from the corresponding side plate portions 16 and 17, and the link mechanism portion 30 is rotatably connected to the protruding lower shaft portion 21.

  The jack cylinder 25 is a hydraulic cylinder configured such that a cylinder rod 27 can protrude into a cylinder tube 26. The jack cylinder 25 is disposed so that the tip end portion of the cylinder rod 27 is connected to the upper shaft portion 20 and extends downward. A ground plate 28 is rotatably provided at the lower end of the cylinder tube 26. A projecting portion 29 for connecting the distal end portion of the link mechanism portion 30 described above is provided at the longitudinal intermediate portion of the cylinder tube 26. The protrusion 29 is formed in a rectangular shape in plan view.

  The link mechanism portion 30 has a pair of link members 31 and 32 that are pivotally connected in the vertical direction to the end portions of the lower shaft portion 21 that extends from the lower outer side of each of the pair of side plate portions 16 and 17. It becomes. The pair of link members 31 and 32 are made of a metal material and have the same shape. The link members 31 and 32 are formed in a plate shape, and one end portions thereof are pivotally connected to the lower portions of the side plate portions 16 and 17, and the other end portions are pivotally connected to the side surfaces of the projecting portions 29.

  The longitudinal lengths of the link members 31 and 32 and the installation position of the protruding portion 29 with respect to the cylinder tube 26 are such that the jack cylinder 25 is slightly inclined inward in the frame 14 when the jack cylinder 25 is fully contracted. (See FIG. 2A), the jack cylinder 25 is provided so as to be inclined obliquely outward in the outer side of the frame 14 when the jack cylinder 25 is fully extended.

  For this reason, when the jack cylinder 25 is fully contracted, the pair of link members 31 and 32 rotate upward with the lower shaft portion 21 which is a connection portion with the side plate portions 16 and 17 as a pivot, and the jack cylinder 25 is stored in a state of being slightly inclined inwardly in the frame 14 (hereinafter referred to as a storage state) (see FIG. 2A). When the jack cylinder 25 is extended from the fully reduced state, the pair of link members 31 and 32 are rotated downward with the lower shaft portion 21 as a rotation fulcrum as the jack cylinder 25 is extended. It rotates in the outer direction of the frame 14 using 20 as a rotation fulcrum (see FIG. 2B). When the jack cylinder 25 is fully extended, the pair of link members 31 and 32 further rotate downward, and the jack cylinder 25 is inclined obliquely outward in the outside of the frame 14 (hereinafter referred to as an overhanging state). (See FIG. 2C). For this reason, when the jack cylinder 25 is extended, the jack extension width in the vehicle body width direction of the jack cylinder 25 can be increased.

  Further, when the jack cylinder 25 is extended from the fully contracted state and the pair of link members 31 and 32 are rotated downward and moved to a position slightly inclined upward from the horizontal direction (see FIG. 2B). The grounding plate 28 of the jack cylinder 25 stops at a position before the grounding (hereinafter referred to as a stop position Ps). This stop position Ps is a position where a below-mentioned floor can be inserted into a later-described gap formed between the ground and the ground plate 28. Specifically, the height of the gap is the sum of the heights of the margins considering the thickness of the floor and the ease of insertion into the gap of the floor.

  Next, an inclination angle sensor that detects the attitude of the outrigger jack 13 will be described. As shown in FIG. 3A, the tilt angle sensor 40 includes a sensor main body 41 formed in a box shape and a shaft 42 provided on the sensor main body 41 so as to be rotatable forward and backward. . The tilt angle sensor 40 is a so-called potentiometer that outputs a detection signal (voltage signal) according to the rotation angle of the shaft 42 with respect to the sensor main body 41.

  As shown in FIG. 3B, the shaft 42 of the tilt angle sensor 40 is fixed to a connection plate portion 43 that is integrally attached to the end portion of the lower shaft portion 21. On the other hand, the support body 44 is connected to the bottom of the sensor body 41 of the tilt angle sensor 40, an engagement recess is formed at the tip of the support plate 44, and is connected to the outer surface of the link member 31. An engaging pin 46 protruding from the plate portion 45 is locked in the engaging recess. For this reason, the sensor main body 41 is fixed to the link member 31 via the support plate 44, the engagement pin 46, and the plate portion 45. Therefore, as shown in FIGS. 3B and 3C, when the link member 31 is rotated in the vertical direction, the sensor body 41 is rotated with respect to the shaft 42, and the tilt angle sensor 40 is linked. A detection signal corresponding to the rotation angle of the member 31 is uniquely output.

  On the other hand, as described above, as shown in FIG. 2B, the outrigger jack 13 is configured so that the link mechanism portion 30 rotates in the vertical direction in accordance with the expansion and contraction of the jack cylinder 25 and the jack cylinder 25 extends in the vehicle body width direction. Change the tilt angle. For this reason, since the inclination angle of the jack cylinder 25 in the vehicle body width direction corresponds to the detection signal from the inclination angle sensor 40, the inclination angle of the jack cylinder 25 in the vehicle body width direction is determined by the detection signal from the inclination angle sensor 40. Can know. Although details will be described later, the controller that controls the extension operation of the jack cylinder 25 has an inclination angle corresponding to the position at which the jack cylinder 25 stops before contacting the ground, and when the jack cylinder 25 is fully contracted. The tilt angle and the tilt angle when the jack cylinder 25 is fully extended are stored.

  Next, the outrigger jack 13 ′ provided on the rear side of the vehicle body 3 will be described with reference to FIGS. 4 and 5. 4 (a) shows a perspective view of the outrigger jack 13 ′ in the retracted state, FIG. 4 (b) shows a perspective view of the outrigger jack 13 ′ in a state of being stopped at a position before the grounding, FIG. 4 (c) shows a perspective view of the outrigger jack 13 ′ in the fully extended state. FIG. 5A shows a perspective view of the main part of the link mechanism 30 when the outrigger jack 13 ′ reaches the stop position before the ground contact, and FIG. 5B shows another view of FIG. 5A. The principal part perspective view of the link mechanism part 30 when the outrigger jack 13 'seen from an angle reaches | attains the stop position before the ground contact is shown.

  The outrigger jack 13 ′ provided on the rear side of the vehicle body has substantially the same configuration as the above-described outrigger jack 13 provided on the front side of the vehicle body, and therefore differs from the outrigger jack 13 provided on the front side of the vehicle body. Only the same mode parts as the outrigger jack 13 will be denoted by the same reference numerals, and the description thereof will be omitted.

  As shown in FIGS. 4A, 4B, and 4C, the outrigger jack 13 ′ has a support plate 35 attached to the lower outer side of the back plate portion 18 of the frame. One end of the support plate 35 is fixed to the back plate 18, the other side extends to the outside of the one side plate 17, is bent toward the link member 32, and the tip end on the other side is rotated by the link member 32. It is located above the end of the lower shaft portion 21 that serves as a fulcrum. A proximity switch 36 (see FIGS. 5A and 5B) capable of detecting the presence or absence of the metal-made link member 32 is attached to the other end of the support plate 35.

  The proximity switch 36 is configured to output a detection signal when the link member 32 serving as a detection body approaches and exists in this detection region. For this reason, the proximity switch 36 detects that the link member 32 exists in front of the proximity switch 36 in the state in which the jack cylinder 25 is stored (see FIG. 4A), and the jack cylinder 25 extends. Thus, if the link member 32 does not exist in front of the proximity switch 36, the link member 32 cannot be detected (see FIGS. 5A and 5B).

  The proximity switch 36 having such a function is provided at a position where the link member 32 moves from the inside to the outside of the detection area of the proximity switch 36 when the ground plate 28 of the jack cylinder 25 moves to a position before the grounding plate 28 contacts the ground. (See FIG. 4B, FIG. 5A, and FIG. 5B). For this reason, when the ground plate 28 of the jack cylinder 25 moves to a position before the grounding, the detection signal of the proximity switch 36 is switched from ON to OFF.

  The proximity switch 36 moves in a direction in which the link member 32 moves away from the proximity switch 36 when the jack cylinder 25 extends and the ground plate 28 moves beyond the position before the grounding plate 28 contacts the grounding side. The OFF detection signal is maintained. For this reason, even if the jack cylinder 25 is further extended to be fully extended, the detection signal of the proximity switch 36 remains OFF. For this reason, when it is desired to detect that the jack cylinder 25 is in the fully extended state by the proximity switch 36, the proximity switch 36 cannot detect the fully extended state of the jack cylinder 25 with the structure as it is.

  Therefore, as shown in FIGS. 6A, 6B, and 6C, the jack cylinder 25 is fully extended on the upper surface on the lower shaft portion 21 side that is the pivot point of the link member 32. In other words, a detected member 37 for turning on the detection signal of the proximity switch 36 is provided. 6A shows a perspective view of the state of the outrigger jack 13 ′ stopped at a position before the outrigger jack 13 ′ contacts the ground, and FIG. 6B shows the outrigger jack 13 ′ of FIG. FIG. 6C is a perspective view in which the main part of the outrigger jack 13 ′ is enlarged when the outrigger jack 13 ′ is fully extended.

  The detected member 37 is formed of the same metal material as that of the link member 32, one end portion is fixed to the upper surface of the link member 32, the other end side extends upward, and is bent toward the lower shaft portion 21 side. Is formed so as to bend downward and extend toward the lower shaft portion 21 side, and is formed in an inverted U shape in a side view.

  The tip end portion 37a on the other end side of the member 37 to be detected is disposed so as to be positioned within the detection region of the proximity switch 36 when the jack cylinder 25 is fully extended (see FIG. 6C). A rectangular space 37b is formed between the one end side and the other end side of the detected member 37 in a side view. This space portion 37b is for preventing the proximity switch 36 from detecting the detected member 37 while the jack cylinder 25 is fully extended from the position before the ground contact.

  Next, a jack operation control device 60 that controls expansion and contraction of each jack cylinder 25 of the outrigger jacks 13 and 13 ′ will be described with reference to FIG. FIG. 7 shows a block diagram of the jack operation control device 60. As shown in FIG. 7, the jack operation control device 60 corresponds to the jack operation device 50, the tilt angle sensor 40 and the proximity switch 36 provided on the outrigger jacks 13 and 13 ′, and the operation of the jack operation device 50. The controller 61 controls the expansion / contraction operation of the jack cylinder 25 and controls the expansion / contraction of the jack cylinder 25 in accordance with detection signals from the tilt angle sensor 40 and the proximity switch 36.

  For convenience of explanation, the inclination angle sensor 40 provided on the left outrigger jack 13 on the left side in the vehicle width direction on the front side of the vehicle body 3 is referred to as “tilt angle sensor left front 40a”, and the outrigger on the right side in the vehicle width direction on the front side of the vehicle body 3 is described. The tilt angle sensor 40 provided on the jack 13 is referred to as “tilt angle sensor right front 40b”, and the proximity switch 36 provided on the outrigger jack 13 ′ on the left side in the vehicle width direction on the rear side of the vehicle body 3 is referred to as “proximity switch left rear 36a”. The proximity switch 36 provided on the outrigger jack 13 'on the rear side of the vehicle body 3 in the vehicle body width direction is referred to as "proximity switch right rear 36b".

  Further, the controller 61 is electrically connected to an operation control valve V that controls supply / discharge of hydraulic oil to / from each jack cylinder 25, and the corresponding operation control valve V operates in response to a command signal from the controller 61. The jack cylinder 25 expands and contracts.

  For convenience of explanation, the jack cylinder 25 of the outrigger jack 13 on the left side in the vehicle width direction on the front side of the vehicle body 3 is referred to as “jack cylinder left front 25a”, and the jack cylinder of the outrigger jack 13 on the right side in the vehicle width direction on the front side of the vehicle body 3 is described. 25 is referred to as “jack cylinder right front 25b”, and the jack cylinder 25 of the outrigger jack 13 ′ on the left side in the vehicle width direction on the rear side of the vehicle body 3 is referred to as “jack cylinder left rear 25c”. The jack cylinder 25 of the right outrigger jack 13 ′ is referred to as “jack cylinder right rear 25d”.

  The jack operating device 50 is an automatic overhang that is operated when the four outrigger jacks 13 and 13 ′ are simultaneously extended and operated, in addition to the operation levers for operating the expansion and contraction of the four outrigger jacks 13 and 13 ′. A switch 50a (automatic extension SW) is provided.

  The controller 61 controls the expansion / contraction operation of the jack cylinder 25 of the corresponding outrigger jacks 13 and 13 ′ according to the operation of the operation lever of the jack operation device 50. Further, when the automatic overhanging SW 50a is turned on, the controller 61, as will be described in detail later, is configured so that the vehicle body 3 of the aerial work vehicle 1 is lifted and supported by the four outrigger jacks 13 and 13 ′. The extension operation of the outrigger jacks 13, 13 'is controlled.

  Next, the control content of the jack operation control device 60 when the automatic extension SW 50a is turned on will be described with reference to FIGS. 1, 7, and 8 to 10. FIG. 8A-1 shows a side view of the aerial work vehicle 1 in a state where the outrigger jacks 13, 13 ′ are stopped at a position before the ground contact, and the right side of FIG. The state explanatory drawing of the right front outrigger jack 13 in the rear view of the work vehicle 1 is shown, and the left side of FIG. 8 (b-1) shows a side view of the aerial work vehicle 1 with the outrigger jacks 13 and 13 'grounded, and the right side of FIG. The state explanatory view of the right front outrigger jack 13 in the rear view is shown, and the left side of FIG. 8B-2 shows the state explanatory view of the left rear outrigger jack 13 ′ in the rear view of the aerial work vehicle 1.

  9 (c-1) shows a side view of the aerial work vehicle with the front outrigger jack 13 extended, and the right side of FIG. 9 (c-2) is the right side of the aerial work vehicle 1 in the rear view. A state explanatory view of the front outrigger jack 13 is shown, and the left side of FIG. 9 (c-2) is a state explanatory view of the left rear rear outrigger jack 13 'in the rear view of the aerial work vehicle 1, and FIG. -1) is a side view of the aerial work vehicle 1 with the front and rear outrigger jacks 13 and 13 'extended, and the right side of FIG. FIG. 9D-2 shows a state explanatory diagram of the left rear rear outrigger jack 13 ′ in the rear view of the aerial work vehicle 1. FIG. 10 shows a flowchart when the vehicle is lifted and supported by the jack operation control device 60.

  As shown in FIGS. 1 (a) and 1 (b), the four outrigger jacks 13 and 13 'are in the retracted state in a state where the aerial work vehicle 1 is able to travel and stops at the work site. It is in. In order to lift and support the aerial work vehicle 1 in this state, first, the above-described side brake of the aerial work vehicle 1 is operated to bring the rear wheel 5 into a locked state. Then, as shown in FIG. 10, the operator turns on the automatic extension SW 50a of the jack operating device 50 (see FIG. 7) (step 100). When the automatic extension SW 50a is turned on, the controller 61 extends the jack cylinders 25 of the four outrigger jacks 13, 13 ′ (step 101).

  When the four jack cylinders 25 are extended, the controller 61 performs 4 according to the detection signals from the sensors of the tilt angle sensor left front 40a, the tilt angle sensor right front 40b, the proximity switch left rear 36a, and the proximity switch right rear 36b. It is determined whether or not each jack cylinder 25 of the book has moved to the stop position Ps before the ground (step 102).

  When any of the four jack cylinders 25 exceeds the stop position, the controller 61 stops the extension of the jack cylinder 25 beyond the stop position, as shown in FIGS. 8 (a-1) and 8 (a-2). (Step 103). The extension stop control of the jack cylinder 25 is performed until all of the four jack cylinders 25 are stopped.

  When all four jack cylinders 25 are stopped at the stop position, a gap C into which a below-mentioned floor can be inserted is formed between the ground plate 28 of the jack cylinder 25 and the ground G.

  When gaps C are formed between the ground plates 28 of all four jack cylinders 25 and the ground G, as shown in FIG. 8 (b-1) and FIG. A floor 52 is installed in a gap C formed between the ground plate 28 of the jack cylinder 25 and the ground G (step 104). When the flooring 52 is installed in the gap C, the grounding board 28 contacts the flooring 52 with a slight gap formed between the grounding board 28 and the upper surface of the flooring 52.

  When the floor 52 is installed, the operator turns on the automatic extension SW 50a again (step 105). When the automatic extension SW 50a is turned on again, the controller 61 extends the jack cylinder left front 25a and the jack cylinder right front 25b as shown in FIGS. 9C-1 and 9C-2 (step 106).

  When the two jack cylinder left front 25a and the jack cylinder right front 25b extend, the controller 61 causes the two jack cylinder left front 25a to respond to the detection signals from the sensors of the tilt angle sensor left front 40a and the tilt angle sensor right front 40b described above. Then, it is determined whether or not the jack cylinder right front 25b is fully extended (step 107).

  When one of the two jack cylinder left front 25a and jack cylinder right front 25b is fully extended, the controller 61 stops the extension of the fully extended jack cylinder 25 (step 108). Then, Step 107 is executed until all the two jack cylinder left front 25a and jack cylinder right front 25b are fully extended. When the two jack cylinder left front 25a and jack cylinder right front 25b are fully extended, as shown in FIGS. 9 (c-1) and 9 (c-2), the aerial work vehicle 1 has the rear wheel 5 Is in a state where the front side of the vehicle is lifted up while being grounded.

  Here, in the process where the two jack cylinder left front 25a and jack cylinder right front 25b are fully extended, the rear wheel 5 of the vehicle is always in contact with the ground G until the front wheel 4 is completely lifted. Since the wheel 5 is in a locked state, there is no possibility that the vehicle will run away. Further, when the jack cylinder left front 25a and the jack cylinder right front 25b extend after the front wheel 4 is completely lifted, the vehicle is further tilted rearward, and the jack cylinder left rear 25c and jack cylinder right rear 25d are grounded in addition to the rear wheel 5. To do. When the jack cylinder left front 25a and the jack cylinder right front 25b are further extended from this state, the rear wheel 5 is lifted, and the jack cylinder left rear 25c and the jack cylinder right rear 25d are brought into a grounding state receiving a reaction force from the ground. For this reason, the slip amount in the vehicle width direction when the jack cylinder left rear 25c and the jack cylinder right rear 25d are extended can be reduced.

  When all the two jack cylinder left front 25a and jack cylinder right front 25b are fully extended, the controller 61 extends the jack cylinder left rear 25c and jack cylinder right rear 25d on the vehicle rear side (step 109).

  When the two jack cylinder left rear 25c and jack cylinder right rear 25d are extended, the controller 61 determines whether the two jacks correspond to the detection signals from the sensors of the proximity switch left rear 36a and the proximity switch right rear 36b. It is determined whether or not the cylinder 25 is fully extended (step 110).

  When either one of the two left and right jack cylinders 25c and 25d is fully extended, the controller 61 stops the extension of the fully extended jack cylinder 25 (step 111). Then, step 110 is executed until all the two jack cylinder left rear 25c and jack cylinder right rear 25d are fully extended.

  When all two jack cylinder left rear 25c and jack cylinder right rear 25d are fully extended, as shown in FIGS. 9 (d-1) and 9 (d-2), the vehicle is lifted and supported. Complete.

  As described above, when the floor bar 52 is installed when the work vehicle 1 is lifted and supported by the four outrigger jacks 13 and 13 ′, the jack cylinder 25 is temporarily stopped at a position before the ground contact (stop position Ps). Thus, a gap C is formed between the ground G and the floor 52 can be inserted, and the floor 52 is installed on the ground G so that the floor 52 is inserted into the gap C. Since the clearance C has a margin enough to allow for the height of the basement 52 and the insertion of the basement 52, the outrigger jacks 13 and 13 'projecting in the vehicle width direction as the jack cylinder 25 extends. It is possible to easily recognize and install the installation position of the plinth 52. Therefore, it is possible to reduce the displacement of the floor 52 from the jack cylinder 25 with respect to the ground plate 28, and to sufficiently check the state of the ground G on which the floor 52 is installed and whether or not there is an obstacle.

  In addition, since the four outrigger jacks 13 and 13 ′ are extended and the aerial work vehicle 1 is lifted and supported after the installation of the floor 52, the jack cylinder 25 is extended and then contracted to reduce the position of the floor 52. Compared with the case where the jack cylinder 25 is extended and the vehicle is lifted and supported thereafter, the working time for lifting and supporting the aerial work vehicle 1 can be shortened.

  In the embodiment described above, the jack cylinder left front 25a and the jack cylinder right front 25b provided on the front side of the vehicle detect the attitude of the jack cylinder 25 by the tilt angle sensor 40 (40a, 40b). 11A and 11B, the extension amount of the cylinder rod 27 with respect to the cylinder tube 26 is detected by the extension sensor 65, and the posture of the jack cylinder 25 may be detected based on the detected value. . Here, FIG. 11A shows a rear view of the outrigger jack 13 when the outrigger jack 13 is in a contracted state, and FIG. 11B shows the outrigger when the outrigger jack 13 stops at a position just before grounding. A rear view of the jack 13 is shown.

  In this case, the cylinder tube 26 is rotatably connected to the upper shaft portion 20 of the frame 14, and the jack cylinder 25 (25a, 25b) is disposed on the frame 14 so that the rod side end portion is positioned below. Also, the main body side of the extension sensor 65 is attached in the frame 14, and the tip end of the wire W provided so as to be able to protrude from the main body portion is attached to the tip end of the cylinder rod 27.

  When the extension sensor 65 is used in this way, the jack cylinder 25 (25a, 25b) is made to correspond to the detection value of the extension sensor 65 and the entire length of the jack cylinder 25 (25a, 25b) in advance. The jack cylinder 25 (25a, 25b) can be brought into a fully extended state by causing the jack cylinder 25 (25a, 25b) to stop at a position just before the jack cylinder 25 (25a, 25b) contacts the ground.

  In the above-described embodiment, the proximity switch 36 (36a, 36b) provided on the outrigger jack 13 ′ on the rear side of the vehicle is configured to detect the link member 32, but FIG. 12 (a) and FIG. b) As shown in FIG. 12C, the proximity switch 36 (36a, 36b) may be attached to the back plate portion 18 of the frame 14 so as to face the jack cylinder 25. Here, FIG. 12A shows a rear view of the outrigger jack 13 ′ when the outrigger jack 13 ′ is in a contracted state, and FIG. 12B shows a stop before the outrigger jack 13 ′ comes into contact with the ground. FIG. 12 (c) shows a rear view of the outrigger jack 13 ′ when the outrigger jack 13 ′ is in a fully extended state.

  In this case, when the jack cylinder 25 is fully contracted, the proximity switch 36 (36a, 36b) detects the cylinder tube 26 of the jack cylinder 25 and the detection signal is turned on, and the position before the jack cylinder 25 is grounded. As the cylinder rod 27 extends, the cylinder tube 26 moves from the inside to the outside of the detection area of the proximity switch 36 (36a, 36b), the detection signal is switched from ON to OFF, and the jack cylinder 25 further extends. Until the cylinder tube 26 is fully extended, the cylinder tube 26 moves further away from the proximity switch 36 (36a, 36b) and maintains the detection signal OFF.

  In the above-described embodiment, the jack cylinder 25 is configured to stop at a position before the ground (stop position Ps). However, the stop position PS may be changed. In this case, the controller 61 shown in FIG. 7 can calculate the extension amount of the jack cylinder 25 (25a, 25b) according to the detection values from the tilt angle sensor left front 40a and the tilt angle sensor right front 40b. The jack cylinders 25 (25a, 25b) are made to correspond in advance to the stop positions to be changed 25 (25a, 25b), so that the jacks can be detected from the detected values from the tilt angle sensor left front 40a and the tilt angle sensor right front 40b. The stop position of the cylinder 25 (25a, 25b) can be uniquely set.

  When the stop position of the jack cylinder 25 (25a, 25b) can be changed in this way, when it is necessary to install a plurality of the floor coverings 52 according to the state of the ground G, the jack cylinder 25 (25a, 25b) The stop position can be changed to a higher position.

  Further, in the above-described embodiment, the case where the outrigger jacks 13 and 13 ′ are the link type is shown, but the jack cylinder itself may be attached obliquely in the vehicle body width direction.

  In the above-described embodiment, the case where the tilt angle sensor 40 is provided in the front outrigger jack 13 on the front side of the vehicle and the proximity switch 36 is provided in the rear outrigger jack 13 ′ on the rear side of the vehicle is shown. , 13 ′ may be provided with the tilt angle sensor 40 or the proximity switch 36, or the proximity switch 36 may be provided on the front outrigger jack 13 of the vehicle and the tilt angle sensor 40 may be provided on the rear outrigger jack 13 ′ of the vehicle.

  Moreover, you may provide the load detection sensor which can detect that the load acted on the four jack cylinders 25. FIG. By providing this load detection sensor, it is possible to confirm the inclination state of the vehicle and prevent the vehicle from falling over.

  As shown in FIG. 1, the aerial work vehicle 1 is provided with a telescopic boom 10, and the telescopic boom 10 is stored so as to extend substantially horizontally when the vehicle body is stored. The telescopic boom 10 is provided with a undulation angle sensor for detecting the undulation angle. If the undulation angle sensor is set so that the tilt angle of the telescopic boom 10 can be detected with respect to the horizontal plane, the undulation angle sensor can detect the inclination of the vehicle body in the front-rear direction, so that the vehicle is in a horizontal state. Can do.

  Instead of the tilt angle sensor 40 and the proximity switch 36, a distance measuring sensor may be attached to the ground plate 28 of the jack cylinder 25 to detect the distance between the ground plate 28 and the ground G. If it does in this way, extension of jack cylinder 25 can be stopped according to the unevenness of ground G, and installation work of flooring 52 can be made easy.

  In the embodiment described above, a potentiometer having a shaft 42 is shown as the tilt angle sensor 40 (see FIG. 3A), but a gyro sensor may be used.

  In the above-described embodiment, the outrigger jacks 13 and 13 ′ in which all the jack cylinders 25 project obliquely are shown. However, a jack that partially extends in the vertical direction may be used.

  In the above-described embodiment, when the outrigger jacks 13 and 13 ′ are automatically extended, the automatic extension SW 50a provided in the jack operation device 50 is operated. It may be provided in the driving cabin 6 or anywhere in the vehicle body 3.

  In the above-described embodiment, the aerial work vehicle 1 is shown as an example of the work vehicle. However, a mobile crane, a tow truck, or a vehicle carrier may be used.

1 Aerial work vehicle (work vehicle)
3 Car body 13, 13 'Outrigger jack (jack)
36 Proximity switch (jack stop position detection means)
40 Tilt angle sensor (jack posture detection means)
50 Jack operation device (jack operation means)
60 Jack operation control device 61 Controller (jack control means)
65 Extension sensor (jack posture detection means)
Ps Stop position (front position)

Claims (6)

A jack provided on the vehicle body and extending at least below the vehicle body to support the vehicle body, a jack operation means for operating the expansion / contraction operation of the jack, and controlling the expansion / contraction operation of the jack according to the operation of the jack operation means A jack operation control device for a working vehicle comprising a jack control means,
The jack control means stops the extension operation of the jack at a position before the jack contacts the ground when the jack is operated to extend by the jack operation means. Control device.   2. The jack operation control device for a work vehicle according to claim 1, wherein the jack is an overhanging jack or a link type jack that can project obliquely downward to a side of the vehicle body. Comprising jack attitude detecting means for detecting whether or not the jack is in a position to stop before the jack is grounded when the jack is extended;
The jack control means determines a posture of the jack according to a detection value detected by the jack posture detection means, and when the determined posture of the jack is a posture at a position before the jack contacts the ground. 3. The jack operation control device for a work vehicle according to claim 2, wherein the extension operation of the jack is stopped. Jack stop position detecting means for detecting whether or not the jack has reached a stop position before the grounding when the jack is extended,
The jack for a working vehicle according to claim 2, wherein the jack control means stops the extension operation of the jack when the jack stop position detecting means detects that the jack has reached the stop position. Actuation control device. The jacks are provided on the front side and the rear side of the vehicle body,
When the jack is extended by the extension operation of the jack operation means after stopping the extension operation of the jack, the jack control means includes a jack provided on the front side of the vehicle body until the vehicle body becomes substantially horizontal, The jack operation control device for a working vehicle according to any one of claims 1 to 4, wherein a jack provided on a rear side of the vehicle body is extended.   The jack operation control device for a working vehicle according to any one of claims 1 to 5, wherein the jack control means is capable of adjusting a stop position before the jack contacts the ground.

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