JP2011098813A - Outrigger device of working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outrigger device of a working vehicle capable of preventing forgetting of locking of an outrigger member taking a storage attitude and forgetting of release of the locking. <P>SOLUTION: A lock means includes: a movable lock member 41 to be driven by a lock cylinder 44; a lock part 42 provided in the outrigger member 16 to lock the outrigger member 16 by the movable lock member 41 located at a lock position in a state of the outrigger member 16 taking the storage attitude; a controller 29; and a second hydraulic pump 32, a selector valve 36 and a driving pipeline 48 as means for holding the movable lock member 41 at a release position against a spring 47 in a bottom chamber by supplying discharge oil to a rod chamber 44b of the lock cylinder 44 during an input of a command signal from a grounding command switch 37 commanding grounding of the outrigger member 16 to the controller 29 and during an input of a command signal from a storage command switch 38 commanding storage of the outrigger member 16 to the controller 29. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an outrigger member that can be changed between a retracted posture that fits within a vehicle width of the work vehicle, a grounding posture that projects to the side of the work vehicle and contacts the ground, and a lock unit that locks the outrigger member in the retracted posture. The outrigger apparatus of the working vehicle provided with.

  Conventionally, a lock means of an outrigger device of a work vehicle includes a locking hole provided in a support portion of the outrigger member, a locking hole provided in the outrigger member, and a locking pin that can be inserted into the locking holes. Have The positions of the two locking holes are set so that they overlap when the outrigger member is in the retracted position. By inserting the locking pins into these two locking holes, the outrigger member is in the retracted position. It is locked so as not to move in the direction of the contact posture. (See Patent Document 1)

JP 10-297875 A (paragraph 0013, paragraph 0014, FIG. 8, FIG. 7)

  In the conventional outrigger device described above, the outrigger member is locked and unlocked by a person. For this reason, there is a concern that the work vehicle is caused to travel in a state in which the lock is forgotten to be locked, and that the outrigger device is damaged by operating the outrigger member in a state in which the lock is forgotten to be released.

  The present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide an outrigger device for a work vehicle that can prevent forgetting to lock and unlock the outrigger member in the retracted posture. There is.

  In order to achieve the above object, an outrigger device for a work vehicle according to the present invention is configured as follows.

[1] An outrigger device for a work vehicle according to the present invention is rotatably provided on a support portion fixed to the work vehicle, and is disposed in a retracted position positioned within a vehicle width of the work vehicle and on a side of the work vehicle. An outrigger member that can change to a grounding posture that protrudes and contacts the ground, an outrigger drive control unit that drives and controls the outrigger member, and changes the posture of the outrigger member from the retracted posture to the grounding posture with respect to the outrigger drive control unit A grounding command means for outputting a command; a storage command means for outputting a command for changing the attitude of the outrigger member from a grounding attitude to a retracted attitude to the outrigger drive control means; and a lock for locking the outrigger member in the retracted attitude. An outrigger device for a work vehicle, wherein the lock means is provided at the support portion and is released from a lock position. A movable lock member that can be moved between positions, biasing means that biases the movable lock member to define the initial position of the movable lock member as a lock position, and the grounding command means to the outrigger drive control means. A lock member drive control means for holding the movable lock member at the release position against the urging force of the urging means while the command is continuously output, and provided on the outrigger member, And a contact plate that contacts the movable lock member positioned at the lock position and engages the outrigger member in the retracted state.

  In the outrigger device for a work vehicle described in [1], when the attitude of the outrigger member is changed from the retracted attitude to the ground attitude, the operator operates the ground command means. As a result, a command signal is output from the ground command means to the outrigger drive control means. At this time, the lock member drive control means of the lock means moves the movable lock member from the lock position to the release position against the urging force of the urging means. Thereby, the contact plate provided in the outrigger member is released from the locked state. In other words, the outrigger member is allowed to rotate so as to protrude to the side of the work vehicle, that is, the lock is released.

  On the other hand, the outrigger drive control means to which the command signal from the grounding instruction means is input tries to rotate the outrigger member so as to project to the side of the work vehicle. As described above, when the command signal is output from the grounding attitude means to the outrigger drive control means, the locking means is in a state in which the outrigger member is allowed to be extended, that is, in the unlocked state, so the attitude of the outrigger member is stored. Change from posture to ground posture. That is, the operator can change the posture of the outrigger member from the retracted posture to the grounded posture by continuing to operate the grounding command means.

  Conversely, when the attitude of the outrigger member is changed from the ground attitude to the retracted attitude, the operator operates the retract command means. As a result, a command signal is output from the storage command means to the outrigger drive control means, and the outrigger drive control means that receives this command signal rotates the outrigger member toward the work vehicle.

  When the lock member drive control means holds the movable lock member at the release position against the urging force of the urging means while the command signal continues to be output from the storage command means to the outrigger drive control means, The contact plate provided on the member changes from the ground posture to the retracted posture without contacting the movable lock member.

  If the operator stops the operation of the storage command means while the outrigger member is in the storage posture, the command signal is not output from the storage command means to the outrigger drive control means, and accordingly, the lock member drive control means is movable lock The holding of the member in the release position is terminated. As a result, the movable lock member returns to the lock position by the urging force of the urging means. As a result, the contact plate is locked to the movable lock member. That is, the outrigger member is locked in the retracted posture.

  In addition, when the command signal continues to be output from the storage command means to the outrigger drive control means, the lock member drive control means does not hold the movable lock member at the release position against the biasing force of the biasing means. The movable lock member is held in the locked position by the urging force of the urging means. For this reason, the contact plate contacts the movable lock member while the outrigger member is rotated in the direction of the work vehicle. Thereafter, the contact plate rotates in the direction of the work vehicle together with the outrigger member while pushing the movable lock member in the direction of the release position against the urging force of the urging means. When the outrigger member is in the retracted position, the contact plate is detached from the movable lock member. Along with this, the movable lock member returns to the lock position by the urging force of the urging means, whereby the contact plate is locked by the movable lock member. That is, the outrigger member is locked in the retracted posture.

  When the locking means operates in this way, the outrigger member that has been retracted is forgotten to be locked when the attitude of the outrigger member changes from the grounding attitude to the retracted attitude and when the attitude changes from the retracted attitude to the grounding attitude. In addition, it is possible to prevent forgetting to unlock.

[2] The outrigger device for a work vehicle according to the present invention is the outrigger device for a work vehicle described in “[1]”, wherein the lock member drive control means includes a lock cylinder that is a single rod type hydraulic cylinder, and the lock A hydraulic pump that discharges the pressure oil supplied to the cylinder, a switching valve interposed between the hydraulic pump and the lock cylinder, and a switching valve control means for controlling the switching valve, the movable lock member being The spring is provided in a portion of the rod protruding from the cylinder tube of the lock cylinder, and the biasing means is provided in a bottom chamber of the lock cylinder and generates a biasing force in a direction of pushing out the rod from the cylinder tube. The switching valve is a self-returning valve, and the valve position of the switching valve is an initial stage for communicating the rod chamber with the hydraulic oil tank. The switching valve control means outputs a command signal from the ground command means to the outrigger drive control means. The switch valve is set to be held in the operating position while continuing.

  In the outrigger device for a work vehicle described in “[2]”, the lock means operates as follows.

  When a command signal is output from the ground command means to the outrigger drive control means, the switching valve control means of the lock member drive control means supplies power to the switching valve. As a result, the switching valve switches from the initial position to the operating position, and the oil discharged from the hydraulic pump flows into the rod chamber of the lock cylinder through the switching valve, and the rod of the lock cylinder is pulled inward of the cylinder tube against the spring. . As the rod moves, the movable lock member moves from the lock position to the release position.

  When the command signal is no longer output from the ground command means to the outrigger drive control means, the switching valve control means of the lock member drive control means stops supplying power to the switching valve. As a result, the switching valve self-returns from the operating position to the initial position, and the pressure oil in the rod chamber of the lock cylinder communicates with the hydraulic oil tank via the switching valve. Accordingly, the rod of the lock cylinder returns from the release position to the lock position while pushing away the pressure oil in the rod chamber by the spring.

[3] The outrigger device for a work vehicle according to the present invention is the outrigger device for a work vehicle according to “[1]”, wherein the outrigger drive control unit is configured such that the cylinder tube is rotatably supported by the support portion. An outrigger cylinder, which is a one-rod hydraulic cylinder rotatably supported by the outrigger member, a first hydraulic pump that discharges pressure oil supplied to the outrigger cylinder, the first hydraulic pump, A directional control valve interposed between the outrigger cylinders and directional switching valve control means for controlling the directional control valve, the directional control valve being a self-returning three-position valve; As a position, a neutral position where the first hydraulic pump communicates with the hydraulic oil tank, and a port on the bottom chamber side of the outrigger cylinder communicates with the first hydraulic pump. A first switching position where a port on the rod chamber side of the outrigger cylinder communicates with the hydraulic oil tank; a port on the rod chamber side of the outrigger cylinder communicates with the first hydraulic pump; and a bottom chamber of the outrigger cylinder A second switching position for communicating the port on the side with the hydraulic oil tank is set, and the direction switching valve control means, while the outrigger drive control means continues to receive a command from the ground command means, The directional control valve is controlled so that its valve position is switched to the first switching position, and while the outrigger drive control means continues to receive a command from the storage command means, The valve position is controlled to be switched to the second switching position, and there is a gap between the direction control valve and the bottom chamber of the outrigger cylinder. A hydraulic pilot type bottom chamber side operation check valve that blocks the flow of pressure oil in the direction from the bottom chamber toward the direction control valve is provided between the direction control valve and the rod chamber of the outrigger cylinder. Is provided with a hydraulic pilot type rod chamber side operation check valve that blocks the flow of pressure oil in the direction from the rod chamber toward the direction control valve. A lock cylinder that is a cylinder, and a second hydraulic pump that is different from the first hydraulic pump that discharges pressure oil supplied to the lock cylinder, and the movable lock member extends from a cylinder tube of the lock cylinder. The urging means is provided in the bottom chamber of the lock cylinder, and the rod is attached to the cylinder. A spring that generates an urging force in the direction of pushing out from the tube, and a pipe pressure through which the second hydraulic pump discharges pressure oil has a pilot pressure applied to each of the bottom chamber side operation check valve and the rod chamber side operation check valve. A pilot line that leads pressure oil is branched and provided upstream of the two pilot lines on the pipe line, and a drive pipe line that leads pressure oil to the rod chamber of the lock cylinder is branched and provided. A switching valve is provided upstream of the drive pipeline on the pipeline, and the switching valve is a self-returning valve, and the valve position of the switching valve allows the rod chamber to communicate with the hydraulic oil tank. It is set so as to be switchable from an initial position to an operating position for guiding the discharge oil of the second hydraulic pump to the rod chamber, and the outrigger drive control means and the The hook member drive control means shares the switching valve control means for controlling the switching valve, and the switching valve control means is configured to output a command from the ground command means to the outrigger drive control means. The switching valve is set to be held in the operating position.

  The outrigger device for a work vehicle described in “[3]” operates as follows to perform unlocking of the outrigger member by the locking means and change of the attitude of the outrigger member.

  While the command signal is being output from the ground command means to the outrigger drive control means, and while the command signal is being output from the storage command means to the outrigger drive control means, the switching valve control means supplies power to the switching valve. The valve position of the switching valve is maintained from the initial position to the operating position. Along with this, the discharge oil of the second hydraulic pump is supplied as pilot pressure to both the bottom chamber side operation check valve and the rod chamber side operation check valve through the switching valve, and thereby, from the bottom chamber of the outrigger cylinder to the direction control valve. Both the flow of pressure oil in the direction toward and the flow of pressure oil in the direction from the rod chamber of the outrigger cylinder toward the direction control valve are permitted. Also, the oil discharged from the second hydraulic pump flows into the rod chamber of the lock cylinder through the switching valve and the drive pipe, and thereby the rod of the lock cylinder is drawn into the cylinder tube against the spring. As the rod moves, the movable lock member moves from the lock position to the release position. In other words, the outrigger member in the retracted position is in the unlocked state.

  When the outrigger drive control means receives a command signal from the ground command means, the outrigger valve control means of the outrigger drive control means supplies power to the direction control valve. As a result, the valve position of the direction control valve is switched from the neutral position to the first switching position, and the discharge oil of the first hydraulic pump flows into the bottom chamber of the outrigger cylinder through the direction switching valve, and pushes the rod of the outrigger cylinder out of the cylinder tube. Try to. The flow of pressure oil in the direction from the rod chamber of the outrigger cylinder to the direction control valve is permitted as a result of the pilot pressure being applied to the rod chamber side operation check valve through the switching valve as described above, and the outrigger Since the member is unlocked, the rod of the outrigger cylinder is pushed out of the cylinder tube by the pressure oil flowing into the bottom chamber while pushing the pressure oil in the rod chamber through the direction switching valve to the hydraulic oil tank. Along with this, the outrigger member is rotated so as to project to the side of the work vehicle to change from the retracted posture to the ground posture.

  When the outrigger drive control means inputs a command signal from the storage command means, the outrigger valve control means of the outrigger drive control means supplies power to the direction control valve. As a result, the valve position of the directional control valve is switched from the neutral position to the second switching position, and the discharged oil of the first hydraulic pump flows into the rod chamber of the outrigger cylinder through the directional switching valve and tries to pull the rod of the outrigger cylinder into the cylinder tube. To do. The flow of pressure oil in the direction from the bottom chamber of the outrigger cylinder to the directional control valve is permitted as the pilot pressure is applied to the bottom chamber side operation check valve through the switching valve as described above, and is movable. Since the lock member is in the release position, the rod of the outrigger cylinder moves inwardly of the cylinder tube while the pressure oil flowing into the bottom chamber pushes back the pressure oil in the bottom chamber to the hydraulic oil tank through the direction switching valve. Pulled out, the outrigger member is rotated in the direction of the work vehicle to change from the ground posture to the retracted posture.

  According to the present invention, it is possible to prevent forgetting to lock and unlock the outrigger member in the retracted position as described above. Therefore, it is possible to prevent the work vehicle from traveling in a state where it has been forgotten to be locked, and it is possible to prevent damage to the outrigger device caused by operating the outrigger member in a state where it has been forgotten to be unlocked.

1 is a left side view of a work vehicle according to an embodiment of the present invention. It is a rear view of the traveling body and turning body of the work vehicle shown in FIG. FIG. 3 is an enlarged right side view of an outrigger device on the right rear side of the work vehicle shown in FIG. 2. FIG. 4 is a diagram of a state seen from the IV direction in FIG. 3 with the vertical plate member on the rear side (left side in the drawing) shown in FIG. 3 removed; FIG. 5 is a diagram illustrating an outrigger drive control unit that drives and controls the outrigger member illustrated in FIG. 4 and a lock member drive control unit that drives and controls a movable lock member. It is a figure which shows each state of the outrigger drive control means and the lock member drive control means in the middle of the outrigger member shifting from the retracted posture to the ground posture. It is a figure which shows each state of an outrigger drive control means and a lock member drive control means when the shift to the grounding attitude | position of an outrigger member is completed. It is a figure which shows each state of an outrigger drive control means and a lock member drive control means when an outrigger member starts the transition from a contact posture to a retracted posture.

  An outrigger device for a work vehicle according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the work vehicle 1 according to the present embodiment includes a four-wheel wheel-type traveling body 2, a revolving body 3 that is disposed on the traveling body 2 and is coupled to the traveling body 2 so as to be capable of turning, And a working device 4 provided substantially in the center of the front portion of the revolving structure 3. The swivel body 3 has a cab 3 a on the left side of the working device 4. The cab 3a is coupled to the frame 3b of the revolving structure 3 via a link portion 3c that can extend upward. The link portion 3c extends upward so that the cab 3a can be arranged at a higher position than the position shown in FIG. The work device 4 is provided with a boom 4a that is pivotably coupled to the frame 3b of the revolving structure 3, an arm 4b that is pivotally coupled to one end of the boom 4a, and a pivot that is pivotable at one end of the arm 4b. Grapple bucket 4c.

  As shown in FIG. 2, an outrigger device 10 that is paired on the left and right is provided at the rear of the traveling body 2. Similarly, an outrigger device 10 that forms a pair on the left and right is provided at the front portion of the traveling body 2.

  The work vehicle 1 performs a work of loading scrap into a dump truck at a site where the scraps are piled up. In this loading operation, the grapple bucket 4c is placed on the upper part of the scrap pile while the work vehicle 1 is stopped near the scrap pile and the link portion 3c is extended upward and the cab 3a is positioned at a high position. This is an operation of repeating the procedure of moving, then grabbing the scrap, and then carrying and loading the grabbed scrap to the dump truck while rotating the swivel body 3. When causing the work vehicle 1 to perform such an operation, the work vehicle 1 is stabilized using the outrigger device 10 so that the work vehicle 1 does not fall down.

  The outrigger device 10 according to the present embodiment will be described by taking the outrigger device 10 on the right rear side of the work vehicle 1 shown in FIGS. 3 to 8 as an example.

  The outrigger device 10 is provided on the support portion 11 of the traveling body 2. As shown in FIG. 3, the support portion 11 is vertically opposed between the vertical plate members 12 and 13 positioned in the front-rear direction and the vertical plate members 12 and 13 as shown in FIG. The upper plate member 14 and the lower plate member 15 are fixed to the vertical plate members 12 and 13.

  An outrigger member 16 is rotatably supported between the right end portions of the vertical plate members 12 and 13. In FIG. 4, reference numeral 17 denotes a support shaft that forms a fulcrum of rotation of the outrigger member 16. The outrigger member 16 changes its posture by rotating, and is a posture that extends upward from the support shaft 17 side and is located within the vehicle width of the work vehicle 1 (the posture shown in FIGS. 1 to 5). ) And a ground contact posture (posture shown in FIGS. 7 and 8) projecting to the side of the work vehicle 1 and grounding. The change from the retracted posture to the grounding posture is due to the outrigger member 16 having the retracted posture rotating in a direction away from the support portion 11 (the direction of arrow A in FIG. 4).

  An outrigger float 18 is provided at the end of the outrigger member 16 located on the opposite side of the support shaft 17 so as to be rotatable in the direction of arrow C. In FIG. 4, reference numeral 19 denotes a support shaft that forms a rotation fulcrum of the outrigger float 18. The outrigger float 18 has a grounding plate 18 a at an end located on the side opposite to the support shaft 19. The outrigger float 18 changes its posture by its own weight as the outrigger member 16 rotates. The center of gravity of the outrigger float 18 is such that the support shaft 19 of the outrigger float 18 is at the same height as the support shaft 17 of the outrigger member 16. In the state where the outrigger member 16 is in a lower position, the grounding plate 18a is set so as to expand in a direction perpendicular to the gravity.

  The outrigger device 10 further includes outrigger drive control means 20 that drives and controls the outrigger member 16. The outrigger drive control means 20 has an outrigger cylinder 21 which is a single rod type hydraulic cylinder. The outrigger cylinder 21 is disposed between the vertical plate members 12 and 13. The cylinder tube 22 of the outrigger cylinder 21 is rotatably supported by the vertical plate members 12 and 13. The rod 23 of the outrigger cylinder 21 is rotatably supported by the outrigger member 16. In FIG. 4, reference numeral 24 denotes a support shaft that forms a rotation fulcrum of the cylinder tube 22, and 25 denotes a support shaft that forms a rotation fulcrum of the rod 23.

  As shown in FIG. 5, the outrigger drive control means 20 further includes a hydraulic oil tank 26 and a first hydraulic pump 27 that sucks up the hydraulic oil from the hydraulic oil tank 26 and discharges the pressure oil supplied to the outrigger cylinder 21. And.

  The outrigger drive control means 20 further includes an electrically operable directional control valve 28 interposed between the first hydraulic pump 27 and the outrigger cylinder 21. The directional control valve 28 is a spring return type three-position valve that operates by being selectively supplied with electric power to one of the first solenoid part 28a and the second solenoid part 28b. As the valve position of this directional control valve, the neutral position Na which is the normal position, the first switching position Sa1 which is switched when the power is supplied to the first solenoid part 28a, and the power is supplied to the second solenoid part 28b. A second switching position Sa2 that switches sometimes is set. The neutral position is a valve position that allows the first hydraulic pump 27 to communicate with the hydraulic oil tank 26. The first switching position Sa1 is a valve position where the port Pa on the bottom chamber side of the outrigger cylinder 21 is communicated with the first hydraulic pump 27 and the port Pb on the rod chamber side of the outrigger cylinder 21 is communicated with the hydraulic oil tank 26. The second switching position Sa2 is a valve position at which the rod chamber side port Pb of the outrigger cylinder 21 communicates with the first hydraulic pump 27 and the bottom chamber side port Pa of the outrigger cylinder 21 communicates with the hydraulic oil tank 26.

  The outrigger drive control means 20 further includes a controller 29 that controls the power supplied to the direction control valve 28. Although not shown, the controller 29 includes a CPU (Central Processing Unit), a predetermined control program and ROM (Read Only Memory) storing data, temporary storage of generated processing information, and deletion of stored information. And a directional control valve control means 29a for controlling the power supplied to the directional control valve 28 as a function set by the control program and data.

  A ground command switch 37 and a storage command switch 38 are electrically connected to the controller 29. The ground command switch 37 and the storage command switch 38 are self-returning push switches. The ground command switch 37 is turned on by a push operation, and sends a command signal (electric signal) corresponding to a command for changing the posture of the outrigger member 16 from the retracted posture to the ground posture to the controller 29, that is, the outrigger drive control means 20. This is a ground command means for outputting to the ground. The storage command switch 38 is turned on by a push operation, and sends a command signal (electrical signal) corresponding to a command for changing the attitude of the outrigger member 16 from the ground attitude to the stored attitude to the outrigger drive control means 20. That is, it is a storage command means that outputs the outrigger drive control means 20.

  When the command signal from the ground command switch 37 is input, the direction control valve control means 29a of the controller 29 supplies the direction control valve 28 with power for switching the valve position to the first switching position Sa1, that is, As shown in FIG. 6 with thick electric signal lines, it is set to supply power to the first solenoid unit 28a. Further, when the controller 29 inputs a command signal from the storage command switch 38, the controller 29 supplies the directional control valve 28 with power for switching the valve position to the second switching position Sa2, that is, the electric signal line in FIG. Is set so as to supply electric power to the second solenoid portion 28b.

  The outrigger drive control means 20 further includes a bottom chamber side operation check valve 30 and a rod chamber side operation check valve 31 between the direction control valve 28 and the outrigger cylinder 21. The bottom chamber side operation check valve 30 is interposed between the direction control valve 28 and the bottom chamber of the outrigger cylinder 21, and blocks the flow of pressure oil in the direction from the bottom chamber toward the direction control valve 28. The bottom chamber side operation check valve 30 is a hydraulic pilot type valve having a hydraulic pilot portion 30a. When a pilot pressure is applied to the hydraulic pilot portion 30a, the pressure oil in the direction from the bottom chamber toward the direction control valve 28 is reduced. The flow is allowed. The rod chamber side operation check valve 31 is interposed between the direction control valve 28 and the rod chamber 31a of the outrigger cylinder 21, and blocks the flow of pressure oil from the rod chamber 31a toward the direction control valve 28. The rod chamber side operation check valve 31 is a hydraulic pilot type valve having a hydraulic pilot portion 31a. When pilot pressure is applied to the hydraulic pilot portion 31a, the pressure oil in the direction from the rod chamber toward the direction control valve 28 is reduced. The flow is allowed.

  The outrigger drive control means 20 further includes a second hydraulic pump 32 that sucks up the hydraulic oil from the hydraulic oil tank 26 and discharges it to the pipe 33. From the pipeline 33, a pilot line 34 that guides pressure oil to the hydraulic pilot part 30a of the bottom chamber side operation check valve 30, and a pilot line 35 that guides pressure oil to the hydraulic pilot part 31a of the rod chamber side operation check valve 31; Is branched.

  The outrigger drive control means 20 is further provided in a switching valve 36 that can be electrically operated on the pipe 33. The switching valve 36 is a spring return type two-position valve that operates when electric power is supplied to the solenoid part 36a. The valve position of the switching valve 36 is from the initial position Nb at which the hydraulic pilot portion 30a of the bottom chamber side operation check valve 30 and the hydraulic pilot portion 31a of the rod chamber side operation check valve 31 are communicated with the hydraulic oil tank 26. It is set to be switchable to an operation position Sb that guides the oil discharged from the second hydraulic pump 32 to the parts 30a and 31a.

  The controller 29 further includes switching valve control means 29b for controlling the power supplied to the solenoid portion 36a of the switching valve 36 as a function set by the control program and data. The switching valve control means 29b is stored while the controller 29 continues to input the command signal from the ground command switch 37 as shown in FIG. 6 and FIG. While the command signal from the command switch 38 is continuously input, power is supplied to the solenoid portion 36a of the switching valve 36 ().

  The outrigger device 10 further includes a lock means 40. As shown in FIG. 4, the lock means 40 is provided on the movable lock member 41 slidably inserted into the guide tube 49 and the outrigger member 16, and is movable when the outrigger member 16 is in the retracted position. And an abutting plate 42 that protrudes below the member 41.

  The lock unit 40 further includes a lock member drive control unit 45 that drives and controls the movable lock member. The lock member drive control means 45 has a lock cylinder 44 (hydraulic cylinder) provided on the upper plate member 14. The lock cylinder 44 is a single rod type hydraulic cylinder, and is fixed to the upper plate member 14 in such a posture that the rod 46 faces the outrigger member 16 side. The guide tube 49 is provided on the cylinder tube 44a. The movable lock member 41 is provided at a portion of the rod 46 protruding from the cylinder tube 44 a of the lock cylinder 44. When the rod 46 slides with respect to the cylinder tube 45, the movable lock member 41 moves between the lock position (position shown in FIG. 5) and the release position (position shown in FIG. 6).

  A spring 47 (coil spring) is provided in the bottom chamber 44 a of the lock cylinder 44. The spring 47 generates an urging force in a direction in which the rod 46 is pushed out from the cylinder tube 45. Since the movable lock member 41 is provided on the rod 46, the movable lock member 41 is biased toward the lock position by the spring 47 via the rod 46. That is, the spring 47 is a biasing unit that biases the movable lock member 41 and defines the initial position of the movable lock member 41 as the lock position.

  The lock member drive control means 45 is a controller as the second hydraulic pump 32, the changeover valve 36, and the changeover valve control means 29b for controlling the power supplied to the changeover valve 36 with the outrigger drive control means 20. 29 is shared.

  In the lock member drive control means 45, the second hydraulic pump 32 discharges pressure oil for driving the lock cylinder 44. A drive pipe 48 is branched from the upstream of the pilot lines 34 and 35 and downstream of the switching valve 36 and is connected to the rod chamber 44 b of the lock cylinder 44. Thereby, when the valve position of the switching valve 36 is switched to the operating position Sb, the discharge oil of the second hydraulic pump 32 is supplied to the rod chamber 44 b of the lock cylinder 44 and the rod 46 is driven against the spring 47. become. In the lock member drive control means 45, the initial position Nb of the switching valve 36 is a valve position for communicating the rod chamber 44b with the hydraulic oil tank 26, and the operating position Sb is the discharge oil of the second hydraulic pump 32 to the rod chamber. This is the valve position leading to 44b.

  The outrigger device 10 configured as described above operates as follows ((1)) and ((2)).

(1) First, the operation when the posture of the outrigger member 16 is changed from the retracted posture to the ground posture will be described.

  When the posture of the outrigger member 16 is changed from the retracted posture to the ground posture, the operator pushes the ground command switch 37. By this push operation, a command signal is given from the ground command switch 37 to the controller 29. At this time, in the lock member drive control means 45, electric power is supplied to the solenoid portion 36a of the switching valve 36 by the switching valve control means 29b of the controller 29, whereby the valve position of the switching valve 36 is changed from the initial position Nb to the operating position Sb. Switch to Accordingly, the oil discharged from the second hydraulic pump 32 flows into the rod chamber 44 b of the lock cylinder 44 through the switching valve 36 and the drive pipe 48, and the rod 46 is drawn into the cylinder tube 45 against the spring 47. As a result, the movable lock member 41 moves from the lock position to the release position. Thereby, the contact plate 42 provided on the outrigger member 16 is released from the locked state by the movable lock member 41. That is, the outrigger member 16 is permitted to rotate so as to project to the side of the work vehicle 1, that is, the unlocked state.

  In the outrigger drive control means 20, electric power is supplied to the solenoid portion 36 a of the switching valve 36 by the switching valve control means 29 b of the controller 29 that has received a command signal from the ground command switch 37, whereby the valve position of the switching valve 36 is changed. When the operating position Sb is switched, the oil discharged from the second hydraulic pump 32 is supplied to the hydraulic pilot portion 30a of the bottom chamber side operation check valve 30 and the hydraulic pilot portion of the rod chamber side operation check valve 31 through the pilot lines 34 and 35, respectively. It is supplied to each of 31a. As a result, the flow of pressure oil in the direction from the rod chamber of the outrigger cylinder 21 toward the direction control valve 28 is permitted, that is, the flow of pressure oil in the direction from the rod chamber toward the hydraulic oil tank 26 is permitted. Become.

  In the outrigger drive control means 20, the direction control valve control means 29 a of the controller 29 controls the direction in parallel with the power supply to the solenoid portion 36 a of the changeover valve 36 by the switching valve control means 29 b of the controller 29 as described above. Electric power is supplied to the first solenoid part 28 a of the valve 28. As a result, the valve position of the direction control valve 28 is switched from the neutral position Na to the first switching position Sa1, and the discharged oil of the first hydraulic pump 27 flows into the bottom chamber of the outrigger cylinder 21 through the direction control valve 28. That is, the outrigger member 16 tends to rotate in the direction projecting to the side of the work vehicle 1 (the direction of arrow A in FIG. 6).

  Now, the rod chamber side operation check valve 31 in the outrigger drive control means 20 is in a state in which the flow of pressure oil from the rod chamber of the outrigger cylinder 21 toward the hydraulic oil tank 26 is permitted. Furthermore, the outrigger member 16 is in a unlocked state. Therefore, the rod 23 of the outrigger cylinder 21 is pushed out of the cylinder tube 22 by the pressure oil flowing into the bottom chamber from the first hydraulic pump 27 while pushing the pressure oil in the rod chamber to the hydraulic oil tank 26 into the bottom chamber. Accordingly, the outrigger member 16 starts to move in the direction projecting to the side of the work vehicle 1 (the direction of arrow A in FIG. 6).

  By continuing to press the ground command switch 37, the operator allows the outrigger drive control means 20 to permit the flow of pressure oil from the rod chamber 21a of the outrigger cylinder 21 toward the hydraulic oil tank 26, and the outrigger member 16 is unlocked. The outrigger device 10 is made to continue this state, and the outrigger cylinder 21 changes the attitude of the outrigger member 16 from the retracted attitude to the ground attitude.

  After confirming that the outrigger member 16 is in the grounding posture, the operator stops the push operation of the grounding command switch 37. Accordingly, the command signal is not given from the ground command switch 37 to the controller 29. At this time, in the outrigger drive control means 20, the controller 29 as the switching valve control means 29b stops the supply of electric power to the solenoid portion 36a of the switching valve 36, whereby the valve position of the switching valve 36 is initialized from the operating position Sb. Self-return to position Nb. Therefore, the oil discharged from the second hydraulic pump 32 is not supplied to the hydraulic pilot part 30a of the bottom chamber side operation check valve 30 and to the hydraulic pilot part 31a of the rod chamber side operation check valve 31, and the hydraulic pilot part 30a. , 31 a is released to the hydraulic oil tank 26 through the switching valve 36. As a result, the flow of pressure oil in the direction from the bottom chamber of the outrigger cylinder 21 to the direction control valve 28 and the flow of pressure oil in the direction from the rod chamber to the direction control valve 28 are blocked. That is, the pressure in the bottom chamber and the pressure in the rod chamber are maintained. As a result, the outrigger member 16 is held in the grounding posture.

(2) Next, the operation when the posture of the outrigger member 16 is changed from the ground contact posture to the retracted posture will be described.

  When changing the outrigger member 16 from the ground posture to the retracted posture, the operator pushes the retract command switch 38. By this push operation, a command signal is given from the storage command switch 38 to the controller 29. At this time, in the lock member drive control means 45, electric power is supplied to the solenoid portion 36a of the switching valve 36 by the switching valve control means 29b of the controller 29, whereby the valve position of the switching valve 36 is changed from the initial position Nb to the operating position Sb. Switch to Accordingly, the oil discharged from the second hydraulic pump 32 flows into the rod chamber 44 b of the lock cylinder 44 through the switching valve 36 and the drive pipe 48, and the rod 46 is drawn into the cylinder tube 45 against the spring 47. As a result, the movable lock member 41 moves from the lock position to the release position. Thereby, the contact plate 42 provided on the outrigger member 16 is released from the locked state by the movable lock member 41. That is, the outrigger member 16 is permitted to rotate so as to project to the side of the work vehicle 1, that is, the unlocked state.

  In the outrigger drive control means 20, electric power is supplied to the solenoid portion 36 a of the switching valve 36 by the switching valve control means 29 b of the controller 29 that has received a command signal from the storage command switch 38, whereby the valve position of the switching valve 36 is changed. When the operating position Sb is switched, the oil discharged from the second hydraulic pump 32 is supplied to the hydraulic pilot portion 30a of the bottom chamber side operation check valve 30 and the hydraulic pilot portion of the rod chamber side operation check valve 31 through the pilot lines 34 and 35, respectively. It is supplied to each of 31a. As a result, the flow of pressure oil in the direction from the rod chamber of the outrigger cylinder 21 toward the direction control valve 28 is permitted, that is, the flow of pressure oil in the direction from the rod chamber toward the hydraulic oil tank 26 is permitted. Become. The operation so far is the same as the operation described in “(1)”. The next operation is different from the operation described in “(1)”.

  In the outrigger drive control means 20, this time, by the directional control valve control means 29 a of the controller 29 this time, in parallel with the supply of power to the solenoid portion 36 of the changeover valve 36 by the switching valve control means 29 b of the controller 29 as described above. Electric power is supplied to the second solenoid portion 28 b of the direction control valve 28. As a result, the valve position of the direction control valve 28 is switched from the neutral position Na to the second switching position Sa2, and the discharged oil of the first hydraulic pump 27 flows into the rod chamber of the outrigger cylinder 21 through the direction control valve 28. That is, the outrigger member 16 tends to rotate in the direction of jumping toward the work vehicle 1 (the direction of arrow B in FIG. 8).

  Now, the bottom chamber side operation check valve 30 in the outrigger drive control means 20 is in a state in which the flow of pressure oil from the bottom chamber of the outrigger cylinder 21 toward the hydraulic oil tank 26 is permitted. Accordingly, the rod 23 of the outrigger cylinder 21 is drawn into the cylinder tube 22 by the pressure oil flowing into the rod chamber from the first hydraulic pump 27 while pushing the pressure oil in the bottom chamber toward the hydraulic oil tank 26. Accordingly, the operation in the direction in which the outrigger member 16 jumps to the work vehicle 1 side (the direction of arrow B in FIG. 8) is started.

  The operator keeps pressing the storage command switch 38, so that the outrigger drive control means 20 permits the flow of pressure oil from the bottom chamber of the outrigger cylinder 21 to the hydraulic oil tank 26, and the lock of the outrigger member 16 is released. The outrigger device 10 is continued to change the attitude of the outrigger member 16 from the ground attitude to the retracted attitude.

  After confirming that the attitude of the outrigger member 16 is in the retracted position, the operator stops the push operation of the retract command switch 38. Accordingly, a command signal is not given from the storage command switch 38 to the controller 29. At this time, in the outrigger drive control means 20, the switching valve control means 29b of the controller 29 stops supplying electric power to the solenoid portion 36a of the switching valve 36, whereby the valve position of the switching valve 36 is changed from the operating position Sb to the initial position. Self-reset to Nb. Therefore, the oil discharged from the second hydraulic pump 32 is not supplied to the hydraulic pilot part 30a of the bottom chamber side operation check valve 30 and to the hydraulic pilot part 31a of the rod chamber side operation check valve 31, and the hydraulic pilot part 30a. , 31 a is released to the hydraulic oil tank 26 through the switching valve 36. As a result, the flow of pressure oil in the direction from the bottom chamber of the outrigger cylinder 21 to the direction control valve 28 and the flow of pressure oil in the direction from the rod chamber to the direction control valve 28 are blocked. That is, the pressure in the bottom chamber and the pressure in the rod chamber are maintained. As a result, the outrigger member 16 is held in the retracted posture.

  Further, in the lock member drive control means 45, the switching valve control means 29b of the controller 29 stops the supply of electric power to the solenoid portion 36a of the switching valve 36, and the valve position of the switching valve 36 is changed from the operating position Sb to the initial position Nb. Along with the self-return, the rod chamber 44b of the lock cylinder 44 communicates with the hydraulic oil tank 26 via the switching valve 36. As a result, the rod 46 is pushed out of the cylinder tube 45 by the spring 47 while pushing the pressure oil in the rod chamber 44b toward the hydraulic oil tank 26, and accordingly, the movable lock member 41 moves from the release position to the lock position. As a result, the movable lock member 41 protrudes above the contact plate 42 and locks the contact plate 42. That is, the outrigger member 16 in the retracted position is locked.

  According to the outrigger device 10 according to the present embodiment, the following effects can be obtained.

  In the outrigger device 10, the lock means 40 operates when the posture of the outrigger member 16 is changed from the retracted posture to the ground posture and when the outrigger member 16 is changed from the ground posture to the retracted posture. Thereby, it is possible to prevent the outrigger member 16 in the retracted position from being forgotten to be locked and forgotten to be unlocked. Therefore, it is possible to prevent the work vehicle from traveling in a state where it has been forgotten to be locked, and it is possible to prevent damage to the outrigger device caused by operating the outrigger member in a state where it has been forgotten to be unlocked.

  In the above-described embodiment, the switching valve 36 is shared between the outrigger drive control means 20 and the lock member drive control means 45, which can simplify the hydraulic circuit of the outrigger device 10, The present invention is not limited to this. That is, the switching valve may be provided separately for the outrigger drive control means 20 and the lock member drive control means 45. In this case, the switching valve for the outrigger drive control hand is provided downstream of the drive pipe line 48 on the pipe line 33, and the switch valve for the lock member drive control means is provided on the drive pipe line 48. In this configuration, when changing the attitude of the outrigger member 16 from the retracted attitude to the ground attitude, both of the two switching valves are operated, and when changing the attitude of the outrigger member 16 from the ground attitude to the retracted attitude, 2 Of the two switching valves, the controller 29 may be provided with switching valve control means for operating only the switching valve for outrigger drive control. That is, when the attitude of the outrigger member 16 is changed from the ground attitude to the retracted attitude, it is not necessary to operate the switching valve for the lock member drive control means. The reason is as follows.

  When the lock drive control switching valve is in the initial position, the rod chamber 44b of the lock cylinder 44 communicates with the hydraulic oil tank 26 via the switch valve, so that the movable lock member is held in the lock position by the spring 47. Has been. Therefore, the abutment plate 42 contacts the movable lock member 41 while the outrigger member 16 rotates in the direction of the work vehicle 1. Thereafter, the abutting plate 42 rotates in the direction of the work vehicle 1 together with the outrigger member 16 while moving the movable lock member 41 against the spring 47 in the direction of the release position. When the outrigger member 16 is in the retracted position, the contact plate 42 is disengaged downward with respect to the movable lock member 41. Along with this, the movable lock member 41 is returned to the locked position by the spring 47, whereby the contact plate 42 is locked by the movable lock member 41. That is, the outrigger member 16 is locked in the retracted state. Therefore, when changing the attitude of the outrigger member 16 from the ground attitude to the retracted attitude, it is necessary to operate only the switching valve for the outrigger drive control out of the two switching valves and to operate the switching valve for the lock member drive control means. There is no.

DESCRIPTION OF SYMBOLS 1 Work vehicle 10 Outrigger apparatus 11 Support part 16 Outrigger member 20 Outrigger drive control means 21 Outrigger cylinder 22 Cylinder tube 23 Rod 26 Hydraulic oil tank 27 First hydraulic pump 28 Direction control valve 28a First solenoid part 28b Second solenoid part 29 Controller 29a Direction control valve control means 29b Switching valve control means 30 Bottom chamber side operation check valve 30a Hydraulic pilot section 31 Rod chamber side operation check valve 31a Hydraulic pilot section 32 Second hydraulic pump 33 Pipe lines 34, 35 Pilot line 36 Switching valve 36a Solenoid part 37 Grounding command switch 38 Storage command switch 40 Locking means 41 Movable lock member 42 Abutting plate 43 Locking member drive control means 44 Lock cylinder 46 Rod 47 Spring 48 Drive line

Claims (3)

An outrigger member rotatably provided on a support portion fixed to the work vehicle and capable of changing between a retracted position positioned within a vehicle width of the work vehicle and a grounding position projecting to the side of the work vehicle and grounding; An outrigger drive control means for driving and controlling the outrigger member; a grounding instruction means for outputting a command for changing the attitude of the outrigger member from a retracted attitude to a grounding attitude; and the outrigger drive control means. An outrigger device for a work vehicle comprising: a storage command means for outputting a command for changing the attitude of the outrigger member from a grounding attitude to a retracted attitude; and a lock means for locking the outrigger member in the retracted attitude.
The locking means is
A movable lock member provided in the support portion and movable between a lock position and a release position;
A biasing means for biasing the movable lock member to define the initial position of the movable lock member as a lock position;
Lock member drive control means for holding the movable lock member at the release position against the biasing force of the biasing means while the command is continuously output from the grounding command means to the outrigger drive control means;
A contact plate that is provided on the outrigger member and contacts the movable lock member positioned at the lock position to lock the outrigger member in a state where the outrigger member is in a retracted posture; An outrigger device for a working vehicle. The outrigger device for a work vehicle according to claim 1,
The lock member drive control means includes a lock cylinder that is a single rod type hydraulic cylinder, a hydraulic pump that discharges pressure oil supplied to the lock cylinder, and a switching valve that is interposed between the hydraulic pump and the lock cylinder. And switching valve control means for controlling the switching valve,
The movable lock member is provided on a portion of the rod protruding from the cylinder tube of the lock cylinder,
The biasing means is a spring that is provided in a bottom chamber of the lock cylinder and generates a biasing force in a direction of pushing out the rod from the cylinder tube.
The switching valve is a self-returning valve, and the valve position of the switching valve can be switched from an initial position where the rod chamber communicates with the hydraulic oil tank to an operating position where the discharge oil of the hydraulic pump is guided to the rod chamber Is set to
The switching valve control means is set to hold the switching valve in the operating position while a command signal is continuously output from the ground command means to the outrigger drive control means. Vehicle outrigger device. The outrigger device for a work vehicle according to claim 1,
The outrigger drive control means includes an outrigger cylinder that is a one-rod hydraulic cylinder in which a cylinder tube is rotatably supported by the support portion and a rod is rotatably supported by the outrigger member; and the outrigger cylinder A first hydraulic pump for discharging the supplied pressure oil, a directional control valve interposed between the first hydraulic pump and the outrigger cylinder, and a directional switching valve control means for controlling the directional control valve,
The direction control valve is a self-returning three-position valve. As a valve position of the direction control valve, a neutral position for communicating the first hydraulic pump with a hydraulic oil tank, and a port on the bottom chamber side of the outrigger cylinder are provided. A first switching position that communicates with the first hydraulic pump and communicates a port on the rod chamber side of the outrigger cylinder with the hydraulic oil tank; and a port on the rod chamber side of the outrigger cylinder communicates with the first hydraulic pump. A second switching position for communicating the bottom chamber side port of the outrigger cylinder with the hydraulic oil tank,
The direction switching valve control means controls the direction control valve so that its valve position is switched to the first switching position while the outrigger drive control means continues to receive the command from the ground command means. , While the outrigger drive control means continues to receive a command from the storage command means, the directional control valve is controlled so that its valve position is switched to the second switching position,
Between the directional control valve and the bottom chamber of the outrigger cylinder, there is provided a hydraulic pilot type bottom chamber side operation check valve that blocks the flow of pressure oil from the bottom chamber toward the directional control valve. A hydraulic pilot type rod chamber side operation check valve is provided between the direction control valve and the rod chamber of the outrigger cylinder to block the flow of pressure oil from the rod chamber toward the direction control valve. And
The lock member drive control means includes a lock cylinder that is a single rod type hydraulic cylinder, and a second hydraulic pump that is different from the first hydraulic pump that discharges pressure oil supplied to the lock cylinder,
The movable lock member is provided on a portion of the rod protruding from the cylinder tube of the lock cylinder,
The biasing means is a spring that is provided in a bottom chamber of the lock cylinder and generates a biasing force in a direction of pushing out the rod from the cylinder tube.
A pipe line through which the second hydraulic pump discharges pressure oil is provided with branching pilot lines for introducing pilot pressure to the bottom chamber side operation check valve and the rod chamber side operation check valve, A drive pipe that leads pressure oil to the rod chamber of the lock cylinder is branched upstream of the two pilot lines on the pipe, and a switching valve is provided upstream of the drive pipe on the pipe. Is provided,
The switching valve is a self-returning valve, and the valve position of the switching valve is an operating position for guiding the discharge oil of the second hydraulic pump to the rod chamber from an initial position where the rod chamber communicates with the hydraulic oil tank. Is set to be switchable,
The outrigger drive control means and the lock member drive control means share a switch valve control means for controlling the switch valve, and the switch valve control means outputs a command from the ground command means to the outrigger drive control means. An outrigger device for a work vehicle, which is set to hold the switching valve in the operating position while the operation is continued.

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