JPH1036100A - Operation controller of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation controller of a working vehicle which can prevent the failure to extend a jack when operating a working vehicle. SOLUTION: Limit switches 26, 27, connected to a solenoid valve which switches an oil passage from the jack side to the working device side when turned on, are provided at the lower end of the outer 21 of a jack 20. One limit switch 26 is turned on as a roller 26b at the end of a button 26a falls when a notch 22a in the upper end of an inner 22 causes expansion of the jack by the predetermined stroke required to keep tires 3 away from the ground. The other limit switch 27 is turned on as its upper end presses in a button 27a by rocking toward the inside of a body because of the presence of play between the outer 21 and the inner 22, when the inner 22 is grounded and exerted with a reaction force from the surface of the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working vehicle having a working device on a vehicle body and a jack for stably supporting the vehicle body, and furthermore, to prevent forgetting to tighten the jack when operating the working device. Operation control device for a working vehicle.

[0002]

2. Description of the Related Art As a work vehicle equipped with a work device on a vehicle body, there is an aerial work vehicle in which a boom that can be extended and retracted and undulated is pivotally supported on the vehicle body. In this type of aerial work vehicle, an aerial work can be performed by operating a boom to move, for example, a work table provided at a distal end to a desired position. On the other hand, such a boom operation may cause the center of gravity of the vehicle to move and the vehicle to become unstable. Therefore, the work vehicle is provided with a jack for supporting the vehicle body during work and stabilizing the vehicle.

[0003]

However, since the operation of the boom can be performed even when the jack is forgotten, the vehicle becomes unstable when the jack is forgotten and the boom is operated. There was a problem of danger.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a work vehicle operation control device for preventing a jack from being forgotten when operating a work device.

[0005]

In order to achieve the above object, an operation control device for a working vehicle according to the present invention comprises a movable vehicle body and a working device disposed on the vehicle body. And a telescopic jack which is provided on the vehicle body so as to be able to expand and contract downward, and which is grounded to support the vehicle body.

[0006] The operation control device is characterized in that control means for restricting the operation of the working device is provided until the jack extends for a predetermined stroke or more. In particular,
The predetermined stroke of the jack is a stroke necessary to stabilize the vehicle body, to set off the vehicle body as a necessary stroke, and to set the stroke width of the jack to a predetermined amount or more,
Further, the control means includes a solenoid valve for switching an oil passage between the working device side and the jack side, and a limit switch connected to the solenoid valve and operated when the jack is extended by a predetermined stroke amount. This can be achieved by setting the road so as to switch to the working device side. According to the operation control device for a work vehicle having such a configuration, it is possible to prevent the work device from being operated by forgetting to put on the jack.

It is to be noted that a grounding detector for detecting the grounding of the jack due to the expansion of the jack is provided, and the operation of the working device is restricted until the jack is extended for a predetermined stroke or more and the grounding of the jack is detected. preferable. With this configuration, when jacking on uneven road surfaces,
If there is a jack that is not grounded even if it has been extended beyond a predetermined stroke, the operation of the working device cannot be performed. Therefore, the work cannot be performed unless the jack that is not grounded is further extended and grounded, and the safety of the work is further improved.

Further, one limit switch is provided which operates in response to the extension operation of the jack beyond a predetermined stroke and the movement of the jack due to the ground reaction force, and regulates the operation of the working device until the limit switch is operated. It may be. According to such a configuration, the extension of the jack and the detection of the grounding can be performed with only one limit switch, and the configuration can be simplified.

According to a fourth aspect of the present invention, there is provided an operation control device for a working vehicle, comprising: a vehicle capable of traveling; a working device disposed on the vehicle; The present invention is used for a work vehicle provided with a swing type jack that is swingably provided and supports a vehicle body by touching the ground.

[0010] The operation control device is characterized in that control means for regulating the operation of the working device is provided until the jack swings downward by a predetermined swing amount or more. Specifically, the predetermined swing amount of the jack is set as the swing amount necessary for stabilizing the vehicle body and the swing amount for ground-cutting the vehicle body, and the control means switches the oil passage between the working device side and the jack side. This can be achieved by providing a solenoid valve and a limit switch that is connected to the solenoid valve and that operates when the jack swings by a predetermined swing amount, and that the oil passage is switched to the working device side by the operation of the limit switch. . According to the operation control device for a work vehicle having such a configuration, it is possible to prevent the work device from being operated by forgetting to put on the jack.

In addition, a grounding detector for detecting the grounding of the jack due to the rocking of the jack is provided, and the operation of the working device is restricted until the jack rocks by a predetermined rocking amount or more and the grounding of the jack is detected. Is preferred. With this configuration, the working device cannot be operated in a state where there is a jack that is not grounded even if the jack rocks over a predetermined rocking amount, such as when the jack is set on an uneven road surface. For this reason, the work cannot be performed until the jack that is not grounded is further swung and installed, and the safety of the work is further improved.

Further, a single limit switch is provided which operates in response to the swinging motion of the jack exceeding a predetermined swinging amount and the movement of the jack due to the ground reaction force, and regulates the operation of the working device until the limit switch is operated. You may make it. According to such a configuration, it is possible to detect the rocking and grounding of the jack with only one limit switch,
The structure can be simplified.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, an aerial work vehicle equipped with a work vehicle operation control device according to the present invention will be described with reference to FIGS. The aerial work vehicle 1 is manufactured based on a truck, and the vehicle body 2 has tires 3. A swivel 4 is provided on the vehicle body 2, and a swivel bracket 4 a is fixed to the swivel 4. A boom 5 is pivotally supported on the swivel bracket 4a by an up-and-down cylinder 6 so that the boom 5 can be swung up and down by a swivel motor (not shown) while the boom 5 is pivotally supported. Has become.

The boom 5 includes a starting boom 5a, an intermediate boom 5b, and a tip boom 5c. These three-stage booms are telescopically configured to be telescopic and can be telescopically operated by telescopic cylinders (not shown). ing. A vertical post 7 which is always vertically held by a leveling mechanism is provided at the distal end of the distal end boom 5c, and a worktable 8 for mounting an operator on the vertical post 7 is pivotally supported pivotally.

In the aerial work vehicle constructed as described above, the person riding on the work table 8 can be moved to a desired aerial position to perform work by turning and expanding / contracting the boom 5. it can. Since the center of gravity of the entire work vehicle 1 moves and becomes unstable when the boom 5 is operated in this manner, a total of four jacks 20 are provided on the front, rear, left and right sides of the vehicle body 2 for supporting the work vehicle 1 by touching the ground. Provided. This jack 2
Reference numeral 0 denotes a diagonally overhanging telescopic jack, which is stored when the boom 5 is not operated, such as during running, as shown in FIG.

FIG. 1B shows the internal structure of the jack 20 in the state shown in FIG. 1A, and the structure of the jack 20 will be described below with reference to FIG. In the jack 20, an inner member 22 is arranged to be able to expand and contract inside an outer member 21 formed in a hollow prism, and a jack cylinder 23 is arranged inside the inner member 22. The jack cylinder 23 includes a cylinder tube 23 a and a rod 23 b, and the tip of the rod 23 b is supported by the upper end of the inner member 22. The inner member 22 is extendable with respect to the outer member 21 by the jack cylinder 23.

The inner surface of the outer member 21 and the inner member 2
A predetermined amount of play (clearance) is provided between the outer surface of the inner member 2 and the inner surface of the outer member 21 to allow the inner member 22 to move within the outer member 21. Due to the presence of this play,
Inner member 2 suspended by jack cylinder 23
In the storage state 2, the lower portion contacts the lower end 21c on the inner end side of the outer member 21 and the upper end contacts the inner surface on the outer end side. The figure shows this play exaggeratedly.

In the vicinity of the lower end of the outer member 21, through holes 21a and 21b are formed. The inner member 22 is turned off when the inner member 22 extends beyond the stroke that causes the tire 3 to be grounded and the jack to have a predetermined width or more at a position where the through hole 21a on the outer end side is formed of the two holes. An actuating limit switch 26 is arranged. The limit switch 26 has a button 26 having a roller 26b.
The button 26a is provided, and the button 26a is urged to abut on the outer surface of the inner member 22 via the through hole 21a. The limit switch 26 is turned on when the button 26a projects beyond a predetermined amount.

At the upper end of the inner member 22,
A notch 22a is formed. This notch 22a is
The button 26a is formed so as to be in a position where the button 26a falls when the inner member 22 extends to a position where the tire 3 is ground-cut, and the notch depth is such that the amount of protrusion of the button 26a turns on the limit switch 26. Is set to be sufficient.

On the other hand, a limit switch 27 for detecting the grounding of the jack by a change in the amount of play between the outer member 21 and the inner member 22 is disposed outside the through hole 21b on the inner end side. The limit switch 27 is also provided with a button 27a having a roller 27b, and this button 27a is urged to abut on the outer surface of the inner member 22 via the through hole 21b. Limit switch 2
The switch 7 is turned on when the amount of protrusion of the button 27a becomes equal to or less than a predetermined amount.

Next, the operation of the limit switches 26 and 27 will be described with reference to FIGS. As shown in FIG. 3 (A), when the inner member 22 comes into contact with the ground and receives a ground reaction force from the ground, the lower part of the inner member 22 becomes the outer member 21 as shown in FIG. 3 (B). And receives a force from the lower end 21 </ b> D on the outer end side of the vehicle body 1 to swing inward of the vehicle body 1. And the tip is the limit switch 27
Button 27a is pressed, and the limit switch 27 is turned on.

Further, the jack 20 is extended, and FIG.
As shown in FIG. 3A, when the tension of the jack is equal to or more than a predetermined amount and the tire 3 is in a state of being separated, the inner member 22 is further extended than the state of FIG. The start end of the notch 22a is the position of the button 26a of the limit switch 26 as shown in FIG. For this reason, the roller 26b falls into the notch 22a, and the button 26 (A) button 26a projects to
6 is turned on.

Next, an outline of a hydraulic circuit of the vehicle 1 to which the limit switches 26 and 27 are connected will be described with reference to FIG. Oil pump 4 connected to oil tank 40
1 is connected to the solenoid valve 42. The solenoid valve 42 connects the oil passage of the oil from the oil pump 41 to the boom operation valve 43 and the jack operation valve 44.
This is a switching valve that switches to the side. The boom operation valve 43 operates a control valve of an actuator group 47 for operating a boom including a swing cylinder 45, an up-and-down cylinder 6, an extendable cylinder 46, and the like. On the other hand, the jack operation valve 44 operates a control valve of the jack cylinder 23.

The solenoid valve 42 is connected to a power supply 48. When the power supply is turned off, the solenoid valve 42 is biased by a spring 49 and moves leftward. Then, between the power supply 48 and the solenoid valve 42, the aforementioned limit switch 2
A total of eight, 6, 4, 27 in front, back, left, and right, respectively, are connected in series. These limit switches 26, 2
When all the switches 7 are turned on, the solenoid valve 42 moves rightward, the oil passage is switched to the boom operation valve 43 side, and the actuator group 47 can be operated using the boom operation valve 43. . The arrangement of these limit switches 26 and 27 can be set arbitrarily.

According to the operation control device for a working vehicle constructed as described above, all of the front, rear, left and right jacks 20 are connected to the vehicle body 1.
The boom 5 cannot be operated unless the tire is extended beyond a predetermined stroke necessary to ground-disconnect the tire and is not grounded at this time. Therefore, it is possible to prevent the user from operating the boom 5 due to forgetting to put the jack 20 on.

Next, the inner and outer limit switches 2
FIG. 6 shows a second example of the embodiment in which
This will be described with reference to FIG. In the second example, the outer member 51
A through-hole 51a is formed only inside the lower end of the inner member 52, and the inner member 52 extends at a position where the through-hole 51a is formed at a position where the tire 3 is grounded and a stroke for adjusting the width of the jack to a predetermined amount or more. And the limit switch 57 which is turned on only when it is grounded at this time.
Is arranged. The limit switch 57 is provided with a button 57a having a roller 57b.
7a is urged so as to contact the outer surface of the inner member 52 via the through hole 51a. At the upper end of the inner member 52, a flat plate 52a is provided. When the inner member 52 extends beyond a stroke which causes the tire 3 to break off the ground and a tension width of the jack to be a predetermined amount or more, the flat plate 52a is Switch 57 at the lower end
Roller 57b is disposed at a position where the roller 57b rides.

That is, FIG. 6 before the jack is extended.
When the inner member 52 is extended from the state shown in FIG. 6A by a stroke that causes the tire 3 to be ground and the tension of the jack to be a predetermined amount or more, as shown in FIG. Get on 52a and press button 57
a is pushed in. At this time, if the jack is in contact with the ground, the inner member 52 receives a force from the lower end 51d on the outer side of the outer member 51 and swings inward in the vehicle body 1, and the flat plate 52a is pressed by the button 57a of the limit switch 57.
Press further. The limit switch 57 is set to be turned on when the pushing amount is reached. According to the second example, the limit switch is set to 1
The extension of the jack and the detection of the grounding can be detected with only the limit switches, and the configuration can be simplified.

Next, a third example of the embodiment in which a swing type jack is used as a jack will be described with reference to FIG. In the swing type jack 70, a hole 75 a at the end of a swing arm 75 is supported by a swing arm shaft 74 provided at an end 73 of a vehicle body 72. A hole 77 c formed at an end of a cylinder tube 77 a of the jack cylinder 77 is pivotally supported on a jack cylinder shaft 76 provided above the swing arm shaft 74.
A rod 77b is provided in the cylinder tube 77a so as to be extendable and retractable, and the tip of the rod 77b is pivotally supported by a pin 75b at the lower end of the swing arm 75.
The swing arm 75 can be swung up and down by the expansion and contraction operation of b.

Swing arm shaft 74 and swing arm 7
A predetermined amount of play (clearance) t1 for fitting is generated between the hole 75a at the end of the fifth member 5 and the hole 75a. FIG.
When the swing arm 75 is not on the ground as shown in FIG.
Is suspended from the swing arm shaft 74,
The play t1 occurs below the swing arm shaft 74.

A limit switch 86 is disposed beside the swing arm 75 to detect that the swing arm 75 has swung more than a swing amount required to ground the tire. The limit switch 86 is provided with a bracket. 9
0 to the end 73 of the vehicle body 72. This limit switch 86 also has a button 86 having a roller 86b.
a is provided, and this button 86a is
Are biased so as to abut against the side portions. This button 8
6a is designed to be pushed in as the swing arm 75 swings downward, and is turned on by a pushing amount corresponding to the swing amount that causes the tire to ground.

Also, at the upper end of the swing arm 75,
A limit switch 87 is provided for detecting the jack contact by changing the amount of play between the swing arm shaft 74 and the hole 75a at the end of the swing arm 75. This limit switch 87 is also provided with a button 87a having a roller 87b.
Is provided. This button 87a is a swing arm 75
The swing arm 75 is pushed when the swing arm 75 touches the ground, and is pushed in when the swing arm 75 touches the ground.
7 is turned on.

That is, as shown in FIG.
When the swing arm 75 touches the ground and receives a ground reaction force, the vehicle body is supported by the jack 70, and the swing arm shaft 74 is supported by the hole 75 a at the end of the swing arm 75. Accordingly, the swing arm shaft 7
The rattle t1 generated on the lower side of No. 4 is clogged, and this rattle t1
Swing arm 75 is equal to the swing arm shaft 7
It is shifted upward with respect to 4. Accordingly, the button 87a is depressed by the shifted amount, and the limit switch 87 is turned on.

In the third example, a limit switch 86 is provided on the swing arm 75 for detecting that the tire has swung more than the swing amount necessary to ground the tire, and the ground contact of the jack is detected by a change in the amount of play. Limit switch 87
The limit switches 86 and 87 are also provided on the side of the swing arm 75, but may be provided on the side of the cylinder tube 77a so as to detect the play and the swing amount. .

In the fourth example shown in FIG. 8, a limit switch 86 is provided on the swing arm 75 side via a bracket 90 for detecting that the tire has swung more than the swing amount necessary to ground the tire. The limit switch 87 for detecting the grounding of the jack by the change in the amount is mounted on the bracket 9.
1 is provided on the cylinder tube 77a side. In the fourth example, the backlash t2 between the hole 77c at the end of the cylinder tube 77a and the jack cylinder shaft 76 is used to operate the limit switch 87.

In the fifth example shown in FIG. 9, a limit switch 86 for detecting that the tire has swung more than the swing amount necessary to ground the tire is provided on the side of the cylinder tube 77a via a bracket 92 to reduce the play. A limit switch 87 is provided on the swing arm 75 for detecting the jack grounding based on a change in the amount.

In the sixth example shown in FIG. 10, a limit switch 86 is provided on the side of the cylinder tube 77a for detecting that the tire has swung more than the swing amount necessary to ground the tire. A limit switch 87 for detecting the grounding of the cylinder tube 77a is also provided on the cylinder tube 77a side via a bracket 91. In this sixth example, the cylinder switch 77a
The play between the end hole 77c and the jack cylinder shaft 76 is utilized.

Next, a limit switch 86 for detecting that the tire has swung more than the swing amount necessary to ground-disconnect the tire.
With reference to FIGS. 11 and 12, a seventh example of the embodiment in which the limit switch 87 for detecting the grounding of the jack based on the change in the amount of play will be described. In the swing type jack 100, the hole 1 at the end of the swing arm 105 is used.
05a is a hole 75a at the end of the swing arm 75 described above.
The swing arm 105 is supported by a swing arm shaft 74 provided at an end portion 73 of the vehicle body 72 by the hole 105a. A play t1 occurs between the swing arm shaft 74 and the hole 105a at the end of the swing arm 105. On the other hand, the jack cylinder shaft 76
The cylinder tube 77a of the jack cylinder 77
The hole 77c at the end of is supported. The tip of the rod 77b is pivotally supported by a pin 105b at the lower end of the swing arm 105 so that the swing arm 105 can swing.

At the upper end of the swing arm 105, the swing arm 105 swings over a predetermined swing amount necessary to ground the tire, and is turned on only when the swing arm 105 is in contact with the ground. Switch 107
Is provided. The limit switch 107 is provided with a button 107a having a roller 107b, and the button 107a is urged so as to abut the upper end of the swing arm 105. The upper end has different shapes on the left and right, and the right side protrudes with respect to the left side.
The position of the end face 105c of the protruding portion 105b is determined when the swing arm 105 swings by a predetermined swing amount necessary to ground the tire.
Is disposed at a position where the roller 107b of the limit switch 107 gets over.

That is, FIG. 1 before the jack is swung.
When the jack is swung more than a predetermined swing amount required to ground the tire from the state of FIG. 2 (A), the roller 107b rides on the protruding portion 105b, and the button 107a is pressed, as shown in FIG. 12 (B). Pushed. At this time, if the jack is in contact with the ground, the swing arm shaft 74 is supported by the hole 105a of the swing arm 105. As a result, the play t1 generated below the swing arm shaft 74 is blocked, and the play
This means that a has been pushed further. The limit switch 107 is set to be turned on when the pushing amount is reached. According to such a seventh example,
It is sufficient to provide one limit switch, and the configuration can be simplified.

[0040]

As described above, according to the operation control apparatus for a working vehicle according to the first and fourth aspects of the present invention, the working apparatus is operated until the jack operates a predetermined amount necessary for stabilizing the vehicle body. The operation of the work device is restricted, so that it is possible to prevent forgetting to tighten the jack when operating the working device.

By providing a grounding detector for detecting the grounding of the jack due to the extension of the jack, the jack operates by a predetermined amount necessary for stabilizing the vehicle body, and regulates the operation of the working device until the jack is grounded. It is possible to prevent forgetting to tighten the jack when operating the work device, and to further improve work safety.

Further, the structure is simplified by providing one limit switch which is operated by a predetermined amount or more necessary for stabilizing the body of the jack and which is operated in response to the movement of the jack due to the ground reaction force. Can be achieved.

[Brief description of the drawings]

FIG. 1 shows a configuration of a work vehicle provided with a telescopic jack according to a first example of an embodiment of the invention, FIG. 1 (A) is a rear view showing the entire configuration, and FIG. 1 (B) is an enlarged view of the jack. FIG.

FIG. 2 is a side view of the work vehicle shown in FIG.

3 shows a state in which the jack of the work vehicle in FIG. 1 is in contact with the ground, and FIG. 3 (A) is a rear view showing the entire configuration, and FIG.
FIG. 4 is an enlarged view of a jack.

FIG. 4 shows a state in which the work vehicle of FIG. 1 is separated from the ground, FIG. 4 (A) is a rear view showing the entire configuration, and FIG. 4 (B) is an enlarged view of a jack.

FIG. 5 is a hydraulic circuit diagram of the working vehicle according to the embodiment of the invention.

6A and 6B show a configuration of a telescopic jack according to a second example of the embodiment of the present invention, wherein FIG. 6A shows a state where the jack is not grounded, and FIG. 6B shows a state where the jack is grounded. FIG.

7A and 7B show a configuration of a swing type jack according to a third example of the embodiment of the present invention, wherein FIG. 7A shows a state where the jack is not grounded, and FIG. 7B shows a state where the jack is grounded. FIG.

FIG. 8 is a diagram showing a configuration of a swing type jack according to a fourth embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of a swing type jack according to a fifth example of the embodiment of the present invention.

FIG. 10 is a view showing a configuration of a swing type jack according to a sixth embodiment of the invention.

FIG. 11 is a view showing a configuration of a swing type jack according to a seventh embodiment of the present invention.

FIG. 12 is a view showing a configuration of an upper end portion of a swing arm of a swing type jack according to an eighth embodiment of the present invention. FIG. 12 (A) shows a state where the jack is not grounded, and FIG. () Is a diagram showing a state when the jack is grounded. .

[Explanation of symbols]

20, 50, 70, 100 Jack 21, 51 Outer member 22, 52 Inner member 22a Notch 23, 77 Jack cylinder 26, 27, 57, 86, 87, 107 Limit switch 26a, 27a, 57a, 86a, 87a, 107a
Buttons 26b, 27b, 57b, 86b, 87b, 107b
Roller 52a Flat plate 74, 76 Shaft 75, 105 Swing arm 75a, 77c, 105a 105b Projection t1, t2 Play

Claims (6)

[Claims] 1. A vehicle comprising: a movable vehicle body; a working device disposed on the vehicle body; and a telescopic jack provided on the vehicle body so as to be extendable and retractable downward and supporting the vehicle body by grounding. An operation control device for a work vehicle, wherein a restriction means for restricting the operation of the work device is provided until the jack extends for a predetermined stroke or more. 2. A grounding detector for detecting the grounding of the jack due to the extension of the jack, wherein the restricting means is configured to operate the working device until the jack extends for a predetermined stroke or more and the grounding of the jack is detected. The operation control device for a work vehicle according to claim 1, wherein the operation of the work vehicle is regulated. 3. A limit switch, which is operated in response to extension of the jack beyond the predetermined stroke and movement of the jack due to a ground reaction force, wherein the operation device is operated until the limit switch is operated. The operation control device for a work vehicle according to claim 2, wherein the operation control device regulates the operation of the work vehicle. 4. A movable vehicle body, a working device disposed on the vehicle body, and a swing-type jack provided on the left and right sides of the vehicle body so as to be swingable downward and supporting the vehicle body by touching the ground. An operation control device for a working vehicle, comprising: a regulating means for regulating the operation of the working device until the jack swings downward by a predetermined swing amount or more. Operation control device. 5. A grounding detector for detecting the grounding of the jack due to the rocking of the jack, wherein the regulating means controls the rocking of the jack by a predetermined rocking amount or more and until the grounding of the jack is detected. The operation control device for a work vehicle according to claim 4, wherein the operation of the work device is regulated. 6. A limit switch which operates in response to a swing motion of the jack equal to or more than the predetermined swing amount and movement of the jack due to a ground reaction force, wherein the working device is operated until the limit switch is actuated. The operation control device for a work vehicle according to claim 5, wherein the operation of the work vehicle is regulated.