JPH061397U - Leveling equipment for aerial work vehicles - Google Patents

Abstract

(57) [Abstract] [Purpose] A lower leveling cylinder 11 that connects the swivel 3 and the boom 5 and an upper leveling cylinder 12 that connects the boom 5 and the vertical maintaining member 7 are connected by connecting oil passages 13 and 14, and the boom 5 hoisting angle. In the leveling device for maintaining the verticality of the vertical maintaining member 7 regardless of the above, when performing the leveling adjustment work, it is not necessary to perform preparatory work for the leveling adjustment work, and it is not necessary to check the horizontal state of the workbench 8. Providing equipment. [Structure] Boom storage detection device 32, leveling detection device
33, selection switch 37, and shut-off valves 38, 39 are provided, and when the selection switch 37 is pressed when boom storage is detected and leveling is not detected, pressure oil is supplied to the connecting oil passages 13, 14. When leveling is detected, the pressure oil supply is stopped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The vehicle is equipped with a swivel base that can swivel, and a boom is installed on this swivel so that the boom can be swung up and down.At the tip of the boom, a vertical maintaining member that maintains the vertical position regardless of the hoisting angle of the boom is installed. It is related to the leveling device of an aerial work vehicle to which a workbench is attached.

[0002]

[Prior art]

 A description will be given based on FIGS. 4 and 5. An aerial work vehicle is provided with an outrigger 2 on a vehicle 1, and the outrigger 2 horizontally supports the vehicle 1 during work. A swivel base 3 is provided on the vehicle 1 so as to freely swivel, and a boom 5 that is freely hoisted by a hoisting cylinder 4 and that is telescopically driven by a telescopic cylinder 6 is provided on the swivel base 3. A vertical maintaining member 7 that maintains the vertical regardless of the undulation angle of the boom 5 is provided at the tip, and the workbench 8 is attached via the vertical supporting member 7. The vertical maintenance member 7 is adjusted from the beginning so as to be vertical to the vehicle with the vehicle installed horizontally. The leveling device includes a vertical maintenance member 7, a lower leveling cylinder 11 that connects the swivel base 3 and the boom 5 at the base end of the boom 5, and an upper leveling cylinder 12 that connects the tip of the boom 5 and the vertical maintenance member 7 at the proper position. Connecting oil passages 13 and 14 connecting the oil chambers of the lower leveling cylinder 11 and the upper leveling cylinder 12, and connecting one end to the oil supply / discharge passages 21 and 22 (hydraulic power source in the scope of utility model registration claims) and others Consists of supply oil passages 15 and 16 whose ends are connected to connecting oil passages 13 and 14, and selection valves 17 and 18 positioned at the connection points of the supply oil passages 15 and 16 and the supply and discharge oil passages 21 and 22. is doing. The supply / discharge oil passages 21 and 22 are connected so that pressure oil is supplied from the main switching valve 23, and the main switching valve 23 is configured to be operated manually and by remote control using solenoid valves 24 and 25. ing.

[0003] In an aerial work vehicle, during normal work, the selection valves 17 and 18 are connected to the oil supply / drain passages 21 and 22 and the oil passage to the telescopic cylinder 6 as shown in FIG. 22 is closed between the oil passages 15 and 16. When the main switching valve 23 is manually operated or operated by remote control using the solenoid valves 24 and 25, the pressure oil is supplied to the expansion and contraction cylinder 6 through the oil supply and discharge passages 21 and 22 and the selection valves 17 and 18. . The telescopic cylinder 6 is driven and the boom 5 telescopically operates. When the hoisting cylinder 4 is driven, the hoisting operation of the boom 5 changes the distance between the swivel base 3 to which the lower leveling cylinder 11 is attached and the base end of the boom 5, so that the lower leveling cylinder 11 moves. The expansion / contraction operation is performed, and the pressure oil is supplied and discharged between the lower leveling cylinder 11 and the upper leveling cylinder 12 through the connecting oil passages 13 and 14. By the expansion / contraction operation of the upper leveling cylinder 12, the angle between the boom 5 and the vertical maintaining member 7 changes in the opposite direction of the boom 5 elevating operation corresponding to the change in the hoisting angle of the boom 5, and the vertical maintaining member 7 changes. 7 keeps vertical.

After the workbench 8 has fallen down for maintenance such as cleaning, or when the workbench 8 is left for a long period of time and the workbench 8 is displaced from the horizontal position, the leveling adjustment of the workbench 8 is necessary. At the time of adjusting the leveling of the workbench 8, the selection valves 17 and 18 are switched to the positions opposite to the positions shown in FIG. 5 to close the oil supply and drain oil passages 21 and 22 and the oil passage to the telescopic cylinder 6 to supply and drain oil passage 21. , 22 and the supply oil passages 15 and 16 are communicated with each other. Since the supply oil passages 15 and 16 are in communication with the supply and discharge oil passages 21 and 22, if the main switching valve 23 is manually operated or the solenoid valves 24 and 25 are used for remote control operation, the pressure oil is The oil is supplied to the connecting oil passages 13 and 14 through the passages 21 and 22, the selection valves 17 and 18 and the supply oil passages 15 and 16. Since the hoisting cylinder 4 does not operate, the distance between the swivel base 3 to which the lower leveling cylinder 11 is attached and the proper position of the base end of the boom 5 does not change, so the lower leveling cylinder 11 does not extend and contract. The pressure oil supplied there is supplied to the oil chamber of the upper leveling cylinder 12, and the inclination of the vertical maintaining member 7 is changed by the expansion and contraction operation. When the inclination of the vertical maintenance member 7 changes, the inclination of the workbench 8 attached to it also changes. Therefore, the inclination of the workbench 8 should be monitored and the main switching valve 23 should be neutralized when the horizontal position is reached. Just go back to. Then, the leveling adjustment work is completed by returning the selection valves 17 and 18 to the positions shown in FIG.

[0005]

[Problems to be solved by the device]

 First, when performing the leveling adjustment work, it is necessary to first support the vehicle 1 horizontally by the outriggers 2 and then visually confirm the horizontality of the workbench 8, so that it is necessary to position the workbench 8 close to the ground. However, there is a problem in that the preparation work for leveling adjustment work is complicated. Secondly, since the main switching valve 23 is located on the swivel base 3 and the workbench 8 is located on the tip of the boom 5, it is impossible to confirm the horizontality of the workbench 8 from the swivel base 3. Is. Therefore, the operator operates the main switching valve 23 and walks to the position of the workbench 8 to repeat the work for confirming whether the workbench 8 is in the horizontal state, or the operator and the confirmer There is a problem that the leveling adjustment work itself is complicated because two people need to work together.

According to the present invention, when performing the leveling adjustment work, it is not necessary to perform preparatory work for the leveling adjustment work, and the worktable 8 is walked to the horizontal position. It is an object of the present invention to provide a leveling device for an aerial work vehicle that does not require the work of checking whether or not there is any.

[0007]

[Means for Solving the Problems]

 The leveling device for an aerial work vehicle of the present invention is provided with a swivel base that can swivel on the vehicle, and a boom can be hoisted up and down on the swivel base to keep the boom vertical regardless of the hoisting angle of the boom. It is a leveling device for aerial work vehicles that has a vertical maintenance member that is attached to the work platform via the vertical maintenance member.The lower leveling cylinder that connects the swivel base and the boom base end in place, and the boom tip end. The upper leveling cylinder that connects the vertical maintenance members in proper places, the connecting oil passages that connect the oil chambers of the lower leveling cylinder and the upper leveling cylinder, and one end of these connecting oil passages, and the other end is connected to the hydraulic power source. A supply oil passage for supplying pressure oil is provided, and when adjusting the leveling of the workbench, a suitable amount of pressure oil is supplied from the supply oil passage to the connecting oil passage to adjust the leveling of the workbench. The boom retractor that detects when the boom is in the retracted position, the leveling detector that detects that the workbench is horizontal, the selection switch that selects the leveling correction operation, and the electromagnetic type in the middle of the oil supply passage. When the boom retractor detects the boom retracted and the leveling detector does not detect that the workbench is horizontal, the leveling correction operation is selected by the selector switch. The boom storage detector, leveling detector, selection switch, and shut-off valve are configured in association with each other so that the shut-off valve is in communication and pressure oil is supplied from the supply oil passage to the connecting oil passage.

[0008]

[Action]

 When it is determined that leveling adjustment work on the workbench 8 is necessary, the boom 5 is stored in the storage position, and if the leveling correction operation is selected by the selection switch, the boom storage detection device detects that the boom 5 is in the storage position. Since the leveling detector detects that the workbench is horizontal, the solenoid valve 24 or 25 is excited and the main switching valve 23 is switched. The pressure oil passes through the oil supply / exhaust oil passage 21 or 22 (hydraulic power source in the scope of utility model registration claims), the shutoff valve, the oil supply passage 15 or 16 and the connecting oil passage 13 or 14, and the lower leveling is performed. The oil is supplied to the oil chambers of the cylinder 11 and the upper leveling cylinder 12, and the tilting of the vertical maintenance member 7 is changed by the expansion and contraction operation of the upper leveling cylinder 12 to change the tilt of the workbench 8. When the horizontal position of the workbench 8 comes out, the leveling detection device detects it, so that the solenoid valve 24 or 25 is not excited and the main switching valve 23 returns to the neutral position. This completes the leveling adjustment work.

[0009]

【Example】

 A description will be given based on FIGS. 1 to 4. The reference numerals 1 to 8, 11 to 18, and 21 to 25 used in the description of the conventional technique have the same meanings, and thus the description thereof will be omitted and used in the following description. 31 is a boom rest, 32 is a boom storage detection device, 33 is a leveling detection device, 34 is a cam, 35 and 36 are limit switches, 37 is a selection switch, 38 and 39 are shutoff valves, and 40 and 41 are relief valves. .

The boom rest 31 is configured to support the boom 5 so that the boom 5 does not move or swing from a predetermined storage position when the vehicle 1 travels, and the boom storage detection device 32 includes It is provided on the upper end of the boom rest 31, and when the boom 5 is stored and supported by the boom rest 31, the contact is closed to detect the storage. The leveling detection device 33 is configured by fixing the cam 34 to the vertical maintaining member 7 and attaching limit switches 35 and 36 to the tip of the boom 5, and when the vertical maintaining member 7 is at a predetermined angle with respect to the boom 5. The limit switch 35 and 36 rollers are mounted on the dog of the cam 34 to open the contacts of the limit switches 35 and 36 to detect that they are at a predetermined angle. The predetermined angle means an angle of the vertical maintaining member 7 with respect to the boom 5 stored and supported in the boom rest 31 when the vertical maintaining member 7 is perpendicular to the horizontal plane of the vehicle 1. When it is deviated from a predetermined angle, it is configured so that it is possible to detect which one of the limit switches 35 and 36 is deviated from the dog and which direction it is deviated from. The selection switch 37 is operated during leveling adjustment work to close the contacts, and the shutoff valves 38 and 39 are arranged in parallel with the selection valves 17 and 18 in parallel with the oil supply and drain passages 21 and 22 (practical use). The hydraulic pressure source (as claimed in the new model registration) and the supply oil passages 15 and 16 are connected so that the circuit is cut off during normal operation and connected during excitation. The relief valves 40 and 41 are connected to the connecting oil passages 13 and 14, respectively, and allow the excess oil discharged from the oil chambers of the lower leveling cylinder 11 or the upper leveling cylinder 12 to the connecting oil passages 13 and 14 to escape to the tank circuit. It is a thing.

The boom storage detection device 32 is connected to the battery, and the selection switch 37 is connected to the boom storage detection device 32 in series. The shut-off valve 38 and the solenoid valve 24 are connected in parallel and then connected in series with the limit switch 35.The shut-off valve 39 and the solenoid valve 25 are connected in parallel and then connected in series with the limit switch 36. ing. The limit switch 35 and the limit switch 36 are connected in parallel after the selection switch 37.

The operation will be described. During normal work, the battery is not fed to the leveling detection device 33 because the boom 5 is not supported by the boom rest 31 and the contacts are open or the contacts of the selection switch 37 are open. Therefore, the shut-off valves 38, 39 are not supplied with power, so the shut-off valves 38, 39 are in the position shown in FIG. 1 and the supply / discharge oil passages 21, 22 and the supply oil passages 15, 16 are shut off. There is. The selection valves 17 and 18 are the positions shown in FIG. 1, and the supply / discharge oil passages 21 and 22 are connected to the oil passages of the telescopic cylinder 6 and the supply oil passages 15 and 16 are closed, so that the main switching valve 23 is set. When operated, the pressure oil is supplied to the telescopic cylinder 6 through the oil supply / drain passages 21 and 22 and the selection valves 17 and 18, and the telescopic cylinder 6 is driven to extend and retract. When the hoisting cylinder 4 is driven, the hoisting operation of the boom 5 changes the distance between the swivel base 3 to which the lower leveling cylinder 11 is attached and the base end of the boom 5, so that the lower leveling cylinder 11 moves. The expansion / contraction operation is performed, and the pressure oil is supplied and discharged between the lower leveling cylinder 11 and the upper leveling cylinder 12 through the connecting oil passages 13 and 14. By the expansion / contraction operation of the upper leveling cylinder 12, the angle between the boom 5 and the vertical maintaining member 7 changes in the opposite direction of the boom 5 elevating operation corresponding to the change in the hoisting angle of the boom 5, and the vertical maintaining member changes. 7 keeps vertical. The normal operation is performed as described above.

When the workbench 8 shifts from the horizontal position and the work of correcting the leveling of the workbench 8 is performed, it is confirmed that the boom 5 is stored in the boom rest 31, and the selection switch 37 is pushed. The leveling detection device 33 detects in which direction one of the rollers of the limit switches 35 and 36 is disengaged from the dog. In the following description, it is assumed that the limit switch 35 roller is off the dog. The contacts of the limit switch 35 are closed so that the solenoid valve 24 and the shutoff valve 38 can be energized, and the contacts of the boom retractor detection device 32 and the contacts of the selection switch 37 are also closed. 24 and the shut-off valve 38 are energized, and both are switched to the positions opposite to those in FIG. 1 to establish communication. Then, the position of the spool of the main switching valve 23 is switched to the left side, and the pressure oil passes through the oil supply / discharge passage 21 and the oil supply passage 15 and is supplied to the connecting oil passage 13. Since the hoisting cylinder 4 does not operate, the distance between the swivel base 3 to which the lower leveling cylinder 11 is attached and the proper position of the base end of the boom 5 does not change, so the lower leveling cylinder 11 does not extend and contract. The pressure oil supplied there is supplied to the extension side oil chamber of the upper leveling cylinder 12, and the inclination of the vertical maintaining member 7 is changed by the extension operation. At this time, the pressure oil discharged from the compression-side oil chamber of the upper leveling cylinder 12 is released to the tank circuit by the relief valve 41 connected to the connection oil passage 14. The pressure oil from the main switching valve 23 passes through the oil supply / discharge oil passages 21 and 22, and the selection valves 17 and 18 to the compression side oil chamber of the telescopic cylinder 6, but the telescopic cylinder 6 is fully compressed in the retracted state. Therefore, the telescopic cylinder 6 does not operate.

When the horizontal position of the workbench 8 comes out, the angle of the vertical maintaining member 7 with respect to the boom 5 becomes a predetermined angle. Therefore, the roller of the limit switch 35 of the leveling detection device 33 rides on the dog of the cam 34 and the limit is reached. Open the contact of switch 35. At this time, the rollers of the limit switch 36 are still riding on the dog of the cam 34, so the solenoid valve 25 and the shutoff valve 38 are not energized and the solenoid valve 24 and the shutoff valve 38 are deenergized and excited. Disappear. Then, the spool of the main switching valve 23 returns to the neutral position, and the operation of the vertical maintenance member 7 stops. Now that the leveling adjustment work has been completed, it is sufficient to return the selection switch 37 to its original position.

The selection switch 37 has been described as being turned on when the leveling correction work is selected and returned when the leveling adjustment work is completed. However, if the selection switch 37 is pressed once, the leveling adjustment work is performed even if the selection switch 37 returns. The self-holding circuit may be working by the time it is completed.

The boom storage detection device 32 has been described as having a contact provided at the upper end of the boom rest 31, but the signal of the boom hoisting angle detector is the same hoisting angle as when the boom 5 is stored in the boom rest 31. It is also possible to detect that it has become.

Although it has been described that the oil supply passages 21 and 22 to the telescopic cylinder 6 are used as the hydraulic power source in the scope of claims for utility model registration, it goes without saying that a dedicated hydraulic circuit may be used. is there.

In the above description, the roller of the limit switch 35 is described as being displaced from the dog, but if it happens to be tilted in the opposite direction, the roller of the limit switch 36 will be disengaged from the dog. Then, the main switching valve 23 is switched in a direction opposite to the case where the roller of the limit switch 35 is disengaged from the dog, and the main switching valve 23 is supplied to the compression side oil chamber of the upper leveling cylinder 12 to change the inclination of the vertical maintenance member 7, The expansion / contraction cylinder 6 is expanded by being supplied to the expansion side oil chamber of the cylinder 6. If other parts are operated while only trying to perform leveling repair of the workbench 8, the operation does not cause damage.

In order to solve this point, the booms 5 may be mechanically locked to each other, but the leveling correction work is made simple and reliable, and this point is also solved on the circuit, as shown in FIG. It is an example shown in. Instead of the selection valves 17 and 18 of FIG. 1, shut-off valves 42 and 43 are provided which normally connect the circuit and shut off when energized. The shut-off valve 42 and the shut-off valve 43 are connected so as to be switched simultaneously with the shut-off valve 38 and the shut-off valve 39. Therefore, at the time of leveling correction work, the shutoff valve 42 or the shutoff valve 43 is excited, and the oil passage to the telescopic cylinder 6 is cut off from the oil supply / drain passages 21 and 22. The leveling cylinder 12 can perform leveling correction work.

[0020]

[Effect of device]

 A boom retractor, a leveling detector, a selection switch, and an electromagnetic shut-off valve are provided, and when the leveling correction operation is selected by the selection switch, the leveling correction operation is completed so that the leveling adjustment operation is completed. Therefore, there is no need to perform preparatory work, and also the leveling adjustment work itself is performed by operating on the swivel base and walking to the position of the work base to check whether the work base is in a horizontal state. Since it does not need to be repeated, leveling adjustment work can be performed easily and reliably, and is highly effective.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a leveling device for an aerial work vehicle according to the present invention.

FIG. 2 is an explanatory diagram showing a leveling detection unit.

FIG. 3 is an explanatory view showing another embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an aerial work vehicle.

FIG. 5 is an explanatory view showing a conventional leveling device for an aerial work vehicle.

[Explanation of symbols]

5 Boom 7 Vertical maintenance member 8 Work table 12 Upper leveling cylinder 13, 14 Connection oil passage 15, 16 Supply oil passage 21, 22 Supply / drain passage 32 Boom storage detection device 33 Leveling detection device 37 Selection switch 38, 39 Shut-off valve

Claims (1)

[Scope of utility model registration request] 1. A vehicle is provided with a swivel base capable of swiveling, a boom is erected on the swivel base, and a vertical maintaining member is provided at the tip of the boom for maintaining the vertical position regardless of the boom elevating angle. A leveling device for an aerial work vehicle with a workbench attached through a maintenance member, which is a lower leveling cylinder that connects the swivel and the boom base end in place, and an upper part that connects the boom tip and the vertical maintenance member in place. Supply oil passages that connect the oil chambers of the leveling cylinder, the lower leveling cylinder and the upper leveling cylinder, and supply oil passages that supply pressure oil by connecting one end to these connection oil passages and the other end to a hydraulic pressure source. When adjusting the leveling of the workbench and adjusting the leveling of the workbench by supplying an appropriate amount of pressure oil from the oil supply passage to the connecting oil passage, the boom is at the retracted position. Selection switches boom storage detecting device for detecting, the workbench select detecting leveling detection system for a leveling modify operation that it is horizontal in that,
An electromagnetic shut-off valve is provided in the middle of the oil supply passage, and when the boom retractor detects that the boom is retracted and the leveling detector does not detect that the work platform is horizontal, the selector switch activates. When the leveling correction operation is selected, the boom retract detection device, leveling detection device, selection switch, and shutoff valve are linked so that the shutoff valve is in communication and pressure oil is supplied from the supply oil passage to the connection oil passage. A leveling device for an aerial work vehicle characterized by being configured.