JPH0518393Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to an apparatus for working at high places using a loader vehicle.

(Prior art) As a conventional mobile high-altitude work device,
Publication No. 86101 discloses an excavator (hydraulic excavator) in which an elevating work platform is provided at the tip of the boom attached to the main boom in place of a bucket.

Furthermore, in Japanese Utility Model Application Publication No. 56-47900 and its microfilm, a workbench is installed on a mounting frame supported by a three-point linkage mechanism of a tractor so that it can be raised and lowered via a lifter that is extended and contracted by a hydraulic cylinder. It is shown.

Furthermore, Japanese Utility Model Application No. 61-142800 and its microfilm disclose a tractor in which a three-point link mechanism is provided with a work platform that can be raised and lowered by a lifting mechanism consisting of a fixed mast, a lifting mast, a lifting cylinder, etc. has been done.

(Problems to be solved by the invention) The device described in JP-A-50-86101 is equipped with an elevating work platform at the tip of the two-stage boom of a hydraulic excavator, as clearly shown in Figure 1. When the workbench is lowered to the ground, it requires a very large installation space, and this disadvantage becomes proportionally more pronounced as the length of the boom increases and the amount of lift increases. Furthermore, as shown in Japanese Utility Model Application Publication No. 56-47900 and Japanese Utility Model Application No. 61-142800, when a three-point link mechanism of a tractor is combined with a lifting mechanism such as a lifter, there is a slight difference between the three-point link mechanism and Since only the amount of lift can be obtained, the amount of lift of the workbench must rely solely on a lifting mechanism such as a lifter.

The purpose of this invention is to provide a mobile high-altitude working device that can achieve both a large lift amount and a small installation space by skillfully combining two types of lift mechanisms that can obtain sufficient lift amounts. .

[Structure of the idea]

(Means for Solving the Problems) The present invention provides a mobile high-altitude working device in which a work platform is provided on a moving vehicle so as to be able to be raised and lowered via a work platform lifting mechanism. A quick coupler 1 is attached to the tip of a lift arm 14 that is supported and moved up and down by a lift cylinder 13 on the vehicle side.
A work platform elevating base 16 is removably attached to the work platform elevating base 16 via a work platform elevating mechanism 21. Lifting control box 26 for controlling the side lift cylinder 13 and work platform lifting mechanism 21
is provided, and the hydraulic power source of the vehicle main body is shared by the hydraulic pressure circuit of the vehicle side lift cylinder 13 and the work platform side lift cylinder 23 that operates the work platform lifting mechanism 21, and these lift cylinders 1
A pilot check valve 85 and an orifice 86 are provided in the head side hydraulic circuits of Nos. 3 and 23.
Furthermore, the vehicle-side operating levers 61,
This is a mobile high-place work device that is wired with an electric circuit 72 that can be operated by switching when all of the devices 62a, 62b, and 62c are locked, and is equipped with an alarm 87 that warns of overload on the workbench 22.

(Function) The present invention uses the quick coupler 15 to remove the bucket provided at the tip of the lift arm 14 of the loader vehicle 11, and in place of this bucket, attaches the work platform elevating base 16.
2, the worker himself operates the lift control box 26 and lifts the lift cylinder 13 on the vehicle side.
and the worktable elevating mechanism 21 are controlled to expand and contract, respectively, to adjust the elevating and lowering of the workbench 22. A very large lifting amount, which is the sum of the sufficient lifting amount by the lift arm 14 of the loader 11 and the sufficient lifting amount by the work platform elevating mechanism 21, can be achieved in a relatively small installation space at the tip of the lift arm 14. It will be done.

(Examples) Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

As shown in FIG. 1, a lift arm 14 is mounted on a wheel type loader vehicle 11 and is moved up and down by a lift cylinder 13 on the vehicle side using a shaft 12 as a fulcrum.
A work platform lifting base 16 is detachably attached to the tip of the lift arm 14 via a quick coupler 15. That is, the lock side 15a of the quick coupler 15 is integrally attached to the tip of the lift arm 14, and the hook side 15b of the quick coupler 15 is integrally attached to the work platform lifting base 16 via the mounting bracket 17.
are connected by the method described below.

A workbench 22 is provided on the workbench elevating base 16 via a workbench elevating mechanism 21 so as to be movable up and down. The workbench elevating mechanism 21 is constituted by a pantograph-type expansion and contraction mechanism that is vertically expanded and contracted by a workbench-side lift cylinder 23.
The left side of the lower end of this pantograph-shaped telescoping mechanism is pivotally connected to the work platform lifting base 16, and the right side of the lower end is slidably fitted into the guide member 24 of the work platform lifting base 16, and the upper end of the pantograph-shaped telescoping mechanism The left side is rotatably pivoted to the lower surface of the workbench 22, and the right side of the upper end is slidably fitted to the guide member 25 on the lower surface of the workbench 22.

The workbench 22 is provided with an elevating control box 26 connected to the vehicle body, and a switch provided in the control box 26 controls the vehicle-side lift cylinder 13 for vertically moving the lift arm 14. and the workbench side lift cylinder 23 for extending and retracting the workbench lifting mechanism 21 are operated together.

The lift arm 14 of the loader vehicle 11 is provided with a parallel lift linkage. That is, a lever 32 is pivotally attached to the base end side of the lift arm 14 by a shaft 31, and a shaft 33 at the lower end of this lever 32 and a shaft 34 on the vehicle side are connected by a link 35. The shaft 12 to which the base end of the arm 14 is pivotally connected and each of the shafts 31, 33, 3
Since the members connected by 4 always maintain a parallelogram shape, the lever 32 rises in substantially the same attitude (same inclination angle) even when the lift arm 14 rises. A base end of a tilt cylinder 37 is pivotally connected to the upper end of this lever 32 by a shaft 36, and one end of a tilt link 40 is pivotally connected to the tip of the piston rod 38 via a shaft 39. The tip side of the lift arm 14 whose end is connected to the lock side 15a of the quick coupler 15 via a shaft 41 and further supports the lower part of the quick coupler 15 via a shaft 42 and the tilt link 40 are pivoted by shafts 43 and 44. They are connected by a tilt lever 45 attached thereto. With this parallel lift linkage, unless the tilt cylinder 37 is expanded or contracted, the quick coupler 15 is maintained at a constant posture (tilt angle) even if the lift arm 14 is moved up or down, and the work platform elevating base 16 is kept horizontal. It can be done.

As shown in FIG. 2, the lock side 15a of the quick coupler 15 is provided with hook side insertion portions 51 on both sides, and the upper hooks 52 of the hook side 15b are provided above the hook side insertion portions 51 on both sides.
(Fig. 1) is provided with a shaft part 53 that is engaged with, and a lock pin 55 inserted into the lower pin hole part 54 (Fig. 1) of the hook side 15b is slidably fitted on the lower side of the shaft part 53, A locking hydraulic cylinder 56 is interposed between the locking pins 55 on both sides. In FIG. 2, 57 is a portion to which the tilt link 40 is connected via the shaft 41, and 58 is a portion to which the tip of the lift arm 14 is connected via the shaft 42.

This quick coupler 15 has a hook side 15b that is integrated with the work platform lifting base 16 placed on the ground.
Then, by manipulating the loader vehicle 11, lift arm 14, and tilt link 40, the lock side 15a on the vehicle side is engaged from below, and the lock hydraulic cylinder 56 is extended to lock the lock pins 5 on both sides.
5 into the pin hole 54 of the hook side 15b shown in FIG. 1 as shown in FIG.
The lock side 15a and the hook side 15b are integrated.

Vehicle-side operating levers installed in the driver's seat, such as the parking brake lever 6 shown in FIG.
1 and 4 (this is the vehicle-side lift cylinder 13,
Tilt cylinder 37, workbench side lift cylinder 2
3. Hydraulic cylinder 56 for locking the quick coupler
When a plurality of hydraulic control valves (such as the hydraulic control valves 1 and 2) are locked, the locked state is electrically detected by switches 63 and 64.

For example, in the case of the parking brake lever 61 shown in FIG. 3, the horizontal position (brake off)
The brake lever 61, which has been rotated from the upright position (brake on), directly presses the switch 63 to turn it on.

Moreover, since the hydraulic control lever 62 shown in FIG. 4 is a lever that can be operated from the neutral position shown in the figure, the convex portion 65 protruding from the control lever 62 in the neutral position shown in the figure On the other hand, the lock plate 68 is rotated about the shaft 66 from the receiving part 67 in the unlocked position.
When the lever 62 is locked by inverting the lever and fitting the hole 69 into the convex portion 65, the lock plate 68 presses the switch 64 located below and turns it on. In addition, if the hydraulic control lever 62 shown in FIG. 4 is a control lever that can be operated in the cross direction from the neutral position shown in the figure and is used for controlling the lift cylinder on the vehicle side and for controlling the tilt cylinder, the hydraulic control lever 62 shown in FIG. When the lever 62 is locked by the lock plate 68 in the neutral position, the vehicle-side lift cylinder 13 and tilt cylinder 37 can be locked at the same time.

Then, only when all the lock confirmations by the switches 63 and 64 are completed, the work table 22
This enables switch operation using the control box 26.

To explain this using the electric/hydraulic circuit shown in FIG. Hydraulic control levers 62a, 62b, 62c
Switches 64a, 64b, 64c are opened and closed in conjunction with lock plates 68a, 68b, 68c.
are arranged in series, and even if one of the switches is not turned on, the electric circuit 72 is not closed, and the solenoid valve changeover switch 73 for lift arm elevation of the control box 26 provided in this circuit 72 and the operation No operating current is supplied to the solenoid valve changeover switch 74 for lifting and lowering the platform.

In FIG. 5, a hydraulic control valve 75 operated by a hand control lever 62a on the vehicle side is for controlling the lift cylinder 23 on the workbench side via a hydraulic circuit (not shown), and is also for controlling the lift cylinder 23 on the workbench side via a hydraulic circuit (not shown). A hydraulic control valve 76 operated by the hand control lever 62b is for controlling the tilt cylinder 37 via a hydraulic circuit (not shown), and is also a hydraulic control valve 76 operated by the hand control lever 62c on the vehicle side. The valve 77 is for controlling the vehicle side lift cylinder 13 via the hydraulic circuit 78, and the solenoid valve 81 operated by the changeover switch 73 of the work platform control box 26 is for controlling the vehicle side lift cylinder 13 via the hydraulic circuit 82. The solenoid valve 83 is used to control the lift cylinder 13 on the vehicle side, and the solenoid valve 83 operated by the changeover switch 74 is used to control the lift cylinder 23 on the workbench side via the hydraulic circuit 84.

The vehicle-side lift cylinder 13 and the workbench-side lift cylinder 23 are operated by their operating hydraulic circuits 82,
Pilot check valve 8 installed in 84
5 and orifice 86 prevent malfunctions and sudden expansion and contraction movements. That is, unless hydraulic pressure is supplied to the upper part of the cylinder, the pilot check valve 85 prevents hydraulic pressure from leaking from the lower part of the cylinder, and there is no risk of the work platform 22 inadvertently lowering. Throttling resistance is applied to the oil supplied to and discharged from the pistons 13 and 23, preventing sudden movement of the piston in the cylinder and preventing sudden movement of the workbench 22 up and down.

The lifting control box 26 is provided with an alarm 87 such as a red lamp or a buzzer to warn of overload on the workbench 22. As a means for detecting an overload applied to the workbench 22, as shown in the lower part of FIG.
A pressure switch 88 is provided to detect the oil pressure generated at 3. If an excessive load is applied to the workbench 22, the internal pressure of the cylinder 23 will also rise abnormally, and this pressure will close the pressure switch 88 and activate the alarm 87. The overload condition can be detected from the alarm, and the overload condition on the workbench 22 can be canceled by reducing the weight of the loaded object, the number of crew members, etc.

As shown in FIG. 5, the workbench-side lift cylinder 23, like the vehicle-side lift cylinder 13 and tilt cylinder 37, is connected to the hydraulic power source 9 of the vehicle body.
Because it is operated by hydraulic pressure supplied from 1,
Attachments on the workbench side can be made inexpensive. The locking hydraulic cylinder 56 of the quick coupler 15 is also operated by hydraulic pressure supplied from a hydraulic power source 91 in the vehicle body. In addition, each of the valves 75, 76, 7
7, 81, and 83 are in the neutral position, the hydraulic oil supplied from the hydraulic source 91 is drained into the tank 93 via the line 92 passing through the internal oil passage hole of each valve, so that the hydraulic oil is not supplied to the hydraulic source 91. No load applied.

In addition, as a double safety mechanism, the hand levers 61 and 62 on the vehicle side or the vehicle door 94 are installed to prevent the loader vehicle from being tampered with, erroneously operated, etc. during work, and to ensure safety during work. workbench 2
An electric circuit may be provided that is locked by an electric actuator (such as a solenoid) that can be remotely controlled by the second control box 26.

For the same purpose, when the stabilizer (not shown) provided on the loader vehicle 11 is grounded,
"You can work on the workbench 22.""Lock the vehicle side operating levers 61, 62 and vehicle door 94."
etc. should be displayed automatically.

Next, to explain how to use this high-altitude working device, the operator moves the loader vehicle 11 equipped with the work platform 22 as an attachment to a desired location, and presses the parking brake lever 61 on the driver's seat.
and various hydraulic control levers 62a, 62
Lock both b and 62c and get off the train. Next, get on the workbench 22 and check the lifting control box 2.
The solenoid valve 81 is controlled by the lift arm lifting solenoid valve switch 73 located at 6 to operate the vehicle-side lift cylinder 13, or the solenoid valve 83 is controlled by the work platform lifting solenoid valve switch 74 to operate the work platform. Operate the side lift cylinder 23 to raise and lower the workbench 22 to the desired height. In addition, when getting off the driver's seat, the levers 61, 62a, 62
If either one of b and 62c is not locked, the workbench 22 cannot be raised or lowered.

Next, in the above embodiment, the loader vehicle 1 is provided with a parallel lift linkage on the lift arm 14.
1 is shown, the invention is not limited to this type of loader vehicle, but can also be applied to loader vehicles with a conventional loader linkage.
However, if a normal loader linkage is used and the lift arm 14 is raised from the state where the work platform lift base 16 is placed on the ground, the work platform lift base 16 will tilt by about 20° to 30° during the ascent. This needs to be corrected.

Therefore, as shown in FIG. 6, in order to adjust the inclination angle of the work platform lift base 16, the tilt cylinder 37 is operated to correct the inclination of the work platform lift base 16 due to the vertical movement of the lift arm 14, and to level the work platform lift base 16 horizontally. A tilt cylinder correction circuit that maintains this is provided in the electric/hydraulic circuit.

The installation of this tilt cylinder correction circuit is simple; a tilt cylinder solenoid valve changeover switch 97 is provided in the electrical circuit of the lifting control box 26, and a tilt cylinder control switch 97 is installed in the hydraulic circuit of the loader vehicle. A cylinder operating solenoid valve 98 may be provided, and this solenoid valve 98 and the tilt cylinder 37 may be connected via a hydraulic line 99.

In the embodiment described above, the height and inclination of the workbench 22 are remotely controlled through a wired circuit by operating the switches in the control box 26 provided on the workbench 22. The workbench 22 may be radio-controlled by operating the operator. An electric actuator (such as a solenoid) for locking the vehicle-side lever may also be operated by radio control.

[Effect of idea]

According to the present invention, the workbench is provided via the workbench elevating mechanism at the tip of the lift arm that is pivotably supported on the loader vehicle so as to be vertically movable and is moved up and down by the lift cylinder on the vehicle side. A very large lifting amount, which is the sum of the sufficient lifting amount by the protruding lift arm tip and the sufficient lifting amount by the work platform elevating mechanism, can be secured in a relatively small installation space of the lift arm tip. In addition, a work platform elevating base is removably attached to the tip of the lift arm of the loader via a quick coupler, and a work platform is provided on this work platform elevating base so as to be movable up and down via a work platform elevating mechanism. Since at least the lift cylinder on the vehicle side and the lift control box for controlling the work platform lifting mechanism are provided, the versatility of the loader vehicle can be increased from loading work using a regular bucket to high-altitude work. In addition, the control box installed on the workbench allows the worker on the workbench to control the movement of the workbench himself.
It is safe and the height at which the lift stops can be determined accurately. In addition, the pilot check valve and orifice installed in the head side hydraulic circuits of the vehicle-side lift cylinder and work platform-side lift cylinder prevent the work platform from being lowered unexpectedly and from sudden vertical movement. The safety of workers on the workbench is ensured by a combination of hydraulic circuits and electric circuits, which are wired and can be operated by locking all vehicle-side operation levers, and an overload alarm on the workbench. can.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the mobile high-place work device of the present invention, Fig. 2 is a front view of its quick coupler, and Fig. 3 is a switch turned on by locking the parking brake lever. Figure 4 is an installation diagram of the switch turned on by the lock plate of the hydraulic control lever, and Figure 5 is the installation diagram of the switch turned on by the lock plate of the hydraulic control lever.
Fig. 6 is an electric/hydraulic circuit diagram to which a tilt cylinder correction circuit is added. 11...Loader vehicle, 13...Vehicle side lift cylinder, 14...Lift arm, 15...Quick coupler, 16...Work platform lifting base, 21...
Work platform elevating mechanism, 22...Work platform, 23...Work platform side lift cylinder, 26...Elevating control box, 61, 62a, 62b, 62c...
Vehicle side operation levers, 72... Electric circuit, 85...
...Pilot check valve, 86...Orifice, 87...Overload alarm.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A mobile aerial work device in which a work platform is provided on a moving vehicle so that it can be raised and lowered via a work platform lifting mechanism, which is pivotally supported on a loader vehicle so as to be movable up and down on the vehicle side. A work platform elevating base is removably attached via a quick coupler to the tip of a lift arm that is moved up and down by a lift cylinder, and a work platform elevating mechanism operated by a lift cylinder on the work platform side is mounted on this work platform elevating base. A work platform is provided so as to be able to be raised and lowered via the work bench, and the work bench is provided with a lifting control box for controlling at least the vehicle-side lift cylinder and the work platform-side lift cylinder, and the vehicle-side lift cylinder and the work platform-side lift are provided with a control box for lifting and lowering. The hydraulic power source of the vehicle body is shared by the hydraulic circuits for the cylinders, and a pilot check valve and orifice are installed in the hydraulic circuits on the head side of these lift cylinders. A mobile high-altitude working device characterized by being wired with an electric circuit that enables switch operation when all levers are locked, and equipped with an alarm to warn of overload on the workbench. (2) The movable height according to claim 1, wherein the work platform elevating mechanism is constituted by a pantograph-type telescoping mechanism operated by a lift cylinder on the work platform side. Office work equipment. (3) The mobile high platform according to claim 1, wherein the vehicle side operating levers or the vehicle door are locked by an electric actuator that is remotely controlled from a workbench. working equipment. (4) Registration of a utility model that allows work to be performed on a workbench while the stabilizer installed on the loader vehicle is grounded, and automatically displays requests to lock vehicle-side operating levers and vehicle doors, etc. A mobile high-place work device according to claim 1 or 3. (5) The mobile aerial work device according to claim 1, wherein the loader vehicle has a lift arm provided with a parallel lift linkage. (6) The loader vehicle is equipped with a tilt cylinder correction circuit that corrects the tilt angle of the work platform elevating base to maintain the horizontal position by correcting the inclination of the work platform elevating base due to the vertical movement of the lift arm. A mobile high-altitude working device according to claim 1, characterized in that it has the following features: