JPS5852200A - Lift device for height service car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lift device for an aerial work vehicle that is easy to operate.

As shown in FIG. 1, the conventional aerial work vehicle has a swivel base 8 attached to the body frame HC that can be rotated in the horizontal direction, and a base end 81 of the boot 80 is attached to the swivel base g. As well as being movably connected.

An sbc workbench 4 is attached to the tip of the boofu 3.

Further, an extendable cylinder 6 for extending and contracting the boof 8 is attached to the proximal end portion of the poom 8, and a undulating cylinder 6 for raising and lowering the boof 8 is connected to the poom 3 and the swivel base. 8, and the vehicle body frame l
A swivel device 7 is installed between the swivel table 8 and the swivel table 8. And the workbench is a telescopic cylinder 11 cylinder 6. By operating the undulating cylinder 6 and the turning device 7, it is configured to be able to extend and contract, move up and down, turn, or a combination thereof.

Further, a driving device 8 for controlling the operations of the telescopic cylinder 6, the undulating V-ring #'6, and the turning device 7 is attached to the workbench. Note that the same driving device 8 is also attached with a swivel base 8Ic (not shown).

While working on the workbench 4, the operator can operate the workbench to move the workbench to any desired position.

However, in many cases, when the operator moves the work platform number to an arbitrary position.

Activate the levitation V-ring/6 to raise and lower the work platform 2. The work platform may be too far away from the object to be worked on.

Conversely, the work platform noise will be too close to the object.

Therefore, it is necessary to operate the telescopic V cylinders b at the same time or one after the other to maintain the workbench 4 at a constant distance from the object to be worked on. In the same way, it is virtually difficult to mount the platform by activating one device, then deactivating it, and then activating another device to move the platform to the desired position.

The present invention aims to alleviate the above-mentioned complexity of driving operations. Then, an object distance detection device for detecting the relative distance between the work platform No. 9 and the object to be worked is installed on work platform No. 9, and this automatically expands and contracts the pool 8.
This makes it possible to eliminate the operator's operation of expanding and contracting the pool 8. In other words, the lift device for an aerial work vehicle of the present invention includes a vehicle body frame, an IC attached to the vehicle body frame, and an IC mounted to the vehicle body frame. A swivel table capable of rotating in the horizontal direction, and a swivel device for rotating the swivel table with respect to the scissor car body V-5 are attached to the swivel table.

It consists of a raised/lowered boot foot, a raised/lowered device for raising and lowering the pool with respect to the swivel base, a telescoping device for extending and contracting the pool, and a work table attached to the tip of the pool, and an object distance detection device on the work table. Set up equipment.

If the distance between the workbench and the object is greater than a certain value, the expansion and contraction device will extend the pool and separate the workbench and the object.
The device is characterized in that the pool is contracted by the expansion and contraction device if the distance is less than a certain value.

In addition, it is preferable that the telescopic device is driven by the object distance detection device so that it works only when automatic operation is selected by the operator's selection. From the viewpoint of worker safety, it is preferable that the telescoping device is automatically driven only when the telescoping device is in motion.

This will be explained below using examples.

FIG. 1 shows the external appearance of the lifting device for an aerial work vehicle according to the present invention. Swivel base 8.1-F300 work number, telescopic v1-16
．． The undulating V-cylinder 6 and the swivel device 7 are the same as previously described in the prior art.

The distinctive features of the present invention are mainly the mechanical object distance detection device 9 attached to the lower tip C of the work platform and the telescopic V ring 16, which will be explained on the bale. This is an operation circuit for the undulating cylinder 6 and the turning device 7.

-゛The object distance detection device 9 used in this embodiment has an extension switch 91 @ a contraction switch 98 and a protrusion near the other end for pressing the switch, as shown in an enlarged view in Fig. 2. 94 more seven! -Arm 96. And the tip of Sen-tube-7-59JS is made of a front C# spring 96. The object distance detection device 9 shown in FIG. 8 shows a state in which the integrated system and the workbench are at a predetermined distance and both the extension switch 91 and the contraction switch Qmk are turned off.

The operating electrical circuit on the workbench 4 of this embodiment is shown in FIG.
From the positive power supply, the automatic manual changeover switch IIK is connected, and its manual terminal 11m is connected to the expansion/contraction operation leper switch.
11C wired. The expansion/contraction operation lever switch 18 has a neutral position between the expansion terminal 12a and the contraction terminal 18b. It is connected to AC and then grounded. On the other hand, shrink terminal 1
8b is connected to a contraction solenoid F1 to 11r, which will be explained later, and is grounded to the 0th order.

The automatic terminal 11b of the automatic/manual changeover switch 11 is connected to an interlocking switch 14 that operates in conjunction with the up/down operation lever switch 18. The interlocking switch has a neutral position at eight terminals 14 and 14b.

A detection switch IJSC of the object distance detection device 9 is connected to the eight terminals 14m and 14. Is the detection switch the extension solenoid 1? It has an extension terminal 115m connected to a, a contraction terminal 15b connected to a contraction solenoid In, and a neutral position.

The operation lever switch φ18 for raising and lowering is connected to the power supply, and the raising terminal 18 is connected to the raising solenoid 18m.
Downfall terminal 1 connected to al downfall solenoid 18b
8b and a neutral position.

This lever switch 18 for luffing is connected to the interlocking switch 14 by a connecting rod 16, and when the luffing operation V purse switch 18 is electrically connected to either terminal 18m or 18b, it is connected to the automatic terminal 11b of the automatic manual changeover switch 11 and the detection switch. 16 is conductive, and when the uphill operation lever switch 18 is in the neutral position, the automatic terminal 11b of the automatic manual changeover switch 11
and the detection switch 15 is turned off. - This operation circuit allows the expansion and contraction of the pool 8 to be operated manually or automatically by operating the switch of the automatic manual switching switch 11. .

In the case of automatic operation, the actuation tube is activated only when the lever switch 18 for raising and lowering the pool 8 is electrically connected to any terminal.

FIG. 4 shows a hydraulic circuit necessary to drive the telescopic cylinder 6 and the undulating cylinder 6 in this practical example.

This hydraulic circuit includes a hydraulic oil tank TI filter F, a hydraulic pump P, and an engine E that drives a hydraulic pump P. A telescopic cylinder 51m is connected to the hydraulic pump P via a first control valve 17. The undulating Vl pin 6c is connected via the eighth control valve 18. Both the first control valve 17 and the second control valve 18 are operated by electromagnetically operated solenoid valves. When current is applied to the solenoid in m, 17 and 18 @, 18 b, the solenoid core is activated and the defun V-ya is directly pushed and the oil passage is switched from the neutral position (=,-tral feeder), and the telescopic V-rimmero and undulating Cylinder lc pressure oil comes out 0
Next, when the current to the solenoid is cut off, the suction force of the solenoid disappears and the Pufun Vya returns to its original neutral position. This fourth
In the oil pressure IN1 road shown in the figure.

When no current flows through any of the solenoids, the pressure oil passes through the neutral position of each control valve 17 and 18 to the hydraulic oil tank T.
K Go back. When a current is applied to the extension solenoid 17m, the defn- er is pushed in and the pressure oil flows into the bottom chamber 51 of the extension V ring 6.

On the other hand, the hydraulic oil in the piston rod '1152 of the telescopic V cylinder 5 returns to the hydraulic oil tank T. As a result, the piston of the telescopic ν cylinder 6 is extended, and 1-58 is extended.

When the current to the extension solenoid lem is cut off and the current is applied to the contraction solenoid 17b', the hydraulic oil flows in the opposite direction and the poom 8 contracts. The relationship between the first control valve 17 and the telescopic cylinder 6 is similar to that between the eighth control valve 18 and the undulating V cylinder 6.
This is the same as the relationship between
Oil flows into or out of the cylinder bottom chamber 61 and the piston rod chamber 6B. As a result, the undulating VQ roller 6 is actuated, and the pool 8 is undulated.

As mentioned above, in this embodiment, in order to increase safety, the automatic expansion and contraction of the pool 3 is carried out by the automatic manual changeover switch 11 being connected to automatic operation, and the levitation operation lever switch 1
3 is electrically connected to either the rising terminal 18a* or the blowing down terminal 18b, that is, the poom 8 is activated only when it is rising or blowing down. Therefore, when the worker on the workbench 4 wants to stop the expansion and contraction of the pool 8, he returns the levitation operation lever to the neutral position and sets the levitation operation lever switch 18 to the neutral position, thereby turning off the interlocking switch 14. Automatic expansion and contraction stops. For this reason.

Any inconvenience caused by the automatic expansion and contraction of the pool 8 can be immediately avoided.

In the above-mentioned embodiment, the pool 8 is automatically extended and retracted in conjunction with the levitation operation lever switch 18, but the turning operation lever switch 18 is linked to the operation lever switch 18 for turning. It is also possible to automatically extend and retract the pool 8 in conjunction with the lever switch 13 shown in FIG. The remaining circuits may be the same except that the rising solenoid 18k is replaced by the solenoid for turning to the right, and the solenoid for blowing down 18k is replaced by the solenoid for turning to the left.

Note that the automatic operation of the boom 8 does not necessarily have to be linked to the luffing lever switch 13 or the turning lever switch.For safe and simple high-altitude work on objects, the linking switch 14 can be used, and the automatic manual switching switch φ11 can be used. The automatic terminal 11% and the detection switch 16 can be connected.

Note that the telescoping device, the up-and-down casing, and the turning device are not limited to those shown in the embodiments, and other known devices and mechanisms having the same function can be adopted, and the object distance detection device However, the present invention is not limited to those shown in the embodiments, and any known device using light, sound waves, etc. may be employed.

[Brief explanation of drawings]

@Figures 1 to 4 are internal diagrams of a lift device for a vehicle for aerial work that is an embodiment of the present invention. Figure 1 is a side view of the vehicle for aerial work, and Figure 8 is an object distance detection device. , FIG. 8 is an operating electrical circuit diagram, and FIG. 4 is a hydraulic circuit diagram. In the figure, numeral l indicates the vehicle body frame, 3 indicates the swivel base, 8 indicates the boom,
4 is a workbench, 6 is a telescopic V 13 cylinder, 6 is an undulating V 1 cylinder, F is a turning device, 8 is a driving device, and 9 is a hot object distance detection device. Patent Applicant Toyota Industries Corporation Patent Attorney Hiroshi Okawa

Claims (1)

[Claims] (1) A vehicle body frame. A swivel base attached to the vehicle body frame cwX and capable of rotating horizontally with respect to the vehicle body frame. a swivel device that swivels the swivel base relative to the vehicle body V-5; The swivel base is attached to a 2-degree raised and lowered pool. and an expansion and contraction device that expands and contracts the pool. In a lift gauge device for an aerial work vehicle comprising a workbench attached to the tip of said 1-5. The worker is provided with an object distance detection device, and if the distance between the workbench and the object is above a certain value, the expansion device extends the pool, and even if the distance between the workbench and the object is below a certain value, (g) Lift device for workers at high places, characterized in that the pool is contracted by the telescopic equipment.
Lift device for an aerial work vehicle according to claim 1, wherein the actuation of the pool by the object distance detection device is possible only when the swing device or the telescoping device is in operation.