JPS602594A - Boom and outrigger operation drive in service car with boom - 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 (a) Industrial Application Field The present invention is directed to a boom equipment capable of displacing a boom that is undulating, telescopic, and retractable, as well as actuating outriggers for fixing a vehicle body. The present invention relates to an improvement of a working device operating device for a working vehicle with a boom, and is used in the field of ensuring operational safety of a working vehicle with a boom by avoiding redundant operation of the boom operating device and outrigger operating device.

(b) Prior Art Figure 1 shows an aerial work vehicle 1 which is an example of a work vehicle with a boom. , and a hydraulic circuit for an outrigger 4 that stably fixes the vehicle body on the ground. The operating procedure is as follows.

First, after stopping the aerial work vehicle 1 at a predetermined position, the outriggers 4 installed on the left and right sides of the front and rear of the vehicle body are extended horizontally and downwardly to fix the vehicle body on the ground. Aim for stability. Next, boom operating hydraulic equipment 5 such as a swing motor 5a for moving the gondola 3 attached to the tip of the boom 2, a luffing cylinder 5b, and a telescopic cylinder 50,
Each operation panel 6A on the gondola side or the car body side,
Command levers 6a, 6b..., 7a, 7 provided on 7A
It is activated by b. When the gondola 3 reaches a desired position due to the displacement of the boom 2, the movement of the boom 2 is stopped and the gondola 3 performs a predetermined high-place work. When the work is completed, displace the boom 2 and return it to the boom position 8 as shown in the figure, and pull the outrigger 4 into the vehicle body to start driving.
iJ is in a capable state.

A hydraulic oil supply/discharge valve in the hydraulic circuit for boom displacement and outrigger operation is provided independently, although not shown. The supply and discharge valves interposed in the hydraulic circuit of the boom are electromagnetic control valves that supply and discharge hydraulic oil, or electromagnetic proportional control valves that adjust the supply and discharge and the amount of supply and discharge, and are energized to excite the solenoid. The circuit is configured to be opened only by operating the boom displacement command lever, regardless of the operating state of the outriggers.

As a result, the boom can be displaced regardless of the operation of the cylinder or jack that operates the outriggers, and the outriggers can also be operated regardless of the state of the boom. Therefore, an operator may erroneously pull in the outriggers before the boom has been returned to the boom position, or displace the boom without the outriggers securing the vehicle body.

In such a case, the support of the vehicle body by the tires alone cannot support the moment generated by the weight of the boom or gondola, resulting in an extremely dangerous situation such as the vehicle body overturning.

(C) Purpose of the invention The present invention was made to solve the above-mentioned problems.
In a work vehicle with a boom, which prevents the displacement operation of the boom when the vehicle body is not fixed by the outriggers, and also prevents the operation of the outriggers when the boom is not at the home position, thereby preventing the vehicle body from overturning. The object of the present invention is to provide a boom and outrigger actuation operating device.

(d) Structure of the Invention The structure of the present invention will be explained with reference to FIGS. 1 and 2. Boom actuating devices 5 such as a swing motor 5a that displaces the boom 2, a luffing cylinder 5b, and a telescopic cylinder 50
and a working vehicle 1 having an armer 1 and a rigger operating device 13 for operating an outrigger 4 for fixing the vehicle body.
, a three-position electromagnetic control switching valve 10 is provided to switch the supply of working fluid to the boom operating circuit 12 or the outrigger operating circuit 15, and a switch SWI which is activated when it is detected that the boom 2 has returned to the home position 8 is provided. , the switching valves 19.28a~ interposed in the outrigger operating circuit 15.
A switch SW2, which is activated when it is detected that the switch 28d is activated, is interposed in series with one solenoid energizing circuit 11A of the 3-position electromagnetic control switching valve IO, and the switching valve is connected to the outrigger operating circuit 15. 19.28a-28
A switch that operates when it is detected that d is not operating.
7 switch SH3 and a switch SW4 that is activated when the fixation of the vehicle body by the outrigger 4 is detected are interposed in series with the other solenoid energizing circuit 11B of the 3-position electromagnetic control switching valve 10. This is an outrigger operating device.

(e) Examples Hereinafter, the present invention will be explained in detail based on examples thereof.

Figure 2 shows an example of the boom and outrigger hydraulic operating device at the ILT+ station work station, with three circuits for switching circuits.
Two solenoid energizing circuits 1 of the position electromagnetic control switching valve 10
It is a partial hydraulic circuit diagram including 1A and 11B. This is the boom operating hydraulic circuit 12 that drives the boom operating hydraulic equipment 5 such as the swing motor 5a, the luffing cylinder 5b, and the telescopic cylinder 5c shown in FIG. 3, or the boom operating hydraulic circuit 12 shown in FIG.
~ Left and right extended cylinders 13 that are Riga operating hydraulic equipment 13
a to 13d, and hydraulic oil can be supplied to an outrigger operating hydraulic circuit 15 that drives the vertical jacks 14a to 14d. This hydraulic oil is supplied to the boom operation 'IJJ hydraulic circuit 12 or the outrigger operation hydraulic circuit 1.
A three-position electromagnetically controlled switching valve 10, which switches to 5, is provided between the electromagnetic proportional control valves 16-18 and the outrigger telescopic manual switching valve 19 of each circuit 12.15 and the hydraulic pump 20.

One solenoid energizing circuit 11Δ for exciting the ten solenoids 10a of the three-position electromagnetic control switching valve with electric power from the power source 21 includes a switch SWI that is activated when it is detected that the boom has returned to the Baum position. ,
A switching valve 1 interposed in the outrigger operating hydraulic circuit 15
A switch SW2, which is activated when it is detected that the switch 9 is activated, is interposed in series. Furthermore, the 10 solenoids 10b of the 3-position electromagnetic control switching light are powered by the power from the power source 21! The other solenoid energizing circuit 1113 for magnetizing includes the outrigger operating hydraulic circuit 1.
The switch pot 3 is activated when it is detected that the switching valve 19 interposed in the switch valve 5 is not in operation, and the switch pot 4 is activated when it is detected that the vehicle body is fixed by the outrigger 4.
are interposed in series. (The switch 1 in 1iij is, for example, a normally open contact. For example, the limit switch LSI installed on the upper part of the boom support leg 23 of the aerial work vehicle I shown in FIG. It is connected when it returns to position 8.The switch SW
2. SW3 is two solenoid energizing circuits 11A, IIB
For example, as shown in FIG.
It is activated by the limit switch LS2 that engages and disengages from the recess 26 in the ☆j1.1 section. Zunawaji, the switching valve 19 is the second
When in the neutral position 19Δ shown in the figure, switch 2 is cut off and SW3 is connected, so that the solenoid energizing circuit 11B is enabled to be energized, and the neutral position 19A is manually switched to the extension side 19B or the contraction side 19C. Then, switch SW2 is connected and SW3 is cut off, so that the solenoid energizing circuit 11A becomes energized. In addition, limit switch 1. s2 is operated in conjunction with not only the switching valve 19 but also manual switching valves 282 to 28d (see FIG. 4) that command the left and right and up and down directions provided to operate the respective outriggers. In short, the left and right extended cylinders 13a to 13d, which are the outrigger operating hydraulic equipment 13,
Alternatively, it may be possible to detect that any one of the vertical jacks 14a to 14d is activated. The switch needle 4 indicated by mj is composed of normally open contacts r1 to r4 interposed in series with the solenoid energizing circuit 11B, and when all of these contacts are connected, the energizing circuit 11B can be energized. These normally open contacts, which are not shown in FIG.
When a = l 3 d is displaced as shown by the solid line within the outrigger case 24, Limi-No. 1 to switch LS3 are activated.
~1, even if it becomes connected by S6). It goes without saying that a limit switch may be attached to the Q part so that it will be activated or deactivated once the vehicle body is fixed.If the limit switch is to be inactivated by 1°, the above-mentioned normally open contact r1 to r44 may be replaced with normally open contacts.

The boom operation hydraulic circuit 12 shown in FIG.
Although the example in which electromagnetic proportional control valves 16 to 18 are interposed to supply and discharge hydraulic oil and adjust the amount of supply and discharge is shown, if only the supply and discharge of hydraulic oil is required, G and A corresponding electromagnetic control valve may be provided. In addition, the outrigger operating hydraulic circuit 15 shown in FIG. 4 includes a telescopic manual switching valve 19 for switching between extension and contraction, and four manual switching valves 2 for selecting left/right or upward/downward operation of each outrigger.
8a to 28d are shown, but if the telescopic manual switching valve 19 is not provided, a manual switching valve for left and right telescoping for one outrigger and a manual telescoping valve for downward direction (not shown) are provided for one outrigger. A switching valve may be provided, and a total of eight manual switching valves may be provided. In this case, when at least one of all the manual switching valves is switched, it is detected that hydraulic oil is supplied to the outrigger operating hydraulic circuit 15, thereby connecting the switch 2 and shutting off SW3. Just do it like this.

According to an embodiment having such a configuration, it can be operated as follows.

When the boom 2 installed on the aerial work vehicle 1 shown in FIG. 1 is located at the boom position 8, when the operator presses the operating lever 19a of the outrigger telescopic manual switching valve 19 shown in FIG. Switch from 19A to extension side 19B. At this time, since the spool 25 moves in the direction of the arrow 29 (not shown in FIG. 5), the tip roller 27 of the limit switch LS2, which had been engaged with the recessed portion 26, comes off and contracts, and is activated.

This connects the switch 2, which is a normally open contact not shown in FIG. On the other hand, the frame 2 is at the home position 8 as if it were connected twice, and the limit switch LSi attached to the support leg 23 of the boom holder is also in the operating state. Since it is connected, power supply 2 is connected through this circuit.
The solenoid l"lO,l is energized by the electric power of 1. Therefore, the 3-position electromagnetic control switching valve lO, which is normally in the neutral position 108, is switched to the position 10B, and the hydraulic oil is supplied to the outrigger operating hydraulic circuit 15. At the same time, the supply to the boom operating hydraulic circuit 12 is cut off.

In this state, for example, when the operating lever 28rn of the manual switching valve 28b shown in FIG. Position 19B of telescopic manual switching valve 19 and position 2 of manual switching valve 28b
8C, it is supplied to the chamber 13A of the left and right extended cylinders 13b. As a result, the piston i3N moves and the right front outrigger of the vehicle body extends laterally. After extending the other outriggers by a predetermined amount in this way, the manual switching valve 28a
28d to other positions 28B, the hydraulic oil follows the same path and moves up and down to the 7 keys 14a to 1.
4d is supplied to chamber 14A, and the outrigger extends downward. When the outriggers reach the ground and the vehicle body is stabilized, the vehicle body is fixed on the ground, so each of the manual switching valves 28a to 28d is returned to neutral and the supply of hydraulic oil is stopped.

In such an operation, the hydraulic oil discharged from the left and right extended cylinders and the vertical jack is transferred to the oil tank 30.
Needless to say, it will be returned to .

Note that before the vehicle body is fixed by the outrigger 4, the switch 3 and the switch 4 of the circuit 11B are not connected, so power from the power source 21 is not supplied to the solenoid 10b, and the switch 3 Position electromagnetic control switching valve 10 is in position 1
Therefore, even if you accidentally operate the command levers 6a to 7d (see Figure 2) that operate the boom operating hydraulic equipment 5 while the outriggers 4 are extending or retracting, they will not operate. Oil is controlled by electromagnetic proportional control valve 16-1
8, and the hydraulically operated equipment 5 does not operate. In this way, the aerial work vehicle can be stopped at a predetermined position.
Even if you displace the boom before fixing the vehicle body with the outriggers, you will know that it is necessary to use the outriggers to secure the vehicle body because the boom operating hydraulic equipment will not operate, and the vehicle body will not roll over due to incorrect operation. I don't get it.

Next, when the operator returns the outrigger telescoping manual switching valve 19 to the neutral position 198, the tip 1 coke 27 of the Limi Noto Sui Nochi LS2 fits into the recessed part 26 of the spool 25 again, and its operation is stopped. As a result, the switch SWZ of the solenoid energizing circuit 11A is forcefully restored, the energization of the circuit 11A is cut off, and the energizing force G of the solenoid loa of the 3-position electromagnetic control switching valve 1 () is turned off. It returns to the neutral position 10A. At this time, in the outrigger 4,
Left and right extending cylinders 13a to 1 as shown in Fig. 6G.
3d changes from not shown with an imaginary spinning wheel to a solid line (,
>, so the limiter provided inside the outrigger case 24
Notoisochi LS3 to LS6 are left and right extended cylinders 13
It operates by coming into contact with a to 13d. Therefore, all of the normally open contacts r1 to r4 of the solenoid energizing circuit 11B are connected, and the switch or switch 4 is enabled to be energized. On the other hand, since the outrigger telescopic manual switching valve 19 has been returned to the neutral position 19A, the switch SW3 of that circuit is also in the connected state. The solenoid 10b is powered by the power source 21 through this circuit.
is excited, so the 3-position electromagnetic control switching valve 10 is in position 1.
．． OC, it is possible to supply hydraulic oil to the boom operating hydraulic circuit 12, and the outrigger operating hydraulic circuit 1 is switched to OC.
The supply to 2 is cut off. In this state, for example, when the command lever 6b of the operation panel 6A or 7A shown in FIG. Ru. Therefore, the solenoid 17a of the electromagnetic proportional control valve 17 interposed in the boom operating hydraulic circuit 12 is energized by the power of the power source 21, and the valve is switched from the neutral position 17A to the position 17B as shown in FIG. Hydraulic oil from the hydraulic pump 20 is supplied to the luffing cylinder 5b through the position 10G of the three-position electromagnetic control switching valve 10 and the position 17B of the electromagnetic proportional control valve 17, and the boom 2 is raised. Similarly, by operating the other command levers 6a and 6C, the boom 2 can be extended/contracted or rotated, and the gondola 3 can be moved to a desired position.

When the boom 3 is displaced in this way, the limit switch LSI of the boom support leg 23 is not activated, so the switch S of the solenoid energizing circuit 11A in FIG.
WI is in the open state, and the 3-position electromagnetic control switching valve 10
is held at position 10C. Now, the worker accidentally
Even if the operating lever 19a of the outrigger telescopic manual switching valve 19 is operated, hydraulic oil is not supplied to the outrigger operating hydraulic circuit 15, and the fixation of the vehicle body by the outriggers 4 is maintained. As a result, the vehicle body is prevented from overturning due to the moment due to the weight of the gondola 3 and the boom 2 due to an operator's operational error. When the work of loading the gondola 3 is completed, the boom 2 is activated by appropriately operating the command lever described above to energize the prescribed solenoids of each of the electromagnetic proportional control valves 16 to 18, and selecting the opening position of each valve. It can be returned to the home position. This moment,
The limit switch LSI of the support leg 23 is activated, and the switch 1 of the solenoid energizing circuit 11A is connected to the boom receiver. Therefore, when the operator switches the outrigger telescopic manual switching valve 19 from the neutral position 19A to the contraction side of position 19G,
As described above, the limit switch LS2 is disengaged from the recess 26 of the spool 25 and operates, and the switch SW2 is connected. Since the 3-position electromagnetic control switching valve 10 is switched to position 10B, by operating the operating lever 28m of the manual switching valves 28a to 28d in the opposite direction to the above-mentioned direction, the left and right extending cylinders 13a to 13d1 are turned to the vertical direction 142 to 14d.
can be reduced respectively. In addition, outrigger 4
Even if you accidentally operate the command levers 6a to 7d that actuate the boom operating hydraulic equipment 5 while the boom operating hydraulic equipment 5 is being extended or retracted, the supply of hydraulic oil to the boom operating hydraulic circuit 12 will be interrupted.
Since it is shut off by the position electromagnetic control switching valve 10, the gondola 3 will not move.

The above-mentioned embodiments have been described using hydraulically operated hydraulic equipment and boom-operated hydraulic equipment. Boom actuating equipment consisting of undulating cylinders, telescoping cylinders, etc. may also be employed.

It goes without saying that the present invention can also be applied to cases where left and right extending cylinders or swing motors are not provided, or to crane trucks that do not have a gondola).

(f) Effects of the Invention As can be seen from the description of the embodiments above, the present invention includes a switch that is activated when it is detected that the boom has returned to the boom position, and a switching valve that is interposed in the outrigger operating hydraulic circuit. By interposing a switch that operates when it is detected that the outrigger is in operation and a switch that operates when the outrigger is detected to be fixing the vehicle body, the outrigger operating hydraulic equipment and the boom operating hydraulic equipment are overlapped. activation can be avoided. That is, depending on whether or not these switches are connected, the opening position of the 3-position electromagnetic control switching valve for circuit switching is automatically switched, and hydraulic oil is supplied only to either the boom operating hydraulic circuit or the outrigger operating hydraulic circuit. Therefore, even if an operator accidentally operates the outrigger operating hydraulic equipment when the boom is not at the home position, the outrigger operation can be prevented. In addition, when the vehicle body is not fixed by the outriggers, displacement of the boom is prevented, and rollover of the vehicle body can be prevented.

[Brief explanation of the drawing]

FIG. 1 shows a boom with a gondola attached thereto, and a rig. An elevational view of an elevated work table, FIG. 2 is an embodiment of the boom and outrigger actuating device installed in the boom-equipped work vehicle of the present invention, and shows a part including the solenoid energizing circuit of the circuit switching mm3 position electromagnetic control switching valve. Hydraulic circuit diagram, Fig. 3 is a boom operating hydraulic circuit diagram that drives the boom operating hydraulic equipment, Fig. 4 is an outrigger operating hydraulic circuit diagram that drives the Ara I/Riga operating hydraulic equipment, Fig. 5 is the Outrica telescopic manual switching valve. FIG. 6 is an illustration of the installed state of the limit switch installed in each rig and its operation. 2-Boom, 4-Autrica, 5-Boom operating equipment, 5
a - Swivel motor, 5b - Lifting cylinder, 5 c, - Telescopic cylinder, 8 - Home position, 10 - 3 position electromagnetic control switching valve, IIA, 11B - Solenoid energizing circuit, 1
2-Boom actuation circuit, I3-Outrigger actuation device, 15
- Outrigger operating circuit, 19 - Outrigger telescopic manual switching valve, 282~28d - Manual switching valve, SWI~5W4 - Sui Nochi patent applicant Kyokuto Kaihatsu Kogyo Co., Ltd.

Claims (1)

[Claims] (1) In a work vehicle that has a boom operating device such as a swing motor, a hoisting cylinder, and a telescopic cylinder that displaces the boom, and also has an outrigger operating device that operates outriggers to fix the vehicle body, a boom operating circuit or an outrigger operating circuit. A three-position electromagnetic control switching valve is provided to switch the supply of working fluid to the outrigger operating circuit. A switch that is activated when the 3-position electromagnetic control switching valve is detected is inserted in series with the solenoid energizing circuit of one of the three-position electromagnetic control switching valves, and a switch that is activated when the switching valve that is inserted between the A switch that operates when it is detected that the vehicle body is not fixed by the outriggers, and a switch that operates when the fixation of the vehicle body by the outrigger is detected are interposed in series in the other solenoid energizing circuit of the three-position electromagnetic control switching valve. A boom and ara 1 to rig operation operating device in a working vehicle with a boom.