JPH0724398Y2 - Steering warning device for aerial work vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a device for issuing an alarm when the turning position of a steering lever or a handle does not coincide with a wheel.

(B) Conventional technology Conventionally, a work platform for aerial vehicles operated by one lever has been known. These are constructed such that when the steering lever is rotated, the wheels are rotated in the traveling direction by an actuator such as a motor or a hydraulic cylinder. Then, in order to avoid danger, the vehicle travels from the time when the turning direction of the steering lever and the direction of the wheels match.

(C) Problems to be solved by the invention However, if the steering lever rotation direction and the wheel direction are the same and the steering lever is rotated in that direction, there is no problem of simultaneous running, but When the direction of rotation of the direction lever is different from the direction of the wheels, the timing is deviated between the operation and the start of steering, and it is not known when the vehicle will start. Therefore, the steering lever starts to move suddenly a little after turning, which may cause a danger not only to the operator but also to people around him.

(D) Means for Solving the Problem The present invention has the following configuration in view of such a point.

In a steering device for an aerial work vehicle, a steering section is provided with a sensor for detecting a traveling direction at a rotation base of a steering lever, and an actuator is operated according to a value of the sensor to rotate a steering drive wheel. An angle sensor for detecting the direction of the steering drive wheel is arranged in the steering wheel, and an alarm is issued during steering operation until the steering lever turning direction coincides with the steering drive wheel direction.

(E) Embodiment of the Invention The purpose of the present invention is as described above, and the configuration of the embodiment shown in the accompanying drawings will be described.

FIG. 1 is an overall side view of an aerial work vehicle, and FIG. 2 is a hydraulic circuit diagram.

The aerial work vehicle has a scissor-link type lifting device C interposed between a trolley B and a workbench A so that the workbench A can be raised and lowered.

The configuration of the trolley B is such that the drive steering wheels 11 and the caster wheels 12 are arranged in the front part of the lower frame 1, the drive steering wheels 14 and the caster wheels 15 are arranged in the rear part, and the drive steering wheels 11 and 14 and the caster wheels are arranged. 12
・ 15 are arranged diagonally.

The drive steering wheels 11 and 14 are driven by hydraulic motors 23 and 24, respectively, and are steered and rotated by steering cylinders 4 and 5,
The caster wheels 12 and 15 are rotated by following the traveling direction by the rotation of the drive steering wheels 11 and 14.

The lifting device C provided on the trolley B is composed of lower scissor links 6a and 6b, intermediate scissor links 7a and 7b, and upper scissor links 8a and 8b, and is intermediate between the lower end of the upper scissor link 8a and the upper end of the lower scissor link 6a. A scissor link 7a is pivotally supported, an intermediate scissor link 7b is pivotally supported at the lower end of the upper scissor link 8b and the upper end of the lower scissor link 6b, and the center of each scissor link is pivotally supported by a pivot shaft.

A sliding roller is pivotally supported at one lower end of the lower scissor link 6a so as to be slidable back and forth within a sliding rail fixed on the lower frame 1, and the other scissor link 6b.
The lower end is pivotally supported on the front part of the lower frame 1. An elevating hydraulic cylinder 2 is interposed between the lower scissor links 6a and 6b, and when it is extended, it opens in an X-shape and can be elevated. The scissor links 6, 7, 8 and the hydraulic cylinder 2 are provided as a left and right pair.

A sliding roller is also provided on the upper end of one upper scissor link 8a of the upper scissor links 8a and 8b.
It is slidable on a slide rail fixed to the lower surface of the upper frame 20, and the upper end of the other upper scissor link 8b is pivotally supported on the lower end of the upper frame 20.

The operation box 19, the battery 16, the hydraulic oil tank, the charging charger 17 and the like are arranged on both sides of the lower frame 1, and the drive motor M is arranged in the center. As shown in FIG. 3, the battery 16 drives a drive motor M to supply electric power to the control circuit 21 and the like, while the charging charger 17 enables charging. That is, as shown in FIG. 4, by inserting the charging plug 25 into the household outlet 26, the battery 16 can be charged by being supplied with electric power, and the contact 27 is opened during the charging to open the relay. Since 28 is turned off, the contact 28a is also turned off, and electric power is not supplied to the control circuit 21 and the like, so that the drive motor M cannot be driven. Therefore, even if the traveling lever is accidentally rotated, the aerial work vehicle does not move, damage to the charging plug 25, wiring, etc. is eliminated, and other accidents can be prevented. 29 is a power lamp and 30 is a key switch.

Hydraulic pumps P1 and P2 are fixedly mounted on the drive shaft of the drive motor M, and oil is sent from the hydraulic pump P1 to the hydraulic cylinders 2.2 of the lifting device via the solenoid proportional valve 45, and the solenoid proportional valve 45. The solenoid proportional valve 45 is expanded and contracted by switching
・ The oil is sent to the hydraulic motors 23 and 24 of the drive steering wheels 11 and 14 via 42. When the high / low switching valve 46 is switched from the hydraulic pump P2, hydraulic oil is supplied to the hydraulic cylinders 2.2 and the hydraulic motors 23/24 to enable high speed traveling / high speed ascent.
35 is a brake release valve, 36 and 37 are bypass valves, which are provided in the vicinity of the operation box 19 provided on the carriage B,
It is released when towing.

Then, pressure oil is supplied to the steering cylinders 4 and 5 via the electromagnetic switching valves 43 and 44 to enable the steering. That is, as shown in FIG. 5, the structure of the steering section is such that the front axle 3a and the rear axle 3b fixed to the lower frame 1 are provided with king pins 54, 54, the bases of the hydraulic cylinders 4, 5 and the arms 53a, 53b, respectively. The base is pivotally supported, the knuckle arm 55 and the tie rod 56 are pivotally connected between the kingpin 54 and the arm 53a, and the piston rods 4a and 5a of the hydraulic cylinders 4 and 5 are pivotally connected to the tips of the arms 53a and 53a. Hydraulic cylinder 4
By extending and contracting 5, the drive steering wheels 11 and 14 can be rotated. The rotation angles of the drive steering wheels 11 and 14 are detected by the angle sensors 9 and 10 provided on the rotation base of the arm 53.

When steering is performed, there are three modes. A front wheel steering mode in which only the front drive steering wheel 11 is rotated by the hydraulic cylinder 4 to perform steering, and front and rear drive steering wheels 11 and 14 are simultaneously operated. A diagonal mode in which steering is performed by rotating in the same direction, and a lateral S in which one of the front and rear drive steering wheels 11 and 14 is rotated at a right angle and the other is steered to perform a pivot turn. There is a character mode, and as shown in FIG. 7, it can be switched by the changeover switch 49 provided on the operation boxes 19 and 22, and the mode is displayed by the lamps 50, 51 and 52.

In addition, a potentiometer is provided at the base of the steering lever 38 on the operation boxes 19 and 22 as a sensor for detecting the turning direction.
38a and 38b are arranged to detect the amount of rotation in the vertical and horizontal directions, input to the control circuit 21 as shown in FIG. 6 to calculate the traveling direction, and the electromagnetic switching valve 43. The drive steering wheels 11 and 14 are rotated by operating 44, and the amount of rotation is fed back by the angle sensors 9 and 10.

The present invention is directed to the turning direction of the steering lever 38 and the driving steering wheel 11.
The alarm is issued until the turning directions of 14 coincide with each other. The changeover switch 49 is switched to any one of the front wheel steering mode, the oblique traveling mode and the lateral S-shaped mode, and at that time, the lamps 50 and 51 in that mode. When 52 is turned on and the steering lever 38 is turned to perform a steering operation, the turning direction is output by the potentiometers 38a and 38b.
The 14 directions are output by the angle sensors 9 and 10. When the values of the potentiometers 38a and 38b and the angle sensors 9 and 10 do not match, the buzzer 32 sounds and the lamp blinks to give an alarm.

Then, when the driving steered wheels 11, 14 are rotated to coincide with the direction of the steering lever 38, the buzzer 32 stops ringing, the lamp turns on and the vehicle starts traveling.

(F) Effects of the Invention With the above-mentioned configuration, the invention has the following effects.

First, the warning is issued while the direction of the steering lever and the direction of the steering drive wheels do not match, so that the operator can prepare and wait until the start of traveling so that the operator can start suddenly. It is possible to avoid the danger even if there are people around.

Secondly, the existing configuration can be used as it is, and the alarm device can be configured only by improving the software of the control circuit, and the safety can be improved at low cost.

[Brief description of drawings]

Fig. 1 is a side view of the whole aerial work vehicle, Fig. 2 is a hydraulic circuit diagram,
FIG. 3 is a power supply circuit diagram, FIG. 4 is a perspective view showing a charging state,
FIG. 5 is a plan view showing the structure of the steering apparatus, FIG. 6 is a control block diagram, and FIG. 7 is a drawing showing an operation box. 4.5 Hydraulic cylinder 9.10 Angle sensor 21 Control circuit 32 Buzzer 38 Steering lever 38a / 38b Potentiometer 50/51/52 Lamp

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideaki Noguchi, 428, Enami, Okayama, Okayama Prefecture, Seirei Industry Co., Ltd. Within

Claims (1)

[Scope of utility model registration request] 1. A steering device for an aerial work vehicle in which a sensor for detecting a traveling direction is provided on a rotation base of a steering lever, and an actuator is operated according to a value of the sensor to rotate a steering drive wheel. In the above, in the steering section, an angle sensor for detecting the direction of the steering drive wheel is arranged, and at the time of steering operation, it is configured to issue an alarm until the steering lever rotation direction and the steering drive wheel direction match. A steering warning device for aerial work vehicles.