JPS6317721B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention improves work efficiency by emitting a sound every time a platform passes a rack when raising and lowering the platform on an order picking truck. The present invention relates to a platform stop position warning device for an order picking truck with a raised height.

Generally, the order picking track is 2 to 10
It is necessary to work on a rack about the size of a step and stop the platform at the desired rack position. Therefore, during picking operations, the operator must determine the stopping position and the timing to release the raising or lowering pushbutton by judging from the condition of the side racks that the platform passes while raising or lowering. You have to use the sacred diameter.

The purpose of the present invention is to reduce the burden on the driver as described above and improve work efficiency, and each time the platform passes a rack, a sound is emitted to notify the driver. The present invention provides a device that warns of a stop position.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 shows an overall layout of the present invention. In the figure, 1 is the most typical order picking truck, 2, 3, and 4 are the floor plate, bottom plate, and side plate of the platform, 5 is a photoelectric switch, and 6 is a mounted pallet. The photoelectric switch 5 is mounted on the side plate 4 on the bottom plate 3 of the platform.
It is installed facing the side plate 4, and irradiates and receives a luminous flux through a hole bored in the side plate 4. Details of its installation and operation will be described later. Reference numerals 7 and 8 designate a raising push button and a lowering push button, respectively, which are arranged on the platform operation panel, and 9 and 10 represent the horizontal and vertical beams of the facing racks, respectively.
Reference numeral 11 denotes a reflecting plate provided over the entire length of the horizontal beam 9, and has an upper reflecting surface 11a and a lower reflecting surface 11b facing the front in a dogleg shape.

FIG. 2 shows the details of mounting the photoelectric switch 5, with A being a side view and B being a front view. The photoelectric switch 5 is fastened to a mounting bracket 12 with bolts 13, one end 14 of the mounting bracket 12 is rotatably mounted on the bracket 16 with a pin 15, and the other end 17 is rotatably mounted with a pin 18. It is rotatably attached to a piston rod 20 of a solenoid 19 having a stroke S, and the bracket 16 and solenoid 19 are fixed to the bottom plate 3 of the driver's seat. In the above configuration, when the solenoid 19 is energized, the piston rod 20 extends upward by a stroke S, the photoelectric switch 5 is tilted upward by α°, and the irradiation angle shifts from a depression angle to an elevation angle.

FIG. 3 shows the electrical circuitry that controls this device. 7 is a push button switch for raising, which is normally open and automatically returns, and an electromagnetic contactor 21 connected to it.
When the contactor 21a turns on, the pump motor 22 operates to send high pressure oil to the lift cylinder and the platform rises. The platform then stops when the lift pushbutton switch 7 is released. 8 is a push button switch for lowering, which is normally open and automatically returns; when the hydraulic circuit solenoid valve 23 connected to this is turned on, the oil in the lift cylinder is returned to the oil tank, and the platform is lowered. . The platform then stops when the lowering pushbutton switch 8 is released. In this embodiment, a solenoid 19 is arranged in parallel with an electromagnetic contactor 21 as shown in the figure in a typical order picking circuit as described above. In such a circuit, when the lift push button 7 is closed, the solenoid 19 is energized and the photoelectric switch 5 is tilted upward during the lift, and when the lift push button 7 is open, i.e. When no work is being done or during the descent, the solenoid 19 is not energized and the photoelectric switch 5 remains tilted downward.

Furthermore, in this embodiment, a circuit for a photoelectric switch 5 is arranged in parallel with the lift push button switch 7.
In this circuit, T ₁ is a timer that starts sounding the buzzer 24, and T ₂ is a timer that ends sounding the buzzer 24. When the photoelectric switch 5 is turned on, the timer T ₁ ,
When _T2 is energized and timer _T1 is activated, the time limit contact 25 for _T1 is closed and the buzzer 24 begins to sound.
After an appropriate period of time, when timer T ₂ is activated,
Momentary contact 26 for _T2 is disconnected. When timer T ₂ expires, time limit contact 27 for T ₂ is disconnected, timers T ₁ and T ₂ are cut off, the buzzer 24 stops sounding, and timer T ₂ returns to its original state. In this way, when the photoelectric switch 5 is turned on, the buzzer emits a sound to notify the driver.

FIG. 4 is a diagram showing the state of light reflection while the platform is rising and falling. When the platform is rising, the photoelectric switch 5 tilts upward and lifts the vertical items 2 stored in the rack.
Even if light is irradiated on 8, it is not reflected on the photoelectric switch.The state diagram shows that the light is not reflected on the photoelectric switch 5 while it is rising in the same state as above. The state diagram shows that while the platform is descending, the photoelectric switch 5 tilts downward, and even if light is irradiated onto the vertical article 29 stored in the rack, it will not be reflected on the photoelectric switch. This is a state diagram in which the irradiated light is reflected by the upper reflective surface 11a of the reflector plate and the photoelectric switch 5 is made sensitive when it reaches the rack while descending in the same state as above.

Next, as shown in FIG. 5, a case where the present invention is applied to a widely used rack 30 having a trapezoidal end section will be described. in this case,
When the platform is raised, face 31 of rack 30
Set the elevation angle of the photoelectric switch so that it is perpendicular to. Also, when the platform is lowered, the rack 3
The depression angle of the photoelectric switch is set to be perpendicular to the 0 plane 32.

is the general position when ascending, and shows a state in which there is no misrecognition even if the irradiated light hits the vertical surface 33 of the object in the rack. 2 shows a state in which the photoelectric switch 5 is turned on as the irradiated light is reflected by the surface 31 of the rack. is the general position when descending, and shows a state where even if the irradiated light hits the vertical surface 34 of the object in the rack, it will not be misidentified. is surface 3 where the irradiation light is easy.
2, the photoelectric switch 5
Indicates the ON state.

As mentioned above, in such cases,
Since the end face of the rack acts as a reflective surface, there is no need to install a reflective plate on the rack as in the previous embodiment, which is extremely practical.

As described above, in the device of the present invention, when the driver completes work on a certain rack and moves the platform to the next desired rack position, the operator presses the raising or lowering pushbutton. After that, the platform can be stopped at the desired rack position by releasing the push button the moment the buzzer stops sounding for the difference in the number of steps to the desired rack. The apparatus of the present invention can be applied even when there are several racks to be worked on, and the height intervals between the racks are different. Further, in the case of a rack in which the horizontal component of the rack can be inserted at any height, the insertion height can be changed while the reflective plate is attached. In particular, in the device of the present invention, since the photoelectric switch is used with the photoelectric switch tilted upward or downward, it is possible to prevent malfunctions caused by objects stored in a rack. That is, although almost all metal containers and metal utensils include vertical surfaces, malfunctions can be prevented when working with the racks that house them. Therefore, in such a case, the effect of the device of the present invention is significant. Furthermore, unlike conventional order picking trucks in which the driver must always be aware of the stop position when raising and lowering the truck, the device of the present invention notifies the driver by emitting a buzzer every time the truck passes a truck. This reduces the driver's mental fatigue and allows the platform to be efficiently stopped at a predetermined position, improving work efficiency and eliminating the need for inching operations to adjust the stopping position. It can be significantly reduced, and the life span of lifting equipment can be significantly increased.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall arrangement of the device of the present invention;
Figure 2 shows details of photoelectric switch installation.
A is a side view, B is a front view, Fig. 3 is an electric circuit diagram for controlling the device of the present invention, Fig. 4 is an explanatory diagram showing the state of light reflection when the platform is rising and falling, and Fig. 5 is an illustration. FIG. 6 is an explanatory diagram showing the state of light reflection when the platform is rising and falling with respect to a rack whose end face is trapezoidal. 3: Platform bottom plate, 4: Platform side plate, 5: Photoelectric switch, 7: Up button, 9: Side beam, 11: Reflector plate, 11a: Upper reflective surface, 11b: Lower reflective surface, 19: solenoid.

Claims (1)

[Claims] 1. A reflective plate 11 having a dogleg shape with an upper reflective surface 11a and a lower reflective surface 11b facing forward is installed over the entire length of the horizontal beam 9, and is operated in conjunction with closing the upward push button 7. A photoelectric switch 5 that changes the irradiation angle from an angle of depression to an angle of elevation by a solenoid 19 is installed on the platform bottom plate 3, and a light beam is irradiated onto the reflector plate 11 through a hole drilled in the side plate 4, and when the angle of irradiation is an angle of depression, The photoelectric switch 5 is actuated by the light reflected from the upper reflective surface 11a, or by the light reflected from the lower reflective surface 11b when the irradiation angle is at an elevation angle, and the buzzer emits a sound when the photoelectric switch 5 is activated. A platform stop position warning device for an order picking truck, characterized in that: