JP3928780B2 - Picking lift - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a picking lift including a work table that can be raised and lowered.
[0002]
[Prior art]
A picking lift is a cargo handling vehicle used to perform a picking work in a rack or the like provided in a warehouse.For example, when an operator operates an operation unit provided on a work table that can be raised and lowered at the rear of a vehicle body, The vehicle can be run or the work table can be raised and lowered.
[0003]
Further, a picking lift for performing picking work at a high place is provided with a guard for preventing the operator from falling down so as to surround the work table. The guard is provided so as to be openable and closable so that an operator can easily get on and off the workbench, and the picking operation is performed with the guard open.
[0004]
[Problems to be solved by the invention]
In some cases, the picking operation is performed in a dimly lit warehouse. In such a case, the worker cannot see the outer edge of the floor of the work table well, and there is a risk that the worker will step on the work table. At this time, since the guard is opened, the guard cannot protect the worker.
[0005]
The present invention has been made in view of the above problems, and it is an object of the present invention to allow a worker to easily and clearly recognize the outer edge of the floor portion of the workbench so that the picking work can be performed safely. And
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention includes a workbench that can be raised and lowered along a mast erected on a vehicle body , and a guard that can be opened and closed on the workbench and protects an operator . In the picking lift, a light emitting device provided along an outer edge of the floor of the work table, occupant detection means for detecting the presence or absence of a worker on the work table, and a lift height for detecting the lift of the work table A detecting means; an open / close detecting means for detecting an open / closed state of the guard; and an occupant detecting means for detecting that an operator is on the work table; and And a control device that turns on the light emitting device when it is detected that the lift is equal to or higher than a predetermined height and the guard is opened by the open / close detection means.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the picking lift is mainly disposed in a vehicle body 1, a mast 2 erected on the rear of the vehicle body 1, a work table 3 that can be moved up and down along the mast 2, and a lower part of the work table 3. Fork 4.
[0008]
As shown in FIG. 1, a traveling device (not shown) for traveling a vehicle including front wheels and the like is arranged at the center of the front portion of the vehicle body 1. A control device 5 (not shown) for controlling is arranged, and a hydraulic device (not shown) for raising and lowering the work table 3 and the like is arranged on the right side of the same view. In addition, a pair of right and left rear wheels are arranged at the rear of the vehicle body 1, and the picking lift of this embodiment includes one front wheel and two rear wheels. Furthermore, a battery 6 is mounted at a substantially central position in the front and rear of the vehicle body 1 as a driving source such as a traveling device and a hydraulic device.
[0009]
The traveling device includes a drive unit having a motor and a rotatable front wheel. When the front wheel is rotated by the drive unit, the vehicle travels at a speed corresponding to the rotation, and when the rotation is stopped, the vehicle stops. . In addition, so-called steering is performed in which the traveling direction of the vehicle is changed by changing the direction of the front wheels by the drive unit.
[0010]
As shown in FIG. 2, the mast 2 includes a pair of left and right outer masts 21 supported by the vehicle body 1, a pair of left and right inner masts 22 that can be moved up and down along the inner side of the outer mast 21, and a pair of left and right. The lift cylinder 23 is extendable and includes a pair of left and right chains (not shown) having one end connected to the outer mast 21 and the other end connected to the work table 3. The upper part of the lift cylinder 23 is in contact with the lower part of the beam 221 joined so as to connect the upper parts of the left and right inner masts 22, and thereby the inner mast 22 moves up and down in conjunction with the expansion and contraction of the lift cylinder 23. The chain is suspended by a rotatable pulley (not shown) provided at the lower part of the beam 221, whereby the work table 3 is raised and lowered in conjunction with the raising and lowering of the inner mast 22.
[0011]
When hydraulic oil is supplied from the hydraulic device to the lift cylinder 23, the lift cylinder 23 extends and pushes up the inner mast 22. As the inner mast 22 rises, the chain on the work table 3 side is pulled up via the pulley, and the work table 3 and the fork 4 also move up. Conversely, when the hydraulic oil is returned from the lift cylinder 23 to the hydraulic device, the lift cylinder 23 is shortened, and the inner mast 22, the work table 3, and the fork 4 are lowered.
[0012]
As shown in FIG. 1, the work table 3 is constructed from a horizontal floor 3a for an operator to stand on, a wall 3b to which an operation unit 31 and the like to be described later are attached, and a fallen object from above. It is made up of a ceiling portion 3c that protects a person and has a substantially U-shape in side view. Further, the work table 3 is arranged such that the wall 3 b faces the front of the vehicle and the front of the wall 3 b is along the inner mast 22. A pair of left and right forks 4 are fixed to the lower part of the floor 3 a so as to protrude rearward of the vehicle, and the forks 4 are lifted and lowered integrally with the work table 3.
[0013]
As shown in FIG. 3, a light emitting device 7 having a substantially U-shape in plan view is provided on the outer edge of the floor 3a. As shown in FIG. 4, the light emitting device 7 includes an LED 8 disposed so that the light emitting portion faces upward and a socket 9 that holds the LED 8 and is embedded in the floor portion 3 a. A semi-transparent or transparent resin cover 10 is provided above the light emitting device 7 so as to cover the light emitting device 7. The socket 9 and the battery 6 mounted on the vehicle body 1 are connected by a power supply wire (not shown), and the power is supplied to the LED 8 through the power supply wire, so that the LED 8 is lit.
[0014]
As shown in FIG. 2, the operation part 31 is provided in the upper-lower approximate center of the wall part 3b, and the substantially U-shaped guard 32 in plan view is attached to the wall part 3b at both ends thereof. A pair of left and right auxiliary guards 33 that can be opened and closed are provided so as to protrude rearward from the left and right ends of the wall 3b. Accordingly, an operator who is on the floor 3a with the guard 32 and the auxiliary guard 33 closed closes the front by the wall 3b, the rear by the guard 32, both the left and right by the guard 32 and the auxiliary guard 33, and the upper part by the ceiling. It is protected by the part 3c. Further, an occupant detection switch 11 serving as an occupant detection means for detecting whether or not the driver has boarded the floor 3a is disposed below the operation unit 31.
[0015]
The occupant detection switch 11 includes a pyroelectric infrared sensor. When the worker is on the floor 3a, the occupant detection switch 11 senses infrared rays emitted from the worker's body and is turned on. When not on board part 3a, it is OFF. That is, the occupant detection switch 11 outputs a detection signal based on the ON / OFF signal.
[0016]
As shown in FIG. 1, the operation unit 31 includes a disc-shaped handle 311 disposed on the left side when viewed from the front, a cylindrical grip 312 disposed on the right side of the same view, and a button 313 disposed at the base of the grip 312. 314. The handle 311 and the grip 312 are for an operator to perform a traveling operation. The steering is performed by rotating the handle 311 and the traveling speed is adjusted by rotating the grip 312. The buttons 313 and 314 are for the operator to perform a cargo handling operation. When the button 313 is pressed, the work table 3 is raised, and when the button 314 is pressed, the work table 3 is lowered. When the operator operates the grip 312 and the work table lifting / lowering buttons 313 and 314, the picking lift travels at a speed corresponding to the operation amount, and the work table 3 moves up and down.
[0017]
As shown in FIG. 5, both ends of the guard 32 are formed in a cylindrical shape, and have through holes provided in the left-right direction of the vehicle. A pin 34 is fixed to the wall 3b of the work table 3 through the through hole, and the guard 32 is rotatable about the pin 34. Therefore, the guard 32 can be opened by rotating it upward and closed by rotating it downward. The auxiliary guard 33 also has an opening / closing mechanism similar to the guard 32.
[0018]
A protrusion 32a is formed at one end of the guard 32 so as to protrude downward with the guard 32 closed, and the opening / closing detection switch 12 provided below the guard 32 is turned ON / OFF by the protrusion 32a. The guard protrusion 33a and the opening / closing detection switch 12 constitute an opening / closing detection means. When the guard 33 is opened, the opening / closing detection switch 12 is OFF. However, when the guard 33 is closed, the opening / closing detection switch 12 protrudes. It is turned on by being pushed by 33a. That is, the open / close detection switch 12 outputs a detection signal by an ON / OFF signal. The open / close detection switch 12 is arranged to be turned on when the guard 33 is completely closed and in the lowest position.
[0019]
Further, as shown in FIG. 2, a lifting height detection switch 13 is attached to the rear side surface of the inner mast 22, and a substantially rectangular parallelepiped dog for turning on / off the lifting height detection switch 13 on the rear side surface of the outer mast 21. 14 is fixed to the inner mast 22. The lift detection switch 13 and the dog 14 constitute a lift detection means. The lift of the current inner mast 22 is the lift of the inner mast 22 when the lift of the work table 3 is a predetermined height. It is detected whether it is above. That is, it is detected indirectly whether or not the lift height of the work table 3 is equal to or higher than a predetermined height. When the lift height of the work table 3 is less than a predetermined height, the lift height detection switch 13 is not pushed by the dog 14 and is OFF. However, when the lift height of the work table 3 exceeds a predetermined height, the lift height detection switch 13 is Pressed by the dog 14 to turn ON. That is, the lift height detection switch 13 outputs a detection signal by an ON / OFF signal, and the lift height detection switch 13 is turned on by the fixed position height and the vertical length of the dog 14. Lifting height is set. In addition, the predetermined height here is a height at which there is no danger to the operator due to falling.
[0020]
As shown in FIG. 6, the control device 5 controls lighting / extinguishing of the LED 8 based on ON / OFF signals from the occupant detection switch 11, the open / close detection switch 12, and the lift detection switch 13. Here, the occupant detection switch 11, the open / close detection switch 12, and the elevation detection switch 13 output predetermined detection signals as the work table detection device 15 in the present invention. Hereinafter, the control by the control device 5 will be further described with reference to the flowchart shown in FIG.
[0021]
The control device 5 first determines whether or not an ON signal is output from the occupant detection switch 11 (step S1). If the occupant detection switch 11 is OFF, the operator is not on the work table 3, and therefore the worker does not step on the work table 3, so that the process proceeds to step S2 and the LED 8 is turned off. . If it is determined in step S1 that an operator is on the work table 3 and the occupant detection switch 11 is ON, the process proceeds to step S3.
[0022]
In step S3, it is determined whether or not an ON signal is output from the open / close detection switch 12. If the open / close detection switch 12 is ON, the operator on the work table 3 is protected by the closed guard 32 and does not step on the work table 3, so the process proceeds to step S2 to turn off the LED 8. . If the guard 32 is opened and the open / close detection switch 12 is OFF in step S3, the process proceeds to step S4.
[0023]
In step S4, it is determined whether or not an ON signal is output from the lift detection switch 13. If the lifting height detection switch 13 is OFF, the lifting height of the work table 3 is a height that does not cause the operator's danger due to falling, and therefore the process proceeds to step S2 to perform the process of turning off the LED 8. If the lift of the work table 3 is equal to or higher than the predetermined height and the lift detection switch 13 is ON in step S4, it is dangerous for the operator to step off the work table 3, so the process proceeds to step S5. Then, the process of turning on the LED 8 is performed.
[0024]
As described above, in the present embodiment, when there is a risk of danger to the worker, the process of turning on the LED 8 is performed so that the worker can recognize the outer edge of the floor 3a of the work table 3. The worker can safely perform the picking work and can concentrate on the work with peace of mind. In addition, when there is no risk of danger to the operator, the process of turning off the LED 8 is performed, so that useless power consumption can be prevented.
[0025]
Furthermore, since the LED 8 is used for the light emitting device 7 in the present embodiment, the power consumption can be suppressed, so that it is possible to cope with lighting for a long time. Further, when a high-brightness LED is used as the LED 8, not only the operator can recognize the outer edge of the floor 3a of the work table 3 by lighting, but also the operator's feet can be illuminated.
[0026]
Further, in the present embodiment, the light emitting device 7 is embedded in the floor 3a and the cover 10 covering the light emitting device 7 is provided, so that there is no possibility that the operator steps on the light emitting device 7 and breaks it, and further, dust, dust, etc. It is also possible to prevent the failure of the light emitting device 7 due to the above. Since the cover 10 is made of a translucent or transparent resin, the cover 10 does not block the light from the light emitting device 7.
[0027]
The occupant detection means, the open / close detection means, and the lift height detection means in the present invention are not limited to the above-described embodiment. For example, as a boarding detection means, a tactile sensor (for example, a belt-like pressure sensor) is provided on the upper surface of the floor 3a, and the operator detects that the driver is stepping on the pressure sensor, whereby the operator can detect the floor 3a. You may be made to detect having boarded. Further, the open / close detection means may detect the angle of the guard 32 using a rotary potentiometer or the like and determine the open / close state based on the value. Further, the lifting height detecting means includes, for example, a lifting height detection switch 13 attached to the front side of the work table 3, that is, the side surface on the mast 2 side, and a dog 14 fixed to the rear side surface of the outer mast 21. Alternatively, it may be directly detected whether or not the lift height of the work table 3 is equal to or higher than a predetermined height.
[0028]
In addition, the light emitting device in the present invention is not limited to the above-described embodiment, and may be, for example, a light emitting device using a light bulb or a fluorescent lamp, and a power source (for example, a dry battery) is built in the light emitting device itself. It may be.
[0029]
The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.
[0030]
【The invention's effect】
According to the present invention , by turning on the light emitting device, the driver can clearly recognize the outer edge of the floor portion of the work table, and can perform the picking work safely.
[0031]
Particularly, since the light emitting device is turned on when the boarding of the worker is detected, the worker on the work table can surely recognize the outer edge of the floor portion of the work table. Further, when the worker is not on the work table, the light emitting device is turned off, so that unnecessary power consumption can be prevented.
[0032]
In particular, since the light emitting device is turned on when the height of the workbench rises above a predetermined value, an operator who performs a picking work at a high place can reliably recognize the outer edge of the floor part of the workbench. Further, since the light emitting device is turned off when the height of the work table is lower than a predetermined value, useless power consumption can be prevented.
[0033]
In particular, since the light emitting device is turned on when the guard is opened, an operator who performs the picking work with the guard opened can reliably recognize the outer edge of the floor portion of the work table. Further, since the light emitting device is turned off in a state where the guard is closed and the worker is protected by the guard, wasteful power consumption can be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a picking lift according to an embodiment of the present invention.
FIG. 2 is a perspective view showing each detection means as one embodiment of the present invention.
FIG. 3 is an exploded perspective view showing the vicinity of a floor portion of a work table as one embodiment of the present invention.
FIG. 4 is a cross-sectional view showing an outer edge portion of a floor portion of a work table as one embodiment of the present invention.
FIG. 5 is a plan view showing opening / closing detection means as one embodiment of the present invention.
FIG. 6 is a block diagram illustrating a control device as one embodiment of the present invention.
FIG. 7 is a flowchart illustrating a control device as one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Car body 2 Mast 3 Worktable 3a Floor part 5 Control apparatus 7 Light-emitting device 8 LED
9 Socket 11 Occupant detection switch 12 Open / close detection switch 13 Lifting height detection switch 14 Dog 15 Worktable detection device 32 Guard 32a Protrusion 33 Auxiliary guard

Claims (1)

In a picking lift comprising a worktable that can be raised and lowered along a mast erected on a vehicle body , and a guard that is provided on the worktable so as to be openable and closable and protects an operator ,
A light emitting device provided along an outer edge of the floor of the work table ;
Occupant detection means for detecting the presence or absence of an operator on the work table;
A lift detection means for detecting the lift of the workbench;
Open / close detecting means for detecting an open / closed state of the guard;
The occupant detection means detects that an operator is on the work table, and the lift height detection means detects that the lift height of the work table is greater than or equal to a predetermined value, and the open / close detection A picking lift comprising: a control device that turns on the light emitting device when the means detects that the guard is open .

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