JPH05229793A - Attachment mechanism with rotary device in forklift - Google Patents

Abstract

PURPOSE:To carry out a safe and adequate loading work by controlling a pressurized oil supply direction so that a rotary part can rotate clockwise when a lever for attachment slants to the right side and rotate counterclockwise when it slants to the left side and exerting a notice means when a rotary position reaches an adequate loading position. CONSTITUTION:A lever 25 for attachment, an electro-magnetic control valve 22, an angle position detection switch SW1 for detecting that the rotary position of a roter 15 is positioned in a position capable of proper loading by a work structure 19 and a notice lamp 30 for informing a loadable status to a worker are provided. A pressurized oil supply direction by the electro-magnetic control valve 22 is controlled so that a roter 15 can rotate clockwise when the lever 25 for attachment slants to the right side and rotate counterclockwise when it slants to the left side and the notice lamp 30 is exerted by a controller 26 when the angle position detection switch SW1 detects that the rotary position reaches the adequate loading position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment mechanism with a rotating device in a forklift truck, which is devised so that cargo handling work can be carried out safely and efficiently.

[0002]

2. Description of the Related Art A forklift truck is an industrial vehicle for loading and unloading, which is provided with a mast for raising and lowering loaded loads in front of a vehicle body so that it can be moved from place to place.

FIG. 4 is a perspective view showing an example of a standard forklift. As shown in the figure, the lift cylinder 1
Is fixed to the pair of left and right outer masts 2, and the pair of left and right inner masts 3 is moved up and down with the outer mast 2 as a guide as the piston rod 1a expands and contracts. The outer mast 2 is fixed to the vehicle body 4 in front of the vehicle body 4. As a result, as the inner mast 3 moves up and down, the bracket 5 suspended on a chain (not shown in FIG. 4) and the fork 6 for directly carrying luggage are loaded.
The elevating part consisting of is moved up and down.

More specifically, as conceptually shown in FIG. 5, the fork 6 has its base end fixed to the bracket 5 and protrudes forward, and is suspended on the chain 7 integrally with the bracket 5. is there. The chain 7 is suspended on a chain wheel 8 rotatably supported on the inner mast 3, and one end is fixed to the bracket 5 and the other end is fixed to the outer mast 2.

Thus, the bracket 5 and the fork 4, which are the ascending / descending portion, not only rises as the inner mast 3 rises, but also the chain wheel 8 rises with respect to the fixed portion (outer mast 2) so that the inner mast 3 The relative position to rises. That is, the amount of ascent of the ascending / descending portion with respect to the ground surface is defined by the length of the chain 7 in proportion to the ascending amount of the inner mast 3, and the ascending / descending inner mast 3
It is the amount including the amount of relative increase to.

Although the above-mentioned forklift is of a standard type, this forklift is generally adapted to be attached with various attachments according to the shape of the load to be conveyed. As one type of this kind of attachment, there is a so-called attachment with a rotating device.

Specific examples of the attachment with a rotating device include a rotating fork and a rotating roll clamp, and the working mechanism (fork, roll clamp, etc.) rotates 360 ° by the operation of the rotating device. This attachment with a rotating device is suspended by a chain of a forklift and lifted up and down.

[0008]

When carrying out cargo handling using an attachment with a rotating device, if cargo handling is attempted at a rotational position other than an angle at which cargo handling can be carried out properly, the cargo may be damaged or dangerous. Or However, in the past, the rotating position of the work mechanism was visually checked by the operator, so there is a risk of making a mistake in checking and damaging the load, and the worker is tired due to the checking work, further reducing work efficiency. There was a problem.

The present invention has been made in view of the above prior art, and an object of the present invention is to provide an attachment mechanism with a rotating device in a forklift which can carry out cargo handling safely and reliably.

[0010]

The structure of the present invention for solving the above-mentioned problems is provided in a rotating device having a rotating portion which is moved up and down on the front surface of a vehicle body and which is rotated by supplying pressure oil, and the rotating portion. In the attachment with a rotating device of the forklift, which includes a working mechanism, an attachment lever that is tilted rightward or leftward from the neutral position, and pressure oil that is supplied to the rotating device to change the rotating direction of the rotating portion. Of the electromagnetic control valve for switching the supply direction of the, the angular position detection switch for detecting that the rotation position of the rotating portion is located at a position where the work mechanism can properly carry the cargo, and a state that the worker can carry the cargo. Notifying means for notifying, and controlling the pressure oil supply direction by the electromagnetic control valve so that the rotating portion rotates clockwise when the attachment lever tilts to the right, When the attachment lever is tilted to the left side, the electromagnetic control valve controls the pressure oil supply direction so that the rotating portion rotates counterclockwise, and when the angle position detection switch detects that the cargo handling position has been reached, the notification is issued. And a controller for operating the means.

[0011]

When the rotating position of the rotating portion of the rotating device reaches a position where the working mechanism can carry out appropriate cargo handling, this is detected by the angular position detection switch, and the notifying means is activated,
The worker knows that the cargo can be handled.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 shows a control system of an embodiment of the present invention, and FIG.
Shows the control system and hydraulic circuit system of the embodiment. As shown in the figure, the attachment 10 with a rotating device comprises a rotating device 16 including a hydraulic motor 11, a worm 12, a worm wheel 13, a spur gear 14, and a rotor 15, and a working mechanism (fork, roll clamp, etc.) 19. Has been done.
The attachment 10 with a rotating device is configured to be suspended by a chain 7 of a forklift and lifted and lowered along a mast.

The hydraulic motor 11 has hydraulic lines 20a, 20
b, 21a, 21b are connected to the electromagnetic control valve 22, and by the hydraulic switching operation of the electromagnetic control valve 22, pressure oil sent from a hydraulic pump (not shown) is transferred to the hydraulic motor 1.
1 and the hydraulic motor 11 operates. It should be noted that the hydraulic pipeline 2 is moved according to the elevation of the attachment 10 with the rotating device.
0a and 21a are paid out or wound up from the hose reel 23 to prevent the hydraulic pipe lines 20a and 21a from slackening. The hydraulic lines 20a and 21a are connected to the hydraulic lines 20b and 21b by a junction block 24.

Rotation of the rotor 15 to the right or left is performed by tilting the attachment lever 25 to the right or left. That is, when the lever 25 is tilted to the right from the neutral position, the controller 26 outputs the right rotation signal SR and the electromagnetic control valve 2
2 sends pressure oil to the hydraulic motor 11 so as to rotate the rotor 15 to the right. When the lever 25 is tilted to the left from the neutral position, the controller 26 outputs a left rotation signal SL,
The electromagnetic control valve 22 sends pressure oil to the hydraulic motor 11 so as to rotate the rotor 15 counterclockwise.

The angular position detection switch SW1 composed of a micro switch is installed near the rotor 15. Then, when the rotational position of the rotor 15 is located at a position where the work mechanism 19 can properly handle the cargo, the switch S
W1 is turned on and sends the angle signal SA to the controller 26. Further, the controller 26 has a control stop switch SW
2 and the notification lamp 30 are connected. Notification lamp 3
0 is installed at a position that is easy for the operator to see. The attachment lever 25 outputs a right rotation command LR when tilted right, and outputs a left rotation command LL when tilted left.

The controller 26 has a CPU 41 as a main component, and an A / D converter 42 for guiding the commands LL and LR from the attachment lever 25 to the CPU 41.
A switch input interface 43 for guiding the signals of the switches SW1 and SW2 to the CPU 41, and a RAM 4 serving as a memory.
4, ROM 45, power supply circuit 46 that receives power from the battery 50, solenoid valve drive circuit 47 that sends rotation signals SR and SL to the solenoid control valve 22 based on a command from the CPU 41, CPU
It is composed of an output driver 48 for turning on the notification lamp 30 based on a command from 48, a clock 49 and the like.

In this device, the attachment lever 25
Is tilted to the right and a right rotation command LL is issued, the controller 26 sends a right rotation signal SR to the electromagnetic control valve 22 to send pressure oil to the hydraulic motor 11 so as to rotate the rotor 15 and the working mechanism 19 to the right. To be done. On the other hand, when the attachment lever 25 is tilted to the left and the left rotation command LR is issued, the controller 26 sends a left rotation signal SL to the electromagnetic control valve 22 to rotate the rotor 15 and the working mechanism 19 counterclockwise. The pressure oil is delivered to.

Further, in this apparatus, when the rotating position of the rotor 15 of the rotating device 16 is located at a position where the work mechanism 19 can carry out an appropriate cargo handling, the angular position detection switch SW1
Outputs an angle signal SA. At this time, if the control stop switch SW2 is OFF, the controller 2
6 drives the output driver 48 to turn on the notification lamp 30. Therefore, if the worker performs the cargo handling work when the notification lamp 30 is turned on, the worker can properly carry out the cargo handling without causing damage to the luggage. In addition, since it is not necessary to check the rotation position by oneself, work efficiency is improved.

FIG. 3 shows a control operation for turning on / off the notification lamp 30. As shown in the figure, initialization is performed in step 1, and the control stop switch SW2 is turned off in step 2.
Determine if N. If the switch SW2 is ON, the notification lamp 30 is turned off (step 3). If the switch SW2 is OFF, the process proceeds to step 4, and it is determined whether the angular position detection switch SW1 is ON. If the switch SW1 is ON, the notification lamp 30 is turned on (step 5), and if the switch SW1 is OFF, the notification lamp 30 is turned off.

Although the notification lamp is used as the notification device in the above embodiment, other notification means may be used. For example, it may be displayed in characters or may be announced by voice.

[0021]

According to the present invention, as will be described in detail with reference to the embodiments, the operator is visually informed of the rotational position because a notification is given when the rotational position is reached in which proper cargo handling can be performed. If there is no need and cargo is handled when there is a notice, cargo handling can be done safely and appropriately.

[Brief description of drawings]

FIG. 1 is a block diagram showing a control system according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a control system, a hydraulic circuit, and the like according to an embodiment.

FIG. 3 is a flowchart showing the operation of the embodiment.

FIG. 4 is a perspective view showing a forklift.

FIG. 5 is a configuration diagram showing a lifting unit of a forklift.

[Explanation of symbols]

 1 Lift Cylinder 1a Piston Rod 2 Outer Mast 3 Inner Mast 4 Car Body 5 Bracket 6 Fork 7 Chain 8 Chain Wheel 10 Attachment with Rotating Device 11 Hydraulic Motor 12 Worm 13 Worm Wheel 14 Spur Gear 15 Rotor 16 Rotating Device 19 Working Mechanism 20a, 20b , 21a, 21b Hydraulic line 22 Electromagnetic control valve 23 Hose reel 24 Junction block 25 Attachment lever 26 Controller 30 Notification lamp 50 Battery SW1 Angular position detection switch SW2 Control stop switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Matsuda 3000 Tana, Sagamihara-shi, Kanagawa Mitsubishi Heavy Industries, Ltd. Sagamihara Works (72) Inventor Toshiyuki Midorikawa 3000, Tana, Sagamihara, Kanagawa Eye Sagami High-Tech Co., Ltd. (72) Inventor Tsuruji Kitabayashi 3000 Tana, Sagamihara-shi, Kanagawa M-E-I Sagami Hi-Tech Co., Ltd.

Claims (1)

[Claims] 1. An attachment with a rotating device for a forklift, comprising: a rotating device having a rotating portion that moves up and down on a front surface of a vehicle body and is rotated by supply of pressure oil; and a working mechanism provided on the rotating portion. An attachment lever that is tilted to the right from the position or tilted to the left, an electromagnetic control valve that switches the supply direction of the pressure oil that is supplied to the rotating device to change the rotation direction of the rotating portion, and the work mechanism that is more appropriate. Angle position detection switch that detects that the rotation position of the rotating portion is located at a position where various loading and unloading operations are possible, notification means that notifies the operator that loading is possible, and when the attachment lever tilts to the right, The direction of pressure oil supply by the solenoid control valve is controlled so that the rotating part rotates to the right, and when the attachment lever tilts to the left, A controller for controlling the pressure oil supply direction by the electromagnetic control valve so that the rotating portion rotates counterclockwise, and for activating the notification means when detecting that the angular position detection switch has reached an appropriate cargo handling position. An attachment mechanism with a rotating device in a forklift, which is characterized in that