JP2580930B2 - Forklift push-pull device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-pull device for a forklift, and more particularly to a structure for preventing an erroneous operation in a platen moving device.

[0002]

2. Description of the Related Art A push-pull device of a forklift is a device for pulling a load on a platen (fork) when loading a load, and pushing the load along the platen when unloading the load. Such a push-pull device is disclosed in, for example, Japanese Utility Model Laid-Open No. 3-93998, Japanese Utility Model Publication No. 57-2880, and Japanese Utility Model Application Laid-Open No. Sho 62-157796. As shown in FIGS. 5 to 8, the push-pull device includes a mast (reference numeral 9 in FIG.
1) Fork frame 92 mounted to be able to move up and down
And a pair of left and right platens 94 movably provided in the lower part of the fork frame 92.

[0003] Above the platen 94, there is provided a face plate 95 which moves in the front-rear direction, and a pantograph 96 is provided between the face plate 95 and the fork frame 92 so as to be stretchable in the front-rear direction. Having. Above the platen 94, the platen 9
A retainer 97 that can move up and down, which comes into contact with or separates from 4, is provided on the retainer lift 98. Also, fork frame 9
2 has a platen moving device 8 for moving the pair of platens 94 right and left.

The pantograph 96 has a push-pull cylinder 961 for expanding and contracting it in the front-rear direction.
It is interposed between the fork frame 92. As shown in FIGS. 5 and 6, the retainer elevator 98 includes a hydraulic cylinder 981, a piston rod 982, and a connecting rod 9.
83 The retainer 97 has a retainer rubber plate 971 on its lower surface for sandwiching the sheet pallet 60 with the platen 94. The retainer 97 is used to hold the sheet pallet 60 when the load 70 is pushed out by the face plate 95 while leaving the sheet pallet 60 on the platen 94. The retainer 97 is moved up and down by the hydraulic cylinder 981 (FIG. 7, arrow S, dashed line 97).

[0005] Further, the platen moving device 8 is shown in FIGS.
As shown in FIG. 7, it is disposed between a holder 924 provided on the fork frame 92 and a bearing 941 provided above the platen 94. That is, the platen moving device 8
Screw rod 82 and handle engaging end 8 provided at its tip
1 and a handle 86. The base 83 of the screw rod 82 is rotatably supported by a bearing 925 provided on the holder 924. When the screw rod 82 is rotated, the bearing 941 of the platen 94
A screw groove is provided so that the platen 94 can move left and right. Therefore, when the base 861 of the handle 86 is engaged with the handle engagement end 81 and rotated, the bearing 941 moves left and right, and the platen 94 moves left and right (arrow T in FIG. ).

Next, the face plate 95 is shown in FIGS.
As shown in the figure, a grip portion 7 for gripping the sheet pallet 60 is provided at a lower portion thereof. The grip part 7 has a gripper jaw 74 and a gripper 73 provided on the upper part so as to be able to move up and down. The gripper jaws 74 are mounted on the face plate 9.
5 is fixed to the bracket 75 provided. On the other hand, the gripper 73 has a rubber contact plate 731 at its lower portion for holding the sheet pallet 60 between the gripper jaw 74 and the gripper jaw 74.
Having.

The upper shaft 732 of the gripper 73 penetrates the bracket 75 and is connected to a gripper cylinder (reference numeral 42 in FIG. 8). The gripper 73 and the gripper jaw 74 are connected to each other by a face plate 95.
When pushing out the load 70 together with the sheet pallet 60, the sheet pallet 60 is held. In FIG. 5, reference numeral 99 denotes a lift bracket. In FIG. 6, reference numeral 923 denotes a platen guide, 94
3 is a platen back plate.

The hydraulic cylinder 981 (FIG. 5) of the retainer elevator 98 is operated by a hydraulic circuit shown in FIG. In the hydraulic circuit, the first spool valve 51 of the oil control valve 5 and the retainer elevator 98 are connected by hydraulic pipes 511, 512, a switching solenoid valve 44, and a pilot check valve 45. The retainer 97 is connected to the retainer elevator 98 as described above. The gripper cylinder 42 is further connected to the hydraulic pipes 511 and 512. Further, a push-pull cylinder 961 is connected to the switching electromagnetic valve 44 via a sequence valve 46. On the other hand, the second spool valve 52 of the oil control valve 5 is connected to the side shift cylinder 41 via hydraulic pipes 522 and 523.
Is connected. The details will be described in an embodiment of the present invention described later.

[0009]

The push-pull device has the following problems. That is, first, it is necessary to change the horizontal distance between the pair of platens 94 in accordance with the size of the baggage 70 such as a rice bag or a fertilizer bag. At this time, as shown in FIG. 7, in the platen moving device 8, the engaging portion 861 of the handle 86 is engaged with the handle engaging end 81 of the screw rod 82, and the handle 86 is turned. As a result, the pair of platens 94 move left and right (arrow T), and the distance therebetween is adjusted.

However, as shown by a solid line in FIG.
If the retainer rubber plate 971 of the retainer 97 is kept in contact with the upper surface of the platen 94 at the time of adjusting the distance between the platens, the platen 94 is strongly rubbed by the lateral movement of the platen 94. For this reason, the adjustment of the interval between the platens 94 cannot be performed smoothly. Also, if the handle 86 is turned too much, the retainer 97 may be twisted and damaged. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a push-pull device for a forklift, which can smoothly adjust a distance between platens and does not cause damage to a retainer.

[0011]

According to the present invention, there is provided a fork frame mounted on a mast in front of a vehicle so as to be able to move up and down, a plurality of platens provided at a lower portion of the fork frame so as to be able to move left and right, and a pantograph for moving a pantograph above the platen. And a face plate which is moved to the platen. A liftable retainer which comes into contact with or separates from the platen is attached to the retainer elevator above the platen, and a detachable driving tool is mounted thereon to mount the platen. A platen moving device for moving the right and left is provided on the fork frame,
In a push-pull device provided with an oil control valve for operating a retainer elevator, a drive sensor for detecting that the drive is mounted is provided on the platen moving device, and the oil control valve and the retainer are provided. A solenoid valve which is operated by a signal from the driving tool sensor is provided between the elevator and the elevator, and when the driving tool is mounted, the solenoid valve is operated and the retainer is raised by the retainer lifting device. And a push-pull device for a forklift. It is most remarkable in the present invention that the platen moving device is provided with a driver sensor for detecting the mounting of the driver and the solenoid valve, and the retainer is raised by a signal from the driver sensor. It has been configured.

As the driving tool, there is a handle or the like shown in the conventional example. The driving tool sensor is a sensor for detecting when the driving tool is mounted on the platen moving device and sending a mounting signal to the solenoid valve. Examples of such a driving tool sensor include a limit switch, an optical sensor, and an electromagnetic sensor described in the embodiment.
The solenoid valve is connected between the oil control valve for operating a retainer elevator and the like and the retainer elevator. Then, when the mounting signal is input, the operating oil is sent to the retainer elevator to raise the retainer.

[0013]

In the push-pull device for a forklift according to the present invention, the driver sensor is provided on the platen moving device, and a solenoid valve for raising the retainer by a signal from the driver sensor is provided. For this reason, when a driver is mounted on the platen moving device in adjusting the platen interval, the driver sensor detects this. Then, a mounting signal is sent from the driver sensor to the solenoid valve. Then, the solenoid valve is operated, and the hydraulic oil is sent to the retainer elevator to automatically raise the retainer.

Then, the platen moving device is driven by the driving tool to perform the operation of moving the platen left and right. Therefore, when the platen is moved, the retainer is always separated from the platen, and the retainer is not damaged during the above operation. As described above, according to the present invention, it is possible to provide a push-pull device for a forklift that can smoothly adjust the interval between the platens and does not damage the retainer.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A push-pull device of a forklift according to an embodiment of the present invention will be described with reference to FIGS. This example includes a fork frame 92 mounted on a mast 91 in front of the forklift 9 so as to be able to move up and down, and a pair of platens 94 (see FIG. 5) provided at the lower part of the fork frame 92 so as to be movable left and right. In addition, platen 94
And a pantograph 96 which is disposed between the face plate 95 and the fork frame 92 so as to be extendable and contractible.

Further, as shown in FIG.
Above 4, there is a vertically movable retainer 97 that contacts or separates from the platen 94. The retainer 97 is attached to a connecting rod 983 of a retainer elevator 98 (FIGS. 2 to 4). The fork frame 92 is provided with a platen moving device 8 for moving the platen 94 right and left. The platen moving device 8 is provided with a detachable handle 86 as a driving tool (FIG. 1).
The platen moving device 8 is provided with a driver sensor 1 for detecting that the handle 86 is mounted.

As shown in FIG. 2, a solenoid valve 2 which is activated by a signal from the driver sensor 1 is provided between the retainer elevator 98 and the oil control valve 5. The driver sensor 1 and the solenoid valve 2 are electrically connected. The driving tool sensor 1 includes:
As shown in FIG. 1, the platen moving device 8 is disposed near the driving tool engaging end 81. The driving tool sensor 1 is a limit switch, and the engaging portion 861 of the handle 8
The contact 11 is pressed by the contact. Driver tool 1
Is fixed to the holder 924 of the fork frame 92 via the bracket 12.

Next, as shown in FIG. 2, one end of the solenoid valve 2 is connected to the carry-over port 54 of the oil control valve 5. The solenoid valve 2 and the retainer elevator 98 are connected to the switching electromagnetic valve 4.
4, connected via a pilot check valve 45. The solenoid valve 2 and the switching solenoid valve 44 are connected via hydraulic pipes 511 and 512. The gripper cylinder 42 is connected to the hydraulic pipes 511 and 512 in the same manner as in the conventional example. Further, a push-pull cylinder 961 is connected to the switching electromagnetic valve 44 via a sequence valve 46.

The oil control valve 5 has a first spool valve 51 and a second spool valve 52. The first spool valve 51 includes a retainer elevator 98, a gripper cylinder 4
2. A valve for operating the push-pull cylinder 961. The second spool valve 52 is a valve for operating the side shift cylinder 41, and is a hydraulic pipe 52.
2,523. The oil control valve 5 and the hydraulic oil tank 50 are connected to the hydraulic pipe 5
01, connected via a hydraulic pump 53. Others are the same as the conventional example.

Next, the function and effect will be described. In the push-pull device of this example, the sheet pallet 60 (FIG. 6)
1) between the plantain 94 and the
As shown by the solid line, the retainer 97 is lowered to bring the retainer rubber plate 971 of the retainer 97 into contact with the upper surface of the platen 94. At this time, the platen moving device 8
The handle engaging end 81 of the handle 86
Is not engaged. Further, the contact 11 of the limit switch of the driver sensor 1 is in an open state. As shown in FIG. 2, the solenoid valve 2 is provided with a spool valve so as to connect the carry-over port 54 of the oil control valve 5 and the hydraulic oil tank 50 via the hydraulic pipe 22.

Next, when adjusting the distance between the platens, the handle 8 is attached to the handle engagement end 81 of the platen moving device 8.
The engaging portion 861 of No. 6 is engaged. At this time, the engaging portion 861 pushes the contact 11 of the driver sensor 1. Therefore, the driver sensor 1 is turned on, and the signal is sent to the solenoid valve 2. Then, the solenoid valve 2 is operated, and as shown in FIG. 3, the hydraulic oil sent from the oil control valve 5 flows along the arrow a.

That is, the hydraulic oil is supplied to the hydraulic pipes 24, 51
2, through the switching electromagnetic valve 44 and the pilot check valve 45, enter the hydraulic cylinder 981 of the retainer elevator 98. As a result, the retainer 97 rises. On the other hand, the hydraulic cylinder 981 responds to the flow of the hydraulic oil (arrow a).
3 returns to the solenoid valve 2 through the pilot check valve 45, the switching solenoid valve 44, the hydraulic pipes 511 and 23, and further passes through the hydraulic pipe 22 as indicated by an arrow b in FIG. Return to 50.

When lowering the retainer 97,
As in the conventional case, the first spool valve 51 of the oil control valve 5 is operated to send hydraulic oil to the hydraulic pipe 511. As described above, according to this embodiment, when the handle 86 is engaged with the platen moving device 8, the retainer 97 is automatically set.
Rises. Therefore, the platen 94 and the retainer 97
When the contact is made, the platen moving device is not forcibly operated, and the retainer 97 is not damaged.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a push-pull device according to a first embodiment.

FIG. 2 is an explanatory diagram of a hydraulic circuit of the push-pull device according to the first embodiment when a solenoid valve is not operated.

FIG. 3 is an explanatory diagram of a hydraulic circuit of the push-pull device according to the first embodiment when the retainer is raised.

FIG. 4 is a side view of the forklift and the push-pull device according to the first embodiment.

FIG. 5 is a perspective view of a push-pull device of a forklift in a conventional example.

FIG. 6 is a side view showing the vicinity of a retainer and a platen moving device in a conventional push-pull device.

FIG. 7 is a front view of a main part near a platen moving device in a conventional push-pull device.

FIG. 8 is an explanatory diagram of a hydraulic circuit in a conventional push-pull device.

[Explanation of symbols]

 1. . . Driver sensor, 11. . . Contact, 2. . . 4. solenoid valve, . . Oil control valve, 60. . . 6. sheet pallets, . . Grip part, 70. . . Luggage, 73. . . Gripper, 74. . . 7. gripper jaws, . . Platen moving device, 82. . . Screw rod, 86. . . Handle, 92. . . Fork frame, 94. . . Platen, 95. . . Face plate, 97. . . Retainer, 98. . . Retainer elevator,

Claims (1)

(57) [Claims] 1. A fork frame mounted on a mast in front of a vehicle so as to be able to move up and down, a plurality of platens provided at a lower portion of the fork frame so as to be movable left and right, and a face moved above and below the platen in a front-rear direction by a pantograph. A plate, and a liftable retainer, which comes into contact with or separates from the platen, is attached to the retainer lifter above the platen, and the platen is moved left and right by mounting a detachable driving tool. A push-pull device provided with the platen moving device on the fork frame and an oil control valve for operating a retainer elevator, wherein a driving device sensor for detecting that the driving device is mounted on the platen moving device. Is installed between the oil control valve and the retainer elevator. A push-pull for a forklift, wherein a solenoid valve operated by a signal from a driver sensor is provided, and when the driver is mounted, the solenoid valve is operated to raise the retainer by a retainer elevator. apparatus.