JP2008150176A - Spreader device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost by simplifying structure in a spreader device mounted on a load handling vehicle such as a forklift truck and used to transport a container. <P>SOLUTION: This spreader device comprises a spreader support body 2, a spreader 3, a twist lock 4, a guide 5, a hydraulic motor 6, a motor control valve 7, and a free slewing selector means. In particular, the spreader device comprises the hydraulic motor 6 for slewing the spreader 3, a motor control valve 7 for rotating the hydraulic motor 6 in the forward and reverse directions and stopping it, a free slewing selector means for freely slewing the hydraulic motor 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a spreader device that is mounted on a cargo handling vehicle such as a forklift and is used when a container is transported, and more particularly to an improvement in aligning a twist lock of a spreader with a suspension hole of a container.

  Conventionally, as this kind of spreader device, for example, the one described in Patent Document 1 is known.

JP-A-1-187198

  However, in such a case, it is necessary to provide a spring in the tail chamber of the fluid pressure cylinder or to form a passage with a check valve in the piston, so that the structure is complicated and the cost is high. .

  The present invention has been devised in view of the problems described above, and a problem to be solved by the present invention is to provide a spreader device capable of simplifying the structure and reducing the cost. is there.

  The spreader device of the present invention is basically provided in a spreader support, a spreader supported by the spreader support, capable of moving back and forth, moving up and down, moving left and right and turning about a vertical axis. The twist lock that can be engaged with the suspension hole of the container, the left and right guides that are provided on the spreader and can be brought into contact with the rear surface in the front-rear direction of the container, the fluid pressure motor for turning the spreader, and the fluid pressure motor It is characterized by comprising a motor control valve for reversely rotating and stopping and a free turning switching means for freely turning the fluid pressure motor.

The spreader is supported by the spreader support and is moved back and forth, up and down, and left and right. When the fluid pressure motor is rotated forward or backward by the motor control valve, the spreader is turned or stopped with respect to the spreader support.
When aligning the twist lock of the spreader and the suspension hole of the container, first, the fluid pressure motor is brought into a freely swivelable state by the free swivel switching means. Next, the spreader is moved forward. Then, either one of the left and right guides is brought into contact with the rear surface in the front-rear direction of the container, and the fluid pressure motor can freely rotate, so that the spreader supports the spreader until the other guide comes into contact with the rear surface of the container It is turned with respect to the body.
When the left and right guides are brought into contact with the rear surface of the container, the spreader and the container are arranged in a parallel state, so that the spreader is moved left and right until the spreader twist lock and the container's suspension hole coincide with each other.

  The free swivel switching means is provided between the fluid pressure motor and the motor control valve and has a communication position for communicating the fluid pressure motor side and the motor control valve side, and a free swivel position for communicating only the fluid pressure motor side. It is preferable to use a switching valve provided. In this way, it is only necessary to add a switching valve without significantly changing the fluid pressure circuit.

  The free swivel switching means is preferably constituted by a motor control valve having a free swivel position that allows only the fluid pressure motor sides to communicate with each other. In this way, it is only necessary to change the motor control valve without greatly changing the fluid pressure circuit, and the operation can be simplified.

According to the present invention, the following excellent effects can be achieved.
(1) Consists of a spreader support, spreader, twist lock, guide, fluid pressure motor, motor control valve, and free swivel switching means. In particular, the fluid pressure motor for swiveling the spreader and the fluid pressure motor are forward / reverse. Since the motor control valve for rotating and stopping and the free turning switching means for freely turning the fluid pressure motor are provided, the structure can be simplified and the cost can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a spreader device according to a first example of the present invention. FIG. 2 is a side view of FIG. FIG. 3 is a fluid pressure circuit diagram. FIG. 4 is a plan view for explaining the operation. FIG. 5 is a view similar to FIG.

  The spreader device 1 is composed of a spreader support 2, a spreader 3, a twist lock 4, a guide 5, a fluid pressure motor 6, a motor control valve 7, and a free swivel switching means 8, and is used for cargo handling such as a forklift. Applies to vehicles.

The spreader support 2 forms a basic part of the spreader device 1. In this example, the spreader support 2 has a horizontal plate shape and is not shown, but is provided on the body of the forklift via a lifting device and a side shift device. . In other words, an elevating device (mast device) is provided on the front side of the body of a self-propelled forklift so that it can be tilted back and forth by a front / rear tilt device (tilt device) and can be moved up and down in the vertical direction The elevating body is provided with a side shift device, and the spreader support 2 is provided on a laterally movable body movable in the left-right direction of the side shift device.
Thus, the spreader support 2 can be moved in the front-rear direction (left-right direction in FIG. 2, the same applies hereinafter) depending on the self-propelling of the cargo handling vehicle, and can be moved in the vertical direction depending on the lifting device. It can be moved in the left-right direction depending on the side shift device.

  The spreader 3 is supported by the spreader support 2 and can be moved back and forth, up and down, left and right and swiveled around the vertical axis. In this example, the spreader 3 has a size corresponding to the upper surface of the container A. It has a substantially plane H shape and includes a central plate 9 that is long in the left-right direction and left and right side members 10 that are provided on both sides of the central plate 9 and are long in the front-rear direction.

  The twist lock 4 is provided in the spreader 3 and can be engaged with the suspension hole B of the container A. In this example, the twist lock 4 is provided so as to be pivotable around the vertical axis at the four corners of the spreader 3, A lock position that is rotated by a twist lock cylinder (not shown) to engage with the suspension holes B formed at the four corners of the container A and an unlock position in which the engagement with the suspension holes B is released can be taken. It has become.

  The guides 5 are provided on the spreader 3 and can be matched with the rear surface of the container A in the front-rear direction. In this example, the guide 5 is in the form of a vertically long plate, and the twist lock on the rear side of the spreader 3 is provided. 4 is hung near the rear of 4.

  The fluid pressure motor 6 is for turning the spreader 3. In this example, the fluid pressure motor 6 is provided between the center of the spreader 3 and the spreader support 2.

  The motor control valve 7 is used to rotate and stop the fluid pressure motor 6 in the forward and reverse directions. In this example, a closed center type four-port three-position electromagnetic switching valve is used. Position 12 and stop position 13 are provided. Thus, the primary port of the motor control valve 7 is connected to the pump 16 and the tank 17 by the pipes 14 and 15, and the secondary port is connected to the fluid pressure motor 6 by the pipes 18 and 19. Connected to each.

The free rotation switching means 8 is for freely rotating the fluid pressure motor 6. In this example, the free rotation switching means 8 is provided between the fluid pressure motor 6 and the motor control valve 7, and is provided between the fluid pressure motor 6 side and the motor control valve 7. The switching valve 22 includes a communication position 20 that communicates with the fluid pressure motor 6 and a free rotation position 21 that communicates with only the fluid pressure motor 6 side.
Specifically, the switching valve 22 is interposed in pipes 18 and 19 between the fluid pressure motor 6 and the motor control valve 7, and is an open tandem center (AB connection) type four-port two-position electromagnetic switching. A valve is used.

Next, the operation will be described based on such a configuration.
When the spreader 3 is turned or stopped, as shown in FIG. 3, after the switching valve 22 of the free turning switching means 8 is switched to the communication position 20, the motor control valve 7 is moved to the forward rotation position 11 or the reverse rotation position 12 or stopped. Switch to position 13. Then, the fluid pressure motor 6 is rotated forward or backward or stopped, and the spreader 3 is turned (left-right turned) or stopped with respect to the spreader support 2.

  When positioning the spreader 3 with respect to the container A, first, the switching valve 22 of the free turning switching means 8 is switched to the free turning position 21 so that the fluid pressure motor 6 can freely turn, that is, the external force applied to the fluid pressure motor 6. When it works, put it in a state where it can turn freely.

  Next, the spreader support 2 and the spreader 3 are moved up and down by a lifting device of the cargo handling vehicle so as to keep the guide 5 at a height position where the guide 5 can be brought into contact with the container A. Move 3 forward. At this time, for example, as shown in FIG. 4, if the container A and the spreader 3 are displaced at an angle, the spreader 3 is moved to the spreader support after the one (right) guide 5 is brought into contact with the rear surface of the container A. 2 naturally turns along the container A (turns to the right), and the other (left side) guide 5 also contacts the rear surface of the container A as shown in FIG.

  When the misalignment between the container A and the spreader 3 is corrected, the side shift device is actuated to cause the spreader 3 to be side shifted (moved to the right), so that the twist lock 4 of the spreader 3 and the suspension hole B of the container A are aligned. . At this time, although not shown, for example, the side shift device is stopped by a left-right positioning sensor or the like provided in the spreader 3 so that the twist lock 4 and the suspension hole B are matched to each other.

  When the twist lock 4 and the suspension hole B coincide with each other, the spreader 3 is lowered by the lifting device and the twist lock 4 is inserted into the suspension hole B, and the twist lock 4 is locked by the twist lock cylinder. It is swung to a position to be in a so-called locked state.

  Since the fluid pressure motor 6 for turning the spreader 3 and the free turning switching means 8 for freely turning the fluid pressure motor 6 are provided so that the spreader 3 can freely turn by an external force, the spreader 3 The twist lock 4 and the suspension hole B of the container A can be easily aligned.

Next, a second example of the present invention will be described with reference to FIG.
FIG. 6 is a fluid pressure circuit diagram of the spreader device according to the second example of the present invention.
In the second example, the free turning switching means 8 is different from the first example.
That is, the free turning switching means 8 is configured by the motor control valve 7 having the free turning position 21 that allows only the fluid pressure motor 6 side to communicate with each other.

Specifically, the motor control valve 7 has four positions of a forward rotation position 11, a reverse rotation position 12, a stop position 13, and a free turning position 21, and also serves as the free turning switching means 8.
In such a case, when the motor control valve 7 is switched to the forward rotation position 11, the reverse rotation position 12, or the stop position 13, the fluid pressure motor 6 is rotated forward or reverse, and the spreader 3 is moved relative to the spreader support 2. Turn or stop.
In addition, when the motor control valve 7 is switched to the free swivel position 21, the primary side ports are stopped and the secondary ports are communicated with each other, so that the fluid pressure motor 6 is freed hydraulically. The spreader 3 is brought into a state where it can freely turn.

In the above example, the spreader device 1 is applied to a forklift. However, the present invention is not limited to this. For example, the spreader device 1 may be applied to a crane-type cargo handling vehicle including a crane arm that can be lifted and lowered. In this case, a spreader support 2 is provided at the tip of the crane arm via a swinging device so as to be swingable about a horizontal axis. The spreader support 2 is connected to a swinging body via a swinging device including a fluid pressure motor 6 and the like. Is provided so as to be able to turn around the vertical axis, and a spreader 3 is provided in this turning body so as to be movable in the left-right direction via a side shift device.
In the previous example, the spreader 3 has a substantially planar H shape. However, the spreader 3 is not limited to this, and may be a general planar substantially four-frame shape, for example.
In the previous example, the spreader 3 cannot change the length in the left-right direction. However, the present invention is not limited to this. For example, the spreader 3 may change the length in the left-right direction in accordance with the size of the container A.
Although the fluid pressure motor 6 is provided between the spreader support 2 and the spreader 3 in the previous example, the fluid pressure motor 6 is not limited to this, and may be provided above the spreader support 2, for example.

The perspective view which shows the spreader apparatus which concerns on the 1st example of this invention. The side view of FIG. Fluid pressure circuit diagram. The top view for demonstrating an effect | action. The same figure as FIG. The fluid pressure circuit diagram of the spreader apparatus which concerns on the 2nd example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Spreader apparatus, 2 ... Spreader support body, 3 ... Spreader, 4 ... Twist lock, 5 ... Guide, 6 ... Fluid pressure motor, 7 ... Motor control valve, 8 ... Free swivel switching means, 9 ... Center plate, 10 ... Side material, 11 ... forward rotation position, 12 ... reverse rotation position, 13 ... stop position, 14, 15 ... pipeline, 15 ... pipeline, 16 ... pump, 17 ... tank, 18, 19 ... pipeline, 20 ... communication Position, 21 ... Free swivel position, 22 ... Switching valve, A ... Container, B ... Hanging hole.

Claims (3)

  A spreader support, a spreader supported by the spreader support so as to be able to move back and forth, up and down, to the left and right and turn about the vertical axis; and a twist lock provided on the spreader and capable of engaging with a hanging hole of the container , Left and right guides provided on the spreader that can contact the rear surface of the container in the front-rear direction, a fluid pressure motor for turning the spreader, a motor control valve for rotating and stopping the fluid pressure motor forward and backward, A spreader device comprising: a free turning switching means for freely turning a fluid pressure motor.   The free swivel switching means is provided between the fluid pressure motor and the motor control valve and has a communication position for communicating the fluid pressure motor side and the motor control valve side, and a free swivel position for communicating only the fluid pressure motor side. The spreader device according to claim 1, wherein the spreader device is constituted by a switching valve provided.   2. The spreader device according to claim 1, wherein the free swivel switching means is constituted by a motor control valve having a free swivel position in which only the fluid pressure motor sides communicate with each other.

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