JPH0620797Y2 - Rotating device for rotating attachment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rotating device for a rotary attachment such as a roll clamp of a forklift and a rotary fork.

[Conventional technology]

In the work using the rotary attachment, for example, in the roll clamp, most of the work is performed in the horizontal and vertical positions, such as holding the roll paper vertically and horizontally, and the rotating fork, fork horizontal and vertical.

[Problems to be solved by the invention]

Therefore, it takes time and the work efficiency is poor because it is adjusted to the horizontal and vertical positions by the fine operation of the operation lever, and if the deviation from the horizontal and vertical positions is large, the luggage may be damaged during the work. It was also a cause of excessive fatigue to the driver.

[Purpose of device]

The present invention has been made in view of the above circumstances, and its purpose is to operate the operation lever only and rotate it to a horizontal or vertical rotational position (or an arbitrarily set rotational position) without fine operation. It is to provide a rotation device of a rotation attachment that can be stopped.

[Means and Actions for Solving Problems]

In a rotation device of a rotary attachment, a lift bracket 2 is provided so as to be movable up and down along a mast 1 attached to a front portion of a vehicle body, and a rotary body 7 of a rotary attachment is rotatably attached to the lift bracket 2 by a hydraulic motor 3. The rotary body 7 is provided with four or more detection bodies at predetermined angular positions in the rotational direction, and the lift bracket 2 is provided with:
A stop sensor 21 and a start sensor 22 that are turned on in contact with the respective detection bodies are attached at positions displaced from each other in the rotation direction of the rotating body by an angle position smaller than the predetermined angle, and an operation valve 10 that supplies the hydraulic fluid discharged from the hydraulic pump 13 to the hydraulic motor 3. The operating lever 11 is used to switch between a neutral position a, a left rotation position b, and a right rotation position c.
0 and the hydraulic motor 3 are provided with an electromagnetic switching valve 12 which is held in the open position d by a spring force and which is in the closed position e when the solenoid 12a is energized, and when the operation valve 10 is in the left rotation position b. A left rotation sensor 23 that turns on and a right rotation sensor 24 that turns on at the right rotation position c are provided, and a controller 30 that energizes the solenoid 12a of the electromagnetic switching valve 12 is connected to the battery 2 via the main switch 20.
5, the controller 30 is turned on by turning on the left rotation sensor 23 and the right rotation sensor 24, and the first relay switch 31 is turned on to energize between the contacts and the first relay switch 31.
The second state, in which the power is applied between the contacts depending on the ON state of the
Relay switch 33, a third relay switch 32 having a self-holding function of energizing between contacts when the second relay switch 33 is in the ON state and the start sensor 22 is in the ON state, and the first relay The switch 31 and the third relay switch 32 are in the ON state, and when the stop switch 21 is in the ON state, the solenoid 12a of the electromagnetic switching valve 12 is energized when the stop switch 21 is ON. Rotating device for rotating attachments.

[Action]

As a result, when the operation lever 11 is operated to switch the operation valve 10 to the left rotation position b or the right rotation position c, the rotary attachment rotates, and when the stop sensor 21 detects the next detection object and turns it on, electromagnetic switching is performed. Since the valve 12 becomes the closed position e and the hydraulic motor 3 stops, the rotary attachment also stops. Therefore, it is not necessary to operate the operation lever 11 when stopping the rotary attachment. It can be automatically stopped when it rotates, and the rotary attachment can be accurately stopped at a predetermined rotation position.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to the illustrated embodiments. The present embodiment is an example in which the rotation is stopped every 90 degrees in the horizontal and vertical directions, and it is possible to easily set an arbitrary angle.

In FIG. 1, a lift bracket 2 is attached so as to be able to move up and down along a mast 1 attached to the vehicle front portion of a forklift. The outer race 5 of the swivel bearing A is fixed to the front portion of the front plate 2a of the lift bracket 2 with bolts 71, and the inner race 6 is fixed to the rotating body 7 with bolts 72. In the case of a rotary fork, a fingerboard and a fork (not shown) are attached to the front part of the rotary body 7, and in the case of a roll clamp, a clamp frame (not shown) is fixed to the inner race 6 instead of the rotary body 7. It In the present embodiment, the rotating body 7 including the clamp frame is used.

A hydraulic motor 3 is provided at the rear of the front plate 2a of the lift bracket 2.
Is provided, and the gear 4 mounted on the tip of the drive shaft 3a meshes with a tooth portion 6'formed on the inner circumference of the inner race 6 to rotate the inner race 6 and the rotating body 7.

As shown in FIG. 2 and FIG. 3, a detection body 8 is provided on the rear portion of the rotary body 7 so as to project at 8a, 8b, 8c, and 8d on the circumference of a circle.

The stop sensor 21 and the start sensor 22 are each attached to a support member 73 fixed to the front plate 2a of the lift bracket 2, and the angle θ when the stop sensor 21 and the start sensor 22 are attached is shown in FIG. As described above, the radii l ₁ and l ₂ are set to be less than 90 degrees, and the radii l ₁ and l ₂ of the respective radii l ₁ and l ₂ are the same as the radius l ₃ of the circle formed by the detection bodies 8 a, 8 b, 8 c, and 8 d protruding from the rotating body 7. Further, the operation valve 10 for supplying the hydraulic fluid discharged from the pump 13 to the hydraulic motor 3 is switched to the neutral position a, the left rotation position b, and the right rotation position c by the operation lever 11.
0 and the hydraulic motor 3 are provided with an electromagnetic switching valve 12, which is held in an open position d by a spring force, and when the solenoid 12a is energized, it is in a closed position e and faces the operating lever 11. And the operation valve 10 is rotated to the left b
There is provided a left rotation sensor 23 which is turned on at the time of and a right rotation sensor 24 which is turned on at the right rotation position c. Each sensor 2
Solenoid switching valve 1 based on the output signals of 1, 22, 23, 24
The main switch 20 is provided between the controller 30 that controls the control unit 2 and the battery 25. FIG. 5 is an electric circuit diagram, in which the controller 30 is replaced by relay switches 31, 32,
It is shown within a chain line including 33 and 34.

The stop sensor 21 and the start sensor 22 are the detection body 8
It is provided so that it is turned on when it is rotated to the position.

Next, the operation will be described.

In the state shown in FIG. 4 (that is, the stop sensor 21 is ON and the start sensor 22 is OFF), the main switch 20 is turned ON and the operation lever 11 is operated in the counterclockwise rotation direction.

The left rotation sensor 23 is turned on, the relay switch 31 is excited, and the contact points 41-61 and 42-62 are energized. Therefore, the relay switch 33 is excited and the contact point 43-
51 is energized. However, the start sensor 22 is OFF
Therefore, the relay switches 32 and 34 are not excited and the electromagnetic switching valve 12 remains in the open position d shown in FIG.

Therefore, the hydraulic pressure sent from the pump 13 is supplied from the operation valve 10 to the hydraulic motor 3 through the electromagnetic switching valve 12, and the rotation of the hydraulic motor 3 causes the rotating body 7 to rotate counterclockwise via the gear 4 and the inner race 6. The detection body 8 projecting from the rotary body 7 also rotates in the direction of the arrow in FIG. After rotating by the angle θ,
The start sensor 22 detects the detection body 8a and turns on.

The relay switch 32 is excited, and the contact point 540-6
3, 55-64 is energized, but at this time, the stop sensor 2
Since 1 is OFF, the relay switch 34 is not excited and the electromagnetic switching valve 12 remains in the open position d.

When the rotating body 7 further rotates counterclockwise and the detecting body 8a passes the start switch 22, the start sensor 22 is turned off.
However, since the relay switch 32 maintains the excited state (that is, has a self-holding function) because the contacts 54-63 are energized, the contacts 55-64 are also energized. When the stop sensor 21 further rotates counterclockwise and detects the detection body 8b and turns on, the relay switches 31, 32, 3
Since 3 is in the excited state, when the stop sensor 21 is turned on, the relay switch 34 is excited and the contact point 52-5
3 is energized, the solenoid 12a of the electromagnetic switching valve 12 is energized to operate to the closed position e, and the circuit between the operation valve 10 and the hydraulic motor 3 is cut off, so that the rotation is stopped. Therefore, the detection body 8a is rotated by the angle of the detection body 8b, that is, 90 °, and stopped. The detection body 8a is placed at a vertical position, and the detection body 8b
If is installed in a horizontal position, it will rotate left from vertical and stop horizontally.

When the operation lever 11 is returned to the neutral state after the rotation is stopped, the left rotation sensor 23 is turned off and the relay switch 31 is deenergized, so that the relay switch 33 is deenergized.
Subsequently, the relay switches 32 and 34 are also released, the contacts 52-53 are de-energized, the solenoid 12a of the electromagnetic switching valve 12 is de-energized, and the state of the open position d shown in FIG. 4 is returned by the spring force. Even if the operating lever 11 is further operated to rotate rightward or leftward, it is possible to rotate by 90 degrees and stop as in the above-described operation.

Further, when the main switch 20 is turned off, the controller 30 does not operate, and the operation is exactly the same as the operation of the conventional rotating device.

[Effect of device]

The operation lever 11 is operated to move the operation valve 10 to the left rotation position b,
Alternatively, the rotation attachment rotates by switching to the right rotation position c, and the stop sensor 21 detects the next detection object and turns on.
Then, the electromagnetic switching valve 12 becomes the closed position e and the hydraulic motor 3
Stops, so the rotary attachment also stops.

Therefore, since it is not necessary to operate the operation lever 11 when stopping the rotary attachment, the rotary attachment can be automatically stopped when the rotary attachment rotates by the mounting angle of the detection body, and the rotary attachment can be accurately stopped at a predetermined rotation position.

Further, the number of detection bodies is four or more, and the left / right rotation sensor 2
3, 24, a stop sensor 21, and a start sensor 22 are provided, and four relay switches are activated by turning these sensors ON and OFF to operate the solenoid 12a of the electromagnetic switching valve 12.
Since the controller 30 for controlling energization is provided in the above, even when the rotary attachment is rotated to the right or left, it can be correctly stopped at the predetermined rotation position, and the controller 30 is simple and the cost can be reduced.

Further, the controller 30 is connected to the battery 25 via the main switch 20, and the electromagnetic switching valve 12 is held in the open position d by the spring force.
By turning OFF, the electromagnetic switching valve 12 is opened to the open position d by the spring force irrespective of the rotational position of the rotary attachment, and by switching the operation valve 10 by the operation lever 11, the rotary attachment can be arbitrarily rotated to perform normal work.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a rotating device, FIG. 2 is a front view of a rotating body, and FIG.
FIG. 4 is a hydraulic circuit, an electric circuit diagram, and FIG. 5 is an electric circuit diagram. 1 is a mast, 2 is a lift bracket, 3 is a hydraulic motor,
5 is an outer race, 6 is an inner race, 7 is a rotating body, 8
Is a detector, 11 is an operation valve lever, 12 is an electromagnetic switching valve, 2
0 is a main switch, 21 is a stop sensor, 22 is a start sensor, 23 is a left rotation sensor, 24 is a right rotation sensor,
30 is a controller.

Claims (1)

[Scope of utility model registration request] 1. A rotary attachment in which a lift bracket 2 is provided so as to be movable up and down along a mast 1 attached to a front portion of a vehicle body, and a rotary body 7 of a rotary attachment is rotatably attached to the lift bracket 2 by a hydraulic motor 3. In the rotating device, the four or more detection bodies are provided on the rotating body 7 at different positions in the rotation direction at predetermined angles, and the lift bracket 2 includes:
A stop sensor 21 and a start sensor 22 that are turned on in contact with the respective detection bodies are attached at positions displaced from each other in the rotation direction of the rotating body by an angle position smaller than the predetermined angle, and an operation valve 10 that supplies the hydraulic fluid discharged from the hydraulic pump 13 to the hydraulic motor 3. The operating lever 11 is used to switch between a neutral position a, a left rotation position b, and a right rotation position c.
0 and the hydraulic motor 3 are provided with an electromagnetic switching valve 12 which is held in the open position d by a spring force and which is in the closed position e when the solenoid 12a is energized, and the operation valve 10 is set to the left rotation position b. A left rotation sensor 23 that is turned on at times and a right rotation sensor 24 that is turned on at the right rotation position c are provided, and a controller 30 that energizes the solenoid 12a of the electromagnetic switching valve 12 is connected to the battery 2 via the main switch 20.
5, the controller 30 is turned on by turning on the left rotation sensor 23 and the right rotation sensor 24, and the first relay switch 31 is turned on to energize between the contacts and the first relay switch 31.
The second state, in which the power is applied between the contacts depending on the ON state of the
Relay switch 33, a third relay switch 32 having a self-holding function of energizing between contacts when the second relay switch 33 is in the ON state and the start sensor 22 is in the ON state, and the first relay The switch 31 and the third relay switch 32 are in the ON state, and when the stop switch 21 is in the ON state, the solenoid 12a of the electromagnetic switching valve 12 is energized when the stop switch 21 is ON. A rotating device for a rotary attachment characterized by the above.