JPS6331993A - Director for direction of turn-over of bucket - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device for detecting irregular winding of a hoisting wire for lifting and lowering a bucket in a crane with a bucket to detect the rolling direction of the bucket. It is.

[Conventional technology and its problems]

In a crane with a bucket, the grab bucket is raised and lowered and opened/closed using a hoisting wire and a bucket opening/closing wire. The hoisting wire is then wound around a hoisting drum on the club, and the drum is selectively switched between forward and reverse rotation to raise and lower the grab bucket. Particularly when there are multiple hoisting wires, each wire is accurately wound into the wire winding groove carved on the outer circumferential surface of the same hoisting drum, preventing irregular winding and keeping the bucket horizontal. It is designed to be raised and lowered while doing so. However, when the bucket is raised and lowered, the hoisting wire may come off the wire winding groove and be wound around the hoisting drum.

If the wire winds irregularly in this manner, the club bucket may hang on one side due to damage to the wire and an imbalance in the lengths of the left and right wires. For this reason, a device has been proposed that automatically detects irregular winding of the wire. An example thereof is shown in FIG. This is a method in which a single irregular winding detection rod is arranged on the outer peripheral surface of the winding drum and parallel to the longitudinal axis of the drum, and when irregular winding occurs, this rod is pushed up to detect irregular winding. be.

However, when there are two hoisting wires, this method cannot detect which wire has irregular winding; it only detects the occurrence of irregular winding, and cannot determine the direction in which the bucket is falling; In order to unwind, it is necessary to unwind part of the grab bucket, unwind the irregularly wound part, and then wind it up again.

For this reason, the grasping operation using the bucket is temporarily stopped, which reduces the efficiency of the bucket operation.

The present invention detects which of the multiple hoisting wires has become irregularly wound, determines the direction in which the bucket is falling, moves the crane a little to the side where the bucket is falling, and eliminates the falling of the bucket, allowing bucket work to be carried out. The purpose is to efficiently perform automatic operation of a crane with a bucket.

[Means for solving problems]

One irregular winding detection rod is arranged for each winding wire along the longitudinal axis of the hoisting drum, and this detects which winding wire has irregular winding. The system determines the direction in which the bucket is falling, moves the crane to the side of the fall, and hoists the bucket without causing any disturbance.

〔Example〕

Next, the present invention will be explained based on embodiments shown in the drawings.

In the figure, 1 and 2 are hoisting drums, and both drums 1 and 2 are hoisting drums.
．． The hoisting drum 2 is parallel to the grab and rotatably supported by bearings 3 and 4, and the hoisting drum 1 is selectively driven in forward and reverse directions by a hoisting machine 5. There are two hoisting wires W on the outer periphery of the hoisting drum 1.
,, wire winding fI is separated from the center of this drum into the left end and right end so that W2 can be wound simultaneously.
! Form 11.12. And the hoisting wire W...
W2 is made into a spiral shape and the valley groove 1 is made to prevent irregular winding.
1.12.

A irregular winding detection rod 6.7 is disposed along the longitudinal axis of the winding drum 1. These two rods6.
7 is arranged along the wire winding groove 11.12 of the winding drum l, and both ends of each rod 8.7 of the bracket are swingably provided on the frame F by brackets 61.62 and 71.72. These two rods 6, 7 are arranged as if they were one rod, but their operations are performed separately. A limit switch 9 is installed on the frame F via a mounting plate 8, and when the wire is irregularly wound, when the irregular winding wire is used to push up the irregular winding detection rod 6 or 7, both ends of the rod are supported. The bracket 61 or 71 swings, and the limit switch 9 is operated by the bracket 61 or 71 to detect the occurrence of irregular winding.

The distance between the irregular winding detection rod 6.7 and the outer circumferential surface of the hoisting drum is set to be smaller than the diameter of the winding wires WL and W2, thereby swinging the detection rod at the same time as the irregular winding.

The relationship between the bracket and the limit switch is determined so that the limit switch is operated when the bracket for supporting the irregular winding detection rod oscillates by more than a certain angle.

Further, in the above description, the rod for detecting irregular winding is provided on the hoisting drum, but the rod for detecting irregular winding may be similarly provided on the opening/closing drum side of the separate winch type.

In the device configured as described above, when the bucket is raised and lowered and opened and closed to perform gripping work, the hoisting wire WL or W
When random winding occurs in either wire, as described above, the random winding detection rod on the side where the random winding occurs is swung due to the random winding of the wire. As a result, the limit switch on the side where the random winding has occurred is operated, and it is thereby detected which wire side the random winding has occurred on.

Once the side on which the turbulence occurs is determined, the direction in which the bucket falls can be determined. Move the crane a little to the overturned side of this bucket, and make sure that the hoisting wire W
The wire is wound up so that the wire W2 or W2 is accurately fitted into the wire winding groove 11 or 12. This restores the rolling of the bucket and allows it to be raised and lowered while being held horizontally.

[Effects of the Invention] According to the present invention, since the irregular winding detection rods are separately provided on the left and right sides of the wire winding groove formed in the winding drum and are swingably provided, it is possible to It is possible to detect whether irregular winding (groove skipping) has been detected, and from this the direction of milling of the bucket can be determined.The advantage is that by moving the crane to the side where the bucket is overturned, the bucket can be rolled up without irregular winding. There is.

[Brief explanation of the drawing]

1 is a front view, FIG. 2 is a plan view, FIG. 3 is a side view, FIG. 4 is an explanatory diagram of irregular winding detection, and FIG. 5 is an explanatory diagram of a known example. 1 and 2 are winding drums, 11.12 are wire winding grooves, 3 and 4 are bearings, 5 is a hoisting machine, 61, 62, 71.7
2 is a bracket, 8 is a mounting plate, 9 is a limit switch,
Wl, W2 are hoisting wires, etc. 1' each - Figure 2

Claims (1)

[Claims] In the bucket hoisting drum of a bucket-equipped crane, rods for detecting irregular wire winding are separately provided on the left and right sides of the wire winding groove formed in the hoisting drum so as to be swingable, and each rod is A bucket overturning direction detecting device comprising a detecting means operated by the user.